WO2023213267A1 - 由用户设备执行的方法及用户设备 - Google Patents
由用户设备执行的方法及用户设备 Download PDFInfo
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- WO2023213267A1 WO2023213267A1 PCT/CN2023/092018 CN2023092018W WO2023213267A1 WO 2023213267 A1 WO2023213267 A1 WO 2023213267A1 CN 2023092018 W CN2023092018 W CN 2023092018W WO 2023213267 A1 WO2023213267 A1 WO 2023213267A1
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- remote
- user equipment
- message
- srap
- relay
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- 102100023706 Steroid receptor RNA activator 1 Human genes 0.000 claims abstract description 46
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- 230000011664 signaling Effects 0.000 claims abstract description 14
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- 238000004891 communication Methods 0.000 claims description 24
- 108091005487 SCARB1 Proteins 0.000 claims description 15
- 102100037118 Scavenger receptor class B member 1 Human genes 0.000 claims description 15
- 101001055444 Homo sapiens Mediator of RNA polymerase II transcription subunit 20 Proteins 0.000 claims description 14
- 102100026165 Mediator of RNA polymerase II transcription subunit 20 Human genes 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 13
- 238000013507 mapping Methods 0.000 claims description 10
- 230000000977 initiatory effect Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
Definitions
- the present invention relates to the field of wireless communication technology, and more specifically, the present invention relates to a method executed by user equipment and the corresponding user equipment.
- a user equipment can communicate with another user equipment through a relay user equipment (relay UE).
- relay UE A UE that communicates via relay UE is called a remote UE (remote UE).
- initiating UE initiating UE
- target UE target UE
- source UE source UE
- destination UE destination UE
- the initiating UE and the target UE can communicate based on the PC5 interface. Before the connection is established, PC5-S messages need to be exchanged. How to implement the correct routing of these PC5-S messages by the relay UE is a problem that needs to be solved.
- the present invention provides a method executed by user equipment and user equipment.
- a method performed by user equipment is provided, which is a method performed during sidelink communication between one user equipment UE and another UE through a relay UE, wherein, via the relay UE The two UEs communicating are remote UEs.
- the above method includes the following steps:
- the upper layer of the remote UE requests to transmit the PC5-S message or requests the sidelink communication SRB for transmitting the PC5-S message.
- the upper layer is above the RRC layer, and the PC5-S message is a message based on the PC5 signaling protocol stack;
- the RRC layer of the remote UE establishes the corresponding PDCP entity, RLC entity, and sidelink communication logical channel for the transmission of the PC5-S message;
- the remote UE determines whether the SRB is a remote UE used for the sidelink communication layer 2 relay architecture, Or it is used for PC5-S messages between end-to-end remote UEs in relay scenarios,
- the remote UE applies SRAP Configuration, wherein applying the SRAP configuration at least includes establishing the SRAP entity.
- the RRC layer establishes different SRBs
- SRB0 is used to transmit PC5-S messages to be transmitted before the PC5-S security mechanism is established;
- SRB1 is used to transmit PC5-S messages used to establish security mechanisms
- SRB2 is used to transmit PC5-S messages to be transmitted after the PC5-S security mechanism is established.
- SRAP configuration is specified in advance.
- SRAP configuration includes at least one of the following information:
- mapping relationship in the list is:
- SRB0 is mapped to the PC5 RLC channel with logical channel identifier X;
- SRB1 is mapped to the PC5 RLC channel with logical channel identifier Y;
- SRB2 is mapped to the PC5 RLC channel with logical channel identifier Z.
- X, Y, and Z are the same, or the three are different, or two of them are the same.
- the remote UE further determines which SRB among SRB0, SRB1, and SRB2 the SRB is.
- the remote UE releases the corresponding PDCP entity, RLC entity and logical channel,
- the remote UE If SRAP has been established, the remote UE also releases the corresponding SRAP entity.
- a user equipment including:
- the above instructions when executed by the above processor, cause the above user equipment to perform the method according to the above description.
- Figure 1 is a schematic diagram showing UE-to-UE relay.
- Figure 2 is a schematic diagram showing PC5 connection establishment.
- Figure 3 is a schematic diagram showing the control plane protocol stack of the UE-to-UEL2 architecture.
- FIG. 4 shows a method executed by user equipment UE according to an embodiment of the present invention.
- Figure 5 is a schematic structural block diagram of the user equipment UE involved in the present invention.
