ABSTRACT
Abstract
A method for clock synchronization in a communication system having first circuitry coupled to a first communication channel and second circuitry, includes generating a first timing synchronization parameter, and synchronizing the second circuitry to a second communication channel using the first timing synchronization parameter.
Description
RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 15/592,260, entitled âSynchronizing A 5G Communication Channel Using A 4G Timing Synchronization Parameter,â filed on May 11, 2017, which claims the benefit of U.S. Provisional Patent Application No. 62/398,186, entitled âSynchronizing 5G Communication Channel Using 4G Synchronization Parameter,â filed Sep. 22, 2016, the contents of both applications being hereby incorporated by reference in their entirety.
FIELD
The present disclosure relates to wireless communication systems, and more particularly to timing synchronization in wireless communications.
BACKGROUND
Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include code-division multiple access (CDMA) systems, time-division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, and orthogonal frequency-division multiple access (OFDMA) systems.
By way of example, a wireless multiple-access communication system may include a number of base stations, each simultaneously supporting communication for multiple communication devices, otherwise known as user equipments (UEs). A base station may communicate with UEs on downlink channels (e.g., for transmissions from a base station to a UE) and uplink channels (e.g., for transmissions from a UE to a base station). UEs may locate a base station by detecting synchronization signal(s) from which the UEs acquire the base station identification code (cell ID), system timing information, frame alignment information, etc. In systems where the receiver is highly signal strength and noise limited (e.g., millimeter wave systems), beamformed synchronization signals may be swept across the cell coverage area to provide coverage enhancement to improve detection.
SUMMARY
Various implementations of systems, methods and devices within the scope of the appended claims each have several aspects, no single one of which is solely responsible for the desirable attributes described herein. Without limiting the scope of the appended claims, some prominent features are described herein.
Details of one or more implementations of the subject matter described in this specification are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.
One aspect of the disclosure provides a method for clock synchronization in a communication system having first circuitry coupled to a first communication channel and second circuitry, the method including generating a first timing synchronization parameter, and synchronizing the second circuitry to a second communication channel using the first timing synchronization parameter.
Another aspect of the disclosure provides an apparatus for clock synchronization in a communication system including first circuitry coupled to a first communication channel, second circuitry, and a first timing synchronization parameter configured to allow the second circuitry to establish communication with a second communication channel.
Another aspect of the disclosure provides a device including means for coupling first circuitry to a first communication channel, means for generating a first timing synchronization parameter, and means for synchronizing second circuitry to a second communication channel using the first timing synchronization parameter.
Another aspect of the disclosure provides a non-transitory computer-readable medium storing computer executable code for clock synchronization in a communication system having first circuitry coupled to a first communication channel and second circuitry, the code executable by a processor to generate a first timing synchronization parameter, and synchronize the second circuitry to a second communication channel using the first timing synchronization parameter.
BRIEF DESCRIPTION OF THE DRAWINGS
In the figures, like reference numerals refer to like parts throughout the various views unless otherwise indicated. For reference numerals with letter character designations such as â 102 a â or â 102 b â, the letter character designations may differentiate two like parts or elements present in the same figure. Letter character designations for reference numerals may be omitted when it is intended that a reference numeral encompass all parts having the same reference numeral in all figures.
FIG. 1 is a diagram showing a wireless communication system, in accordance with various aspects of the present disclosure.
FIG. 2 is a block diagram showing a device configured for use in wireless communication, in accordance with various aspects of the present disclosure.
FIG. 3 is a block diagram showing a device configured for use in wireless communication, in accordance with various aspects of the present disclosure.
FIG. 4 is a block diagram showing a device configured for use in wireless communication, in accordance with various aspects of the present disclosure.
FIG. 5 is a block diagram showing a wireless communication system, in accordance with various aspects of the present disclosure.
FIG. 6 is a block diagram showing a wireless communication system, in accordance with various aspects of the present disclosure.
FIG. 7 is a block diagram showing a wireless communication system, in accordance with various aspects of the present disclosure.
FIG. 8 is a block diagram showing a wireless communication system, in accordance with various aspects of the present disclosure.
FIG. 9 is a flow chart illustrating an example of a method for communication, in accordance with various aspects of the present disclosure.
FIG. 10 is a flow chart illustrating an example of a method for communication, in accordance with various aspects of the present disclosure.
FIG. 11 is a flow chart illustrating an example of a method for communication, in accordance with various aspects of the present disclosure.
FIG. 12 is a flow chart illustrating an example of a method for communication, in accordance with various aspects of the present disclosure.
FIG. 13 is a functional block diagram of an apparatus for communication, in accordance with various aspects of the present disclosure.
