ABSTRACT
Abstract
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method and apparatus for small data transmission are provided.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)
This application is a continuation application of prior application Ser. No. 17/371,480, filed on Jul. 9, 2021, which claimed based on and claims priority under 35 U.S.C. § 119(a) of a Korean patent application number 10-2020-0087541, filed on Jul. 15, 2020, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.
BACKGROUND
1. Field
The disclosure relates to a wireless communication system. More particularly, the disclosure relates to an apparatus, a method and a system for small data transmission in wireless communication system.
2. Description of Related Art
To meet the demand for wireless data traffic having increased since deployment of fourth generation (4G) communication systems, efforts have been made to develop an improved fifth generation (5G) or pre-5G communication system. The 5G or pre-5G communication system is also called a âBeyond 4G Networkâ or a âPost long term evolution (LTE) Systemâ. The 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, so as to accomplish higher data rates. To decrease propagation loss of the radio waves and increase the transmission distance, the beamforming, massive multiple-input multiple-output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G communication systems. In addition, in 5G communication systems, development for system network improvement is under way based on advanced small cells, cloud Radio Access Networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like. In the 5G system, Hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access technology have been developed.
The Internet, which is a human centered connectivity network where humans generate and consume information, is now evolving to the Internet of Things (IoT) where distributed entities exchange and process information without human intervention. The Internet of Everything (IoE), which is a combination of the IoT technology and the Big Data processing technology through connection with a cloud server, has emerged. As technology elements, such as âsensing technologyâ, âwired/wireless communication and network infrastructureâ, âservice interface technologyâ, and âSecurity technologyâ have been demanded for IoT implementation, a sensor network, a Machine-to-Machine (M2M) communication, Machine Type Communication (MTC), and so forth have been recently researched. Such an IoT environment may provide intelligent Internet technology services that create a new value to human life by collecting and analyzing data generated among connected things. IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing Information Technology (IT) and various industrial applications.
In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as a sensor network, Machine Type Communication (MTC), and Machine-to-Machine (M2M) communication may be implemented by beamforming, MIMO, and array antennas. Application of a cloud Radio Access Network (RAN) as the above-described Big Data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology.
Meanwhile, there have been various studies on small data transmission (SD) in 5G communication system recently.
The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure.
SUMMARY
Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide a communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G).
Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.
In accordance with an aspect of the disclosure, a method performed by a terminal is provided. The method includes receiving, from a base station, a radio resource control (RRC) release message including at least one configured grant uplink resource for a small data transmission (SDT), identifying an uplink carrier among a normal uplink (NUL) or a supplementary uplink (SUL), based on an SDT procedure initiated while the terminal is in an RRC inactive state, identifying a synchronization signal block (SSB) among SSBs associated with configured grant uplink resources for the SDT procedure on the identified uplink carrier, and transmitting, to the base station, uplink data in an uplink grant corresponding to the identified SSB.
In accordance with another aspect of the disclosure, a method performed by a base station is provided. The method includes transmitting, to a terminal, a radio resource control (RRC) release message including at least one configured grant uplink resource for a small data transmission (SDT), and receiving, from the terminal, uplink data in an uplink grant corresponding to a synchronization signal block (SSB), based on an SDT procedure initiated while the terminal is in an RRC inactive state, wherein the SSB is one among a plurality of SSBs associated with configured grant uplink resources for the SDT procedure on an uplink carrier, and wherein the uplink carrier is one among a normal uplink (NUL) or a supplementary uplink (SUL).
In accordance with another aspect of the disclosure, a terminal is provided. The terminal includes a transceiver, and at least one processor configured to receive, from a base station via the transceiver, a radio resource control (RRC) release message including at least one configured grant uplink resource for a small data transmission (SDT), identify an uplink carrier among a normal uplink (NUL) or a supplementary uplink (SUL), based on an SDT procedure initiated while the terminal is in an RRC inactive state, identify a synchronization signal block (SSB) among SSBs associated with configured grant uplink resources for the SDT procedure on the identified uplink carrier, and transmit, to the base station via the transceiver, uplink data in an uplink grant corresponding to the identified SSB.
In accordance with another aspect of the disclosure, a base station is provided. The base station includes a transceiver, and at least one processor configured to transmit, to a terminal via the transceiver, a radio resource control (RRC) release message including at least one configured grant uplink resource for a small data transmission (SDT), and receive, from the terminal via the transceiver, uplink data in an uplink grant corresponding to a synchronization signal block (SSB), based on an SDT procedure initiated while the terminal is in an RRC inactive state, wherein the SSB is one among a plurality of SSBs associated with configured grant uplink resources for the SDT procedure on an uplink carrier, and wherein the uplink carrier is one among a normal uplink (NUL) or a supplementary uplink (SUL).
Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 illustrates an example of small data transmission using pre-configured uplink grant according to an embodiment of the disclosure;
FIG. 2 illustrates an example of association between synchronization signal block and uplink grant according to an embodiment of the disclosure;
FIG. 3 illustrates another example of association between synchronization signal block and uplink grant according to an embodiment of the disclosure;
FIG. 4 illustrates a flow chart for small data transmission using preconfigured uplink resource according to an embodiment of the disclosure;
FIG. 5 illustrates a flow chart for small data transmission using preconfigured uplink resource according to an embodiment of the disclosure;
FIG. 6 illustrates a flow chart for generating medium access control (MAC) protocol data unit (PDU) for small data according to an embodiment of the disclosure;
FIG. 7 illustrates a flow chart for generating MAC PDU for small data transmission according to an embodiment of the disclosure;
FIG. 8 is a block diagram of a terminal according to an embodiment of the disclosure; and
FIG. 9 is a block diagram of a base station according to an embodiment of the disclosure.
Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.
DETAILED DESCRIPTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding, but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the disclosure is provided for illustration purposes only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.
It is to be understood that the singular forms âa,â âan,â and âtheâ include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to âa component surfaceâ includes reference to one or more of such surfaces.
By the term âsubstantiallyâ it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.
It is known to those skilled in the art that blocks of a flowchart (or sequence diagram) and a combination of flowcharts may be represented and executed by computer program instructions. These computer program instructions may be loaded on a processor of a general purpose computer, special purpose computer, or programmable data processing equipment. When the loaded program instructions are executed by the processor, they create a means for carrying out functions described in the flowchart. Because the computer program instructions may be stored in a computer readable memory that is usable in a specialized computer or a programmable data processing equipment, it is also possible to create articles of manufacture that carry out functions described in the flowchart. Because the computer program instructions may be loaded on a computer or a programmable data processing equipment, when executed as processes, they may carry out operations of functions described in the flowchart.
A block of a flowchart may correspond to a module, a segment, or a code containing one or more executable instructions implementing one or more logical functions, or may correspond to a part thereof. In some cases, functions described by blocks may be executed in an order different from the listed order. For example, two blocks listed in sequence may be executed at the same time or executed in reverse order.
