WO2023185956A1

WO2023185956A1 - Sidelink-based communication method and apparatus, and storage medium and chip system

Info

Publication number: WO2023185956A1
Application number: PCT/CN2023/084855
Authority: WO
Inventors: 才宇; 徐海博; 薛丽霞
Original assignee: 华为技术有限公司
Priority date: 2022-03-31
Filing date: 2023-03-29
Publication date: 2023-10-05
Also published as: CN116939507A

Abstract

A sidelink-based communication method and apparatus, and a storage medium and a chip system, which relate to the technical field of wireless communications, and are used for improving the service processing volume of a sidelink. In the present application, a first terminal device sends a first message on a first carrier, and sends a second message on a second carrier. The second carrier is a carrier that is determined by the first terminal device and is different from the first carrier. The first message and the second message are both used for discovering other terminal devices, or the first message and the second message are both used for requesting to establish a link with a second terminal device. Since the sidelink between the first terminal device and the second terminal device is configured with at least two carriers, more services of the sidelink can be processed by means of the at least two carriers, such that the service processing volume of the sidelink can be improved. Moreover, since the first terminal device sends messages on the at least two carriers, the probability of other terminal devices successfully receiving the messages from the first terminal device can be improved.

Description

Sidelink-based communication method, device, storage medium and chip system

Cross-references to related applications

This application requires the priority of a Chinese patent application submitted to the China Patent Office on March 31, 2022, with the application number 202210344832.X and the application name "Sidelink-based communication method, device, storage medium and chip system" , the entire contents of which are incorporated herein by reference.

Technical field

The present application relates to the field of wireless communication technology, and in particular, to a communication method, device, storage medium and chip system based on sidelinks.

Background technique

In a wireless communication system, data communication between terminal devices can be carried out through the network, or communication between terminal devices can be carried out directly without the help of network equipment. For example, two terminal devices can communicate through the PC5 interface. Direct communication. Communication between terminal devices may be called sidelink (SL). Sidelinks support unicast, multicast, and broadcast communications.

In the 3rd Generation Partnership Project (3GPP) long-term evolution (3GPP) version (Release) 16, in the fifth generation mobile network (the 5th generation, 5G) new wireless (New Radio, NR) side link Internet of Vehicles The first version of the NR sidelink was standardized in the (vehicle to everything, V2X) project, which focuses on supporting V2X-related road safety services. In Rel-17, the System Aspects workgroup 2 (SA2) studied and standardized Proximity based service (ProSe), including public safety and business-related services.

In the version (Release) 16NR sidelink, the terminal device is configured with a carrier for the sidelink. All terminal devices that communicate based on the sidelink transmit signaling/data on this carrier, and on this carrier Monitor on the carrier.

Sidelinks can not only be applied to V2X, the industry is increasingly interested in extending sidelinks to other aspects (such as business). As the application scenarios of sidelinks increase, the business volume of sidelinks also increases. How to improve the business processing volume of sidelinks is an urgent problem that needs to be solved.

Contents of the invention

Embodiments of the present application provide a communication method, device, storage medium and chip system based on sidelinks, which are used to configure at least two carriers for terminal equipment that communicates based on sidelinks, and then can process through at least two carriers. More side link services can increase the side link business processing capacity.

In a first aspect, this application provides a communication method based on sidelinks. The method can be executed by a terminal device or a unit, module or chip inside the terminal device. In this application, the first terminal device executes the method provided in the first aspect. The method is introduced as an example. The method includes:

The first terminal device sends the first message on the first carrier and the second message on the second carrier. The second carrier is a carrier determined by the first terminal device that is different from the first carrier. Both the first message and the second message are used to discover other terminal devices, or the first message and the second message are both used to request to establish a link with the second terminal device.

Since at least two carriers are configured for the sidelink between the first terminal device and the second terminal device, through the At least two carriers can handle more sidelink services, thereby increasing the service processing capacity of the sidelink.

On the other hand, in the case where at least two carriers are configured for the sidelink between the first terminal device and the second terminal device, if the first terminal device randomly selects a carrier for sending messages, and other terminal devices (such as The second terminal device) randomly selects a carrier for monitoring, then the probability of other terminal devices successfully receiving the message from the first terminal device is low. For example, the first terminal device randomly selects the first carrier and sends a message on the first carrier; the second terminal device randomly selects the second carrier and monitors the second carrier. In this case, the second terminal device cannot Even if the message sent by the first terminal device is successfully received, a link between the first terminal device and the second terminal device cannot be established.

In this application, the first terminal device can send messages on at least two carriers (for example, sending the first message on the first carrier and the second message on the second carrier). Therefore, it can improve the success of other terminal devices in receiving messages from The probability of the first terminal device receiving the message can then increase the probability of the first terminal device successfully establishing a link with other terminal devices.

The second terminal device of this application may include at least one other terminal device except the first terminal device.

In a possible implementation, the second terminal device includes terminal device one. In this case, both the first message and the second message may be used to request to establish a link with terminal device one. The first message and the second message may both be unicast messages.

In another possible implementation, the second terminal device may include multiple terminal devices, such as terminal device two and terminal device three. The seventh instruction information is used to instruct terminal device two and terminal device three. In this case, both the first message and the second message may be used to request establishing a link with the terminal device indicated by the seventh indication information. In this case, both the first message and the second message may be multicast messages. For example, the first message and the second message may both be broadcast messages.

In a possible implementation, the destination identifier corresponding to the second message is the same as the destination identifier corresponding to the first message.

In this way, when both the first message and the second message are unicast messages, the first message and the second message are both messages sent to the same terminal device. Since the first terminal device sends a message to the same terminal device through at least two carriers, the probability that the terminal device successfully receives the message from the first terminal device can be increased.

In this way, when the first message and the second message are both multicast messages, the first message and the second message have the same destination identifier, which means that the first message and the second message are sent to the same group of terminal devices (at least two terminal devices). news. Since the first terminal device sends the message to the same group of terminal devices through at least two carriers, the probability that the terminal devices in the group of terminal devices successfully receive the message from the first terminal device can be increased.

After the first message in this application is processed, a PDU containing the first message can be obtained. For example, after processing at the PDCP layer, a PDCP PDU containing the first message can be obtained. In a possible implementation, the PDU containing the first message is the same as the PDU containing the second message. It can also be understood that the content corresponding to the first message at the PDCP layer is the same as the content corresponding to the second message at the PDCP layer. Since the first terminal device sends at least two identical PDUs on at least two carriers, the number of receptions received by the receiving end can be increased. The probability of receiving the PDU can thereby increase the probability that the terminal equipment in the group of terminal equipment successfully receives the message from the first terminal equipment.

In a possible implementation, the first terminal device generates a first message, and further generates multiple PDUs containing the first message. The first terminal device sends one copy of the PDU on the first carrier, and sends another copy of the PDU on the second carrier; wherein, the PDU including the second message is the above-mentioned further copy of the PDU. In this way, the first terminal device generates the first message at a higher layer (such as the V2X layer, ProSe layer, PC5 signaling protocol layer, or the upper layer of the AS layer), which can achieve the effect of sending at least two PDUs on at least two carriers, thereby achieving the effect of sending at least two PDUs on at least two carriers. The number of messages generated by the high layer of the first terminal device can be reduced, thereby reducing the workload of the high layer.

In a possible implementation, the message sequence number of the first message is the same as the message sequence number of the second message. In order to introduce the beneficial effects of this solution, let’s give an example:

The first terminal device generates message one and sends message one through carrier one. The first terminal device determines that the message needs to be resent, then regenerates message two and sends message two through carrier one.

It can be seen from the above example that the first terminal device will only send message one once. If resending is required, the higher layer of the first terminal device will regenerate a new message two for resending. That is to say, the second message for retransmission is newly generated, not the original message one, and the original message one only has one copy stored in the buffer area of the first terminal device and has been sent. The first terminal device can only regenerate message two for sending, but cannot send message one twice. In this example, because message two is a newly generated message by the higher layer, the message sequence number of message two is different from the message sequence number of message one.

However, in this application, the message sequence number of the first message is the same as the message sequence number of the second message. That is to say, the first terminal device in this application sends the first message corresponding to the first message on at least two carriers. Multiple copies (for example, multiple PDUs corresponding to the first message may be sent on at least two carriers) to increase the probability that other terminal devices receive the first message.

In a possible implementation, the first terminal device sends the first message on the first carrier, and after the first terminal device sends the second message on the second carrier, the first terminal device sends the first message on the first carrier and the second carrier. Monitor on.

Since the first terminal device has sent messages on at least two carriers, other terminal devices may return response messages on any one or more carriers on the at least two carriers, while the first terminal device sends messages on at least two carriers. Monitoring is performed on the carrier, thereby improving the probability that the first terminal device successfully receives response messages from other terminal devices.

In a possible implementation, the method further includes: the first terminal device monitors on the first carrier after the first carrier sends the first message. If a message responding to the first message is not received on the first carrier within the preset first time period, the first terminal device sends the second message on the second carrier.

In this solution, after the first terminal device sends the first message on the first carrier, if the first terminal device does not receive a message responding to the first message on the first carrier, the first terminal device can determine a message that is different from the first carrier. A carrier, such as a second carrier, then sends the second message via the second carrier. It can be seen that the first terminal device takes turns sending multiple messages on at least two carriers, which on the one hand can increase the probability that other terminal devices receive messages from the first terminal device. On the other hand, since the first terminal device sends the second message on the second carrier without receiving a message in response to the first message on the first carrier, in the case where the first carrier receives a message in response to the first message, The second message may not be sent, so the number of messages sent by the first terminal device may be saved.

In a possible implementation, the first terminal device sends the second message on the second carrier, the first terminal device generates the second message, and the first terminal device combines the destination identifier corresponding to the second message and the destination identifier corresponding to the first message. If the destination identifiers are the same, the second message is sent on the second carrier.

In this application, after the high layer of the first terminal device (such as the V2X layer, ProSe layer, PC5 signaling protocol layer, or the high layer of the AS layer) generates the second message, the high layer of the first terminal device (such as the V2X layer, ProSe layer, Other layers below the PC5 signaling protocol layer (or the upper layer of the AS layer) receive the second message, and when sending the second message, the carrier for sending the second message can be determined based on the destination identifier corresponding to the second message. When the The destination identifier corresponding to the second message is the same as the destination identifier corresponding to the first message, then the first terminal device needs to select the first carrier to send the first message. A different carrier is used to send the second message. In this way, the purpose of the first terminal device sending a message through at least two carriers can be achieved, thereby improving the probability that other terminal devices receive messages from the first terminal device.

In another possible implementation, when the destination identifier corresponding to the message received by other layers of the first terminal device is different from the destination identifier corresponding to the first message, the first terminal device does not need to consider sending when selecting a carrier for the message. The first carrier used in the first message. When selecting the carrier for the message, the first terminal device may select the first carrier or other carriers.

In a possible implementation, after the first terminal device sends the second message on the second carrier, the first terminal device monitors on the second carrier.

Since the first terminal device takes turns to send messages on at least two carriers, it can send messages on one carrier at a time and monitor on one carrier, thereby reducing the requirement on the capability of the first terminal device, that is, the capability is not high. The terminal equipment uses the solution provided by the embodiment of this application.

In a possible implementation, the first message includes indication information of the first service, and the second message includes indication information of the first service. The first carrier and the second carrier support transmission of data of the first service.

In this way, when the first service is configured with at least two carriers, the solution provided by this application can improve the probability that other terminal devices interested in the service receive messages from the first terminal device.

In a possible implementation, after the first terminal device sends the second message on the second carrier, the first terminal device receives the third message from the second terminal device on the second carrier. The first terminal device performs sidelink communication with the second terminal device on the second carrier.

In this way, the first terminal device can determine the second carrier as the carrier for communication with the first terminal device. Subsequently, the first terminal device can send a message to the second terminal device on the second carrier without having to send a message to the second terminal device on the second carrier. Multiple messages are sent to the second terminal device on the carrier, thereby reducing the number of messages sent by the first terminal device.

In the second aspect, this application provides a communication method based on sidelinks. The method can be executed by a terminal device or a unit, module or chip inside the terminal device. In this application, the second terminal device executes the method provided in the second aspect. The method is introduced as an example. The method includes:

The second terminal device receives the first message on the first carrier based on the sidelink, and/or the second terminal device receives the second message on the second carrier based on the sidelink.

Wherein, the second carrier is different from the first carrier. Both the first message and the second message are used to discover other terminal devices, or the first message and the second message are both used to request to establish a link with the second terminal device.

Since at least two carriers are configured for the sidelink between the first terminal device and the second terminal device, more sidelink services can be processed through the at least two carriers, thereby improving the sidelink link. The business processing volume of the road.

The second terminal device of this application can monitor on one carrier or on at least two configured carriers that support sidelinks. When the second terminal device monitors at least two carriers, it is possible to receive messages on at least two carriers (such as the first carrier and the second carrier), and it is also possible to receive multiple messages on at least two carriers. (such as the first message and the second message).

In a possible implementation, when the second terminal receives the first message on the first carrier based on the sidelink, and the second terminal device receives the second message on the second carrier based on the sidelink, The second terminal equipment receives the signal from the first carrier and a carrier among the second carriers for determining the sidelink communication between the second terminal equipment and the first terminal equipment.

In this application, after the second terminal device determines that both the first message and the second message are used to discover other terminal devices, or that the first message and the second message are both used to request to establish a link with the second terminal device, because the second terminal The device can select one carrier from at least two carriers that have received multiple messages as a carrier for subsequent communication with the first terminal device. Therefore, the second terminal device can send messages to the first terminal device on the selected carrier. A response message is returned, while messages received on other unselected carriers can be discarded and not processed. Compared with a possible solution: the second terminal device returns a message in response to the first message on the first carrier, and the second terminal device returns a message in response to the second message on the second carrier. In the solution provided by this application, the second terminal device does not have to respond to the first message and the second message respectively, thereby reducing the number of messages sent by the second terminal device.

In a possible implementation, the second terminal receives the first message on the first carrier based on the sidelink. The second terminal device returns a message responding to the first message to the first terminal device on the first carrier. The second terminal device receives the second message on the second carrier based on the sidelink. The second terminal device determines that both the received second message and the first message are used to discover other terminal devices, or both are used to request and communicate with the third terminal device. After the second terminal device establishes the link, the second message can be discarded, thereby reducing the number of messages that the second terminal device needs to process.

In another possible implementation, the second terminal receives the first message on the first carrier based on the sidelink. The second terminal device returns a message responding to the first message to the first terminal device on the first carrier. After that, the second terminal device receives the second message on the second carrier based on the sidelink. After determining that the PDU corresponding to the second message is the same as the PDU corresponding to the first message, the second terminal device can discard the second message, thereby The number of messages that the second terminal device needs to process can be reduced.

In a possible implementation, the destination identifier corresponding to the second message is the same as the destination identifier corresponding to the first message. The source identifier corresponding to the second message is the same as the source identifier corresponding to the first message. For example, after receiving the first message, the second terminal device can communicate with the first terminal device based on the first carrier, and then continue to receive the second message. After determining the source identifier corresponding to the second message and the source identifier corresponding to the first message, If the source identifiers are the same, the second message can be discarded, thereby reducing the number of messages that the second terminal device needs to process.

In a possible implementation, the second terminal device may monitor the first carrier and the second carrier at the same time, or may monitor the first carrier and the second carrier in turn. For example, the second terminal device monitors the first carrier for a preset second duration and does not receive a message for discovering other terminal devices or for requesting to establish a link with the second terminal device within the preset second duration, then the second terminal device The second terminal device monitors on the second carrier.

It can be seen that if the second terminal device does not have the ability to monitor the first carrier and the second carrier at the same time, it can also adopt a method of monitoring the first carrier and the second carrier in turn. This method can reduce the risk of the second carrier. 2. Capability requirements of terminal equipment.

Further, if the second terminal device receives a message for discovering other terminal devices or requesting to establish a link with the second terminal device, such as the second message, on the second carrier within a preset time period, the second terminal device may no longer Listen on other carriers.

For relevant introduction and beneficial effects, please refer to the relevant introduction in the first aspect and will not be described again.

In a possible implementation, if the second terminal device receives the second message on the second carrier, the second terminal device may send the third message to the first terminal device on the second carrier. The second terminal device may determine the second carrier as a carrier used for sidelink communication with the first terminal device.

In the third aspect, this application provides a communication method based on sidelinks. The method can be executed by a terminal device or a unit, module or chip inside the terminal device. In this application, the first terminal device executes the method provided in the third aspect. The method is introduced as an example. The method includes:

The first terminal device determines the preset carrier, and the first terminal device sends the first message on the preset carrier. The first message is used to discover other terminal devices; or the first message is used to request to establish a link with the second terminal device. The preset carrier is a carrier among at least two carriers configured in the sidelink between the first terminal device and the second terminal device.

Since at least two carriers are configured for the sidelink between the first terminal device and the second terminal device, more sidelink services can be processed through the at least two carriers, thereby improving the performance of the sidelink. Business processing volume.

On the other hand, since this application is provided with a preset carrier, the first terminal device can send the first message on the preset carrier, and other terminal devices may monitor on the preset carrier. Therefore, it can improve the success of other terminal devices in receiving the message from the preset carrier. The probability of the first terminal device receiving the message can then increase the probability of the first terminal device successfully establishing a link with other terminal devices.

In the fourth aspect, this application provides a communication method based on sidelinks. The method can be executed by a terminal device or a unit, module or chip inside the terminal device. In this application, the second terminal device executes the method provided in the fourth aspect. The method is introduced as an example. The method includes:

The second terminal device determines the preset carrier, and the second terminal device monitors the preset carrier. The second terminal device receives the first message from the first terminal device on the preset carrier. Wherein, the first message is used to discover other terminal devices; or the first message is used to request to establish a link with the second terminal device. The preset carrier is a carrier among at least two carriers supported by the sidelink.

On the other hand, since a preset carrier is provided in this application, the second terminal device can monitor on the preset carrier. Other terminal devices may send messages on the preset carrier, so the probability that the second terminal device successfully receives messages from other terminal devices can be increased, and the probability that the second terminal device successfully establishes a link with other terminal devices can be increased.

In the fifth aspect, embodiments of the present application provide a communication method based on sidelinks. The method can be executed by a terminal device or a unit, module or chip inside the terminal device. In this application, the first terminal device is used to execute the fifth aspect. The methods provided are introduced as examples. The method includes:

The first terminal device receives the third message from the second terminal device on the second carrier. The source identifier corresponding to the third message includes the layer 2 identifier of the second terminal device.

The first terminal device determines the first association relationship. The first association relationship indicates that the first destination identifier is associated with the second carrier; or the first association relationship indicates that the first source identifier, the first destination identifier are associated with the second carrier. The first destination identifier includes the layer 2 identifier of the second terminal device, and the first source identifier includes the layer 2 identifier of the first terminal device.

In this way, when the first terminal device subsequently needs to send a message to the second terminal device, it can find the carrier to be used based on the first association relationship.

For example, when the first association relationship indicates that the first destination identifier is associated with the second carrier, the first terminal device includes the second destination identifier corresponding to the fourth message according to the destination identifier corresponding to the fourth message and the first association relationship. In the case of the layer 2 identification of the terminal device, the fourth message is sent on the second carrier.

For another example, in the case where the first association relationship indicates that the first source identifier and the first destination identifier are associated with the second carrier, the first terminal device uses the destination identifier corresponding to the fourth message, the source identifier corresponding to the fourth message and the first The association relationship is that when the destination identifier corresponding to the fourth message includes the layer 2 identifier of the second terminal device, and the source identifier corresponding to the fourth message includes the layer 2 identifier of the first terminal device, the fourth message is sent on the second carrier. .

The fifth aspect of the present application can be used in combination with the foregoing first aspect. For example, before the first terminal device receives the third message from the second terminal device on the second carrier, the first terminal device can execute the foregoing first aspect or the first aspect. Any possible implementation of aspects. For example, before the first terminal device receives the third message from the second terminal device on the second carrier, the first terminal device may send the first message on the first carrier and the second message on the second carrier. The second carrier is a carrier determined by the first terminal device that is different from the first carrier. Both the first message and the second message are used to discover other terminal devices, or the first message and the second message are both used to request to establish a link with the second terminal device.

The fifth aspect of the present application can also be used in conjunction with the aforementioned third aspect. In this case, the second carrier involved in the fifth aspect is a preset carrier. For example, the first terminal device receives a signal from the second carrier on the second carrier. Before sending the third message from the terminal device, the first terminal device may execute the above third aspect or any possible implementation manner of the third aspect. For example, before the first terminal device receives the third message from the second terminal device on the second carrier, the first terminal device determines the preset carrier, and the first terminal device sends the first message on the preset carrier. The first message is used to discover other terminal devices; or the first message is used to request to establish a link with the second terminal device. The preset carrier is a carrier among at least two carriers configured in the sidelink between the first terminal device and the second terminal device.