FIG. 14 is a functional block diagram of an apparatus for communication, in accordance with various aspects of the present disclosure.
FIG. 15 is a functional block diagram of an apparatus for communication, in accordance with various aspects of the present disclosure.
FIG. 16 is a functional block diagram of an apparatus for communication, in accordance with various aspects of the present disclosure.
DETAILED DESCRIPTION
The word âexemplaryâ is used herein to mean âserving as an example, instance, or illustration.â Any aspect described herein as âexemplaryâ is not necessarily to be construed as preferred or advantageous over other aspects.
The following description provides examples, and is not limiting of the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For instance, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Also, features described with respect to some examples may be combined in other examples.
In a communication system having UEs that may simultaneously support both 4G and 5G communication, it is possible that a UE may be operatively coupled to a base station using 4G transmissions, but it may also be desirable for the UE to couple to the base station to support 5G connectivity. When coupling to a base station, a UE observes synchronization signals that allow the UE to establish proper timing and clocking of the transmission signals in order to establish a communication channel with the base station. For example, in a UE having dual connectivity capability including the ability to establish a 4G communication channel and a 5G communication channel, a UE may be coupled to a base station using 4G connectivity, but may also wish to couple to the base station using 5G connectivity. Therefore, it may be advantageous to leverage at least some of the 4G connectivity and timing synchronization parameters to allow the UE to efficiently establish 5G connectivity.
Exemplary embodiments of the disclosure are directed to synchronization signals used to establish wireless communication device connectivity and elements thereof, for example using an existing 4G synchronization signal to establish a clock and timing reference signal to allow the efficient establishment of 5G device connectivity.
FIG. 1 illustrates an example of a wireless communications system 100 in accordance with various aspects of the disclosure. The wireless communications system 100 includes base stations 105 , UEs 115 , and a core network 130 . The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The base stations 105 interface with the core network 130 through a first set of backhaul links 132 (e.g., S1, etc.) and may perform radio configuration and scheduling for communication with the UEs 115 , or may operate under the control of a base station controller (not shown). In various examples, the base stations 105 may communicate, either directly or indirectly (e.g., through core network 130 ), with each other over a second set of backhaul links 134 (e.g., X1, etc.), which may be wired or wireless communication links.
The base stations 105 may wirelessly communicate with the UEs 115 via one or more base station antennas. Each of the base station 105 sites may provide communication coverage for a respective geographic coverage area 110 . In some examples, base stations 105 may be referred to as a base transceiver station, a radio base station, an access point, a radio transceiver, a gNodeB (gNB), a NodeB, eNodeB (eNB), Home NodeB, a Home eNodeB, or some other suitable terminology. The geographic coverage area 110 for a base station 105 may be divided into sectors making up only a portion of the coverage area (not shown). The wireless communications system 100 may include base stations 105 of different types (e.g., macro and/or small cell base stations). There may be overlapping geographic coverage areas 110 for different technologies.
In some examples, the wireless communications system 100 may be one or more of an LTE/LTE-A network and a 5G network. In LTE/LTE-A networks, the term evolved Node B (eNB) may be generally used to describe the base stations 105 , while the term UE may be generally used to describe the UEs 115 . In contrast, in 5G or New Radio (NR) networks, base stations 105 may be referred to as gNBs. The wireless communications system 100 may be a Heterogeneous LTE/LTE-A network in which different types of eNBs provide coverage for various geographical regions. For example, each eNB or base station 105 may provide communication coverage for a macro cell, a small cell, and/or other types of cell. The term âcellâ is a 3GPP term that can be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (e.g., sector, etc.) of a carrier or base station, depending on context. In some examples, the wireless communications system 100 may be, or may include a millimeter wave communication network.
<div id="p-0036" num="0035" class="description-para
RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 15/592,260, entitled âSynchronizing A 5G Communication Channel Using A 4G Timing Synchronization Parameter,â filed on May 11, 2017, which claims the benefit of U.S. Provisional Patent Application No. 62/398,186, entitled âSynchronizing 5G Communication Channel Using 4G Synchronization Parameter,â filed Sep. 22, 2016, the contents of both applications being hereby incorporated by reference in their entirety.
FIELD
The present disclosure relates to wireless communication systems, and more particularly to timing synchronization in wireless communications.
BACKGROUND
Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include code-division multiple access (CDMA) systems, time-division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, and orthogonal frequency-division multiple access (OFDMA) systems.
