CN116939507A

CN116939507A - Communication method, device, storage medium and chip system based on side link

Info

Publication number: CN116939507A
Application number: CN202210344832.XA
Authority: CN
Inventors: 才宇; 徐海博; 薛丽霞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2023-10-24
Also published as: WO2023185956A1

Abstract

A communication method, a device, a storage medium and a chip system based on a side link relate to the technical field of wireless communication and are used for improving the service processing capacity of the side link. In the application, the first terminal equipment sends the first message on the first carrier wave and sends the second message on the second carrier wave. The second carrier is a carrier determined by the first terminal device that 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 the second terminal device. Since the side link between the first terminal device and the second terminal device is configured with at least two carriers, more side link traffic can be handled through at least two carriers, so that the traffic throughput of the side link can be improved. And because the first terminal equipment sends the message on at least two carriers, the probability of other terminal equipment successfully receiving the message from the first terminal equipment can be improved.

Description

Communication method, device, storage medium and chip system based on side link

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a side-uplink based communication method, apparatus, storage medium, and chip system.

Background

In a wireless communication system, data communication may be performed between terminal apparatuses via a network, or communication between terminal apparatuses may be performed directly without using a network apparatus, for example, communication between two terminal apparatuses may be performed directly via a PC5 interface. The communication between terminal devices may be referred to as Sidelink (SL). The side-links support unicast, multicast, broadcast communications.

In the third generation partnership project long term evolution (3rd Generation Partnership Project,3GPP) Release 16, the first version of the wireless (NR) side uplink internet of vehicles (vehicle to everything, V2X) is standardized in the fifth generation mobile network (the 5th generation,5G) subject, which is focused on supporting V2X-related road safety services. In Rel-17, the system business team (System Aspects workgroup, sa 2) has studied and standardized short-range services (Proximity based service, proSe), including public safety and business related services.

In Release 16NR sidelink, a carrier for the sidelink is configured for a terminal device, on which all terminal devices communicating based on the sidelink transmit signaling/data and monitor.

Not only can the side-link be applied to V2X, but the industry is increasingly interested in extending the side-link to other areas, such as business. With the increase of the application scenarios of the side links, the traffic volume of the side links also increases, and how to improve the traffic volume of the side links is called a problem that needs to be solved currently.

Disclosure of Invention

The embodiment of the application provides a communication method, a device, a storage medium and a chip system based on a side link, which are used for configuring at least two carriers for terminal equipment which is used for communication based on the side link, and then more side link services can be processed through the at least two carriers, so that the service processing capacity of the side link can be improved.

In a first aspect, the present application provides a method of side-link based communication, which may be performed by a terminal device or a unit, module or chip within the terminal device, where the method provided in the first aspect is performed by the first terminal device as an example. The method comprises the following steps:

The first terminal device transmits a first message on a first carrier and a 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. 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 the second terminal device.

Since at least two carriers are configured for the side links between the first terminal device and the second terminal device, more side link traffic can be processed through the at least two carriers, and thus the traffic throughput of the side links can be improved.

On the other hand, in the case of configuring at least two carriers for the side uplink between the first terminal device and the second terminal device, if the first terminal device randomly selects one carrier for sending the message, and the other terminal devices (such as the second terminal device) randomly select one carrier for monitoring, the probability of the other terminal devices successfully receiving the message from the first terminal device is lower. For example, the first terminal device randomly selects a first carrier and sends a message on the first carrier; the second terminal device randomly selects the second carrier and monitors on the second carrier, in which case the second terminal device cannot successfully receive the message sent by the first terminal device, and a link cannot be established between the first terminal device and the second terminal device.

In the application, the first terminal equipment can send the message on at least two carriers (such as sending the first message on the first carrier and sending the second message on the second carrier), so that the probability that other terminal equipment successfully receives the message from the first terminal equipment can be improved, and then the probability that the first terminal equipment and other terminal equipment successfully establish a link can be improved.

The second terminal device of the present application may include at least one other terminal device than the first terminal device.

In one possible embodiment, the second terminal device comprises terminal device one, in which case the first message and the second message may both be used to request establishment of a link with terminal device one. The first message and the second message may both be unicast messages.

In a further possible embodiment, the second terminal device may comprise a plurality of terminal devices, for example, terminal device two and terminal device three. The seventh indication information is used for indicating the second terminal equipment and the third terminal equipment. In this case, the first message and the second message may each be used to request establishment of a link with the terminal device indicated by the seventh indication information. In this case, the first message and the second message may both be multicast messages, e.g., the first message and the second message may both be broadcast messages.

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

Thus, when the first message and the second message are unicast messages, the first message and the second message are messages sent to the same terminal device. Since the first terminal device transmits 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.

Thus, when the first message and the second message are multicast messages, the destination identifiers of the first message and the second message are the same, which means that the first message and the second message are messages sent to the same group of terminal devices (at least two terminal devices). 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.

The first message in the present application may be processed to obtain a PDU containing the first message, for example, the PDCP layer may be processed to obtain a PDCP PDU containing the first message. In one possible implementation, the PDU containing the first message is identical to the PDU containing the second message. It may also be understood that the content corresponding to the first message in the PDCP layer is the same as the content corresponding to the second message in the PDCP layer, and since the first terminal device sends at least two identical PDUs in at least two carriers, the probability of receiving the PDUs by the receiving device may be increased, and thus the probability of successfully receiving the messages from the first terminal device by the terminal devices in the group of terminal devices may be increased.

In one possible embodiment, the first terminal device generates a first message, and further generates a plurality of PDUs including the first message. The first terminal equipment sends one part of the PDU on a first carrier wave, and sends another part of the PDU on a second carrier wave; wherein the PDU including the second message is the above-mentioned another PDU. In this way, the first terminal device generates the first message at a higher layer (such AS a V2X layer, a ProSe layer, a PC5 signaling protocol layer, or a higher layer of an AS layer), that is, an effect of transmitting at least two PDUs at least two carriers can be achieved, so that the number of messages generated at the higher layer of the first terminal device can be reduced, and then the workload of the higher layer can be reduced.

In one possible embodiment, the message sequence number of the first message is identical to the message sequence number of the second message. To introduce the beneficial effects of this solution, the following are given by way of example:

the first terminal device generates a first message and transmits the first message through the first carrier. And if the first terminal equipment determines that the message needs to be retransmitted, regenerating a message II and transmitting the message II through a carrier I.

As can be seen from the above examples, the first terminal device will only send once for message one, and in case a retransmission is required, the higher layer of the first terminal device will regenerate a new message two for retransmission. That is, the second message for retransmission is newly generated and not the original first message, but the original first message is stored only in the buffer of the first terminal device and has been sent out, and then the first terminal device can only regenerate the second message for transmission, and cannot send the first message twice. In this example, since message two is a newly generated message at a higher layer, the message sequence number of message two is different from the message sequence number of message one.

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

In one possible embodiment, the first terminal device transmits the first message on the first carrier, and after the first terminal device transmits the second message on the second carrier, the first terminal device listens on the first carrier and the second carrier.

Since the first terminal device sends the message on at least two carriers, other terminal devices may return the response message on any one or more of the at least two carriers, and the first terminal device monitors on the at least two carriers, so that the probability that the first terminal device successfully receives the response message from other terminal devices can be improved.

In one possible embodiment, the method further comprises: the first terminal device listens on the first carrier after the first carrier transmits the first message. And under the condition that the message responding to the first message is not received on the first carrier wave within the preset first time period, the first terminal equipment sends a second message on the second carrier wave.

In this scheme, after the first terminal device sends the first message on the first carrier, if the first terminal device does not receive the message responding to the first message on the first carrier, the first terminal device may determine a carrier different from the first carrier, for example, the second carrier, and then send the second message on the second carrier. It can be seen that the first terminal device sends a plurality of messages on at least two carriers in turn, which on the one hand can increase the probability that other terminal devices receive the messages from the first terminal device. On the other hand, since the first terminal device transmits the second message on the second carrier only when the first carrier does not receive the message in response to the first message, the second message may not be transmitted when the first carrier receives the message in response to the first message, and thus the number of messages transmitted by the first terminal device can be saved.

In one possible implementation manner, 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 sends the second message on the second carrier if the destination identifier corresponding to the second message is the same as the destination identifier corresponding to the first message.

In the application, after a higher layer (such AS a V2X layer, a ProSe layer, a PC5 signaling protocol layer, or a higher layer of an AS layer) of a first terminal device generates a second message, other layers below the higher layer (such AS the V2X layer, the ProSe layer, the PC5 signaling protocol layer, or the higher layer of the AS layer) of the first terminal device receive the second message, and when the second message is sent, a carrier for sending the second message may be determined according to a destination identifier corresponding to the second message, and when the destination identifier corresponding to the second message is the same AS the destination identifier corresponding to the first message, the first terminal device needs to select a carrier different from the first carrier for sending the first message to send the second message. In this way, the purpose that the first terminal device sends the message through at least two carriers can be achieved, and then the probability that other terminal devices receive the message from the first terminal device can be improved.

In another possible implementation manner, when the destination identifier corresponding to the message received by the other layer 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 the first carrier adopted when sending the first message when selecting the carrier for the message, and the first terminal device can select the first carrier when selecting the carrier for the message, and can also select other carriers.

In one possible embodiment, the first terminal device listens on the second carrier after the first terminal device transmits the second message on the second carrier.

Because the first terminal equipment sends the message on at least two carriers in turn, the message can be sent on one carrier at a time and monitored on one carrier, the requirement on the capability of the first terminal equipment can be reduced, namely, the terminal equipment with low capability can use the scheme provided by the embodiment of the application.

In one possible embodiment, 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 for the first service.

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

In one possible embodiment, after the first terminal device transmits the second message on the second carrier, the first terminal device receives a third message from the second terminal device on the second carrier. The first terminal device performs side-link 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, and the subsequent first terminal device can send messages to the second terminal device on the second carrier without sending multiple messages to the second terminal device on multiple carriers, so that the number of messages sent by the first terminal device can be reduced.

In a second aspect, the present application provides a method of side-link based communication, which may be performed by a terminal device or a unit, module or chip within the terminal device, where the method provided in the second aspect is performed by a second terminal device. The method comprises the following steps:

the second terminal device receives the first message on the first carrier based on the side-link and/or the second terminal device receives the second message on the second carrier based on the side-link.

Wherein the second carrier 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 the second terminal device.

Since at least two carriers are configured for the side link between the first terminal device and the second terminal device, more side link traffic can be processed through the at least two carriers, and thus the traffic throughput of the side link can be improved.

