A SRB transmission method and device

Abstract

The present invention provides an SRB (signaling radio bearer) transmission method and device. According to the configuration, the RLC (radio link layer control) layer UM (unacknowledged) mode is adopted for all or part of the SRB data, thereby avoiding the need to perform LBT (listen before talk) operation for feedback ARQ (automatic repeat request) in AM (acknowledged) mode, thereby reducing the transmission delay of SRB.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to an SRB transmission method and device. Background Art

[0002] Both LTE (Long Term Evolution) and 5G technologies consider the deployment of licensed and unlicensed frequency bands. Among them, LTE's unlicensed technology is designed based on the assumption that the Pcell (primary cell) is on the licensed frequency band. Specifically, SRB (Signaling Radio Bearer) is transmitted on the licensed cell. Therefore, the transmission of SRB can ensure the delay and transmission success rate.

[0003] NR (New Radio) unlicensed technology will also consider implementing Pcell on unlicensed frequency bands. Currently, SRB is configured as AM (acknowledgement) mode in the RLC (Radio Link Control) layer. Since the RLC layer cannot distinguish between SRB and DRB (Data Radio Bearer) data and transmits both together, in AM mode, ARQ (Automatic Repeat-reQuest) requires feedback, and feedback also requires LBT (Listen Before Talk). Therefore, too many LBT operations can easily lead to increased transmission delays in SRB signaling interactions. Summary of the invention

[0004] In view of this, the present invention provides an SRB transmission method and device to shorten the transmission delay of SRB in NR unlicensed frequency band technology.

[0005] On the one hand, an embodiment of the present invention provides an SRB transmission method, the method comprising:

[0006] Depending on the configuration, RLC layer unacknowledged UM mode is used for all or part of the SRB data.

[0007] According to a specific embodiment of the present invention, the adopting of the RLC layer UM mode for all or part of the SRB data according to the configuration includes:

[0008] The RRC layer indicates the SRB data using the RLC layer UM mode, and transmits the indication information to the RLC layer via the PDCP layer.

[0009] According to a specific embodiment of the present invention, the SRB data indicating the use of the RLC layer UM mode includes:

[0010] Carrying identification information of adopting RLC layer UM mode in SRB data; or,

[0011] The SRB data using the RLC layer UM mode is indicated by means of inter-layer primitives.

[0012] According to a specific embodiment of the present invention, the adopting of the RLC layer UM mode for all or part of the SRB data according to the configuration includes:

[0013] The SRB data using the RLC layer UM mode is UM encapsulated at the RLC layer.

[0014] According to a specific embodiment of the present invention, the method further comprises:

[0015] The transmitting end repeatedly transmits the SRB data using the RLC layer UM mode; or,

[0016] The receiving end performs deduplication processing on the SRB data using the RLC layer UM mode.

[0017] According to a specific embodiment of the present invention, the repeated transmission or de-duplication processing is performed at the PDCP layer; or,

[0018] The repetitive transmission or de-duplication process is performed at the RLC layer; or,

[0019] The repeated transmission or de-duplication process is performed at the medium access control MAC layer.

[0020] According to a specific implementation manner of the present invention, the number of repeated transmissions, the information for starting repeated transmissions or deduplication processing, or stopping repeated transmissions or deduplication processing is configured by the base station.

[0021] According to a specific implementation of the present invention, the configuration by the base station includes:

[0022] The number of repeated transmissions, the information for starting repeated transmission or de-duplication processing, or stopping repeated transmission or de-duplication processing is configured by the base station through RRC signaling or MAC signaling.

[0023] On the other hand, the present invention also provides an SRB transmission device, the device comprising:

[0024] Depending on the configuration, the processing unit of the RLC layer UM mode is used for all or part of the SRB data.

[0025] According to a specific embodiment of the present invention, the processing unit includes:

[0026] The indication module is used to indicate the SRB data using the RLC layer UM mode at the RRC layer, and transmit the indication information to the RLC layer via the PDCP layer.

[0027] According to a specific implementation of the present invention, the indication module specifically performs:

[0028] The identification information of adopting the RLC layer UM mode is carried in the SRB data; or, the SRB data adopting the RLC layer UM mode is indicated by means of an inter-layer primitive.

[0029] According to a specific embodiment of the present invention, the processing unit includes:

[0030] The RLC layer module is used to perform UM encapsulation on the SRB data using the RLC layer UM mode at the RLC layer.