By way of example, a wireless multiple-access communication system may include a number of base stations, each simultaneously supporting communication for multiple communication devices, otherwise known as user equipments (UEs). A base station may communicate with UEs on downlink channels (e.g., for transmissions from a base station to a UE) and uplink channels (e.g., for transmissions from a UE to a base station). UEs may locate a base station by detecting synchronization signal(s) from which the UEs acquire the base station identification code (cell ID), system timing information, frame alignment information, etc. In systems where the receiver is highly signal strength and noise limited (e.g., millimeter wave systems), beamformed synchronization signals may be swept across the cell coverage area to provide coverage enhancement to improve detection.
SUMMARY
Various implementations of systems, methods and devices within the scope of the appended claims each have several aspects, no single one of which is solely responsible for the desirable attributes described herein. Without limiting the scope of the appended claims, some prominent features are described herein.
Details of one or more implementations of the subject matter described in this specification are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.
One aspect of the disclosure provides a method for clock synchronization in a communication system having first circuitry coupled to a first communication channel and second circuitry, the method including generating a first timing synchronization parameter, and synchronizing the second circuitry to a second communication channel using the first timing synchronization parameter.
Another aspect of the disclosure provides an apparatus for clock synchronization in a communication system including first circuitry coupled to a first communication channel, second circuitry, and a first timing synchronization parameter configured to allow the second circuitry to establish communication with a second communication channel.
Another aspect of the disclosure provides a device including means for coupling first circuitry to a first communication channel, means for generating a first timing synchronization parameter, and means for synchronizing second circuitry to a second communication channel using the first timing synchronization parameter.
Another aspect of the disclosure provides a non-transitory computer-readable medium storing computer executable code for clock synchronization in a communication system having first circuitry coupled to a first communication channel and second circuitry, the code executable by a processor to generate a first timing synchronization parameter, and synchronize the second circuitry to a second communication channel using the first timing synchronization parameter.
BRIEF DESCRIPTION OF THE DRAWINGS
In the figures, like reference numerals refer to like parts throughout the various views unless otherwise indicated. For reference numerals with letter character designations such as â 102 a â or â 102 b â, the letter character designations may differentiate two like parts or elements present in the same figure. Letter character designations for reference numerals may be omitted when it is intended that a reference numeral encompass all parts having the same reference numeral in all figures.
FIG. 1 is a diagram showing a wireless communication system, in accordance with various aspects of the present disclosure.
FIG. 2 is a block diagram showing a device configured for use in wireless communication, in accordance with various aspects of the present disclosure.
FIG. 3 is a block diagram showing a device configured for use in wireless communication, in accordance with various aspects of the present disclosure.
FIG. 4 is a block diagram showing a device configured for use in wireless communication, in accordance with various aspects of the present disclosure.
FIG. 5 is a block diagram showing a wireless communication system, in accordance with various aspects of the present disclosure.
FIG. 6 is a block diagram showing a wireless communication system, in accordance with various aspects of the present disclosure.
FIG. 7 is a block diagram showing a wireless communication system, in accordance with various aspects of the present disclosure.
FIG. 8 is a block diagram showing a wireless communication system, in accordance with various aspects of the present disclosure.
FIG. 9 is a flow chart illustrating an example of a method for communication, in accordance with various aspects of the present disclosure.
FIG. 10 is a flow chart illustrating an example of a method for communication, in accordance with various aspects of the present disclosure.
FIG. 11 is a flow chart illustrating an example of a method for communication, in accordance with various aspects of the present disclosure.
FIG. 12 is a flow chart illustrating an example of a method for communication, in accordance with various aspects of the present disclosure.
FIG. 13 is a functional block diagram of an apparatus for communication, in accordance with various aspects of the present disclosure.
FIG. 14 is a functional block diagram of an apparatus for communication, in accordance with various aspects of the present disclosure.
FIG. 15 is a functional block diagram of an apparatus for communication, in accordance with various aspects of the present disclosure.
FIG. 16 is a functional block diagram of an apparatus for communication, in accordance with various aspects of the present disclosure.
DETAILED DESCRIPTION
The word âexemplaryâ is used herein to mean âserving as an example, instance, or illustration.â Any aspect described herein as âexemplaryâ is not necessarily to be construed as preferred or advantageous over other aspects.
The following description provides examples, and is not limiting of the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For instance, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Also, features described with respect to some examples may be combined in other examples.
In a communication system having UEs that may simultaneously support both 4G and 5G communication, it is possible that a UE may be operatively coupled to a base station using 4G transmissions, but it may also be desirable for the UE to couple to the base station to support 5G connectivity. When coupling to a base station, a UE observes synchronization signals that allow the UE to establish proper timing and clocking of the transmission signals in order to establish a communication channel with the base station. For example, in a UE having dual connectivity capability including the ability to establish a 4G communication channel and a 5G communication channel, a UE may be coupled to a base station using 4G connectivity, but may also wish to couple to the base station using 5G connectivity. Therefore, it may be advantageous to leverage at least some of the 4G connectivity and timing synchronization parameters to allow the UE to efficiently establish 5G connectivity.