In the sixth aspect, embodiments of the present application provide a communication method based on sidelinks. The method can be executed by a terminal device or a unit, module or chip inside the terminal device. In this application, a second terminal device is used to perform the sixth aspect. The methods provided are introduced as examples. The method includes:

The second terminal device receives the second message from the first terminal device on the second carrier, and the second terminal device determines the second association relationship.

The second association relationship indicates that the second destination identifier is associated with the second carrier; or the second association relationship indicates that the second source identifier and the second destination identifier are associated with the second carrier. The second destination identifier includes the layer 2 identifier of the first terminal device, and the second source identifier includes the layer 2 identifier of the second terminal device. The second carrier is a carrier determined by the second terminal device for sidelink communication between the second terminal device and the first terminal device.

In this way, when the second terminal device subsequently needs to send a message to the first terminal device, it can find the carrier to be used based on the second association relationship.

For example, when the second association relationship indicates that the second destination identifier is associated with the second carrier, the second terminal device includes the first destination identifier corresponding to the third message according to the destination identifier corresponding to the third message and the second association relationship. In the case of the layer 2 identification of the terminal device, the third message is sent on the second carrier.

For another example, in the case where the second association relationship indicates that the second source identifier, the second destination identifier are associated with the second carrier, According to the destination identifier corresponding to the third message, the source identifier corresponding to the fourth message, and the second association relationship, the second terminal device includes the destination identifier corresponding to the third message including the layer 2 identifier of the first terminal device, and the source identifier corresponding to the third message. If the identifier includes the layer 2 identifier of the second terminal device, the third message is sent on the second carrier.

The sixth aspect of the present application can be used in combination with the foregoing second aspect. For example, before the second terminal device receives the second message from the first terminal device on the second carrier, the second terminal device can execute the foregoing second aspect or the first aspect. Any possible implementation of aspects. For example, before the second terminal device receives the second message from the first terminal device on the second carrier: the second terminal device can monitor on the second carrier; or the second terminal device can also monitor on the first carrier and The second carrier monitors; or the second terminal device may also receive the first message from the first terminal device, and the second terminal device selects the second carrier as the carrier for communication with the first terminal device; or the second terminal device also The first message may not be received from the first terminal device. The second carrier is a carrier determined by the first terminal device that is different from the first carrier. Both the first message and the second message are used to discover other terminal devices, or the first message and the second message are both used to request to establish a link with the second terminal device.

The sixth aspect of the present application can also be used in combination with the aforementioned fourth aspect. In this case, the second carrier involved in the sixth aspect is a preset carrier. For example, the second terminal device receives the signal from the first carrier on the second carrier. Before sending the second message from the terminal device, the second terminal device may execute the above fourth aspect or any possible implementation manner of the fourth aspect. For example, before the second terminal device receives the second message from the first terminal device on the second carrier, the second terminal device determines the preset carrier, and the second terminal device monitors the preset carrier.

In the seventh aspect, embodiments of the present application provide a communication method based on sidelinks. The method can be executed by a terminal device or a unit, module or chip inside the terminal device. In this application, the first terminal device is used to execute the seventh aspect. The methods provided are introduced as examples. The method includes:

The first terminal device acquires first indication information, the first indication information indicates one or more first time periods, and the first terminal device operates on the first carrier and/or the second carrier in the one or more first time periods.

In this way, the working time of the first terminal device is divided into one or more first time periods, and one first time period may include a continuous period of time. There may be a period of time between the two first time periods, that is, the two first time periods are not continuous. The first terminal device works on the first carrier and/or the second carrier during the first time period, and other times can be used to perform other work, thereby improving the flexibility of the working mode of the first terminal device.

In a possible implementation, the first terminal device obtains second indication information, and the second indication information indicates one or more second time periods. The first terminal device performs at least one of the following contents in one or more second time periods: the first terminal device monitors on the third carrier; or; the first terminal device transmits based on the sidelink on the third carrier information. The third carrier is different from the first carrier, or the third carrier is different from the second carrier.

In this way, the working time of the first terminal device is divided into one or more second time periods, and one second time period may include a continuous period of time. There may be a period of time between the two second time periods, that is, the two second time periods are not continuous. The first terminal device works on the third carrier during the second time period, and other times can be used to perform other work, thereby improving the flexibility of the working mode of the first terminal device.

In a possible implementation, any first time period among the one or more first time periods does not overlap with any second time period among the one or more second time periods.

If the first terminal device does not support working on the third carrier and other carriers (such as the first carrier and the second carrier) simultaneously within the same time period, the first terminal device can work on the third carrier through time division multiplexing. and other carriers, thereby reducing the requirements on the capabilities of the first terminal equipment.

In a possible implementation, the first terminal device sends third indication information on the third carrier, and the third indication information is used to instruct the first terminal device to use the third carrier in one or more second time periods based on the sideline. The link transmits the message.

Since other terminal devices send messages to the first terminal device on the third carrier during non-second time periods, the first terminal device cannot receive them. Therefore, after the first terminal device sends the third indication information, it communicates with the first terminal device on the third carrier. The terminal device communicating with the device can also communicate with the first terminal device during the second time period, and do not communicate with the first terminal device on the third carrier during non-second time periods, thereby reducing the resources of other terminal devices. waste.

The seventh aspect of the present application can be used in combination with the foregoing first and/or fifth aspects. For example, the first terminal device can perform the above first, fifth, and first aspects in one or more first time periods. any possible implementation manner, or at least one of any possible implementation manners in the fifth aspect. For example, the first terminal device sends a first message on a first carrier and a second message on a second carrier in one or more first time periods. The second carrier is a carrier determined by the first terminal device that is different from the first carrier. Both the first message and the second message are used to discover other terminal devices, or the first message and the second message are both used to request to establish a link with the second terminal device. For another example, the first terminal device receives the third message from the second terminal device on the second carrier in one or more first time periods, and the first terminal device determines the first association relationship.

The seventh aspect of the present application can also be used in combination with the aforementioned third aspect and/or fifth aspect. In this case, the first carrier or the second carrier involved in the seventh aspect is a preset carrier, for example, the first terminal The device may perform the third aspect, the fifth aspect, any possible implementation manner of the third aspect, or at least one of the possible implementation manners of the fifth aspect in one or more first time periods. One item. For example, the first terminal device sends the first message on the preset carrier in one or more first time periods. The first message is used to discover other terminal devices; or the first message is used to request to establish a link with the second terminal device.

In an eighth aspect, embodiments of the present application provide a communication method based on sidelinks. The method can be executed by a terminal device or a unit, module or chip inside the terminal device. In this application, a second terminal device is used to execute the eighth aspect. The methods provided are introduced as examples. The method includes:

The second terminal device obtains the first indication information, the first indication information indicates one or more first time periods, and the second terminal device operates on the first carrier and/or the second carrier in the one or more first time periods.

In this way, the working time of the first terminal device is divided into one or more first time periods, and one first time period may include a continuous period of time. There may be a period of time between the two first time periods, that is, the two first time periods are not continuous. The second terminal device works on the first carrier and/or the second carrier during the first time period, and other times can be used to perform other work, thereby improving the flexibility of the working mode of the second terminal device.

In a possible implementation, the second terminal device obtains fifth indication information, and the fifth indication information indicates one or more third time periods. The second terminal device performs at least one of the following contents in one or more third time periods: the second terminal device monitors on the fifth carrier; or; the second terminal device transmits based on the sidelink on the fifth carrier. information. The fifth carrier is different from the first carrier, and the fifth carrier is different from the second carrier.

In this way, the working time of the second terminal device is divided into one or more third time periods, and one third time period may include a continuous period of time. There may be a period of time between the two third time periods, that is, the two third time periods are not continuous. The second terminal equipment works on the fifth carrier during the third time period, and other times can be used for other work, thereby improving the flexibility of the working mode of the second terminal equipment.

In a possible implementation, any one of the one or more first time periods does not overlap with any one of the one or more third time periods. A third time period in this application can be the same as a second time period, and a third time period in this application can also be different from any second time period. This is not limited by the embodiment of this application.

If the second terminal device does not support working on the fifth carrier and other carriers (such as the first carrier and the second carrier) simultaneously within the same time period, the second terminal device can work on the fifth carrier through time division multiplexing. and other carriers, thereby reducing the requirements on the capabilities of the second terminal equipment.

In a possible implementation, the second terminal device sends sixth indication information on the fifth carrier, and the sixth indication information is used to instruct the second terminal device to use the fifth carrier in one or more third time periods based on the side row. The link transmits the message.

Since other terminal devices send messages to the second terminal device on the fifth carrier during the non-third time period, the second terminal device cannot receive them. Therefore, after the second terminal device sends the sixth indication information, it communicates with the second terminal device on the fifth carrier. The terminal device communicating with the device can also communicate with the second terminal device during the third time period, and do not communicate with the second terminal device on the fifth carrier during the non-third time period, thereby reducing the resources of other terminal devices. waste.

The eighth aspect of the present application can be used in combination with the aforementioned second aspect and/or sixth aspect. For example, the second terminal device can perform the aforementioned second aspect, sixth aspect, second aspect in one or more first time periods. any possible implementation manner, or at least one of any possible implementation manners in the sixth aspect. For example, the second terminal device may monitor on the second carrier during one or more first time periods; or the second terminal device may also monitor on the first carrier and the second carrier; or The second terminal device may also receive the first message from the first terminal device, and the second terminal device selects the second carrier as the carrier for communication with the first terminal device; or the second terminal device may not receive the first message from the first terminal device. First message received. The second carrier is a carrier determined by the first terminal device that is different from the first carrier. Both the first message and the second message are used to discover other terminal devices, or the first message and the second message are both used to request to establish a link with the second terminal device.

The eighth aspect of the present application can also be used in combination with the aforementioned fourth aspect and/or sixth aspect. In this case, the first carrier or the second carrier involved in the eighth aspect is a preset carrier, for example, the second terminal The device may perform the fourth aspect, the sixth aspect, any possible implementation manner of the fourth aspect, or at least any one possible implementation manner of the sixth aspect in one or more first time periods. One item. For example, before the second terminal device receives the second message from the first terminal device on the second carrier during one or more first time periods, the second terminal device determines the preset carrier, and the second terminal device determines the preset carrier. The terminal device monitors on the preset carrier.

In the ninth aspect, embodiments of the present application provide a communication method based on sidelinks. The method can be executed by a terminal device or a unit, module or chip inside the terminal device. In this application, the first terminal device is used to execute the ninth aspect. The methods provided are introduced as examples. The method includes:

The first terminal device sends a first request message to the fourth terminal device on the fourth carrier, and the first request message requests sidelink-based communication with the fourth terminal device on the second carrier.

In this way, if the first terminal device needs to work on the second carrier, but the first terminal device does not support working on the second carrier and the fourth carrier at the same time, the communication of the fourth terminal device can be migrated to the second carrier. This problem is solved so that the capability requirements for the first terminal device can be reduced.

The ninth aspect of the present application can also be used in combination with the aforementioned third aspect and/or fifth aspect. In this case, the first carrier or the second carrier involved in the seventh aspect is a preset carrier.

The ninth aspect of the present application can also be used in combination with the aforementioned first aspect. For example, the first terminal device can determine the second carrier in a certain manner, and then adopt the solution provided by the ninth aspect.

The ninth aspect of the present application can also be used in combination with the aforementioned seventh aspect. For example, when the fourth terminal device refuses to migrate to the second carrier to work, the first terminal device can adopt the solution provided by the aforementioned seventh aspect. In the first time period, Work on the second carrier, and work on the non-second carrier (for example, the fourth carrier) at other times than the first time period (such as the second time period).

It is worth noting that the solution provided in the ninth aspect can also be executed by the second terminal device side. For example, when the second terminal device determines that it needs to work on the second carrier, it can also migrate communications on other non-second carriers to second carrier, and this solution can also be used in combination with the aforementioned fourth aspect, sixth aspect, second aspect, and eighth aspect. The solution is similar to the above content and will not be described again.

In a tenth aspect, a communication device is provided. The communication device may be the above-mentioned first terminal device or the second terminal device. The communication device may include a communication unit and a processing unit to perform any one of the above-mentioned first to ninth aspects. Any one of these methods. The communication unit is used to perform functions related to sending and receiving. Optionally, the communication unit includes a receiving unit and a sending unit. In one design, the communication device is a communication chip, the processing unit may be one or more processors or processor cores, and the communication unit may be an input/output circuit or port of the communication chip.

In another design, the communication unit may be a transmitter and a receiver, or the communication unit may be a transmitter and a receiver.

Optionally, the communication device further includes various modules that can be used to perform any one of the above-mentioned methods of the first to ninth aspects.

In an eleventh aspect, a communication device is provided. The communication device may be the above-mentioned first terminal device or the second terminal device. The communication device may include a processor and a memory. Optionally, a transceiver is also included, the memory is used to store computer programs or instructions, and the processor is used to call and run the computer program or instructions from the memory. When the processor executes the computer program or instructions in the memory, the The communication device performs any one of the implementation methods of any one of the above-mentioned first to ninth aspects.

Optionally, there are one or more processors and one or more memories.

Optionally, the memory can be integrated with the processor, or the memory can be provided separately from the processor.

Optionally, the transceiver may include a transmitter (transmitter) and a receiver (receiver).

In a twelfth aspect, a communication device is provided. The communication device may be the above-mentioned first terminal device or the second terminal device. The communication device may include a processor. The processor is coupled to a memory and may be used to execute any one of the first to ninth aspects and the method in any possible implementation of the first to ninth aspects. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

In one implementation, when the communication device is a wireless communication device, the communication interface may be a transceiver or an input/output interface. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In another implementation, when the communication device is a chip or a chip system, the communication interface may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip or chip system, etc. . A processor may also be embodied as a processing circuit or logic circuit.

In a thirteenth aspect, a system is provided. The system includes the above-mentioned first terminal device and one or more second terminal devices, and may also include one or more third terminal devices.

In a fourteenth aspect, a computer program product is provided. The computer program product includes: a computer program (which can also be called a code, or an instruction). When the computer program is run, it causes the computer to perform any of the possibilities in the first aspect. The method in the implementation manner, or causing the computer to execute the method in the implementation manner of any one of the above-mentioned first to ninth aspects.

In a fifteenth aspect, a computer-readable storage medium is provided. The computer-readable medium stores a computer program (which may also be called a code, or an instruction) that when run on a computer causes the computer to execute any of the above-mentioned aspects of the first aspect. A method in a possible implementation, or causing a computer to execute the method in any implementation of the above-mentioned first to ninth aspects.

A sixteenth aspect provides a chip system, which may include a processor. The processor is coupled to a memory, and may be used to execute any one of the first to ninth aspects, and any method in any possible implementation manner of any one of the first to ninth aspects. Optionally, the chip system also includes a memory. Memory is used to store computer programs (also called codes, or instructions). The processor is used to call and run the computer program from the memory, so that the device equipped with the chip system executes any one of the first to ninth aspects, and any one of the first to ninth aspects is possible. Methods in the implementation.

In a seventeenth aspect, a communication device is provided. The communication device may be the above-mentioned first terminal device or the second terminal device. The communication device may include: an interface circuit and a processing circuit. Interface circuits may include input circuits and output circuits. The processing circuit is configured to receive signals through the input circuit and transmit signals through the output circuit, so that the method in any one of the first to ninth aspects and any possible implementation manner of the first to ninth aspects is implemented.

In a specific implementation process, the above-mentioned processing device may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, and various logic circuits. The input signal received by the input circuit may be received and input by, for example, but not limited to, the receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by the transmitter, and the input circuit and the output A circuit may be the same circuit that functions as an input circuit and an output circuit at different times. This application does not limit the specific implementation of the processor and various circuits.

In one implementation, when the communication device is a wireless communication device, the wireless communication device may be a terminal such as a smartphone or a wireless access network device such as a base station. The interface circuit may be a radio frequency processing chip in the wireless communication device, and the processing circuit may be a baseband processing chip in the wireless communication device.

In yet another implementation manner, the communication device may be a part of a wireless communication device, such as an integrated circuit product such as a system chip or a communication chip. The interface circuit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip or chip system, etc. The processing circuitry may be logic circuitry on the chip.

Description of drawings

Figure 1a is a possible schematic diagram of a communication system applicable to the embodiment of the present application;

Figure 1b is a schematic diagram of another possible application scenario of the sidelink of the terminal device according to the embodiment of the present application;

Figure 1c is a schematic diagram of another possible application scenario of the sidelink of the terminal device according to the embodiment of the present application;

Figure 2a is a schematic diagram of a possible V2X communication unicast mode layer 2 link establishment process method provided by an embodiment of the present application;

Figure 2b is a schematic flowchart of a possible ProSe direct discovery method provided by an embodiment of the present application;

Figure 2c is a schematic flowchart of a possible ProSe direct discovery method provided by an embodiment of the present application;

Figure 2d is a schematic diagram of a protocol stack of an interface between a terminal device and a terminal device provided by an embodiment of the present application;

Figure 2e is a schematic diagram of a protocol stack for an interface between yet another terminal device provided by an embodiment of the present application;

Figure 3 is a schematic flowchart of a sidelink-based communication method provided by an embodiment of the present application;

Figure 4a is a schematic flow chart of yet another sidelink-based signaling/data transmission method provided by an embodiment of the present application;

Figure 4b is a schematic flowchart of yet another sidelink-based signaling/data transmission method provided by an embodiment of the present application;

Figure 5a is a schematic flowchart of yet another sidelink-based signaling/data transmission method provided by an embodiment of the present application;

Figure 5b is a schematic flow chart of yet another sidelink-based signaling/data transmission method provided by an embodiment of the present application;

Figure 6a is a schematic flow chart of yet another sidelink-based signaling/data transmission method provided by an embodiment of the present application;

Figure 6b is a schematic flow chart of yet another sidelink-based signaling/data transmission method provided by an embodiment of the present application;

Figure 7 is a schematic flowchart of yet another sidelink-based signaling/data transmission method provided by an embodiment of the present application;

Figure 8 is a schematic flow chart of yet another sidelink-based signaling/data transmission method provided by an embodiment of the present application;

Figure 9a is a schematic flowchart of yet another sidelink-based signaling/data transmission method provided by an embodiment of the present application;

Figure 9b is a schematic diagram of a possible time division multiplexing pattern (pattern) for the operation of the first terminal device provided by the embodiment of the present application;

Figure 10a is a schematic flow chart of yet another sidelink-based signaling/data transmission method provided by an embodiment of the present application;

Figure 10b is a possible schematic diagram of a working carrier of a first terminal device provided by an embodiment of the present application;

Figure 11 is a schematic structural diagram of a device provided by an embodiment of the present application;

Figure 12 is a schematic structural diagram of another device provided by an embodiment of the present application;

Figure 13 is a schematic structural diagram of another device provided by an embodiment of the present application.

Detailed ways

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (GPRS), long term evolution, LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), global interconnection microwave access (worldwide interoperability for microwave access, WIMAX) communication systems, fifth generation (5th generation, 5G) systems or new radio (new radio, NR), or applied to future communication systems or other similar communication systems, next-generation wireless LAN systems, etc. .

In addition, the technical solution provided by the embodiment of the present application is applied to sidelink (SL). There are many application scenarios for sidelinks, such as cellular links, links between devices, such as device-to-device (D2D) links, and Internet of Vehicles ( vehicle to everything (V2X) scenario, and can also be applied to Proximity based service (ProSe) scenario.

For example, D2D can be D2D in the long term evolution (long term evolution, LTE) communication system, or it can be D2D in the new wireless (new radio, NR) communication system, or it can also appear with the development of technology. D2D in other communication systems.

Similarly, V2X can be LTE V2X, NR V2X, or V2X in other communication systems that may appear with the development of technology. ProSe can be 4G ProSe, 5G ProSe, or ProSe in other communication systems that may appear with the development of technology.

Illustratively, the V2X scenario can be any one of the following systems: vehicle-to-vehicle communication (V2V), vehicle-to-pedestrian communication (V2P), vehicle-to-network (vehicle to network, V2N) business and vehicle to infrastructure (V2I) communication, etc.

Among them, one participant of V2N is the terminal device, and the other participant is the service entity. V2N is currently the most widely used form of Internet of Vehicles. Its main function is to connect vehicles to cloud servers through mobile networks, thereby providing navigation, entertainment, anti-theft and other functions through cloud servers.

Both participants of V2V are terminal devices. V2V can be used as a reminder for information exchange between vehicles. The most typical application is in the anti-collision safety system between vehicles.

Both participants of V2P are terminal devices. V2P can be used to provide safety warnings to pedestrians or non-motorized vehicles on the road.

One participant in V2I is the terminal device, and the other participant is the infrastructure (or road facility). V2I can be used to communicate between vehicles and infrastructure. For example, the infrastructure can be roads, traffic lights, roadblocks, etc., and road management information such as traffic light signal timing can be obtained.

In this embodiment of the present application, both the sending end and the receiving end in V2X may be D2D devices or V2X devices. For example, the sender and receiver in V2X can both be terminal equipment or terminals.