The second terminal device of the present application can monitor on one carrier, and can monitor on at least two configured carriers supporting side uplinks. In the case where the second terminal device listens to at least two carriers, it is possible that a message is received on at least two carriers (such as the first carrier and the second carrier), and that a plurality of messages (such as the first message and the second message) are received on at least two carriers.

In one possible implementation, the second terminal receives the first message on the first carrier based on the side-link, and the second terminal determines a carrier for the second terminal to perform side-link communication with the first terminal from the first carrier and the second carrier, if the second terminal receives the second message on the second carrier based on the side-link.

After determining that 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 the second terminal device, the second terminal device can select one carrier from at least two carriers receiving a plurality of messages as a carrier for subsequent communication with the first terminal device, so that the second terminal device can return a response message to the first terminal device on the selected carrier, and the messages received on other non-selected carriers can be discarded without processing. Compared with one possible scheme: the second terminal equipment returns a message responding to the first message on the first carrier, and the second terminal equipment returns a message responding to the second message on the second carrier. In the scheme provided by the application, the second terminal equipment does not need to respond to the first message and the second message respectively, so that the number of messages sent by the second terminal equipment can be reduced.

In one possible implementation, the second terminal receives the first message on the first carrier based on the side-link. 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 side uplink, and after determining that the received second message and the received first message are both used for discovering other terminal devices or are both used for requesting to establish a link with the second terminal device, the second terminal device can discard the second message, so that the number of messages required to be processed by the second terminal device can be reduced.

In yet another possible implementation, the second terminal receives the first message on the first carrier based on the side-link. The second terminal device returns a message responding to the first message to the first terminal device on the first carrier. And then, the second terminal equipment receives the second message on the second carrier based on the side uplink, and when the second terminal equipment determines that the PDU corresponding to the second message is the same as the PDU corresponding to the first message, the second message can be discarded, so that the number of messages required to be processed by the second terminal equipment can be reduced.

In a possible embodiment, 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 may communicate with the first terminal device based on the first carrier, and then continue to receive the second message, where it is determined that the source identifier corresponding to the second message is the same as the source identifier corresponding to the first message, the second message may be discarded, so that the number of messages that needs to be processed by the second terminal device may be reduced.

In one possible embodiment, the second terminal device may monitor on the first carrier and the second carrier simultaneously, or may monitor on 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 if a message for discovering other terminal devices or requesting to establish a link with the second terminal device is not received within the preset second duration, the second terminal device monitors the second carrier.

It can be seen that if the second terminal device does not have the capability of simultaneously performing interception on the first carrier and the second carrier, a manner of alternatively performing interception on the first carrier and the second carrier may be adopted, and the manner may reduce the capability requirement on the second terminal device.

Further, if the second terminal device receives a message, such as the second message, for discovering other terminal devices or requesting to establish a link with the second terminal device, in the preset duration, the second terminal device may not monitor on the other carriers.

The relevant description and the beneficial effects can be referred to the relevant description of the first aspect, and are not repeated.

In one possible embodiment, if the second terminal device receives the second message on the second carrier, the second terminal device may send a third message to the first terminal device on the second carrier. The second terminal device may determine the second carrier to be the carrier used for side-link communication with the first terminal device.

In a third aspect, the present application provides a method of side-link based communication, which may be performed by a terminal device or a unit, module or chip within the terminal device, where the method provided in the third aspect is performed by a first terminal device as an example. The method comprises the following steps:

the first terminal equipment determines a preset carrier wave, and sends a first message on the preset carrier wave. The first message is used for discovering other terminal equipment; or, the first message is used for requesting to establish a link with the second terminal device. The preset carrier is a carrier of at least two carriers of a side-link configuration between the first terminal device and the second terminal device.

On the other hand, because the application is provided with the preset carrier, the first terminal equipment can send the first message on the preset carrier, and other terminal equipment can monitor on the preset carrier, so that the probability that the other terminal equipment successfully receives the message from the first terminal equipment can be improved, and the probability that the first terminal equipment and the other terminal equipment successfully establish a link can be improved.

In a fourth aspect, the present application provides a method of side-link based communication, which may be performed by a terminal device or a unit, module or chip within a terminal device, where the method provided in the fourth aspect is performed by a second terminal device. The method comprises the following steps:

the second terminal equipment determines a preset carrier wave, and monitors the preset carrier wave. The second terminal equipment receives the first message from the first terminal equipment at a preset carrier. The first message is used for discovering other terminal equipment; or the first message is used to request a link to be established with the second terminal device. The preset carrier is a carrier of at least two carriers supported by the side uplink.

On the other hand, since the preset carrier is set in the present application, the second terminal device can monitor on the preset carrier. Other terminal devices may send messages on the preset carrier, so that the probability of the second terminal device successfully receiving the messages from the other terminal devices can be improved, and then the probability of the second terminal device successfully establishing links with the other terminal devices can be improved.

In a fifth aspect, an embodiment of the present application provides a method for communication based on a side uplink, where the method may be performed by a terminal device or a unit, a module or a chip inside the terminal device, and the method provided in the fifth aspect is described by taking the first terminal device as an example. The method comprises the following steps:

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

The first terminal device determines a 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 and the second carrier are associated. The first destination identifier comprises a layer two identifier of the second terminal device, and the first source identifier comprises a layer two identifier of the first terminal device.

Therefore, when the first terminal equipment subsequently needs to send the message to the second terminal equipment, the carrier wave to be used can be searched out according to the first association relation.

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

For another example, when 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 sends the fourth message on the second carrier according to the destination identifier corresponding to the fourth message, the source identifier corresponding to the fourth message, and the first association relationship, when the destination identifier corresponding to the fourth message includes the layer two identifier of the second terminal device, and when the source identifier corresponding to the fourth message includes the layer two identifier of the first terminal device.

The fifth aspect of the present application may be used in combination with the first aspect described above, e.g. the first terminal device may perform the first aspect or any of the possible implementation manners of the first aspect before the second carrier receives the third message from the second terminal device. For example, the first terminal device may send the first message on the first carrier and the second message on the second carrier before the second carrier receives the third message from the second terminal device. The second carrier is a carrier determined by the first terminal device that 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 the second terminal device.

The fifth aspect of the present application may also be used in combination with the foregoing third aspect, in which case the second carrier referred to in the fifth aspect is a preset carrier, for example, the first terminal device may perform any one of the foregoing third aspect or any one of the possible implementation manners of the third aspect before the second carrier receives the third message from the second terminal device. For example, the first terminal device determines the preset carrier on which the first terminal device sends the first message before the second carrier receives the third message from the second terminal device. The first message is used for discovering other terminal equipment; or, the first message is used for requesting to establish a link with the second terminal device. The preset carrier is a carrier of at least two carriers of a side-link configuration between the first terminal device and the second terminal device.

In a sixth aspect, an embodiment of the present application provides a method for communication based on a side uplink, where the method may be performed by a terminal device or a unit, a module or a chip inside the terminal device, and the method provided in the sixth aspect is described by taking a second terminal device as an example. The method comprises the following steps:

The second terminal equipment receives a second message from the first terminal equipment on a second carrier wave, and the second terminal equipment determines a second association relation.

Wherein the second association indicates that the second destination identifier is associated with a second carrier; or, the second association indicates that the second source identifier, the second destination identifier are associated with the second carrier. The second destination identifier comprises a layer two identifier of the first terminal device, and the second source identifier comprises a layer two identifier of the second terminal device. The second carrier is a carrier determined by the second terminal device and used for performing side-link communication with the first terminal device.

Therefore, when the second terminal equipment subsequently needs to send the message to the first terminal equipment, the carrier wave to be used can be found out according to the second association relation.

For example, if the second association relationship indicates that the second destination identifier is associated with the second carrier, the second terminal device sends the third message on the second carrier according to the destination identifier corresponding to the third message and the second association relationship, and if the destination identifier corresponding to the third message includes the layer two identifier of the first terminal device.

For another example, when the second association relationship indicates that the second source identifier, the second destination identifier and the second carrier are associated, the second terminal device sends the third message on 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, when the destination identifier corresponding to the third message includes the layer two identifier of the first terminal device and the source identifier corresponding to the third message includes the layer two identifier of the second terminal device.

The sixth aspect of the present application may be used in combination with the aforementioned second aspect, e.g. the second terminal device may perform any one of the possible implementations of the aforementioned second aspect or the first aspect before the second terminal device receives the second message from the first terminal device on the second carrier. For example, the second terminal device may be configured to, prior to the second carrier receiving the second message from the first terminal device: the second terminal device may monitor on a second carrier; or the second terminal equipment can monitor the first carrier wave and the second carrier wave; or the second terminal device may also receive the first message from the first terminal device, the second terminal device selecting the second carrier as the carrier with which the first terminal device communicates; or the second terminal device may not receive the first message from the first terminal device. The second carrier is a carrier determined by the first terminal device that 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 the second terminal device.

The sixth aspect of the present application may also be used in combination with the fourth aspect, in which case the second carrier referred to in the sixth aspect is a preset carrier, for example, the second terminal device may perform any one of the possible implementation manners of the fourth aspect or the fourth aspect before the second carrier receives the second message from the first terminal device. For example, the second terminal device determines the preset carrier before the second carrier receives the second message from the first terminal device, and the second terminal device monitors on the preset carrier.

In a seventh aspect, an embodiment of the present application provides a method for communication based on a side uplink, where the method may be performed by a terminal device or a unit, a module or a chip inside the terminal device, and the method provided in the seventh aspect is described by taking the method provided in the seventh aspect performed by the first terminal device as an example. The method comprises the following steps:

the first terminal equipment acquires first indication information, wherein the first indication information indicates one or more first time periods, and the first terminal equipment works on a first carrier and/or a second carrier in the one or more first time periods.

As such, the operating time of the first terminal device is divided into one or more first time periods, which may include a continuous period of time. The two first time periods may be separated by a period of time, i.e. the two first time periods are discontinuous. The first terminal device works on the first carrier wave and/or the second carrier wave in the first time period, and other times can be used for carrying out other works, so that the flexibility of the working mode of the first terminal device can be improved.

In one possible implementation, the first terminal device obtains second indication information, the second indication information indicating one or more second time periods. The first terminal device performs at least one of the following for one or more second time periods: the first terminal equipment monitors on a third carrier; or alternatively; the first terminal device transmits a message on a third carrier based on the side-uplink. The third carrier is different from the first carrier or the third carrier is different from the second carrier.