In this description, the words âunitâ, âmoduleâ or the like may refer to a software component or hardware component, such as, for example, a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC) capable of carrying out a function or an operation. However, a âunitâ, or the like, is not limited to hardware or software. A unit, or the like, may be configured so as to reside in an addressable storage medium or to drive one or more processors. Units, or the like, may refer to software components, object-oriented software components, class components, task components, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays or variables. A function provided by a component and unit may be a combination of smaller components and units, and may be combined with others to compose larger components and units. Components and units may be configured to drive a device or one or more processors in a secure multimedia card.
Prior to the detailed description, terms or definitions necessary to understand the disclosure are described. However, these terms should be construed in a non-limiting way.
The base station (BS) is an entity communicating with a user equipment (UE) and may be referred to as BS, base transceiver station (BTS), node B (NB), evolved NB (eNB), access point (AP), 5G NB (5GNB), or next generation node B (gNB).
The UE is an entity communicating with a BS and may be referred to as UE, device, mobile station (MS), mobile equipment (ME), or terminal.
In the recent years several broadband wireless technologies have been developed to meet the growing number of broadband subscribers and to provide more and better applications and services. The second generation wireless communication system has been developed to provide voice services while ensuring the mobility of users. Third generation wireless communication system supports not only the voice service but also data service. In recent years, the fourth wireless communication system has been developed to provide high-speed data service. However, currently, the fourth generation wireless communication system suffers from lack of resources to meet the growing demand for high speed data services. So a fifth generation wireless communication system is being developed to meet the growing demand for high speed data services, support ultra-reliability and low latency applications.
The fifth generation wireless communicatio
CROSS-REFERENCE TO RELATED APPLICATION(S)
This application is a continuation application of prior application Ser. No. 17/371,480, filed on Jul. 9, 2021, which claimed based on and claims priority under 35 U.S.C. § 119(a) of a Korean patent application number 10-2020-0087541, filed on Jul. 15, 2020, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.
BACKGROUND
1. Field
The disclosure relates to a wireless communication system. More particularly, the disclosure relates to an apparatus, a method and a system for small data transmission in wireless communication system.
2. Description of Related Art
To meet the demand for wireless data traffic having increased since deployment of fourth generation (4G) communication systems, efforts have been made to develop an improved fifth generation (5G) or pre-5G communication system. The 5G or pre-5G communication system is also called a âBeyond 4G Networkâ or a âPost long term evolution (LTE) Systemâ. The 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, so as to accomplish higher data rates. To decrease propagation loss of the radio waves and increase the transmission distance, the beamforming, massive multiple-input multiple-output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G communication systems. In addition, in 5G communication systems, development for system network improvement is under way based on advanced small cells, cloud Radio Access Networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like. In the 5G system, Hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access technology have been developed.
The Internet, which is a human centered connectivity network where humans generate and consume information, is now evolving to the Internet of Things (IoT) where distributed entities exchange and process information without human intervention. The Internet of Everything (IoE), which is a combination of the IoT technology and the Big Data processing technology through connection with a cloud server, has emerged. As technology elements, such as âsensing technologyâ, âwired/wireless communication and network infrastructureâ, âservice interface technologyâ, and âSecurity technologyâ have been demanded for IoT implementation, a sensor network, a Machine-to-Machine (M2M) communication, Machine Type Communication (MTC), and so forth have been recently researched. Such an IoT environment may provide intelligent Internet technology services that create a new value to human life by collecting and analyzing data generated among connected things. IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing Information Technology (IT) and various industrial applications.
In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as a sensor network, Machine Type Communication (MTC), and Machine-to-Machine (M2M) communication may be implemented by beamforming, MIMO, and array antennas. Application of a cloud Radio Access Network (RAN) as the above-described Big Data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology.
Meanwhile, there have been various studies on small data transmission (SD) in 5G communication system recently.
The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure.
SUMMARY
Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide a communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G).
Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.
In accordance with an aspect of the disclosure, a method performed by a terminal is provided. The method includes receiving, from a base station, a radio resource control (RRC) release message including at least one configured grant uplink resource for a small data transmission (SDT), identifying an uplink carrier among a normal uplink (NUL) or a supplementary uplink (SUL), based on an SDT procedure initiated while the terminal is in an RRC inactive state, identifying a synchronization signal block (SSB) among SSBs associated with configured grant uplink resources for the SDT procedure on the identified uplink carrier, and transmitting, to the base station, uplink data in an uplink grant corresponding to the identified SSB.
In accordance with another aspect of the disclosure, a method performed by a base station is provided. The method includes transmitting, to a terminal, a radio resource control (RRC) release message including at least one configured grant uplink resource for a small data transmission (SDT), and receiving, from the terminal, uplink data in an uplink grant corresponding to a synchronization signal block (SSB), based on an SDT procedure initiated while the terminal is in an RRC inactive state, wherein the SSB is one among a plurality of SSBs associated with configured grant uplink resources for the SDT procedure on an uplink carrier, and wherein the uplink carrier is one among a normal uplink (NUL) or a supplementary uplink (SUL).
In accordance with another aspect of the disclosure, a terminal is provided. The terminal includes a transceiver, and at least one processor configured to receive, from a base station via the transceiver, a radio resource control (RRC) release message including at least one configured grant uplink resource for a small data transmission (SDT), identify an uplink carrier among a normal uplink (NUL) or a supplementary uplink (SUL), based on an SDT procedure initiated while the terminal is in an RRC inactive state, identify a synchronization signal block (SSB) among SSBs associated with configured grant uplink resources for the SDT procedure on the identified uplink carrier, and transmit, to the base station via the transceiver, uplink data in an uplink grant corresponding to the identified SSB.
In accordance with another aspect of the disclosure, a base station is provided. The base station includes a transceiver, and at least one processor configured to transmit, to a terminal via the transceiver, a radio resource control (RRC) release message including at least one configured grant uplink resource for a small data transmission (SDT), and receive, from the terminal via the transceiver, uplink data in an uplink grant corresponding to a synchronization signal block (SSB), based on an SDT procedure initiated while the terminal is in an RRC inactive state, wherein the SSB is one among a plurality of SSBs associated with configured grant uplink resources for the SDT procedure on an uplink carrier, and wherein the uplink carrier is one among a normal uplink (NUL) or a supplementary uplink (SUL).
Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 illustrates an example of small data transmission using pre-configured uplink grant according to an embodiment of the disclosure;
FIG. 2 illustrates an example of association between synchronization signal block and uplink grant according to an embodiment of the disclosure;
FIG. 3 illustrates another example of association between synchronization signal block and uplink grant according to an embodiment of the disclosure;
FIG. 4 illustrates a flow chart for small data transmission using preconfigured uplink resource according to an embodiment of the disclosure;
FIG. 5 illustrates a flow chart for small data transmission using preconfigured uplink resource according to an embodiment of the disclosure;
FIG. 6 illustrates a flow chart for generating medium access control (MAC) protocol data unit (PDU) for small data according to an embodiment of the disclosure;
FIG. 7 illustrates a flow chart for generating MAC PDU for small data transmission according to an embodiment of the disclosure;
FIG. 8 is a block diagram of a terminal according to an embodiment of the disclosure; and
FIG. 9 is a block diagram of a base station according to an embodiment of the disclosure.
Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.
DETAILED DESCRIPTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding, but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the disclosure is provided for illustration purposes only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.