The sidelink (SL) in the embodiment of this application may also be called a side link, a side link, a direct link, a side link or an auxiliary link, etc. In the embodiment of this application, the above terms all refer to links established between devices of the same type, and have the same meaning. The so-called equipment of the same type may be a link from terminal equipment to terminal equipment, a link from base station to base station, or a link from relay node to relay node, etc. This application The embodiment does not limit this. For the link between the terminal device and the terminal device, there are D2D links defined by 3GPP version (Rel)-12/13, and there are also car-to-car, car-to-mobile phone, or car-to-any entity defined by 3GPP for the Internet of Vehicles. V2X links, including Rel-14/15. It also includes Rel-16 and subsequent versions of V2X links based on NR systems currently being studied by 3GPP.

Figure 1a shows a possible schematic diagram of a communication system applicable to the embodiment of the present application. As shown in Figure 1a, The communication system 100 includes: network equipment and terminal equipment (such as V2X UE1 and V2X UE2).

The terminal equipment in the embodiment of the present application can also be called user equipment (UE), mobile station (MS), mobile terminal (MT), etc., and is a device that provides voice or Data connectivity devices can also be IoT devices. For example, terminal devices include handheld devices with wireless connection functions, vehicle-mounted devices, etc. Terminal devices can be: mobile phones, tablets, laptops, PDAs, mobile Internet devices (MID), wearable devices (such as smart watches, smart bracelets, pedometers, etc.), vehicle-mounted Equipment (such as cars, bicycles, electric vehicles, airplanes, ships, trains, high-speed rail, etc.), virtual reality (VR) equipment, augmented reality (AR) equipment, wireless in industrial control (industrial control) Terminals, smart home equipment (such as refrigerators, TVs, air conditioners, electricity meters, etc.), intelligent robots, workshop equipment, wireless terminals in self-driving, wireless terminals in remote medical surgery, smart grids Wireless terminals in (smart grid), wireless terminals in transportation safety (transportation safety), wireless terminals in smart cities (smart city), or wireless terminals in smart homes (smart home), flying equipment (such as smart robots) , hot air balloons, drones, airplanes), etc. In the embodiments of this application, the devices that implement the above functions are introduced taking the terminal device as an example. It should be understood that the terminal equipment in the embodiment of this application may also refer to a chip in the terminal, a communication device with D2D, V2X or ProSe communication functions, a unit or module, etc., such as a vehicle communication device, a vehicle communication module or a vehicle communication chip. Terminal equipment that supports 5G ProSe requirements and related processes can also be called 5G ProSe terminals (5G ProSe-enabled UE). In Figure 1a, the terminal devices are V2X UE1 and V2X UE2 as examples.

The network device in the embodiment of this application is a device in the network used to connect the terminal device to the wireless network. The network device can be a node in the wireless access network, also called a base station, or a radio access network (RAN) node (or device). The network device may be used to convert received air frames to and from Internet Protocol (IP) packets and act as a router between the end device and the rest of the access network, which may include the IP network. Network devices can also coordinate attribute management of air interfaces. For example, the network equipment may include an evolutionary base station (NodeB or eNB or e-NodeB, evolutionary Node B) in a long term evolution (long term evolution, LTE) system or an evolved LTE system (LTE-Advanced, LTE-A), or It can also include the next generation node B (gNB) in the new radio (NR) system of the fifth generation mobile communication technology (5th generation, 5G), or it can also include the transmission reception point (transmission reception point) , TRP), home base station (for example, home evolved NodeB, or home Node B, HNB), base band unit (base band unit, BBU), or WiFi access point (access point, AP), etc., or it can also include cloud The embodiments of this application are not limited to the centralized unit (CU) and the distributed unit (DU) in the access network (cloud radio access network, CloudRAN) system. For another example, a network device in a V2X technology is a road side unit (RSU). The RSU can be a fixed infrastructure entity that supports V2X applications and can exchange messages with other entities that support V2X applications. In Figure 1a, network equipment is used as a base station as an example for demonstration.

Further, the communication system 100 also includes an application server. The communication system 100 includes two communication interfaces: PC5 interface and Uu interface.

Among them, the PC5 interface refers to the interface between terminal devices. The direct communication between terminal devices is side link communication, which is used for communication between terminal devices. Communication based on the sidelink can use at least one of the following channels: physical sidelink shared channel (PSSCH), used to carry data (data); physical sidelink control channel (physical sidelink control channel (PSCCH), used to carry sidelink control information (SCI), SCI is also called Scheduling assignment (SA). In the embodiment of the present application, when the communication between the terminal equipment and the terminal equipment is in unicast mode, a PC5 unicast link is established between the terminal equipment and the terminal equipment. For example, when a V2X service is carried through a PC5 unicast link, the PC5 unicast link between two terminal devices allows the two terminal devices to conduct V2X communication for one or more pairs of V2X services. The PC5 unicast link between two terminal devices can support one or more V2X service types. PC5 unicast links can also be called layer 2 links on PC5 interfaces.

The Uu interface is a communication interface between a terminal device and a network device. The communication link between the terminal device and the network device includes an uplink (UL) and a downlink (DL). Communication based on the Uu interface can be that the sender terminal device sends data to the network device through the Uu interface. After the network device sends it to the application server for processing, the application server then delivers the processed data to the network device and passes it through The network device sends it to the receiving terminal device.

It should be noted that in the communication mode based on the Uu interface, the network device that forwards the uplink data from the sender terminal device to the application server and the network device that forwards the downlink data from the application server to the recipient terminal device can be the same network. The device can also be a different network device, which can be determined by the application server.

There are many scenarios for sidelink transmission between terminal devices involved in the embodiment of the present application. Figure 1b and Figure 1c respectively illustrate several possible sidelink transmission scenarios of the terminal equipment in the embodiment of the present application. A schematic diagram of the application scenario, as shown in Figure 1b, sidelink transmission between terminal devices can also include transmission between remote terminal equipment (remote UE) and relay terminal equipment (relay UE). The relay terminal equipment (relay UE) can provide the function of supporting the connection between the remote terminal equipment (remote UE) and the data network (Data Network, DN). The remote terminal equipment (remote UE) can communicate with the DN through the relay terminal equipment (relay UE). For example, the remote terminal equipment (remote UE) can communicate through a unicast link established with the relay terminal equipment (relay UE). One-to-one communication.

As shown in Figure 1c, sidelink transmission between terminal devices may also include transmission between the destination terminal device and the relay terminal device, or may also include transmission between the relay terminal device and the source terminal device. The relay terminal equipment (relay UE) can provide the function of supporting the connection between the source terminal equipment and the destination terminal equipment.

In the embodiments of this application, relay terminal equipment (relay UE) may also be called relay equipment, terminal equipment-to-network equipment relay (UE-to-Network Relay), etc., for easy understanding, they are collectively referred to in the embodiments of this application. For relay terminal equipment. The solutions provided by the embodiments of this application can also be applied to 5G ProSe services. In this case, the relay terminal equipment in the embodiments of this application can also be called 5G ProSe terminal equipment-network equipment relay (UE-to-Network Relay) , 5G ProSe relay terminal equipment (relay UE), or 5G ProSe terminal equipment-network equipment relay terminal equipment (UE-to-Network Relay UE), etc., the embodiments of this application are not limited.

In order to more clearly introduce the solutions provided by the embodiments of the present application, the terms and nouns involved in the embodiments of the present application are first explained and introduced below.

(1) Propagation type between terminal devices.

In a wireless communication system, sidelinks between terminal devices can support multiple broadcast types (cast types) such as broadcast communication, unicast communication, and multicast communication.

(1.1)Broadcast communication.

Broadcast communication is similar to the base station broadcasting system information, that is, the terminal device sends broadcast service data to the outside without encryption. Any other terminal device within the effective reception range can receive the broadcast service data if it is interested in the broadcast service.

When a terminal device sends a message using broadcast communication, it sends a source identifier and a destination identifier along with the message. For example, the source identifier may be assigned by the sending device of the message, and the destination identifier may be an identifier corresponding to a preconfigured broadcast service.

(1.2) Unicast communication.

Unicast communication is similar to the data communication after establishing a radio resource control (RRC) connection between the terminal device and the base station. It requires the two terminal devices to establish a unicast connection first (such as establishing a PC5 unicast connection ). After the unicast connection is established, the two terminal devices can communicate data based on the negotiated identification. The data can be encrypted or unencrypted.

When the terminal device uses unicast communication to send a message, it sends a source identifier and a destination identifier along with the message. The source identifier can be assigned by the sending device of the message for the unicast connection, and the destination identifier can be the receiving end of the message. The identifier assigned by the device to this unicast connection.

(1.3)Multicast communication.

At least two terminal devices can form a communication group (also called a multicast group or terminal group). Multicast communication means that the multicast service data sent by any terminal device in the communication group can be used by other terminal devices in the communication group. take over.

When the terminal device uses multicast communication to send a message, it sends a source identifier and a destination identifier along with the message. The destination identifier may be an identifier corresponding to the communication group. Within a communication group, all terminal devices can use the same destination identifier to send and receive data, and different terminal devices can use their own source identifiers to send data.

(2) Several side link-related processes involved in the embodiments of this application.

In the embodiment of this application, two types of processes related to sidelinks are introduced, namely: processes related to communication processes based on sidelinks, and processes related to discovery processes based on sidelinks. Processes related to communication processes based on sidelinks include V2X or ProSe communication unicast mode layer 2 link establishment related processes. Processes related to the sidelink-based discovery process include ProSe discovery processes.

The processes related to the sidelink-based communication process in the embodiment of the present application may include a process for establishing a sidelink-based unicast link between two terminal devices. Since the sidelink link between terminal devices is currently implemented based on the PC5 interface, the unicast link based on the sidelink link established between two terminal devices may also be called a PC5 unicast link in the embodiment of this application. road. In the future, the name of the interface for data transmission between terminal devices based on the sidelink may change, and the name of the unicast link in the embodiment of the present application may also change accordingly.

The ProSe discovery related process in the embodiment of this application can be used to discover other terminal devices.

(2.1) Flow related to communication process based on sidelink.

The following takes the V2X service and the ProSe service as examples to introduce two possible sidelink-based communication process related processes for these two services.

(2.1.1) Process related to the sidelink-based communication process corresponding to the V2X service.

The following uses the V2X communication unicast mode layer 2 link establishment process as an example to introduce the sidelink-based communication process corresponding to the V2X service. The V2X communication unicast mode layer 2 link establishment process can also be called the PC5 reference point. The related process of unicast mode V2X communication, or the unicast link establishment process of V2X service.

Figure 2a is a schematic diagram of a possible V2X communication unicast mode layer 2 link establishment process. Figure 2a is introduced by taking the execution of the first terminal device and the second terminal device as an example, as shown in Figure 2a , the method includes:

Step 201: The first terminal device sends a direct communication request (direct communication request, DCR) message.

The DCR message can be used to initiate the unicast layer 2 link establishment process. DCR messages may include source user information One or more of (Source User information), target business information, security information, and target User information.

The source user information may include the application layer identifier of the first terminal device. When the DCR message is used to initiate the unicast layer 2 link establishment process corresponding to the ProSe service, the destination service information may include the ProSe identifier information requesting the establishment of the layer 2 link (unicast link). When the DCR message is used to initiate the unicast layer 2 link establishment process corresponding to the V2X service, the service information may include information on the V2X service type requesting the establishment of the layer 2 link (unicast link). Security information may include: the information for the establishment of security. The destination user information may include the application layer identification of the destination user. When the DCR message is a unicast message, the destination user information may include the application layer identifier of the second terminal device. When the DCR message is a broadcast message, the DCR message may not include destination user information. In the future, the DCR message may also be transmitted in other transmission methods, such as multicast. When the DCR message is a multicast message, the destination user information may include the application layer identifier of the communication group corresponding to the second terminal device.

When the DCR message is transmitted in the lower layer, the data packet corresponding to the DCR message and/or the control signaling of the data packet may also include a source identifier (identifier, ID) and a destination identifier, and the source identifier and destination identifier are used to send the DCR message. The source identifier used to send the DCR message may include the layer 2 identifier of the first terminal device. The layer 2 identity of the first terminal device may be assigned by the first terminal device itself.

DCR messages can be sent via unicast or broadcast.

When the DCR message is sent in a unicast manner, the DCR message can be sent to other terminal devices alone (such as the second terminal device shown in Figure 2a). The destination identifier used to send the DCR message may be the layer 2 identifier of the second terminal device. The layer 2 identity of the second terminal device may be discovered during PC5 unicast link establishment, or may be known to the first terminal device through previous V2X communication. For example, if a unicast link previously existed, and the application layer identifier of the destination user of the unicast link is the same as the application layer identifier of the second terminal device, the first terminal device can obtain the second terminal device based on the unicast link. Layer 2 identification. For another example, the first terminal device may obtain the layer 2 identifier of the second terminal device from the application layer service announcement from the second terminal device. For another example, the first terminal device may discover the second terminal device through a previous discovery process, and obtain the Layer 2 identifier of the second terminal device through the discovery process.

When a DCR message is sent in a broadcast mode, the destination identifier used to send the DCR message may include a preset layer 2 identifier. For example, the destination identifier used to send the DCR message may include a default destination layer 2 identifier (broadcast layer 2 identifier) associated with the service. For example, the destination identifier used to send the DCR message may be the default destination layer 2 identifier associated with the V2X service type.

In the future, DCR messages may also be sent through other transmission methods, such as multicast. When the DCR message is sent in a multicast manner, the destination identifier used to send the DCR message may include the Layer 2 identifier of the communication group corresponding to the second terminal device.

Step 202: The second terminal device sends a message for establishing security to the first terminal device.

In step 202, the second terminal device may respond to the received DCR message and perform a security establishment process with the first terminal device. During the security establishment process between the second terminal device and the first terminal device, a message for establishing security may be transmitted between the first terminal device and the second terminal device. Figure 2a takes the second terminal device sending a message for establishing security to the first terminal device as an example. In actual applications, other information may exist between the first terminal device and the second terminal device during the security establishment process. The transmission method is not limited in the embodiment of this application.

When the DCR message is a broadcast message, the second terminal device may be one or more terminal devices other than the first terminal device that are interested in the service (for example, V2X service type) announced by the first terminal device. one of. It is worth noting that when the DCR message is multicast, one or more terminal devices can return the message to the first terminal device. The response message is shown in Figure 2a by taking the second terminal device returning a response message to the first terminal device as an example.

For the second terminal device, the source identifier used in the security establishment process may be the Layer 2 identifier of the second terminal device, and the Layer 2 identifier of the second terminal device may be assigned by the second terminal device itself. The destination identifier used in the security establishment process may be the source layer 2 identifier of the DCR message, that is, the layer 2 identifier of the first terminal device. The data packet corresponding to the message for establishing security may include the source identifier and destination identifier used for the security establishment process.

It can be seen that the second terminal device can obtain the layer 2 identification of the first terminal device by receiving the data packet corresponding to the DCR message from the first terminal device. The first terminal device obtains the Layer 2 identifier of the other terminal device (such as the second terminal device) by receiving the data packet corresponding to the message used to establish security from the other terminal device (such as the second terminal device). Through the process shown in Figure 2a, the first terminal device and the second terminal device can exchange layer 2 identifiers with each other, and then can transmit signaling and data in future communications based on the exchanged layer 2 identifiers.

Step 203: The second terminal device sends a direct communication acceptance message to the first terminal device.

The V2X layer of the first terminal device or the PC5 signaling protocol (PC5 signaling protocol) layer, or the upper layer of the access layer (Access Stratum, AS) can allocate the PC5 link identifier and PC5 unicast link for the unicast link. Road related information is passed to the AS layer. PC5 unicast link related information includes layer 2 identification (for example, it may include source end layer 2 identification and destination end layer 2 identification) and corresponding PC5 QoS parameters. In this way, the AS layer of the first terminal device can maintain the PC5 link identifier and PC5 unicast link related information. Similarly, the V2X layer or PC5 signaling protocol layer of the second terminal device, or the upper layer of the access layer can also pass the PC5 link identifier allocated for the unicast link and the PC5 unicast link related information to the AS layer , in this way, the AS layer of the second terminal device can maintain the PC5 link identifier and PC5 unicast link related information.

Step 204: Data corresponding to the service is transmitted between the first terminal device and the second terminal device.

In step 204, the first terminal device and the second terminal device may transmit data corresponding to the service (for example, V2X service) on the established PC5 unicast link.

(2.1.2) Process related to the sidelink-based communication process corresponding to the ProSe service.

In the embodiment of this application, the link establishment process of ProSe direct communication (direct communication) is used as an example to introduce the related processes of the sidelink link-based communication process corresponding to the ProSe service. ProSe direct communication can also be called ProSe direct connection. The link establishment process of ProSe direct communication in the embodiment of the present application can also be called the related process of ProSe direct connection in unicast mode on the PC5 reference point. The PC5 unicast link established based on the link establishment process of ProSe direct communication can be maintained, modified and released according to application layer requests or communication needs.

In a possible implementation, the link establishment process of ProSe direct communication can reuse the unicast link establishment process of the V2X service described in Figure 2a. The differences may include: the V2X services involved in steps 201 and 202. Type can be replaced by ProSe identifier. The V2X service in step 204 can be replaced by a ProSe application or a ProSe service. The V2X layer of the first terminal device and the second terminal device involved in the relevant content of Figure 2a can be replaced by the ProSe layer.

In a possible implementation, the 5G ProSe remote terminal device can also use the above-mentioned link establishment process of ProSe direct communication to initiate a one-to-one communication connection with the selected relay terminal device on PC5. The first terminal device may be a remote terminal device, and the second terminal device may be a relay terminal device selected by the first terminal device. Points of difference can include the following:

The source user information in the DCR message in the above step 201 may include the identification of the remote terminal device requesting the relay operation (such as user information identification (User information ID)). Destination user information may include information found on the relay The identity of the relay terminal device (such as user information ID) provided to the 5G ProSe remote terminal device during the process. The user information identifier (the user information identifier in the source user information, and/or the user information identifier in the destination user information) may be configured for 5G ProSe relay discovery according to the HPLMN policy or through the ProSe application server that allocates the ID. The service information may include a relay service code, and the relay service code may be used to represent the connection service provided by the relay terminal device according to the request of the 5G ProSe remote terminal device.

In step 202, if the identity of the relay terminal device of the second terminal device matches the destination user information (for example, the identity of the relay terminal device of the second terminal device is the same as the destination user information), and the relay service code is the first If the second terminal device includes one of the relay service codes during the relay discovery process, the second terminal device may respond to the DCR message and perform a security establishment process with the first terminal device.

In the case of 5G ProSe layer 2 relay, step 204 does not need to be performed. The unicast link established by the first terminal device and the second terminal device can transmit data between the remote terminal device and the DN.

(2.2) Related processes of discovery process based on sidelinks.

The following takes the ProSe service as an example to introduce two possible processes related to the discovery process based on sidelinks, namely the link establishment process of ProSe direct discovery and the link establishment process of relay discovery.

(2.2.1) ProSe Direct Discovery link establishment process.

The link establishment process of ProSe Direct Discovery has two modes, which are introduced respectively in the following (2.2.1.1) and (2.2.1.2).

(2.2.1.1)Model A.

Mode A (Model A): Utilize discovery protocol messages (notification mode) (corresponding to the content in the 3GPP TR23.713 protocol: In this model the announcing UE broadcasts discovery messages at pre-defined discovery intervals and the monitoring UEs that are interested in these messages read them and process them).

Under this model, terminal devices have two roles:

Publisher (announcing): Used to publish certain information. For example, the terminal device acting as the publisher (announcing) can send discovery messages.

Monitoring: Used to monitor information of interest. For example, a terminal device acting as a monitor can monitor/receive discovery messages.

Figure 2b exemplarily shows a schematic flowchart of a possible ProSe direct discovery method. As shown in Figure 2b, the method includes:

Step 211: The first terminal device sends a discovery message.

Correspondingly, other terminal devices (such as the second terminal device and the third terminal device) receive the discovery message.

The discovery message in the embodiment of this application may also be called a discovery message, an announcement message, etc.

Discovery messages can include message type, etc. In this embodiment of the present application, the message type may include one or more of a discovery type, a content type, and a discovery model.

The source ID and destination ID of the discovery message can be used to send the discovery message. The source identifier may include the Layer 2 identifier of the source end, and the destination identifier may include the Layer 2 identifier of the destination end. The source identifier used to send the discovery message may be a layer 2 identifier selected by the first terminal device for direct ProSe discovery, or a layer 2 identifier selected by the first terminal device for group member discovery. Source layer two identifier. The destination identifier used to send the discovery message may be the Layer 2 identifier of the destination end mapped to the ProSe service (or ProSe service or ProSe identifier), The layer 2 identity of the destination can be used to send/receive initial signaling in ProSe Direct Discovery (such as the discovery message in step 211).

(2.2.1.2)Model B.

Mode B (Model B): Utilizes two discovery protocol messages (request and response mode) (corresponding to the content in the 3GPP TR23.713 protocol: Discoverer UE: The UE transmits a request containing certain information about what it is interested to discover.Discoveree UE: The UE that receives the request message can respond with some information related to the discoverer's request).