As such, the operating time of the first terminal device is divided into one or more second time periods, which may include a continuous time. The two second time periods may be separated by a period of time, i.e. the two second time periods are discontinuous. The first terminal device works on the third carrier in the second time period, and other times can be used for carrying out other works, so that the flexibility of the working mode of the first terminal device can be improved.

In one possible embodiment, there is no overlap between any of the one or more first time periods and any of the one or more second time periods.

If the first terminal device does not support to operate on the third carrier and other carriers (such as the first carrier and the second carrier) simultaneously in the same time period, the first terminal device may operate on the third carrier and other carriers in a time division multiplexing manner, so that the requirement on the capability of the first terminal device may be reduced.

In one possible embodiment, the first terminal device sends third indication information on a third carrier, where the third indication information is used to instruct the first terminal device to transmit a message on a side-uplink basis on the third carrier in one or more second time periods.

Because the other terminal equipment sends the message to the first terminal equipment in the third carrier in the non-second time period, and the first terminal equipment cannot receive the message, after the first terminal equipment sends the third indication information, the terminal equipment which communicates with the first terminal equipment on the third carrier can also communicate with the first terminal equipment in the second time period, and does not need to communicate with the first terminal equipment in the third carrier in the non-second time period, so that the resource waste of the other terminal equipment can be reduced.

The seventh aspect of the present application may be used in combination with the foregoing first aspect and/or fifth aspect, e.g. the first terminal device may perform at least one of the foregoing first aspect, the fifth aspect, any one of the possible implementation manners of the first aspect, or any one of the possible implementation manners of the fifth aspect for one or more first time periods. For example, the first terminal device may send a first message on a first carrier and a second message on a second carrier during 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. 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 the second terminal device. For another example, the first terminal device receives a 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 may also be used in combination with the foregoing third and/or fifth aspects, in which case the first carrier or the second carrier referred to in the seventh aspect is a preset carrier, for example, the first terminal device may perform any one of the foregoing third, fifth, third, or any one of the foregoing possible implementation manners of the fifth aspect in one or more first time periods. For example, the first terminal device transmits the first message on a preset carrier for one or more first time periods. The first message is used for discovering other terminal equipment; or, the first message is used for requesting to establish a link with the second terminal device.

In an eighth aspect, an embodiment of the present application provides a method for side-link based communication, where the method may be performed by a terminal device or a unit, a module or a chip inside the terminal device, and the method provided in the eighth aspect is described by taking the second terminal device as an example. The method comprises the following steps:

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

As such, the operating time of the first terminal device is divided into one or more first time periods, which may include a continuous period of time. The two first time periods may be separated by a period of time, i.e. the two first time periods are discontinuous. The second terminal device works on the first carrier wave and/or the second carrier wave in the first time period, and other times can be used for carrying out other works, so that the flexibility of the working mode of the second terminal device can be improved.

In one possible embodiment, the second terminal device obtains fifth indication information, the fifth indication information indicating one or more third time periods. The second terminal device performs at least one of the following for one or more third time periods: the second terminal equipment monitors on a fifth carrier; or alternatively; the second terminal device transmits a message on a fifth carrier based on the side-uplink. 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, which may comprise a continuous time. The two third time periods may be separated by a period of time, i.e. the two third time periods are discontinuous. The second terminal device works on the fifth carrier wave in the third time period, and other times can be used for carrying out other works, so that the flexibility of the working mode of the second terminal device can be improved.

In one possible embodiment, there is no overlap between any of the one or more first time periods and any of the one or more third time periods. The third time period of the present application may be the same as the second time period, and may be different from any of the second time periods, which is not limited in the embodiment of the present application.

If the second terminal device does not support to operate on the fifth carrier and other carriers (such as the first carrier and the second carrier) simultaneously in the same time period, the second terminal device may operate on the fifth carrier and other carriers in a time division multiplexing manner, so as to reduce the requirement on the capability of the second terminal device.

In one possible embodiment, the second terminal device transmits sixth indication information on the fifth carrier, the sixth indication information being used to instruct the second terminal device to transmit a message on a side-uplink basis on the fifth carrier in one or more third time periods.

Because the other terminal equipment sends the message to the second terminal equipment by the fifth carrier in the non-third time period and the second terminal equipment cannot receive the message, after the second terminal equipment sends the sixth indication information, the terminal equipment which communicates with the second terminal equipment on the fifth carrier can also communicate with the second terminal equipment in the third time period, and does not communicate with the second terminal equipment on the fifth carrier in the non-third time period, so that the resource waste of the other terminal equipment can be reduced.

The eighth aspect of the present application may be used in combination with the foregoing second and/or sixth aspects, e.g. the second terminal device may perform at least one of the foregoing second aspect, sixth aspect, any one of the possible embodiments of the second aspect, or any one of the possible embodiments of the sixth aspect for one or more first time periods. 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, the second terminal device selecting the second carrier as the carrier with which the first terminal device communicates; or the second terminal device may not receive the first message from the first terminal device. The second carrier is a carrier determined by the first terminal device that 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 the second terminal device.

The eighth aspect of the present application may also be used in combination with the fourth and/or sixth aspect, where the first carrier or the second carrier referred to in the eighth aspect is a preset carrier, for example, the second terminal device may perform any one of the possible implementation manners of the fourth aspect, the sixth aspect, the fourth aspect, or at least one of the possible implementation manners of the sixth aspect in one or more first time periods. For example, the second terminal device determines the preset carrier on which the second terminal device listens before the second terminal device receives the second message from the first terminal device over one or more first time periods.

In a ninth aspect, an embodiment of the present application provides a method for communication based on a side uplink, where the method may be performed by a terminal device or a unit, a module or a chip inside the terminal device, and the present application is described taking a method provided by a first terminal device in the ninth aspect as an example. The method comprises the following steps:

the first terminal device sends a first request message to the fourth terminal device on the fourth carrier, the first request message requesting side-link based communication with the fourth terminal device on the second carrier.

Thus, if the first terminal device needs to operate on the second carrier, but the first terminal device does not support to operate on the second carrier and the fourth carrier at the same time, the problem can be solved by migrating the communication on the fourth terminal device to the second carrier, so that the capability requirement on the first terminal device can be reduced.

The ninth aspect of the present application may also be used in combination with the foregoing third and/or fifth aspects, in which case the first carrier or the second carrier referred to in the seventh aspect is a preset carrier.

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

The ninth aspect of the present application may also be used in combination with the seventh aspect, for example, when the fourth terminal device refuses to migrate to the second carrier, the first terminal device may use the solution provided in the seventh aspect, and operate on the second carrier in a first period of time, and operate on a non-second carrier (such as on the fourth carrier) in other periods of time other than the first period of time (such as the second period of time).

It should be noted that, the solution provided in the ninth aspect may also be executed by the second terminal device, for example, when the second terminal device determines that the second terminal device needs to operate on the second carrier, communications on other carriers than the second carrier may also be migrated to the second carrier, and the solution may also be used in combination with the fourth aspect, the sixth aspect, the second aspect, and the eighth aspect. The scheme is similar to the above and will not be repeated.

In a tenth aspect, a communication apparatus is provided, which may be the first terminal device or the second terminal device described above, and the communication apparatus may include a communication unit and a processing unit to perform any implementation manner of the method of any one of the first to ninth aspects described above. The communication unit is configured to perform functions related to transmission and reception. Optionally, the communication unit includes a receiving unit and a transmitting unit. In one design, the communication device may be 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 comprises respective modules operable to perform any of the embodiments of any of the methods of the first to ninth aspects described above.

In an eleventh aspect, a communication apparatus is provided, which may be the first terminal device or the second terminal device described above, and the communication apparatus may include a processor and a memory. Optionally, the apparatus further comprises a transceiver for storing a computer program or instructions, the processor being adapted to invoke and run the computer program or instructions from the memory, which when executed by the processor, cause the communication device to perform any of the embodiments of the methods of any of the first to ninth aspects described above.

In the alternative, the processor is one or more, and the memory is one or more.

Alternatively, the memory may be integrated with the processor or the memory may be separate from the processor.

Alternatively, a transmitter (transmitter) and a receiver (receiver) may be included in the transceiver.

In a twelfth aspect, a communication apparatus is provided, which may be the first terminal device or the second terminal device described above, and the communication apparatus may include a processor. The processor is coupled to the memory and is operable to perform the method of any one of the first to ninth aspects and any one of the possible implementation manners of the first to ninth aspects. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, and the processor is coupled to the communication interface.

In one implementation, where the communication apparatus 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 yet another implementation, when the communication device is a chip or a system-on-chip, the communication interface may be an input/output interface, interface circuitry, output circuitry, input circuitry, pins or related circuitry, etc. on the chip or system-on-chip. A processor may also be embodied as processing or logic circuitry.

In a thirteenth aspect, a system is provided, the system comprising the first terminal device and one or more second terminal devices as described above, and possibly one or more third terminal devices.

In a fourteenth aspect, there is provided a computer program product comprising: a computer program (which may also be referred to as code, or instructions) which, when executed, causes a computer to perform the method in any one of the possible implementations of the first aspect described above, or causes a computer to perform the method in any one of the implementations of the first to ninth aspects described above.

In a fifteenth aspect, there is provided a computer readable storage medium storing a computer program (which may also be referred to as code, or instructions) which, when run on a computer, causes the computer to perform the method of any one of the possible implementations of the first aspect or causes the computer to perform the method of any one of the implementations of the first to ninth aspects.

In a sixteenth aspect, a system on a chip is provided, which may include a processor. The processor is coupled to the memory and is operable to perform the method of any one of the first to ninth aspects and any one of the possible implementations of any one of the first to ninth aspects. Optionally, the system on a chip further comprises a memory. Memory for storing a computer program (which may also be referred to as code, or instructions). A processor for invoking and running a computer program from a memory, causing a device on which the system-on-chip is installed to perform any one of the first to ninth aspects and a method in any one of the possible implementations of any one of the first to ninth aspects.

A seventeenth aspect provides a communication apparatus, which may be the first terminal device or the second terminal device, the communication apparatus may include: interface circuitry and processing circuitry. The interface circuit may include an input circuit and an output circuit. The processing circuit is configured to receive a signal via the input circuit and to transmit a signal via the output circuit such that the method of any one of the first to ninth aspects and any one of the possible implementations of the first to ninth aspects is implemented.

In a specific implementation process, the 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 trigger, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the output signal may be output by, for example and without limitation, a transmitter and transmitted by a transmitter, and the input circuit and the output circuit may be the same circuit, which functions as the input circuit and the output circuit, respectively, at different times. The application is not limited to the specific implementation of the processor and various circuits.