- UE User Equipment user equipment
- MAC CE MAC control element
- RLC Radio Link Control wireless link control
- SDAP Service Data Adaptation Protocol Service Data Adaptation Protocol
- PDCP Packet Data Convergence Protocol packet data convergence protocol
- SRAP Sidelink Relay Adaptation Protocol
- Sidelink Relay Adaptation Protocol Sidelink Relay Adaptation Protocol
- RRC Radio Resource Control Radio Resource Control
- RRC_IDLE RRC idle state
- RAN Radio Access Network, wireless access network
- SCI Sidelink Control Information, sidelink communication control information
- MIB Master Information Block, master information block
- SIB System Information Block, system information block
- NG-RAN NG Radio Access Network, a new generation of wireless access network
- DCI Downlink Control Information, downlink control information
- ADAPT Adaptation layer, sidelink communication adaptation layer
- PHY physicallayer, physical layer
- RB radiobearer, wireless bearer
- DRB Data Radio Bearer, data wireless bearer
- SRB Signalling Radio Bearer, signaling wireless bearer
- SDU Service Data Unit service data unit
- V2X Vehicle-to-Everything Internet of Vehicles
- CCCH Common Control Channel public control channel
- DCCH Dedicated Control Channel proprietary control channel
- the user equipment UE may be an NR device that supports NR Sidelink relay function, may also refer to an NR device that supports NR sidelink relay architecture, or may refer to other types of NR equipment or LTE equipment.
- sidelink and PC5 can be used interchangeably, and RLC channel, RLC entity and RLC bearer can be used interchangeably.
- the UE-to-UE relay is shown in Figure 1.
- the left side is the remote UE UE-1
- the middle is the relay UE (Relay UE)
- the right side is the remote UE UE-2;
- UE-1 and the relay UE They are connected through the PC5 interface, and the relay UE and UE-2 are connected through the PC5 interface.
- the relay UE needs to relay and forward the signaling and data between them. According to their roles in communication, one of them can be called the initiating UE (initiating UE) and the other is the target UE (target UE), or one of them is the source UE (source UE) and the other is the destination UE ( destination UE).
- UE-1 in order to establish the PC5 connection, UE-1 sends a message (1) Direct link establishment request (Direct link establishment request) to UE-2 through SRB0,
- UE-2 After receiving the message (1), UE-2 starts the security mode and sends the message (2) direct security mode command (Direct security mode command) to UE-1 through SRB1.
- direct security mode command Direct security mode command
- Direct security mode complete (Direct security mode complete).
- UE-2 Through message (2) and message (3), a security mechanism is established between UE-1 and UE-2. If UE-2 accepts the connection establishment request of UE-1, then UE-2 can reply message (4) Direct link establishment accept (Direct link establishment accept) to UE-1 through SRB2. If UE-2 does not accept the establishment request of UE-1, it can reply message (5) Direct link establishment reject (Direct link establishment reject) through SRB2.
- Direct link establishment accept Direct link establishment accept
- SRB2 Direct link establishment reject
- the PC5 connection between UE-1 and UE-2 is successfully established.
- the UE (UE-1 and UE-2) will indicate that the UE
- the lower layer establishes the PC5 RRC connection establishment, and then the UE will establish the corresponding PDCP entity, RLC entity and SRB3 for PC5 RRC message transmission, and then determines that the PC5 RRC connection establishment is completed.
- the messages (1)-(5) described here are messages based on the PC5 signaling (PC5signalling) protocol stack and can be called PC5-S messages (PC5-S message)
- the UE establishes SRB for the transmission of PC5-S messages, and different PC5-S messages are uploaded in different types of SRBs.
- the RRC layer of the UE When the UE needs to deliver the PC5-S message, if the corresponding SRB is not established, then the UE When the upper layer of the UE requests to transmit the PC5-S message or requests the sidelink SRB for transmitting the PC5-S message, the RRC layer of the UE will establish the corresponding PDCP entity, RLC entity, and sidelink logical channel for the transmission of the PC5-S message. . Depending on the type of PC5-S message, the RRC layer establishes different SRBs. For example,
- SRB0 is used to transmit PC5-S messages that need to be transmitted before the PC5-S security mechanism is established, such as message (1);
- SRB1 is used to transmit PC5-S messages used to establish the security mechanism, such as message (2) and message ( 3);
- SRB2 is used to transmit PC5-S messages that need to be transmitted after the PC5-S security mechanism is established, such as message (4) and message (5).
- the control plane protocol stack of remote UE and relay UE based on the sidelink communication layer two (L2) relay architecture is shown in Figure 3.
- the source UE on the left and the destination UE on the right are both remote UEs, and the middle is a relay UE.
- the source UE in the Remote UE selects a relay UE to provide relay services for itself, it will establish a PC5 connection (PC5link) with the relay UE to communicate with the destination UE through the relay UE.
- PC5link PC5 connection
- destination UE also needs to establish a PC5 connection with relayUE.
- the PC5 interface is the wireless communication interface between Remote UE and relay UE.
- Remote UE and relay UE communicate through sidelink (sidelink).
- the communication interface of the sidelink is the PC5 interface, so the descriptions of sidelink and PC5 can be interchanged in this article.