[0031] According to a specific embodiment of the present invention, the device further includes: a retransmission unit or a deduplication unit;

[0032] The retransmission unit is used to repeatedly transmit the SRB data using the RLC layer UM mode at the transmitting end;

[0033] The deduplication unit is used to perform deduplication processing on the SRB data using the RLC layer UM mode at the receiving end.

[0034] According to a specific embodiment of the present invention, the retransmission unit or the deduplication unit is implemented at the PDCP layer; or,

[0035] The retransmission unit or the deduplication unit is implemented in the RLC layer; or,

[0036] The retransmission unit or the deduplication unit is implemented at the MAC layer.

[0037] According to a specific implementation manner of the present invention, the number of repeated transmissions, the information for starting repeated transmissions or deduplication processing, or stopping repeated transmissions or deduplication processing is configured by the base station.

[0038] According to a specific implementation of the present invention, the number of repeated transmissions, the information for starting repeated transmission or deduplication processing, or stopping repeated transmission or deduplication processing is configured by the base station through RRC signaling or MAC signaling.

[0039] The present invention also provides a device, comprising

[0040] One or more processors;

[0041] Memory;

[0042] One or more programs, wherein the one or more programs are stored in the memory and the one or more processors execute the operations in the above method.

[0043] The present invention also provides a storage medium containing computer executable instructions, which are used to perform the operations in the above method when executed by a computer processor.

[0044] It can be seen from the above technical solutions that in the method and device provided by the present invention, the RLC layer UM mode is used for all or part of the SRB data, avoiding the need to perform LBT operation for feedback ARQ in the AM mode, thereby reducing the transmission delay of SRB.

[0045] When this method is applied to unlicensed frequency bands, it can improve the efficiency of the NR system operating in unlicensed frequency bands and shorten the delay of the control plane.

[0046] Furthermore, in the present invention, the SRB data using the RLC layer UM mode is repeatedly sent, thereby improving the reliability of signaling transmission and solving the possible signaling loss problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of an SRB transmission method provided in Embodiment 1 of the present invention;

[0048] Figure 2 A schematic diagram of an SRB transmission method provided in Embodiment 2 of the present invention;

[0049] Figure 3 A schematic diagram of an SRB transmission method provided in Embodiment 3 of the present invention;

[0050] Figure 4 A schematic diagram of the structure of an SRB transmission device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] The core idea of ​​the present invention is to adopt RLC layer UM (unacknowledged) mode for all or part of SRB data according to the configuration, avoiding the need to perform LBT operation for feedback ARQ in AM mode, thereby reducing the transmission delay of SRB.

[0053] Among them, the SRB data involved in the embodiment of the present invention may include but is not limited to SRB0, SRB1 and SRB2. SRB0 is mainly used to transmit RRC messages and is transmitted on the logical channel CCCH. SRB1 is mainly used to transmit RRC messages and is transmitted on the logical channel DCCH. SRB2 is mainly used to transmit NAS messages and is transmitted on the logical channel DCCH.

[0054] In addition, in the embodiment of the present invention, whether it is uplink SRB data or downlink SRB data, the RLC layer UM mode can be used for all or part of the SRB data.

[0055] In the embodiment of the present invention, it is possible to pre-configure that the RLC layer UM mode is used for all or part of the SRB data on all carriers, or it is possible to pre-configure that the RLC layer UM mode is used for all or part of the SRB data on a specific carrier, wherein the specific carrier may include but is not limited to an unlicensed carrier.

[0056] In addition, it should be noted that, in the embodiment of the present invention, the same system can simultaneously use the RLC layer UM mode and the AM mode for different SRB data. For example, different carriers can be used to carry SRB data using different modes, or even the same carrier can be used to carry SRB data using different modes, but indication is given for SRB data using the RLC layer UM mode.

[0057] When the RLC layer UM mode is adopted for all or part of the SRB data according to the configuration, it is possible to indicate which SRB data needs to adopt the RLC layer UM mode, so that the RLC layer can adopt the UM mode for these SRB data. Specifically, the following two methods may be adopted but are not limited to:

[0058] The first method: marking the use of the RLC layer UM mode in the SRB data. This method requires that the transmitted SRB data carry identification information, for example, identification information may be carried in the header of the SRB data to identify that the SRB data uses the RLC layer UM mode.