In one implementation, when the communication apparatus is a wireless communication device, the wireless communication device may be a terminal such as a smart phone or a radio 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, the communication apparatus may be part of a device in a wireless communication device, such as an integrated circuit product, e.g., 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 circuitry, etc. on the chip or system of chips. The processing circuitry may be logic circuitry on the chip.

Drawings

FIG. 1a is a schematic diagram of one possible communication system to which embodiments of the present application are applicable;

fig. 1b is a schematic diagram of another possible application scenario of a terminal device side uplink according to an embodiment of the present application;

fig. 1c is a schematic diagram of another possible application scenario of a terminal device side uplink according to an embodiment of the present application;

fig. 2a is a schematic diagram of a method for establishing a possible V2X communication unicast mode layer two link according to an embodiment of the present application;

fig. 2b is a schematic flow chart of a possible ProSe Direct Discovery (Direct Discovery) method according to an embodiment of the present application;

fig. 2c is a schematic flow chart of a possible ProSe Direct Discovery (Direct Discovery) method according to an embodiment of the present application;

fig. 2d is a schematic diagram of a protocol stack of an interface between terminal devices according to an embodiment of the present application;

fig. 2e is a schematic diagram of a protocol stack of an interface between a terminal device and a terminal device according to another embodiment of the present application;

fig. 3 is a schematic flow chart of a communication method based on a side uplink according to an embodiment of the present application;

fig. 4a is a schematic flow chart of another signaling/data transmission method based on a side uplink according to an embodiment of the present application;

Fig. 4b is a schematic flow chart of another signaling/data transmission method based on a side uplink according to an embodiment of the present application;

fig. 5a is a schematic flow chart of another signaling/data transmission method based on a side uplink according to an embodiment of the present application;

fig. 5b is a schematic flow chart of another signaling/data transmission method based on a side uplink according to an embodiment of the present application;

fig. 6a is a schematic flow chart of another signaling/data transmission method based on a side uplink according to an embodiment of the present application;

fig. 6b is a schematic flow chart of another signaling/data transmission method based on a side uplink according to an embodiment of the present application;

fig. 7 is a schematic flow chart of another signaling/data transmission method based on a side uplink according to an embodiment of the present application;

fig. 8 is a flow chart of another signaling/data transmission method based on a side uplink according to an embodiment of the present application;

fig. 9a is a schematic flow chart of another signaling/data transmission method based on a side uplink according to an embodiment of the present application;

fig. 9b is a schematic diagram of a possible time division multiplexing pattern (pattern) of operation of the first terminal device according to an embodiment of the present application;

fig. 10a is a schematic flow chart of another signaling/data transmission method based on a side uplink according to an embodiment of the present application;

Fig. 10b is a schematic diagram of a possible working carrier of a first terminal device according to an embodiment of the present application;

FIG. 11 is a schematic structural diagram of an apparatus according to an embodiment of the present application;

FIG. 12 is a schematic view of another device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of another device according to an embodiment of the present application.

Detailed Description

The technical scheme of the embodiment of the application can be applied to various communication systems, such as: global system for mobile communications (global system for mobile communications, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA) systems, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, WIMAX) communication systems, fifth generation (5th generation,5G) systems or New Radio (NR), or applications in future communication systems or other similar communication systems, next generation wireless local area network systems, etc.

In addition, the technical scheme provided by the embodiment of the application is applied to Side Link (SL). The side-link may be used in a variety of applications, such as cellular links, inter-device links, e.g., device-to-device (D2D) links, networking (vehicle to everything, V2X) and proximity services (Proximity based service, proSe) scenarios.

Illustratively, D2D may be D2D in a long term evolution (long term evolution, LTE) communication system, D2D in a New Radio (NR) communication system, or D2D in other communication systems that may occur as technology advances.

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

By way of example, the V2X scene may be embodied as any one of the following systems: vehicle-to-vehicle communications (vehicle to vehicle, V2V), vehicle-to-person communications (vehicle to pedestrian, V2P), vehicle-to-network (vehicle to network, V2N) traffic, and vehicle-to-infrastructure communications (vehicle to infrastructure, V2I), among others.

Wherein one participant of the V2N is a terminal device and the other participant is a service entity. V2N is the most widely used form of internet of vehicles at present, and its main function is to connect the vehicle to the cloud server through the mobile network, so as to provide functions of navigation, entertainment, anti-theft, etc. through the cloud server.

Both participants of V2V are terminal devices. V2V may be used as a reminder for information interaction between vehicles, the most typical application being for an inter-vehicle collision avoidance safety system.

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

One participant in V2I is a terminal device and the other participant is an infrastructure (or a road facility). The V2I may be used as a communication between a vehicle and an infrastructure, for example, the infrastructure may be a road, a traffic light, a road barrier, etc., and road management information such as a timing of a traffic light signal may be acquired.

In the embodiment of the present application, the transmitting end and the receiving end in V2X may be D2D devices or V2X devices. For example, the transmitting end and the receiving end in V2X may be both terminal devices or terminals.

The Sidelink (SL) in the embodiments of the present application may also be referred to as a sidelink, a direct link, a side link, or a secondary link. In the embodiment of the present application, the above terms refer to links established between devices of the same type, and the meanings of the links are the same. The same type of device may be a link between terminal devices, a link between base stations, a link between relay nodes, or the like, which is not limited in the embodiment of the present application. For the link between the terminal device and the terminal device, there is a D2D link defined by release (Rel) -12/13 of 3GPP, and there is also a V2X link defined by 3GPP for the internet of vehicles, vehicle-to-vehicle, vehicle-to-handset, or vehicle-to-any entity, including Rel-14/15. Also included are Rel-16, currently under investigation by 3GPP, and later releases of V2X links based on NR systems, etc.

Fig. 1a shows a possible schematic diagram of a communication system to which embodiments of the application are applicable. As shown in fig. 1a, the communication system 100 includes: network devices and terminal devices (such as V2X UE1 and V2X UE 2).

The terminal device in the embodiment of the present application may also be referred to as a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc., which is a device that provides voice or data connectivity to a user, or may also be an internet of things device. For example, the terminal device includes a handheld device having a wireless connection function, an in-vehicle device, and the like. The terminal device may be: a mobile phone, a tablet, a laptop, a palmtop, a mobile internet device (mobile internet device, MID), a wearable device (e.g., a smartwatch, a smartband, a pedometer, etc.), a vehicle-mounted device (e.g., an automobile, a bicycle, an electric car, an airplane, a ship, a train, a high-speed rail, etc.), a Virtual Reality (VR) device, an augmented reality (augmented reality, AR) device, a wireless terminal in an industrial control (industrial control), a smart home device (e.g., a refrigerator, a television, an air conditioner, an electric meter, etc.), a smart robot, a workshop device, a wireless terminal in a drone (self driving), a wireless terminal in a teleoperation (remote medical surgery), a wireless terminal in a smart grid (smart grid), a wireless terminal in a transportation security (transportation safety), a wireless terminal in a smart city (smart city), or a wireless terminal in a smart home (smart home), a flying device (e.g., a smart robot, a hot balloon, an airplane, etc. The equipment for realizing the functions in the embodiment of the application is uniformly introduced by taking the terminal equipment as an example. It should be understood that the terminal device in the embodiment of the present application may also refer to a chip in the terminal, a communication device having a D2D, V2X or ProSe communication function, a unit or a module, etc., such as a vehicle-mounted communication device, a vehicle-mounted communication module or a vehicle-mounted communication chip, etc. Terminal devices supporting the 5G ProSe requirements and related procedures may also be referred to as 5G ProSe terminals (5G ProSe-enabled UEs). In fig. 1a, terminal devices V2X UE1 and V2X UE2 are shown as examples.

The network device in the embodiment of the application is a device for accessing the terminal device to the wireless network in the network. The network device may be a node in a radio access network, also referred to as a base station, and also referred to as a radio access network (radio access network, RAN) node (or device). The network device may be operable to inter-convert the received air frames with Internet Protocol (IP) packets as a router between the terminal device and the rest of the access network, which may include an IP network. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved Node B (NodeB) or an eNB or an e-NodeB, evolutional Node B) in a long term evolution (long term evolution, LTE) system or an evolved LTE system (LTE-Advanced, LTE-a), or may also include a next generation Node B (next generation Node B, gNB) in a New Radio (NR) system of a fifth generation mobile communication technology (5th generation,5G), or may also include a transmission receiving point (transmission reception point, TRP), a home base station (e.g., home evolved NodeB, or home Node B, HNB), a baseband unit (BBU), or a WiFi Access Point (AP), etc., and may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a cloud access network (cloud radio access network, cloudRAN) system, and the embodiment of the present application is not limited. As another example, a network device in V2X technology is a Road Side Unit (RSU), which may be a fixed infrastructure entity supporting V2X applications, and may exchange messages with other entities supporting V2X applications. In fig. 1a, a network device is shown as an example of a base station.

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

The PC5 interface refers to an interface between terminal devices, and direct communication between the terminal devices is side uplink communication, which is used for communication between the terminal devices. The side-link based communication may use at least one of the following channels: a physical side uplink shared channel (physical sidelink shared channel, PSSCH) for carrying data (data); a physical side-link control channel (physical sidelink control channel, PSCCH) for carrying side-link control information (sidelink control information, SCI), also known as scheduling assignment (scheduling assigment, SA). In the embodiment of the application, when the communication between the terminal equipment is in the unicast mode, a PC5 unicast link is established between the terminal equipment and the terminal equipment. For example, when V2X traffic is carried over a PC5 unicast link, the PC5 unicast link between two terminal devices allows the two terminal devices to conduct V2X communications for one or more pairs of V2X traffic. The PC5 unicast link between two terminal devices may support one or more V2X traffic types. The PC5 unicast link may also be referred to as a layer two link over the PC5 interface.

The Uu interface is a communication interface between a terminal device and a network device, and a communication link between the terminal device and the network device includes an Uplink (UL) and a Downlink (DL). The communication based on Uu interface may be that the sender terminal device sends the data to the network device through Uu interface, sends the data to the application server for processing through the network device, and then sends the processed data to the network device through the application server, and sends the processed data to the receiver terminal device through the network device.

In the Uu interface-based communication mode, the network device for forwarding the uplink data from the sender terminal device to the application server and the network device for forwarding the downlink data from the application server to the receiver terminal device may be the same network device or may be different network devices, and may be specifically determined by the application server.

