WO2022127582A1 - 一种通信方法、装置及系统 - Google Patents
一种通信方法、装置及系统 Download PDFInfo
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- WO2022127582A1 WO2022127582A1 PCT/CN2021/134412 CN2021134412W WO2022127582A1 WO 2022127582 A1 WO2022127582 A1 WO 2022127582A1 CN 2021134412 W CN2021134412 W CN 2021134412W WO 2022127582 A1 WO2022127582 A1 WO 2022127582A1
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- terminal device
- relay
- remote
- rrc
- establishment
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- 238000000034 method Methods 0.000 title claims abstract description 322
- 238000004891 communication Methods 0.000 title claims abstract description 108
- 230000000977 initiatory effect Effects 0.000 claims abstract description 61
- 230000008569 process Effects 0.000 claims description 98
- 238000012545 processing Methods 0.000 claims description 27
- 238000004590 computer program Methods 0.000 claims description 4
- 108091005487 SCARB1 Proteins 0.000 description 104
- 102100037118 Scavenger receptor class B member 1 Human genes 0.000 description 104
- 238000005516 engineering process Methods 0.000 description 42
- 230000006870 function Effects 0.000 description 38
- 230000015654 memory Effects 0.000 description 17
- 230000011664 signaling Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 11
- 230000004044 response Effects 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 9
- 230000006978 adaptation Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000010267 cellular communication Effects 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/80—Ingress point selection by the source endpoint, e.g. selection of ISP or POP
- H04L45/85—Selection among different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
- H04B17/328—Reference signal received power [RSRP]; Reference signal received quality [RSRQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/34—Modification of an existing route
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/18—Interfaces between hierarchically similar devices between terminal devices
Definitions
- the present application relates to the field of communication technologies, and in particular, to a communication method, device, and system.
- the terminal device can communicate with the network device through another terminal device, that is, another terminal device can provide a relay service for the terminal device, so that the terminal device can communicate with the network device.
- a terminal device that communicates with a network device through another terminal device may be referred to as a remote terminal device, and a terminal device that provides a relay service for the remote terminal device may be referred to as a relay terminal device.
- the remote terminal equipment During the communication between the remote terminal equipment and the network equipment through the relay terminal equipment, if the remote terminal equipment detects that the sidelink (SL) between the remote terminal equipment and the relay terminal equipment fails, the radio link fails (radio link). failure, RLF), the service of the remote terminal equipment may be interrupted. There is currently no solution to this.
- Embodiments of the present application provide a communication method, apparatus, and system, which are used to improve service continuity of a remote terminal device.
- a first communication method is provided.
- the method can be applied to a first communication system, which includes, for example, a first terminal device and a second terminal device.
- the method includes: when the first terminal device determines that the second terminal device cannot continue to provide relay services for the first terminal device, the first terminal device initiates RRC re-establishment in a first manner, and the first manner is through
- the manner in which the Uu interface initiates RRC re-establishment is either the manner in which RRC re-establishment is initiated by a new terminal device, or the manner in which RRC re-establishment is initiated by the second terminal device.
- the method further includes: the first terminal device receives, through the second terminal device, the first information from the first network device, where the first information is used to indicate that RRC re-establishment is initiated through Uu , or instruct to initiate RRC re-establishment through a new terminal device, or instruct to initiate RRC re-establishment through the second terminal device; or, the first information includes the RSRP and/or the RSRP of the cell selected by the first terminal device. the RSRP of the third terminal device selected by the first terminal device.
- the first terminal device may initiate RRC re-establishment to restore the service of the first terminal device as soon as possible.
- the first terminal device can choose the way of initiating RRC re-establishment, for example, it can initiate RRC re-establishment through the Uu interface, or it can initiate RRC re-establishment through a new terminal device, or it can continue to initiate RRC re-establishment through the second terminal device, etc., The manner in which the first terminal device initiates RRC re-establishment is more flexible.
- the first terminal device can select a better way to initiate RRC re-establishment according to factors such as network quality, which improves the success rate of RRC re-establishment, improves the service continuity of the first terminal device, and reduces the risk of service discontinuity. resulting in packet loss.
- the first mode may be indicated by the network device.
- the first network device sends the first information to the first terminal device through the second terminal device.
- the first terminal device receives the first information from the first network device through the second terminal device.
- the first terminal device may determine the first manner according to the indication of the first information, thereby initiating RRC re-establishment. Instructed by the network, it is not necessary for the first terminal device to determine the method of initiating RRC re-establishment by itself, which can simplify the execution process of the terminal device, so that the method in this embodiment of the present application can be applied to more terminal devices (for example, even if the capability is limited.
- the terminal equipment of the present application can also apply the solutions of the embodiments of the present application).
- the first mode can also be determined by the first terminal device itself, without requiring an instruction from the network device, which can save signaling overhead.
- the first information includes the RSRP of the cell selected by the first terminal device and/or the first terminal device selected by the first terminal device.
- the third One way is to initiate RRC re-establishment through the Uu interface, and the first cell is the cell selected by the first terminal device; or, when the RSRP of the first cell is greater than the first RSRP threshold, the first cell
- the method is the method of initiating RRC re-establishment through the Uu interface, the first cell is the cell selected by the first terminal equipment; or, the RSRP of the cell selected by the first terminal equipment is less than or equal to the first RSRP threshold, And when the first terminal device selects a third terminal device that can provide relay services, the first method is a
- the third terminal device is a new terminal device that can provide a relay service selected by the first terminal device, or the third terminal device and the second terminal device are the same terminal device.
- the first mode can also be determined by the first terminal device itself, for example, the first terminal device can determine the first mode according to the RSRP of the cell selected by the first terminal device and/or the RSRP of the third terminal device selected by the first terminal device, so that The first terminal device may perform RRC re-establishment in a better manner according to RSRP, so as to improve the success rate of RRC re-establishment.
- the first terminal device determines that the second terminal device cannot continue to be the The first terminal device provides a relay service, including: the first terminal device detects the SL RLF between the first terminal device and the second terminal device; or, the first protocol layer of the first terminal device requests to release the The connection between the first terminal device and the second terminal device.
- the first terminal device may determine that the second terminal device cannot continue to provide the relay service for the first terminal device according to various situations, thereby reducing the delay for the first terminal device to initiate RRC re-establishment.
- the method further includes: the first terminal device starts a first timer; wherein the first timer is used when the first terminal device Stop when a cell is selected, or stop when the first terminal device selects a new terminal device capable of providing relay services; or, the first timer is used when the first terminal device selects a cell stop when the first terminal device is connected to a new terminal device capable of providing relay services; or, the first timer is used when the first terminal device selects a cell stop, or stop when the first terminal device obtains the identification of the serving cell of the new terminal device that can provide relay services selected by the first terminal device; the first terminal device selects the first cell, stop the first timer.
- the terminal device When the terminal device initiates RRC re-establishment through the Uu interface, it can start the first timer. If the first terminal device selects a suitable cell (for example, the first cell) before the first timer expires, the first terminal device The first timer may be stopped, and if the first terminal device has not selected a suitable cell when the first timer expires, the first terminal device may stop cell selection, for example, the first terminal device may enter the RRC idle state, or the first terminal device may A terminal device may instead initiate RRC re-establishment, etc. through the terminal device.
- the cell selection time of the first terminal equipment can be effectively controlled by the first timer, and the success rate of RRC re-establishment can be improved.
- the first terminal device starts the first timer, including: the first terminal device is in In the case of initiating RRC re-establishment in the first manner, the first timer is started; or, the first terminal device determines that the second terminal device cannot continue to provide relay services for the first terminal device In the case of , start the first timer; or, the first terminal device starts the first timer after initiating RRC re-establishment in the first manner and before performing cell selection.
- the first terminal device may start the first timer in different situations, which is not limited in this embodiment of the present application.
- the method further includes: the first terminal device does not select an RRC re-establishment method.
- the cell, or, the cell selected by the first terminal device is no longer suitable, or, the first terminal device has not received the RRC re-establishment message from the second network device, or, the first terminal device selected
- the RSRP of the cell is less than or equal to the second RSRP threshold
- the second network device is the network device that the first terminal device initiates the RRC re-establishment
- the first terminal device selects a new one that can provide relay services
- the third terminal device when the first terminal device selects a third terminal device, the first terminal device initiates RRC re-establishment through the third terminal device, and the third terminal device can be the first terminal device Terminal equipment provides relay services.
- the first terminal device may not be able to continue to initiate RRC re-establishment through the Uu interface. In this case, the first terminal device may reselect a terminal device to initiate RRC re-establishment through the terminal device, thereby improving the success rate of RRC re-establishment of the terminal device.
- the third terminal device and the second terminal device may be the same terminal device, or may also be different terminal devices.
- the first terminal device does not select a cell, including: when the first timer times out, The first terminal device does not select a cell, and the first timer is started when the first terminal device initiates RRC re-establishment in the first manner, or the first timer is The first terminal device is started when it determines that the second terminal device cannot continue to provide relay services for the first terminal device, or the first timer is started when the first terminal device It is started after RRC re-establishment is initiated in the first manner and before cell selection is performed.
- the first terminal device fails to select a suitable cell, which may mean that the first terminal device fails to select a suitable cell when the first timer times out.
- the first timer can effectively control the cell selection time of the first terminal device to avoid The terminal device performs cell selection indefinitely.
- the first terminal device does not receive an RRC re-establishment message from the second network device, including : When the second timer expires, the first terminal device does not receive an RRC re-establishment message from the second network device, and the second timer is started after the first terminal device selects a cell of. If the first terminal device selects a suitable cell, it can start the second timer, and if the first terminal device receives an RRC re-establishment message from the network before the second timer expires, the first terminal device can stop the second timer.
- the first terminal device has not received the RRC re-establishment message from the network when the second timer expires, then the first terminal device has not received the RRC re-establishment message from the network, for example, the first terminal device has not received the RRC re-establishment message from the network. Instead, the RRC re-establishment may be initiated by the terminal device, or the first terminal device may enter an RRC idle state, or the like.
- the second timer can effectively control the time when the terminal device receives the RRC re-establishment message from the network, so as to avoid the terminal device from waiting for the message from the network indefinitely.
- the method further includes: in the case that the first terminal device initiates RRC re-establishment through the first method, or, the first terminal device initiates RRC re-establishment through the first method.
- the first terminal device determines that the second terminal device cannot continue to provide relay services for the first terminal device, or, before the first terminal device reselects a terminal device that can provide relay services, the first terminal device A terminal device starts a second timer; when the first terminal device selects a third terminal device, or when the connection between the first terminal device and the third terminal device is completed, or when the first terminal device When the identity of the serving cell of the third terminal device is obtained, the first terminal device stops the second timer.
- the terminal equipment initiates RRC re-establishment through the terminal equipment (new terminal equipment or second terminal equipment), the second timer can be started.
- the first terminal device may stop the second timer, and if the first terminal device has not selected a suitable terminal device when the second timer expires, the first terminal device may stop selecting a terminal A device, such as the first terminal device, may enter the RRC idle state, or the first terminal device may instead initiate RRC re-establishment through the Uu interface, or the like.
- the selection time of the terminal equipment of the first terminal equipment can be effectively controlled by the second timer, and the success rate of RRC re-establishment can be improved.
- the first terminal device initiates RRC re-establishment in the first manner, including: the The first terminal device establishes the SL RLC bearer of the first SRB; the first terminal device sends an RRC re-establishment request message to the second network device through the third terminal device, and the second network device is the third A network device accessed by a terminal device; the first terminal device receives an RRC re-establishment message from the second network device through the third terminal device, and the RRC re-establishment message is transmitted on the first SRB. If the first terminal device initiates RRC re-establishment through the third terminal device, the first terminal device may communicate with the second network device through the third terminal device.
- the method further includes: the first terminal device starts a first timer; wherein the first timer is used when the first Stop when the terminal equipment selects a cell, or stop when the first terminal equipment selects a new terminal equipment capable of providing relay services; or, the first timer is used for when the first terminal equipment selects a new terminal equipment capable of providing relay services.
- the first timer is used when the first terminal device selects the when the first terminal device obtains the identification of the serving cell of the new terminal device that can provide relay services selected by the first terminal device; the first terminal device reselects A terminal device capable of providing relay services, in the case of selecting the third terminal device, the first terminal device stops the first timer; or, the first terminal device reselects the terminal device capable of providing relay services.
- the service terminal device when the third terminal device is selected and a connection is established with the third terminal device, the first terminal device stops the first timer; or, the first terminal device stops the first timer.
- the terminal device reselects a terminal device that can provide a relay service, and in the case where the third terminal device is selected and the identity of the serving cell of the third terminal device is obtained, the first terminal device stops the first timer. In this way, both the cell selection process and the terminal device selection process can be performed by the terminal device. To a suitable terminal device, it is considered that the terminal device selection process is successful) to initiate RRC re-establishment, thereby further reducing the delay of RRC re-establishment.
- the first terminal device starts a first timer, including: the first terminal device In the case of initiating RRC re-establishment in the first manner, the first timer is started; or, the first terminal device determines that the second terminal device cannot continue to provide a relay for the first terminal device In the case of service, start the first timer; or, after the first terminal device initiates RRC re-establishment in the first manner, and before reselecting a terminal device capable of providing relay services, starts all Describe the first timer.
- the RRC is initiated through a new terminal device
- the method further includes: the first terminal device sends data of a second SRB to a third terminal device, where the second SRB is the connection between the first terminal device and the second network SRB between devices, the second network device is a network device accessed by the third terminal device, and the third terminal device is a new terminal device selected by the first terminal device; the third terminal device The device receives the data of the second SRB from the first terminal device; the third terminal device establishes or re-establishes the RLC bearer of the first SRB corresponding to the first terminal device, the RLC of the first SRB
- the bearer includes a first RLC bearer between the first terminal device
- the third terminal device may establish or re-establish the RLC bearer corresponding to the first SRB of the first terminal device, so that the first terminal device and the third terminal device can communicate with the first terminal device through the RLC bearer.
- Information is forwarded between two network devices.
- the first SRB is, for example, SRB1, or other SRBs.
- the second SRB is, for example, SRB0, or other SRBs.
- the third terminal device may also belong to the first communication system.
- the third terminal device establishes or reconstructs all The RLC bearer of the first SRB includes: the third terminal device receives data of the second SRB from the first terminal device, and the third terminal device establishes or rebuilds the RLC bearer of the first SRB ; or, the third terminal device receives the first indication information from the second network device, and the third terminal device establishes or re-establishes the RLC bearer of the first SRB, wherein the first indication information uses to instruct the establishment of the RLC bearer of the first SRB, or instruct to receive the data of the first SRB sent by the second network device to the first terminal device, or instruct to receive the data sent by the second network device to the the RRC re-establishment message of the first terminal device, or instructing the first terminal device to send an RRC re-establishment request message through the third terminal device; or, the third terminal device receives an RRC
- the third terminal device may establish or re-establish the RLC bearer corresponding to the first SRB of the first terminal device according to different trigger conditions.
- one triggering method is that the third terminal device receives the data of the second SRB from the first terminal device, then neither the first terminal device nor other devices need to trigger the third terminal device specially, and the first terminal device only needs to send data to the third terminal device
- the terminal device sends the data of the second SRB the third terminal device knows that the RLC bearer corresponding to the first SRB of the first terminal device needs to be established or rebuilt, thereby reducing signaling overhead.
- the second network device or the first terminal device may also instruct the third terminal device through the indication information, so that the third terminal device can make it clearer when the first SRB corresponding to the first terminal device should be established or re-established RLC bearer.
- the third terminal device may also belong to the first communication system.
- the method further includes: the second terminal device detects an RLF with the first network device; the first The second terminal device initiates RRC re-establishment. For example, if the second terminal device cannot continue to provide relay services for the first terminal device, it may be that the first terminal device discovers first, or the second terminal device discovers first. If the RLF is between, the second terminal device may also determine that it cannot continue to provide the relay service for the first terminal device, which makes the solution of the embodiment of the present application more flexible.
- the method further includes: the second terminal device sends a message to the first terminal device Send third indication information, where the third indication information is used to instruct to perform RRC re-establishment, or to instruct the second terminal device to generate RLF. If the second terminal device determines that it cannot continue to provide the relay service for the first terminal device, the second terminal device can notify the first terminal device in time, so that the first terminal device can take corresponding measures as soon as possible, thereby reducing the number of first terminal devices. Probability of service interruption for terminal equipment.
- the first terminal device determines that the second terminal device cannot continue to be the first terminal device.
- Providing a relay service by a terminal device includes: determining, by the first terminal device, that the second terminal device cannot continue to provide the relay service for the first terminal device according to the third indication information. If the second terminal device finds out that the relay service cannot be provided for the first terminal device first, the second terminal device can notify the first terminal device through the third indication information, and the first terminal device can determine the first terminal device according to the third indication information. The second terminal device cannot continue to provide relay services for the first terminal device.
- the method further includes: the first terminal device receiving the third indication information Then, start a fifth timer; when the fifth timer expires, if the first terminal device has not received the identification of the second cell from the second terminal device, the first terminal device enters the RRC Idle state; or, before the fifth timer expires, if the first terminal device receives the identifier of the second cell from the second terminal device, the first terminal device closes the fifth timer wherein, the second cell is a cell selected by the second terminal device. If RLF occurs between the second terminal device and the network, the second terminal device will initiate RRC re-establishment.
- the second terminal equipment may successfully perform RRC re-establishment, or may fail to perform RRC re-establishment.
- the first terminal device can start the fifth timer after receiving the third indication information, if the first terminal device has not received the identification of the second cell from the second terminal device when the fifth timer expires , the RRC re-establishment process of the second terminal equipment may fail, the first terminal equipment may enter the RRC idle state by itself, or the first terminal equipment may re-select a terminal equipment to initiate RRC re-establishment, or the first terminal equipment may pass Uu The interface initiates RRC re-establishment, etc.
- the first terminal device can take corresponding measures in time, thereby reducing the probability of service interruption of the first terminal device. And through the fifth timer, the second terminal device does not need to inform the first terminal device of whether the RRC re-establishment is successful, which reduces signaling overhead.
- the method further includes: after the RRC re-establishment is completed, the second terminal device sends the identity of the second cell to the first terminal device; or, the second terminal device selects the first When there are two cells, the identifier of the second cell is sent to the first terminal device; wherein, the second cell is a cell selected by the second terminal device by initiating RRC re-establishment.
- the second terminal device may send the identifier of the second cell to the first terminal device for the first terminal device to calculate the need to carry shortMAC-I in the RRC re-establishment request message.
- the method further includes: The second terminal equipment does not select a cell, and the second terminal equipment sends fourth indication information to the first terminal equipment, where the fourth indication information is used to indicate that the RRC re-establishment fails, or to indicate that the release and the The connection between the first terminal devices; after receiving the fourth indication information, the first terminal device enters the RRC idle state, or selects a new terminal device to initiate RRC re-establishment, or initiates RRC re-establishment through the Uu interface.
- the second terminal device may send fourth indication information to the second terminal device to indicate that the RRC re-establishment fails, so that the first terminal device can take corresponding measures in time to reduce the The probability of service interruption of the first terminal device.
- the method further includes : the first terminal device sends fifth indication information to the second terminal device, where the fifth indication information is used to indicate that RRC re-establishment is not performed through the second terminal device, or to indicate that the connections between end devices. If the first terminal device receives the third indication information, it may send fifth indication information to the second terminal device to respond to the third indication information.