- PC5 RLC entity refers to the RLC entity used for PC5 interface communication.
- the PC5 RLC entity carries the information from the Uu PDCP entity, so such a PC5 RLC entity can also be called a PC5 RLC bearer.
- PC5 SRAP entity refers to the SRAP entity used for PC5 interface communication.
- the PC5 SRAP on the remote UE side determines to send the initiating UE according to the configured mapping relationship between the bearer and the PC5 RLC. Which PC5 RLC channel(s) the data for the destination UE is delivered to.
- PC5SRAP determines which bearer or bearers to submit the received data sent by the initiating UE to the destination UE based on the configured mapping relationship between the PC5 RLC channel and the bearer.
- PC5 SRAP entity corresponding to the remote UE side in the relay UE.
- This embodiment provides a method performed by user equipment UE, which is a method performed during sidelink communication between one UE and another UE through a relay UE, where the two UEs communicating through the relay UE are called for the remote UE.
- Embodiment 1 provides a method implemented on the remote UE side.
- the above method includes the following steps:
- Step S401 The upper layers of the remote UE request to transmit the PC5-S message, or request the sidelink SRB for transmitting the PC5-S message.
- the upper layer here usually refers to the RRC layer and above.
- the PC5-S message here is a message based on the PC5 signaling (PC5signalling) protocol stack.
- the RRC layer establishes different SRBs according to the type of PC5-S message. For example,
- SRB0 is used to transmit PC5-S messages to be transmitted before the PC5-S security mechanism is established;
- SRB1 is used to transmit PC5-S messages used to establish security mechanisms
- SRB2 is used to transmit PC5-S messages to be transmitted after the PC5-S security mechanism is established.
- Step S402 Based on the request, the RRC layer of the remote UE will establish the corresponding PDCP entity, RLC entity, and sidelink logical channel for the transmission of the PC5-S message.
- Step S403 The remote UE further determines whether the SRB is used for L2 U2U remote UE, or is used for PC5-S messages between end-to-end remote UEs in relay scenarios.
- the remote UE applies the SRAP configuration, where applying the SRAP configuration at least includes establishing a SRAP entity.
- the SRAP configuration may be specified in advance, and may also include one or more of the following information:
- the end-to-end bearer identifier value preferably includes the value of the signaling bearer identifier, such as a signaling bearer with a value of 0, that is, SRB0, or a signaling bearer with a value of 1 or 2, that is, SRB1 or SRB2;
- the RLC channel at the PC5 interface preferably can be the output RLC channel (Egress RLC channel) at the PC5 interface.
- the output RLC channel is the PC5 RLC through which the remote UE sends data packets (data packets) to the relay UE. Channel; or the input RLC channel (Ingress RLC channel) at the PC5 interface, which is the PC5 RLC channel used by the remote UE to receive data packets from the relay UE;
- mapping relationship in the list can be:
- SRB0 is mapped to the PC5 RLC channel with logical channel identifier X;
- SRB1 is mapped to the PC5 RLC channel with logical channel identifier Y;
- SRB2 is mapped to the PC5 RLC channel with logical channel identifier Z.
- the remote UE can further determine which SRB the SRB is. For example, when the SRB is SRB0, perform the above operations, or when the SRB is SRB1, perform the above operations, or when the SRB is SRB2, perform the above operations. .
- Specific implementation methods may be:
- the RRC layer of the remote UE will establish the corresponding PDCP entity, RLC entity, and sidelink logical channel for the transmission of the PC5-S message.
- the SRB is used for L2 U2U remote UE, or is used for PC5-S messages between end-to-end remote UEs in relay scenarios, and is SRB1, the SRAP configuration is applied.
- Embodiment 1 can be used for remote UEs at both ends of L2 U2U, including initiating UE and destination UE.
- the data packet from above the SRAP layer will be sent to the SRAP entity.
- the UE can add SRAP header (SRAP Header) forms SRAP PDU (packet data unit).
- SRAP header carries destination information and end-to-end bearer information, and then according to the mapping relationship in the SRAP configuration, the SRAP PDU is submitted to the corresponding PC5 RLC channel under the SRAP layer for transmission.
- the received SRAP PDU will have the SRAP header removed and sent to the corresponding PDCP entity/end-to-end bearer based on the bearer information in the header.
- Embodiment 2 provides a method implemented on the relay UE side.
- Applying SRAP configuration at least includes establishing a SRAP entity, where the SRAP configuration can be specified in advance, and can also include one or more of the following information:
- the end-to-end bearer identifier value preferably includes the value of the signaling bearer identifier, such as a signaling bearer with a value of 0, that is, SRB0, or a signaling bearer with a value of 1 or 2, that is, SRB1 or SRB2;
- the input RLC channel here can be the RLC channel used by relay UE to receive data packets from remote UE;
- the output RLC channel (Egress RLC channel) at the PC5 interface, such as the channel identifier.