It is to be understood that the singular forms âa,â âan,â and âtheâ include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to âa component surfaceâ includes reference to one or more of such surfaces.
By the term âsubstantiallyâ it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide.
It is known to those skilled in the art that blocks of a flowchart (or sequence diagram) and a combination of flowcharts may be represented and executed by computer program instructions. These computer program instructions may be loaded on a processor of a general purpose computer, special purpose computer, or programmable data processing equipment. When the loaded program instructions are executed by the processor, they create a means for carrying out functions described in the flowchart. Because the computer program instructions may be stored in a computer readable memory that is usable in a specialized computer or a programmable data processing equipment, it is also possible to create articles of manufacture that carry out functions described in the flowchart. Because the computer program instructions may be loaded on a computer or a programmable data processing equipment, when executed as processes, they may carry out operations of functions described in the flowchart.
A block of a flowchart may correspond to a module, a segment, or a code containing one or more executable instructions implementing one or more logical functions, or may correspond to a part thereof. In some cases, functions described by blocks may be executed in an order different from the listed order. For example, two blocks listed in sequence may be executed at the same time or executed in reverse order.
In this description, the words âunitâ, âmoduleâ or the like may refer to a software component or hardware component, such as, for example, a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC) capable of carrying out a function or an operation. However, a âunitâ, or the like, is not limited to hardware or software. A unit, or the like, may be configured so as to reside in an addressable storage medium or to drive one or more processors. Units, or the like, may refer to software components, object-oriented software components, class components, task components, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays or variables. A function provided by a component and unit may be a combination of smaller components and units, and may be combined with others to compose larger components and units. Components and units may be configured to drive a device or one or more processors in a secure multimedia card.
Prior to the detailed description, terms or definitions necessary to understand the disclosure are described. However, these terms should be construed in a non-limiting way.
The base station (BS) is an entity communicating with a user equipment (UE) and may be referred to as BS, base transceiver station (BTS), node B (NB), evolved NB (eNB), access point (AP), 5G NB (5GNB), or next generation node B (gNB).
The UE is an entity communicating with a BS and may be referred to as UE, device, mobile station (MS), mobile equipment (ME), or terminal.
In the recent years several broadband wireless technologies have been developed to meet the growing number of broadband subscribers and to provide more and better applications and services. The second generation wireless communication system has been developed to provide voice services while ensuring the mobility of users. Third generation wireless communication system supports not only the voice service but also data service. In recent years, the fourth wireless communication system has been developed to provide high-speed data service. However, currently, the fourth generation wireless communication system suffers from lack of resources to meet the growing demand for high speed data services. So a fifth generation wireless communication system is being developed to meet the growing demand for high speed data services, support ultra-reliability and low latency applications.
The fifth generation wireless communication system will be implemented not only in lower frequency bands but also in higher frequency (mmWave) bands, e.g., 10 GHz to 100 GHz bands, so as to accomplish higher data rates. To mitigate propagation loss of the radio waves and increase the transmission distance, beamforming, massive Multiple-Input Multiple-Output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, and large scale antenna techniques are being considered in the design of fifth generation wireless communication system. In addition, the fifth generation wireless communication system is expected to address different use cases having quite different requirements in terms of data rate, latency, reliability, mobility etc. However, it is expected that the design of the air-interface of the fifth generation wireless communication system would be flexible enough to serve the UEs having quite different capabilities depending on the use case and market segment the UE cater service to the end customer. Few example use cases the fifth generation wireless communication system wireless system is expected to address is enhanced Mobile Broadband (eMBB), massive Machine Type Communication (m-MTC), ultra-reliable low latency communication (URLL) etc. The eMBB requirements like tens of Gbps data rate, low latency, high mobility so on and so forth address the market segment representing the conventional wireless broadband subscribers needing internet connectivity everywhere, all the time and on the go. The m-MTC requirements like very high connection density, infrequent data transmission, very long battery life, low mobility address so on and so forth address the market segment representing the Internet of Things (IoT)/Internet of Everything (IoE) envisioning connectivity of billions of devices. The URLL requirements like very low latency, very high reliability and variable mobility so on and so forth address the market segment representing the Industrial automation application, vehicle-to-vehicle/vehicle-to-infrastructure communication foreseen as one of the enabler for autonomous cars.
In the fifth generation wireless communication system operating in higher frequency (mmWave) bands, UE and gNB communicates with each other using Beamforming. Beamforming techniques are used to mitigate the propagation path losses and to increase the propagation distance for communication at higher frequency band. Beamforming enhances the transmission and reception performance using a high-gain antenna. Beamforming can be classified into Transmission (TX) beamforming performed in a transmitting end and reception (RX) beamforming performed in a receiving end. In general, the TX beamforming increases directivity by allowing an area in which propagation reaches to be densely located in a specific direction by using a plurality of antennas.
In this situation, aggregation of the plurality of antennas can be referred to as an antenna array, and each antenna included in the array can be referred to as an array element. The antenna array can be configured in various forms such as a linear array, a planar array, etc. The use of the TX beamforming results in the increase in the directivity of a signal, thereby increasing a propagation distance. Further, since the signal is almost not transmitted in a direction other than a directivity direction, a signal interference acting on another receiving end is significantly decreased. The receiving end can perform beamforming on a RX signal by using a RX antenna array. The RX beamforming increases the RX signal strength transmitted in a specific direction by allowing propagation to be concentrated in a specific direction, and excludes a signal transmitted in a direction other than the specific direction from the RX signal, thereby providing an effect of blocking an interference signal.
By using beamforming technique, a transmitter can make plurality of transmit beam patterns of different directions. Each of these transmit beam patterns can be also referred as TX beam. Wireless communication system operating at high frequency uses plurality of narrow TX beams to transmit signals in the cell as each narrow TX beam provides coverage to a part of cell. The narrower the TX beam, higher is the antenna gain and hence the larger the propagation distance of signal transmitted using beamforming. A receiver can also make plurality of RX beam patterns of different directions. Each of these receive patterns can be also referred as RX beam.
The fifth generation wireless communication system (also referred as next generation radio or NR), supports standalone mode of operation as well dual connectivity (DC). In DC a multiple Rx/Tx UE may be configured to utilize resources provided by two different nodes (or NBs) connected via non-ideal backhaul. One node acts as the Master Node (MN) and the other as the Secondary Node (SN). The MN and SN are connected via a network interface and at least the MN is connected to the core network. NR also supports Multi-RAT Dual Connectivity (MR-DC) operation whereby a UE in radio resource control connected (RRC_CONNECTED) is configured to utilize radio resources provided by two distinct schedulers, located in two different nodes connected via a non-ideal backhaul and providing either E-UTRA (Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access) (i.e., if the node is an ng-eNB) or NR access (i.e., if the node is a gNB). In NR for a UE in RRC_CONNECTED not configured with carrier aggregation (CA)/DC there is only one serving cell comprising of the primary cell. For a UE in RRC_CONNECTED configured with CA/DC the term âserving cellsâ is used to denote the set of cells comprising of the Special Cell(s) and all secondary cells. In NR the term Master Cell Group (MCG) refers to a group of serving cells associated with the Master Node, comprising the Primary Cell (PCell) and optionally one or more Secondary Cells (SCells). In NR the term Secondary Cell Group (SCG) refers to a group of serving cells associated with the Secondary Node, comprising the Primary SCG Cell (PSCell) and optionally one or more SCells. In NR PCell refers to a serving cell in MCG, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure. In NR for a UE configured with CA, Scell is a cell providing additional radio resources on top of Special Cell. PSCell refers to a serving cell in SCG in which the UE performs random access when performing the Reconfiguration with Sync procedure. For Dual Connectivity operation the term SpCell (i.e. Special Cell) refers to the PCell of the MCG or the PSCell of the SCG, otherwise the term Special Cell refers to the PCell.