- the method further includes: the second terminal device re-establishes the RRC Relay service is not provided until an appropriate cell is selected during the process, or until the RRC re-establishment is completed. If a terminal device establishes a connection with a second terminal device that is in the process of RLF or RRC re-establishment, it may cause that the terminal device cannot immediately transmit data through the second terminal device or cannot connect to the network device through the second terminal device. The service of the terminal device brings a large delay.
- the technical solutions of the embodiments of the present application can solve this problem, so that other terminal devices can select a more suitable terminal device as soon as possible to provide a relay service, thereby reducing the service interruption time of the terminal device.
- the second terminal device does not provide a relay service, including: the first The second terminal device does not send the discovery message related to the relay service, or refuses to establish a connection with the terminal device that requests to provide the relay service.
- a discovery message may be sent, and the discovery message may include information related to relay services, for example, it may indicate that the terminal device sending the discovery message can provide relay services, etc.
- the second terminal device does not send a discovery message related to the relay service before selecting an appropriate cell or before the RRC re-establishment process is completed.
- the second terminal device does not provide a relay service, including: the first The second terminal equipment sends sixth indication information to the first terminal equipment, where the sixth indication information is used to indicate that the second terminal equipment is in the RLF state, or to indicate that the second terminal equipment is in the process of RRC re-establishment, or Indicates that the connection between the second terminal device and the first network device is unavailable.
- the second terminal device may actively send the sixth indication information, so that the first terminal device can learn in time that the second terminal device cannot access the network temporarily.
- the sixth indication information is included in the first message, and the first The message is a discovery message, or a message for establishing a connection between terminal devices.
- the sixth indication information may also be included in other messages.
- the second terminal device does not provide a relay service, including: the first The second terminal device sends seventh indication information to the first terminal device, where the seventh indication information is used to instruct not to send a connection establishment request message, or to instruct not to perform a PC5 connection establishment process.
- the second terminal device may actively send the seventh indication information, so that the first terminal device can learn in time that a connection with the second terminal device cannot be established temporarily.
- the seventh indication information is included in the second message, and the second The message is a discovery message, or a message for establishing a connection between terminal devices.
- the seventh indication information may also be included in other messages.
- the second terminal device does not provide a relay service, including: the first The second terminal device does not respond to the message from the first terminal device for establishing a connection with the second terminal device. If the second terminal device does not respond to the message for establishing the connection, other terminal devices cannot establish a connection with the second terminal device. In this manner, the second terminal device does not need to send the indication information, which can save signaling overhead.
- the method further includes: when the second terminal device selects a new After the cell is established, or after the RRC re-establishment is completed, a message for establishing a connection with the second terminal device from the first terminal device is responded. If the terminal equipment does not respond to the connection establishment message from other terminal equipment before selecting a suitable cell during the RRC re-establishment process, after the RRC re-establishment is completed, or after selecting a new cell, it can respond These messages are used to establish connections with other terminal devices, and other terminal devices do not need to send messages again, so as to save signaling overhead.
- a second communication method which can be performed by a terminal device, or by a chip system capable of implementing the functions of the terminal device, or performed by a larger device including the terminal device.
- the method includes: the second terminal device receives the shortMAC-I from the first terminal device; the second terminal device rebuilds the RLC bearer of the first SRB corresponding to the first terminal device, the RLC bearer of the first SRB including the RLC bearer between the first terminal device and the second terminal device and the second RLC bearer between the first terminal device and the second network device, the second network device being the A network device accessed by a second terminal device; the second terminal device sends an RRC re-establishment request message to the second network device, where the RRC re-establishment request message includes the shortMAC-I; the second terminal device The RRC re-establishment message from the second network device is received through the second RLC bearer; the second terminal device sends the RRC re-establishment message to the first terminal
- the second terminal device establishes or re-establishes an RLC bearer corresponding to the first SRB of the first terminal device, including: the second terminal device receives data from the second SRB of the first terminal device, and the second terminal device establishes or re-establishes the RLC bearer of the first SRB; or, the second terminal device receives data from the second SRB
- the first indication information of the second network device, where the second terminal device establishes or re-establishes the RLC bearer of the first SRB wherein the first indication information is used to instruct the establishment of the RLC bearer of the first SRB , or instruct to receive the data of the first SRB sent by the second network device to the first terminal device, or instruct to receive the RRC re-establishment message sent by the second network device to the first terminal device, Or instruct the first terminal device to send an RRC re-establishment request message through the second terminal
- the data of the first SRB or instructing to receive the RRC re-establishment message sent by the second network device to the first terminal device, or instructing the first terminal device to send an RRC re-establishment message through the second terminal device.
- a third communication method is provided, which can be performed by a terminal device, or by a chip system capable of implementing the functions of the terminal device, or by a larger device including the terminal device.
- the method includes: a first terminal device communicates with a first network device through a second terminal device, the second terminal device provides a relay service for the first terminal device; the first terminal device determines the second terminal device The device cannot continue to provide relay services for the first terminal device; the first terminal device enters the RRC idle state; wherein the first terminal device determines that the second terminal device cannot continue to be the first terminal device
- Providing a relay service including one or more of the following: the first terminal device detects the SLRLF between the first terminal device and the second terminal device; or, the first protocol layer of the first terminal device requests to release the the connection between the first terminal device and the second terminal device; or, the connection between the first terminal device and the second terminal device is released.
- the first terminal device may release the connection with the second terminal device and return to the RRC idle state, which is relatively simple to implement. And can save power consumption. After the first terminal device returns to the RRC idle state, it may re-establish an RRC connection with the network device, or may reselect the terminal device to continue the service of the first terminal device.
- a fourth communication method is provided, which can be performed by a terminal device, or by a system-on-chip, which can implement the functions of the terminal device, or be performed by a larger device including the terminal device.
- the method includes: a second terminal device detects an RLF with a first network device; the second terminal device initiates RRC re-establishment; the second terminal device selects a suitable cell during the RRC re-establishment process Before, or until the RRC re-establishment is completed, the relay service is not provided.
- the second terminal device does not provide a relay service, including: the second terminal device does not send a discovery message related to the relay service , or refuse to establish a connection with a terminal device that requests relay services.
- the second terminal device does not provide a relay service
- the second terminal device does not provide a relay service
- the second terminal device does not provide a relay service
- the terminal device sends sixth indication information to the first terminal device, where the sixth indication information is used to indicate that the second terminal device is in the RLF state, or to indicate that the second terminal device is in the process of RRC re-establishment, or to indicate The connection between the second terminal device and the first network device is unavailable.
- the sixth indication information is included in a first message, and the first message is a discovery message , or a message used to establish a connection between terminal devices.
- the second terminal device does not provide a relay service, including: the second terminal device sends a seventh Indication information, the seventh indication information is used to instruct not to send a connection establishment request message, or to instruct not to perform a PC5 connection establishment process.
- the seventh indication information is included in a second message, and the second message is a discovery message , or a message used to establish a connection between terminal devices.
- the second terminal device does not provide a relay service, including: the second terminal device does not respond to a message from the first terminal device A message for establishing a connection with the second terminal device.
- the method further includes: after the second terminal device selects a new cell, or After the RRC re-establishment is completed, a message for establishing a connection with the second terminal device from the first terminal device is responded.
- a communication system is provided, for example, referred to as a first communication system.
- the first communication system may include the first terminal device described in the first aspect above, or an electronic device (eg, a chip system) configured in the first terminal device, or a larger device including the first terminal device; And, the first communication system further includes the second terminal device described in the first aspect, or includes an electronic device (for example, a chip system) configured in the second terminal device, or includes a larger device including the second terminal device equipment.
- the first communication system may further include the third terminal device described in the first aspect, or include an electronic device (for example, a chip system) configured in the third terminal device, or include a third terminal device of larger equipment.
- the first terminal device and/or the second terminal device comprise corresponding means or modules for performing the above method.
- the first terminal device is configured to initiate RRC re-establishment through a first manner when it is determined that the second terminal equipment cannot continue to provide relay services for the first terminal equipment, and the first manner is based on Determined by the first information, the first method is the method of initiating RRC re-establishment through the Uu interface, or the method of initiating RRC re-establishment through a new terminal device, or the method of initiating RRC re-establishment through the second terminal device. way; of which,
- the first terminal device is further configured to receive, through the second terminal device, the first information from the first network device, where the first information is used to indicate that RRC re-establishment is initiated through Uu, or to indicate that RRC re-establishment is initiated through the Uu.
- the new terminal equipment initiates RRC re-establishment, or instructs the second terminal equipment to initiate RRC re-establishment; or,
- the first information includes the RSRP of the cell selected by the first terminal device and/or the RSRP of the third terminal device selected by the first terminal device.
- a communication device may be the second terminal device described in the second aspect above, or an electronic device (eg, a chip system) configured in the second terminal device, or a larger device including the second terminal device equipment.
- the communication device comprises corresponding means or modules for carrying out the above method.
- the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiving unit (sometimes also referred to as a transceiving module).
- the transceiver unit is configured to receive shortMAC-I from the first terminal device
- the processing unit configured to reconstruct the RLC bearer of the first SRB corresponding to the first terminal device, where the RLC bearer of the first SRB includes the RLC between the first terminal device and the second terminal device bearer and a second RLC bearer between the first terminal device and the second network device, where the second network device is a network device accessed by the second terminal device;
- the transceiver unit is further configured to send an RRC re-establishment request message to the second network device, where the RRC re-establishment request message includes the shortMAC-I;
- the transceiver unit is further configured to receive an RRC re-establishment message from the second network device through the second RLC bearer;
- the transceiver unit is further configured to send the RRC re-establishment message to the first terminal device through the first RLC bearer.
- the communication apparatus includes: a processor, coupled to the memory, for executing instructions in the memory, so as to implement the method executed by the second terminal device in the second aspect.
- the communication device further includes other components, such as an antenna, an input and output module, an interface, and the like. These components may be hardware, software, or a combination of software and hardware.
- a communication device may be the first terminal device described in the third aspect above, or an electronic device (eg, a chip system) configured in the first terminal device, or a larger device including the first terminal device equipment.
- the communication device comprises corresponding means or modules for carrying out the above method.
- the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiving unit (sometimes also referred to as a transceiving module).
- the transceiver unit is configured to communicate with a first network device through a second terminal device, and the second terminal device provides a relay service for the first terminal device;
- the processing unit configured to determine that the second terminal device cannot continue to provide relay services for the first terminal device
- the processing unit is configured to make the first terminal device enter the RRC idle state; wherein, the processing unit is configured to determine that the second terminal device cannot continue to be the first terminal through one or more of the following The device provides relay services:
- the first protocol layer of the first terminal device requests to release the connection between the first terminal device and the second terminal device; or,
- connection with the second terminal device is released.
- the communication apparatus includes: a processor, coupled with the memory, for executing instructions in the memory, so as to implement the method executed by the first terminal device in the third aspect.
- the communication device further includes other components, such as an antenna, an input and output module, an interface, and the like. These components may be hardware, software, or a combination of software and hardware.
- a communication device may be the second terminal device described in the fourth aspect above, or an electronic device (eg, a chip system) configured in the first terminal device, or a larger device including the first terminal device equipment.
- the communication device comprises corresponding means or modules for carrying out the above method.
- the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiving unit (sometimes also referred to as a transceiving module).
- the processing unit is configured to detect the RLF with the first network device
- the processing unit is further configured to initiate RRC re-establishment (or, the processing unit is further configured to pass the transceiver unit);
- the processing unit is further configured to not provide a relay service before an appropriate cell is selected in the RRC re-establishment process, or before the RRC re-establishment is completed.
- the communication apparatus includes: a processor, coupled to the memory, for executing instructions in the memory, so as to implement the method executed by the second terminal device in the fourth aspect.
- the communication device further includes other components, such as an antenna, an input and output module, an interface, and the like. These components may be hardware, software, or a combination of software and hardware.
- a computer-readable storage medium is provided, and the computer-readable storage medium is used to store a computer program or instruction, which, when executed, enables the method performed by the terminal device or the network device in the above aspects to be implemented .
- a computer program product comprising instructions which, when run on a computer, cause the methods of the above aspects to be implemented.
- the first terminal device may select a manner of initiating RRC re-establishment, so that the manner in which the first terminal device initiates RRC re-establishment is more flexible.
- the first terminal device can select a better way to initiate RRC re-establishment according to factors such as network quality, which improves the success rate of RRC re-establishment, improves the service continuity of the first terminal device, and reduces the risk of service discontinuity. resulting in packet loss.
- Figure 1 is a schematic diagram of a scenario in which a remote UE connects to a network through a relay UE;
- 2A and 2B are two schematic diagrams of the control plane protocol stack architecture of the layer 2 relay technology
- FIG. 3A and FIG. 3B are schematic diagrams of two application scenarios of an embodiment of the present application.
- FIG. 18 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application.
- FIG. 19 is a schematic block diagram of a terminal device provided by an embodiment of the present application.
- a terminal device is a device with a wireless transceiver function, which may be a fixed device, a mobile device, a handheld device (such as a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device (such as a built-in wireless device in the above-mentioned device). , communication modules, modems, or systems on a chip, etc.).
- the terminal device is used to connect people, things, machines, etc., and can be widely used in various scenarios, such as but not limited to the following scenarios: cellular communication, device-to-device communication (device-to-device, D2D), vehicle-to-everything (vehicle to everything, V2X), machine-to-machine/machine-type communications (M2M/MTC), Internet of things (internet of things, IoT), virtual reality (virtual reality, VR) , Augmented reality (AR), industrial control (industrial control), unmanned driving (self driving), telemedicine (remote medical), smart grid (smart grid), smart furniture, smart office, smart wear, smart transportation , terminal equipment for smart city, drone, robot and other scenarios.
- cellular communication device-to-device communication
- vehicle-to-everything vehicle to everything, V2X
- M2M/MTC machine-to-machine/machine-type communications
- IoT Internet of things
- virtual reality virtual reality
- AR Augmented reality
- the terminal equipment may sometimes be referred to as user equipment (UE), a terminal, an access station, a UE station, a remote station, a wireless communication device, a user equipment, or the like.
- UE user equipment
- the terminal device is described by taking the UE as an example.
- the terminal device when a terminal device is far away from the network device (for example, it is not within the coverage of the network device), or the terminal device is at the edge of the coverage of the network device, or the link quality between the terminal device and the network device is poor, or the terminal device If the terminal device cannot be directly served by the network device, or the terminal device does not have a Uu interface, or the terminal device has low power, or the terminal device is in the energy-saving mode, or the terminal device wants to save power consumption, the terminal device can pass the relay terminal device ( UE-to-Network Relay UE) communicates with network devices.
- the relay terminal device UE-to-Network Relay UE
- the relay terminal device may also be referred to as a relay user equipment (relay UE), and the relay terminal device may be a terminal device that provides network access for a remote terminal device.
- the remote terminal equipment may also be referred to as remote user equipment (remote UE).
- a remote UE refers to a UE that requires other UEs to provide relay services to access the network;
- a relay UE refers to a UE that provides relay services for other UEs.
- the relay UE For the relay UE to provide relay services for the remote UE, it can be understood that the information sent by the remote UE to the network device is forwarded to the network device through the relay UE, and the information sent by the network device to the remote UE is also forwarded to the remote UE through the relay UE. .
- the network devices in the embodiments of the present application include, for example, access network devices and/or core network devices.
- the access network device is a device with a wireless transceiver function, and is used to communicate with the terminal device.
- the access network equipment includes but is not limited to the base station (BTS, Node B, eNodeB/eNB, or gNodeB/gNB), the transmission reception point (TRP), the third generation partnership project (3rd Generation partnership project, 3GPP) subsequent evolution of base stations, access nodes in wireless fidelity (Wi-Fi) systems, wireless relay nodes, wireless backhaul nodes, etc.
- the base station may be: a macro base station, a micro base station, a pico base station, a small base station, a relay station, and the like. Multiple base stations may support the aforementioned networks of the same access technology, or may support the aforementioned networks of different access technologies.
- a base station may contain one or more co-sited or non-co-sited transmission reception points.
- the network device may also be a wireless controller, a centralized unit (centralized unit, CU), and/or a distributed unit (distributed unit, DU) in a cloud radio access network (cloud radio access network, CRAN) scenario.
- the network device can also be a server, a wearable device, or a vehicle-mounted device.
- a network device in a vehicle to everything (V2X) technology can be a road side unit (RSU).
- the following description will be given by taking the access network device as a base station as an example.
- the base station can communicate with the terminal equipment, and can also communicate with the terminal equipment through the relay station.
- a terminal device can communicate with multiple base stations in different access technologies.
- the core network equipment is used to implement functions such as mobility management, data processing, session management, policy and charging.
- the names of devices implementing core network functions in systems with different access technologies may be different, which are not limited in this embodiment of the present application.
- the core network equipment includes: access and mobility management function (AMF), session management function (session management function, SMF), policy control function (policy control function, PCF) or User plane function (user plane function, UPF), etc.
- AMF access and mobility management function
- SMF session management function
- policy control function policy control function
- PCF User plane function
- UPF User plane function
- the communication device for implementing the function of the network device may be a network device, or may be a device capable of supporting the network device to realize the function, such as a chip system, and the device may be installed in the network device.
- the technical solutions provided by the embodiments of the present application are described by taking the device for realizing the function of the network device being a network device as an example.
- D2D communication based on cellular network also known as proximity service (ProSe) in the 3rd generation partnership project (3GPP)
- ProSe proximity service
- 3GPP 3rd generation partnership project
- ProSe Direct Communication direct communication between two or more ProSe-enabled UEs in proximity without going through any network node.
- ProSe direct communication can be achieved through the sidelink communication access layer function.
- 5G ProSe Direct Communication direct communication between two or more adjacent ProSe-enabled UEs, without going through any network node, using NR technology.
- ProSe UE-to-Network Relay (hereinafter referred to as relay UE), or 5G ProSe UE-to-Network Relay, is a UE that provides the function of supporting remote UE and network connection.
- sidelink communication Direct communication between two or more adjacent UEs without going through any network nodes.
- FIG. 1 is a schematic diagram of a scenario in which a remote UE connects to a network through a relay UE.
- the core network accessed by the relay UE is a 5G core network (5G core, 5GC) or an evolved packet core network (evolved packet core, EPC) as an example.
- 5G core 5G core
- EPC evolved packet core network
- NR sidelink communication or sidelink communication can be used on the PC5 interface between the remote UE and the relay UE.
- the remote UE and the relay UE are connected through the PC5 interface
- the relay UE and the radio access network (RAN) are connected through the Uu interface.
- RAN radio access network
- SL transfers are between a pair of source and destination.
- the source can be identified by the source layer 2 (source layer-2) identification number (ID), and the destination can be identified by the destination layer-2 ID.
- the source layer-2 ID can be used to identify the sender of the data in the SL communication, and the destination layer-2 ID can be used to identify the target or the receiver of the data in the SL communication.
- the sender refers to the source of the SL communication (or a media access control (MAC) protocol data unit (PDU)), and the receiver refers to the SL communication (or a MAC PDU) the destination.
- MAC media access control
- NR sidelink communication enables the access layer function of vehicle to everything (vehicle to everything) V2X communication between two or more UEs. Using NR technology, it does not pass through any network nodes. NR sidelink communication can also enable 5G ProSe Direct Communication.
- PC5 reference point/interface reference point/interface between UEs.
- Uu reference point/interface UE and radio access network (eg, next generation (NG)-RAN, evolved universal mobile telecommunications system terrestrial radio access network, E- UTRAN)) reference point/interface.