Exemplary embodiments of the disclosure are directed to synchronization signals used to establish wireless communication device connectivity and elements thereof, for example using an existing 4G synchronization signal to establish a clock and timing reference signal to allow the efficient establishment of 5G device connectivity.
FIG. 1 illustrates an example of a wireless communications system 100 in accordance with various aspects of the disclosure. The wireless communications system 100 includes base stations 105 , UEs 115 , and a core network 130 . The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The base stations 105 interface with the core network 130 through a first set of backhaul links 132 (e.g., S1, etc.) and may perform radio configuration and scheduling for communication with the UEs 115 , or may operate under the control of a base station controller (not shown). In various examples, the base stations 105 may communicate, either directly or indirectly (e.g., through core network 130 ), with each other over a second set of backhaul links 134 (e.g., X1, etc.), which may be wired or wireless communication links.
The base stations 105 may wirelessly communicate with the UEs 115 via one or more base station antennas. Each of the base station 105 sites may provide communication coverage for a respective geographic coverage area 110 . In some examples, base stations 105 may be referred to as a base transceiver station, a radio base station, an access point, a radio transceiver, a gNodeB (gNB), a NodeB, eNodeB (eNB), Home NodeB, a Home eNodeB, or some other suitable terminology. The geographic coverage area 110 for a base station 105 may be divided into sectors making up only a portion of the coverage area (not shown). The wireless communications system 100 may include base stations 105 of different types (e.g., macro and/or small cell base stations). There may be overlapping geographic coverage areas 110 for different technologies.
In some examples, the wireless communications system 100 may be one or more of an LTE/LTE-A network and a 5G network. In LTE/LTE-A networks, the term evolved Node B (eNB) may be generally used to describe the base stations 105 , while the term UE may be generally used to describe the UEs 115 . In contrast, in 5G or New Radio (NR) networks, base stations 105 may be referred to as gNBs. The wireless communications system 100 may be a Heterogeneous LTE/LTE-A network in which different types of eNBs provide coverage for various geographical regions. For example, each eNB or base station 105 may provide communication coverage for a macro cell, a small cell, and/or other types of cell. The term âcellâ is a 3GPP term that can be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (e.g., sector, etc.) of a carrier or base station, depending on context. In some examples, the wireless communications system 100 may be, or may include a millimeter wave communication network.
A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell is a lower-powered base station, as compared with a macro cell, that may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency bands as macro cells. Small cells may include pico cells, femto cells, and micro cells according to various examples. A pico cell may cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A femto cell also may cover a relatively small geographic area (e.g., a home) and may provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in the home, and the like). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB or a home eNB. An eNB may support one or multiple (e.g., two, three, four, and the like) cells (e.g., component carriers).
The wireless communications system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operations.
The communication networks that may accommodate some of the various disclosed examples may be packet-based networks that operate according to a layered protocol stack. In the user plane, communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels. A Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer may also use Hybrid ARQ (HARQ) to provide retransmission at the MAC layer to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and the base stations 105 or core network 130 supporting radio bearers for the user plane data. At the Physical (PHY) layer, the transport channels may be mapped to Physical channels.
The UEs 115 are dispersed throughout the wireless communications system 100 , and each UE 115 may be stationary or mobile. A UE 115 may also include or be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. A UE 115 may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like. A UE 115 may be able to communicate with various types of base stations and network equipment including macro eNBs/gNBs, small cell eNBs/gNBs, relay base stations, and the like. A UE 115 may also be able to communicate with other UEs either within or outside the same coverage area of a base station via D2D communications.
The communication links 125 shown in wireless communications system 100 may include uplink (UL) transmissions from a UE 115 to a base station 105 , and/or downlink (DL) transmissions, from a base station 105 to a UE 115 . The downlink transmissions may also be called forward link transmissions while the uplink transmissions may also be called reverse link transmissions. Each communication link 125 may include one or more carriers, where each carrier may be a signal made up of multiple sub-carriers (e.g., waveform signals of different frequencies) modulated according to the various radio technologies described above. Each modulated signal may be sent on a different sub-carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, user data, etc. The communication links 125 may transmit bidirectional communications using FDD (e.g., using paired spectrum resources) or TDD operation (e.g., using unpaired spectrum resources). Frame structures for FDD (e.g., frame structure type 1 ) and TDD (e.g., frame structure type 2 ) may be defined. In an exemplary embodiment, the communication links 125 may comprise one or more of an LTE communication link and a millimeter wave (mmW) communication link.