Under this model, terminal devices have two roles:

Discoverer: used to send request messages. The request message can include information that the terminal device is interested in discovering. For example, a terminal device as a discoverer can send a request message and then listen for responses from other terminal devices. The response message of the message.

Discoveree: used to listen and receive request messages, and can reply with a response message to the request message after receiving the request message. The response message to the request message can include information related to the content requested by the request message. .

Figure 2c exemplarily shows a schematic flowchart of a possible ProSe direct discovery method. As shown in Figure 2c, the method includes:

Step 221: The first terminal device sends a request message.

Correspondingly, other terminal devices (such as the second terminal device and the third terminal device) receive the request message.

The request message in the embodiment of this application may also be called a discovery message, etc.

The source ID and destination ID of the request message can be used to send the request message. The source identifier may include the Layer 2 identifier of the source end, and the destination identifier may include the Layer 2 identifier of the destination end. Among them, the source identifier used to send the request message may be a layer 2 identifier selected by the first terminal device for direct ProSe discovery, or a layer 2 identifier selected by the first terminal device for group member discovery. Source layer two identifier. The destination identifier used to send the request message can be the Layer 2 identifier of the destination mapped to the ProSe service (or ProSe service or ProSe identifier). The Layer 2 identifier of the destination can be used to send/receive ProSe Direct Discovery (Direct Discovery). Initial signaling in step 221 (such as the request message in step 221).

Step 222: The second terminal device returns a response message of the request message to the first terminal device.

In practical applications, since the request message may be multicast or broadcast, one or more other terminal devices may return a response message to the request message to the first terminal device. In Figure 2c, the second terminal device sends a response message to the first terminal device. The response message returned by the device to the request message is introduced as an example.

The source identifier and destination identifier of the response message of the request message may be used to send the response message of the request message. The source identifier may include the Layer 2 identifier of the source end, and the destination identifier may include the Layer 2 identifier of the destination end. The source identifier of the response message used to send the request message may be a layer 2 identifier selected by the second terminal device for direct ProSe discovery, or a layer 2 identifier selected by the second terminal device for discovery of group members. The source layer two identifier of discovery). The destination identifier of the response message used to send the request message may be the source Layer 2 identifier of the request message in step 211, that is, the Layer 2 identifier of the first terminal device.

(2.2.2) Link establishment process for relay discovery.

The link establishment process of relay discovery can also adopt the two modes shown in Figure 2b and Figure 2c. The relay discovery in the embodiment of the present application may also be called UE-to-Network relay discovery. For ease of understanding, Solution, in the embodiment of this application, relay discovery is taken as an example for introduction.

(2.2.2.1) When the link establishment process of relay discovery uses the mode shown in Figure 2b to establish a link, the differences from the link establishment process of ProSe Direct Discovery may include the following. :

The first terminal device in Figure 2b may be a relay terminal device, and both the second terminal device and the third terminal device may be remote terminal devices.

The discovery message sent by the first terminal device in step 211 may include message type, announcer information, relay service code (RSC), etc. In the embodiment of this application, the announcer information may include providing information about the announcing user (ie, user information ID). The relay service code can be used for 5G ProSe relay discovery to indicate the connection service provided by the relay terminal device to the 5G ProSe remote terminal device.

The source ID and destination ID of the discovery message are used to send the discovery message. The source identifier may include the Layer 2 identifier of the source end, and the destination identifier may include the Layer 2 identifier of the destination end. The source identifier used to send the discovery message may be a Layer 2 identifier selected by the first terminal device itself for relay discovery. The destination identifier used to send the discovery message may be a default preconfigured layer 2 identifier, and the layer 2 identifier may be used to send/receive initial signaling in relay discovery (such as the discovery message in step 211).

Correspondingly, the remote terminal device (such as the second terminal device) can select its corresponding relay terminal device according to the received discovery message.

(2.2.2.2) When the link establishment process of relay discovery uses the mode shown in Figure 2c to establish a link, the differences from the link establishment process of ProSe Direct Discovery may include the following. :

The first terminal device in Figure 2c may be a remote terminal device, and both the second terminal device and the third terminal device may be relay terminal devices.

The request message sent by the first terminal device in step 221 may include message type, discoverer information, RSC, etc.

The source identifier and destination identifier of the request message may be used to send the request message. The source identifier may include the layer 2 identifier of the source end, and the destination identifier may include the layer 2 identifier of the destination end. The source identifier used to send the request message may be a Layer 2 identifier selected by the first terminal device itself for relay discovery. The destination identifier used to send the request message may be a default preconfigured layer 2 identifier, and the layer 2 identifier may be used to send/receive initial signaling in relay discovery (such as the request message in step 221).

For the terminal device that receives the request message in step 221 (such as the second terminal device and the third terminal device), after it is determined that the terminal device matches the RSC value included in the request message, the first terminal device can be sent to the first terminal device by performing step 222. The device returns a response message to the request message. In Figure 2c, a response message in which the second terminal device returns the request message to the first terminal device is taken as an example for illustration.

The response message of the request message sent by the second terminal device in step 222 may include message type, discoverer information, RSC, etc.

The source identifier and destination identifier of the response message of the request message may be used to send the response message of the request message. The source identifier may include the layer 2 identifier of the source end, and the destination identifier may include the layer 2 identifier of the destination end. The source identifier of the response message used to send the request message may be a Layer 2 identifier selected by the second terminal device itself for relay discovery. The destination identifier of the response message used to send the request message may be the layer 2 identifier of the first terminal device that sent the request message in step 211.

(3) The protocol stack of the interface between terminal equipment and terminal equipment.

Figures 2d and 2e respectively illustrate schematic diagrams of protocol stacks for interfaces between two terminal devices. Figure 2d can be a protocol stack corresponding to the 5G discovery plane PC5 interface. As shown in Figure 2d, each protocol layer includes the ProSe discovery protocol (ProSe discovery protocol) layer, the packet data convergence protocol (PDCP) layer, and the radio link control (radio link control, RLC) layer from top to bottom. , media access control (media access control, MAC) layer and physical layer (physical, PHY) layer.

Figure 2e can be the protocol stack corresponding to the 5G PC5 signaling protocol. As shown in Figure 2e, each protocol layer includes the PC5 signaling protocol layer, PDCP layer, RLC layer, MAC layer and PHY layer from top to bottom.

The signaling involved in the embodiment of this application (such as the discovery message, DCR, the target message mentioned later, the first message, the second message, and the third message, etc.) can be the PC5 signaling protocol layer or the ProSe discovery protocol ( The message (PC5-S signaling/discovery message) generated by ProSe discovery protocol) layer is then transmitted through the AS layer. In other protocol stacks, the ProSe discovery protocol layer can also be replaced by the ProSe layer.

The embodiments of this application can also be applied to protocol stacks of interfaces between other terminal devices. In other protocol stacks, the PC5 signaling protocol layer can be replaced by the V2X layer.

(4) Source end layer 2 identification and destination end layer 2 identification.

The embodiments of this application involve multiple messages, such as discovery messages, DCRs, target messages mentioned later, first messages, second messages, and third messages, etc.

The high-level layer of the sending end (such as V2X layer, ProSe layer, PC5 signaling protocol layer, or high-level layer of AS layer) generates a message, such as a discovery message, DCR, target message, first message, second message or third message, etc. , this message is introduced as the first message as an example. After the sender generates the first message at the higher layer, the first message is transmitted to the lower layer (such as the MAC layer, PHY layer, etc.), and is encapsulated at the lower layer to obtain the data packet corresponding to the first message. For example, the PHY layer The data packet corresponding to the first message is encapsulated to obtain the data packet of the PHY layer corresponding to the first message. In the embodiment of this application, the data packet corresponding to the message refers to the data packet containing the message. For example, the data packet corresponding to the first message refers to the data packet containing the first message. During the processing of data packets of the first message in one or more layers below the high-level layer, the source layer 2 identifier and the destination layer 2 identifier will be added to the data packet corresponding to the first message. The source layer 2 identifier and the destination layer 2 identifier are used to send the first message.

For example, after the first terminal device generates the first message at the upper layer, it encapsulates the first message at the MAC layer and adds a part of the source layer 2 identifier (for example, 24 of the first terminal device) to the corresponding data packet at the MAC layer. The upper 16 bits of the layer 2 identifier) and a part of the destination layer 2 identifier (for example, if the first terminal device sends the first message to the second terminal device, and the first message is a unicast message, then the destination layer 2 identifier can be the second The upper 8 bits of the layer 2 identification of the terminal device). After the data packet corresponding to the first message is encapsulated at the MAC layer, a MAC layer data packet is obtained. The MAC layer data packet is transmitted to the PHY layer and processed at the PHY layer. For example, in the control information corresponding to the data packet (the MAC layer data packet corresponding to the first message), another part of the source layer 2 identifier (such as the first message) is added. The lower 8 bits of the layer 2 identifier of one terminal device) and another part of the destination layer 2 identifier (for example, the lower 16 bits of the 24-bit layer 2 identifier of the second terminal device). It can be seen that the source layer 2 identifier and the destination layer 2 identifier are added to the data packets and control information obtained after processing by the MAC layer and PHY layer.

That is to say, in the embodiment of the present application, for a message (such as a discovery message, a DCR, a target message mentioned later, a first message, a second message, or a third message, etc.), the source identifier and destination identifier of the message are For sending the message, the source identifier of the message is the source end (the source end may also be called the sending end), the layer 2 identifier (which may be called the source end in the embodiment of this application). source layer two identifier), the destination identifier of the message is the layer two identifier of the destination end (the destination end may also be called the receiving end) (which may be called the destination layer two identifier in this embodiment), and the source layer two identifier and destination The layer 2 identifier can be added during the process of encapsulating the message by the lower layer. In the embodiment of this application, the first message is taken as an example to introduce the source identifier and destination identifier of the message. The contents of the destination identifiers and source identifiers of other messages are similar and will not be described again.

(5) Signaling radio bearers (SRB).

The sidelink radio bearer is a bearer used to send and receive sidelink data or signaling. Sidelink radio bearers may include packet data convergence protocol (PDCP) entities, radio link control (RLC) entities, or logical channels (logical channels, LCH), etc.

When a terminal device wants to transmit a sidelink radio bearer (RB), the terminal device needs to establish a PDCP entity, an RLC entity and a logical channel. Parameters used to transmit sidelink RB include PDCP configuration, RLC configuration, and MAC configuration. On the sidelink, there are two types of radio bearers, one is the sidelink data radio bearers (DRB), and the other is the sidelink signaling radio bearers (SL) signaling radio bearers (SL). SRB), SL The control plane data transmitted by SRB includes RRC messages and PC5-S messages on the PC5 interface. SL SRB can have many types, such as SL SRB0, SL SRB1, SL SRB2, SL SRB3 and SL SRB4.

In a possible implementation, the corresponding message types that can be transmitted can be set for the SL SRB.

For example, SL SRB0 can be used to transmit initial signaling in processes related to sidelink-based communication processes. For example, it can be used to transmit direct communication request messages in the link establishment process of V2X communications. For example, it can be used to transmit Transmits the direct communication request message in the link establishment process of ProSe direct communication. For example, SL SRB0 is used to transmit unprotected PC5-S messages.

For another example, SL SRB1, SL SRB2, and SL SRB3 can be used to transmit other signaling in addition to initial signaling in the communication process-related processes based on sidelinks, such as links that can be used to transmit V2X communications. The message used to establish security in the establishment process is another example of the message used to establish security in the link establishment process that can be used to transmit ProSe direct communication. For example, SL SRB1 can be used to transmit PC5-S messages that establish PC5-S security (such as the Direct Link Security Mode Command message and the Direct Link Security Mode Complete message). SL SRB2 can be used to transmit protected PC5-S messages in addition to direct link security mode completion. SL SRB3 is used to transmit PC5-RRC messages.

As another example, SL SRB4 can be used to transmit discovery messages in processes related to the discovery process based on sidelinks. For example, it can be used to transmit discovery messages or request messages in the link establishment process directly discovered by ProSe. Another example can be Used to transmit discovery messages or request messages in the link establishment process of relay discovery.

In this embodiment of the present application, in order to increase the number of services processed by the side link, the side link between the first terminal device and the second terminal device may be configured with at least two carriers. On the other hand, in the case where the sidelink between the first terminal device and the second terminal device is configured with at least two carriers, if the first terminal device and the second terminal device both randomly select one carrier as the working carrier, then A carrier selected by the first terminal device for sending messages and a carrier selected by the second terminal device for monitoring may be largely different. This will result in a high probability that the second terminal device will not receive the message from the third terminal device. A message from an end device. The solution provided by the embodiment of the present application can also improve the probability that the second terminal device receives the message sent by the first terminal device when at least two carriers are configured for the sidelink.

In a possible implementation, the first terminal device sends the target message on each of the N1 carriers based on the sidelink, and the second terminal device monitors the N2 carriers. The N1 carriers and N2 carriers both belong to the carriers configured for the sidelink. N1 is a positive integer. N2 is a positive integer. In the embodiment of this application, N1 may be equal to 1 or An integer greater than 1. N2 can be an integer equal to 1 or greater than 1. In another possible implementation, N1 may be related to N2. For example, when N1 is equal to 1, N2 needs to be an integer greater than 1; for another example, when N1 is greater than 1, N2 may be 1 or an integer greater than 1.

In a possible implementation, N1 is an integer greater than 1. That is to say, when at least two carriers are configured for the sidelink between the first terminal device and the second terminal device, the first terminal device can send the target message on at least two of the carriers. The second terminal device may monitor one or more carriers among the at least two carriers, which is not limited in the embodiment of this application. Since the first terminal device sends the target message on at least two carriers, compared with the solution in which the first terminal device only sends the target message on one carrier, the solution provided by the embodiment of the present application can improve the reception of the target message by the second terminal device. The probability. It is worth noting that the at least two target messages are both used to discover other terminal devices; or the at least two target messages are both used to request to establish a link with the second terminal device.

In another possible implementation, N2 is an integer greater than 1. That is to say, in this embodiment of the present application, when at least two carriers are configured for the sidelink between the first terminal device and the second terminal device, the second terminal device monitors on at least two of the carriers. . The first terminal device may send the target message on one or more of the at least two carriers, which is not limited in the embodiment of this application. Since the second terminal device monitors on at least two carriers, compared with the solution in which the second terminal device monitors only one carrier, the solution provided by the embodiment of the present application can increase the probability that the second terminal device receives the target message.

In yet another possible implementation provided by the embodiments of this application, the first terminal device sends the target message on a preset carrier, and the second terminal device monitors on the preset carrier. The sidelink between the first terminal device and the second terminal device is configured with at least two carriers, and the preset carrier is a carrier among the at least two carriers. Since the working carriers of the first terminal device and the second terminal device both include preset carriers, the solution provided by the embodiment of the present application can increase the probability that the second terminal device receives the target message.

The solutions provided by the embodiments of the present application will be further introduced below based on the above content.

According to the content shown in Figure 1a, Figure 1b, Figure 1c, Figure 2a, Figure 2b, Figure 2c, Figure 2d and Figure 2e, Figure 3 exemplarily shows a sidelink-based method provided by an embodiment of the present application. communication method. The sidelink-based communication method provided by the embodiment of the present application can be used to transmit signaling/data. The method provided in Figure 3 can be applied to the aforementioned sidelink communication process (such as Figure 2a), and can also be applied to the aforementioned sidelink discovery process (such as Figure 2b or Figure 2c). In Figure 3, the method is introduced by taking the method executed by the first terminal device and the second terminal device as an example. In the embodiment of the present application, the solution executed by the first terminal device side can also be executed by the unit, module or chip inside the first terminal device, and the solution executed by the second terminal device side can also be executed by the unit, module or chip inside the second terminal device. chip execution.

In this embodiment of the present application, the first terminal device and the second terminal device may be located within the coverage area of the same cell, or may be located within the coverage area of two cells respectively. One of the first terminal device and the second terminal device may also be located outside the coverage of the network device. The first terminal device and the second terminal device may both be located outside the coverage of the network device.

The first terminal device and the second terminal device in Figure 3 may be the two terminal devices in Figure 1a. For example, the first terminal device and the second terminal device may be V2X UE1 and V2X UE2 respectively, where the first terminal device may for either of the two terminal devices. The first terminal device and the second terminal device in Figure 3 can also be ProSe UE1 and ProSe UE2 respectively, where the first terminal device can be any one of ProSe UE1 and ProSe UE2.

The first terminal device and the second terminal device in Figure 3 may be the two terminal devices in Figure 1b. For example, the first terminal device and the second terminal device may be a relay terminal device and a remote terminal device respectively, wherein the first terminal device and the second terminal device may be a relay terminal device and a remote terminal device respectively. A terminal device can be any one of the two terminal devices.

The first terminal device and the second terminal device in Figure 3 may be the two terminal devices in Figure 1c. For example, the first terminal device and the second terminal device may be the source terminal device and the relay terminal device respectively, where the first terminal device and the second terminal device may be the source terminal device and the relay terminal device respectively. A terminal device can be any one of two terminal devices. For another example, the first terminal device and the second terminal device may be the relay terminal device and the destination terminal device respectively, wherein the first terminal device may be any one of the two terminal devices.

As shown in Figure 3, the method includes:

Step 301: The first terminal device sends the target message on N1 carriers based on the sidelink.

It is worth noting that when N1 is greater than 1, the first terminal device needs to send the target message on N1 carriers, where the first terminal device sends at least one target message on each of the N1 carriers. The target messages are used to discover other terminal devices; or the target messages are used to request to establish a link with the second terminal device. When the first terminal device sends multiple target messages on multiple carriers, in this embodiment of the present application, the target message includes a first message and a second message as an example.

In the embodiment of this application, the set of N1 carriers used by the first terminal device to send the target message is called the first carrier set. The first carrier set may include one or more carriers. N1 can be a positive integer.

The first terminal device sends at least one target message on each carrier of the first set of carriers. The target message is used to discover other terminal devices or request to establish PC5 unicast links with other terminal devices. Since the side links between terminal devices are currently on the PC5 interface, the unicast link established between the terminal devices is called a PC5 unicast link in the embodiment of this application. In the future, if the side links between terminal devices If the interface name used by the line link changes, the name of the PD5 unicast link in the embodiment of this application may also change accordingly. For a clearer introduction, the embodiment of this application takes the PC5 unicast link as an example. introduce.

In the embodiment of the present application, the target message may be a message in a process related to a sidelink-based communication process. For example, it may be an initial message for the first terminal device to establish a PC5 unicast link; the target message may also be a sidelink-based message. Messages in processes related to the link's discovery process.

For example, the PC5 unicast link that the first terminal device needs to establish is the Layer 2 link in the V2X communication unicast mode on the PC5 reference point. The target message can be the initial message in the link establishment process of V2X communication. For example, it can be as shown in Figure Direct communication request message in 2a.

For another example, the PC5 unicast link that the first terminal device needs to establish is the Layer 2 link in the ProSe communication unicast mode on the PC5 reference point. The target message can be the initial signaling in the link establishment process of ProSe direct communication, such as Messages can be requested for direct communication.

As another example, target messages are used to discover other terminal devices. The target message may be initial signaling in the discovery process. For example, the target message is the initial signaling in the link establishment process directly discovered by ProSe. For example, the target message can be the discovery message in step 211 in Figure 2b. Another example, the target message can be the request message in step 221 in Figure 2c. The carriers in the first carrier set may be all or part of the corresponding carriers directly discovered by ProSe.

For another example, the target message is the initial signaling in the link establishment process discovered by the relay. For example, the target message can be a discovery message or a request message. The carriers in the first carrier set may be all or part of the carriers corresponding to the relay discovery.

Step 302: The first terminal device monitors N1 carriers used to send target messages.

In this embodiment of the present application, step 302 may be an optional step. For example, when the target message is the discovery message in Figure 2b, the first terminal device may not perform step 302.

Step 303: The second terminal device monitors on one of the N2 carriers.

Optionally, step 303 can be performed simultaneously with step 301, or before or after step 301. When step 303 is performed before step 301, it helps the second terminal device to receive the target message from the first terminal device in a timely manner.

In this embodiment of the present application, the set of N2 carriers monitored by the second terminal device may be called the second carrier set. The second carrier set may include one or more carriers.

Step 304: The second terminal device receives at least one target message on a carrier among the N2 carriers.

On the other hand, since the first terminal device sends the target message on at least two carriers (N1 may be greater than 1), and/or the second terminal device monitors on at least two carriers (N2 may be greater than 1), the first terminal device The probability of intersection between the carrier used by the terminal device to send messages and the carrier used by the second terminal device for monitoring is increased, which in turn increases the probability that the second terminal device receives the target message. For example, when N1 carriers and N2 carriers are exactly the same, the probability of the second terminal device receiving the target message will be further improved.