- radio access network eg, next generation (NG)-RAN, evolved universal mobile telecommunications system terrestrial radio access network, E- UTRAN
- PC5 - radio resource control (radio resource control, RRC) connection is a logical connection between two UEs of a source and destination pair. After the PC5 unicast link (PC5 unicast link) between the two UEs is established, the corresponding PC5-RRC connection is established. There is a one-to-one correspondence between PC5-RRC connections and PC5 unicast links.
- RRC radio resource control
- UE relay technologies include layer 2 relay technology and layer 3 relay technology.
- Layer 2 relay technology is also called Layer 2 UE-to-Network Relay (L2 UE-to-Network Relay).
- L2 UE-to-Network Relay Layer 2 UE-to-Network Relay
- the remote UE can establish an RRC connection with the base station through the relay UE, and the remote UE is controlled by the serving cell of the relay UE.
- the control plane data between the remote terminal equipment and the radio access network equipment is forwarded at the radio link control (radio link control, RLC) layer or the adaptation layer through the relay terminal equipment.
- RLC radio link control
- the service data adaptation protocol (SDAP), packet data convergence protocol (PDCP) layer and RRC layer on the Uu interface of the remote terminal equipment are used in the remote terminal equipment and the wireless access network equipment. are connected end-to-end.
- SDAP service data adaptation protocol
- PDCP packet data convergence protocol
- RRC layer on the Uu interface of the remote terminal equipment are used in the remote terminal equipment and the wireless access network equipment. are connected end-to-end.
- the RLC layer, MAC layer and physical (PHY) layer are end-to-end between remote terminal equipment and relay terminal equipment, and between relay terminal equipment and radio access network equipment.
- the remote terminal device can communicate with each other. Transmission of control signaling between radio access network devices.
- the Uu radio bearer (RB) of the remote terminal equipment is transmitted through the RLC bearer between the remote terminal equipment and the relay terminal equipment and the RLC bearer between the relay terminal equipment and the access network equipment.
- the adaptation layer on the Uu interface is used to identify the remote terminal equipment and the Uu RB of the remote terminal equipment.
- the PC5 interface does not support the adaptation layer
- the PC5 interface can support the adaptation layer.
- the RLC channel in FIG. 2A or FIG. 2B refers to the RLC channel.
- Uu RB refers to the RB between the UE and the access network equipment.
- the Uu RB of the remote terminal device described in this paper can also be called the end-to-end radio bearer of the remote terminal device.
- the RB defines the data packet processing method, and an RB provides services for the data packet with the same data packet processing method.
- RB is divided into signaling radio bearer (signaling radio bearer, SRB) and data radio bearer (data radio bearer, DRB).
- SRB signaling radio bearer
- DRB data radio bearer
- the SRB is used to transmit control plane data, and can also be used to transmit RRC messages and non-access stratum (non-access stratum, NAS) messages.
- DRB is used to transmit user plane data.
- the PDCP sublayer provides RBs to the SDAP sublayer.
- Layer 3 relay technology is also called Layer 3 UE-to-Network Relay (L3 UE-to-Network Relay).
- the relay terminal device performs relay based on the internet protocol (IP) layer.
- IP internet protocol
- the access network equipment cannot sense the existence of the remote terminal equipment, but can only sense the existence of the relay terminal equipment. That is to say, when the information sent by the remote terminal device reaches the access network device, the access network device does not parse it, but directly forwards it to the core network device. In this case, it can be considered that the remote terminal device communicates with the core network device through the relay terminal device. device communication.
- the UE considers that it has detected the RLF with a certain destination, and considers that the PC5-RRC connection with the destination is released, then the physical layer of the UE can indicate to the upper layer of the RRC layer of the UE that the PC5-RRC connection with the destination is released.
- the RRC connection is released (ie PC5 is not available).
- the UE sends a sidelink UE information NR (sidelink UE information NR) message to the base station, which contains a sidelink failure list (sl-FailureList), sl- FailureList contains one or more SL-Failure information elements (information element, IE), wherein each SL-Failure IE may include SL destination identity IE (sl-DestinationIdentity IE) and sl-Failure, the SL-Failure IE includes sl-Failure can also be regarded as an IE, or as a message.
- SL-FailureList sidelink failure list
- sl- FailureList contains one or more SL-Failure information elements (information element, IE)
- SL-Failure IE may include SL destination identity IE (sl-DestinationIdentity IE) and sl-Failure
- the SL-Failure IE includes sl-Fail
- sl-DestinationIdentity is used to indicate the destination information of the unicast connection in which the SL failure occurs
- sl-Failure is used to indicate the reason for the SL failure.
- the UE can set the value of the sideline target identity (sl-DestinationIdentity) in SL-Failure to the destination identity of the destination, and can set the value of sl-Failure in SL-Failure IE to rlf, and set the value of sl-Failure to rlf.
- the value is set to rlf, which can be used to indicate that the reason for SL failure is that SL RLF occurred.
- case 1 can be any of the following 4 cases: 1.
- the number of sidelink RLC retransmissions of the destination of the UE reaches the maximum number of times; 2.
- the connection of the destination is automatically retransmitted by hybrid
- the number of discontinuous transmissions (DTX) reaches the maximum number of transmission requests (hybrid automatic repeat request, HARQ); 4.
- SL-signaling radio bearer (signaling radio bearer, SRB) 2 or SL-SRB3 integrity check of the destination fail.
- the number of nouns means “singular nouns or plural nouns", that is, “one or more”. "At least one” means one or more, and “plurality” means two or more. "And/or”, which describes the relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, it can indicate that A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural.
- the character “/" generally indicates that the related objects are an "or” relationship. For example, A/B, means: A or B.
- At least one item(s) below or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s).
- at least one of a, b, or c means: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c Can be single or multiple.
- the ordinal numbers such as "first" and “second” mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the size, content, order, timing, priority, or importance of multiple objects.
- the first RSRP threshold and the second RSRP threshold may be the same RSRP threshold or different RSRP thresholds, and this name does not indicate the amount of information, the value, and the priority of the two RSRP thresholds. level or importance.
- the numbering of the steps in the various embodiments introduced in this application is only to distinguish different steps, and is not used to limit the sequence of steps. For example, step S501 may occur before step S502, or may occur after step S502, or may also occur simultaneously with step S502.
- FIG. 3A it is a schematic diagram of an application scenario of an embodiment of the present application.
- the remote terminal device is connected with the relay terminal device, and the remote terminal device can communicate with the network device through the relay terminal device.
- FIG. 3B it is a schematic diagram of another application scenario of the embodiment of the present application.
- the remote terminal device is connected to the relay terminal device, and the remote terminal device can communicate with the network device through the relay terminal device.
- the difference between FIG. 3A and FIG. 3B is that, in FIG. 3A , the remote terminal device is in-coverage, and in FIG. 3B , the remote terminal device is out-of-coverage.
- the network device in FIG. 3A or FIG. 3B is, for example, an access network device, and the access network device is, for example, a base station.
- the access network equipment corresponds to different equipment in different systems, for example, in a 4G system, it may correspond to an eNB, and in a 5G system, it corresponds to an access network equipment in 5G, such as a gNB.
- the technical solutions provided in the embodiments of the present application can also be applied to future mobile communication systems, so the access network device in FIG. 3A or FIG. 3B can also correspond to network devices in future mobile communication systems.
- the embodiments of the present application take the access network device being a base station as an example.
- the access network device may also be a device such as an RSU.
- the RLC bearer is a lower layer part of the radio bearer
- the RLC bearer configuration is the lower layer part of the radio bearer configuration, including the RLC configuration and the logical channel configuration.
- Establishing the RLC bearer includes establishing the RLC entity and configuring the corresponding logical channel
- releasing the RLC bearer includes releasing the RLC entity and releasing the corresponding logical channel.
- the "remote UE” described later can be replaced with “the first terminal equipment”, the “relay UE” or “relay UE1” described later can be replaced with the second terminal equipment, the "new terminal equipment” described later "relay UE” or “relay UE 2" can be replaced by a third terminal device.
- Various embodiments of the present application are applicable to the control plane protocol stack architecture shown in FIG. 2A or FIG. 2B .
- FIG. 4 is a flowchart of the method.
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE described hereinafter may be FIG.
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3B
- the relay UE described hereinafter may be is a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B .
- the remote UE communicates with the first network device through the relay UE.
- the remote UE is far away from the network device (for example, it is not within the coverage of the network device), or the remote UE is at the edge of the coverage of the network device, or the link quality between the remote UE and the network device is poor, or the remote UE cannot If it is directly served by a network device, or the remote UE does not have the Uu interface set, or the remote UE has low power, or the remote UE is in the energy-saving mode, or the remote UE wants to save power consumption, etc., the remote UE can access the network through the relay UE, and the relay UE Provide relay service for remote UE.
- the remote UE may establish an RRC connection with the first network device through the relay UE. When the remote UE is in the RRC connection state, it can transmit data with the first network device through the relay UE.
- the remote UE can send the first data to the relay UE, and the first data needs to be sent to the first network device. Then, after receiving the first data from the remote UE, the relay UE sends the first data to the first network device.
- the first network device sends second data to the relay UE, and the second data needs to be sent to the remote UE. Then, after receiving the second data from the first network device, the relay UE can send the second data to the remote UE. In this way, the remote UE and the first network device implement communication through the relay UE.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE. In various embodiments of this application, the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE. It can also be understood that the remote UE determines that a link failure occurs between the remote UE and the first network device, or the remote UE determines that a link failure occurs between the remote UE and the first network device. The link fails, or the remote UE determines that normal communication cannot be performed, or the remote UE determines that the RRC connection needs to be reestablished.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE. For another example, if the first protocol layer of the remote UE requests to release the connection between the remote UE and the relay UE, the remote UE may determine that the relay UE cannot continue to provide relay services for the remote UE. For another example, if the connection between the remote UE and the relay UE is released, the remote UE may determine that the relay UE cannot continue to provide relay services for the remote UE.
- the relay UE may send third indication information to the remote UE, and the third indication information may instruct to perform RRC re-establishment (in this case, the The three indication information may also be called RRC re-establishment indication information), or may indicate that the relay UE has RLF (in this case, the third indication information may also be called RLF indication information), after the remote UE receives the third indication information , it can be determined that the relay UE cannot continue to provide relay services for the remote UE.
- the relay UE may initiate RRC connection re-establishment, for example, the relay UE may perform cell selection. If the relay UE selects a suitable cell, the relay UE can send the identity of the cell to the remote UE. After the remote UE receives the identity of the cell, it can be determined that the relay UE cannot continue to provide relay services for the remote UE.
- the relay UE may initiate RRC connection re-establishment, for example, the relay UE may perform cell selection. If the relay UE selects a suitable cell, the relay UE can send the identity of the cell to the remote UE. After the remote UE receives the identity of the cell, it can be determined that the relay UE cannot continue to provide relay services for the remote UE.
- the remote UE may also determine that the relay UE cannot continue to provide relay services for the remote UE through other methods.
- the connection between the remote UE and the relay UE is, for example, a PC5-RRC connection or a PC5 unicast link
- the first protocol layer is, for example, a PC5-S layer, or other protocol layers in the remote UE.
- the remote UE initiates RRC re-establishment in the first manner.
- the first method is, for example, a method of initiating RRC re-establishment through a Uu interface, or a method of initiating RRC re-establishment through a new relay UE, or a method of continuing to initiate RRC re-establishment through the relay UE.
- the method of initiating RRC connection re-establishment through the Uu interface means that the remote UE directly connects to the network device without connecting the network device through the relay UE, that is, the RB of the remote UE is connected to the network through the remote UE and the network device.
- RLC bearer transmission between devices is, for example, a method of initiating RRC re-establishment through a Uu interface, or a method of initiating RRC re-establishment through a new relay UE, or a method of continuing to initiate RRC re-establishment through the relay UE.
- the method of initiating RRC connection re-establishment through the new relay UE means that the remote UE is connected to the network device through the new relay UE, and the layer 2 relay protocol stack shown in FIG. 2A or FIG. 2B can be used.
- the RB of the remote UE is transmitted through the sidelink RLC bearer between the remote UE and the new relay UE and the RLC bearer between the new relay UE and the network device.
- the method of initiating RRC connection re-establishment through the relay UE means that the remote UE is connected to the network device through the relay UE, and the layer 2 relay protocol stack architecture shown in FIG. 2A or FIG. 2B is used, wherein , the RB of the remote UE is transmitted through the sidelink RLC bearer between the remote UE and the relay UE and the RLC bearer between the relay UE and the network device.
- the remote UE detects an SL RLF with the relay UE, or the first protocol layer of the remote UE requests to release the connection between the remote UE and the relay UE, or the connection between the remote UE and the relay UE is released, then The remote UE can determine that the relay UE cannot continue to provide relay services for the remote UE, then the first method is, for example, the method of initiating RRC re-establishment through the Uu interface, or the method of initiating RRC re-establishment through the new relay UE.
- the relay UE may send third indication information to the remote UE, and the remote UE may determine according to the third indication information that the relay UE cannot continue to provide relay for the remote UE service, the first method is, for example, the method of initiating RRC re-establishment through the Uu interface, or the method of initiating RRC re-establishment through a new relay UE, or the method of continuing to initiate RRC re-establishment through the relay UE.
- the first manner is determined according to the first information, for example.
- the first information can be specified by a protocol.
- the protocol specifies that if the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the remote UE initiates RRC re-establishment through the Uu interface, or through the Uu interface.
- the new relay UE initiates RRC re-establishment, or continues to initiate RRC re-establishment through the relay UE.
- the remote UE may not need to perform the step of determining the first method.
- the embodiment of this application may not involve the first information, and the remote UE only needs to perform the step of determining the first method. You can perform the corresponding operations according to the provisions of the agreement.
- the first information may come from a network device.
- the first network device sends the first information to the remote UE through the relay UE.
- the remote UE receives the first information from the first network device through the relay UE. information.
- the first information may indicate that RRC re-establishment is initiated through the Uu interface, or that RRC re-establishment is initiated through a new relay UE, or RRC re-establishment is initiated through the relay UE.
- the remote UE may determine the first mode according to the indication of the first information, thereby initiating RRC re-establishment.
- the remote UE determines according to the third indication information that the relay UE cannot continue to provide relay services for the remote UE, then the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE.
- RRC re-establishment can be initiated through the Uu interface, or RRC re-establishment can be initiated through a new relay UE, or RRC re-establishment can be initiated through the relay UE.
- the remote UE can also send a message to the relay UE.
- information such as indicating that RRC re-establishment is not performed through the relay UE, or the information such as indicating the release of the PC5 unicast link with the relay UE, or the information such as indicating the release of the PC5-RRC connection between the relay UE and the relay UE .
- the relay UE After the relay UE receives the information, it can determine that the remote UE does not perform RRC re-establishment through the relay UE.
- the first information may be acquired by the remote UE.
- the first information includes the reference signal receiving power (reference signal receiving power, RSRP) of the cell selected by the remote UE, or the first information includes the RSRP of the new relay UE selected by the remote UE, or the first information includes the remote UE The RSRP of the selected cell and the RSRP of the new relay UE selected by the remote UE.
- the RSRP of the relay UE is, for example, the SL-RSRP of the relay UE, or the RSRP corresponding to the discovery message from the relay UE.
- the first method is to perform RRC re-establishment through the Uu interface
- the remote UE can perform RRC re-establishment through the Uu interface.
- the remote UE has selected a suitable cell, and the RSRP of the selected cell is less than or equal to the first RSRP threshold, then the first method is to perform RRC re-establishment through the Uu interface, and the remote UE can perform RRC re-establishment through the Uu interface.
- the remote UE has selected a suitable cell, the RSRP of the selected cell is less than or equal to the first RSRP threshold, and the remote UE has selected a new relay UE, then the first method is to perform RRC re-establishment through the new relay UE , the remote UE can perform RRC re-establishment through the new relay UE.
- the first method is to perform RRC re-establishment through the Uu interface, and the remote UE can perform RRC re-establishment through the Uu interface.
- the remote UE has selected a suitable cell, and the RSRP of the selected cell is greater than the first RSRP threshold, then the first method is to perform RRC re-establishment through the Uu interface, and the remote UE can perform RRC re-establishment through the Uu interface.
- the first method is to perform RRC re-establishment through the Uu interface. RRC re-establishment can be performed through the Uu interface.
- the first method is to perform RRC re-establishment through the new relay UE, and the remote UE can perform RRC re-establishment through the new relay UE.
- the remote UE has selected a new relay UE and a suitable cell, and the difference between the RSRP of the selected cell and the RSRP of the new relay UE is less than or equal to the first RSRP threshold, indicating that the remote UE has passed the new relay.
- the UE performs RRC re-establishment, and the signal quality will be better.
- the first method is to perform RRC re-establishment through a new relay UE, and the remote UE can perform RRC re-establishment through the new relay UE.
- the first RSRP threshold can be specified by a protocol, for example, or can also be configured by a network device.
- the first manner may not be determined according to the first information, but may be determined according to the cell selection process of the remote UE and/or the selection process of the new relay UE. For example, if the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the remote UE can perform cell selection and can select a new relay UE. If the remote UE first selects a suitable cell, the first method is to initiate RRC re-establishment through the Uu interface, and if the remote UE first selects a new relay UE, the first method is to initiate RRC re-establishment through the new relay UE. the way to build.
- the remote UE can perform cell selection.
- the first method is to initiate RRC re-establishment through the Uu interface.
- the remote UE fails to initiate RRC re-establishment through the Uu interface, the remote UE can select a new relay UE.
- the first method is to initiate RRC re-establishment through the new relay UE.
- the remote UE initiates RRC re-establishment, for example, the remote UE sends an RRC re-establishment request message.
- the remote UE initiates RRC re-establishment through the Uu interface, which may include the remote UE sending an RRC re-establishment request message to the corresponding network device through the Uu interface;
- the remote UE initiates RRC re-establishment through the new relay UE, which may include the remote UE Send an RRC re-establishment request message to the network device corresponding to the serving cell of the new relay UE through the new relay UE; for another example, the remote UE initiates RRC re-establishment through the original relay UE, which may include the remote UE sending the RRC re-establishment message to the original relay UE through the original relay UE.
- the network device corresponding to the serving cell sends an RRC re-establishment request message.
- the new relay UE (for example, relay UE 2 in the following) selected by the remote UE may be the same as the original relay UE (for example, the relay UE 1 in the following text). UE, or may also be a different UE.
- the specific process of the remote UE initiating RRC re-establishment and other contents will also be introduced in other embodiments later.
- the remote UE can initiate RRC re-establishment to restore the service of the remote UE as soon as possible.
- the remote UE can choose the way to initiate RRC re-establishment, for example, it can initiate RRC re-establishment through the Uu interface, or it can initiate RRC re-establishment through the new relay UE, or it can continue to initiate RRC re-establishment through the original relay UE, etc., so that the remote UE can initiate RRC re-establishment through the Uu interface.
- the way of initiating RRC re-establishment is more flexible.
- the remote UE can select a better way to initiate RRC re-establishment according to factors such as network quality, which improves the success rate of RRC re-establishment, improves the service continuity of the first terminal device, and reduces the risk of service discontinuity. packet loss.
- FIG. 5 is a flowchart of the method.
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE described hereinafter may be FIG.
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3B
- the relay UE described hereinafter may be is a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B .