In some embodiments of the system 100 , base stations 105 and/or UEs 115 may include multiple antennas for employing antenna diversity schemes to improve communication quality and reliability between base stations 105 and UEs 115 . Additionally or alternatively, base stations 105 and/or UEs 115 may employ multiple-input, multiple-output (MIMO) techniques that may take advantage of multi-path environments to transmit multiple spatial layers carrying the same or different coded data.
Wireless communications system 100 may support directional synchronization signal for millimeter wave detection and synchronization. For example, a millimeter wave base station 105 may transmit a directional synchronization signal in a sweeping pattern to UEs 115 within its coverage area 110 . The base station 105 may configure a narrowband signal of the synchronization signal to convey correlation information, such as location information (e.g., based on cell ID information included or conveyed in the narrowband signal), for a wideband signal of the synchronization signal. Hereinafter, information regarding the properties of the wideband signal may be referred to as âcorrelation informationâ. The base station 105 may link the wideband signal to the location of the narrowband signal. In some examples, the identification information of the base station 105 may be included or conveyed in the narrowband signal. The identification information may convey the location information, e.g., the UE 115 may perform a function based on the base station 105 identification number and/or access a lookup table. The base station 105 may send the wideband signal component of the synchronization signal according to the correlation information in the narrowband signal.
A UE 115 may receive the narrowband signal of the synchronization signal for the millimeter wave communication network and determine the correlation information associated with the wideband signal from the narrowband signal. For example, the UE 115 may identify the base station 105 sending the narrowband signal, may determine the base station 105 identity based on the frequency of the narrowband signal, etc., to determine the correlation information. The UE 115 may use the correlation information to identify and receive the wideband signal. In some examples, the UE 115 may determine timing information based on the narrowband signal and/or the wideband signal components of the synchronization signal, e.g., system timing, frame boundary/length timing, etc.
In an aspect, the UE 115 is capable of communicating signals via the LTE network and an mmW system (e.g., as a part of a 5G/NR system). Accordingly, the UE 115 may communicate with the base station 105 over a LTE link. Additionally, the UE 115 may communicate with a connection point (CP), a base station (BS) (capable of mmW system communication), or a millimeter wave base station (mmW-BS) 135 over an mmW link.
In a further aspect, at least one of the base stations 105 may be capable of communicating signals via the LTE network and the mmW system over one or more communication links 125 . As such, a base station 135 may be referred to as a LTE+mmW eNB or gNB or as a LTE+mmW CP/BS/mmW-BS.
In an exemplary embodiment, a UE may be operatively coupled to a base station over an LTE/LTE-A communication channel, which may also be referred to as a 4G communication channel. The UE may also be capable of communication using what is referred to as 5G connectivity. In an exemplary embodiment, a 5G communication channel may use mmW access frequencies, on the order of 28 GHz (Gigahertz).
When developed by a low cost frequency source, such as a low cost oscillator having, for example, a 20 part per million (ppm) accuracy over expected temperature variations, a frequency offset may occur at the mmW access frequencies that may be on the order of ten times greater than the frequency offset developed by an oscillator operating at LTE frequencies, on the order of 3 GHz.
In an exemplary embodiment, before establishing a mmW (5G) communication link, a UE may connect to a 4G (LTE) base station and may use at least one 4G timing parameter or synchronization parameter, such as, for example, a 4G frequency reference, to allow the 5G oscillator either to be set accurately to a reference frequency (for example, the 4G frequency reference) or have a negligible frequency offset with respect to the frequency of the 4G frequency reference (i.e., have a negligible frequency offset compared to the frequency inaccuracy that the UE can tolerate without impacting communication quality). Alternatively, the frequency offset of the 5G oscillator may be estimated and the initial frequency established using the frequency of the 4G frequency reference based on the 4G (LTE) connection with the base station. Thus, the effective frequency offset of the 5G oscillator will be significantly reduced from the initial exemplary 20 ppm and appear as an oscillator in a 4G communication device, i.e., an oscillator having a lower frequency offset, for example, a frequency offset on the order of an oscillator having a 20 ppm accuracy operating at 3 GHz. Further, in an exemplary embodiment, a modem in a 5G communication device can learn the temperature dependency of the low cost frequency source used in the 5G oscillator over time and may therefore only rely on the 4G synchronization parameter during an initial learning phase.
Therefore, in a UE capable of both 4G and 5G connectivity, it would be desirable to use one or more of the 4G synchronization parameters, such as a timing reference signal, a synchronization signal, or another 4G timing reference signal, as a starting point for setting a 5G frequency reference for establishing 5G connectivity. For example, various embodiments described herein allow the use of a 4G clock signal, or other 4G timing or synchronization signal, to be used as a beginning reference point for establishing 5G synchronization between a UE and a network.