In another possible implementation, in the above step 301, N1 carriers may support the transmission of the first service. The N1 carriers may include all or part of all carriers configured for the first service. The first service may include one or more services. For example, the first service may include at least one of a V2X service or a ProSe service. The target message may include identification information of the first service. In this way, the target message can be used to discover other terminal devices that are interested in the first service. Alternatively, the target message may be used to request the establishment of a PC5 unicast connection with other terminal devices that are interested in the first service.

For example, the carriers in the first carrier set may be all or part of the carriers corresponding to ProSe Direct Discovery. In this case, the first terminal device may be used to send a discovery message in the ProSe Direct Discovery process. For another example, the carriers in the first carrier set may be all or part of the carriers corresponding to relay discovery. In this case, the first terminal device may be used to send a discovery message in the relay discovery process.

In another possible implementation, N2 carriers can support the first service. The N2 carriers may include all or part of all carriers configured for the first service. And because the N1 carriers may include all or part of all carriers configured for the first service. In this way, the probability that N1 carriers and N2 carriers intersect can be improved, and then the probability that the second terminal device receives the target message can be improved. For example, when N1 carriers and N2 carriers are exactly the same (or the first carrier set and the second carrier set are exactly the same, for example, the first carrier set includes the corresponding carrier set directly discovered by ProSe, and the second carrier set includes the corresponding carrier set directly discovered by ProSe set), then the probability that the second terminal device receives the target message will be further improved.

In the above step 301, the target message may be unicast, multicast or broadcast. The source ID and destination ID of the target message are used to send the target message. For broadcast, the destination identifier used to send the target message may be the destination identifier corresponding to the service. For example, the services may be V2X services and ProSe services. When the service includes a V2X service, the destination identifier corresponding to the service may be the destination identifier corresponding to the V2X service type. The V2X service type is a type of V2X service, consisting of an intelligent transport systems application identifier (ITS-AID), a provider service identifier (PSID) or an application identifier AID (AID ) logo. When the service includes a ProSe service, the destination identifier corresponding to the service may be the destination identifier corresponding to the ProSe service (ie, ProSe identifier). The ProSe identifier may be a globally unique identifier used to identify the ProSe application associated with ProSe operations in 5G ProSe direct discovery and 5G ProSe direct communication. For unicast, the destination identifier used to send the target message may include the identifier of the receiving end device. For multicast, the destination identifier used to send the destination message may include the group destination L2 ID.

In the above step 301, when N1 is an integer greater than 1, the first terminal device transmits on N1 carriers There are many possible implementations of sending at least two target messages. Two possible implementations are exemplarily introduced below through implementation A1 and implementation A2. When N1 is an integer greater than 1, the second terminal device may monitor on one carrier or on at least two carriers, which is not limited in the embodiment of this application. In the embodiment of this application, multiple target messages include the first message and the second message, and N1 carriers include the first carrier and the second carrier are used as examples for introduction. In actual applications, the number of target messages sent by the first terminal device and the number of carriers can be even greater. The related solutions are similar and will not be described again.

Embodiment A1

Figure 4a exemplarily introduces a schematic flowchart of a possible communication method in implementation mode A1.

As shown in Figure 4a, the above step 301 can be replaced by step 401, and step 401 can include step 401a and step 401b:

Step 401a, the first terminal device sends the first message on the first carrier through the side link;

Step 401b: The first terminal device sends the second message on the second carrier through the side link.

Step 402: The first terminal device monitors on the first carrier and monitors on the second carrier.

Step 403: The second terminal device monitors on one of the N2 carriers.

The content of step 403 is the same as the content of step 303, and will not be described again.

Step 404: The second terminal device receives at least one target message on a carrier among the N2 carriers.

The content of step 404 is the same as the content of step 304 and will not be described again.

Since the first terminal device sends the message on the first carrier and the second carrier, the N2 carriers used by the second terminal device for monitoring and the carriers (the first carrier and the second carrier) used by the first terminal device to send messages The probability of intersection between the two terminals is improved, which in turn increases the probability that the second terminal device receives the message sent by the first terminal device.

It is worth noting that in the embodiment of the present application, there is no absolute relationship between the N2 carriers and the carriers (the first carrier and the second carrier) used by the first terminal device to send messages. In the solution shown in Figure 4a, the N2 carriers may include one or more carriers. The N2 carriers may include at least one of the first carrier and the second carrier, or may not include the first carrier and not include the first carrier. The second carrier is not limited in the embodiment of this application.

In the above steps 401a and 401b, in one possible implementation, it can be understood that the first message and the second message are the same.

For example, the upper layer of the first terminal device generates the first message, the first terminal device copies the PDU containing the first message multiple times, and sends at least one PDU containing the first message through the first carrier, and sends the first message through the second carrier. The carrier sends at least one PDU containing the first message. It can also be understood that the PDU corresponding to the second message is the same as the PDU corresponding to the first message, or that the PDU containing the second message is the PDU containing the first message. The PDU can be a PDCP PDU.

In embodiment A1, the first message and the second message can be understood as two identical messages, or the second message can be understood as a copy of the first message. In a possible implementation, each target message may include a message sequence number (Sequence number). In embodiment A1, the sequence numbers of the first message and the second message may be the same. Furthermore, when the opposite end receives multiple target messages, it can determine that the first message and the second message received are the same two messages based on the message sequence number.

In a possible implementation, rules may be preset on the first terminal device side. The rules include: for the first message, the first terminal device may transmit multiple PDUs containing the first message on multiple logical channels. Wherein, the first terminal device transmits at least one PDU containing the first message on a logical channel through a carrier in the first carrier set, and the two carriers used by the first terminal device on two different logical channels are different (it can also be It is described that the two carriers corresponding to the two logical channels used by the first terminal device to send the two PDUs containing the first message are different).

In the embodiment of the present application, the source identifier and the destination identifier of a message sent through a logical channel can also be called a layer 2 identifier pair corresponding to the logical channel, and the source identifier in the layer 2 identifier pair is the sending end of the logical channel. Identifier, the destination identifier in the layer 2 identifier pair is the receiver identifier of the logical channel. In the embodiment of the present application, when the first terminal device transmits the first message through the logical channel, the first terminal device may select the sidelink resource on the carrier in the first carrier set corresponding to the logical channel for the first message, and then the first terminal device The first message is transmitted on the logical channel using sidelink resources on the carrier. Alternatively, the first terminal device may transmit the first message of the logical channel using a sidelink grant on a carrier in the first carrier set corresponding to the logical channel.

In another possible implementation manner, in the embodiment of the present application, the corresponding message types that can be transmitted can also be set for the SL SRB (for specific setting examples, please refer to the above description). For example, SL SRB0 can be used to transmit the initial signaling in the link establishment process of the communication process, and the first terminal device can transmit the message of SRB0 (or PDCP Packet Data Convergence Protocol (PDCP) protocol data unit ( protocol data unit (PDU)) is transmitted through this rule, that is, multiple copies of the SRB0 message are sent through multiple logical channels.

Since the first terminal device copies the first message into multiple PDUs and sends them on at least two carriers, it is possible to reduce the number of high-level layers on the first terminal device side (such as V2X layer, ProSe layer, PC5 signaling protocol layer, or AS The number of messages generated by the upper layers of the first terminal device side (such as the V2X layer, ProSe layer, PC5 signaling protocol layer, or the upper layers of the AS layer) can be reduced.

It is worth noting that in Embodiment A1, the time when the first terminal device sends the first message and the second message is not specifically limited, such as the time when the first message is sent on the first carrier and the time when the second message is sent on the second carrier. The time of the two messages can be the same or different.

Embodiment A2

In implementation manner A2, the first message and the second message may be two different target messages. That is to say, both the first message and the second message are generated by a high layer of the first terminal device (such as a V2X layer, a ProSe layer, a PC5 signaling protocol layer, or a high layer of the AS layer). The two target messages have different message sequence numbers (Sequence numbers), but the two target messages have the same purpose. Alternatively, it can also be understood that the message sequence numbers of the two target messages are different, and the contents of the two parts of the two target messages in the ProSe layer (or V2X layer) are the same.

For example, the first message and the second message are both used to request the establishment of a PC5 unicast link for V2X communication with other terminal devices.

For another example, both the first message and the second message are used to request the establishment of a PC5 unicast link for ProSe direct communication with other terminal devices.

For another example, both the first message and the second message are used to discover other terminal devices.

For another example, both the first message and the second message are used to discover other terminal devices that are interested in the first service.

The first terminal device may determine that there is a correlation between the first message and the second message, for example, based on the contents of the first message and the second message.

Figure 4b illustrates a schematic flowchart of a possible sidelink-based signaling/data transmission method in implementation mode A2. Figure 4b takes at least two carriers including a first carrier and a second carrier as an example. Introduction, in actual applications, the number of carriers used by the first terminal device to send target messages can be even greater, and the related solutions are similar and will not be described again.

As shown in Figure 4b, the above steps 301 and 302 can be replaced with the following content:

Step 411: The first terminal device sends the first message on the first carrier through the side link.

Step 412: The first terminal device monitors the first carrier.

Step 413: The second terminal device monitors on one of the N2 carriers.

The content of step 413 is the same as the content of step 303, and will not be described again.

Step 414: The first terminal device determines whether a message responding to the first message from other terminal devices is received within a preset first time period;

If a message responding to the first message is received from another terminal device (such as a second terminal device), step 415 is executed;

If not received, perform step 416.

Step 415: The first terminal device performs signaling/data transmission with the second terminal device on the first carrier based on the sidelink.

It is worth noting that when the first terminal device determines in step 414 that a message from the second terminal device in response to the first message is received within the preset first time length, then in the aforementioned step 413, the N2 carriers include one or Multiple carriers, and the N2 carriers need to include the first carrier. In this way, after step 411, the second terminal device can receive the first message on the first carrier, and the second terminal device sends a message to the first carrier within the preset first time period. A terminal device sends a message in response to the first message (the content is not shown in Figure 4b).

In another possible implementation, when the first terminal device determines in step 414 that no message in response to the first message from the second terminal device is received within the preset first time period, then in the aforementioned step 413, N2 The carriers include one or more carriers, and the N2 carriers may or may not include the first carrier, which is not limited in the embodiment of this application. After step 411, the second terminal device may receive the first message on the first carrier, or may not receive the first message on the first carrier, which is not limited in the embodiment of this application.

Step 416: The first terminal device sends the second message on the second carrier through the side link.

Step 417: The first terminal device monitors the second carrier.

If the first terminal device presets a duration (the duration may be the first duration, or may be a duration that is not equal to the first duration, the embodiment of the present application does not limit it, when the duration is the first duration, it may To make the solution simpler), if a message from another terminal device in response to the first message is received on the second carrier, for example, the direct communication accepts the message, the first terminal device can communicate with the second terminal device on the second carrier based on the side. Line link for signaling/data transmission.

If a duration is preset (the duration can be the first duration, or it can be a duration that is not equal to the first duration, the embodiment of the present application does not limit it. When the duration is the first duration, the solution can be made simpler ) does not receive a message in response to the first message from other terminal devices on the second carrier. If the first carrier set also includes other carriers, the first terminal device can continue to operate on the first carrier set. Messages for discovering other terminal devices or requesting to establish sidelinks with other terminal devices are sent on other carriers.

Since the first terminal device sends the message on the first carrier and the second carrier, the second terminal device is used to listen to the N2 carriers and the carrier (the first carrier and the second carrier) used by the first terminal device to send the message The probability of intersection is improved, which in turn can increase the probability that the second terminal device receives the message sent by the first terminal device.

In a possible implementation, rules can be preset on the first terminal device side. The rules include: for multiple target messages (such as the first message and the second message), the first terminal device sends messages on multiple different carriers. Transmit target message. Wherein, the first terminal device transmits at least one first message through one carrier in the first carrier set, and the first terminal device transmits at least one second message through another carrier in the first carrier set.

In the embodiment of this application, the corresponding message types that can be transmitted can also be set for the SL SRB (specific setting examples can be See the previous description). For example, SL SRB0 can be used to transmit initial signaling in the link establishment process of the communication process. Then the first terminal device can transmit the SRB0 message (or PDU) according to the rules, that is, send the SRB0 message according to the above rules.

For example, the first terminal device presets SL SRB0 to correspond to the first logical channel. When the first terminal device needs to send the first message, since the first message is transmitted through SL SRB0, the first terminal device selects a side link for the data of the first logical channel corresponding to SL SRB0 (including the data of the first message). When using path resources, you can select resources on one carrier (such as the first carrier) in the first carrier set; or, use the sidelink grant (grant) on one carrier (such as the first carrier) in the first carrier set. ) transmits the data of the first logical channel corresponding to SL SRB0 (that is, the data containing the first message).

When the first terminal device needs to send a second message, since the second message is transmitted through SRBO, and the destination identifier of the second message is the same as the destination identifier of the first message (or the destination identifier of the second message is the same as the destination identifier of the first message) are the same, and the source identifier of the second message is the same as the source identifier of the first message), therefore the first terminal device selects a side link for the data of the first logical channel corresponding to SL SRB0 (including the data of the second message) When using resources, select resources on another carrier in the first carrier set (a carrier different from the previously selected first carrier, such as the second carrier); or, use another carrier in the first carrier set (such as the second carrier). The sidelink grant (grant) on the carrier) transmits the data of the first logical channel corresponding to SL SRB0 (that is, the data containing the second message), so that the first terminal device takes turns to send the first logical channel through at least two different carriers. The purpose of the first message and the second message.

Based on the above content, it can be seen that in Embodiment A2, since the first terminal device can send at least two target messages on at least two carriers, this solution can increase the probability that the second terminal device receives the target message.

On the other hand, since the first terminal device can send the target message on at least two carriers in turn, the first terminal device can send one target message on one carrier within a period of time, thereby reducing the impact on the first terminal device. The capability requirement is such that terminal equipment that does not have the ability to send multiple messages on at least two carriers at the same time can also apply the solution provided by the embodiment of the present application.

It is worth noting that Figure 4b takes the first terminal device taking turns to send the target message on the first carrier and the second carrier as an example. In practical applications, the first terminal device can also take turns to send the target message on more carriers. , the relevant solutions are similar to those mentioned above and will not be described again. In addition, the logical channel in the embodiment of this application may be a logical channel corresponding to any one of SL SRB0, SL SRB1, SL SRB2, SL SRB3, and unicast DRB. Some examples in the embodiments of this application are introduced using SL SRB0 as an example. When applied to different scenarios, it can be specified that the SRB used for signaling in different application scenarios may be different. Therefore, when the SRB involved in the embodiments of this application is When the example of SRB0 is applied to other scenarios, you can also replace SRB0 with other SRBs as needed. For example, when the application scenario of the example involving SRB0 in the embodiment of the present application is changed to a discovery process scenario, SRB0 can be correspondingly replaced with SRB4. The relevant content is similar and will not be described again.

In the above step 303, the second terminal device may monitor on one carrier or on at least two carriers. There may be multiple implementation ways for the second terminal device to monitor on at least two carriers. The following is an exemplary introduction through implementation mode B1 and implementation mode B2. The embodiment of this application takes N2 carriers including the first carrier and the second carrier as an example for introduction.

Embodiment B1

Figure 5a illustrates a possible sidelink-based signaling/data transmission method in implementation mode B1. As shown in Figure 5a, the method includes:

Step 501: The first terminal device sends the target message on N1 carriers based on the sidelink.

The content of step 501 is similar to the content of step 301 and will not be described again.

Step 502: The first terminal device monitors N1 carriers used to send target messages.

The content of step 502 is similar to the content of step 302 and will not be described again.

Step 503: The second terminal device monitors the first carrier and monitors the second carrier.

The above step 503 can be regarded as a possible implementation of the above step 303.

Step 504: The second terminal device receives the target message on the first carrier and/or the second carrier.

The above step 504 can be regarded as a possible implementation of the foregoing step 304.

Since the second terminal device monitors on at least two carriers, the at least two carriers (the first carrier and the second carrier) used by the second terminal device to monitor are one of the N1 carriers used by the first terminal device to send messages. The probability of intersection between the two terminals is improved, which in turn increases the probability that the second terminal device receives the message sent by the first terminal device.

It is worth noting that in the solution shown in Figure 5a, the N1 carriers may include one or more carriers, and the N1 carriers may include at least one of the first carrier and the second carrier, or may not include the third carrier. One carrier does not include the second carrier, which is not limited in the embodiment of this application.

When the second terminal device monitors on at least two carriers, such as implementing the solution provided in Embodiment B1, the first terminal device may send the target message on one carrier or may send the target message on at least two carriers. In a possible implementation, implementation B1 can be used in conjunction with the aforementioned implementation A1. In this case, since the first terminal device sends the first message and the second message respectively through at least two carriers, therefore, the second An end device may receive a message on only one carrier or may receive multiple messages on at least two carriers.

For example, the second terminal device only receives the second message on the second carrier. In this case, the second terminal device can use the second carrier as a carrier for subsequent communication with the first terminal device.

For another example, the second terminal device receives the first message on the first carrier and the second message on the second carrier. When the second terminal device determines that the first message and the second message are the same message, the second terminal device can select a carrier from the first carrier and the second carrier (for example, it can select the carrier that received the first message earliest) using To send a message to the first terminal device. For example, the second terminal device can determine whether the first message and the second message are the same two messages based on the message sequence number. For example, the second terminal device determines the message sequence number in the first message and the message number of the second message. If the sequence numbers are the same, it can be determined that the first message and the second message are the same; conversely, if the second terminal device determines that the message sequence number in the first message and the message sequence number of the second message are not the same, it can be It is determined that the first message and the second message are not the same.

In another possible implementation, implementation B1 can be used in combination with the aforementioned implementation A2. For example, if the second terminal device receives the first message on the first carrier, the second terminal device may use the first carrier as the carrier for subsequent communication with the first terminal device. The second terminal device receives the second message on the second carrier again, and may still use the first carrier as a carrier for subsequent communication with the first terminal device. Alternatively, the second terminal device receives the second message on the second carrier, and uses the second carrier as a carrier for subsequent communication with the first terminal device. In this implementation, the second terminal device does not need to determine whether the first message and the second message are the same message.

For another example, the second terminal device does not receive the first message on the first carrier, but receives the second message on the second carrier. In this case, the second terminal device can use the second carrier as a follow-up message with the first message. The carrier wave used by terminal equipment to communicate. Further, the second terminal device can return a message to the first terminal device through the second carrier. After the second carrier receives the message, the first terminal device can stop sending other target messages, and can use the second carrier as A carrier wave for subsequent communication with the first terminal device.

Embodiment B2

In embodiment B2, in the above step 303, the second terminal device may take turns to monitor on at least two carriers.

Figure 5b illustrates a possible sidelink-based signaling/data transmission method in implementation mode B2. As shown in Figure 5b, the method includes:

Step 511: The second terminal device monitors the first carrier.

Step 512: The second terminal device determines whether sidelink messages from other terminal devices are received on the first carrier within the preset second time period;

If received, execute step 513;

If not received, perform step 514.

The second duration may be equal to the first duration, or may not be equal.

Step 513: The second terminal device performs signaling/data transmission with the first terminal device on the first carrier based on the sidelink.

It is worth noting that, if in step 512, the second terminal device receives side link messages from other terminal devices on the first carrier within the preset second time period, then before step 512, the first terminal device The message is sent on at least the first carrier. The solution in Figure 5b is combined with the solution shown in Figure 3. In this case, N1 is 1 or an integer greater than 1, and the N1 carriers include at least the first carrier. .

In another possible implementation, if in step 512, the second terminal device does not receive side link messages from other terminal devices on the first carrier within the preset second time period, then before step 512 , the first terminal device may have sent the message on the first carrier, or may not have sent the message on the first carrier, which is not limited by the embodiments of this application. The solution in Figure 5b is combined with the solution shown in Figure 3. In this case, N1 is 1 or an integer greater than 1, and the N1 carriers may or may not include the first carrier. This application The examples are not limiting.

Step 514: The second terminal device monitors the second carrier.

Similarly, the second terminal device determines whether sidelink messages from other terminal devices are received on the second carrier within a preset period of time (such as the second period of time), for example, in order to establish a PC5 unicast link If the initial message or the message in the related process of the sidelink-based discovery process is received (such as the aforementioned first message or the second message), the second terminal device can communicate with the first terminal device on the second carrier. Signaling/data transmission is based on sidelinks. The solution shown in Figure 5b can also be regarded as a possible implementation of the above steps 303 and 304. The first terminal device side may execute the related solutions shown in the aforementioned step 301 and step 302, which are not shown or limited in Figure 5b.

Since the second terminal device can monitor on at least two carriers in turn, the second terminal device can monitor on one carrier within a period of time, thereby reducing the capability requirements for the second terminal device so that it does not have the ability to monitor on at least two carriers at the same time. The solutions provided by the embodiments of this application are also applicable to terminal devices that monitor on at least two carriers.

When the second terminal device monitors on at least two carriers, such as implementing the solution provided in embodiment B2, the first terminal device may send the target message on one carrier or may send the target message on at least two carriers. In a possible implementation, implementation B2 can be used in conjunction with the aforementioned implementation A1. In this case, since the first terminal device sends the first message and the second message respectively through at least two carriers, and because the second terminal The device may take turns listening on the first carrier and the second carrier, so it is possible that the second terminal device receives the first message on the carrier. rate can be improved.