- the remote UE communicates with the first network device through the relay UE.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE. For another example, if the first protocol layer of the remote UE requests to release the connection between the remote UE and the relay UE, the remote UE may determine that the relay UE cannot continue to provide relay services for the remote UE. For another example, if the connection between the remote UE and the relay UE is released, the remote UE may determine that the relay UE cannot continue to provide relay services for the remote UE. Alternatively, the remote UE may also determine that the relay UE cannot continue to provide relay services for the remote UE through other methods.
- the connection between the remote UE and the relay UE is, for example, a PC5-RRC connection or a PC5 unicast link, and the first protocol layer is, for example, a PC5-S layer, or other protocol layers in the remote UE.
- the embodiment of the present application may be applied in combination with the embodiment shown in FIG. 4 .
- the embodiment of the present application may be regarded as a refinement of the embodiment shown in FIG. 4 . If this is the case, then after S502, the remote UE may determine the first mode.
- the first manner determined by the remote UE in the embodiment of the present application is a manner of initiating RRC re-establishment through the Uu interface.
- the embodiment of the present application and the embodiment shown in FIG. 4 may not be combined, but are separately applied.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the remote UE does not need to select a method of initiating RRC re-establishment, but initiates RRC re-establishment through the Uu interface.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the remote UE does not need to reselect a new relay UE, nor does it need to initiate RRC re-establishment through the original relay UE, but instead uses the Uu
- the interface initiates RRC re-establishment, which reduces the probability of service interruption of the remote UE due to the inability of the network device to configure the new relay UE, and also reduces the failure probability of RRC re-establishment through the original relay UE, improving the service of the remote UE. Continuity also reduces packet loss caused by remote UE service interruption.
- the following describes the process of RRC re-establishment by the remote UE through the Uu interface.
- the remote UE starts a first timer.
- the first timer may be used to stop when the remote UE selects a suitable cell.
- the first timer is started; or, once the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the first timer is started; or, the remote UE is initiating RRC re-establishment.
- the cell selection will be performed, and before the cell selection is performed, the remote UE starts the first timer.
- the remote UE may also start the first timer in other cases.
- the first timer is, for example, timer T311, or other timers.
- the remote UE suspends all RBs except the second SRB.
- the RB suspended by the remote UE is the Uu RB.
- the second SRB is, for example, SRB0, or may also be other SRBs.
- the second SRB is SRB0 as an example.
- the remote UE can also release the SL RLC bearer of the suspended RB.
- the remote UE performs cell selection.
- the remote UE selects an appropriate cell.
- the cell selected by the remote UE is called the first cell, for example, the first cell corresponds to the second network device.
- a cell corresponds to a network device, which can be understood as that the network device provides services of the cell, for example, the network device is an access network device, such as a base station.
- the second network device provides the service of the second cell, for example, the second network device is an access network device.
- the second network device is not shown in either FIG. 3A or FIG. 3B , but it can be understood that the second network device can communicate with the remote terminal device.
- the second network device and the first network device may be the same network device, or may be different network devices. If the remote UE selects a suitable cell, it can stop the first timer. Enter S508.
- S506 and S507 are two parallel schemes, and one of the schemes is executed according to the cell selection situation of the remote UE.
- the remote UE establishes the RLC bearer of SRB0.
- the remote UE may apply the common control channel (common control channel, CCCH) configuration specified in the protocol to establish the RLC bearer of the SRB0, and the configuration may be referred to as a specified configuration (specified configuration).
- CCCH common control channel
- the RLC bearer of SRB0 may always exist, and the remote UE may not execute S508 without establishing. Therefore S508 is an optional step.
- the remote UE determines the value of the short MAC-I (shortMAC-I).
- the remote UE When the remote UE performs RRC re-establishment, it needs to send an RRC re-establishment request (RRC reestablishment request) message to the second network device corresponding to the selected first cell, and the RRC re-establishment request message includes shortMAC-I, so the remote UE needs to determine the shortMAC The value of -I. For example, the remote UE may determine the value of shortMAC-1 according to the identifier of the first cell (eg, the ID of the first cell, etc.).
- the remote UE establishes or rebuilds the PDCP entity of the first SRB.
- the first SRB is, for example, SRB1, or may also be other SRBs.
- the first SRB is SRB1 as an example.
- the remote UE establishes or rebuilds the SL RLC bearer of the SRB1.
- the remote UE applies the default configuration of SRB1. This default configuration can be specified in the protocol.
- the remote UE restores SRB1.
- the remote UE may suspend SRB1 in S504, and the remote UE performs RRC re-establishment, and needs to send an RRC re-establishment request message to the second network device corresponding to the selected first cell, and the second network device receives the RRC re-establishment request message.
- an RRC reestablishment message (RRC reestablishment) should be sent to the remote UE, and the RRC reestablishment message will be transmitted through SRB1, so the remote UE needs to restore SRB1 before receiving the RRC reestablishment message.
- the remote UE sends an RRC re-establishment request message to the second network device, and correspondingly, the second network device receives the RRC re-establishment request message from the remote UE.
- the RRC re-establishment request message may be transmitted through the SRB0 of the remote UE.
- the second network device sends an RRC reestablishment (RRC reestablishment) message to the remote UE, and correspondingly, the remote UE receives the RRC reestablishment message from the second network device.
- RRC reestablishment RRC reestablishment
- the RRC re-establishment message can be transmitted through the SRB1 of the remote UE.
- the remote UE sends an RRC reestablishment complete (RRC reestablishment complete) message to the second network device, and correspondingly, the second network device receives the RRC reestablishment complete message from the remote UE.
- RRC reestablishment complete RRC reestablishment complete
- the remote UE completes the RRC re-establishment process through the Uu interface.
- the second network device can establish the RB of the remote UE through the RRC reconfiguration process, or modify the RB of the remote UE, or release the RB of the remote UE, etc., thereby restoring the data transmission of the remote UE.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the remote UE can initiate RRC re-establishment through the Uu interface, which is equivalent to that the remote UE can re-establish the RRC connection with the network device by itself, There is no need to select a new relay UE, which reduces the probability that the remote UE service cannot continue because the new relay UE cannot be configured, improves the service continuity of the remote UE, and reduces the loss caused by service discontinuity. Bag.
- FIG. 6 is a flowchart of the method.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the remote UE can select a new relay UE and pass The new relay UE accesses the network.
- the remote UE described below may be a remote terminal device in the network architecture shown in FIG. 3A, and the relay UE 1 described below may be In the relay terminal device in the network architecture shown in FIG.
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3B
- the relay UE 1 described hereinafter It may be a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B .
- the relay UE 2 and the second network device described below are not shown in FIG. 3A or FIG. 3B.
- the remote UE communicates with the first network device through the relay UE 1.
- S601 For more content of S601, reference may be made to S401 in the embodiment shown in FIG. 4 .
- the remote UE determines that the relay UE 1 cannot continue to provide a relay service for the remote UE.
- the embodiment of the present application may be applied in combination with the embodiment shown in FIG. 4 .
- the embodiment of the present application may be regarded as a refinement of the embodiment shown in FIG. 4 . If this is the case, then after S602, the remote UE may determine the first mode.
- the first manner determined by the remote UE in the embodiment of the present application is a manner of initiating RRC re-establishment through a new relay UE.
- the embodiment of the present application and the embodiment shown in FIG. 4 may not be combined, but are separately applied.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the remote UE does not need to select a method of initiating RRC re-establishment, but initiates RRC re-establishment through a new relay UE.
- the remote UE can select a new relay UE to initiate RRC re-establishment through the new relay UE. That is to say, if the remote UE determines that the relay UE 1 cannot continue to provide relay services for the remote UE, the remote UE can select a new relay UE to restore the service, which improves the service continuity of the remote UE and reduces the service of the remote UE. Packet loss caused by interruption.
- the following describes the process of selecting a new relay UE by the remote UE and re-establishing RRC through the new relay UE.
- the remote UE starts a second timer.
- the second timer may be used to stop when the remote UE selects a new relay UE.
- the second timer is started; or, once the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the second timer is started; or, the remote UE is selecting a new relay UE Before, start the second timer. Or the remote UE can also start the second timer in other cases.
- the second timer is, for example, the timer T311, or other timers.
- the remote UE suspends all RBs except the second SRB.
- the RB suspended by the remote UE is the Uu RB.
- the second SRB is, for example, SRB0, or may also be other SRBs. In this embodiment of the present application, the second SRB is SRB0 as an example.
- the remote UE can also release the SL RLC bearer of the suspended RB.
- the remote UE selects or reselects a new relay UE.
- the remote UE may measure other relay UEs, etc., to reselect the UE that can provide relay services for the remote UE as the new relay UE.
- the remote UE stops the second timer.
- the second timer can be stopped, and the new relay UE is hereinafter referred to as the third terminal device, or is referred to as relay UE 2.
- the second timer can be stopped, and the connection between the remote UE and the relay UE 2 is, for example, a PC5-RRC connection or a PC5 single broadcast link.
- the remote UE selects the relay UE 2
- the remote UE obtains the identity of the serving cell of the relay UE 2
- the second timer may be stopped.
- the remote UE can start a third timer, such as It is timer T301, or it can be other timers.
- the third timer is not the timer T301, and the timing duration of the third timer is greater than or equal to the timing duration of the timer T301.
- the third timer may be used for the remote UE to receive the RRC re-establishment message.
- the remote UE may first establish a connection with the relay UE 2, and after the connection is established, obtain the identity of the serving cell of the relay UE 2 from the relay UE 2. Alternatively, before the remote UE establishes a connection with the relay UE 2, it can obtain the identity of the serving cell of the relay UE 2 from the relay UE 2. Alternatively, in the process of establishing a connection with the relay UE 2, the remote UE may obtain the identity of the serving cell of the relay UE 2 from the relay UE 2.
- the identifier of the cell is, for example, the ID of the cell.
- the relay UE can send the ID of the serving cell of the relay UE through a 5G ProSe Direct Communication message or a PC5 direct discovery (PC5 direct discovery) message.
- the cell ID notification request procedure Cell ID announcement request procedure
- the remote UE sends a CELL_ID_ANNOUNCEMENT_REQUEST message to the relay UE 2
- the relay UE sends a cell ID notification response (CELL_ID_ANNOUNCEMENT_RESPONSE) to the remote UE after receiving the message. ) message, wherein the CELL_ID_ANNOUNCEMENT_RESPONSE message may contain or indicate the ID of the serving cell of the relay UE 2.
- the relay UE 2 sends a relay discovery additional information (relay discovery additional information) message, the message contains or indicates the ID of the serving cell of the relay UE 2, and the remote UE can obtain the ID of the serving cell of the relay UE 2 after receiving the message.
- relay discovery additional information relay discovery additional information
- the remote UE stops the second timer when a new relay UE is selected, or when the remote UE selects the relay UE 2 and the connection with the relay UE 2 is completed, the second timer is stopped, then go to S608 Or, if the remote UE stops the second timer when the relay UE 2 is selected and the identity of the serving cell of the relay UE 2 is obtained, then enter S609.
- S606 and S607 are two parallel schemes, and one of the schemes is executed according to the selection of the remote UE for the relay UE.
- the remote UE obtains the identifier of the serving cell of the relay UE 2.
- the remote UE If the remote UE needs to perform RRC re-establishment through relay UE 2, the remote UE will initiate the transmission of the RRC re-establishment request message.
- the RRC re-establishment request message contains shortMAC-I, and the remote UE needs to calculate shortMAC-I according to the ID of the cell that initiates RRC re-establishment. Since the remote UE performs RRC re-establishment through the relay UE 2, the cell that initiates the RRC re-establishment is the serving cell of the relay UE 2. Therefore, the remote UE needs to obtain the identifier of the serving cell of the relay UE 2.
- the remote UE stops the second timer when a new relay UE is selected, or the remote UE stops the second timer when it selects the relay UE 2 and establishes a connection with the relay UE 2, then the remote UE stops the second timer. If the identifier of the serving cell of relay UE 2 has not been obtained, the remote UE needs to execute S608. For the method for the remote UE to obtain the identity of the serving cell of the relay UE 2, please refer to the introduction of S606.
- the remote UE After the remote UE obtains the identity of the serving cell of the relay UE 2, it can determine the shortMAC-I according to the identity of the serving cell of the relay UE 2.
- the remote UE rebuilds the PDCP entity of the first SRB, and establishes the first RLC bearer of the first SRB, and restores SRB1.
- the first RLC bearer of the first SRB is, for example, the SL RLC bearer of the first SRB.
- the first SRB is, for example, SRB1, or other SRBs. In this embodiment of the present application, the first SRB is SRB1 as an example.
- the remote UE After sending the RRC re-establishment request message, the remote UE needs to receive the RRC re-establishment message.
- the RRC re-establishment message is transmitted through SRB1, so the remote UE can restore SRB1.
- the remote UE may apply the PDCP default configuration (default configuration) or the specified configuration (specified configuration) of SRB1, and the default configuration or the specified configuration may be specified by the protocol.
- the remote UE can apply the SL RLC default configuration (default configuration) or the specified configuration (specified configuration) of the SRB1, and the default configuration or the specified configuration can be specified by the protocol.
- the remote UE After the remote UE establishes a PC5 unicast link or a PC5-RRC connection with the relay UE 2, if the remote UE wants to initiate RRC re-establishment or RRC connection recovery, the remote UE can optionally send an RRC re-establishment request message or RRC Before the recovery request message, or when sending the RRC re-establishment request message or the RRC recovery request message, or after sending the RRC re-establishment request message or the RRC recovery request message, the SL RLC bearer of SRB1 is established using the default configuration or the specified configuration.
- the SL RLC bearer of the SRB may be the SL RLC bearer that is peered to the relay UE (eg, relay UE 2).
- the remote UE receives the indication information 1 of the SL RLC bearer of the rebuilt SRB1 or the indication information 2 of the SL RLC bearer of the SRB1 from the serving cell of the relay UE 2 forwarded by the relay UE 2 Then, the SL RLC bearer of SRB1 is established.
- the indication information 1 or the indication information 2 indicates the configuration information
- the remote UE can apply the configuration information to establish the SL RLC bearer of the SRB1; if the indication information 1 or the indication information 2 does not indicate the configuration information, the remote UE can apply the default configuration Or the specified configuration establishes the SL RLC bearer of SRB1.
- the indication information 1 or the indication information 2 may be sent through the RRC connection establishment message.
- the remote UE may not rebuild the PDCP entity of SRB1, but may establish the SL RLC bearer of SRB1 to restore SRB1, Alternatively, the remote UE may not rebuild the PDCP entity of SRB1 nor establish the SL RLC bearer of SRB1 to restore SRB1.
- the remote UE can initiate different processes such as RRC re-establishment, RRC connection recovery or RRC connection establishment.
- the remote UE initiates RRC re-establishment as an example.
- the remote UE sends the data of SRB0 to the relay UE 2, and correspondingly, the relay UE 2 receives the data of the SRB0 from the remote UE.
- the data of SRB0 is, for example, an RLC service data unit (service data unit, SDU), and the RLC PDU may include an RRC re-establishment request message.
- the remote UE may send the RLC SDU to the relay UE 2 through the SL RLC bearer corresponding to the SRB0, and the relay UE 2 receives the RLC SDU.
- the RLC SDU is to be sent to the second network device.
- the second network device is the network device accessed by the relay UE 2. When the remote UE sends a message to the second network device, it needs to be relayed by the relay UE 2. Therefore, the remote UE 2 sends the message to the second network device.
- the data of SRB0 is sent to relay UE 2.
- the relay UE 2 establishes or re-establishes the RLC bearer corresponding to the SRB1 of the remote UE. For example, the relay UE 2 may establish or re-establish the RLC bearer using a default configuration or a specified configuration, which may be specified by a protocol.
- the RLC bearer of SRB1 may include at least one of the first RLC bearers between the remote UE and the relay UE 2, and may also include the second RLC bearer between the remote UE and the second network device.
- the first RLC bearer is, for example, an SL RLC bearer
- the second RLC bearer is, for example, a Uu RLC bearer.
- a triggering manner is that after relay UE 2 receives the data of SRB0, it can establish or rebuild the RLC bearer of SRB1. After the relay UE 2 receives the data of the SRB0, it can determine that the data is the data of the SRB0 of the remote UE according to the SL logical channel where the data of the SRB0 is located.
- the relay UE 2 may, after receiving the data of the SRB0 and before the relay UE 2 sends the data of the SRB0 to the second network device, or when the relay UE 2 sends the data of the SRB0 to the second network device, or After the relay UE 2 sends the data of the SRB0 to the second network device, the relay UE 2 establishes or rebuilds the RLC bearer of the SRB1.
- the RLC bearer of SRB1 established or rebuilt by the relay UE 2 may include the SL RLC bearer of SRB1, or the Uu RLC bearer of SRB1, or the SL RLC bearer of SRB1 and the Uu RLC bearer of SRB1.
- another triggering method is that the second network device sends the first indication information to the relay UE 2, and accordingly, the relay UE 2 receives the first indication information from the second network device, and the first indication information may indicate the establishment or Rebuild the RLC bearer of SRB1, or instruct to receive the data of SRB1 sent by the second network device to the remote UE, or instruct to receive the RRC re-establishment message sent by the second network device to the remote UE, or instruct the remote UE to send the RRC through relay UE2 Rebuild messages, etc.
- the relay UE 2 After the relay UE 2 receives the first indication information, it can establish or rebuild the RLC bearer of the SRB1.
- the RLC bearer of SRB1 established or rebuilt by relay UE 2 may include the SL RLC bearer of SRB1, or the Uu RLC bearer including SRB1, or the SL RLC bearer including SRB1 and the Uu RLC bearer of SRB1; or, if the first indication information indicates the establishment or re-establishment of the SL RLC bearer of SRB1 (for example, for the SL RLC bearer of SRB1 and the Uu RLC bearer of SRB1, the second network device may indicate through different indication information If this is the case, then the second network device can send only
- the RLC bearer of SRB1 that is established or rebuilt may include the Uu RLC bearer of SRB1; or, if the first indication information indicates that the SL RLC bearer of SRB1 and the Uu RLC bearer of SRB1 are established or rebuilt, the relay UE 2 establishes or rebuilds the SRB1
- the RLC bearer of SRB1 may include the SL RLC bearer of SRB1 and the Uu RLC bearer of SRB1.
- the second network device may send the first indication information to the relay UE 2 after receiving the data of the SRB0 forwarded by the relay UE 2. That is to say, if this triggering method is adopted, the relay UE 2 has sent the data of the SRB0 in S610 to the second network device, and the second network device has also received the data of the SRB0.
- the relay UE 2 can follow the first indication information The indicated configuration is used to establish or re-establish the RLC bearer for SRB1. If the first indication information does not indicate the configuration, the relay UE 2 may establish or re-establish the RLC bearer of the SRB1 according to the default configuration or the specified configuration.
- another triggering method is that the remote UE sends the second indication information to the relay UE 2, and accordingly, the relay UE 2 receives the second indication information from the remote UE, and the second indication information may indicate the establishment or reconstruction of the RLC of the SRB1.
- Bearer or instruct to receive the data of SRB1 sent by the second network device to the remote UE, or instruct to receive the RRC re-establishment message sent by the second network device to the remote UE, or instruct the remote UE to send the RRC re-establishment message through relay UE 2, etc.
- the relay UE 2 After the relay UE 2 receives the second indication information, it can establish or re-establish the RLC bearer of the SRB1.