FIG. 2 is a block diagram 200 of a device 115 - a for use in wireless communication, in accordance with various aspects of the present disclosure. The device 115 - a may be an example of one or more aspects of a UE 115 described with reference to FIG. 1 . The device 115 - a may include a receiver module 205 , a synchronization module 210 , and/or a transmitter module 215 . The device 115 - a may also be or include a processor (not shown). Each of these modules may be in communication with each other.
The components of the device 115 - a may, individually or collectively, be implemented using one or more application-specific integrated circuits (ASICs) adapted to perform some or all of the applicable functions in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, Field Programmable Gate Arrays (FPGAs), and other Semi-Custom ICs), which may be programmed in any manner known in the art. The functions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application-specific processors.
The receiver module 205 may receive information such as packets, user data, and/or control information associated with various information channels (e.g., control channels, data channels, etc.). The receiver module 205 may receive messages from a millimeter wave base station 105 including information associated with synchronization signaling. Information may be passed on to the synchronization module 210 , and to other components of the device 115 - a.
The synchronization module 210 may manage synchronization functions for the device 115 - a . The synchronization module 210 may receive, via the receiver module 205 , a synchronization signal associated with 4G connectivity. For example, the synchronization module 210 may receive a 1 PPS (1 pulse per second) network reference synchronization signal for 4G circuitry associated with the device 115 - a . Alternatively, a clock signal, a frequency reference signal, a frequency offset signal, or other clock and/or timing synchronization signal, that may be internal to the 4G circuitry on the device 115 - a may be provided to 5G circuitry of the device 115 - a to allow the device 115 - a to efficiently achieve 5G synchronization using the 4G clock signal or other 4G synchronization signal.
The transmitter module 215 may transmit the one or more signals received from other components of the device 115 - a . The transmitter module 215 may transmit information such as packets, user data, and/or control information to a serving cell. The transmitter module 215 may send messages to a millimeter wave base station 105 in conjunction with various synchronization signaling operations, e.g., random access procedures. In some examples, the transmitter module 215 may be collocated with the receiver module 205 in a transceiver module.
FIG. 3 is a block diagram 300 of a device 115 - b for use in wireless communication, in accordance with various examples. The device 115 - b may be an example of one or more aspects of a UE 115 described with reference to FIG. 1 . It may also be an example of a device 115 - a described with reference to FIG. 2 . The device 115 - b may include a receiver module 205 - a , a synchronization module 210 - a , and/or a transmitter module 215 - a , which may be examples of the corresponding modules of device 115 - a . The device 115 - b may also include a processor (not shown). Each of these components may be in communication with each other. The synchronization module 210 - a may include a timing reference module 310 . The receiver module 205 - a and the transmitter module 215 - a may perform the functions of the receiver module 205 and the transmitter module 215 , of FIG. 2 , respectively.
The components of the device 115 - b may, individually or collectively, be implemented using one or more application-specific integrated circuits (ASICs) adapted to perform some or all of the applicable functions in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., Structured/Platform ASICs, Field Programmable Gate Arrays (FPGAs), and other Semi-Custom ICs), which may be programmed in any manner known in the art. The functions of each module may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application-specific processors.
The synchronization signal detection module 305 may manage aspects of synchronization signal detection and management for the device 115 - b . The synchronization signal detection module 305 may, in cooperation with the receiver module 205 - a and/or the transmitter module 215 - a , receive a synchronization signal from a communication network or from a base station 105 coupled to a communication network for millimeter wave communications.
In an exemplary embodiment, the synchronization signal detection module 305 may detect a synchronization signal associated with a 4G communication network, and may forward the 4G synchronization signal to the timing reference module 310 . In exemplary embodiments, the synchronization signal associated with a 4G communication network may comprise one or more of a 4G clock signal from which a 1 PPS synchronization signal may be generated and provided to 5G circuitry (not shown), a 4G clock signal that may be propagated from 4G circuitry (not shown) to 5G circuitry (not shown) via an internal interface (such as a peripheral component interconnect-express (PCI-E)) interface, an output of a voltage controlled oscillator (VCO) associated with 4G circuitry (not shown) that may be provided to a VCO associated with 5G circuitry (not shown), or 4G circuitry analyzing a 5G clock signal and adjusting the 5G clock signal based on the analysis. Alternatively, the synchronization signal associated with a 4G communication network may be a frequency reference signal, a frequency offset signal, or other clock and/or timing reference signal.