- the output RLC channel here can be the RLC channel through which relay UE sends data packets to remote UE;
- mapping relationship between the input RLC channel and the output RLC channel For example, a data packet with the bearer ID 0 and the input RLC channel ID M will be delivered to the output RLC channel with the channel ID value N.
- the UE when the upper layers of the UE stop transmitting the PC5-S message, the UE will release the corresponding PDCP entity, RLC entity and logical channel. If SRAP has been established, then the corresponding SRAP entity needs to be released. .
- FIG. 5 is a schematic structural block diagram of the user equipment UE involved in the present invention.
- the user equipment UE500 includes a processor 501 and a memory 502.
- the processor 501 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like.
- the memory 502 may include, for example, volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory.
- Memory 502 stores program instructions. When this instruction is executed by the processor 501, it can execute the above-mentioned steps executed by the user equipment as described in detail in the present invention. method.
- the program running on the device according to the present invention may be a program that causes the computer to implement the functions of the embodiments of the present invention by controlling a central processing unit (CPU).
- the program or information processed by the program may be temporarily stored in volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory systems.
- Programs for realizing the functions of each embodiment of the present invention can be recorded on a computer-readable recording medium.
- Corresponding functions can be realized by causing the computer system to read programs recorded on the recording medium and execute these programs.
- the so-called “computer system” here may be a computer system embedded in the device, which may include an operating system or hardware (such as peripheral devices).
- the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a short-term dynamic storage program recording medium, or any other recording medium readable by a computer.
- circuits eg, single-chip or multi-chip integrated circuits.
- Circuitry designed to perform the functions described in this specification may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above.
- DSP digital signal processor
- ASIC application-specific integrated circuit
- FPGA field-programmable gate array
- a general-purpose processor can be a microprocessor or any existing processor, controller, microcontroller, or state machine.