[0059] The second method: indicating the SRB data using the RLC layer UM mode by means of inter-layer primitives. This method does not require any changes to the SRB data itself, but only requires that when the SRB data is transmitted between the protocol layers, the inter-layer primitives transmitted this time are used to indicate that the SRB data uses the RLC layer UM mode.

[0060] If the RLC layer UM mode is used for all or part of the SRB data, in order to improve the reliability of signaling transmission and solve the possible signaling loss problem, the transmitting end can adopt a mechanism of repeatedly sending the SRB data using the RLC layer UM mode. That is, the same SRB data can be sent N times, where N is a pre-configured positive integer. Accordingly, the receiving end can perform deduplication processing on the SRB data using the RLC layer UM mode.

[0061] The above-mentioned repeated transmission can be performed at the PDCP (Packet Data Convergence Protocol) layer of the transmitting end, and correspondingly, the deduplication processing can be performed at the PDCP layer of the receiving end. Alternatively, the above-mentioned repeated transmission can be performed at the RLC layer of the transmitting end, and correspondingly, the deduplication processing can be performed at the RLC layer of the receiving end. Alternatively, the above-mentioned repeated transmission can be performed at the MAC (Media Access Control) layer of the transmitting end, and correspondingly, the deduplication processing can be performed at the MAC layer of the receiving end. The specific protocol layer to be performed can be pre-configured.

[0062] Here are a few examples:

[0063] Embodiment 1

[0064] like Figure 1 As shown in , the transmitting end indicates the generated SRB data at the RRC layer, and one of the above two methods can be used, that is, the method of carrying identification information in the SRB data can be used, or the method of inter-layer primitives can be used to indicate that the SRB data adopts the RLC layer UM mode. If the former is adopted, the identification information can be carried in the data packet header of the SRB data to indicate that the SRB data adopts the RLC layer UM mode. The PDCP layer determines that the SRB data needs to adopt the RLC layer UM mode based on the identification information carried by the packet header of the SRB data. In this embodiment, the repeated transmission mechanism is pre-configured at the PDCH layer, and the SRB data is repeatedly sent N times at the PDCP layer. Assuming that N is 2, the PDU (Protocol Data Unit) formed by the SRB data is transmitted twice to the RLC layer. The RLC layer performs UM encapsulation on the received PDU. Correspondingly, the PDCP layer at the receiving end performs deduplication processing on the SRB data, that is, after the RLC layer passes the RLC (including SRB data) data to the PDCP layer, the PDCP layer performs data deduplication processing.

[0065] Embodiment 2

[0066] like Figure 2As shown in , the transmitting end indicates the generated SRB data at the RRC layer, and one of the above two methods can also be used, that is, the method of carrying identification information in the SRB data can be used, or the inter-layer primitive method can be used to indicate that the SRB data adopts the RLC layer UM mode. The indication is passed to the RLC layer via the PDCP layer, for example, by carrying identification information in the header of the data packet encapsulated in each layer. In this embodiment, the RLC layer is pre-configured to perform a repeated transmission mechanism, and the RLC layer performs UM encapsulation on the received PDU (that is, the PDU formed by the SRB data) and repeats it N times. Assume that N is 2, that is, the PDU formed by the SRB data is UM-encapsulated and sent twice. Accordingly, the RLC layer at the receiving end performs deduplication processing on the SRB data.

[0067] Embodiment 3

[0068] like Figure 3 As shown in , the transmitting end indicates the generated SRB data at the RRC layer, and one of the above two methods can also be used, that is, the method of carrying identification information in the SRB data can be used, or the method of inter-layer primitives can be used to indicate that the SRB data adopts the RLC layer UM mode. The indication is passed to the MAC layer via the PDCP layer and the RLC layer, for example, by carrying identification information in the header of the data packet encapsulated in each layer. In addition, the PDU formed by the SRB data is UM encapsulated at the RLC layer. In this embodiment, the MAC layer is pre-configured to execute a repeated transmission mechanism, that is, when neither the PDCP nor the RLC layer supports repeated transmission, repeated transmission can be performed at the MAC, and the received SRB data is sent N times at the MAC layer according to the indication. Assuming N is 2, it is repeated twice at the MAC layer. Accordingly, if the MAC layer at the receiving end receives repeated SRB data, the SRB data is deduplicated.