Various scenarios of side-link transmission between terminal devices are involved in the embodiments of the present application, and fig. 1b and fig. 1c are schematic diagrams illustrating several possible application scenarios of side-link transmission between terminal devices in the embodiments of the present application, respectively, as shown in fig. 1b, where the side-link transmission between terminal devices may further include transmission between a remote terminal device (remote UE) and a relay terminal device (relay UE). A relay terminal equipment (relay UE) may provide a function of supporting a remote terminal equipment (remote UE) to connect with a Data Network (DN). A remote terminal device (remote UE) may communicate with the DN through a relay terminal device (relay UE), such as the remote terminal device (remote UE) may communicate one-to-one through a unicast link established with the relay terminal device (relay UE).

As shown in fig. 1c, the side uplink transmission between the terminal devices may also include a transmission between the destination terminal device and the relay terminal device, or may also include a transmission between the relay terminal device and the source terminal device. A relay terminal equipment (relay UE) may provide a function of supporting connection of a source terminal equipment with a destination terminal equipment.

In the embodiment of the present application, the Relay terminal device (Relay UE) may also be referred to as a Relay device, a terminal device-Network device Relay (UE-to-Network Relay), or the like. The scheme provided by the embodiment of the application can also be applied to 5G ProSe service, in which case the Relay terminal device in the embodiment of the application can also be called as 5G ProSe terminal device-Network device Relay (UE-to-Network Relay), 5G ProSe Relay terminal device (Relay UE), or 5G ProSe terminal device-Network device Relay terminal device (UE-to-Network Relay UE), etc., and the embodiment of the application is not limited.

In order to more clearly describe the schemes provided by the embodiments of the present application, terms and nouns related to the embodiments of the present application are explained and described below.

(1) The type of propagation between the terminal devices.

In a wireless communication system, a plurality of propagation types (cast types) such as broadcast communication, unicast communication, multicast communication, and the like can be supported on a side link between terminal devices.

(1.1) broadcast communications.

The broadcast communication is similar to the base station broadcasting system information, i.e. the terminal device does not encrypt the data of the broadcast service transmitted to the outside, and any other terminal device within the effective receiving range can receive the data of the broadcast service if interested in the broadcast service.

When the terminal device sends the message in a broadcast communication mode, the source identifier and the destination identifier are sent along with the message, for example, the source identifier may be allocated by the sending end 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 data communication performed after a radio resource control (radio resource control, RRC) connection is established between a terminal device and a base station, requiring prior establishment of a unicast connection (e.g., establishment of a unicast connection for PC 5) between two terminal devices. After the unicast connection is established, the two terminal devices may communicate data based on the negotiated identity, which may or may not be encrypted.

When the terminal equipment adopts a unicast communication mode to send a message, a source identifier and a destination identifier are sent along with the message, wherein the source identifier can be distributed for the unicast connection by the sending end equipment of the message, and the destination identifier can be distributed for the unicast connection by the receiving end equipment of the message.

(1.3) multicast communication.

At least two terminal devices may form a communication group (or called a multicast group or a terminal group), and multicast communication refers to that data of a multicast service sent by any terminal device in the communication group may be received by other terminal devices in the communication group.

When the terminal equipment adopts a multicast communication mode to send the message, the source identifier and the destination identifier are sent along with the message, and the destination identifier can be an identifier corresponding to the communication group. Within a communication group, all terminal devices can transmit and receive data with the same destination identifier, and different terminal devices can transmit data with respective source identifiers.

(2) Several side-link related flows are contemplated by embodiments of the present application.

The embodiment of the application describes two related flows of the side links, which are respectively as follows: a communication process related procedure based on the side link, and a discovery process related procedure based on the side link. The communication process related flow based on the side link comprises a V2X or ProSe communication unicast mode layer two link establishment related flow. The side-link based discovery process related procedures include ProSe discovery related procedures.

The related flow of the communication process based on the side link in the embodiment of the application can comprise a flow for establishing a unicast link based on the side link between two terminal devices. Since the side-link between the terminal devices is implemented based on the PC5 interface, the unicast link based on the side-link established between the two terminal devices may also be referred to as a PC5 unicast link in the embodiment of the present application. The names of interfaces for data transmission based on the side links between the terminal devices may change in the future, and the names of unicast links in the embodiment of the present application may also change accordingly.

The ProSe discovery related procedure in the embodiment of the application can be used for discovering other terminal devices.

(2.1) a side-uplink based communication process related procedure.

Two possible side-link based communication process related flows for the V2X service and ProSe service are described below by way of example.

(2.1.1) a communication process related procedure based on a side link corresponding to the V2X service.

The following describes, by taking the V2X communication unicast mode layer two link establishment procedure as an example, a related procedure of a communication procedure based on a side uplink corresponding to the V2X service, where the V2X communication unicast mode layer two link establishment procedure may also be referred to as a related procedure of unicast mode V2X communication on the PC5 reference point, or a unicast link establishment procedure of the V2X service.

Fig. 2a is a schematic diagram illustrating a possible V2X communication unicast mode layer two link establishment procedure, and fig. 2a is presented by way of example of execution of the first terminal device and the second terminal device, and as shown in fig. 2a, the method includes:

in step 201, the first terminal device sends a direct communication request (direct communication request, DCR) message.

The DCR message may be used to initiate a unicast layer two link establishment procedure. The DCR message may include one or more of source user information (Source User information), destination traffic information, security information, destination user information (target User information).

The source user information may include an application layer identification of the first terminal device. When the DCR message is used to initiate a unicast layer two link establishment procedure corresponding to the ProSe service, the destination service information may include information of a ProSe identifier requesting to establish a layer two link (unicast link). When the DCR message is used to initiate a unicast layer two link establishment procedure corresponding to the V2X service, the service information may include information of the V2X service type requesting to establish the layer two link (unicast link). The security information may include: secure information is established (the information for the establishment of security). The destination user information may include an application layer identification of the destination user. When the DCR message is a unicast message, the destination user information may include an application layer identification of the second terminal device. When the DCR message is a broadcast message, the DCR message may not include the destination user information. In the future, the DCR message may also be transmitted in other manners, such as multicast, where the DCR message is a multicast message, the destination user information may include an application layer identifier of the communication group corresponding to the second terminal device.

When the DCR message is transmitted in a lower layer, a source Identifier (ID) and a destination identifier may be further included in a data packet and/or a control signaling of the data packet corresponding to the DCR message, where the source identifier and the destination identifier are used for sending the DCR message. Wherein the source identifier for transmitting the DCR message may include a layer two identifier of the first terminal device. The layer two identification of the first terminal device may be assigned by the first terminal device itself.

The DCR message may be sent by unicast or broadcast means.

When the DCR message is sent in a unicast manner, the DCR message may be sent separately to other terminal devices (such as the second terminal device shown in fig. 2 a). The destination identifier for transmitting the DCR message may be a layer two identifier of the second terminal device. Wherein the layer two identity of the second terminal device may be discovered during the PC5 unicast link establishment or known to the first terminal device via a previous V2X communication. For example, a unicast link exists in advance, 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, and the first terminal device may acquire the layer two identifier of the second terminal device according to the unicast link. For another example, the first terminal device may obtain the layer two identifier of the second terminal device from an 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 two identifier of the second terminal device through the discovery process.

When the DCR message is sent by broadcasting, the destination identifier for sending the DCR message may include a preset layer two identifier. For example, the destination identifier for sending the DCR message may include a default destination layer two identifier (broadcast layer two identifier) for the service association. For example, the destination identifier for sending the DCR message may be a default destination layer two identifier associated with the V2X service type.

Future DCR messages may also be sent by other transmission means, such as by multicast. When the DCR message is sent by multicast, the destination identifier for sending the DCR message may include a layer two 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 perform a security setup procedure with the first terminal device in response to the received DCR message. In the security establishment procedure 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. In fig. 2a, a message for establishing security is shown by taking a case that the second terminal device sends to the first terminal device, and in practical application, other information transmission modes may exist between the first terminal device and the second terminal device in the security establishment process, which is not limited by the embodiment of the present application.

When the DCR message is a broadcast message, the second terminal device may be one of one or more terminal devices interested in the service (e.g., V2X service type) published by the first terminal device among the terminal devices other than the first terminal device. It should be noted that, when the DCR message is multicast, one or more terminal devices may return a response message to the first terminal device, and the response message returned by the second terminal device to the first terminal device is illustrated in fig. 2a as an example.

For the second terminal device, the source identifier used for the security establishment procedure may be a layer two identifier of the second terminal device, where the layer two identifier of the second terminal device may be allocated to the second terminal device itself. The destination identifier used in the security establishment procedure may be a source layer two identifier of the DCR message, i.e. a layer two identifier of the first terminal device. The source identifier and the destination identifier for the security establishment process may be included in the data packet corresponding to the message for establishing security.

It can be seen that the second terminal device may obtain the layer two identifier 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 two identification of the other terminal device (such as the second terminal device) by receiving the data packet corresponding to the message for establishing the security from the other terminal device (such as the second terminal device). Through the flow shown in fig. 2a, the first terminal device and the second terminal device may exchange layer two identifications with each other, and then may transmit signaling and data in future communications based on the exchanged layer two identifications.

In step 203, the second terminal device sends a direct communication acceptance message to the first terminal device.

The V2X layer or the PC5 signaling protocol (PC 5 signalling protocol) layer of the first terminal device, or a higher layer of an Access Stratum (AS) layer may pass the PC5 link identifier allocated for the unicast link and PC5 unicast link related information to the AS layer. The PC5 unicast link related information includes a layer two identifier (e.g., may include a source layer two identifier and a destination layer two identifier) and corresponding PC5 QoS parameters. In this way, the AS layer of the first terminal device may be enabled to maintain the PC5 link identifier and PC5 unicast link related information. Similarly, the V2X layer or the PC5 signaling protocol layer of the second terminal device, or a higher layer of the access layer may also transfer the PC5 link identifier and the PC5 unicast link related information allocated for the unicast link to the AS layer, so that the AS layer of the second terminal device may be enabled to maintain the PC5 link identifier and the PC5 unicast link related information.

And 204, transmitting data corresponding to the service between the first terminal equipment and the second terminal equipment.

In step 204, the first terminal device and the second terminal device may transmit data corresponding to a service (e.g., V2X service) over the established PC5 unicast link.

(2.1.2) a communication process related procedure based on a side link corresponding to ProSe service.

In the embodiment of the application, a link establishment flow of ProSe direct communication (direct communication) is taken as an example to introduce a related flow of a communication process based on a side link corresponding to ProSe service. ProSe direct communication may also be referred to as ProSe direct connection. The link establishment procedure of ProSe direct communication in the embodiment of the present application may also be referred to as a related procedure of unicast mode ProSe direct connection on the PC5 reference point. The PC5 unicast link established based on the link establishment procedure of ProSe direct communication can be maintained, modified and released according to the application layer request or the communication requirement.