- the second indication information may not be carried in the data of SRB0, then the remote UE may first send the data of SRB0 to relay UE 2, and then send the second indication information to relay UE 2, or the remote UE may first send the data to relay UE 2
- the second indication information and then send the data of SRB0 to the relay UE 2, or the remote UE can send the second indication information and the data of SRB0 to the relay UE 2 at the same time; or, the second indication information can also be carried in the data of SRB0, then The remote UE sends the data of SRB0 to the relay UE 2, and also sends the second indication information, which can save signaling overhead.
- the relay UE 2 does not need to establish the Uu RLC bearer. And if the relay UE 2 has not established the Uu RLC bearer, the relay UE 2 can establish the Uu RLC bearer.
- the relay UE 2 can first enter the RRC connection state, and then establish the Uu RLC corresponding to the SRB1 of the remote UE bear.
- the relay UE 2 sends the data from the SRB0 of the remote UE to the second network device, and correspondingly, the second network device receives the data of the SRB0 from the relay UE 2.
- the relay UE 2 may send the data of the SRB0 to the second network device through the Uu RLC bearer of the SRB0.
- the second network device may send the data of the SRB0 forwarded by the relay UE 2 to the relay UE after receiving the data of the SRB0. 2 Send the first indication information. That is to say, if this triggering method is adopted, the relay UE 2 has sent the data of SRB0 in S610 to the second network device, and the second network device has also received the data of SRB0, then S612 can occur before S611 . However, if the other two triggering methods introduced in S611 are adopted, S612 can occur before S611, or after S611, or simultaneously with S611.
- the second network device sends the data of SRB1 to the remote UE through the relay UE 2.
- the remote UE receives the data of the SRB1 from the second network device through the relay UE 2.
- the data of SRB1 is, for example, an RLC SDU, and the RLC PDU may include an RRC re-establishment message.
- the second network device sends the data of the SRB1 to the relay UE 2, and the relay UE2 receives the data of the SRB1 from the second network device; the relay UE 2 sends the data of the SRB1 to the remote UE, and the remote UE receives the data from the relay The data of this SRB1 of UE 2.
- the relay UE 2 may receive data of the SRB1 from the second network device through the Uu RLC bearer corresponding to the SRB1 of the remote UE, and the relay UE 2 may send the SRB1 to the remote UE through the SL RLC bearer corresponding to the SRB1 of the remote UE
- the remote UE receives the data of the SRB1 from the remote UE 2 through the SL RLC of the SRB1. After receiving the data of the SRB1, the remote UE can submit the data of the SRB1 to the PDCP entity of the SRB1 for processing.
- the remote UE may stop the third timer and execute S614. However, if the remote UE does not receive the data of the SRB1 when the third timer times out, the remote UE can enter the RRC idle state, and the process ends.
- the remote UE sends an RRC re-establishment complete message to the second network device through the relay UE 2.
- the second network device receives the RRC re-establishment complete message from the remote UE through the relay UE 2.
- the remote UE sends the RRC re-establishment complete message to the relay UE 2
- the relay UE 2 receives the RRC re-establishment complete message from the remote UE 2
- the relay UE 2 sends the RRC re-establishment complete message to the second network device
- the second network device receives the RRC re-establishment completion message from relay UE 2.
- the remote UE completes the RRC re-establishment process through the Uu interface.
- the second network device can establish the RB of the remote UE through the RRC reconfiguration process, or modify the RB of the remote UE, or release the RB of the remote UE, etc., thereby restoring the data transmission of the remote UE.
- the remote UE can select the relay UE 2, and initiates RRC re-establishment through the relay UE 2. Since the relay UE 2 can only be used as the relay UE when the signal quality of the cell is good or the relay UE 2 is in the RRC connection state, it can reduce the failure of the RRC connection re-establishment caused by the poor signal quality of the cell when the remote UE performs RRC re-establishment through Uu. situation occurs, which improves the business continuity of the remote UE.
- FIG. 5 and the embodiment shown in FIG. 6 may be applied independently, or may also be applied in combination.
- Several optional combinations of the embodiment shown in FIG. 5 and the embodiment shown in FIG. 6 are described below through several embodiments.
- the following embodiments may be regarded as either the embodiment shown in FIG. 5 and the embodiment shown in FIG. 6 are applied in combination, or may be regarded as several examples of the embodiment shown in FIG. 4 .
- Embodiments of the present application provide a fourth communication method. Please refer to FIG. 7 , which is a flowchart of the method.
- the remote UE described below may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE 1 described below may be In the relay terminal device in the network architecture shown in FIG. 3A
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG.
- the relay UE 1 described hereinafter It may be a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B
- the relay UE 2 and the second network device described below are not shown in FIG. 3A or FIG. 3B.
- the remote UE communicates with the first network device through the relay UE 1.
- the remote UE determines that the relay UE 1 cannot continue to provide relay services for the remote UE.
- the remote UE may determine the first mode according to the cell selection process of the remote UE and/or the selection process of the remote UE for the new relay UE.
- the embodiment shown in FIG. 5 is not combined with the embodiment shown in FIG. 4, and the embodiment shown in FIG. 6 is not combined with the embodiment shown in FIG. The first combination of the embodiment shown in FIG. 5 and the embodiment shown in FIG. 6 is applied.
- the remote UE can initiate RRC re-establishment through Uu, or can also select a new relay UE to initiate the RRC re-establishment through the new relay UE.
- RRC is re-established. In this way, more opportunities for RRC re-establishment can be provided for the remote UE, and the success rate of RRC re-establishment by the remote UE can be improved.
- the remote UE starts a first timer.
- the first timer may be used to stop when the remote selects a suitable cell, or may be used to stop when the remote UE selects a new relay UE.
- the first timer is, for example, timer T311, or other timers. It can be understood that the first timer in the embodiment shown in FIG. 7 can implement the function of the first timer in the embodiment shown in FIG. 5 , or can implement the first timer in the embodiment shown in FIG. 6 . Two timer functions.
- the first timer is started; or, once the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the first timer is started; or, after the remote UE initiates RRC re-establishment Cell selection will be performed, then before cell selection, the remote UE starts the first timer; or, the remote UE starts the first timer before selecting a new relay UE; or, before the remote UE performs cell selection, and in Before selecting a new relay UE, start the first timer.
- the remote UE may also start the first timer in other cases.
- the remote UE suspends all RBs except the second SRB.
- the RB suspended by the remote UE is the Uu RB.
- the second SRB is, for example, SRB0, or may also be other SRBs. In this embodiment of the present application, the second SRB is SRB0 as an example.
- the remote UE can also release the SL RLC bearer of the suspended RB.
- the remote UE selects or reselects a new relay UE; or, the remote UE performs cell selection; or, the remote UE selects or reselects a new relay UE, and performs cell selection.
- the following takes remote UE selection or reselection of a new relay UE and cell selection as an example.
- the remote UE stops the first timer.
- the first timer can be stopped, and the new relay UE is hereinafter referred to as the third terminal equipment, or as relay UE 2.
- the first timer can be stopped, and the connection between the remote UE and the relay UE 2 can be stopped.
- a PC5-RRC connection or a PC5 unicast link For another example, if the remote UE selects the relay UE 2, and the remote UE obtains the identity of the serving cell of the relay UE 2, or the remote UE selects a suitable cell, the first timer may be stopped.
- the remote UE stops the first timer when a new relay UE is selected, the remote UE and the relay UE 2 can establish a connection, for example, a PC5 unicast link establishment process can be performed, or a layer 2 link can be performed. (layer-2 link) build process. If the remote UE2 stops the first timer when the identity of the serving cell of the relay UE2 is obtained, the remote UE can determine the shortMAC-1 according to the identity of the serving cell of the relay UE2.
- the remote UE can also start the second timer.
- the second timer is, for example, the timer T301, or other timers.
- the second timer is not the timer T301, and the timing duration of the second timer is greater than or equal to the timing duration of the timer T301.
- the second timer in the embodiment of the present application is, for example, used for the remote UE to receive the RRC re-establishment message.
- the second timer in the embodiment of the present application may implement the function of the third timer in the embodiment shown in FIG. 6 .
- S706 and S707 are two parallel schemes, and one of the schemes is executed according to the cell selection situation of the remote UE or the selection situation of the new relay UE.
- the remote UE stops the first timer after selecting a suitable cell, it can continue to perform S508-S516 in the embodiment shown in FIG. 5; if the remote UE stops the first timer after selecting a new relay UE, Or the remote UE has selected a new relay UE, and the first timer is stopped after the remote UE has established a connection with the new relay UE, or the remote UE has selected a new relay UE, and the remote UE has obtained the new relay UE. After the identification of the serving cell, the first timer is stopped, and then S608 to S614 in the embodiment shown in FIG. 6 may continue to be performed.
- the remote UE can initiate RRC re-establishment through Uu, or can also select a new relay UE to initiate the RRC re-establishment through the new relay UE. RRC is re-established. In this way, more opportunities for RRC re-establishment can be provided for the remote UE, and the success rate of RRC re-establishment by the remote UE can be improved.
- Embodiments of the present application provide a fifth communication method. Please refer to FIG. 8 , which is a flowchart of the method.
- the remote UE described below may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE 1 described below may be In the relay terminal device in the network architecture shown in FIG. 3A
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG.
- the relay UE 1 described hereinafter It may be a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B
- the relay UE 2 and the second network device described below are not shown in FIG. 3A or FIG. 3B.
- the remote UE communicates with the first network device through the relay UE 1.
- the remote UE determines that the relay UE 1 cannot continue to provide relay services for the remote UE.
- the remote UE determines that the relay UE cannot continue to provide the remote UE with Relay service
- the remote UE can determine the first mode according to the cell selection process of the remote UE and/or the selection process of the remote UE for the new relay UE.
- the embodiment shown in FIG. 5 is not combined with the embodiment shown in FIG. 4, and the embodiment shown in FIG. 6 is not combined with the embodiment shown in FIG.
- the second combination of the embodiment shown in FIG. 5 and the embodiment shown in FIG. 6 is applied.
- the remote UE can initiate RRC re-establishment through Uu, or can also select a new relay UE to initiate the RRC re-establishment through the new relay UE.
- RRC is re-established. In this way, more opportunities for RRC re-establishment can be provided for the remote UE, and the success rate of RRC re-establishment by the remote UE can be improved.
- the remote UE starts the first timer and the second timer.
- the first timer can be used to stop when the remote selects a suitable cell
- the second timer can be used to stop when the remote UE selects a new relay UE.
- the first timer is, for example, timer T311, or other timers. It can be understood that the first timer in the embodiment shown in FIG. 8 can implement the function of the first timer in the embodiment shown in FIG. 5 , and the second timer in the embodiment shown in FIG. 8 It can realize the function of the second timer in the embodiment shown in FIG. 6 .
- the remote UE initiates RRC re-establishment
- the first timer and the second timer are started; or, once the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the first timer and the second timer are started;
- the remote UE will perform cell selection after initiating RRC re-establishment, then before performing cell selection, the remote UE starts the first timer; the remote UE starts the second timer before selecting a new relay UE.
- the remote UE may also start the first timer and the second timer in other cases.
- the remote UE suspends all RBs except the second SRB.
- the RB suspended by the remote UE is the Uu RB.
- the second SRB is, for example, SRB0, or may also be other SRBs. In this embodiment of the present application, the second SRB is SRB0 as an example.
- the remote UE can also release the SL RLC bearer of the suspended RB.
- the remote UE selects or reselects a new relay UE; or, the remote UE performs cell selection; or, the remote UE selects or reselects a new relay UE, and performs cell selection.
- the following takes remote UE selection or reselection of a new relay UE and cell selection as an example.
- the remote UE stops the first timer and the second timer.
- the first timer and the second timer can be stopped.
- the new relay UE is called the third terminal device, or the relay UE 2.
- the remote UE selects the relay UE 2
- the connection between the remote UE and the relay UE 2 is completed, or the remote UE selects a suitable cell
- the first timer and the second timer can be stopped, and the remote UE and the relay UE can be stopped.
- the connection between 2 is, for example, a PC5-RRC connection or a PC5 unicast link.
- the remote UE selects the relay UE 2 and the remote UE obtains the identity of the serving cell of the relay UE 2, or the remote UE selects a suitable cell
- the first timer and the second timer can be stopped.
- the remote UE and the relay UE 2 can establish a connection, for example, the PC5 unicast link establishment process can be performed, or Carry out the layer-2 link establishment process. If the remote UE2 stops the first timer and the second timer when the identity of the serving cell of the relay UE2 is obtained, the remote UE can determine the shortMAC-I according to the identity of the serving cell of the relay UE2.
- the remote UE can also start a third timer, for example, the third timer is timer T301, or can also be other timers.
- the third timer is not the timer T301, and the timing duration of the third timer is greater than or equal to the timing duration of the timer T301.
- the third timer in the embodiment of the present application is, for example, used for the remote UE to receive the RRC re-establishment message.
- the third timer in the embodiment of the present application may implement the function of the third timer in the embodiment shown in FIG. 6 .
- the remote UE stops selecting a cell. If the remote UE does not select an appropriate relay UE when the second timer expires, or the remote UE does not establish a connection with the new relay UE when the second timer expires, or the remote UE does not obtain a new relay UE when the second timer expires the identity of the serving cell, the remote UE stops selecting a new relay UE.
- the remote UE no longer selects a cell, but can continue to select a new relay UE; if the second timer times out but the first timer does not expire, the remote UE The new relay UE is no longer selected, but the cell selection can continue; and if both the first timer and the second timer expire, the remote UE returns to the RRC idle state, and the process ends.
- S806 and S807 are two parallel schemes, and one of the schemes is executed according to the cell selection situation of the remote UE or the selection situation of the new relay UE.
- the remote UE stops the first timer and the second timer after selecting a suitable cell, it can continue to execute S508-S516 in the embodiment shown in FIG. 5; if the remote UE selects a new relay UE, it stops The first timer and the second timer, or the remote UE has selected a new relay UE, and the remote UE has established a connection with the new relay UE to stop the first timer and the second timer, or the remote UE has selected to the The new relay UE stops the first timer and the second timer after the remote UE obtains the identity of the serving cell of the new relay UE, and may continue to perform S608 to S614 in the embodiment shown in FIG. 6 .
- the remote UE can initiate RRC re-establishment through Uu, or can also select a new relay UE to initiate the RRC re-establishment through the new relay UE. RRC is re-established. In this way, more opportunities for RRC re-establishment can be provided for the remote UE, and the success rate of RRC re-establishment by the remote UE can be improved.
- Embodiments of the present application provide a sixth communication method. Please refer to FIG. 9 , which is a flowchart of the method.
- the remote UE described below may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE 1 described below may be In the relay terminal device in the network architecture shown in FIG. 3A
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG.
- the relay UE 1 described hereinafter It may be a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B
- the relay UE 2 and the second network device described below are not shown in FIG. 3A or FIG. 3B.
- the remote UE communicates with the first network device through the relay UE 1.
- the remote UE determines that the relay UE 1 cannot continue to provide a relay service for the remote UE.
- the remote UE may determine the first mode according to the cell selection process of the remote UE and/or the selection process of the remote UE for the new relay UE.
- the embodiment shown in FIG. 5 is not combined with the embodiment shown in FIG. 4, and the embodiment shown in FIG. 6 is not combined with the embodiment shown in FIG.
- the third combination of the embodiment shown in FIG. 5 and the embodiment shown in FIG. 6 is applied.
- the remote UE starts a first timer.
- the first timer may be used to stop when the remote UE selects a suitable cell.
- the remote UE suspends all RBs except the second SRB.
- the RB suspended by the remote UE is the Uu RB.
- the second SRB is, for example, SRB0, or may also be other SRBs. In this embodiment of the present application, the second SRB is SRB0 as an example.
- the remote UE can also release the SL RLC bearer of the suspended RB.
- the remote UE performs cell selection. If the remote UE selects an appropriate cell, then execute S906, and if the remote UE does not select an appropriate cell, execute S907.
- the remote UE selects an appropriate cell.
- the first timer may be stopped, and S508 to S516 in the embodiment shown in FIG. 5 are continued to be performed.
- the remote UE selects or reselects a new relay UE.
- the remote UE does not select a suitable cell, or the cell selected by the remote UE is no longer suitable (for example, the remote UE has originally selected a suitable cell, but the cell becomes no longer suitable), or the remote UE does not receive data from the remote UE.
- the UE initiates the RRC re-establishment message of the network device for RRC re-establishment, or if the RSRP of the cell selected by the remote UE is less than or equal to the second RSRP threshold, S907 can be executed.
- the network device that the remote UE initiates RRC re-establishment is, for example, the second network device.
- the second RSRP threshold is specified by a protocol, for example, or can be configured by a network device or the like.
- the remote UE does not select a suitable cell, when the first timer expires, the remote UE does not select a suitable cell.
- the fact that the remote UE does not receive the RRC re-establishment message from the second network device can be understood as, when the second timer expires, the remote UE does not receive the RRC re-establishment message from the second network device, and the second timer is, for example, remote The UE starts after selecting a suitable cell.
- the remote UE can start the third timer, and the remote UE starts to reselection or selects a new relay UE, and the following can continue to perform in the embodiment shown in FIG. 6 of S606 ⁇ S614.
- the second network device in the embodiment of the present application is a network device in which the remote UE initiates RRC re-establishment through Uu, when performing S606-S614 in the embodiment shown in FIG.
- the second network device is replaced by a third network device, and the third network device and the second network device may be the same network device, or may be different network devices.
- the remote UE can initiate RRC re-establishment through Uu, and if the remote UE fails to initiate RRC re-establishment through Uu, the remote UE can also Select a new relay UE to initiate RRC re-establishment through the new relay UE. In this way, more opportunities for RRC re-establishment can be provided for the remote UE, and the success rate of RRC re-establishment by the remote UE can be improved.
- Embodiments of the present application provide a seventh communication method. Please refer to FIG. 10 , which is a flowchart of the method.
- the remote UE described below may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE 1 described below may be In the relay terminal device in the network architecture shown in FIG. 3A
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG.
- the relay UE 1 described hereinafter It may be a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B
- the relay UE 2 and the second network device described below are not shown in FIG. 3A or FIG. 3B.
- the remote UE communicates with the first network device through the relay UE 1.
- the remote UE determines that the relay UE 1 cannot continue to provide relay services for the remote UE.
- the remote UE may determine the first mode according to the RSRP of the cell selected by the remote UE and/or the RSRP of the new relay UE selected by the remote.
- the embodiment shown in FIG. 5 is not combined with the embodiment shown in FIG. 4, and the embodiment shown in FIG. 6 is not combined with the embodiment shown in FIG.
- the fourth combination of the embodiment shown in FIG. 5 and the embodiment shown in FIG. 6 is applied.
- the remote UE starts a first timer.
- the first timer may be used to stop when the remote selects a suitable cell, or may be used to stop when the remote UE selects a new relay UE.
- the first timer is, for example, timer T311, or other timers. It can be understood that the first timer in the embodiment shown in FIG. 10 can implement the function of the first timer in the embodiment shown in FIG. 5 , or can implement the first timer in the embodiment shown in FIG. 6 . Two timer functions.
- the first timer is started; or, once the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the first timer is started; or, after the remote UE initiates RRC re-establishment Cell selection will be performed, then before cell selection, the remote UE starts the first timer; or, the remote UE starts the first timer before selecting a new relay UE; or, before the remote UE performs cell selection, and in Before selecting a new relay UE, start the first timer.
- the remote UE may also start the first timer in other cases.
- the remote UE suspends all RBs except the second SRB.
- the RB suspended by the remote UE is the Uu RB.
- the second SRB is, for example, SRB0, or may also be other SRBs. In this embodiment of the present application, the second SRB is SRB0 as an example.