In the fifth generation wireless communication system (or NR), Physical Downlink Control Channel (PDCCH) is used to schedule downlink (DL) transmissions on Physical Downlink Shared Channel (PDSCH) and uplink (UL) transmissions on Physical Uplink Shared Channel (PUSCH). The Downlink Control Information (DCI) on PDCCH includes: Downlink assignments containing at least modulation and coding format, resource allocation, and hybrid automatic repeat request (HARQ) information related to downlink shared channel (DL-SCH); and Uplink scheduling grants containing at least modulation and coding format, resource allocation, and hybrid-ARQ information related to uplink shared channel (UL-SCH). In addition to scheduling, PDCCH can be used to activation and deactivation of configured PUSCH transmission with configured grant; activation and deactivation of PDSCH semi-persistent transmission; notifying one or more UEs of the slot format; notifying one or more UEs of the physical resource block(s) (PRB(s)) and orthogonal frequency division multiplexing (OFDM) symbol(s) where the UE may assume no transmission is intended for the UE; transmission of transmission power control (TPC) commands for Physical Uplink Control Channel (PUCCH) and PUSCH; transmission of one or more TPC commands for sounding reference signal (SRS) transmissions by one or more UEs; switching a UE's active bandwidth part; and initiating a random access procedure.
A UE monitors a set of PDCCH candidates in the configured monitoring occasions in one or more configured COntrol REsource SETs (CORESETs) according to the corresponding search space configurations. A CORESET consists of a set of PRBs with a time duration of 1 to 3 OFDM symbols. The resource units Resource Element Groups (REGs) and Control Channel Elements (CCEs) are defined within a CORESET with each CCE consisting a set of REGs. Control channels are formed by aggregation of CCE. Different code rates for the control channels are realized by aggregating different number of CCE. Interleaved and non-interleaved CCE-to-REG mapping are supported in a CORESET. Polar coding is used for PDCCH. Each resource element group carrying PDCCH carries its own demodulation reference signal (DMRS). Quadrature phase shift keying (QPSK) modulation is used for PDCCH.
In NR, a list of search space configurations are signaled by gNB for each configured bandwidth part (BWP) wherein each search configuration is uniquely identified by an identifier. Identifiers of search space configuration to be used for a specific purpose such as paging reception, system information (SI) reception, random access response (RAR) reception is explicitly signaled by gNB. In NR search space configuration comprises parameters Monitoring-periodicity-PDCCH-slot, Monitoring-offset-PDCCH-slot, Monitoring-symbols-PDCCH-within-slot, and duration. A UE determines PDCCH monitoring occasion(s) within a slot using the parameters PDCCH monitoring periodicity (Monitoring-periodicity-PDCCH-slot), the PDCCH monitoring offset (Monitoring-offset-PDCCH-slot), and the PDCCH monitoring pattern (Monitoring-symbols-PDCCH-within-slot). PDCCH monitoring occasions are there in slots âxâ to x+duration where the slot with number âxâ in a radio frame with number âyâ satisfies the Equation 1 below:
( y *(number of slots in a radio frame)+ x âMonitoring-offset-PDCCH-slot)mod(Monitoring-periodicity-PDCCH-slot)=0;ââEquation 1
The starting symbol of a PDCCH monitoring occasion in each slot having PDCCH monitoring occasion is given by Monitoring-symbols-PDCCH-within-slot. The length (in symbols) of a PDCCH monitoring occasion is given in the corset associated with the search space. search space configuration includes the identifier of CORESET configuration associated with it. A list of CORESET configurations are signaled by gNB for each configured BWP wherein each CORESET configuration is uniquely identified by an identifier. Note that each radio frame is of 10 ms duration. Radio frame is identified by a radio frame number or system frame number. Each radio frame comprises several slots wherein the number of slots in a radio frame and duration of slots depends on sub carrier spacing. The number of slots in a radio frame and duration of slots depends radio frame for each supported subcarrier spacing (SCS) is pre-defined in NR. Each CORESET configuration is associated with a list of TCI (Transmission configuration indicator) states. One DL reference signal (RS) identifier (ID) (SSB or channel state information reference signal (CSI-RS)) is configured per TCI state. The list of TCI states corresponding to a CORESET configuration is signaled by gNB via RRC signaling. One of the TCI states in the TCI state list is activated and indicated to UE by gNB. TCI state indicates the DL TX beam (DL TX beam is quasi-collocated (QCLed) with SSB/CSI RS of TCI state) used by GNB for transmission of PDCCH in the PDCCH monitoring occasions of a search space.
In NR bandwidth adaptation (BA) is supported. With BA, the receive and transmit bandwidth of a UE need not be as large as the bandwidth of the cell and can be adjusted: the width can be ordered to change (e.g., to shrink during period of low activity to save power); the location can move in the frequency domain (e.g., to increase scheduling flexibility); and the subcarrier spacing can be ordered to change (e.g., to allow different services). A subset of the total cell bandwidth of a cell is referred to as a Bandwidth Part (BWP).
BA is achieved by configuring RRC connected UE with BWP(s) and telling the UE which of the configured BWPs is currently the active one. When BA is configured, the UE only has to monitor PDCCH on the one active BWP (i.e., the UE does not have to monitor PDCCH on the entire DL frequency of the serving cell). In RRC connected state, the UE is configured with one or more DL and UL BWPs, for each configured Serving Cell (i.e. PCell or SCell). For an activated Serving Cell, one UL and DL BWP is always active at any point in time. The BWP switching for a Serving Cell is used to activate an inactive BWP and deactivate an active BWP at a time. The BWP switching is controlled by the PDCCH indicating a downlink assignment or an uplink grant, by the bwp-InactivityTimer, by RRC signaling, or by the medium access control (MAC) entity itself upon initiation of Random Access procedure. Upon addition of SpCell or activation of an SCell, the DL BWP and UL BWP indicated by firstActiveDownlinkBWP-Id and firstActiveUplinkBWP-Id respectively is active without receiving PDCCH indicating a downlink assignment or an uplink grant. The active BWP for a Serving Cell is indicated by either RRC or PDCCH. For unpaired spectrum, a DL BWP is paired with a UL BWP, and BWP switching is common for both UL and DL. Upon expiry of BWP inactivity timer UE switch to the active DL BWP to the default DL BWP or initial DL BWP (if default DL BWP is not configured).
In the 5G wireless communication system, random access (RA) is supported. Random access (RA) is used to achieve uplink (UL) time synchronization. RA is used during initial access, handover, RRC connection re-establishment procedure, scheduling request transmission, SCG addition/modification, beam failure recovery and data or control information transmission in UL by non-synchronized UE in RRC CONNECTED state. Several types of random access procedure is supported.