[0069] It should be noted that, in the above embodiments, the LBT mechanism may be used each time a retransmission is performed.

[0070] In the above embodiments, the base station can configure the number of repeated transmissions N, the base station can configure the start of repeated transmission or deduplication processing, and the base station can configure the stop of repeated transmission or deduplication processing. Specifically, the base station can use but is not limited to RRC signaling or MAC signaling to configure the above content.

[0071] The above is a description of the method provided by the present invention. The following is a detailed description of the device provided by the present invention in conjunction with embodiments.

[0072] Figure 4 A structural diagram of an SRB transmission device provided in an embodiment of the present invention is shown in FIG. Figure 4As shown, the device may include: a processing unit 10, and may also include a retransmission unit 20 or a deduplication unit 30. The main functions of each component unit are as follows:

[0073] The processing unit 10 is responsible for adopting the RLC layer UM mode for all or part of the SRB data according to the configuration. The SRB data involved may include but is not limited to SRB0, SRB1 and SRB2. Moreover, whether it is uplink SRB data or downlink SRB data, the RLC layer UM mode can be adopted for all or part of the SRB data.

[0074] It may be pre-configured that the RLC layer UM mode is used for all or part of the SRB data on all carriers, or it may be pre-configured that the RLC layer UM mode is used for all or part of the SRB data on a specific carrier, wherein the specific carrier may include but is not limited to an unlicensed carrier.

[0075] Specifically, the processing unit 10 may include an indication module 11, which is used to indicate the SRB data using the RLC layer UM mode, which may be in the following two ways but not limited to:

[0076] The first method: marking the use of the RLC layer UM mode in the SRB data. This method requires that the transmitted SRB data carry identification information, for example, identification information may be carried in the header of the SRB data to identify that the SRB data uses the RLC layer UM mode.

[0077] The second method: indicating the SRB data using the RLC layer UM mode by means of inter-layer primitives. This method does not require any changes to the SRB data itself, but only requires that when the SRB data is transmitted between the protocol layers, the inter-layer primitives transmitted this time are used to indicate that the SRB data uses the RLC layer UM mode.

[0078] The above-mentioned indication module 11 can be implemented at the RRC layer and the PDCP layer. Specifically, the generated SRB data can be indicated at the RRC layer, and the indication method can adopt one of the above-mentioned two methods, and then the indication is passed to the RLC layer through the PDCP layer. If the above-mentioned first method is adopted, when the RRC layer performs protocol encapsulation on the SRB data, the identification information of the SRB data using the RLC layer UM mode can be encapsulated in the data header, and the PDCP layer, based on the identification information, also encapsulates the SRB data in the data header using the RLC layer UM mode when performing protocol encapsulation and passing it to the next layer. If the above-mentioned second method is adopted, when the RRC layer passes data to the PDCP layer, the inter-layer primitives transmitted this time are used to indicate that the SRB data adopts the RLC layer UM mode; similarly, when the PDCP layer passes data to the RLC layer, the inter-layer primitives transmitted this time are used to indicate that the SRB data adopts the RLC layer UM mode.

[0079] In addition, the processing unit 10 further comprises: an RLC layer module 12, configured to perform UM encapsulation on the SRB data using the RLC layer UM mode at the RLC layer.

[0080] In addition, if the RLC layer UM mode is used for all or part of the SRB data, in order to improve the reliability of signaling transmission and solve the possible signaling loss problem, if the device is located at the transmitting end, it may also include: a retransmission unit 20; if the device is located at the receiving end, the device may also include a deduplication unit (not shown in the figure).

[0081] The retransmission unit 20 is responsible for repeatedly transmitting the SRB data in the RLC layer UM mode at the transmitting end, that is, the same SRB data can be transmitted N times, where N is a pre-configured positive integer.

[0082] The deduplication unit performs deduplication processing on the SRB data using the RLC layer UM mode at the receiving end.

[0083] The above-mentioned retransmission unit 20 and deduplication unit may be implemented at the PDCP layer; or, the retransmission unit 20 and deduplication unit may be implemented at the RLC layer; or, the retransmission unit 20 and deduplication unit may be implemented at the MAC layer.

[0084] The number of repeated transmissions, the information for starting repeated transmission or deduplication processing, or stopping repeated transmission or deduplication processing can be configured by the base station, that is, the retransmission unit 20 and the deduplication unit can start repeated transmission and deduplication processing, stop repeated transmission and deduplication processing, and determine the number of repeated transmissions according to the configuration of the base station.