- the remote UE can also release the SL RLC bearer of the suspended RB.
- the remote UE selects or reselects a new relay UE; or, the remote UE performs cell selection; or, the remote UE selects or reselects a new relay UE, and performs cell selection.
- the following takes remote UE selection or reselection of a new relay UE and cell selection as an example.
- the remote UE performs RRC re-establishment through the Uu interface, or performs RRC re-establishment through a new relay UE.
- the remote UE can perform RRC re-establishment through the Uu interface.
- the remote UE can perform RRC re-establishment through the Uu interface.
- the remote UE has selected a suitable cell, and the RSRP of the selected cell is greater than the first RSRP threshold, then the remote UE can perform RRC re-establishment through the Uu interface.
- the remote UE can perform RRC re-establishment through the new relay UE.
- the remote UE has selected a new relay UE and a suitable cell, and the difference between the RSRP of the selected cell and the RSRP of the new relay UE is less than or equal to the first RSRP threshold, indicating that the remote UE has passed the new relay.
- the UE performs RRC re-establishment, and the signal quality will be better, then the remote UE can perform RRC re-establishment through the new relay UE.
- the remote UE may perform RRC re-establishment through Uu.
- the remote UE selects a suitable cell and the remote UE cannot be used as a remote terminal device, or the remote UE cannot communicate with the network through other UEs, the remote UE can perform RRC re-establishment through Uu.
- the remote UE can perform RRC re-establishment through the new relay UE.
- the remote UE can perform RRC re-establishment through Uu.
- the first RSRP threshold can be specified by a protocol, for example, or can also be configured by a network device.
- a second RSRP threshold is also mentioned, and the first RSRP threshold and the second RSRP threshold may be equal or unequal.
- the first timer can be stopped. If the remote UE performs RRC re-establishment through Uu, it can continue to perform S508 to S516 in the embodiment shown in FIG. 5 ; or, if the remote UE performs RRC re-establishment through a new relay UE, it can continue to perform the steps shown in FIG. 6 . S608 ⁇ S614 in the embodiment. However, if the remote UE does not select a new relay UE or a suitable cell when the first timer expires, the remote UE enters the RRC idle state, and the process ends.
- the remote UE can choose whether to initiate RRC re-establishment through Uu or through a new relay UE according to the signal quality (for example, RSRP). RRC is re-established. In this way, more opportunities for the remote UE to perform RRC re-establishment can be provided, and the signal quality of the remote UE to perform RRC re-establishment can be improved, thereby improving the success rate of the remote UE to perform RRC re-establishment.
- the signal quality for example, RSRP
- the remote UE can choose whether to initiate RRC re-establishment through Uu or through a new relay UE according to the signal quality (for example, RSRP). RRC is re-established. In this way, more opportunities for the remote UE to perform RRC re-establishment can be provided, and the signal quality of the RRC re-establishment performed by the remote UE can be improved, thereby improving the success rate of the RRC re-establishment performed by the remote UE.
- the signal quality for example, RSRP
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE. There is also a possibility that the relay UE may determine that it cannot continue to provide relay services for the remote UE.
- the relay UE and the remote UE will deal with this scenario.
- FIG. 11 is a flowchart of the method.
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE described hereinafter may be FIG.
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3B
- the relay UE described hereinafter may be is a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B .
- the remote UE communicates with the first network device through the relay UE.
- the relay UE determines that it cannot continue to provide relay services for the remote UE.
- the relay UE can perform RRC re-establishment.
- relay UE can perform cell selection after initiating RRC re-establishment. For example, in the process of cell selection, the relay UE may preferentially select a cell that supports the layer 2 relay technology. For example, the relay UE selects a cell that supports the layer 2 relay technology, and if there is no suitable cell that supports the layer 2 relay technology, the relay UE can select a cell that does not support the layer 2 relay technology.
- RRC re-establishment performed by the relay UE reference may be made to the process of RRC re-establishment performed by the remote UE in the embodiment shown in FIG. 5 .
- the relay UE may also send third indication information to the remote UE, and the third indication information may instruct to perform RRC re-establishment (in this case , the third indication information may also be referred to as RRC re-establishment indication information), or may indicate that the relay UE has occurred RLF (in this case, the third indication information may also be referred to as RLF indication information), where the occurrence of the relay UE is Uu RLF.
- the remote UE After the remote UE receives the third indication information, it can suspend all RBs except the second SRB. Among them, the RB suspended by the remote UE is the Uu RB.
- the second SRB is, for example, SRB0, or may also be other SRBs. In this embodiment of the present application, the second SRB is SRB0 as an example.
- the remote UE may send the response information of the third indication information to the relay UE, or may not send the response information of the third indication information to the relay UE.
- the relay UE when it detects the RLF between the relay UE and the first network device, it may not send the third indication information to the remote UE, but may send the third indication information to the remote UE after the RRC re-establishment is completed. , at this time, the third indication information may indicate to perform RRC re-establishment, or indicate that the relay UE has completed RRC re-establishment, etc. At this time, the third indication information may include the identifier of the serving cell of the relay UE. After the remote UE receives the third indication information, it can determine the shortMAC-I according to the identity of the serving cell. In addition, the remote UE may start the first timer and execute S1103.
- the first timer is, for example, T301, or other timers.
- the first timer may be used for the remote UE to receive the RRC re-establishment message.
- the relay UE sends an RRC re-establishment message to the second network device, and after receiving the RRC re-establishment message, the second network device sends the RRC re-establishment message to the relay UE. After receiving the RRC re-establishment message, the relay UE sends an RRC re-establishment complete message to the second network device.
- the relay UE After the relay UE sends the RRC re-establishment complete message to the second network device, it can be regarded as the relay UE performing RRC re-establishment Complete, the second network device is the network device corresponding to the cell (for example, called the second cell) selected by the relay UE through cell selection during the RRC re-establishment process, and the second network device and the first network device may be the same A network device, or it can be a different network device. The RRC re-establishment process of the relay UE will not be repeated.
- the relay UE can also send the service of the relay UE to the remote UE after the RRC re-establishment is completed.
- the identity of the cell After the remote UE receives the identity of the serving cell of the relay UE, it can determine the shortMAC-I according to the identity of the serving cell. In addition, the remote UE may start the first timer and execute S1103.
- This embodiment of the present application may be applied in combination with the embodiment shown in FIG. 4 , or may also be applied independently. If the embodiment of the present application is applied in combination with the embodiment shown in FIG. 4 , after the relay UE sends the third indication information to the remote UE, the remote UE can determine, according to the third indication information, that the relay UE cannot continue to provide relay for the remote UE service, so that the remote UE can initiate RRC re-establishment according to the first method.
- the first mode may be selected by the remote UE. In the embodiment of the present application, the first mode is the mode in which the original relay UE initiates RRC re-establishment as an example.
- the relay UE may send fourth indication information to the remote UE, and the fourth indication information may indicate that the RRC re-establishment fails (in this case, the fourth indication information may also be referred to as RRC re-establishment failure indication information), or indicates (or , request) to release the connection with the remote UE (for example, a PC5-RRC connection).
- the remote UE can enter the RRC idle state, and the process ends. Or, if the remote UE receives the fourth indication information, it can select or reselect a new relay UE, and then perform RRC re-establishment through the new relay UE. For this process, refer to the embodiment shown in FIG. 6 . Alternatively, if the remote UE receives the fourth indication information, it can initiate RRC re-establishment through Uu, and for this process, refer to the embodiment shown in FIG. 5 .
- the relay UE needs to enter the RRC connection state. Then if the relay UE does not select a suitable cell, or selects a cell that does not support the layer 2 relay technology, the relay UE can initiate RRC re-establishment again; or, if the relay UE has its own relay service in addition to relay services For other services, if the relay UE selects a cell that does not support the layer 2 relay technology, the relay UE can continue to perform RRC re-establishment; or, if the relay UE only has relay services, then if the relay UE does not select a suitable cell , or a cell that does not support the layer 2 relay technology is selected, the relay UE can enter the RRC idle state.
- the remote UE rebuilds the PDCP entity of the first SRB, and establishes or rebuilds the first RLC bearer of the first SRB, and restores SRB1.
- the first RLC bearer of the first SRB is, for example, the SL RLC bearer of the first SRB.
- the first SRB is, for example, SRB1, or other SRBs. In this embodiment of the present application, the first SRB is SRB1 as an example.
- the remote UE can also rebuild the PDCP layer of SRB1, and establish or rebuild the SL RLC bearer of SRB1 to restore SRB1 after sending the RRC re-establishment request message to the relay UE (this message needs to be sent to the second network device).
- the remote UE sends the data of SRB0 to the relay UE, and correspondingly, the relay UE receives the data of SRB0 from the remote UE.
- the data of SRB0 is, for example, an RLC SDU
- the RLC PDU may include an RRC re-establishment request message.
- the remote UE may send the RLC SDU to the relay UE through the SL RLC bearer corresponding to SRB0, and the relay UE receives the RLC SDU.
- the RLC SDU is to be sent to the second network device.
- the second network device is the network device accessed by the relay UE.
- the remote UE sends a message to the second network device and needs to be relayed by the relay UE. Therefore, the remote UE sends the SRB0 data Send to relay UE.
- the relay UE establishes or re-establishes the RLC bearer corresponding to the SRB1 of the remote UE.
- S611 For more content of S1105, reference may be made to S611 in the embodiment shown in FIG. 6, where the relay UE 2 in S611 may be replaced with the relay UE in this embodiment of the present application.
- the relay UE sends the data of the SRB0 from the remote UE to the second network device, and correspondingly, the second network device receives the data of the SRB0 from the relay UE.
- the relay UE may send the data of the SRB0 to the second network device through the Uu RLC bearer of the SRB0.
- S612 For more content of S1106, reference may be made to S612 in the embodiment shown in FIG. 6 , where the relay UE 2 in S612 may be replaced with the relay UE in this embodiment of the present application.
- the second network device sends the data of SRB1 to the remote UE through the relay UE, and correspondingly, the remote UE receives the data of SRB1 from the second network device through the relay UE.
- S613 for more information about S1107, reference may be made to S613 in the embodiment shown in FIG. 6 , wherein the relay UE 2 in S613 can be replaced with the relay UE in this embodiment of the present application, and the third one in S613 can be replaced The timer is replaced with the first timer in this embodiment of the present application.
- the remote UE sends an RRC re-establishment complete message to the second network device through the relay UE, and correspondingly, the second network device receives the RRC re-establishment complete message from the remote UE through the relay UE.
- the relay UE determines that it cannot continue to provide relay services for the remote UE, the relay UE can perform RRC re-establishment, and can trigger the remote UE to also perform RRC re-establishment, and the remote UE can continue to complete the RRC re-establishment by completing the RRC re-establishment.
- the relay UE can perform RRC re-establishment, and can trigger the remote UE to also perform RRC re-establishment, and the remote UE can continue to complete the RRC re-establishment by completing the RRC re-establishment.
- the remote UE accesses the network through the relay UE, and the relay UE 1 is in the RRC connection state, it can reduce the failure of the RRC re-establishment due to the poor signal quality of the cell when the remote UE initiates the RRC re-establishment through the Uu. Service continuity for remote UEs.
- Embodiments of the present application provide a ninth communication method. Please refer to FIG. 12 , which is a flowchart of the method. In this method, it is still determined by the relay UE that it cannot continue to provide relay services for the remote UE. With this method, the efficiency of RRC re-establishment by the remote UE can be improved.
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE described hereinafter may be FIG.
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3B
- the relay UE described hereinafter may be is a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B .
- the remote UE communicates with the first network device through the relay UE.
- the relay UE determines that it cannot continue to provide relay services for the remote UE.
- the relay UE may be determined that it cannot continue to provide the relay service for the remote UE.
- the relay UE starts a first timer.
- the first timer may be used to stop when the relay UE selects a suitable cell.
- the first timer is started; or, once the relay UE determines that it cannot continue to provide relay services for the remote UE, the first timer is started; or, after the relay UE initiates RRC re-establishment, it will start the first timer. If cell selection is performed, the relay UE starts the first timer before performing cell selection. Alternatively, the relay UE may also start the first timer in other cases.
- the first timer is, for example, timer T311, or other timers.
- relay UE suspends all RBs except SRB0.
- the RB suspended by the relay UE is the Uu RB.
- the relay UE can also release the SL RLC bearer of the suspended RB.
- the relay UE performs cell selection. For example, in the process of cell selection, the relay UE may preferentially select a cell that supports the layer 2 relay technology. For example, the relay UE selects a cell that supports the layer 2 relay technology, and if there is no suitable cell that supports the layer 2 relay technology, the relay UE can select a cell that does not support the layer 2 relay technology.
- the relay UE sends the third indication information to the remote UE, and correspondingly, the remote UE receives the third indication information from the relay UE.
- the third indication information may indicate that RRC re-establishment is performed (in this case, the third indication information may also be referred to as RRC re-establishment indication information), or may indicate that RLF occurs to the relay UE (in this case, the third indication information information can also be referred to as RLF indication information), where the relay UE occurs is Uu RLF.
- the Remote UE After the Remote UE receives the third indication information, it can suspend all RBs except the second SRB. Among them, the RB suspended by the remote UE is the Uu RB.
- the second SRB is, for example, SRB0, or may also be other SRBs. In this embodiment of the present application, the second SRB is SRB0 as an example.
- This embodiment of the present application may be applied in combination with the embodiment shown in FIG. 4 , or may also be applied independently. If the embodiment of the present application is applied in combination with the embodiment shown in FIG. 4 , after the relay UE sends the third indication information to the remote UE, the remote UE can determine, according to the third indication information, that the relay UE cannot continue to provide relay for the remote UE service, so that the remote UE can initiate RRC re-establishment according to the first method.
- the first mode may be selected by the remote UE. In the embodiment of the present application, the first mode is the mode in which the original relay UE initiates RRC re-establishment as an example.
- the remote UE sends the response information of the third indication information to the relay UE, and correspondingly, the relay UE receives the response information of the third indication information from the remote UE.
- the remote UE may send the response information of the third indication information to the relay UE, or may not send the response information of the third indication information to the relay UE. That is, S1207 is an optional step.
- relay UE to select an appropriate cell.
- the relay UE selects a cell that supports the layer 2 relay technology.
- the cell selected by the relay UE is called the second cell, for example, the second cell corresponds to the second network device.
- the relay UE sends the identifier of the second cell to the remote UE, and correspondingly, the remote UE receives the identifier of the second cell from the relay UE. If the relay UE selects a suitable cell, the identification of the selected cell can be sent to the remote UE, so that the remote UE can determine the shortMAC-I according to the identification of the cell. Then enter S1211.
- the relay UE When the first timer times out, the relay UE does not select a suitable cell (for example, the relay UE does not select a cell supporting the layer 2 relay technology), then the relay UE sends the fourth indication information to the remote UE, correspondingly, the remote UE The UE receives the fourth indication information from the relay UE.
- a suitable cell for example, the relay UE does not select a cell supporting the layer 2 relay technology
- the fourth indication information may indicate that RRC re-establishment fails (in this case, the fourth indication information may also be referred to as RRC re-establishment failure indication information), or indicate (or request) to release the connection with the remote UE (for example, for PC5-RRC connection).
- the remote UE receives the fourth indication information, it can enter the RRC idle state, and the process ends.
- the remote UE receives the fourth indication information, it can select or reselect a new relay UE, and then perform RRC re-establishment through the new relay UE. For this process, refer to the embodiment shown in FIG. 6 .
- the remote UE receives the fourth indication information it can initiate RRC re-establishment through Uu, and for this process, refer to the embodiment shown in FIG. 5 .
- the relay UE can re-establish RRC, but the RRC re-establishment process is not the process described in S1211; or, if the relay UE has other services of its own in addition to the relay service , then if the relay UE selects a cell that does not support the layer 2 relay technology before the first timer expires, the relay UE can continue to perform RRC re-establishment, but the RRC re-establishment process is not the process introduced in S1211; or, If the relay UE only has relay services, then if the relay UE fails to select a suitable cell when the first timer expires, or selects a cell that does not support the layer 2 relay technology
- S1208-S1209 and S1210 are two parallel schemes, and one of them is executed according to the cell selection situation of the relay UE. In addition, S1211 is not executed after the execution of S1210.
- the relay UE establishes or re-establishes the RLC bearer corresponding to the SRB1 of the remote UE.
- the remote UE determines shortMAC-1 according to the identifier of the second cell.
- the remote UE After the remote UE receives the identity of the serving cell of the relay UE, it can determine the shortMAC-I according to the identity of the serving cell. In addition, the remote UE may perform steps such as S1103 to S1104 and S1106 to S1108 in the embodiment shown in FIG. 11 , which will not be repeated here.
- the relay UE can send the third indication information to the remote UE when initiating RRC re-establishment, so that the remote UE can initiate RRC re-establishment as soon as possible, improving the The efficiency of RRC re-establishment of the remote UE is improved, and the service continuity of the remote UE is correspondingly improved.
- Embodiments of the present application provide a tenth communication method. Please refer to FIG. 13 , which is a flowchart of the method. In this method, it is still determined by the relay UE that it cannot continue to provide relay services for the remote UE. With this method, the efficiency of RRC re-establishment by the remote UE can be improved.
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE described hereinafter may be FIG.
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3B
- the relay UE described hereinafter may be is a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B .
- the remote UE communicates with the first network device through the relay UE.
- the relay UE determines that it cannot continue to provide relay services for the remote UE.
- the relay UE may be determined that it cannot continue to provide the relay service for the remote UE.
- the relay UE starts a first timer.
- the first timer may be used to stop when the relay UE selects a suitable cell.
- the first timer is started; or, once the relay UE determines that it cannot continue to provide relay services for the remote UE, the first timer is started; or, after the relay UE initiates RRC re-establishment, it will start the first timer. If cell selection is performed, the relay UE starts the first timer before performing cell selection. Alternatively, the relay UE may also start the first timer in other cases.
- the first timer is, for example, timer T311, or other timers.
- relay UE suspends all RBs except SRB0.
- the RB suspended by the relay UE is the Uu RB.
- the relay UE can also release the SL RLC bearer of the suspended RB.
- the relay UE performs cell selection.
- the relay UE sends the third indication information to the remote UE, and correspondingly, the remote UE receives the third indication information from the relay UE.
- the third indication information may indicate that RRC re-establishment is performed (in this case, the third indication information may also be referred to as RRC re-establishment indication information), or may indicate that RLF occurs to the relay UE (in this case, the third indication information information can also be referred to as RLF indication information), where the relay UE occurs is Uu RLF.
- the Remote UE After the Remote UE receives the third indication information, it can suspend all RBs except the second SRB. Among them, the RB suspended by the remote UE is the Uu RB.
- the second SRB is, for example, SRB0, or may also be other SRBs. In this embodiment of the present application, the second SRB is SRB0 as an example.
- This embodiment of the present application may be applied in combination with the embodiment shown in FIG. 4 , or may also be applied independently. If the embodiment of the present application is applied in combination with the embodiment shown in FIG. 4 , after the relay UE sends the third indication information to the remote UE, the remote UE can determine, according to the third indication information, that the relay UE cannot continue to provide relay for the remote UE service, so that the remote UE can initiate RRC re-establishment according to the first method.
- the first mode may be selected by the remote UE. In the embodiment of the present application, the first mode is the mode in which the original relay UE initiates RRC re-establishment as an example.
- the remote UE starts a fifth timer.
- the timing duration of the fifth timer can be specified by a protocol, for example, or can also be configured by a network device.