Contention based random access (CBRA): This is also referred as 4 step CBRA. In this type of random access, the UE first transmits Random Access preamble (also referred as Msg 1 ) and then waits for Random access response (RAR) in the RAR window. RAR is also referred as Msg 2 . The next generation node B (gNB) transmits the RAR on PDSCH. PDCCH scheduling the PDSCH carrying RAR is addressed to RA-radio network temporary identifier (RA-RNTI). RA-RNTI identifies the time-frequency resource (also referred as physical RA channel (PRACH) occasion or PRACH transmission (TX) occasion or RA channel (RACH) occasion) in which RA preamble was detected by gNB. The RA-RNTI is calculated as follows: RA-RNTI=1+s_id+14*t_id+14*80*f_id+14*80*8*ul_carrier_id, where s_id is the index of the first orthogonal frequency division multiplexing (OFDM) symbol of the PRACH occasion where UE has transmitted Msg 1 , i.e. RA preamble; 0â¤s_id<14; t_id is the index of the first slot of the PRACH occasion (0â¤t_id<80); f_id is the index of the PRACH occasion within the slot in the frequency domain (0â¤f_id<8), and ul_carrier_id is the UL carrier used for Msg 1 transmission (0 for normal UL (NUL) carrier and 1 for supplementary UL (SUL) carrier. Several RARs for various Random access preambles detected by the gNB can be multiplexed in the same RAR MAC protocol data unit (PDU) by the gNB. An RAR in a MAC PDU corresponds to the UE's RA preamble transmission if the RAR includes an RA preamble identifier (RAPID) of RA preamble transmitted by the UE. If the RAR corresponding to its RA preamble transmission is not received during the RAR window and the UE has not yet transmitted the RA preamble for a configurable number of times (configured by the gNB in RACH configuration), the UE goes back to first step (i.e., select random access resource (preamble/RACH occasion)) and transmits the RA preamble. A backoff may be applied before going back to the first step.
If the RAR corresponding to its RA preamble transmission is received, the UE transmits a message 3 (Msg 3 ) in UL grant received in RAR. The Msg 3 includes messages such as RRC connection request, RRC connection re-establishment request, RRC handover confirm, scheduling request, SI request etc. The Msg 3 may also include the UE identity (i.e., cell-radio network temporary identifier (C-RNTI) or system architecture evolution (SAE)-temporary mobile subscriber identity (S-TMSI) or a random number). After transmitting the Msg 3 , the UE starts a contention resolution timer. While the contention resolution timer is running, if the UE receives a PDCCH addressed to C-RNTI included in Msg 3 , contention resolution is considered successful, the contention resolution timer is stopped, and the RA procedure is completed. While the contention resolution timer is running, if the UE receives a contention resolution MAC control element (CE) including the UE's contention resolution identity (first X bits of common control channel (CCCH) service data unit (SDU) transmitted in Msg 3 ), contention resolution is considered successful, the contention resolution timer is stopped, and the RA procedure is completed. If the contention resolution timer expires and the UE has not yet transmitted the RA preamble for a configurable number of times, UE goes back to the first step (i.e., select random access resource (preamble/RACH occasion)), and transmits the RA preamble. A backoff may be applied before going back to first step.
Contention free random access (CFRA): This is also referred as legacy CFRA or 4 step CFRA. The CFRA procedure is used for scenarios such as handover where low latency is required, timing advance establishment for SCell, etc. The evolved node B (eNB) assigns a dedicated Random access preamble to the UE. UE transmits the dedicated RA preamble. The eNB transmits the RAR on PDSCH addressed to RA-RNTI. The RAR conveys RA preamble identifier and timing alignment information. The RAR may also include UL grant. The RAR is transmitted in RAR window similar to CBRA procedure. CFRA is considered successfully completed after receiving the RAR including RAPID of the RA preamble transmitted by the UE. In case RA is initiated for beam failure recovery, CFRA is considered successfully completed if a PDCCH addressed to C-RNTI is received in a search space for beam failure recovery. If the RAR window expires, and RA is not successfully completed and the UE has not yet transmitted the RA preamble for a configurable number of times (configured by gNB in RACH configuration), the UE retransmits the RA preamble.
For certain events such has handover and beam failure recovery if dedicated preamble(s) are assigned to UE, during first step of random access (i.e., during random access resource selection for Msg 1 transmission), the UE determines whether to transmit dedicated preamble or non-dedicated preamble. Dedicated preambles are typically provided for a subset of SSBs/CSI-RSs. If there is no SSB/CSI-RS having a DL reference signal received power (RSRP) above a threshold among the SSBs/CSI-RSs for which contention free random access resources (i.e. dedicated preambles/ROs) are provided by the gNB, the UE selects a non-dedicated preamble. Otherwise, the UE selects a dedicated preamble. So during the RA procedure, one random access attempt can be CFRA while other random access attempts can be CBRA.
2 step contention based random access (2 step CBRA): In the first step, UE transmits a random access preamble on PRACH and a payload (i.e. MAC PDU) on PUSCH. The random access preamble and payload transmission is also referred as MsgA. In the second step, after MsgA transmission, the UE monitors for a response from the network (i.e. gNB) within a configured window. The response is also referred as MsgB. If a CCCH SDU was transmitted in MsgA payload, the UE performs contention resolution using the contention resolution information in MsgB. The contention resolution is successful if the contention resolution identity received in MsgB matches the first 48 bits of the CCCH SDU transmitted in MsgA. If C-RNTI was transmitted in MsgA payload, the contention resolution is successful if the UE receives PDCCH addressed to C-RNTI. If contention resolution is successful, the random access procedure is considered successfully completed. Instead of contention resolution information corresponding to the transmitted MsgA, MsgB may include fallback information corresponding to the random access preamble transmitted in MsgA. If the fallback information is received, UE transmits Msg 3 and performs contention resolution using Msg 4 as in CBRA procedure. If contention resolution is successful, the random access procedure is considered successfully completed. If contention resolution fails upon fallback (i.e. upon transmitting Msg 3 ), the UE retransmits MsgA. If a configured window in which the UE monitors network response after transmitting MsgA expires and the UE has not received MsgB including contention resolution information or fallback information as explained above, the UE retransmits MsgA. If the random access procedure is not successfully completed even after transmitting the MsgA configurable number of times, UE fallbacks to 4 step RACH procedure i.e. UE only transmits the PRACH preamble.