In another possible implementation, implementation B2 can be used in conjunction with the aforementioned implementation A2. In this case, since the first terminal device sends the first message and the second message through the first carrier and the second carrier in turn, And because the second terminal device can take turns monitoring on the first carrier and the second carrier, compared with the solution where the first terminal device only sends messages through one carrier, and the second terminal device only monitors on one carrier, this application The solution provided by the embodiment can improve the probability that the second terminal device receives the target message on the carrier.

Based on the content shown in any one of the embodiments in FIG. 3, FIG. 4a, FIG. 4b, FIG. 5a and FIG. 5b, FIG. 6a exemplarily shows yet another possible sidelink-based signaling/data transmission. Schematic flow diagram of the method.

As shown in Figure 6a, the method includes:

Step 601: The second terminal device sends a third message to the first terminal device on the second carrier.

Correspondingly, the first terminal device receives the third message on the second carrier.

It is worth noting that when the solution shown in Figure 6a is used in combination with the solution shown in Figure 3, step 601 in Figure 6a needs to be executed after step 304 in the solution shown in Figure 3, and as shown in Figure 6a In the solution, the N1 carriers in the aforementioned step 301 include the second carrier, and the N2 carriers in the aforementioned step 303 also include the second carrier.

On the other hand, in the above step 304, if the second terminal device receives the target message on one carrier (such as the second carrier), the second terminal device can send the third message on the carrier (such as the second carrier). . In the case where the second terminal device receives multiple target messages on at least two carriers, the second terminal device may select one of the at least two carriers to send the third message. For example, it may select randomly or select the earliest received message. The carrier of the target message. In Figure 6a, the second terminal device selects the second carrier to send the third message as an example for illustration.

In the case where the target message can be a message in the communication process, for example, the target message is the direct communication request message in Figure 2a, in this case, the third message can be the security establishment process message in Figure 2a or the security establishment process message in Figure 2a. The direct communication accepts the message.

For another example, the target message is the direct communication request message in the link establishment process of ProSe direct communication, and the third message can be the security establishment process message in the link establishment process of ProSe direct communication or the link establishment process of ProSe direct communication. Direct communication in accepts messages.

In the case where the target message can be a message in the discovery process, for another example, the target message can be a request message in the link establishment process directly discovered by ProSe, and the third message can be the request in the link establishment process directly discovered by ProSe. The response message of the message.

For another example, the target message is a request message in the link establishment process discovered by the relay, and the third message may be a response message to the request message in the link establishment process discovered by the relay.

Step 602: The second terminal device determines the second carrier as the carrier used for transmitting signaling/data with the first terminal device.

In the embodiment of the present application, when the solution shown in Figure 6a is used in combination with the solution shown in Figure 3, step 602 can also be executed after step 304 and before step 601, or can be executed after step 601. The implementation of this application Examples are not limited.

Step 603: The second terminal device monitors the second carrier.

Step 604: The first terminal device sends a fourth message to the second terminal device on the second carrier.

Correspondingly, the second terminal device receives the fourth message on the second carrier.

The first terminal device performs signaling/data transmission with the second terminal device based on the sidelink on the second carrier.

In the case where the target message may be a message in the communication process, for example, the target message may be the direct communication request message in Figure 2a, the third message may be a message used to establish security, and the fourth message may be a message used to establish security. .

In the case where the target message can be a message in the communication process, for another example, the target message is a direct communication request message in the link establishment process of ProSe direct communication, and the third message is a user in the link establishment process of ProSe direct communication. A message for establishing security. In this case, the fourth message may be a message for establishing security.

It can be seen from the solution shown in Figure 6a that the second terminal device can determine a carrier for subsequent message transmission with the first terminal device from one or more carriers that receive the target message, such as the second carrier, Since the second terminal device sends the third message to the first terminal device based on the second carrier, the first terminal device may also determine the second carrier as after receiving the third message from the second terminal device on the second carrier. A carrier wave for transmitting messages with the second terminal device. Since the second terminal device monitors on the second carrier after sending the third message to the first terminal device on the second carrier, the fourth message sent by the first terminal device to the second terminal device on the second carrier can be relatively It is likely to be successfully received by the second terminal device.

That is to say, after the first terminal device and the second terminal device determine a carrier (such as the second carrier) for subsequent transmission of messages, the first terminal device does not need to If the message is sent on multiple carriers, but only on the second carrier, the message can be successfully received by the second terminal device with a higher probability. Since the first terminal device does not need to send the message on multiple carriers when sending a message to the second terminal device, power consumption and communication resources can be saved.

It is worth noting that the first terminal device in the embodiment of the present application may first perform the discovery process and then perform the communication process. For example, the first terminal device first performs ProSe direct discovery and performs ProSe direct communication with the discovered second terminal device. For another example, the first terminal device may first perform ProSe relay discovery and perform ProSe relay communication with the discovered second terminal device.

In a possible implementation, in the discovery process, the first terminal device may adopt the relevant content of the discovery process in the solution shown in FIG. 3, FIG. 4a, FIG. 4b, FIG. 5a, FIG. 5b or FIG. 6a. In the communication process, the first terminal device may also adopt the relevant content solution of the communication process in the solution of FIG. 3, FIG. 4a, FIG. 4b, FIG. 5a, FIG. 5b or FIG. 6a.

In another possible implementation, in the discovery process, the first terminal device can adopt the relevant content of the discovery process in the solution shown in Figure 3, Figure 4a, Figure 4b, Figure 5a, Figure 5b or Figure 6a, and then The communication process can be performed based on the selected carrier (eg, the second carrier).

It is worth noting that in this implementation, if the first terminal device adopts the solution shown in Figure 2b, then in this implementation, the target message may be a discovery message, and the third message may be between the first terminal device and the third The initial message for the second terminal device to establish a PC5PC5 unicast link (such as a V2X communication PC5 unicast link or a ProSe direct communication PC5 unicast link). For example, the third message can be a direct communication request message, and the fourth message can be a security establishment message. Process messages.

In this implementation, if the first terminal device adopts the solution shown in FIG. 2c, then in this implementation, the target message may be a request message, and the third message may be a response message to the request message. The fourth message may be an initial message for establishing a PC5PC5 unicast link (such as a V2X communication PC5 unicast link or a ProSe direct communication PC5 unicast link) between the first terminal device and the second terminal device. For example, the fourth message may be a direct message. Communication request message.

Figure 6b illustrates another schematic diagram of the method flow of Figure 6a. As shown in Figure 6b, the first terminal device sends DCR on the first carrier and the second carrier respectively, and the second terminal device sends DCR on the second carrier. After receiving the DCR and sending a third message to the first terminal device on the second carrier (the third message may be a message for establishing security), the first The terminal device sends a fourth message to the second terminal device on the second carrier (the fourth message may be a message used to establish security).

Based on the above content, FIG. 7 exemplarily shows a schematic flowchart of yet another possible sidelink-based signaling/data transmission. The method shown in Figure 7 can be executed by the first terminal device or by the second terminal device. The following is introduced by taking the first terminal device executing the solution in Figure 7 as an example.

As shown in Figure 7, the method includes:

Step 701: The first terminal device determines association relationship one. The association relationship 1 includes the association relationship between the destination identifier and the carrier, or the association relationship between the source identifier, the destination identifier and the carrier.

Step 702: The first terminal device sends message three according to association relationship one.

The source ID and destination ID of message three are used to send message three. The source identifier corresponding to message three includes the layer two identifier of the sender of message three, that is, the layer two identifier of the first terminal device. The destination identifier corresponding to message three includes the layer two identifier of the receiving end of message three. In order to make the distinction easier, the introduction will be made taking the receiving end of message three as the second terminal device as an example. The destination identifier corresponding to message three includes the layer 2 identifier of the second terminal device.

In a possible implementation, after generating message three, the first terminal device may determine whether the corresponding destination identifier (or source identifier and destination identifier) of message three (which may be called data to be sent) is associated with a carrier.

For example, if the first terminal device determines that the corresponding destination identifier (or source identifier and destination identifier) of message three is not associated with a carrier, then the first terminal device associates the destination identifier (or source identifier and destination identifier) corresponding to message three with the second carrier. The second carrier may be the carrier on which the data received by the first terminal device from the second terminal device (for distinction, the data received by the first terminal device from the second terminal device may be called message four), and the message The source identifier of message four is the destination identifier of message three (or, the source identifier of message four is the destination identifier of message three, and the destination identifier of message four is the source identifier of message three).

For another example, if the first terminal device determines that the destination identifier (or source identifier and destination identifier) of message three has an associated carrier, then when selecting a sidelink resource for message three, the destination identifier (or source identifier) can be selected. resources on the carrier associated with the destination identifier), or use the sidelink grant (grant) on the carrier associated with the destination identifier (or source identifier and destination identifier) to transmit the message 3, thereby achieving the destination identifier ( or source identifier and destination identifier), the purpose of sending this message is on the carrier associated with it.

In another possible implementation, the first terminal device can also determine whether the source identifier (or destination identifier and source identifier) of message four (that is, the data received by the first terminal device from the second terminal device) is associated with a carrier. .

For example, if the first terminal device determines that the source identifier (or destination identifier and source identifier) of message four is associated with a carrier, then the source identifier (or destination identifier and source identifier) of message four is associated with the second carrier. is the carrier where message four is located. If the destination identifier of the first terminal device in subsequently sending data is the source identifier of message four (or, the destination identifier of subsequent data transmission is the source identifier of message four and the source identifier of subsequent data transmission is the destination identifier of message four) , then when selecting sidelink resources for the subsequent transmission data, the resources on the second carrier can be selected, or the subsequent transmission data can be transmitted using a sidelink grant on the second carrier.

In the embodiment of the present application, the logical channel may correspond to a source identifier and a destination identifier. The source identifier of the logical channel may be the Layer 2 identifier of the sending end of the data of the logical channel. The destination identifier of the logical channel may be the receiving end of the data of the logical channel. Layer 2 identification. For example, the first terminal device may set the destination identifier of the logical channel (such as the second logical channel) used to send messages to the second terminal device as the layer 2 identifier of the second terminal device, and set the source identifier of the logical channel to Set as the layer 2 identification of the first terminal device. The second logical channel may be SL SRB0, SL SRB1, SL SRB2, The logical channel corresponding to any one of SL SRB3, unicast DRB, and SL SRB4. Further, the first terminal device may determine whether the destination identifier (or source identifier and destination identifier) corresponding to the second logical channel (or data to be sent on the second logical channel) used to send the message to the second terminal device is associated with If the carrier is not associated with a carrier, the destination identifier (or source identifier and destination identifier) corresponding to the second logical channel is associated with the second carrier (it can also be understood that the logical channel is associated with the second carrier). The second carrier may be the carrier where message four of the first terminal device is located, and the source identifier of message four is the destination identifier corresponding to the second logical channel (or, the source identifier of message four is the destination identifier corresponding to the second logical channel). identification and the destination identification of message four is the source identification corresponding to the second logical channel).

For the destination identifier (or source identifier and destination identifier) corresponding to the logical channel or MAC Medium Access Control (MAC) control element (CE), if the destination identifier (or source identifier and destination identifier) If there is a carrier associated with it, when selecting sidelink resources for this logical channel or MAC CE, you can select the resources on the carrier associated with the destination identifier (or source identifier and destination identifier), or use the destination identifier (or, The sidelink grant (grant) on the carrier associated with the destination identifier (source identifier and destination identifier) transmits the logical channel or MAC CE, thereby achieving the purpose of sending the logical channel or MAC CE on the carrier associated with the destination identifier (or source identifier and destination identifier). The purpose of MAC CE.

The solution provided in Figure 7 in the embodiment of the present application can be implemented alone, or can be used in combination with the methods provided in Figure 3, Figure 4a, Figure 4b, Figure 5a, Figure 5b, and Figure 6a. For example, if the solution in Figure 7 is used in combination with the method provided in Figure 6a, the first terminal device side can use the method provided in Figure 7, the fourth message can be regarded as message three in Figure 7, and the third message can be regarded as message four. Before the aforementioned step 604, the first terminal device can execute the solution provided in the aforementioned step 701, which specifically includes:

The first terminal device may determine the first association relationship. The first association relationship includes an association relationship between a destination identifier and a carrier, or an association relationship between a source identifier, a destination identifier, and a carrier. When the first terminal device side implements the solution on the first terminal device side, the first association relationship may be the above-mentioned association relationship one.

Further, in the aforementioned step 604, the first terminal device may send a fourth message according to the first association relationship.

That is to say, when the first terminal device subsequently sends a message (such as the fourth message), it can determine the carrier associated with the destination identifier used to send the message, or determine the carrier associated with the destination identifier used to send the message. carrier, and then send the message through that carrier. The first terminal device may select resources on the carrier for sending the message. The first terminal device may send the message using a sidelink grant on the carrier.

For convenience of introduction, an example is introduced below. In this example, the first association relationship includes: the association relationship between the first destination identifier and the second carrier. Alternatively, the first association relationship includes: an association relationship between the first source identifier, the first destination identifier and the second carrier. The first source identification includes a layer two identification of the first terminal device. The first destination identification includes the layer 2 identification of the second terminal device.

Assume that the source identifier corresponding to the second logical channel is the layer 2 identifier of the first terminal device, the destination identifier corresponding to the second logical channel is the layer 2 identifier of the second terminal device, and the second logical channel is the first terminal device to the second terminal device. The logical channel used by the device to send messages. Since the first terminal device receives the third message from the second terminal device on the second carrier, the layer two identity of the second terminal device (or the layer two identity of the first terminal device and the layer two identity of the second terminal device) can be established. The association between the layer 2 identifier) and the second carrier. In step 604, the first terminal device generates a fourth message, the source identifier of the fourth message is the source layer 2 identifier of the first terminal device, and the destination identifier of the fourth message is the destination layer 2 identifier of the second terminal device. The first terminal device determines that the fourth message needs to be sent through the second logical channel according to the fourth message, and determines the layer 2 identifier of the second terminal device (or, the layer 2 identifier of the first terminal device and the layer 2 identifier of the second terminal device ) There is an association relationship with the second carrier, so the first terminal device selects resources on the second carrier, or uses a sidelink grant on the second carrier to transmit the fourth message. It can also be understood that the first terminal device determines that the carrier used to transmit the fourth message is the second carrier according to the first association relationship, and then sends the fourth message to the second terminal device through the second carrier.

In another possible implementation, the solution in Figure 7 is used in conjunction with the method provided in Figure 6a. The second terminal device side can also use the method provided in Figure 7, and when the second terminal device executes the solution provided in Figure 7 , the third message can be regarded as message three, and the target message can be regarded as message four. Specifically, the second terminal device side executes the solution provided in the above step 701, and the specific content may include:

The second terminal device may determine the second association relationship. The second association relationship includes the association relationship between the destination identifier and the carrier, or the association relationship between the source identifier, the destination identifier, and the carrier. When the second terminal device side implements the above-mentioned solution on the first terminal device side, the second association relationship may be the above-mentioned association relationship one.

Further, in the above step 601, the second terminal device may send a third message according to the second association relationship.

That is to say, when the second terminal device needs to send a message (such as a third message) after determining the second association relationship, it can determine the carrier associated with the destination identifier of the message, or determine the association between the destination identifier and the source identifier of the message. carrier, and then send the message through that carrier.

For convenience of introduction, an example is introduced below. In this example, the second association relationship includes: the association relationship between the second destination identifier and the second carrier. Alternatively, the second association relationship includes: an association relationship between the second source identifier, the second destination identifier and the second carrier. The second source identification includes the layer two identification of the second terminal device. The second destination identification includes the layer 2 identification of the first terminal device.

When the solution in Figure 7 is used in conjunction with the method provided in Figure 6a, in the above step 601, when the second terminal device needs to send a third message, it can first determine the source identifier and purpose for sending the third message. Identifies whether the carrier is associated, if not. Since the second terminal device receives the message from the first terminal device on the second carrier (or the second terminal device receives the message from the first terminal device on multiple carriers (including the second carrier), the second terminal device The second carrier is determined to be a carrier for data transmission with the first terminal device; or because the second carrier is a preset carrier for transmitting messages between the second terminal device and the first terminal device), therefore, the second terminal device An association relationship between the layer 2 identifier of the first terminal device (or the layer 2 identifier of the first terminal device and the layer 2 identifier of the second terminal device) and the second carrier may be established. The second terminal device produces a third message, the source identifier of the third message is the layer 2 identifier of the second terminal device, and the destination identifier of the third message is the layer 2 identifier of the first terminal device. When sending the third message, the second terminal device may select the second carrier on the second carrier associated with the layer 2 identifier of the first terminal device (or the layer 2 identifier of the first terminal device and the layer 2 identifier of the second terminal device). resources, or use a sidelink grant on the second carrier to transmit the third message.

It is worth noting that for the related solutions of establishing the second association relationship on the second terminal device side and using the second association relationship, please refer to the related descriptions of establishing the first association relationship and using the first association relationship on the first terminal device side. This will not be described again.

The above-mentioned step of determining the second association relationship by the second terminal device may be performed before step 601 or after step 601, and is not limited in this embodiment of the present application. The association relationships mentioned in the embodiments of this application (such as the first association relationship and the second association relationship) can also be called correspondence relationships. The first association relationship can be replaced by the first correspondence relationship, and the second association relationship can be replaced by the second association relationship. Correspondence.

According to the contents shown in the above-mentioned Figures 1a, 1b, 1c, 2a, 2b, 2c, 2d and 2e, Figure 8 exemplarily shows a side link-based method provided by an embodiment of the present application. Flowchart of signaling/data transmission method. In Figure 8, the method is introduced by taking the method executed by the first terminal device and the second terminal device as an example. In the embodiment of the present application, the solution executed by the first terminal device side can also be executed by the unit, module or chip inside the first terminal device, and the solution executed by the second terminal device side can also be executed by the unit, module or chip inside the second terminal device. chip execution. The first terminal device and the second terminal device may be the two terminal devices in the aforementioned Figure 1a, Figure 1b or Figure 1c. The relevant content is similar to the relevant content in Figure 3 and will not be described again.

As shown in Figure 8, the method includes:

Step 801: The first terminal device sends a target message on a preset carrier. The preset carrier is a carrier among at least two carriers configured for the sidelink.

Step 802: The first terminal device monitors the preset carrier.

Step 803: The second terminal device monitors the preset carrier.

Optionally, step 803 may be performed simultaneously with step 801, or may be performed before or after step 801. When step 803 is performed before step 801, it will help the second terminal device receive the target message from the first terminal device in a timely manner.

Step 804: The second terminal device receives the target message on the preset carrier.

Further, after step 804, it may also include:

Step 805: The second terminal device sends the third message to the first terminal device on the preset carrier.

Correspondingly, the first terminal receives the third message on the preset carrier.

Step 806: The first terminal device sends a fourth message to the second terminal device on the preset carrier.

Correspondingly, the second terminal device receives the fourth message on the preset carrier.

In this embodiment of the present application, when at least two carriers are configured for the sidelink, a preset carrier may be preset. Compared with the solution where the first terminal device randomly selects a carrier to send the target message, and the second terminal device randomly selects a carrier for monitoring, since the first terminal device sends the target message on the preset carrier, and the second terminal device sends the target message on the preset carrier, The target message is received on the carrier, thereby improving the probability that the second terminal device receives the target message from the first terminal device.

The preset carrier in this embodiment of the present application may also be called a default carrier. For the relevant content of the target message in the embodiment of the present application, please refer to the relevant description in Figure 3, and will not be described again here.

The preset carrier in the embodiment of the present application can be used for sidelink signaling/data transmission. For example, the preset carrier can transmit signaling for discovering other terminal devices, signaling for requesting the establishment of unicast links with other terminal devices, and signaling/data after the unicast connection is established. .

In this embodiment of the present application, a preset carrier can be configured for one or more services. For example, a preset carrier can be configured for the ProSe service and a preset carrier can be configured for the V2X service. The two preset carriers can be the same or different. The first terminal device can obtain the corresponding relationship between the service and the preset carrier, and then can select the preset carrier corresponding to the service according to the service corresponding to the target message to transmit the target message.

The solution provided in Figure 8 can be used in combination with the solution provided in Figure 7 above. For example, in the above step 801, when the first terminal device needs to send a target message, it can first determine whether the source identifier and the destination identifier used to send the target message are associated with a carrier. If not, the determined target message can be The preset carrier corresponding to the message is associated with the source identifier and destination identifier used to send the target message. Then, when sending the target message, the first terminal device can select resources on the associated preset carrier, or use a sidelink grant on the preset carrier to transmit the target message.

For another example, in the above step 801, when the first terminal device needs to send a target message, it can first determine Whether the source identifier and destination identifier of the logical channel used to send the target message are associated with a carrier. If not, the preset carrier corresponding to the determined target message can be associated with the source identifier and destination identifier of the logical channel. Then, when the first terminal device needs to send the target message through the logical channel, it can select the resources on the preset carrier associated with the logical channel, or use the sidelink grant on the preset carrier to transmit the logical message. Target message on the channel.