- the remote UE sends the response information of the third indication information to the relay UE, and correspondingly, the relay UE receives the response information of the third indication information from the remote UE.
- the remote UE may send the response information of the third indication information to the relay UE, or may not send the response information of the third indication information to the relay UE. That is, S1308 is an optional step. If S1308 is performed, then S1307 may be performed before S1308, or S1307 may be performed after S1308, or S1307 and S1308 may be performed simultaneously.
- relay UE to select an appropriate cell.
- the relay UE selects a cell that supports the layer 2 relay technology.
- the cell selected by the relay UE is called the second cell, for example, the second cell corresponds to the second network device.
- the relay UE sends the identifier of the second cell to the remote UE, and correspondingly, the remote UE receives the identifier of the second cell from the relay UE. If the relay UE selects a suitable cell, the identification of the selected cell can be sent to the remote UE, so that the remote UE can determine the shortMAC-I according to the identification of the cell. If the remote UE receives the identity of the second cell before the fifth timer expires, it will enter S1312.
- the remote UE does not receive the identification of the cell from the relay UE, and the remote UE enters the RRC idle state.
- the relay UE may not send the identifier of the selected cell to the remote UE.
- the remote UE when the fifth timer expires, if the remote UE has not received the identifier of the serving cell of the relay UE from the relay UE, the remote UE can enter the RRC idle state, or the remote UE can initiate the activation through the Uu interface RRC re-establishment, or the remote UE can also select a new relay to initiate RRC re-establishment, etc.
- S1311 takes the remote UE entering the RRC idle state as an example.
- the relay UE can perform RRC re-establishment again, but the RRC re-establishment process is not the process described in S1312; or, if the relay UE only has relay services, then if the relay UE is in the first timing If a suitable cell is not selected when the timer times out, or a cell that does not support the layer 2 relay technology is selected, the relay UE can enter the RRC idle state.
- S1309-S1310 and S1311 are two parallel solutions, and one of them is executed according to whether the fifth timer times out. In addition, S1311 is not executed after the execution of S1310.
- the relay UE establishes or re-establishes the RLC bearer corresponding to the SRB1 of the remote UE.
- the remote UE stops the fifth timer, and determines shortMAC-1 according to the identifier of the second cell.
- the remote UE After the remote UE receives the identity of the second cell, it can stop the fifth timer and determine the shortMAC-I according to the identity of the serving cell. In addition, the remote UE may perform steps such as S1103 to S1104 and S1106 to S1108 in the embodiment shown in FIG. 11 , which will not be repeated here.
- the relay UE can send the third indication information to the remote UE when initiating RRC re-establishment, so that the remote UE can initiate RRC re-establishment as soon as possible, improving the The efficiency of RRC re-establishment of the remote UE is improved, and the service continuity of the remote UE is correspondingly improved.
- the relay UE does not select a suitable cell, the relay UE does not need to notify the remote UE, and the remote UE can decide the subsequent behavior according to the fifth timer, which reduces the signaling overhead.
- Embodiments of the present application provide an eleventh communication method. Please refer to FIG. 14 , which is a flowchart of the method. In this method, it is still determined by the relay UE that it cannot continue to provide relay services for the remote UE. With this method, the efficiency of RRC re-establishment by the remote UE can be improved.
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE described hereinafter may be FIG.
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3B
- the relay UE described hereinafter may be is a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B .
- the remote UE communicates with the first network device through the relay UE.
- S1401 For more content of S1401, reference may be made to S401 in the embodiment shown in FIG. 4 .
- the relay UE determines that it cannot continue to provide relay services for the remote UE.
- the relay UE may be determined that it cannot continue to provide the relay service for the remote UE.
- the relay UE starts a first timer.
- the first timer may be used to stop when the relay UE selects a suitable cell.
- the first timer is started; or, once the relay UE determines that it cannot continue to provide relay services for the remote UE, the first timer is started; or, after the relay UE initiates RRC re-establishment, it will start the first timer. If cell selection is performed, the relay UE starts the first timer before performing cell selection. Alternatively, the relay UE may also start the first timer in other cases.
- the first timer is, for example, timer T311, or other timers.
- relay UE suspends all RBs except SRB0.
- the RB suspended by the relay UE is the Uu RB.
- the relay UE can also release the SL RLC bearer of the suspended RB.
- the relay UE performs cell selection.
- relay UE to select an appropriate cell.
- the relay UE selects a cell that supports the layer 2 relay technology.
- the cell selected by the relay UE is called the second cell, for example, the second cell corresponds to the second network device.
- the relay UE sends the identifier of the second cell to the remote UE, and correspondingly, the remote UE receives the identifier of the second cell from the relay UE. If the relay UE selects a suitable cell, the identification of the selected cell can be sent to the remote UE, so that the remote UE can determine the shortMAC-I according to the identification of the cell. Then enter S1409.
- the relay UE When the first timer times out, the relay UE does not select a suitable cell (for example, the relay UE does not select a cell supporting the layer 2 relay technology), then the relay UE sends fourth indication information to the remote UE, correspondingly, the remote UE The UE receives the fourth indication information from the relay UE.
- a suitable cell for example, the relay UE does not select a cell supporting the layer 2 relay technology
- the fourth indication information may indicate that RRC re-establishment fails (in this case, the fourth indication information may also be referred to as RRC re-establishment failure indication information), or indicate (or request) to release the connection with the remote UE (for example, for PC5-RRC connection).
- the remote UE receives the fourth indication information, it can enter the RRC idle state, and the process ends.
- the remote UE receives the fourth indication information, it can select or reselect a new relay UE, and then perform RRC re-establishment through the new relay UE. For this process, refer to the embodiment shown in FIG. 6 .
- the remote UE receives the fourth indication information it can initiate RRC re-establishment through Uu, and for this process, refer to the embodiment shown in FIG. 5 .
- the relay UE can re-establish RRC, but the RRC re-establishment process is not the process described in S1409; or, if the relay UE only has relay services, then if the relay UE is in the first timing If a suitable cell is not selected when the timer times out, or a cell that does not support the layer 2 relay technology is selected, the relay UE can enter the RRC idle state.
- S1406-S1407 and S1408 are two parallel schemes, and one of them is implemented according to the cell selection situation of the relay UE. In addition, S1409 is not executed after the execution of S1408.
- the relay UE establishes or re-establishes the RLC bearer corresponding to the SRB1 of the remote UE.
- the remote UE determines shortMAC-1 according to the identifier of the second cell.
- This embodiment of the present application may be applied in combination with the embodiment shown in FIG. 4 , or may also be applied independently. If the embodiment of the present application is applied in combination with the embodiment shown in FIG. 4 , after the relay UE sends the identifier of the second cell to the remote UE, the remote UE can determine that the relay UE cannot continue to provide relay services for the remote UE, so that the remote UE can The UE may initiate RRC re-establishment according to the first manner.
- the first manner may be selected by the remote UE, and in the embodiment of the present application, the first manner is the manner in which the original relay UE initiates RRC re-establishment as an example.
- the remote UE After the remote UE receives the identity of the serving cell of the relay UE, it can determine the shortMAC-I according to the identity of the serving cell. In addition, the remote UE may perform steps such as S1103 to S1104 and S1106 to S1108 in the embodiment shown in FIG. 11 , which will not be repeated here.
- the remote UE may send confirmation information to the relay UE, where the confirmation information is used to confirm the RRC re-establishment through the relay UE.
- the relay UE can initiate RRC re-establishment by itself. If the relay UE selects a suitable cell, the relay UE sends the selected cell to the remote UE by sending the selected The identity of the cell can implicitly indicate that the original RRC connection of the relay UE cannot continue to provide relay services for the remote UE without sending the third indication information to the remote UE, which reduces signaling overhead and enables the remote UE to initiate RRC as soon as possible. Re-establishment improves the efficiency of RRC re-establishment by the remote UE.
- FIG. 15 is a flowchart of the method.
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE described hereinafter may be FIG.
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3B
- the relay UE described hereinafter may be is a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B .
- the relay UE sends the identifier of the second cell to the remote UE, and correspondingly, the remote UE receives the identifier of the second cell from the relay UE.
- the second cell is the cell selected by the relay UE.
- This embodiment of the present application may be combined with any one of the embodiments shown in FIG. 11 to FIG. 14 .
- the relay UE sends the identifier of the second cell to the remote UE, reference may be made to the introduction of the corresponding embodiment. .
- the remote UE determines shortMAC-1 according to the identifier of the second cell.
- the remote UE sends the shortMAC-I to the relay UE, and correspondingly, the relay UE receives the shortMAC-I from the remote UE.
- the relay UE establishes or re-establishes an RLC bearer corresponding to the first SRB of the remote UE.
- the first SRB is, for example, SRB1.
- the relay UE sends an RRC re-establishment request message to the second network device, and correspondingly, the second network device receives the RRC re-establishment request message from the relay UE.
- the RRC re-establishment request message may include the shortMAC-I determined by the relay UE, and the identifier of the relay UE, for example, the identifier of the relay UE is the cell-radio network temporary identifier (C-RNTI) of the relay UE.
- the RRC re-establishment request message may also include the shortMAC-I determined by the remote UE, and the identifier of the remote UE, where the identifier of the remote UE is, for example, the local ID (local ID) or C-RNTI of the remote UE.
- the RRC re-establishment request message may also include other corresponding information, which is not limited in this embodiment of the present application.
- the second network device sends an RRC re-establishment message to the relay UE, and accordingly, the relay UE receives the RRC re-establishment message from the second network device.
- the relay UE may receive the RRC re-establishment message through the Uu RLC bearer corresponding to the remote UE.
- the RRC re-establishment message may indicate that the relay UE is allowed to perform RRC re-establishment, and may also indicate that the remote UE is allowed to perform RRC re-establishment.
- the relay UE may send the RRC re-establishment message to the remote UE, for example, the relay UE may send the RRC re-establishment message to the remote UE, so that the remote UE determines that RRC re-establishment can be performed.
- the relay UE may send the RRC re-establishment message to the remote UE through the SL RLC bearer corresponding to the remote UE.
- the relay UE sends an RRC re-establishment complete message to the second network device, and correspondingly, the second network device receives the RRC re-establishment complete message from the relay UE.
- both the remote UE and the relay UE need to perform RRC re-establishment, so the remote UE does not need to send an RRC re-establishment request message to the second network device, but the relay UE can carry the information of the remote UE in the relay UE The RRC re-establishment request message is sent to the second network device.
- signaling overhead can be reduced, and the remote UE can perform RRC re-establishment, so that the service of the remote UE can be restored, and the packet loss caused by the service interruption can be reduced.
- This embodiment of the present application provides a thirteenth communication method. Please refer to FIG. 16 , which is a flowchart of the method.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the remote UE can enter the RRC idle state to save power consumption.
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE described hereinafter may be FIG.
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3B
- the relay UE described hereinafter may be is a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B .
- the remote UE communicates with the first network device through the relay UE.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE.
- the remote UE enters the RRC idle state.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the remote UE can release the PC5-RRC connection with the relay UE and return to the RRC idle state, which is simple to implement and saves power consumption. After the remote UE returns to the RRC idle state, it can re-establish an RRC connection with the network device, or it can re-select the relay UE to continue the remote UE service.
- This embodiment of the present application provides a fourteenth communication method. Please refer to FIG. 17 , which is a flowchart of the method.
- the remote UE determines that the relay UE cannot continue to provide relay services for the remote UE, the remote UE can enter the RRC idle state to save power consumption.
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3A
- the relay UE described hereinafter may be FIG.
- the first network device described below may be the network device in the network architecture shown in FIG. 3A .
- the remote UE described hereinafter may be a remote terminal device in the network architecture shown in FIG. 3B
- the relay UE described hereinafter may be is a relay terminal device in the network architecture shown in FIG. 3B
- the first network device described below may be a network device in the network architecture shown in FIG. 3B .
- the remote UE communicates with the first network device through the relay UE.
- the relay UE determines that the relay UE cannot continue to provide relay services for the remote UE.
- the relay UE may be determined that it cannot continue to provide the relay service for the remote UE.
- the relay UE initiates RRC re-establishment.
- RRC re-establishment performed by the relay UE, reference may be made to the embodiment shown in FIG. 11 .
- the relay UE does not provide a relay service until an appropriate cell is selected in the RRC re-establishment process, or before the RRC re-establishment is completed.
- the relay UE will perform cell selection during the RRC re-establishment process, so the relay UE does not provide relay services until the relay UE selects a suitable cell. Alternatively, the relay UE does not provide relay services until the RRC re-establishment process of the relay UE is completed. For example, after the relay UE sends an RRC re-establishment complete message to the second network device, it is deemed that the RRC re-establishment process of the relay UE is completed.
- the second network device is a network device corresponding to the cell selected by the relay UE in the RRC re-establishment process.
- relay UE does not provide relay service, which can be implemented in a variety of ways. The following examples are introduced.
- Mode 1 The relay UE does not send the discovery message related to the relay service, or the relay UE refuses to establish a connection with the UE that requests to provide the relay service, or the relay UE does not send the discovery message related to the relay service, and the relay UE Refuse to establish connection with the UE requesting to provide relay service.
- a discovery message may be sent, and the discovery message may include information related to the relay service, for example, it may indicate that the UE sending the discovery message can provide relay service etc. Then, in this embodiment of the present application, the relay UE does not send a discovery message related to the relay service before selecting an appropriate cell or before the RRC re-establishment process is completed.
- the relay UE can refuse to establish a connection with the UE that requests to provide the relay service, and for the UE that does not request to provide the relay service, the relay UE can continue to establish a connection with it; alternatively, the relay UE can also refuse to establish a connection with all the UEs requesting the connection. connect.
- the relay UE sends sixth indication information, and the sixth indication information may indicate that the relay UE is in the RLF state, or indicate that the relay UE is in the process of RRC re-establishment, or indicate that the connection between the relay UE and the first network device is unavailable.
- the relay UE may send sixth indication information to the remote UE, for example, the sixth indication information may be included in the first message, and the first message is, for example, a message for establishing a connection between UEs; alternatively, the relay UE may also broadcast the first message.
- Six indication information for example, the sixth indication information may be included in the first message, and the first message is, for example, a discovery message or a system message, so that more UEs can know the state of the relay UE.
- the UE that receives the sixth indication information (for example, the remote UE) may not select the relay UE to provide the relay service.
- the UE receiving the sixth indication information can also continue to select the relay UE to provide the relay service, for example, it can request the relay UE to provide the relay service after a period of time.
- Mode 3 The remote UE sends seventh indication information, and the seventh indication information may indicate that the connection establishment request message is not sent, or that the PC5 connection establishment process is not to be performed.
- the relay UE may send seventh indication information to the remote UE, for example, the seventh indication information may be included in the second message, and the second message is, for example, a message for establishing a connection between UEs; alternatively, the relay UE may also broadcast the first message.
- Six indication information for example, the seventh indication information may be included in the second message, and the second message is, for example, a discovery message or a system message, so that more UEs can learn the state of the relay UE.
- a UE (such as a remote UE) that receives the sixth indication information may not select the relay UE to provide relay services, or not initiate the PC5-unicast link establishment process with the relay UE, for example, not to the relay UE Send a connection establishment request message (the connection establishment request message is used to request the establishment of a PC5 connection) and so on.
- the UE receiving the sixth indication information can also continue to select the relay UE to provide the relay service, for example, it can request the relay UE to provide the relay service after a period of time.
- Mode 4 The relay UE does not respond to the message for establishing a connection with the relay UE.
- the relay UE does not respond to messages from the remote UE for establishing a connection with the relay UE, or the relay UE does not respond to all messages for establishing a connection with the relay UE.
- the relay UE may not respond to the remote UE first, for example, the relay UE does not send a message to the remote UE.
- the relay UE selects a suitable cell, it can continue to respond to the previously unresponsive messages. For another example, before the RRC re-establishment is completed, if the relay UE receives a connection establishment request message from the remote UE, or if the relay UE and the remote UE are in the process of establishing a PC5 unicast link (that is, the PC5 unicast link is still in the process of establishing a PC5 unicast link). Not established), the relay UE may not respond to the remote UE first, for example, the relay UE does not send a message to the remote UE. After that, if the RRC re-establishment of the relay UE is completed, it can continue to respond to the previously unresponsive messages.
- the relay UE may be specified by the protocol, or configured by the network device, or determined by the relay UE and the remote UE through negotiation in advance, or determined by the relay UE itself.
- the embodiments of the present application may be applied in combination with any one of the embodiments shown in FIG. 4 to FIG. 16 , or may not be combined with any embodiment, but applied alone. Moreover, the technical solutions of the embodiments of the present application can be applied to both the layer 2 relay technology and the layer 3 relay technology.
- the remote UE may not be able to transmit data through the relay UE immediately or be unable to connect to the network device through the relay UE, which may bring service to the remote UE. to a larger delay.
- the technical solutions of the embodiments of the present application can solve this problem, so that the remote UE can select a more suitable UE to provide relay services as soon as possible, thereby reducing the service interruption time of the remote UE.
- FIG. 18 is a schematic structural diagram of a communication apparatus provided by an embodiment of the present application.
- the communication apparatus 1800 may be the first terminal device or the chip system of the first terminal device described in any one of the embodiments shown in FIG. 4 to the embodiments shown in FIG. 17 , and is used to implement the above method.
- the communication apparatus may also be the second terminal device or the chip system of the second terminal device described in any one of the embodiments shown in FIG. 4 to the embodiments shown in FIG. 17 , for implementing the above-mentioned
- the method embodiment corresponds to the method of the second terminal device.
- the communication apparatus may also be the third terminal device or the chip system of the third terminal device described in any one of the embodiments shown in FIG. 4 to the embodiment shown in FIG. 17 , for implementing the above-mentioned
- the method embodiment corresponds to the method of the third terminal device.
- Communication device 1800 includes one or more processors 1801 .
- the processor 1801 may also be referred to as a processing unit, and may implement certain control functions.
- the processor 1801 may be a general-purpose processor or a special-purpose processor, or the like. For example, including: baseband processor, central processing unit, etc.
- the baseband processor may be used to process communication protocols and communication data.
- the central processing unit may be used to control the communication device 1800, execute software programs and/or process data.
- the different processors may be independent devices, or may be provided in one or more processing circuits, eg, integrated on one or more application specific integrated circuits.
- the communication apparatus 1800 includes one or more memories 1802 for storing instructions 1804, and the instructions 1804 can be executed on the processor, so that the communication apparatus 1800 executes the methods described in the above method embodiments.
- the memory 1802 may also store data.
- the processor and the memory can be provided separately or integrated together.
- the communication apparatus 1800 may include instructions 1803 (sometimes also referred to as codes or programs), and the instructions 1803 may be executed on the processor, so that the communication apparatus 1800 executes the methods described in the above embodiments .
- Data may be stored in the processor 1801 .
- the communication device 1800 may further include a transceiver 1805 and an antenna 1806 .
- the transceiver 1805 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, a transceiver, an input/output interface, etc., and is used to implement the transceiver function of the communication device 1800 through the antenna 1806 .
- the communication device 1800 may further include one or more of the following components: a wireless communication module, an audio module, an external memory interface, an internal memory, a universal serial bus (USB) interface, a power management module, an antenna, Speakers, microphones, I/O modules, sensor modules, motors, cameras, or displays, etc. It can be understood that, in some embodiments, the communication device 1800 may include more or less components, or some components may be integrated, or some components may be separated. These components may be implemented in hardware, software, or a combination of software and hardware.