In a possible implementation manner, the link establishment procedure of ProSe direct communication may multiplex the establishment procedure of the unicast link of the V2X service described in fig. 2a, and the difference point may include: the V2X traffic types referred to in steps 201 and 202 may be replaced by ProSe identifiers. The V2X traffic in step 204 may be replaced with ProSe applications or ProSe traffic. The V2X layer of the first and second terminal devices referred to in the relevant content of fig. 2a may be replaced by a ProSe layer.

In a possible implementation, the 5G ProSe remote terminal device may also initiate a one-to-one communication connection with the selected relay terminal device on the PC5 using the link setup procedure of ProSe direct communication described above. The first terminal device may be a remote terminal device, and the second terminal device may be a relay terminal device selected for the first terminal device. The distinguishing points may include the following:

The source user information in the DCR message of step 201 described above may include an identification of the remote terminal device requesting the relay operation, such as a user information identification (User information ID). The destination user information may include an identification of the relay terminal device, such as user information identification (User information ID), provided to the 5G ProSe remote terminal device during the relay discovery process. The user information identity (user information identity in the source user information, and/or user information identity in the destination user information) may be configured for 5G ProSe relay discovery according to the policy of the HPLMN or by the ProSe application server that assigned the ID. The service information may include a relay service code, which may be used to represent a connection service provided by the relay terminal device according to a 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 (e.g., 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 one of the relay service codes that the second terminal device includes during the relay discovery procedure, the second terminal device may perform a security setup procedure with the first terminal device in response to the DCR message.

In the case of a 5G ProSe layer two relay, step 204 may not be performed and the first and second terminal devices may transmit data between the remote terminal device and the DN on the established unicast link.

(2.2) side-link based discovery process related procedures.

In the following, two possible side-link-based Discovery process related flows are described by taking ProSe service as an example, which are respectively a link establishment flow of ProSe Direct Discovery (Direct Discovery) and a link establishment flow of relay Discovery.

(2.2.1) Link establishment procedure for ProSe Direct Discovery (Direct Discovery).

There are two modes of link establishment procedures for ProSe Direct Discovery (Direct Discovery), which are described by the following (2.2.1.1) and (2.2.1.2), respectively.

(2.2.1.1) mode A (Model A).

Mode a (Model a): a discovery protocol message (notification mode) is utilized (corresponding to the contents of 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, the terminal device has two roles:

publisher (announcing): a terminal device for distributing certain information, such as being a distributor (announcing), may send a discovery message.

Listener (monitoring): a terminal device for listening to information of interest, such as being a listener (monitoring), may listen/receive discovery messages.

Fig. 2b schematically shows a method flow diagram of one possible ProSe Direct Discovery (Direct Discovery), as shown in fig. 2b, the method comprising:

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 the application can also be called discovery message, or announcement message, etc.

The discovery message may include a message type, etc. In the embodiment of the application, the message type can comprise one or more of a discovery type, a content type and a discovery model.

The source and destination identifications of the discovery message may be used to transmit the discovery message. The source identifier may include a layer two identifier of the source end, and the destination identifier may include a layer two identifier of the destination end. The source identifier for sending the discovery message may be a layer two identifier for ProSe direct discovery selected by the first terminal device itself or a source layer two identifier for discovery of group members (group member discovery) selected by the first terminal device itself. The destination identifier used to send the Discovery message may be a layer two identifier of the destination of the ProSe service (or ProSe service or ProSe identifier) map, which may be used to send/receive initial signaling in ProSe Direct Discovery (such as the Discovery message in step 211).

(2.2.1.2) mode B (Model B).

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

Under this model, the terminal device has two roles:

discoverer (discover): for sending a request message, the request message may include information that the terminal device is interested in discovering, such as a response message of the request message that a terminal device as a Discoverer (Discoverer) may listen to replies from other terminal devices after sending the request message.

Discoveree (discover): for listening to and receiving a request message and may reply to a response message to the request message after receiving the request message, the response message of the request message may include information related to the content requested by the request message.

Fig. 2c illustrates a schematic flow diagram of a possible ProSe Direct Discovery (Direct Discovery) method, as shown in fig. 2c, comprising:

In 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 the application can also be called a discovery message, etc.

The source and destination identifications of the request message may be used to send the request message. The source identifier may include a layer two identifier of the source end, and the destination identifier may include a layer two identifier of the destination end. The source identifier for sending the request message may be a layer two identifier for ProSe direct discovery selected by the first terminal device itself or a source layer two identifier for discovery of group members (group member discovery) selected by the first terminal device itself. The destination identifier used to send the request message may be a layer two identifier of the destination end mapped by the ProSe service (or ProSe service or ProSe identifier), which may be used to send/receive initial signaling in ProSe Direct Discovery (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, there may be one or more other terminal devices that return a response message to the request message to the first terminal device, and the response message of the request message returned by the second terminal device to the first terminal device is described in fig. 2c as an example.

The source and destination identifications 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 a layer two identifier of the source end, and the destination identifier may include a layer two identifier of the destination end. The source identifier of the response message for sending the request message may be a layer two identifier for ProSe direct discovery selected by the second terminal device itself or a source layer two identifier for discovery of group members (group member discovery) selected by the second terminal device itself. The destination identifier of the response message used for sending the request message may be the source layer two identifier of the request message in step 211, i.e. the layer two identifier of the first terminal device.

(2.2.2) Link establishment procedure for Relay discovery.

The link establishment procedure of relay discovery may also employ the two modes shown in fig. 2b and 2c described above. The relay discovery in the embodiment of the present application may also be referred to as terminal equipment-to-Network (UE-to-Network) relay discovery, and for convenience of understanding, the embodiment of the present application is described by taking the relay discovery as an example.

(2.2.2.1) in the case where the link establishment flow of relay Discovery uses the mode shown in fig. 2b described above to establish a link, the differences from the link establishment flow of ProSe Direct Discovery (Direct Discovery) may include the following:

The first terminal device in fig. 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 end device in step 211 may include a message type, advertiser information, and a relay service code (Relay Service Code, RSC), etc. The advertiser information in embodiments of the present application may include information provided about the advertising user (i.e., user information ID). The relay service code may be used for 5G ProSe relay discovery to instruct the relay terminal device to provide connection services to the 5G ProSe remote terminal device.

The source and destination identifications of the discovery message are used to send the discovery message. The source identifier may include a layer two identifier of the source end, and the destination identifier may include a layer two identifier of the destination end. The source identifier for sending the discovery message may be a layer two identifier for relay discovery selected by the first terminal device. The destination identifier used to send the discovery message may be a default pre-configured layer two identifier that may be used to send/receive initial signaling in relay discovery (e.g., the discovery message in step 211).

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

(2.2.2.2) in the case where the link establishment procedure of relay Discovery uses the mode shown in fig. 2c described above to establish a link, the differences from the link establishment procedure of ProSe Direct Discovery (Direct Discovery) may include the following:

the first terminal device in fig. 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 end device in step 221 may include a message type, a finder information, an RSC, etc.

The source identifier and the destination identifier of the request message may be used to send the request message, where the source identifier may include a layer two identifier of the source end, and the destination identifier may include a layer two identifier of the destination end. The source identifier used for sending the request message may be a layer two identifier for relay discovery selected by the first terminal device. The destination identifier used to send the request message may be a default pre-configured layer two identifier that may be used to send/receive initial signaling in the relay discovery (e.g., the request message in step 221).

For the terminal device (e.g., the second terminal device and the third terminal device) that receives the request message of step 221, upon determining that the terminal device matches the RSC value included in the request message, a response message to the request message may be returned to the first terminal device by performing step 222. In fig. 2c, a response message is schematically shown, in which the second terminal device returns the request message to the first terminal device.

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

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

(3) Protocol stack of interface between terminal equipment and terminal equipment.

Fig. 2d and 2e show schematic diagrams of protocol stacks of two terminal devices and interfaces between the terminal devices, respectively. Fig. 2d may be a protocol stack corresponding to the 5G discovery plane PC5 interface (5G discovery plane PC5 interface). As shown in fig. 2d, the protocol layers include, from top to bottom, a ProSe discovery protocol (ProSe discovery protocol) layer, a packet data convergence protocol (packet data convergence protocol, PDCP) layer, a radio link control (radio link control, RLC) layer, a medium access control (media access control, MAC) layer, and a Physical (PHY) layer.

Fig. 2e may be a protocol stack corresponding to the 5g PC5 signaling protocol (5G PC5 signalling protocol). As shown in fig. 2e, each protocol layer includes a PC5 signaling protocol (PC 5 signalling protocol) layer, a PDCP layer, an RLC layer, a MAC layer, and a PHY layer from top to bottom.

The signaling (such AS discovery message, DCR, target message mentioned later, first message, second message, third message, etc.) involved in the embodiment of the present application may be a message (PC 5-S signaling/discovery message) generated by the PC5 signaling protocol layer or ProSe discovery protocol (ProSe discovery protocol) layer, and then transmitted through the AS layer. In other protocol stacks, the ProSe discovery protocol layer may be replaced by a ProSe layer.

The embodiment of the application can be also applicable to protocol stacks of interfaces between other terminal equipment and the terminal equipment, and in other protocol stacks, a PC5 signaling protocol layer can be replaced by a V2X layer.

(4) A source end layer two mark and a destination end layer two mark.

Embodiments of the present application relate to a plurality of messages, such as a discovery message, a DCR, a target message mentioned later, a first message, a second message, and a third message.

A sender higher layer (such AS V2X layer, proSe layer, PC5 signaling protocol layer, or higher layer of AS layer) generates a message, such AS a discovery message, DCR, a target message, a first message, a second message, or a third message, which will be described by taking the first message AS an example. After the transmitting end generates the first message at the higher layer, the first message is transmitted to the lower layer (such as an MAC layer, a PHY layer, etc.), and is encapsulated at the lower layer to obtain a data packet corresponding to the first message, for example, the PHY layer encapsulates the received data packet corresponding to the first message to obtain a data packet of the PHY layer corresponding to the first message. In the embodiment of the present 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. In the processing process of the data packet of one or more layers below the high layer, the first message adds a source layer II identifier and a destination layer II identifier into the data packet corresponding to the first message. The source layer two identifier and the destination layer two identifier are used for sending the first message.