In the above step 805, when the second terminal device needs to send the third message, it can first determine whether the source identifier and the destination identifier used to send the third message are associated with a carrier. If not, the determined third message can be The preset carrier corresponding to the three messages is associated with the source identifier and destination identifier used to send the third message. Then, when sending the third message, the second terminal device may select resources on the associated preset carrier, or use a sidelink grant on the preset carrier to transmit the third message.

In the above step 805, when the second terminal device needs to send the third message, it can first determine whether the source identifier and the destination identifier of the logical channel used to send the third message are associated with a carrier. If not, it can The preset carrier corresponding to the determined third message is associated with the source identifier and destination identifier of the logical channel. Then, when the second terminal device needs to send the third message through the logical channel, it can select the resources on the preset carrier associated with the logical channel, or use the sidelink grant on the preset carrier to transmit the third message. The third message on the logical channel.

In the above step 806, when the first terminal device needs to send the fourth message, it may first determine whether the source identifier and the destination identifier used to send the fourth message are associated with a carrier. Because when sending the target message, the source identifier and the destination identifier used to send the target message have been associated with the preset carrier corresponding to the target message, and the source identifier used to send the fourth message is the same as the source identifier used to send the target message. , the destination source identifier used to send the fourth message is the same as the destination identifier used to send the target message. Therefore, the source identifier used to send the fourth message and the destination identifier are associated carriers, that is, the preset carrier corresponding to the target message. The second terminal device needs to select resources on the associated preset carrier, or use a sidelink grant on the preset carrier to transmit the fourth message.

In the above step 806, when the first terminal device needs to send the fourth message, it may first determine whether the source identifier and the destination identifier of the logical channel used to send the fourth message are associated with a carrier. Since the source identifier and the destination identifier of the logical channel used to send the target message have been associated with the preset carrier corresponding to the target message when the target message is sent, and the source identifier of the logical channel used to send the fourth message is not the same as the source identifier used to send the fourth message, The source identifier of the logical channel used to send the target message is the same. The destination source identifier of the logical channel used to send the fourth message is the same as the destination identifier of the logical channel used to send the target message. Therefore, the source identifier of the logical channel used to send the fourth message is the same. The carrier identified is associated with the destination identifier, that is, the preset carrier corresponding to the logical channel used to send the target message. The second terminal equipment needs to select resources on the preset carrier associated with the logical channel, or use a sidelink grant on the preset carrier to transmit the fourth message on the logical channel.

In another possible implementation manner, in the embodiment of the present application, in the above step 801, when the first terminal device determines that the source identifier and the destination identifier of the logical channel used to send the target message are not associated with a carrier, the first terminal device may also It is not necessary to associate a preset carrier with the logical channel, but the source identifier and destination identifier of the logical channel remain in a state of not being associated with a carrier. In one possible implementation, when the first terminal device determines that the source identifier and the destination identifier of the logical channel used to send the target message are not associated with a carrier, the first terminal device uses a preset carrier to send the target message.

In the above step 805, similarly, when the second terminal device determines that the source identifier and the destination identifier of the logical channel used to send the third message are not associated with a carrier, it is not necessary to associate the preset carrier with the logical channel. Instead, the source identifier and destination identifier of the logical channel are kept in a state where they are not associated with a carrier. In one possible implementation, when the second terminal device determines that the source identifier and the destination identifier of the logical channel used to send the third message are not associated with a carrier, the second terminal device uses a preset carrier to send the third message.

In the above step 806, similarly, when the first terminal device determines that the source identifier and the destination identifier of the logical channel used to send the fourth message are not associated with a carrier, it is not necessary to associate the preset carrier with the logical channel. Instead, the source identifier and destination identifier of the logical channel are kept in a state where they are not associated with a carrier. In one possible implementation, when the first terminal device determines that the source identifier and the destination identifier of the logical channel used to send the fourth message are not associated with a carrier, the first terminal device uses a preset carrier to send the fourth message.

The association between the source identifier, destination identifier of the logical channel and the carrier involved in the above content can also be replaced by the association between the destination identifier of the logical channel and the carrier, that is, the association does not need to include the source identifier. The relevant solution is the same as the above content Similarly, for relevant content, please refer to the relevant description in Figure 7 and will not be described again.

It is worth noting that after a PC5 unicast connection is established between the first terminal device and the second terminal device, the first terminal device and the second terminal device can update/modify/configure/release/activate/deactivate the first terminal device. A carrier used for sidelink signaling/data transmission between the terminal device and the second terminal device. When the first terminal equipment updates/modifies/configures/releases/activates/deactivates the carrier used for sidelink signaling/data transmission between the first terminal equipment and the second terminal equipment, the first terminal equipment needs to update The carrier associated with the destination identifier (or source identifier and destination identifier) of the logical channel used for sidelink signaling/data transmission between the first terminal device and the second terminal device. For example, the first terminal device may update/ The modified/configured/activated carrier is associated with the destination identifier (or source identifier and destination identifier) of the logical channel, and the released/deactivated carrier is associated with the carrier with the destination identifier (or source identifier and destination identifier) of the logical channel. Delete in.

According to the contents shown in Figure 1a, Figure 1b, Figure 1c, Figure 2a, Figure 2b, Figure 2c, Figure 2d and Figure 2e, Figure 9a exemplarily shows a side link-based method provided by an embodiment of the present application. Flowchart of signaling/data transmission method. In Figure 9a, the method is introduced by taking the method executed by the first terminal device and the second terminal device as an example. In the embodiment of the present application, the solution executed by the first terminal device side can also be executed by the unit, module or chip inside the first terminal device, and the solution executed by the second terminal device side can also be executed by the unit, module or chip inside the second terminal device. chip execution. The first terminal device and the second terminal device may be the two terminal devices in the aforementioned Figure 1a, Figure 1b or Figure 1c. The relevant content is similar to the relevant content in Figure 3 and will not be described again.

As shown in Figure 9a, the method includes:

Step 901: The first terminal device obtains second indication information, and the second indication information indicates one or more second time periods.

The second indication information may be preconfigured or configured by the network device. In this embodiment of the present application, the second indication information may be configured by the network device to the first terminal device, or may be preconfigured or specified by the protocol. If the first terminal device obtains the second indication information from the network device, it may obtain it through control signaling. The control signaling carries the second indication information, or the second indication information is configured by the control signaling. Among them, the control signaling can be a radio resource control (radio resource control, RRC) message, media access layer signaling, media access layer control element (medium access control control element, MAC CE), system information block (system information block) , SIB) or master information block (MIB).

Step 902: The first terminal device operates on the third carrier in the second time period.

The first terminal device operating on the third carrier in the second time period can be understood as: the first terminal device performs at least one of the following contents in one or more second time periods: the first terminal device performs operations on the third carrier Monitor; or, the first terminal device transmits the message based on the sidelink on the third carrier.

Step 903: The first terminal device obtains first indication information, and the first indication information indicates one or more first time periods.

The first indication information may be pre-configured or configured by the network device. For related content, please refer to the description of the second indication information, which will not be described again.

Step 904: The first terminal device operates on one or more carriers except the third carrier during the first time period.

The first terminal device may establish a link or discover other terminal devices within the first time period.

It is worth noting that in this embodiment of the present application, the first terminal device does not need to obtain the first indication information, and can determine one or more first time periods based on the second indication information. For example, the first time period can be determined except for the second time period. The time outside is determined as one or more first time periods.

Similarly, the first terminal device does not need to obtain the second indication information, and can determine one or more second time periods based on the first indication information. For example, the time other than the first time period can be determined as one or more second time periods. Multiple second time periods.

In the embodiment of the present application, the first terminal device may also work on multiple carriers in the second time period. In the embodiment of the present application, the first terminal device operates on the third carrier in the second time period as an example. One or more carriers used by the first terminal device during the first time period are different from one or more carriers used by the first terminal device during the second time period. For example, any one of the one or more carriers used by the first terminal device in the first time period is different from any one of the one or more carriers used by the first terminal device in the second time period.

In yet another possible implementation, the first terminal device can obtain the first configuration information, which indicates the time division multiplexing pattern (pattern) in which the first terminal device operates. Figure 9b illustrates one possibility. A schematic diagram of a time division multiplexing pattern (pattern) in which the first terminal device operates, as shown in Figure 9b. The first configuration information indicates multiple working cycles, and each working cycle includes a first time period and a second time period. The first terminal device may operate on one or more carriers other than the third carrier during the first time period, and operate on the third carrier during the second time period.

In a possible implementation, before step 901, the first terminal device may have already worked on the third carrier. When it is determined that it needs to work on one or more carriers other than the third carrier, and the first terminal device Simultaneous operation of the third carrier and one or more carriers other than the third carrier is not supported. In this case, the first terminal device can work in a time division multiplexing manner through the solution provided in Figure 9a.

In this way, the first terminal device can work on different carriers in the first time period and the second time period. When the capability of the first terminal device is low, for example, it does not support operating on the third carrier and one or more other carriers at the same time. When working, the first terminal equipment may work on the third carrier in the second time period, and work on one or more carriers other than the third carrier in the first time period. Through the time division multiplexing method, the first terminal equipment The device achieves the purpose of working on the third carrier and one or more other carriers. And this solution can reduce the requirements on the capabilities of the first terminal device, thereby reducing the cost of the first terminal device.

Further, after step 902, the first terminal device can also execute:

Step 905: The first terminal device sends third indication information on the third carrier. The third indication information is used to instruct the first terminal device to transmit messages based on the sidelink on the third carrier in one or more second time periods.

For example, before the above-mentioned step 901, the first terminal equipment and the third terminal equipment perform signaling/data transmission based on the sidelink on the third carrier. Then after step 902, the first terminal equipment needs to perform signaling/data transmission on a third carrier. If the first terminal device operates on the third carrier during one or more second time periods, the first terminal device needs to send the third instruction information to the third terminal device on the third carrier to inform the third terminal device that the first terminal device only operates on one or more second time periods. The second time period works on the third carrier, so, The third terminal device can also change the working mode. For example, the third terminal device can also communicate with the first terminal device based on the side link on the third carrier during one or more second time periods. In time periods other than the second time period, signaling/data transmission is no longer performed based on the third carrier and the first terminal device based on the sidelink. Therefore, it can be avoided that the third terminal device sends a message to the first terminal device on the third carrier at a time other than the second time period, but the first terminal device cannot receive the message.

It is worth noting that the first terminal device can inform the third terminal device of the time period (second time period) in which the first terminal device can operate on the third carrier, or it can also inform the third terminal device that the first terminal device cannot operate on the third carrier. Information during the time period during which the third carrier operates (the first time period). The third terminal device can determine a time period in which the third terminal device and the first terminal device can perform signaling/data transmission based on the sidelink based on the third carrier based on either of the two pieces of information. In another possible implementation, the third terminal device may obtain the second indication information. The second indication information may be pre-configured on the third terminal device side, or may be issued by the base station to the third terminal device. side.

The solution shown in Figure 9a can also be used in conjunction with the methods provided in Figure 3, Figure 4a, Figure 4b, Figure 5a, Figure 5b, Figure 6a, Figure 7, and Figure 8. For example, the first terminal device can be in one or more Execute the first terminal device side solution in the method provided in the above-mentioned Figure 3, Figure 4a, Figure 4b, Figure 5a, Figure 5b, Figure 6a, Figure 7, and Figure 8 within a first time period, except for the first time period During the time period, the first terminal device side solution in the methods provided in FIG. 3, FIG. 4a, FIG. 4b, FIG. 5a, FIG. 5b, FIG. 6a, FIG. 7, and FIG. 8 is no longer executed.

For example, the first terminal device may perform step 301 within one or more first time periods and send multiple target messages on multiple carriers through side links. For relevant content, please refer to the above description and will not be repeated again.

It is worth noting that the first terminal device may also send fourth indication information on the carrier operating in the first time period. The fourth indication information is used to inform other terminal devices that the first terminal device is operating in one or more first time periods. The operating carrier. For example, if the first terminal device operates on the second carrier (or is a preset carrier) during the first time period, such as communicating with the second terminal device based on the sidelink on the second carrier, the first terminal device needs to Send fourth indication information to the second terminal device on the second carrier to inform the second terminal device that the first terminal device only operates on the second carrier during one or more first time periods. In this way, the second terminal device can also set In the corresponding working mode, for example, the second terminal device can also communicate with the first terminal device based on the side link on the second carrier in one or more first time periods. The second terminal device can communicate with the first terminal device in other than the first time period. The time period is no longer based on the second carrier and the first terminal device for signaling/data transmission based on the sidelink. Therefore, it can be avoided that the second terminal device sends a message to the first terminal device on the second carrier at a time other than the first time period, but the first terminal device cannot receive the message.

In the embodiment of the present application, one cycle may also include more time periods. In the embodiment of the present application, a cycle including a first time period and a second time period is used as an example for demonstration.

In the embodiments of this application, the first terminal equipment side is used as an example in the above-mentioned Figures 9a and 9b to introduce that the terminal equipment operates on multiple carriers through time division multiplexing. This solution can also be applied to the second terminal equipment side. For example, the second terminal device obtains the first indication information, the first indication information indicates one or more first time periods, and the second terminal device performs the operation on the first carrier and/or the second carrier in the one or more first time periods. Work.

In a possible implementation, the second terminal device obtains fifth indication information, and the fifth indication information indicates a or multiple third time periods. The second terminal device performs at least one of the following contents in one or more third time periods: the second terminal device monitors on the fifth carrier; or; the second terminal device transmits based on the sidelink on the fifth carrier. information. The fifth carrier is different from the first carrier, and the fifth carrier is different from the second carrier. In this way, the working time of the second terminal device is divided into one or more third time periods, and one third time period may include a continuous period of time. There may be a period of time between the two third time periods, that is, the two third time periods are not continuous. The second terminal equipment works on the fifth carrier during the third time period, and other times can be used for other work, thereby improving the flexibility of the working mode of the second terminal equipment.

In a possible implementation, any one of the one or more first time periods does not overlap with any one of the one or more third time periods. A third time period in this application can be the same as a second time period, and a third time period in this application can also be different from any second time period. This is not limited by the embodiment of this application. If the second terminal device does not support working on the fifth carrier and other carriers (such as the first carrier and the second carrier) simultaneously within the same time period, the second terminal device can work on the fifth carrier through time division multiplexing. and other carriers, thereby reducing the requirements on the capabilities of the second terminal equipment.

In a possible implementation, the second terminal device sends sixth indication information on the fifth carrier, and the sixth indication information is used to instruct the second terminal device to use the fifth carrier in one or more third time periods based on the side row. The link transmits the message. Since other terminal devices send messages to the second terminal device on the fifth carrier during the non-third time period, the second terminal device cannot receive them. Therefore, after the second terminal device sends the sixth indication information, it communicates with the second terminal device on the fifth carrier. The terminal device communicating with the device can also communicate with the second terminal device during the third time period, and do not communicate with the second terminal device on the fifth carrier during the non-third time period, thereby reducing the resources of other terminal devices. waste.

In the embodiment of the present application, this solution can also be used in combination with the foregoing solution. For example, the second terminal device can monitor on the second carrier during one or more first time periods; it can also be used on the second carrier. Monitoring is performed on the first carrier and the second carrier. For another example, the second terminal device monitors on the preset carrier in one or more first time periods. The default carrier is not the third carrier.

The solution of time division multiplexing on the second terminal device side working on multiple carriers is similar to the solution of time division multiplexing on the first terminal device side working on multiple carriers, and will not be described again.

According to the contents shown in Figure 1a, Figure 1b, Figure 1c, Figure 2a, Figure 2b, Figure 2c, Figure 2d and Figure 2e, Figure 10a exemplarily shows a side link-based method provided by an embodiment of the present application. Flowchart of signaling/data transmission method. In Figure 10a, the method is introduced by taking the method executed by the first terminal device and the second terminal device as an example. In the embodiment of the present application, the solution executed by the first terminal device side can also be executed by the unit, module or chip inside the first terminal device, and the solution executed by the second terminal device side can also be executed by the unit, module or chip inside the second terminal device. chip execution. The first terminal device and the second terminal device may be the two terminal devices in the aforementioned Figure 1a, Figure 1b or Figure 1c. The relevant content is similar to the relevant content in Figure 3 and will not be described again.

As shown in Figure 10a, the method includes:

Step 1001: The first terminal device sends a first request message to the fourth terminal device on the fourth carrier. The first request message requests signaling/data transmission on the second carrier and the third terminal device based on the sidelink.

Correspondingly, the fourth terminal device receives the first request message.

Step 1002: The first terminal device transmits signaling/data on the second carrier and the fourth terminal device based on the side link.

In the solution provided in Figure 10a, if the first terminal equipment determines that it needs to perform signaling/data transmission based on the sidelink on one or more carriers other than the fourth carrier (such as the second carrier), but it is still Based on sidelink on fourth carrier The link performs signaling/data transmission, and the first terminal device does not support signaling/data transmission based on the sidelink on the fourth carrier and other carriers (such as the second carrier) other than the fourth carrier at the same time, In this case, through the solution shown in Figure 10a, the first terminal device can migrate the sidelink-based signaling/data transmission with the fourth terminal device to the second carrier, thereby realizing the communication between the first terminal device and the fourth terminal device. The purpose of the sidelink-based signaling/data transmission of the fourth terminal equipment is not to be interrupted, and this solution can reduce the requirements on the capabilities of the first terminal equipment, thereby reducing the cost of the first terminal equipment.

It is worth noting that after the first terminal device sends the first request message, the fourth terminal device may refuse to migrate the sidelink-based signaling/data transmission of the first terminal device to the second carrier. This In this case, the first terminal device can interrupt communication with the fourth terminal device, or it can periodically operate on the fourth carrier and the second carrier through the time division multiplexing solution through the solution provided in Figure 9a. This achieves the purpose of uninterrupted signaling/data transmission based on the side link between the first terminal device and the fourth terminal device, and this solution can reduce the requirements on the capabilities of the first terminal device, thereby reducing the cost of the first terminal device. cost.

The solution shown in Figure 10a can also be used in conjunction with the methods provided in Figure 3, Figure 4a, Figure 4b, Figure 5a, Figure 5b, Figure 6a, Figure 7, and Figure 8. For example, the first terminal device can execute the above figure. 3. Before the solution on the first terminal device side of the methods provided in Figures 4a, 4b, 5a, 5b, 6a, 7, and 8, the first terminal device will migrate the communication of the fourth terminal device to the state where the work is about to begin. Other carriers besides the fourth carrier, such as the second carrier.

Figure 10b illustrates a possible schematic diagram of a working carrier of the first terminal device. As shown in Figure 10b, the first terminal device first communicates with the fourth terminal device based on the side link on the fourth carrier. After that, the first terminal device migrates the communication with the fourth terminal device to the second carrier. The first terminal device communicates with the fourth terminal device on the second carrier based on the side link, and can also communicate with other terminal devices based on the second carrier. The carriers (which may also include other carriers except the fourth carrier) communicate based on sidelinks.

It should be noted that in the embodiment of the present application, when a certain network element (for example, network element A) receives information from another network element (for example, network element B), it may mean that network element A directly receives information from network element B. Receiving information may also refer to network element A receiving information from network element B via other network elements (for example, network element C). When network element A receives information from network element B via network element C, network element C can transparently transmit the information or process the information, for example, carry the information in different messages for transmission or filter the information. , and only sends the filtered information to network element A. Similarly, in various embodiments of the present application, when network element A sends information to network element B, it may mean that network element A sends information directly to network element B, or it may mean that network element A sends information to network element B via other network elements (for example, network C). element) sends information to network element B.

The terms "system" and "network" in the embodiments of this application may be used interchangeably. "At least one" means one or more, and "plurality" means two or more. "And/or" describes the association of associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the related objects are in an "or" relationship. For example, "signaling/data" appearing in the embodiment of this application refers to signaling or data. "At least one of the following" or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items). For example, at least one of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple .

And, unless otherwise specified, the ordinal numbers such as "first" and "second" mentioned in the embodiments of this application are used to distinguish multiple objects and are not used to limit the order, timing, priority or importance of multiple objects. degree.

It should be noted that the names of the above messages are only examples. With the evolution of communication technology, any of the above Any message may change its name, but no matter how its name changes, as long as its meaning is the same as the meaning of the above message in this application, it will fall within the protection scope of this application.

According to the foregoing method, Figure 11 is a schematic structural diagram of a device provided by an embodiment of the present application. As shown in Figure 11, the communication device can be a first terminal device or a second terminal device, or it can be a chip or a circuit. For example, it can be disposed on The chip or circuit of the first terminal device may be another example of a chip or circuit that may be disposed in the second terminal device. The communication device can be used to perform any one of the above-mentioned Figure 3, Figure 4a, Figure 4b, Figure 5a, Figure 5b, Figure 6a, Figure 6b, Figure 7, Figure 8, Figure 9a, Figure 9b, Figure 10a or Figure 10b The method on the first terminal device side or the second terminal device side in the related solution.