- the above circuit may be a digital circuit or an analog circuit.
- the present invention is not limited to the above-described embodiment. Although various examples of the embodiments have been described, the invention is not limited thereto.
- Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.
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Abstract
本发明提供一种由用户设备执行的方法及用户设备,该方法包括如下步骤:远端UE的上层请求传输PC5-S消息或者请求用于传输PC5-S消息的侧行链路通信SRB,该上层为RRC层以上,该PC5-S消息是基于PC5信令协议栈的消息;基于该请求,远端UE的RRC层建立相应的PDCP实体、RLC实体、侧行链路通信逻辑信道用于该PC5-S消息的传输;以及远端UE判断该SRB是否是用于侧行链路通信层二中继架构的远端UE,或者是用于中继场景下端到端的远端UE之间的PC5-S消息,如果判断为是,那么远端UE应用SRAP配置,其中,应用SRAP配置至少包括建立SRAP实体。
Description
本发明涉及无线通信技术领域,更具体地,本发明涉及由用户设备执行的方法以及相应的用户设备。
一个用户设备(User equipment,UE)可以通过中继用户设备(relay UE)与另外一个用户设备进行通信。经由relay UE进行通信的UE被称为远端UE(remote UE)。根据它们在通信中的角色,可以称其中一个为initiating UE(启动UE),另外一个为target UE(目标UE),又或者是其中一个为source UE(源UE),另外一个为destination UE(目的地UE)。
Initiating UE和target UE之间可以基于PC5接口进行通信,那么在连接建立之前,需要进行PC5-S消息的交互,如何实现relay UE对这些PC5-S消息的正确路由,是需要解决的问题。
发明内容
为了解决上述问题,本发明提供一种由用户设备执行的方法以及用户设备。
根据本发明的一个方面,提供了一种由用户设备执行的方法,是一个用户设备UE通过中继UE与另外一个UE进行侧行链路通信的过程中执行的方法,其中,经由中继UE进行通信的两个UE为远端UE,上述方法包括如下步骤:
远端UE的上层请求传输PC5-S消息或者请求用于传输PC5-S消息的侧行链路通信SRB,该上层为RRC层以上,该PC5-S消息是基于PC5信令协议栈的消息;
基于该请求,远端UE的RRC层建立相应的PDCP实体、RLC实体、侧行链路通信逻辑信道用于该PC5-S消息的传输;以及
远端UE判断该SRB是否是用于侧行链路通信层二中继架构的远端UE,
或者是用于中继场景下端到端的远端UE之间的PC5-S消息,
如果判断为该SRB是用于侧行链路通信层二中继架构的远端UE,或者是用于中继场景下端到端的远端UE之间的PC5-S消息,那么远端UE应用SRAP配置,其中,应用SRAP配置至少包括建立SRAP实体。
在上述的由用户设备执行的方法中,优选地,
根据PC5-S消息的类型,RRC层建立不同的SRB,
SRB0用于传输在PC5-S安全机制建立之前要传输的PC5-S消息;
SRB1用于传输用于建立安全机制的PC5-S消息;
SRB2用于传输在PC5-S安全机制建立之后要传输的PC5-S消息。
在上述的由用户设备执行的方法中,优选地,
SRAP配置是事先规定的。
在上述的由用户设备执行的方法中,优选地,
SRAP配置包括下述信息中的至少一者:
端到端的承载标识取值;
PC5接口处的RLC信道;
承载标识和RLC信道的映射列表。
在上述的由用户设备执行的方法中,优选地,
列表中的映射关系是:
SRB0映射到逻辑信道标识为X的PC5 RLC信道;
SRB1映射到逻辑信道标识为Y的PC5 RLC信道;
SRB2映射到逻辑信道标识为Z的PC5 RLC信道。
在上述的由用户设备执行的方法中,优选地,
X、Y、Z的取值是三者相同、或者是三者不同、或者是其中两者相同。
在上述的由用户设备执行的方法中,优选地,还包括如下步骤:
远端UE进一步判断该SRB是SRB0、SRB1、SRB2中的哪一个SRB。
在上述的由用户设备执行的方法中,优选地,
当远端UE的上层中止传输PC5-S消息时,
远端UE释放相应的PDCP实体、RLC实体以及逻辑信道,
如果SRAP已经建立了,那么远端UE还释放相应的SRAP实体。
根据本发明的另一个方面,提供了一种用户设备,包括:
处理器;以及
存储器,上述存储器上存储有指令,
上述指令在由上述处理器运行时,使上述用户设备执行根据上文所描述的方法。
根据本发明所涉及的由用户设备执行的方法以及相应的用户设备,通过进行PC5-S消息的交互,从而能够实现relay UE对这些PC5-S消息的正确路由。
图1是表示UE-to-UE中继的示意图。
图2是表示PC5连接建立的示意图。
图3是表示UE-to-UEL2架构控制面协议栈的示意图。
图4是表示本发明的一实施例涉及的用户设备UE执行的方法。
图5是本发明涉及的用户设备UE的简要结构框图。
下面结合附图和具体实施方式对本发明进行详细阐述。应当注意,本发明不应局限于下文所述的具体实施方式。另外,为了简便起见,省略了对与本发明没有直接关联的公知技术的详细描述,以防止对本发明的理解造成混淆。
下面描述本发明涉及的部分术语,术语的具体含义见3GPP最新标准规范。
UE:User Equipment用户设备
NR:New Radio新一代无线技术
MAC:Medium Access Control多媒体接入控制
MAC CE:MAC control element MAC控制元素