The timing reference module 310 may manage aspects of synchronization reference timing for the device 115 - b . For example, the timing reference module 310 may, in cooperation with the synchronization signal detection module 305 , determine one or more timing references for the device 115 - b . In an exemplary embodiment, the timing reference module 310 may receive a synchronization signal associated with a 4G communication channel and, using the 4G synchronization signal, establish a timing reference for 5G circuitry (not shown) in the device 115 - b.
FIG. 4 is a block diagram 400 of a device 115 - c for use in wireless communication, in accordance with various examples. The device 115 - c may be an example of one or more aspects of a UE 115 described with reference to FIG. 1 . It may also be an example of a device 115 - a described with reference to FIG. 2 or an example of a device 115 - b described with reference to FIG. 3 . The device 115 - c may include first circuitry, which in this example, may be 4G circuitry 420 and may include second circuitry, which in this example, may be 5G circuitry 430 . The 4G circuitry 420 may be coupled to an antenna 402 and the 5G circuitry 430 may be coupled to an antenna 412 . Although shown as single elements, the antenna 402 and the antenna 412 may comprise one or more antenna elements, may comprise an array, or a phased array, of antenna elements, and may comprise one or more directional and/or omni-directional antenna elements.
In an exemplary embodiment, a base station 105 may include capability to establish a 4G communication channel 403 with the 4G circuitry 420 and may include capability to establish a 5G communication channel 404 with the 5G circuitry 430 . In an exemplary embodiment, a synchronization signal may be communicated from the base station 105 to the device 115 - c via the 4G circuitry 420 , for example, as part of a network reference signal. In an exemplary embodiment, the device 115 - c may have an established 4G communication channel 403 , but may not have an established 5G communication channel 404 . In an exemplary embodiment, if the device 115 - c has an established 4G communication channel 403 and desires to establish a 5G communication channel 404 , the 4G circuitry 420 may be configured to interact with the 5G circuitry 430 to efficiently allow the 5G circuitry 430 to establish a faster acquisition of the 5G communication channel 404 with the base station 105 .
In an exemplary embodiment, the 4G circuitry 420 may provide a timing synchronization parameter (e.g., a timing synchronization signal, a frequency reference signal, a frequency offset signal, or another timing and/or reference signal) to the 5G circuitry 430 . In an exemplary embodiment, the synchronization parameter may be a 1 PPS timing reference signal. In response, the 5G circuitry may process the 1 PPS signal to generate a timing reference signal (e.g., a control signal) that can be used to allow the 5G circuitry to establish a faster acquisition of the 5G communication channel 404 with the base station 105 .
In an exemplary embodiment, the 4G circuitry 420 and the 5G circuitry 430 may communicate over an internal bus or connection, such as a PCI-E internal interface, to allow a counter or register associated with the 4G circuitry 420 to communicate with a counter or register associated with the 5G circuitry 430 . In this way, the 5G circuitry 430 can receive clock or timing information from the 4G circuitry 420 , which allows the 5G circuitry to establish a faster acquisition of the 5G communication channel 404 with the base station 105 .
<div id="p-0064" num="0063" class="description-p
CLAIMS
Claims ( 22 )
What is claimed is:
1. A method for clock synchronization in a communication system having first circuitry coupled to a first communication channel and second circuitry, comprising:
generating a first timing synchronization parameter by the first circuitry, the first timing synchronization parameter associated with a first voltage-controlled oscillator (VCO) operating at a first frequency; and
synchronizing a second VCO associated with the second circuitry to a second communication channel using the first timing synchronization parameter, wherein the second VCO operates at a second frequency, and wherein the first circuitry comprises 4G communication circuitry and the second circuitry comprises 5G communication circuitry.
2. The method of claim 1 , wherein the method further comprises:
calculating a frequency offset based on the first timing synchronization parameter;
developing a control signal based on the frequency offset; and
using the control signal to adjust a timing reference associated with the second communication channel.
3. The method of claim 1 , wherein the first timing synchronization parameter comprises a first timing reference associated with the first communication channel, and the method further comprises:
calculating a frequency offset based on the first timing reference;
developing a control signal based on the frequency offset; and
using the control signal to adjust the second timing reference associated with the second communication channel.
4. The method of claim 1 , wherein the first timing synchronization parameter comprises a first timing reference associated with the first communication channel, and the method further comprises:
providing the first timing reference associated with the first communication channel to the second circuitry as a basis for establishing a second timing reference associated with the second circuitry.
5. The method of claim 1 , wherein the first timing synchronization parameter is generated by the first circuitry based on a network reference signal.