MsgA payload may include one or more of a CCCH SDU, a dedicated control channel (DCCH) SDU, a dedicated traffic channel (DTCH) SDU, a buffer status report (BSR) MAC CE, a power headroom report (PHR) MAC CE, SSB information, a C-RNTI MAC CE, or padding. The MsgA may include a UE ID (e.g. random ID, S-TMSI, C-RNTI, resume ID, etc.) along with the preamble in the first step. The UE ID may be included in the MAC PDU of the MsgA. A UE ID such as C-RNTI may be carried in the MAC CE, wherein the MAC CE is included in MAC PDU. Other UE IDs (such as random ID, S-TMSI, C-RNTI, resume ID, etc.) may be carried in CCCH SDU. The UE ID can be one of random ID, S-TMSI, C-RNTI, resume ID, IMSI, idle mode ID, inactive mode ID, etc. The UE ID can be different in different scenarios in which UE performs the RA procedure. When the UE performs RA after power on (before it is attached to the network), then the UE ID is the random ID. When the UE performs RA in IDLE state after the UE is attached to network, then the UE ID is S-TMSI. If UE has an assigned C-RNTI (e.g. in connected state), the UE ID is C-RNTI. In case the UE is in INACTIVE state, the UE ID is resume ID. In addition to UE ID, some addition ctrl information can be sent in MsgA. The control information may be included in the MAC PDU of the MsgA. The control information may include one or more of connection request indication, connection resume request indication, SI request indication, buffer status indication, beam information (e.g. one or more DL TX beam ID(s) or SSB ID(s)), beam failure recovery indication/information, data indicator, cell/BS/TRP switching indication, connection re-establishment indication, reconfiguration complete or handover complete message, etc.
2 step contention free random access (2 step CFRA): In this case, the gNB assigns dedicated Random access preamble(s) and PUSCH resource(s) to the UE for MsgA transmission. RO(s) to be used for preamble transmission may also be indicated. In the first step, the UE transmits random access preamble on PRACH and a payload on PUSCH using the contention free random access resources (i.e., dedicated preamble/PUSCH resource/RO). In the second step, after MsgA transmission, the UE monitors for a response from the network (i.e., gNB) within a configured window. If the UE receives PDCCH addressed to C-RNTI, random access procedure is considered successfully completed. If the UE receives fallback information corresponding to its transmitted preamble, random access procedure is considered successfully completed.
For certain events such has handover and beam failure recovery if dedicated preamble(s) and PUSCH resource(s) are assigned to UE, during the first step of random access (i.e., during random access resource selection for MsgA transmission), the UE determines whether to transmit a dedicated preamble or a non-dedicated preamble. Dedicated preambles are typically provided for a subset of SSBs/CSI-RSs. If there is no SSB/CSI-RS having DL RSRP above a threshold amongst the SSBs/CSI-RSs for which contention free random access resources (i.e., dedicated preambles/ROs/PUSCH resources) are provided by the gNB, the UE selects a non dedicated preamble. Otherwise UE select dedicated preamble. So during the RA procedure, one random access attempt can be 2 step CFRA while other random access attempt can be 2 step CBRA.
Upon initiation of random access procedure, the UE first selects the carrier (SUL or NUL). If the carrier to use for the Random Access procedure is explicitly signaled by the gNB, the UE selects the signaled carrier for performing Random Access procedure. If the carrier to use for the Random Access procedure is not explicitly signaled by gNB, if the Serving Cell for the Random Access procedure is configured with supplementary uplink, and if the RSRP of the downlink pathloss reference is less than rsrp-ThresholdSSB-SUL, then the UE selects the SUL carrier for performing Random Access procedure. Otherwise, the UE selects the NUL carrier for performing Random Access procedure. Upon selecting the UL carrier, the UE determines the UL and DL BWP for random access procedure as specified in section 5.15 of TS 38.321. The UE then determines whether to perform 2 step or 4 step RACH for this random access procedure.
If this random access procedure is initiated by PDCCH order and if the ra-Preamblelndex explicitly provided by PDCCH is not 0b000000, UE selects 4 step RACH. else if 2 step contention free random access resources are signaled by gNB for this random access procedure, then the UE selects 2 step RACH. else if 4 step contention free random access resources are signaled by gNB for this random access procedure, then the UE selects 4 step RACH. else if the UL BWP selected for this random access procedure is configured with only 2 step RACH resources, then the UE selects 2 step RACH. else if the UL BWP selected for this random access procedure is configured with only 4 step RACH resources, then the UE selects 4 step RACH. else if the UL BWP selected for this random access procedure is configured with both 2 step and 4 step RACH resources,
if RSRP of the downlink pathloss reference is below a configured threshold, then the UE selects 4 step RACH. Otherwise UE selects 2 step RACH.
In the fifth generation wireless communication system, node B (gNB) or base station in cell broadcast Synchronization Signal and PBCH block (SSB) consists of primary synchronization signal (PSS) and secondary synchronization signal (SSS) and system information. System information (SI) includes common parameters needed to communicate in cell. In the fifth generation wireless communication system (also referred as next generation radio or NR), SI is divided into the master information block (MIB) and a number of system information blocks (SIB s) where:
the MIB is always transmitted on the BCH with a periodicity of 80 ms and repetitions made within 80 ms and includes parameters that are needed to acquire system information block 1 (SIB 1 ) from the cell. the SIB 1 is transmitted on the DL-SCH with a periodicity of 160 ms and variable transmission repetition. The default transmission repetition periodicity of SIB 1 is 20 ms but the actual transmission repetition periodicity is up to network implementation. The scheduling information in SIB 1 includes mapping between SIBs and SI messages, periodicity of each SI message and SI window length. The scheduling information in SIB 1 includes an indicator for each SI message, which indicates whether the concerned SI message is being broadcasted or not. If at least one SI message is not being broadcasted, SIB 1 may include random access resources (PRACH preamble(s) and PRACH resource(s)) for requesting gNB to broadcast one or more SI message(s). SIBs other than SIB 1 are carried in SystemInformation (SI) messages, which are transmitted on the DL-SCH. Only SIBs having the same periodicity can be mapped to the same SI message. Each SI message is transmitted within periodically occurring time domain windows (referred to as SI-windows with same length for all SI messages). Each SI message is associated with a SI-window and the SI-windows of different SI messages do not overlap. Within one SI-window only the corresponding SI message is transmitted. Any SIB except SIB 1 can be configured to be cell specific or area specific, using an indication in SIB 1 . The cell specific SIB is applicable only within a cell that provides the SIB while the area specific SIB is applicable within an area referred to as SI area, which consists of one or several cells and is identified by systemInformationAreaID.
In the fifth generation wireless communication system, RRC can be in one of the following states: RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED. A UE is either in RRC_CONNECTED state or in RRC_INACTIVE state when an RRC connection has been established. If this is not the case, i.e. no RRC connection is established, the UE is in RRC_IDLE state. The RRC states can further be characterized as follows:
In the RRC_IDLE, a UE specific discontinuous (DRX) may be configured by upper layers. The UE monitors Short Messages transmitted with paging RNTI (P-RNTI) over DCI; monitors a Paging channel for CN paging using 5G-S-temoprary mobile subscriber identity (5G-S-TMSI); performs neighboring cell measurements and cell (re-)selection; acquires system information and can send SI request (if configured); performs logging of available measurements together with location and time for logged measurement configured UEs.
In RRC_INACTIVE, a UE specific DRX may be configured by upper layers or by RRC layer, the UE stores the UE Inactive AS context, and a RAN-based notification area is configured by RRC layer. The UE monitors Short Messages transmitted with P-RNTI over DCI; monitors a Paging channel for CN paging using 5G-S-TMSI and RAN paging using fullI-RNTI; performs neighboring cell measurements and cell (re-)selection; performs RAN-based notification area updates periodically and when moving outside the configured RAN-based notification area; acquires system information and can send SI request (if configured); and performs logging of available measurements together with location and time for logged measurement configured UEs.