RLC:Radio Link Control无线链路控制
SDAP:Service Data Adaptation Protocol服务数据适配协议
PDCP:Packet Data Convergence Protocol分组数据汇聚协议
SRAP:Sidelink Relay Adaptation Protocol侧行链路中继适配协议
RRC:Radio Resource Control无线资源控制
RRC CONNECTED:RRC连接态
RRC INACTIVE:RRC非激活态
RRC_IDLE:RRC空闲态
RAN:Radio Access Network,无线接入网络
Sidelink:侧行链路通信
SCI:Sidelink Control Information,侧行链路通信控制信息
AS:Access Stratum,接入层
IE:Information Element,信息元素
CE:Control Element,控制元素
MIB:Master Information Block,主信息块
SIB:System Information Block,***信息块
NG-RAN:NG Radio Access Network,新一代无线接入网络
DCI:Downlink Control Information,下行控制信息
ADAPT:Adaptation layer,侧行链路通信适配层
PHY:physicallayer,物理层
RB:radiobearer,无线承载
DRB:Data Radio Bearer,数据无线承载
SRB:Signalling Radio Bearer,信令无线承载
PDU:Protocol Data Unit协议数据单元
SDU:Service Data Unit服务数据单元
V2X:Vehicle-to-Everything车联网
CCCH:Common Control Channel公共控制信道
DCCH:Dedicated Control Channel专有控制信道
本发明中,用户设备UE可以是支持NR Sidelink中继功能的NR设备,也可以指支持NR sidelink中继架构的NR设备,也可以指其他类型的NR设备或者LTE设备。
本发明中,sidelink和PC5可以互换使用,RLC信道(channel)、RLC实体和RLC承载(bearer)可以互换使用。
以下,对本发明的相关技术给出说明。
UE-to-UE中继如图1所示,左侧为远端UE UE-1,中间为中继UE(Relay UE),右侧为远端UE UE-2;UE-1和中继UE之间通过PC5接口连接,中继UE和UE-2之间通过PC5接口连接。由于UE-1和UE-2之间距离较远或者通信环境不佳,需要中继UE对两者间的信令和数据进行中继转发。根据它们在通信中的角色,可以称其中一个为启动UE(initiating UE),另外一个为目标UE(target UE),又或者是其中一个为源UE(source UE),另外一个为目的地UE(destination UE)。
PC5连接(PC5 connection/link)的建立
如图2所示,为了建立PC5连接,UE-1通过SRB0向UE-2发送消息(1)直接连接建立请求(Direct link establishment request),
UE-2接收到消息(1)后启动安全模式,通过SRB1向UE-1发送消息(2)直接安全模式命令(Direct security mode command)。
UE-1通过SRB1向UE-2回复消息(3)直接安全命令模式完成(Direct security mode complete)。
通过消息(2)和消息(3),UE-1和UE-2之间建立了安全机制。如果UE-2接受了UE-1的连接建立请求,那么UE-2可以通过SRB2向UE-1回复消息(4)直接连接建立接受(Direct link establishment accept)。如果UE-2不接受UE-1的建立请求,那么可以通过SRB2回复消息(5)直接连接建立拒绝(Direct link establishment reject)。
当UE-1接收到了UE-2回复的消息(4)时,那么UE-1和UE-2之间的PC5连接就成功建立,相应地,UE(UE-1以及UE-2)会指示UE的下层建立PC5 RRC连接建立,然后UE会建立相应的PDCP实体、RLC实体以及用于PC5 RRC消息传输的SRB3,然后认定PC5 RRC连接建立完成。
这里所述的消息(1)-(5)是基于PC5信令(PC5signalling)协议栈的消息,可以被称为PC5-S消息(PC5-S message)
PC5SRB的建立
UE建立SRB用于PC5-S消息的传输,不同的PC5-S消息在不同类型的SRB上传。
当UE需要传递PC5-S消息时,如果相应的SRB没有建立,那么在UE
的上层请求传输该PC5-S消息时或者请求用于传输PC5-S消息的sidelink SRB时,UE的RRC层会建立相应的PDCP实体、RLC实体、sidelink逻辑信道用于该PC5-S消息的传输。根据PC5-S消息的类型,RRC层建立不同的SRB。例如,
SRB0用于传输在PC5-S安全机制建立之前需要进行传输的PC5-S消息,例如消息(1);SRB1用于传输用于建立安全机制的PC5-S消息,例如消息(2)和消息(3);SRB2用于传输在PC5-S安全机制建立之后需要进行传输的PC5-S消息,例如消息(4)和消息(5)。
L2 U2U(UE to UE)remote UE and relay UE
基于侧行链路通信层二(L2)中继架构的remote UE、relay UE的控制面协议栈如图3所示。图中左侧的source UE(源UE)和右侧的destination UE(目的地UE)都是remote UE,中间为relay UE(中继UE)。
Remote UE中的source UE选定了一个relay UE为自己提供中继服务后,会和relay UE建立PC5连接(PC5link),以便通过relay UE和destination UE进行通信。类似的,destination UE也需要和relayUE建立PC5的连接。