- the processor 1801 and the transceiver 1805 described in the embodiments of the present application may be implemented in an integrated circuit (IC), an analog IC, a radio frequency identification (RFID), a mixed-signal IC, and an application specific integrated circuit (application specific integrated circuit). integrated circuit, ASIC), printed circuit board (printed circuit board, PCB), or electronic equipment, etc.
- IC integrated circuit
- ASIC radio frequency identification
- PCB printed circuit board
- electronic equipment etc.
- it may be an independent device (eg, an independent integrated circuit, a mobile phone, etc.), or may be a part of a larger device (eg, a module that can be embedded in other devices). The description of the terminal device and the network device will not be repeated here.
- the embodiments of the present application provide a terminal device (for convenience of description, referred to as UE), which can be used in the foregoing embodiments.
- the terminal device includes corresponding functions for implementing the functions of the first terminal device or the second terminal device or the third terminal device described in any one of the embodiments shown in FIG. 4 to the embodiments shown in FIG. 17 .
- a terminal device includes a transceiver module, which is used to support the terminal device to implement a transceiver function, and a processing module, which is used to support the terminal device to process signals.
- FIG. 19 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
- the terminal device 1900 may be applicable to the architecture shown in any one of FIG. 1 , FIG. 3A or FIG. 3B .
- FIG. 9 only shows the main components of the terminal device 1900 .
- the terminal device 1900 includes a processor, a memory, a control circuit, an antenna, and an input and output device.
- the processor is mainly used to process communication protocols and communication data, control the entire terminal device 1900, execute software programs, and process data of the software programs.
- the memory is mainly used to store software programs and data.
- the control circuit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal.
- Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
- Input and output devices such as touch screens, display screens, microphones, keyboards, etc., are mainly used to receive data input by users and output data to users.
- FIG. 19 only shows one memory and one processor.
- terminal device 1900 may include multiple processors and memories.
- the memory may also be referred to as a storage medium or a storage device, etc., which is not limited in this embodiment of the present application.
- the antenna and control circuit with transceiving function can be regarded as the transceiving unit 1910 of the terminal device 1900
- the processor having the processing function can be regarded as the processing unit 1920 of the terminal device 1900
- the terminal device 1900 includes a transceiver unit 1910 and a processing unit 1920 .
- the transceiving unit may also be referred to as a transceiver, a transceiver, a transceiving device, or the like.
- the device for implementing the receiving function in the transceiver unit 1910 may be regarded as a receiving unit, and the device for implementing the transmitting function in the transceiver unit 1910 may be regarded as a transmitting unit, that is, the transceiver unit 1910 includes a receiving unit and a transmitting unit.
- the receiving unit may also be referred to as a receiver, a receiver, a receiving circuit, and the like
- the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit, or the like.
- the computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.
- a computer device which may be a personal computer, a server, or a network device, etc.
- the aforementioned computer-readable storage medium can be any available medium that can be accessed by a computer.
- a computer-readable medium may include random access memory (RAM), read-only memory (ROM), or a computer-readable medium capable of carrying or storing instructions or data structures desired program code in the form and any other medium that can be accessed by a computer.
- RAM random access memory
- ROM read-only memory
- a computer-readable medium capable of carrying or storing instructions or data structures desired program code in the form and any other medium that can be accessed by a computer.
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Abstract
Description
Claims (32)
- 一种通信方法,其特征在于,包括:当第一终端设备确定第二终端设备无法继续为所述第一终端设备提供中继服务,所述第一终端设备通过第一方式发起RRC重建立,所述第一方式为通过Uu接口发起RRC重建立的方式,或为通过新的终端设备发起RRC重建立的方式,或为通过所述第二终端设备发起RRC重建立的方式;其中,所述方法还包括:所述第一终端设备通过所述第二终端设备接收来自所述第一网络设备的所述第一信息,所述第一信息用于指示通过Uu发起RRC重建立,或指示通过新的终端设备发起RRC重建立,或指示通过所述第二终端设备发起RRC重建立;或,所述第一信息包括所述第一终端设备选择的小区的RSRP和/或所述第一终端设备选择的第三终端设备的RSRP。
- 根据权利要求1所述的方法,其特征在于,在所述第一信息包括所述第一终端设备选择的小区的RSRP和/或所述第一终端设备选择的第三终端设备的RSRP的情况下,在第一小区的RSRP小于或等于第一RSRP阈值,且所述第一终端设备未选择到能够提供中继服务的终端设备的情况下,所述第一方式为通过Uu接口发起RRC重建立的方式,所述第一小区是所述第一终端设备选择的小区;或,在第一小区的RSRP大于第一RSRP阈值的情况下,所述第一方式为通过Uu接口发起RRC重建立的方式,所述第一小区是所述第一终端设备选择的小区;或,在所述第一终端设备选择的小区的RSRP小于或等于第一RSRP阈值,且所述第一终端设备选择到了能够提供中继服务的第三终端设备的情况下,所述第一方式为通过所述第三终端设备发起RRC重建立的方式;或,在所述第一终端设备选择的小区的RSRP与第三终端设备的RSRP之差小于或等于第一RSRP阈值的情况下,所述第一方式为通过所述第三终端设备发起RRC重建立的方式,所述第三终端设备是所述第一终端设备选择的新的能够提供中继服务的终端设备,或所述第三终端设备与所述第二终端设备是同一个终端设备。
- 根据权利要求1或2所述的方法,其特征在于,所述第一终端设备确定所述第二终端设备无法继续为所述第一终端设备提供中继服务,包括:所述第一终端设备检测到与所述第二终端设备之间的SL RLF;或,所述第一终端设备的第一协议层请求释放所述第一终端设备与所述第二终端设备之间的连接。
- 根据权利要求1~3任一项所述的方法,其特征在于,在所述第一方式为通过Uu接口发起RRC重建立的方式的情况下,所述方法还包括:所述第一终端设备启动第一定时器;其中,所述第一定时器用于当所述第一终端设备选择到小区时停止,或用于当所述第一终端设备选择到新的能够提供中继服务的终端设备时停止;或者,所述第一定时器用于当所述第一终端设备选择到小区时停止,或用于当所述第一终端设备与新的能够提供中继服务的终端设备建立连接完毕时停止;或者,所述第一定时器用于当所述第一终端设备选择到小区时停止,或用于当所述第一终端设备获得所述第一终端设备所选择的新的能够提供中继服务的终端设备的服务小区的标识时停止;所述第一终端设备选择到第一小区,停止所述第一定时器。
- 根据权利要求4所述的方法,其特征在于,所述第一终端设备启动第一定时器,包括:所述第一终端设备在通过所述第一方式发起RRC重建立的情况下,启动所述第一定时器;或,所述第一终端设备确定所述第二终端设备无法继续为所述第一终端设备提供中继服务的情况下,启动所述第一定时器;或,所述第一终端设备在通过所述第一方式发起RRC重建立后,且在进行小区选择之前,启动所述第一定时器。
- 根据权利要求1~3任一项所述的方法,其特征在于,在所述第一方式为通过Uu接口发起RRC重建立的方式的情况下,在所述第一终端设备通过所述第一方式发起RRC重建立之后,所述方法还包括:所述第一终端设备未选择到小区,或,所述第一终端设备所选择的小区不再合适,或,所述第一终端设备未收到来自第二网络设备的RRC重建立消息,或,所述第一终端设备所选择的小区的RSRP小于或等于第二RSRP阈值,所述第二网络设备是所述第一终端设备发起所述RRC重建立的网络设备;所述第一终端设备选择新的能够提供中继服务的终端设备;在所述第一终端设备选择到第三终端设备的情况下,所述第一终端设备通过所述第三终端设备发起RRC重建立,所述第三终端设备能够为所述第一终端设备提供中继服务。
- 根据权利要求6所述的方法,其特征在于,所述第一终端设备未选择到小区,包括:在第一定时器超时时,所述第一终端设备未选择到小区,所述第一定时器是在所述第一终端设备通过所述第一方式发起RRC重建立的情况下启动的,或者所述第一定时器是在所述第一终端设备确定所述第二终端设备无法继续为所述第一终端设备提供中继服务的情况下启动的,或者所述第一定时器是在所述第一终端设备在通过所述第一方式发起RRC重建立后,且在进行小区选择之前启动的。
- 根据权利要求6所述的方法,其特征在于,所述第一终端设备未收到来自第二网络设备的RRC重建立消息,包括:在第二定时器超时时,所述第一终端设备未收到来自所述第二网络设备的RRC重建立消息,所述第二定时器是在所述第一终端设备选择到小区后启动的。
- 根据权利要求1~3任一项所述的方法,其特征在于,在所述第一方式为通过新的终端设备发起RRC重建立的方式的情况下,所述方法还包括:所述第一终端设备在通过所述第一方式发起RRC重建立的情况下,或,所述第一终端设备确定所述第二终端设备无法继续为所述第一终端设备提供中继服务的情况下,或,所述第一终端设备重新选择能够提供中继服务的终端设备之前,所述第一终端设备启动第二定时器;在所述第一终端设备选择到第三终端设备时,或在所述第一终端设备与第三终端设备建立连接完毕时,或在所述第一终端设备获得了第三终端设备的服务小区的标识时,所述第一终端设备停止所述第二定时器。
- 根据权利要求9所述的方法,其特征在于,所述第一终端设备通过所述第一方式发起RRC重建立,包括:所述第一终端设备建立第一SRB的SL RLC承载;所述第一终端设备通过所述第三终端设备将RRC重建立请求消息发送给第二网络设备,所述第二网络设备是所述第三终端设备接入的网络设备;所述第一终端设备通过所述第三终端设备接收来自所述第二网络设备的RRC重建立消息,所述RRC重建立消息在所述第一SRB上传输。
- 根据权利要求1~3任一项所述的方法,其特征在于,在所述第一方式为通过新的终端设备发起RRC重建立的方式的情况下,所述方法还包括:所述第一终端设备启动第一定时器;其中,所述第一定时器用于当所述第一终端设备选择到小区时停止,或用于当所述第一终端设备选择到新的能够提供中继服务的终端设备时停止;或者,所述第一定时器用于当所述第一终端设备选择到小区时停止,或用于当所述第一终端设备与新的能够提供中继服务的终端设备建立连接完毕时停止;或者,所述第一定时器用于当所述第一终端设备选择到小区时停止,或用于当所述第一终端设备获得所述第一终端设备所选择的新的能够提供中继服务的终端设备的服务小区的标识时停止;所述第一终端设备重新选择能够提供中继服务的终端设备,在选择到所述第三终端设备的情况下,所述第一终端设备停止所述第一定时器;或者,所述第一终端设备重新选择能够提供中继服务的终端设备,在选择到所述第三终端设备,且与所述第三终端设备建立了连接的情况下,所述第一终端设备停止所述第一定时器;或者,所述第一终端设备重新选择能够提供中继服务的终端设备,在选择到所述第三终端设备,且获得了所述第三终端设备的服务小区的标识的情况下,所述第一终端设备停止所述第一定时器。
- 根据权利要求11所述的方法,其特征在于,所述第一终端设备启动第一定时器,包括:所述第一终端设备在通过所述第一方式发起RRC重建立的情况下,启动所述第一定时器;或,所述第一终端设备确定所述第二终端设备无法继续为所述第一终端设备提供中继服务的情况下,启动所述第一定时器;或,所述第一终端设备在通过所述第一方式发起RRC重建立后,且在重新选择能够提供中继服务的终端设备之前,启动所述第一定时器。
- 根据权利要求1~3、9~12中任一项所述的方法,其特征在于,在所述第一方式为通过新的终端设备发起RRC重建立的方式的情况下,所述方法还包括:所述第一终端设备向第三终端设备发送第二SRB的数据,所述第二SRB是所述第一终端设备与所述第二网络设备之间的SRB,所述第二网络设备是所述第三终端设备接入的网络设备,所述第三终端设备是所述第一终端设备选择的新的终端设备;所述第三终端设备接收来自所述第一终端设备的所述第二SRB的数据;所述第三终端设备建立或重建对应于所述第一终端设备的第一SRB的RLC承载,所述第一SRB的RLC承载包括所述第一终端设备与所述第三终端设备之间的第一RLC承载和所述第一终端设备与所述第二网络设备之间的第二RLC承载,所述第一SRB是所述第一终端设备与所述第二网络设备之间的SRB;所述第三终端设备向所述第二网络设备发送所述第二SRB的数据;所述第三终端设备通过所述第二RLC承载接收来自所述第二网络设备的所述第一SRB的数据;所述第三终端设备通过所述第一RLC承载将所述第一SRB的数据发送给所述第一终 端设备。
- 根据权利要求13所述的方法,其特征在于,所述第三终端设备建立或重建对应于所述第一终端设备的所述第一SRB的RLC承载,包括:所述第三终端设备接收来自所述第一终端设备的所述第二SRB的数据,所述第三终端设备建立或重建所述第一SRB的RLC承载;或,所述第三终端设备接收来自所述第二网络设备的第一指示信息,所述第三终端设备建立或重建所述第一SRB的RLC承载,其中,所述第一指示信息用于指示建立所述第一SRB的RLC承载,或指示接收所述第二网络设备发送给所述第一终端设备的所述第一SRB的数据,或指示接收所述第二网络设备发送给所述第一终端设备的RRC重建立消息,或指示所述第一终端设备通过所述第三终端设备发送了RRC重建立请求消息;或,所述第三终端设备接收来自所述第一终端设备的第二指示信息,所述第三终端设备建立或重建所述第一SRB的RLC承载,所述第二指示信息用于指示建立所述第一SRB的RLC承载,或指示接收所述第二网络设备发送给所述第一终端设备的所述第一SRB的数据,或指示接收所述第二网络设备发送给所述第一终端设备的RRC重建立消息,或指示所述第一终端设备通过所述第三终端设备发送了RRC重建立请求消息。
- 根据权利要求1~3任一项所述的方法,其特征在于,在所述第一方式为通过所述第二终端设备发起RRC重建立的方式的情况下,所述方法还包括:所述第二终端设备检测到与所述第一网络设备之间的RLF;所述第二终端设备发起RRC重建立。
- 根据权利要求15所述的方法,其特征在于,所述方法还包括:所述第二终端设备向所述第一终端设备发送第三指示信息,所述第三指示信息用于指示进行RRC重建立,或用于指示所述第二终端设备发生RLF。
- 根据权利要求16所述的方法,其特征在于,所述第一终端设备确定所述第二终端设备无法继续为所述第一终端设备提供中继服务,包括:所述第一终端设备根据所述第三指示信息,确定所述第二终端设备无法继续为所述第一终端设备提供中继服务。
- 根据权利要求17所述的方法,其特征在于,所述方法还包括:所述第一终端设备接收所述第三指示信息后,开启第五定时器;在所述第五定时器超时时,如果所述第一终端设备尚未接收到来自所述第二终端设备的第二小区的标识,所述第一终端设备进入RRC空闲态;或者,在所述第五定时器超时前,如果所述第一终端设备接收了来自所述第二终端设备的第二小区的标识,所述第一终端设备关闭所述第五定时器;其中,所述第二小区是所述第二终端设备选择的小区。
- 根据权利要求15~18任一项所述的方法,其特征在于,所述方法还包括:所述第二终端设备在RRC重建立完成后,向所述第一终端设备发送第二小区的标识;或,所述第二终端设备在选择到第二小区时,向所述第一终端设备发送所述第二小区的标识;其中,所述第二小区是所述第二终端设备通过发起RRC重建立而选择的小区。
- 根据权利要求19所述的方法,其特征在于,在所述第二终端设备发起RRC重建立之后,所述方法还包括:所述第二终端设备未选择到小区,所述第二终端设备向所述第一终端设备发送第四指示信息,所述第四指示信息用于指示RRC重建立失败,或指示释放与所述第一终端设备之间的连接;所述第一终端设备接收所述第四指示信息后,进入RRC空闲态,或选择新的终端设备发起RRC重建立,或通过Uu接口发起RRC重建立。
- 根据权利要求16或17所述的方法,其特征在于,所述方法还包括:所述第一终端设备向所述第二终端设备发送第五指示信息,所述第五指示信息用于指示不通过所述第二终端设备进行RRC重建立,或指示释放与所述第二终端设备之间的连接。
- 根据权利要求15所述的方法,其特征在于,所述方法还包括:所述第二终端设备在所述RRC重建立过程中选择到合适的小区前,或在进行RRC重建立完成之前,不提供中继服务。
- 根据权利要求22所述的方法,其特征在于,所述第二终端设备不提供中继服务,包括:所述第二终端设备不发送与中继业务相关的发现消息,或拒绝与请求提供中继服务的终端设备建立连接。
- 根据权利要求22所述的方法,其特征在于,所述第二终端设备不提供中继服务,包括:所述第二终端设备向所述第一终端设备发送第六指示信息,所述第六指示信息用于指示所述第二终端设备处于RLF状态,或指示所述第二终端设备正在进行RRC重建立,或指示所述第二终端设备与所述第一网络设备之间的连接不可用。
- 根据权利要求24所述的方法,其特征在于,所述第六指示信息包括在第一消息中,所述第一消息为发现消息,或为用于终端设备之间建立连接的消息。
- 根据权利要求22所述的方法,其特征在于,所述第二终端设备不提供中继服务,包括:所述第二终端设备向所述第一终端设备发送第七指示信息,所述第七指示信息用于指示不发送连接建立请求消息,或指示不进行PC5连接建立过程。
- 根据权利要求26所述的方法,其特征在于,所述第七指示信息包括在第二消息中,所述第二消息为发现消息,或为用于终端设备之间建立连接的消息。
- 根据权利要求22所述的方法,其特征在于,所述第二终端设备不提供中继服务,包括:所述第二终端设备不响应来自所述第一终端设备的用于与所述第二终端设备建立连接的消息。
- 根据权利要求28所述的方法,其特征在于,所述方法还包括:所述第二终端设备在选择到新的小区后,或进行RRC重建立完成之后,响应来自所述第一终端设备的用于与所述第二终端设备建立连接的消息。
- 一种通信系统,其特征在于,包括第一终端设备和第二终端设备,其中,所述第二终端设备,用于接收来自第一终端设备的第一数据,并将所述第一数据发送给第一网络设备,或者,用于接收来自第一网络设备的第二数据,并将所述第二数据发送给所述第一终端设备,其中,所述第二终端设备为所述第一终端设备提供中继服务;所述第一终端设备,用于确定所述第二终端设备无法继续为所述第一终端设备提供中继服务,并通过第一方式发起RRC重建立,所述第一方式是根据第一信息确定的,所述第一方式为通过Uu接口发起RRC重建立的方式,或为通过新的终端设备发起RRC重建立的方式,或为通过所述第二终端设备发起RRC重建立的方式。
- 一种通信装置,其特征在于,包括收发单元和处理单元,所述收发单元和所述处理单元耦合,能够执行如权利要求1~29中任一项所述的由第一终端设备所执行的方法,或执行如权利要求1~29中任一项所述的由第二终端设备所执行的方法,或执行如权利要求1~29中任一项所述的由第三终端设备所执行的方法。
- 一种计算机可读存储介质,其特征在于,所述计算机可读存储介质用于存储计算机程序,当所述计算机程序在计算机上运行时,使得所述计算机执行如权利要求1~29中任意一项所述的由第一终端设备所执行的方法,或者使得所述计算机执行如权利要求1~29中任意一项所述的由第二终端设备所执行的方法,或者使得所述计算机执行如权利要求1~29中任意一项所述的由第三终端设备所执行的方法。
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