In the RRC_CONNECTED, the UE stores the AS context and transfer of unicast data to/from UE takes place. The UE monitors Short Messages transmitted with P-RNTI over DCI, if configured; monitors control channels associated with the shared data channel to determine if data is scheduled for it; provides channel quality and feedback information; performs neighboring cell measurements and measurement reporting; and acquires system information.
In the RRC_CONNECTED, network may initiate suspension of the RRC connection by sending RRCRelease with suspend configuration. When the RRC connection is suspended, the UE stores the UE Inactive AS context and any configuration received from the network, and transits to RRC_INACTIVE state. If the UE is configured with SCG, the UE releases the SCG configuration upon initiating a RRC Connection Resume procedure. The RRC message to suspend the RRC connection is integrity protected and ciphered.
The resumption of a suspended RRC connection is initiated by upper layers when the UE needs to transit from RRC_INACTIVE state to RRC_CONNECTED state or by RRC layer to perform a RAN based notification area (RNA) update or by RAN paging from NG-RAN. When the RRC connection is resumed, network configures the UE according to the RRC connection resume procedure based on the stored UE Inactive AS context and any RRC configuration received from the network. The RRC connection resume procedure re-activates AS security and re-establishes signaling radio bearer(s) (SRB(s)) and data radio bearer(s) (DRB(s)). In response to a request to resume the RRC connection, the network may resume the suspended RRC connection and send the UE to RRC_CONNECTED, or reject the request to resume and send the UE to RRC_INACTIVE (with a wait timer), or directly re-suspend the RRC connection and send the UE to RRC_INACTIVE, or directly release the RRC connection and send the UE to RRC_IDLE, or instruct the UE to initiate NAS level recovery (in this case the network sends an RRC setup message).
Upon initiating the resume procedure, the UE:
applies the default L 1 parameter values as specified in corresponding physical layer specifications, except for the parameters for which values are provided in SIB 1 ; applies the default MAC Cell Group configuration applies the CCCH configuration starts the timer T 319 ; applies the timeAlignmentTimerCommon included in SIB 1
applies the default SRB 1 configuration sets the variable pendingRNA-Update to false; initiates transmission of the RRCResumeRequest message or RRCResumeRequest 1
restores the RRC configuration, RoHC state, the stored QoS flow to DRB mapping rules and the KgNB and K RRCint keys from the stored UE Inactive AS context except for the following:
masterCellGroup; mrdc-SecondaryCellGroup, if stored; and pdcp-Config;
sets the resumeMAC-I to the 16 least significant bits of the MAC-I calculated:
over the ASN. 1 encoded as per clause 8 (i.e., a multiple of 8 bits) VarResumeMAC-Input; with the K RRCInt key in the UE Inactive AS Context and the previously configured integrity protection algorithm; and with all input bits for COUNT, BEARER and DIRECTION set to binary ones;
derives the KgNB key based on the current KgNB key or the NH, using the stored nextHopChainingCount value; derives the K RRCenc key, the K RRCint key, the K UPint key and the K UPenc key; configures lower layers to apply integrity protection for all signaling radio bearers except SRB 0 using the configured algorithm and the K RRCint key and K UPint key, i.e., integrity protection shall be applied to all subsequent messages received and sent by the UE; configures lower layers to apply ciphering for all signaling radio bearers except SRB 0 and to apply the configured ciphering algorithm, the K RRCenc key and the K UPenc key derived, i.e. the ciphering configuration shall be applied to all subsequent messages received and sent by the UE; re-establishes PDCP entities for SRB 1 ; resumes SRB 1 ; and transmits RRCResumeRequest or RRCResumeRequest 1 .
In the 4G wireless communication system, for small data transmission in RRC_IDLE, the UE can be configured with preconfigured UL resources. The UE receives PUSCH resources (e.g., periodic UL grants) for small data transmission in RRC connection release message. If the UE has a small amount of data to transmit in RRC_IDLE, the UE is camped in the same cell from which the UE has received UL grants in the RRC connection release message, and the UE has a valid TA, then the UE selects the earliest UL grant and transmits the MAC PDU in the selected UL grant. The UE waits for response from the network within a configured time interval. For the response, the UE monitors PDCCH addressed to an RNTI assigned to UE in RRC connection release message. If the response is not received, small data transmission is considered to have failed.
5G wireless communication system supports multiple beams, multiple UL carriers, multiple BWPs and search spaces for PDCCH monitoring. Not all these aspects are considered in the existing procedure. The small data transmission procedure should be enhanced to support multiple beams, multiple UL carriers, multiple BWPs and search spaces for PDCCH monitoring.
In the 5G wireless communication system, logical channel prioritization (LCP) procedure is used to generate MAC PDU. RRC controls the LCP procedure by configuring mapping restrictions for each logical channel:
allowedSCS-List, which sets the allowed Subcarrier Spacing(s) for transmission; maxPUSCH-Duration, which sets the maximum PUSCH duration allowed for transmission; configuredGrantTypel Allowed, which sets whether a configured grant Type 1 can be used for transmission; allowedServingCells, which sets the allowed cell(s) for transmission; allowedCG-List, which sets the allowed configured grant(s) for transmission; allowedPHY-Prioritylndex, which sets the allowed PHY priority index(es) of a dynamic grant for transmission.
<div id="p-0070
CLAIMS
Claims ( 20 )
What is claimed is:
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, a radio resource control (RRC) release message to transit the terminal in an RRC connected state to an RRC inactive state, wherein the RRC release message includes a configuration of configured uplink resources for a small data transmission (SDT), wherein the SDT is a procedure for data transmission while the terminal is in the RRC inactive state, and wherein the configuration includes a first configuration of at least one configured uplink resource for a normal uplink (NUL), and a second configuration of at least one configured uplink resource for a supplementary uplink (SUL);
selecting an uplink carrier for the SDT among the NUL or the SUL, based on a first reference signal received power (RSRP) threshold associated with SUL selection;
selecting a synchronization signal block (SSB) among SSBs, based on a second RSRP threshold associated with SSB selection for the SDT, wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and wherein the SSBs are associated with at least one configured uplink resource for the SDT; and
transmitting, to the base station, uplink data on the selected uplink carrier using a configured uplink resource associated with the selected SSB.
2. The method of claim 1 ,
wherein the SSBs associated with the at least one configured uplink resource for the SDT are identified based on information on one or more SSB indexes associated with a configuration for the selected uplink carrier, or all SSBs received in a cell associated with the NUL and the SUL, and
wherein the information on the one or more SSB indexes associated with the configuration for the selected uplink carrier is received by the RRC release message.
3. The method of claim 1 , further comprising:
monitoring physical downlink control channel (PDCCH) addressed to cellâradio network temporary identity (C-RNTI) for a response to the uplink data,
wherein information on a PDCCH configuration for an initial downlink bandwidth part (BWP) of the selected uplink carrier is received from the base station, and
wherein the information on the PDCCH configuration includes information on an SDT search space for monitoring the PDCCH.