然后通过relay UE,source UE和destination UE之间建立PC5的连接。
PC5接口
PC5接口是Remote UE和relay UE之间的无线通信接口。Remote UE和relay UE之间通过侧行链路(sidelink)通信,侧行链路的通信接口为PC5接口,因此在本文中sidelink与PC5的描述可以相互替换。
PC5 RLC实体是指用于PC5接口通信的RLC实体。在UE通过relay UE与基站进行连接时,PC5 RLC实体承载了来自Uu PDCP实体的信息,因此这样的PC5 RLC实体又可以称为PC5 RLC承载(bearer)。
PC5 SRAP实体指用于PC5接口通信的SRAP实体,在远端UE通过relay UE与对端UE进行连接时,远端UE侧的PC5 SRAP根据配置的承载到PC5 RLC的映射关系,确定将initiatingUE发送给destination UE的数据递交给哪一个或者哪一些的PC5 RLC信道。
相应的,在destination UE侧,PC5SRAP根据配置的PC5 RLC信道到承载的映射关系,确定将接收到的initiatingUE发送给destination UE的数据递交给哪一个或者哪一些承载。
在relay UE中也存在对应于remote UE侧的PC5 SRAP实体。
以下,详细描述本发明对于上述问题的若干实施例。
实施例1
该实施例给出了一种由用户设备UE执行的方法,是一个UE通过中继UE与另外一个UE进行sidelink通信的过程中执行的方法,其中,经由中继UE进行通信的两个UE称为远端UE。
实施例1提供了在remote UE侧实施的方法。
如图4所示,上述方法包括如下步骤:
步骤S401:远端UE的上层(upperlayers)请求传输PC5-S消息,或者请求用于传输PC5-S消息的sidelink SRB。这里的上层,通常是指RRC层以上。这里的PC5-S消息是基于PC5信令(PC5signalling)协议栈的消息。
其中,根据PC5-S消息的类型,RRC层建立不同的SRB。例如,
SRB0用于传输在PC5-S安全机制建立之前要传输的PC5-S消息;
SRB1用于传输用于建立安全机制的PC5-S消息;
SRB2用于传输在PC5-S安全机制建立之后要传输的PC5-S消息。
步骤S402:基于该请求,远端UE的RRC层会建立相应的PDCP实体、RLC实体、sidelink逻辑信道用于该PC5-S消息的传输。
步骤S403:远端UE进一步判断该SRB是否是用于L2 U2U remote UE,或者是用于relay场景下端到端(endtoend)的remoteUE之间的PC5-S消息,
如果是,那么远端UE应用(apply)SRAP配置,其中应用SRAP配置至少包括了建立SRAP实体,其中的SRAP配置可以是事先规定的(specified),还可以包括如下信息之一或者多:
-端到端的承载标识取值,优选的,包含了信令承载标识的取值,例如取值为0的信令承载,即SRB0或者是取值为1或2的信令承载,即SRB1或者SRB2;
-PC5接口处的RLC信道,例如信道标识,优选的,可以是PC5接口处的输出RLC信道(Egress RLC channel),该输出RLC信道是remote UE向relay UE发送数据包(data packet)的PC5 RLC信道;或者是PC5接口处的输入RLC信道(Ingress RLC channel),该输入RLC信道是remote UE用于接收来自relay UE的数据包的PC5 RLC信道;
-承载标识和RLC信道的映射列表,列表中的映射关系可以是:
SRB0映射到逻辑信道标识为X的PC5 RLC信道;
SRB1映射到逻辑信道标识为Y的PC5 RLC信道;
SRB2映射到逻辑信道标识为Z的PC5 RLC信道。
特别地,X、Y、Z的取值可以是三者相同的,又或者是各自取不同的值,又或者是其中两者相同,与另外一个不同,例如Y和Z的取值相同,X和Y/Z的取值不同等。
优选的,远端UE还可以进一步判断该SRB是哪一个SRB,例如,当SRB是SRB0时,执行上述操作,或者是当SRB是SRB1时执行上述操作,或者是当SRB是SRB2时执行上述操作。具体的实施方式可以是:
基于该请求,远端UE的RRC层会建立相应的PDCP实体、RLC实体、sidelink逻辑信道用于该PC5-S消息的传输。以及当该SRB是用于L2 U2U remote UE,或者是用于relay场景下端到端(endtoend)的remoteUE之间的PC5-S消息,且是SRB1时,应用SRAP配置。
实施例1可以用于L2 U2U两端的remote UE,包括initiating UE和destination UE。
在initiating UE侧,在UE应用了SRAP配置之后,来自SRAP层之上的数据包(data packet)会被送往SRAP实体,根据与该数据包关联的目的地信息,UE可以为该数据包添加SRAP包头(SRAP Header),形成SRAP PDU(packet data unit)。在SRAP包头中携带目的地信息、以及端到端的承载信息,然后根据SRAP配置中的映射关系,SRAP PDU被递交给SRAP层之下对应的PC5 RLC信道进行传输。
在destination UE侧,在UE应用了SRAP配置之后,接收到的SRAP PDU将被去除SRAP包头,并且根据包头中的承载信息送往对应的PDCP实体/端到端承载。
实施例2
实施例2提供了在relay UE侧实施的方法。
当relay UE和remote UE之间的PC5 RRC连接建立时,在relay UE侧应用SRAP配置。其中应用SRAP配置至少包括了建立SRAP实体,其中的SRAP配置可以是事先规定的(specified),还可以包括如下信息之一或者多:
-端到端的承载标识取值,优选的,包含了信令承载标识的取值,例如取值为0的信令承载,即SRB0或者是取值为1或2的信令承载,即SRB1或者SRB2;