[0085] More specifically, the number of repeated transmissions, the information for starting repeated transmission or deduplication processing, or stopping repeated transmission or deduplication processing can be configured by the base station through RRC signaling or MAC signaling.

[0086] The above method and apparatus provided in the embodiments of the present invention may be implemented in the form of one or more integrated circuits such as codec chips, or may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium. Each unit in the above embodiment may be implemented in the form of hardware or in the form of a software functional module. The present invention does not limit any specific form of the combination of hardware and software.

[0087] For example, it can be implemented by a device, which includes:

[0088] One or more processors;

[0089] Memory;

[0090] One or more programs, the one or more programs are stored in the memory and are executed by the one or more processors to implement the following operations:

[0091] Depending on the configuration, RLC layer UM mode is used for all or part of the SRB data.

[0092] In addition, with the development of time and technology, the meaning of medium is becoming more and more extensive, and the dissemination path of the program is no longer limited to tangible media, and it can also be downloaded directly from the network. Any combination of one or more computer-readable media can be used. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, - but not limited to - electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples of computer-readable storage media (non-exhaustive list) include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing programs, which can be used by or in combination with instruction execution systems, devices or devices.

[0093] Computer-readable signal media may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A signaling radio bearer (SRB) transmission method, characterized in that: The method includes: Depending on the configuration, the radio link layer control protocol RLC layer unacknowledged UM mode is used for all or part of the SRB data. Wherein, according to the configuration, adopting the RLC layer UM mode for all or part of the SRB data includes: carrying identification information adopting the RLC layer UM mode in a packet header of the SRB data, indicating the SRB data adopting the RLC layer UM mode at the RRC layer, and transmitting the identification information to the RLC layer via the Packet Data Convergence Protocol PDCP layer, The method further comprises: Determining, by the PDCP layer, the SRB data that needs to adopt the RLC layer UM mode according to the identification information carried in the packet header of the SRB data; and The SRB data using the UM mode of the RLC layer is repeatedly sent at the PDCP layer.

2. The method according to claim 1, characterized in that: The adopting of the RLC layer UM mode for all or part of the SRB data according to the configuration also includes: The SRB data using the RLC layer UM mode is UM encapsulated at the RLC layer.

3. The method according to claim 1, characterized in that: The number of repeated transmissions, the information for starting repeated transmissions, or stopping repeated transmissions is configured by the base station.

4. The method according to claim 3, characterized in that The configuration by the base station includes: The number of repeated transmissions, the information for starting repeated transmissions, or stopping repeated transmissions is configured by the base station through RRC signaling or MAC signaling.

5. A signaling radio bearer (SRB) transmission device, characterized in that: The device includes: Depending on the configuration, the processing unit of the RLC layer UM mode is used for all or part of the SRB data. The processing unit comprises: an indication module, configured to indicate at the RRC layer the SRB data using the RLC layer UM mode by carrying identification information of using the RLC layer UM mode in a packet header of the SRB data, and transmitting the identification information to the RLC layer via the Packet Data Convergence Protocol PDCP layer, The device also includes: A retransmission unit is used to determine, through the PDCP layer, the SRB data that needs to adopt the RLC layer UM mode according to the identification information carried in the packet header of the SRB data; and to repeatedly transmit the SRB data that adopts the RLC layer UM mode at the PDCP layer.

6. The device according to claim 5, characterized in that The processing unit also includes: The RLC layer module is used to perform UM encapsulation on the SRB data using the RLC layer UM mode at the RLC layer.

7. The device according to claim 5, characterized in that The number of repeated transmissions, the information for starting repeated transmissions, or stopping repeated transmissions is configured by the base station.

8. The device according to claim 7, characterized in that The number of repeated transmissions, the information for starting repeated transmissions, or stopping repeated transmissions is configured by the base station through RRC signaling or MAC signaling.

9. A signaling radio bearer (SRB) transmission device, comprising One or more processors; Memory; One or more programs, the one or more programs are stored in the memory, and the one or more processors execute the operations in the method according to any one of claims 1 to 4.

10. A storage medium comprising computer executable instructions, which when executed by a computer processor are used to perform the operations of the method as claimed in any one of claims 1 to 4.

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