6. The method of claim 3 , further comprising accessing the first timing reference over a communication bus.
7. An apparatus for clock synchronization in a communication system, comprising:
first circuitry coupled to a first communication channel, wherein the first circuitry comprises 4G communication circuitry;
a first voltage-controlled oscillator (VCO) associated with the first circuitry and configured to operate at a first frequency;
second circuitry comprising 5G communication circuitry;
a second VCO associated with the second circuitry and configured to operate at a second frequency; and
a first timing synchronization parameter, associated with the first VCO, generated by the first circuitry and configured to synchronize the second VCO to allow the second circuitry to establish communication with a second communication channel.
8. The apparatus of claim 7 , wherein the apparatus further comprises:
a baseband system configured to calculate a frequency offset based on the first timing synchronization parameter; and
the baseband system configured to develop a control signal based on the frequency offset, wherein the control signal adjusts a timing reference associated with the second communication channel.
9. The apparatus of claim 7 , wherein the first timing synchronization parameter comprises a first timing reference associated with the first communication channel, and the apparatus further comprises:
a baseband system configured to calculate a frequency offset based on the first timing reference; and
the baseband system configured to develop a control signal based on the frequency offset, wherein the control signal adjusts a timing reference associated with the second communication channel.
10. The apparatus of claim 7 , wherein the first timing synchronization parameter comprises a first timing reference associated with the first communication channel, and the apparatus further comprises:
a baseband system configured to provide the first timing reference associated with the first communication channel to the second circuitry as a basis for establishing a second timing reference associated with the second circuitry.
11. The apparatus of claim 7 , wherein the first timing synchronization parameter is generated based on a network reference signal.
12. The apparatus of claim 9 , further comprising a communication bus configured to allow the baseband system to access the first timing reference.
13. A device, comprising:
means for coupling first circuitry to a first communication channel, wherein the first circuitry comprises 4G communication circuitry;
means for generating a first timing synchronization parameter by the first circuitry, the first timing synchronization parameter associated with a first voltage-controlled oscillator (VCO) configured to operate at a first frequency; and
means for synchronizing a second VCO associated with second circuitry to a second communication channel using the first timing synchronization parameter, wherein the second VCO is configured to operate at a second frequency, and wherein the second circuitry comprises 5G communication circuitry.
14. The device of claim 13 , wherein the device further comprises:
means for calculating a frequency offset based on the first timing synchronization parameter;
means for developing a control signal based on the frequency offset; and
means for using the control signal to adjust a timing reference associated with the second communication channel.
15. The device of claim 13 , wherein the first timing synchronization parameter comprises a first timing reference associated with the first communication channel, the device further comprising:
means for calculating a frequency offset based on the first timing reference; and
means for developing a control signal based on the frequency offset; and
means for using the control signal to adjust the second timing reference associated with the second communication channel.
16. The device of claim 13 , wherein the first timing synchronization parameter comprises a first timing reference associated with the first communication channel, and the device further comprises:
means for providing the first timing reference associated with the first communication channel to the second circuitry as a basis for establishing a second timing reference associated with the second circuitry.
17. The device of claim 13 , wherein the first timing synchronization parameter is generated by the first circuitry based on a network reference signal.
18. The device of claim 15 , further comprising means for accessing the first timing reference.
19. A non-transitory computer-readable medium storing computer executable code for clock synchronization in a communication system having first circuitry coupled to a first communication channel and second circuitry, the code executable by a processor to:
generate a first timing synchronization parameter by the first circuitry, the first timing synchronization parameter associated with a first voltage-controlled oscillator (VCO) configured to operate at a first frequency; and
synchronize a second VCO associated with the second circuitry to a second communication channel using the first timing synchronization parameter, wherein the second VCO is configured to operate at a second frequency, and wherein the first circuitry comprises 4G communication circuitry and the second circuitry comprises 5G communication circuitry.
20. The non-transitory computer-readable medium of claim 19 , wherein the code is executable by a processor to:
calculate a frequency offset based on the first timing synchronization parameter;
develop a control signal based on the frequency offset; and
use the control signal to adjust a timing reference associated with the second communication channel.
21. The non-transitory computer-readable medium of claim 19 , wherein the first timing synchronization parameter comprises a first timing reference associated with the first communication channel, and the code is executable by a processor to:
calculate a frequency offset based on the first timing reference;
develop a control signal based on the frequency offset; and
use the control signal to adjust the second timing reference associated with the second communication channel.
22. The non-transitory computer-readable medium of claim 19 , wherein the first timing synchronization parameter comprises a first timing reference associated with the first communication channel, and the code is executable by a processor to:
provide the first timing reference associated with the first communication channel to the second circuitry as a basis for establishing a second timing reference associated with the second circuitry.
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