-PC5接口处的输入RLC信道(Ingress RLC channel),例如信道标识,这里的输入RLC信道可以是relay UE用于接收来自remote UE的数据包的RLC信道;
-PC5接口处的输出RLC信道(Egress RLC channel),例如信道标识,这里的输出RLC信道可以是relay UE向remote UE发送数据包的RLC信道;
-输入RLC信道和输出RLC信道的映射关系,例如承载标识为0且来自输入RLC信道标识为M的数据包将被传递到信道标识取值为N的输出RLC信道。
实施例3
作为实施例1的补充,当UE的上层(upperlayers)中止传输PC5-S消息时,UE将释放相应的PDCP实体、RLC实体以及逻辑信道,如果SRAP已经建立了,那么还需要释放相应的SRAP实体。
图5是本发明涉及的用户设备UE的简要结构框图。如图5所示,该用户设备UE500包括处理器501和存储器502。处理器501例如可以包括微处理器、微控制器、嵌入式处理器等。存储器502例如可以包括易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器等。存储器502上存储有程序指令。该指令在由处理器501运行时,可以执行本发明详细描述的由用户设备执行的上述
方法。
运行在根据本发明的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本发明的实施例功能的程序。该程序或由该程序处理的信息可以临时存储在易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器***中。
用于实现本发明各实施例功能的程序可以记录在计算机可读记录介质上。可以通过使计算机***读取记录在所述记录介质上的程序并执行这些程序来实现相应的功能。此处的所谓“计算机***”可以是嵌入在该设备中的计算机***,可以包括操作***或硬件(如***设备)。“计算机可读记录介质”可以是半导体记录介质、光学记录介质、磁性记录介质、短时动态存储程序的记录介质、或计算机可读的任何其他记录介质。
用在上述实施例中的设备的各种特征或功能模块可以通过电路(例如,单片或多片集成电路)来实现或执行。设计用于执行本说明书所描述的功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、或其他可编程逻辑器件、分立的门或晶体管逻辑、分立的硬件组件、或上述器件的任意组合。通用处理器可以是微处理器,也可以是任何现有的处理器、控制器、微控制器、或状态机。上述电路可以是数字电路,也可以是模拟电路。因半导体技术的进步而出现了替代现有集成电路的新的集成电路技术的情况下,本发明的一个或多个实施例也可以使用这些新的集成电路技术来实现。
此外,本发明并不局限于上述实施例。尽管已经描述了所述实施例的各种示例,但本发明并不局限于此。安装在室内或室外的固定或非移动电子设备可以用作终端设备或通信设备,如AV设备、厨房设备、清洁设备、空调、办公设备、自动贩售机、以及其他家用电器等。
如上,已经参考附图对本发明的实施例进行了详细描述。但是,具体的结构并不局限于上述实施例,本发明也包括不偏离本发明主旨的任何设计改动。另外,可以在权利要求的范围内对本发明进行多种改动,通过适当地组合不同实施例所公开的技术手段所得到的实施例也包含在本发明的技术范围内。此外,上述实施例中所描述的具有相同效果的组件可以相互
替代。
Claims (9)
- 一种由用户设备执行的方法,是一个用户设备UE通过中继UE与另外一个UE进行侧行链路通信的过程中执行的方法,其中,经由中继UE进行通信的两个UE为远端UE,上述方法包括如下步骤:远端UE的上层请求传输PC5-S消息或者请求用于传输PC5-S消息的侧行链路通信SRB,该上层为RRC层以上,该PC5-S消息是基于PC5信令协议栈的消息;基于该请求,远端UE的RRC层建立相应的PDCP实体、RLC实体、侧行链路通信逻辑信道用于该PC5-S消息的传输;以及远端UE判断该SRB是否是用于侧行链路通信层二中继架构的远端UE,或者是用于中继场景下端到端的远端UE之间的PC5-S消息,如果判断为该SRB是用于侧行链路通信层二中继架构的远端UE,或者是用于中继场景下端到端的远端UE之间的PC5-S消息,那么远端UE应用SRAP配置,其中,应用SRAP配置至少包括建立SRAP实体。
- 根据权利要求1所述的由用户设备执行的方法,其中,根据PC5-S消息的类型,RRC层建立不同的SRB,SRB0用于传输在PC5-S安全机制建立之前要传输的PC5-S消息;SRB1用于传输用于建立安全机制的PC5-S消息;SRB2用于传输在PC5-S安全机制建立之后要传输的PC5-S消息。
- 根据权利要求2所述的由用户设备执行的方法,其中,SRAP配置是事先规定的。
- 根据权利要求2所述的由用户设备执行的方法,其中,SRAP配置包括下述信息中的至少一者:端到端的承载标识取值;PC5接口处的RLC信道;承载标识和RLC信道的映射列表。
- 根据权利要求4所述的由用户设备执行的方法,其中,列表中的映射关系是:SRB0映射到逻辑信道标识为X的PC5 RLC信道;SRB1映射到逻辑信道标识为Y的PC5 RLC信道;SRB2映射到逻辑信道标识为Z的PC5 RLC信道。
- 根据权利要求5所述的由用户设备执行的方法,其中,X、Y、Z的取值是三者相同、或者是三者不同、或者是其中两者相同。
- 根据权利要求2所述的由用户设备执行的方法,其中,还包括如下步骤:远端UE进一步判断该SRB是SRB0、SRB1、SRB2中的哪一个SRB。
- 根据权利要求1-7中任一项所述的由用户设备执行的方法,其中,当远端UE的上层中止传输PC5-S消息时,远端UE释放相应的PDCP实体、RLC实体以及逻辑信道,如果SRAP已经建立了,那么远端UE还释放相应的SRAP实体。
- 一种用户设备,包括:处理器;以及存储器,上述存储器上存储有指令,上述指令在由上述处理器运行时,使上述用户设备执行根据权利要求1-8中任一项所述的方法。
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