For example, after the first terminal device generates the first message at the higher layer, the first message is encapsulated at the MAC layer, and a part of the source layer two identifier (for example, the upper 16 bits in the 24-bit layer two identifier of the first terminal device) and a part of the destination layer two identifier (for example, 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 two identifier may be the upper 8 bits in the layer two identifier of the second terminal device) are added in the data packet corresponding to the MAC layer. And after the data packet corresponding to the first message is encapsulated in the MAC layer, obtaining the data packet of the MAC layer. The MAC layer packet is transferred to the PHY layer, and is processed at the PHY layer, for example, in control information corresponding to the packet (packet of the MAC layer corresponding to the first message), a part of the source layer two identifier (for example, the lower 8 bits in the layer two identifier of the first terminal device) and a part of the destination layer two identifier (for example, the lower 16 bits in the 24 bits layer two identifier of the second terminal device) are added. It can be seen that the source layer two identifier and the destination layer two identifier are added in the data packet and the control information obtained after the processing of the MAC layer and the PHY layer.

That is, in the embodiment of the present application, with respect to 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.), a source identifier and a destination identifier of the message are used to send the message, where the source identifier of the message is a source end (a source end may also be referred to as a sending end), a layer two identifier (may also be referred to as a source layer two identifier in the embodiment of the present application), and a destination identifier of the message is a layer two identifier (may also be referred to as a destination layer two identifier in the embodiment of the present application) of a destination end (a destination end may also be referred to as a receiving end), and the source layer two identifier and the destination layer two identifier may be added in the process of encapsulating the message in a low layer. In the embodiment of the application, the source identifier and the destination identifier of the message are introduced by taking the first message as an example, and the destination identifiers and the content of the source identifiers of other messages are similar and are not repeated.

(5) Signaling radio bearers (signalling radio bearers, SRB).

A side-uplink radio bearer is a bearer for transmitting and receiving data or signaling of a side-uplink. The side-uplink radio bearer may include a packet data convergence protocol (packet data convergence protocol, PDCP) entity, a radio link control (radio link control, RLC) entity, or a Logical Channel (LCH), etc.

When a terminal device is to transmit one side-link Radio Bearer (RB), the terminal device needs to establish PDCP entity, RLC entity, and logical channel. Parameters for the transmission side uplink RB include PDCP configuration, RLC configuration, MAC configuration. On the sidelink, two radio bearers are included, one being a sidelink data radio bearer (data radio bearers, DRB) and the other being a sidelink signaling radio bearer (SL signalling radio bearers, SL SRB), the control plane data transmitted by the SL SRB comprising RRC messages and PC5-S messages on the PC5 interface. The SL SRB may be of various types, and may include, for example, SL SRB0, SL SRB1, SL SRB2, SL SRB3, SL SRB4, and the like.

In one possible implementation, the SL SRB may be set with the type of message it corresponds to that which can be transmitted.

For example, SL SRB0 may be used to transmit initial signaling in a side-uplink based communication process-related procedure, such as may be used to transmit a direct communication request message in a link setup procedure for V2X communication, and may be used to transmit a direct communication request message in a link setup procedure for ProSe direct communication. Such as SL SRB0, is used to transmit unprotected PC5-S messages.

As another example, SL SRB1, SL SRB2, SL SRB3 may be used to transmit other signaling than the initial signaling in the side-uplink based communication process related procedure, such as a message for security establishment in the link establishment procedure for V2X communication, and further such as a message for security establishment in the link establishment procedure for ProSe direct communication. For example, SL SRB1 may be used to transmit PC5-S messages (e.g., direct link security mode command messages and direct link security mode complete messages) that establish PC5-S security. SL SRB2 may be used to transmit protected PC5-S messages in addition to the direct link security mode completion. SL SRB3 is used to transmit PC5-RRC messages.

As another example, SL SRB4 may be configured to transmit discovery messages in a side-link based discovery process related procedure, such as may be configured to transmit discovery messages or request messages in a ProSe direct discovery link setup procedure, and may be configured to transmit discovery messages or request messages in a relay discovery link setup procedure.

In the embodiment of the application, in order to increase the number of the side-link processing services, the side-link between the first terminal equipment and the second terminal equipment can be configured with at least two carriers. On the other hand, in the case where at least two carriers are configured in the side link between the first terminal device and the second terminal device, if one carrier is randomly selected as the working carrier by both the first terminal device and the second terminal device, one carrier selected by the first terminal device for transmitting a message and one carrier selected by the second terminal device for listening may be largely different, which may cause the second terminal device to fail to receive the message from the first terminal device with a large probability. The scheme provided by the embodiment of the application can also improve the probability that the second terminal equipment receives the message sent by the first terminal equipment under the condition that at least two carriers are configured for the side uplink.

In a possible implementation, the first terminal device sends the target message on each of the N1 carriers based on the side-link, and the second terminal device listens on the N2 carriers. The N1 carriers and N2 carriers each belong to a carrier configured for side-links. N1 is a positive integer. N2 is a positive integer. In the embodiment of the present application, N1 may be an integer equal to 1 or greater than 1. N2 may be an integer equal to 1 or greater than 1. In yet another possible embodiment, N1 may be associated with N2, for example, when N1 is equal to 1, N2 is 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 one possible embodiment, N1 is an integer greater than 1. That is, in the case where at least two carriers are configured for the side uplink between the first terminal device and the second terminal device, the first terminal device may transmit the target message on at least two carriers therein. The second terminal device may monitor on one or more carriers of the at least two carriers, which is not limited by the embodiment of the present application. Because the first terminal equipment sends the target message on at least two carriers, compared with the scheme that the first terminal equipment sends the target message on only one carrier, the scheme provided by the embodiment of the application can improve the probability that the second terminal equipment receives the target message. It should be noted that, the at least two target messages are both used for discovering other terminal devices; or the at least two target messages are each used to request a link to be established with the second terminal device.

In yet another possible embodiment, N2 is an integer greater than 1. That is, in the embodiment of the present application, in the case where at least two carriers are configured for the side uplink between the first terminal device and the second terminal device, the second terminal device listens on at least two carriers therein. The first terminal device may send the target message on one or more carriers of the at least two carriers, which is not limited by the embodiment of the present application. Because the second terminal equipment monitors on at least two carriers, compared with the scheme that the second terminal equipment monitors on only one carrier, the scheme provided by the embodiment of the application can improve the probability that the second terminal equipment receives the target message.

In another possible implementation manner provided by the embodiment of the present application, the first terminal device sends the target message on a preset carrier, and the second terminal device monitors on the preset carrier. And configuring at least two carriers on a side uplink between the first terminal equipment and the second terminal equipment, and presetting the carriers as carriers in the at least two carriers. The working carriers of the first terminal equipment and the second terminal equipment comprise preset carriers, so that the probability of receiving the target message by the second terminal equipment can be improved by the scheme provided by the embodiment of the application.

The solution provided by the embodiments of the present application will be further described below in conjunction with the foregoing.

According to the content shown in fig. 1a, fig. 1b, fig. 1c, fig. 2a, fig. 2b, fig. 2c, fig. 2d and fig. 2e, fig. 3 illustrates a communication method based on a side link according to an embodiment of the present application. The communication method based on the side link provided by the embodiment of the application can be used for transmitting signaling/data. The method provided in fig. 3 may be applied to the aforementioned side-link communication procedure (e.g., fig. 2 a) or the aforementioned side-link discovery procedure (e.g., fig. 2b or fig. 2 c). In fig. 3, an example of the method performed by the first terminal device and the second terminal device is described. The solution executed by the first terminal device side in the embodiment of the present application may also be executed by a unit, a module or a chip inside the first terminal device, and the solution executed by the second terminal device side may also be executed by a unit, a module or a chip inside the second terminal device.

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

The first terminal device and the second terminal device in fig. 3 may be the two terminal devices in fig. 1a, for example the first terminal device and the second terminal device may be V2X UE1 and V2X UE2, respectively, wherein the first terminal device may be any one of the two terminal devices. The first terminal device and the second terminal device in fig. 3 may also be ProSe UE1 and ProSe UE2, respectively, wherein the first terminal device may be any one of ProSe UE1 and ProSe UE 2.

The first terminal device and the second terminal device in fig. 3 may be the two terminal devices in fig. 1b, e.g. 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 may be either of the two terminal devices.

The first terminal device and the second terminal device in fig. 3 may be two terminal devices in fig. 1c, for example, the first terminal device and the second terminal device may be a source terminal device and a relay terminal device, respectively, where the first terminal device may be any one of the two terminal devices. For example, the first terminal device and the second terminal device may be a relay terminal device and a destination terminal device, respectively, where the first terminal device may be any one of the two terminal devices.

As shown in fig. 3, the method includes:

in step 301, the first terminal device sends a target message on N1 carriers based on the side-links.

It should be noted 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 carrier of the N1 carriers. The target messages are all used for discovering other terminal devices; or the target message is used to request a link to be established with the second terminal device. When the first terminal device sends multiple target messages on multiple carriers, the embodiment of the application is described by taking the example that the target messages include the first message and the second message.

In the embodiment of the application, the set of N1 carriers used by the first terminal equipment for sending the target message is called a first carrier set. One or more carriers may be included in the first set of carriers. N1 may be a positive integer.

The first terminal device transmits at least one targeted message on each carrier of the first set of carriers. The target message is used to discover other terminal devices or request to establish a PC5 unicast link with other terminal devices. Since the side links between the terminal devices are on the PC5 interface at present, in the embodiment of the present application, the unicast link established between the terminal devices is referred to as a PC5 unicast link, and if the interface name used by the side links between the terminal devices changes, the name of the PD5 unicast link in the embodiment of the present application may also change accordingly, and for a clearer description, the embodiment of the present application is described taking the PC5 unicast link as an example.

In the embodiment of the present application, the target message may be a message in a related flow of a communication process based on a side uplink, for example, may be an initial message of the first terminal device for establishing a PC5 unicast link; the target message may also be a message in a procedure associated with a side-link based discovery process.

For example, the PC5 unicast link to be established by the first terminal device is a layer two link in the V2X communication unicast mode at the reference point of the PC5, and the target message may be an initial message in the link establishment procedure of the V2X communication, for example, may be a direct communication request message in fig. 2 a.

For another example, the PC5 unicast link to be established by the first terminal device is a layer two link in the ProSe communication unicast mode on the PC5 reference point, and the target message may be an initial signaling in a link establishment procedure of ProSe direct communication, for example, may be a direct communication request message.