The communication device 1801 includes a processor 1802 and a transceiver 1803.

Further, the communication device 1801 may include a memory 1804. The dotted line on the memory 1804 in the figure further indicates that the memory is optional.

Optionally, the communication device 1801 may further include a bus system, wherein the processor 1802, the memory 1804, and the transceiver 1803 may be connected through the bus system.

It should be understood that the above-mentioned processor 1802 may be a chip. For example, the processor 1802 can be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), or It can be a central processing unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller unit, MCU), or a programmable logic device (PLD) or other integrated chip.

During the implementation process, each step of the above method can be completed by instructions in the form of hardware integrated logic circuits or software in the processor 1802 . The steps of the methods disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware processor, or executed by a combination of hardware and software modules in the processor 1802. The software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field. The storage medium is located in the memory 1804. The processor 1802 reads the information in the memory 1804 and completes the steps of the above method in combination with its hardware.

It should be noted that the processor 1802 in the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. During the implementation process, each step of the above method embodiment can be completed through an integrated logic circuit of hardware in the processor or instructions in the form of software. The above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. . Each method, step and logical block diagram disclosed in the embodiment of this application can be implemented or executed. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory 1804 in the embodiment of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. For relevant descriptions of the memory in the embodiments of the present application, please refer to the foregoing content and will not be described again here.

When the communication device 1801 is the above-mentioned first terminal device, the processor 1802 is configured to execute through the transceiver 1803: The first message is sent on the first carrier; the second message is sent on the second carrier; the second carrier is a carrier determined by the first terminal device to be different from the first carrier; where both the first message and the second message are used for discovery other terminal equipment; or, both the first message and the second message are used to request to establish a link with the second terminal equipment.

When the communication device 1801 is the above-mentioned first terminal device, in a possible implementation, the processor 1802 is also configured to perform through the transceiver 1803: monitor on the first carrier; send the second message on the second carrier, It includes: sending a second message on the second carrier when no message responding to the first message is received on the first carrier within a preset first time period.

When the communication device 1801 is the above-mentioned first terminal device, in a possible implementation, the processor 1802 is further configured to: receive the third message from the second terminal device on the second carrier through the transceiver 1803; Signaling/data transmission is performed on the carrier with the second terminal device based on the sidelink.

When the communication device 1801 is the above-mentioned first terminal device, in a possible implementation, the processor 1802 is also configured to determine the first association relationship.

When the communication device 1801 is the above-mentioned first terminal device, in a possible implementation, the processor 1802 is also configured to use the transceiver 1803: when the first association relationship indicates that the first destination identifier is associated with the second carrier, According to the destination identifier of the fourth message and the first association relationship, if the destination identifier of the fourth message includes the layer 2 identifier of the second terminal device, the fourth message is sent on the second carrier.

When the communication device 1801 is the above-mentioned first terminal device, in a possible implementation, the processor 1802 is also configured to use the transceiver 1803 to: indicate the first source identifier, the first destination identifier and the second carrier in the first association relationship In the case of association, according to the destination identifier of the fourth message, the source identifier of the fourth message and the first association relationship, the destination identifier of the fourth message includes the layer 2 identifier of the second terminal device, and the source identifier of the fourth message includes the layer 2 identifier of the second terminal device. In the case of a layer 2 identification of a terminal device, the fourth message is sent on the second carrier.

When the communication device 1801 is the above-mentioned first terminal device, in a possible implementation, the processor 1802 is also configured to obtain first indication information through the transceiver 1803, and the first indication information indicates one or more first time periods. ;Sending the first message on the first carrier and the second message on the second carrier in one or more first time periods.

When the communication device 1801 is the above-mentioned first terminal device, in a possible implementation, the processor 1802 is also configured to obtain second indication information through the transceiver 1803, and the second indication information indicates one or more second time periods. . Perform at least one of the following during one or more second time periods: listen on a third carrier; the third carrier is different from the first carrier, or the third carrier is different from the second carrier; or; The carrier transmits messages based on sidelinks.

When the communication device 1801 is the above-mentioned first terminal device, in a possible implementation, the processor 1802 is also configured to send the first request message to the fourth terminal device on the fourth carrier through the transceiver 1803. The first request message Request signaling/data transmission on the second carrier and the fourth terminal device based on the sidelink.

When the communication device 1801 is the above-mentioned second terminal device, the processor 1802 is configured to execute through the transceiver 1803: monitor on the first carrier, monitor on the second carrier; receive the third signal on the first carrier based on the sidelink. A message; a second message is received on a second carrier based on the sidelink. The second carrier is different from the first carrier; both the first message and the second message are used to discover other terminal equipment, or the first message and the second message are both used to request to establish a link with the second terminal equipment; from the first carrier and The second carrier is determined to be a carrier for signaling/data transmission between the second terminal equipment and the first terminal equipment based on the sidelink.

When the communication device 1801 is the above-mentioned second terminal device, in a possible implementation, the processor 1802 is also used to determine the second association relationship.

The communication device involves concepts, explanations and detailed descriptions related to the technical solutions provided by the embodiments of the present application and For other steps, please refer to the descriptions of these contents in the foregoing methods or other embodiments, and will not be described again here.

According to the foregoing method, Figure 12 is a schematic structural diagram of a device provided by an embodiment of the present application. As shown in Figure 12, a communication device 1901 may include a communication interface 1903 and a processor 1902. Further, the communication device 1901 may include a memory 1904. The dotted line on memory 1904 in the figure further indicates that the memory is optional. The communication interface 1903 is used to input and/or output information; the processor 1902 is used to execute computer programs or instructions, so that the communication device 1901 implements the above-mentioned Figure 3, Figure 4a, Figure 4b, Figure 5a, Figure 5b, Figure 6a, Figure 6b, the method on the first terminal device side in any of the related solutions in Figure 7, Figure 8, Figure 9a, Figure 9b, Figure 10a or Figure 10b, or causing the communication device 1901 to implement the above Figure 3, Figure 4a, Figure 4b , the method on the second terminal device side in any one of the related solutions of Figure 5a, Figure 5b, Figure 6a, Figure 6b, Figure 7, Figure 8, Figure 9a, Figure 9b, Figure 10a or Figure 10b. In the embodiment of the present application, the communication interface 1903 can implement the solution implemented by the transceiver 1803 of Figure 11, the processor 1902 can implement the solution implemented by the processor 1802 of Figure 11, and the memory 1904 can implement the memory 1804 of Figure 11. The implemented solution will not be described again here.

Based on the above embodiments and the same concept, Figure 13 is a schematic diagram of a device provided by an embodiment of the present application. As shown in Figure 13, the communication device 2001 can be a first terminal device or a second terminal device, or it can be a chip or a circuit. For example, it can be provided in a chip or circuit of the first terminal device or the second terminal device.

The communication device 2001 includes a processing unit 2002 and a communication unit 2003. Further, the communication device 2001 may or may not include the storage unit 2004. The memory unit 2004 in the figure is dotted to further indicate that the memory is optional.

The communication unit 2003 is used to input and/or output information; the processing unit 2002 is used to execute computer programs or instructions, so that the communication device 2001 implements the above-mentioned Figure 3, Figure 4a, Figure 4b, Figure 5a, Figure 5b, Figure 6a, Figure 6b, the method on the first terminal device side in any of the related solutions in Figure 7, Figure 8, Figure 9a, Figure 9b, Figure 10a or Figure 10b, or causing the communication device 2001 to implement the above Figure 3, Figure 4a, Figure 4b , the method on the second terminal device side in any one of the related solutions of Figure 5a, Figure 5b, Figure 6a, Figure 6b, Figure 7, Figure 8, Figure 9a, Figure 9b, Figure 10a or Figure 10b. In the embodiment of the present application, the communication unit 2003 can implement the solution implemented by the transceiver 1803 of Figure 11, the processing unit 2002 can implement the solution implemented by the processor 1802 of Figure 11, and the storage unit 2004 can implement the memory of Figure 11. The solution implemented by 1804 will not be described again here.

According to the method provided by the embodiment of the present application, the present application also provides a computer program product. The computer program product includes: computer program code or instructions. When the computer program code or instructions are run on a computer, the computer causes the computer to execute Figure 3 , any one of the embodiments shown in any one of Figure 4a, Figure 4b, Figure 5a, Figure 5b, Figure 6a, Figure 6b, Figure 7, Figure 8, Figure 9a, Figure 9b, Figure 10a or Figure 10b method.

According to the method provided by the embodiment of the present application, the present application also provides a computer-readable storage medium. The computer-readable medium stores program code. When the program code is run on a computer, it causes the computer to execute Figures 3 and 4a. , the method of any one of the embodiments shown in any one of Figure 4b, Figure 5a, Figure 5b, Figure 6a, Figure 6b, Figure 7, Figure 8, Figure 9a, Figure 9b, Figure 10a or Figure 10b.

According to the method provided by the embodiment of the present application, the present application also provides a chip system, and the chip system may include a processor. The processor is coupled to the memory and can be used to execute any of Figure 3, Figure 4a, Figure 4b, Figure 5a, Figure 5b, Figure 6a, Figure 6b, Figure 7, Figure 8, Figure 9a, Figure 9b, Figure 10a or Figure 10b A method of any one of the illustrated embodiments. Optionally, the chip system also includes a memory. Memory is used to store computer programs (also called codes, or instructions). The processor is used to call and run the computer program from the memory, so that the device equipped with the chip system executes Figure 3, Figure 4a, Figure 4b, Figure 5a, Figure 5b, Figure 6a, Figure 6b, Figure 7, Figure 8, Figure 9a , Figure 9b, Figure 10a Or the method of any one of the embodiments shown in any one of Figure 10b.

According to the method provided by the embodiment of the present application, the present application also provides a system, which includes the aforementioned one or more first terminal devices and one or more second terminal devices, and may also include a third terminal device.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. A computer program product includes one or more computer instructions. When computer instructions are loaded and executed on a computer, processes or functions according to embodiments of the present application are generated in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g., computer instructions may be transmitted from a website, computer, server or data center via a wired link (e.g. Coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means to transmit to another website, computer, server or data center. Computer-readable storage media can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or other integrated media that contains one or more available media. Available media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., high-density digital video discs (DVD)), or semiconductor media (e.g., solid state disks (SSD) )wait.

It should be noted that part of this patent application document contains content protected by copyright. The copyright owner retains copyright except in making copies of the contents of the patent document or records in the Patent Office.

The communication device in each of the above device embodiments corresponds to the first terminal device or the second terminal device in the method embodiment, and the corresponding module or unit performs the corresponding steps. For example, the communication unit (transceiver) performs the reception or the second terminal device in the method embodiment. The sending step, other steps except sending and receiving, may be executed by the processing unit (processor). For the functions of specific units, please refer to the corresponding method embodiments. There can be one or more processors.

The terms "component", "module", "system", etc. used in this specification are used to refer to computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process, a processor, an object, an executable file, a thread of execution, a program and/or a computer running on a processor. Through the illustrations, both applications running on the computing device and the computing device may be components. One or more components can reside in a process and/or thread of execution and a component can be localized on one computer and/or distributed between two or more computers. Additionally, these components can execute from various computer-readable media having various data structures stored thereon. A component may, for example, be based on a signal having one or more data packets (eg, data from two components interacting with another component, a local system, a distributed system, and/or a network, such as the Internet, which interacts with other systems via signals) Communicate through local and/or remote processes.

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or a combination of computer software and electronic hardware. accomplish. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be described again here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components may be The combination can either be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

A unit described as a separate component may or may not be physically separate. A component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit. Functions may be stored in a computer-readable storage medium when implemented in the form of software functional units and sold or used as independent products.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, and all of them should be covered. within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A sidelink-based communication method, characterized by including:

The first terminal device sends the first message on the first carrier;

The first terminal device sends the second message on a second carrier; the second carrier is a carrier determined by the first terminal device that is different from the first carrier;

Wherein, the first message and the second message are both used to discover other terminal devices; or the first message and the second message are both used to request to establish a link with a second terminal device.
The method of claim 1, wherein the destination identifier corresponding to the second message is the same as the destination identifier corresponding to the first message.
The method according to claim 1 or 2, characterized in that the protocol data unit PDU containing the first message is the same as the PDU containing the second message.
The method according to claim 1 or 2, characterized in that,

The method also includes:

The first terminal device monitors on the first carrier;

The first terminal device sends a second message on the second carrier, including:

If a message responding to the first message is not received on the first carrier within a preset first time period, the first terminal device sends the second message on the second carrier.
The method according to any one of claims 1 to 4, characterized in that the first message includes indication information of the first service, and the second message includes indication information of the first service;

The first carrier and the second carrier support transmission of data of the first service.
The method according to any one of claims 1 to 5, characterized in that, after the first terminal device sends the second message on the second carrier, it further includes:

The first terminal device receives a third message from the second terminal device on the second carrier;

The first terminal device performs sidelink communication with the second terminal device on the second carrier.
The method of claim 6, wherein the source identifier corresponding to the third message includes the layer 2 identifier of the second terminal device;

After the first terminal device receives the third message from the second terminal device on the second carrier, the method further includes:

The first terminal device determines a first association relationship;

Wherein, the first association relationship indicates that the first destination identifier is associated with the second carrier; or the first association relationship indicates that the first source identifier, the first destination identifier are associated with the second carrier;

The first destination identifier includes the layer 2 identifier of the second terminal device, and the first source identifier includes the layer 2 identifier of the first terminal device.
The method of claim 7, wherein the first terminal device performs sidelink communication with the second terminal device on the second carrier, including:

In the case where the first association relationship indicates that the first destination identifier is associated with the second carrier, the first terminal device, according to the destination identifier corresponding to the fourth message and the first association relationship, in the fourth If the destination identifier corresponding to the message includes the Layer 2 identifier of the second terminal device, send the fourth message on the second carrier;

or;

In the case where the first association relationship indicates that the first source identifier and the first destination identifier are associated with the second carrier, the first terminal device uses the destination identifier corresponding to the fourth message, the fourth message The corresponding source identifier and the first association relationship, the destination identifier corresponding to the fourth message includes the layer 2 identifier of the second terminal device, and the source identifier corresponding to the fourth message includes the first terminal device In the case of a layer 2 identifier, the fourth message is sent on the second carrier.
The method according to any one of claims 1-8, characterized in that,

The first terminal device sends the first message on the first carrier, and before the first terminal device sends the second message on the second carrier, the method further includes:

The first terminal device obtains first indication information, and the first indication information indicates one or more first time periods;

The first terminal device sends the first message on the first carrier, and the first terminal device sends the second message on the second carrier, including:

The first terminal device sends the first message on the first carrier and the second message on the second carrier in one or more of the first time periods.
The method of claim 9, further comprising:

The first terminal device obtains second indication information, and the second indication information indicates one or more second time periods;

The first terminal device performs at least one of the following contents in one or more of the second time periods:

The first terminal device monitors on a third carrier; the third carrier is different from the first carrier, or the third carrier is different from the second carrier;

or;

The first terminal device transmits a message based on a sidelink on the third carrier.
A sidelink-based communication method, characterized by including:

The second terminal device monitors on the first carrier, and the second terminal device monitors on the second carrier;

The second terminal device receives the first message on the first carrier based on the sidelink;

The second terminal device receives a second message on the second carrier based on a sidelink; the second carrier is different from the first carrier; both the first message and the second message are used for Discover other terminal devices, or both the first message and the second message are used to request to establish a link with the second terminal device;

The second terminal device determines a carrier for sidelink communication between the second terminal device and the first terminal device from the first carrier and the second carrier.
The method of claim 11, wherein the second terminal device determines from the first carrier and the second carrier that the second terminal device performs a side link with the first terminal device. After using the carrier for communication, the method further includes:

The second terminal device determines a second association relationship;

Wherein, the second association relationship indicates that the second destination identifier is associated with the second carrier; or the second association relationship indicates that the second source identifier and the second destination identifier are associated with the second carrier;

The second carrier is the carrier determined by the second terminal device for sidelink communication between the second terminal device and the first terminal device;

The second destination identifier includes the layer 2 identifier of the first terminal device, and the second source identifier includes the layer 2 identifier of the second terminal device.
A side link communication device, characterized in that it includes a processing unit and a communication unit, the processing unit is used to:

sending the first message on the first carrier;

Send the second message on a second carrier; the second carrier is a carrier determined by the first terminal device that is different from the first carrier;

Wherein, the first message and the second message are both used to discover other terminal devices; or the first message and the second message are both used to request to establish a link with a second terminal device.
The device of claim 13, wherein the destination identifier corresponding to the second message is the same as the destination identifier corresponding to the first message.
The device according to claim 13 or 14, characterized in that the protocol data unit PDU containing the first message is the same as the PDU containing the second message.
The device according to claim 13 or 14, characterized in that,

The processing unit is also configured to monitor on the first carrier through the communication unit;

If a message responding to the first message is not received on the first carrier within a preset first time period, the second message is sent on the second carrier.
The device according to any one of claims 13 to 16, wherein the first message includes indication information of the first service, and the second message includes indication information of the first service;

The first carrier and the second carrier support transmission of data of the first service.
The apparatus according to any one of claims 13 to 17, wherein the processing unit is further configured to receive a third message from the second terminal device on the second carrier through the communication unit;

Sidelink communications are performed with the second terminal device on the second carrier.
The apparatus of claim 18, wherein the source identifier corresponding to the third message includes the layer 2 identifier of the second terminal device;

The processing unit is also used to:

Determine the first association relationship;

Wherein, the first association relationship indicates that the first destination identifier is associated with the second carrier; or the first association relationship indicates that the first source identifier, the first destination identifier are associated with the second carrier;

The first destination identifier includes the layer 2 identifier of the second terminal device, and the first source identifier includes the layer 2 identifier of the first terminal device.
The device of claim 19, wherein the processing unit is further configured to: through the communication unit:

In the case where the first association relationship indicates that the first destination identifier is associated with the second carrier, according to the destination identifier corresponding to the fourth message and the first association relationship, the destination identifier corresponding to the fourth message includes In the case of the Layer 2 identification of the second terminal device, send the fourth message on the second carrier;

or;

In the case where the first association relationship indicates that the first source identifier and the first destination identifier are associated with the second carrier, according to the destination identifier corresponding to the fourth message, the source identifier corresponding to the fourth message and the In the first association relationship, when the destination identifier corresponding to the fourth message includes the Layer 2 identifier of the second terminal device, and the source identifier corresponding to the fourth message includes the Layer 2 identifier of the first terminal device, The fourth message is sent on the second carrier.
The device according to any one of claims 13 to 20, characterized in that the processing unit is also configured to: through the communication unit:

Obtain first indication information, the first indication information indicating one or more first time periods;

The first message is sent on the first carrier and the second message is sent on the second carrier during one or more of the first time periods.
The device of claim 21, wherein the processing unit is further configured to:

Obtain second indication information, the second indication information indicating one or more second time periods;

Perform at least one of the following during one or more of the second time periods:

Monitoring is performed on a third carrier; the third carrier is different from the first carrier, or the third carrier is different from the second carrier;

or;

Messages are transmitted on the third carrier based on sidelinks.
A side link communication device, characterized in that it includes a processing unit and a communication unit, the processing unit is used to:

Monitor on the first carrier and monitor on the second carrier;

receiving a first message on the first carrier based on a sidelink;

A second message is received on the second carrier based on a sidelink; the second carrier is different from the first carrier; both the first message and the second message are used to discover other terminal devices, or The first message and the second message are both used to request the establishment of a link with the second terminal device;

A carrier for sidelink communication between the second terminal device and the first terminal device is determined from the first carrier and the second carrier.
The device according to claim 23, characterized in that the processing unit is also used to:

Determine the second association relationship;

Wherein, the second association relationship indicates that the second destination identifier is associated with the second carrier; or the second association relationship indicates that the second source identifier and the second destination identifier are associated with the second carrier;

The second carrier is the carrier determined by the second terminal device for sidelink communication between the second terminal device and the first terminal device;

The second destination identifier includes the layer 2 identifier of the first terminal device, and the second source identifier includes the layer 2 identifier of the second terminal device.
A communication device, characterized by including a processor and a memory,

The memory is used to store computer programs or instructions;

The processor is configured to execute computer programs or instructions in the memory, so that the method described in any one of claims 1-10 is executed, or the method described in any one of claims 11-12 is executed.
A communication device, characterized by comprising a processing module and a communication module, the processing module being configured to perform the method as claimed in any one of claims 1-10 through the communication module, or to perform the method as claimed in claim 11- The method described in any one of 12.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer-executable instructions, and when called by a computer, the computer-executable instructions cause the method described in any one of claims 1-10. The method is executed, or the method described in any one of claims 11-12 is executed.
A chip system, characterized by including a communication interface and a processor:

The communication interface is used to input and/or output signaling or data;

The processor is configured to execute a computer executable program, so that the device installed with the chip system performs the method described in any one of claims 1-10, or performs the method described in any one of claims 11-12. Methods.