4. The method of claim 3 , further comprising:
in case that the PDCCH addressed to the C-RNTI is not received, identifying whether an SSB corresponding to a configured uplink resource for retransmission of the uplink data has a same SSB index as the selected SSB; and
in case that the SSB corresponding to the configured uplink resource for the retransmission has the same SSB index as the selected SSB, selecting the SSB corresponding to the configured uplink resource for the retransmission.
5. The method of claim 1 , wherein the first RSRP threshold associated with SUL selection and the second RSRP threshold associated with SSB selection for the SDT are configured by the base station.
6. A method performed by a base station in a wireless communication system, the method comprising:
transmitting, to a terminal, a radio resource control (RRC) release message to transit the terminal in an RRC connected state to an RRC inactive state, wherein the RRC release message includes a configuration of configured uplink resources for a small data transmission (SDT), wherein the SDT is a procedure for data transmission while the terminal is in the RRC inactive state, and wherein the configuration includes a first configuration of at least one configured uplink resource for a normal uplink (NUL), and a second configuration of at least one configured uplink resource for a supplementary uplink (SUL); and
receiving, from the terminal, uplink data on an uplink carrier for the SDT based on a configured uplink resource associated with a synchronization signal block (SSB), wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH),
wherein the uplink carrier for the SDT is one selected from the NUL or the SUL based on a first reference signal received power (RSRP) threshold associated with SUL selection,
wherein the SSB is one selected from SSBs based on a second RSRP threshold associated with SSB selection for the SDT, and
wherein the SSBs are associated with at least one configured uplink resource for the SDT.
7. The method of claim 6 ,
wherein the SSBs associated with the at least one configured uplink resource for the SDT are identified based on information on one or more SSB indexes associated with a configuration of the uplink carrier for the SDT, or all SSBs received in a cell associated with the NUL and the SUL, and
wherein the information on the one or more SSB indexes associated with the configuration for the selected uplink carrier is transmitted by the RRC release message.
8. The method of claim 7 ,
wherein information on a physical downlink control channel (PDCCH) configuration for an initial downlink bandwidth part (BWP) of the selected uplink carrier is transmitted to the terminal, and
wherein the information on the PDCCH configuration includes information on an SDT search space for monitoring PDCCH for a response to the uplink data.
9. The method of claim 8 , wherein PDCCH addressed to cell-radio network temporary identity (C-RNTI) is not detected by the terminal, an SSB corresponding to a configured uplink resource for retransmission of the uplink data which has a same SSB index as the selected SSB is selected for the retransmission.
10. The method of claim 6 , wherein the first RSRP threshold associated with SUL selection and the second RSRP threshold associated with SSB selection for the SDT are configured by the base station.
11. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
a controller configured to:
receive, from a base station via the transceiver, a radio resource control (RRC) release message to transit the terminal in an RRC connected state to an RRC inactive state, wherein the RRC release message includes a configuration of configured uplink resources for a small data transmission (SDT), wherein the SDT is a procedure for data transmission while the terminal is in the RRC inactive state, and wherein the configuration includes a first configuration of at least one configured uplink resource for a normal uplink (NUL), and a second configuration of at least one configured uplink resource for a supplementary uplink (SUL),
select an uplink carrier for the SDT among the NUL or the SUL, based on a first reference signal received power (RSRP) threshold associated with SUL selection,
select a synchronization signal block (SSB) among SSBs, based on a second RSRP threshold associated with SSB selection for the SDT, wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and wherein the SSBs are associated with at least one configured uplink resource for the SDT, and
transmit, to the base station via the transceiver, uplink data on the selected uplink carrier using a configured uplink resource associated with the selected SSB.
12. The terminal of claim 11 ,
wherein the SSBs associated with the at least one configured uplink resource for the SDT are identified based on information on one or more SSB indexes associated with a configuration for the selected uplink carrier, or all SSBs received in a cell associated with the NUL and the SUL, and
wherein the information on the one or more SSB indexes associated with the configuration for the selected uplink carrier is received by the RRC release message.
13. The terminal of claim 11 ,
wherein the controller is further configured to monitor physical downlink control channel (PDCCH) addressed to cellâradio network temporary identity (C-RNTI) for a response to the uplink data,
wherein information on a PDCCH configuration for an initial downlink bandwidth part (BWP) of the selected uplink carrier is received from the base station, and
wherein the information on the PDCCH configuration includes information on an SDT search space for monitoring the PDCCH.
14. The terminal of claim 13 , wherein the controller is further configured to:
in case that the PDCCH addressed to the C-RNTI is not received, identify whether an SSB corresponding to a configured uplink resource for retransmission of the uplink data has a same SSB index as the selected SSB, and
in case that the SSB corresponding to the configured uplink resource for the retransmission has the same SSB index as the selected SSB, select the SSB corresponding to the configured uplink resource for the retransmission.
15. The terminal of claim 11 , wherein the first RSRP threshold associated with SUL selection and the second RSRP threshold associated with SSB selection for the SDT are configured by the base station.
16. A base station in a wireless communication system, the base station comprising:
a transceiver; and
a controller configured to:
transmit, to a terminal via the transceiver, a radio resource control (RRC) release message to transit the terminal in an RRC connected state to an RRC inactive state, wherein the RRC release message includes a configuration of configured uplink resources for a small data transmission (SDT), wherein the SDT is a procedure for data transmission while the terminal is in the RRC inactive state, and wherein the configuration includes a first configuration of at least one configured uplink resource for a normal uplink (NUL), and a second configuration of at least one configured uplink resource for a supplementary uplink (SUL), and
receive, from the terminal via the transceiver, uplink data on an uplink carrier for the SDT based on a configured uplink resource associated with a synchronization signal block (SSB), wherein the SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH),
wherein the uplink carrier for the SDT is one selected from the NUL or the SUL based on a first reference signal received power (RSRP) threshold associated with SUL selection,
wherein the SSB is one selected from SSBs based on a second RSRP threshold associated with SSB selection for the SDT, and
wherein the SSBs are associated with at least one configured uplink resource for the SDT.
17. The base station of claim 16 ,
wherein the SSBs associated with the at least one configured uplink resource for the SDT are identified based on information on one or more SSB indexes associated with a configuration of the uplink carrier for the SDT, or all SSBs received in a cell associated with the NUL and the SUL, and
wherein the information on the one or more SSB indexes associated with the configuration for the selected uplink carrier is transmitted by the RRC release message.
18. The base station of claim 17 ,
wherein information on a physical downlink control channel (PDCCH) configuration for an initial downlink bandwidth part (BWP) of the selected uplink carrier is transmitted to the terminal, and
wherein the information on the PDCCH configuration includes information on an SDT search space for monitoring PDCCH for a response to the uplink data.
19. The base station of claim 18 , wherein PDCCH addressed to cell-radio network temporary identity (C-RNTI) is not detected by the terminal, an SSB corresponding to a configured uplink resource for retransmission of the uplink data which has a same SSB index as the selected SSB is selected for the retransmission.
20. The base station of claim 16 , wherein the first RSRP threshold associated with SUL selection and the second RSRP threshold associated with SSB selection for the SDT are configured by the base station.
US18/415,179
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