As another example, the target message is used to discover other terminal devices. The target message may be initial signaling in the discovery process. For example, the target message may be the initial signaling in the link establishment procedure of ProSe direct discovery, for example, the target message may be the discovery message in step 211 in fig. 2b, and for example, the target message may be the request message in step 221 in fig. 2 c. The carriers in the first carrier set may be all or part of the carriers that ProSe directly finds the corresponding carriers.

For another example, the target message is an initial signaling in a link establishment procedure of relay discovery, and for example, the target message may be a discovery message or a request message. The carriers in the first set of carriers may be all or part of the carriers corresponding to the relay discovery.

In step 302, the first terminal device listens on N1 carriers for sending the target message.

In the embodiment of the present application, step 302 may be an optional step, for example, when the target message is the discovery message in fig. 2b, the first terminal device may not execute step 302.

In step 303, the second terminal device monitors carriers of the N2 carriers.

Optionally, step 303 may be performed simultaneously with step 301, or may be performed before or after step 301, where step 303 is performed before step 301, to facilitate the second terminal device receiving the target message from the first terminal device in time.

In the embodiment of the application, the set of N2 carriers monitored by the second terminal equipment can be called a second carrier set. One or more carriers may be included in the second set of carriers.

Step 304, the second terminal device receives at least one target message on a carrier of the N2 carriers.

On the other hand, since the first terminal device transmits the target message on at least two carriers (N1 may be greater than 1), and/or the second terminal device listens on at least two carriers (N2 may be greater than 1), the probability that there is an intersection between the carrier on which the first terminal device is configured to transmit the message and the carrier on which the second terminal device listens is improved, and thus the probability that the second terminal device receives the target message may be improved. For example, when the N1 carriers and the N2 carriers are identical, the probability of the second terminal device receiving the target message may be further improved.

In another possible implementation manner, in step 301, N1 carriers may support 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 ProSe service. The target message may include identification information of the first service. In this way, the target message may be used to discover other terminal devices interested in the first service. Alternatively, the target message may be used to request establishment of a PC5 unicast connection with other terminal devices interested in the first service.

For example, the carriers in the first carrier set may be all or part of carriers corresponding to ProSe Direct Discovery (Direct Discovery), in which case the first terminal device may be configured to send the Discovery message in a ProSe Direct Discovery process. For another example, the carriers in the first carrier set may be all or part of the carriers corresponding to the relay discovery, in which case the first terminal device may be configured to send the discovery message in the relay discovery procedure.

In yet another possible implementation, the N2 carriers may 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 comprise all or part of all carriers configured for the first service. In this way, the probability that N1 carriers and N2 carriers have an intersection can be improved, and then the probability that the second terminal device receives the target message can be improved. For example, when the N1 carriers and the N2 carriers are identical (or the first carrier set and the second carrier set are identical, for example, the first carrier set includes a ProSe direct discovery corresponding carrier set, and the second carrier set includes a ProSe direct discovery corresponding carrier set), the probability that the second terminal device receives the target message may be further improved.

In step 301 described above, the target message may be unicast, multicast or broadcast. The source and destination identifications of the target message are used to send the target message. For broadcasting, the destination identifier for sending the target message may be a destination identifier corresponding to the service. The service may be a V2X service, proSe service, for example. When the service includes V2X service, the destination identifier corresponding to the service may be a destination identifier corresponding to the V2X service type. The V2X service type is one type of V2X service identified by an intelligent transportation system application identifier (intelligent transport systems application identifier, ITS-AID), a provider service identifier (provider service identifier, PSID), or an application identifier AID (AID). When the service includes ProSe service, the destination identifier corresponding to the service may be a destination identifier corresponding to ProSe service (i.e., proSe identifier). The ProSe identifier may be a globally unique identifier for identifying ProSe applications associated with ProSe operations in 5G ProSe direct discovery and 5G ProSe direct communication. For unicast, the destination identification for sending the target message may include the identification of the receiving end device. For multicast, the destination identification for sending the target message may include a group destination layer 2 identification (group destination L2 ID).

In step 301 above, in the case where N1 is an integer greater than 1, there are many possible embodiments in which the first terminal device transmits at least two target messages on N1 carriers. Two possible embodiments are described below by way of example with reference to embodiment A1 and embodiment A2. When N1 is an integer greater than 1, the second terminal device may perform monitoring on one carrier, or may perform monitoring on at least two carriers, which is not limited in the embodiment of the present application. In the embodiment of the present application, the multi-label message includes a first message and a second message, and the N1 carriers include a first carrier and a second carrier. In practical applications, the number of target messages sent by the first terminal device and the number of carriers may be further increased, and related schemes are similar and will not be described again.

Embodiment A1

Fig. 4a schematically illustrates a possible communication method according to embodiment A1.

As shown in fig. 4a, the step 301 may be replaced by the step 401, and the step 401 may include a step 401a and a step 401b:

step 401a, a first terminal device sends a first message on a first carrier through a side uplink;

in step 401b, the first terminal device sends a second message on a second carrier via a side-uplink.

In step 402, the first terminal device monitors on a first carrier and monitors on a second carrier.

In step 403, the second terminal device monitors carriers of the N2 carriers.

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

Step 404, the second terminal device receives at least one target message on a carrier of the N2 carriers.

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

Because the first terminal device sends the message on the first carrier and the second carrier, the probability that the N2 carriers used for monitoring by the second terminal device and the carriers used for sending the message by the first terminal device (the first carrier and the second carrier) have intersection is improved, and then the probability that the second terminal device receives the message sent by the first terminal device can be improved.

It should be noted that, in the embodiment of the present application, there is no absolute relationship between N2 carriers and carriers (the first carrier and the second carrier) used by the first terminal device to send the message. In the scheme shown in fig. 4a, one or more carriers may be included in the N2 carriers, where at least one of the first carrier and the second carrier may be included in the N2 carriers, or the first carrier may not be included and the second carrier may not be included in the N2 carriers, which is not limited by the embodiment of the present application.

In one possible implementation of the above steps 401a and 401b, it may be understood that the first message is identical to the second message.

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

In embodiment A1, the first message and the second message may be understood as the same two messages, and the second message may be understood as a duplicate of the first message. In one possible implementation, a message Sequence number (Sequence number) may be included in each target message. In embodiment A1, the sequence numbers of the first message and the second message may be the same. And the opposite terminal can judge that the received first message and the received second message are the same two messages according to the message sequence number under the condition that the opposite terminal receives the multi-item label message.

In a possible implementation manner, a rule may be preset at the first terminal device side, where the rule includes: for the first message, the first terminal device may transmit a plurality of PDUs containing the first message on a plurality of logical channels. Wherein the first terminal device transmits at least one PDU containing the first message on one logical channel through one carrier in the first carrier set, and the two carriers used by the first terminal device on two different logical channels are different (which may also be described as that the two carriers corresponding to the two logical channels used by the first terminal device to transmit the two PDUs containing the first message are different).

In the embodiment of the application, the source identifier and the destination identifier of the message sent through the logic channel can be called as a pair of layer two identifier pairs corresponding to the logic channel, the source identifier in the layer two identifier pairs is the sender identifier of the logic channel, and the destination identifier in the layer two identifier pairs is the receiver identifier of the logic channel. When the first terminal device transmits the first message through the logical channel in the embodiment of the present application, the side uplink resource on the carrier in the first carrier set corresponding to the logical channel may be selected for the first message, and then the first terminal device uses the side uplink resource on the carrier to transmit the first message in the logical channel. Or, the first terminal device may transmit the first message of the logical channel by using a side grant (grant) on a carrier in the first carrier set corresponding to the logical channel.

In yet another possible implementation manner, in an embodiment of the present application, a message type corresponding to the SL SRB may be set for the SL SRB (for a specific setting example, refer to the foregoing description). For example, SL SRB0 may be used to transmit initial signaling in the link setup procedure of the communication procedure, the first terminal device may transmit a message of SRB0, or PDCP packet data convergence protocol (Packet Data Convergence Protocol, PDCP) protocol data unit (protocol data unit, PDU), via the rule, i.e. send multiple copies of the message of SRB0 via multiple logical channels.

Because the first terminal device copies the first message and sends the first message on at least two carriers, the number of messages generated by a higher layer (such AS a V2X layer, a ProSe layer, a PC5 signaling protocol layer, or a higher layer of an AS layer) on the side of the first terminal device can be reduced, so that the workload of the higher layer (such AS a V2X layer, a ProSe layer, a PC5 signaling protocol layer, or a higher layer of an AS layer) on the side of the first terminal device can be reduced.

In embodiment A1, the time when the first terminal device transmits the first message and the second message is not particularly limited, for example, the time when the first message is transmitted on the first carrier and the time when the second message is transmitted on the second carrier may be the same or different.

Embodiment A2

In embodiment A2, the first message and the second message may be two different target messages. That is, both the first message and the second message are generated by a higher layer of the first terminal device (such AS a V2X layer, proSe layer, PC5 signaling protocol layer, or a higher layer of the AS layer). The two tag messages differ in message Sequence number (Sequence number), but the two tag messages are used in the same way. Alternatively, it is also understood that the message sequence numbers of the two header messages are different, and the two header messages have the same content in two parts of the ProSe layer (or V2X layer).

For example, the first message and the second message are each used for requesting a PC5 unicast link for establishing V2X communication with other terminal devices.

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

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

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

The first terminal device may determine that there is an association between the first message and the second message, such as may be determined by the content of the first message and the second message.

Fig. 4b schematically illustrates a possible flow chart of a signaling/data transmission method based on a side-link in the embodiment A2, where in fig. 4b, at least two carriers including a first carrier and a second carrier are described as an example, in practical application, the number of carriers for the first terminal device to send the target message may be further increased, and related schemes are similar and will not be repeated.

As shown in fig. 4b, the above steps 301 and 302 may be replaced by the following:

in step 411, the first terminal device sends a first message on a first carrier via a side-uplink.

In step 412, the first terminal device listens on the first carrier.

In step 413, the second terminal device listens on a carrier of the N2 carriers.

The content of step 413 is the same as that 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 the other terminal devices is received within a preset first duration;

if a message is received from another terminal device (e.g., a second terminal device) in response to the first message, then step 415 is performed;

if not, step 416 is performed.

In step 415, the first terminal device performs signaling/data transmission with the second terminal device on the first carrier based on the side-uplink.

It should be noted that, when the first terminal device determines in step 414 that the message from the second terminal device in response to the first message is received within the preset first time period, in the foregoing step 413, the N2 carriers include one or more carriers, and the N2 carriers need to include the first carrier, so that, after step 411, the second terminal device may receive the first message on the first carrier, and the second terminal device sends the message in response to the first message to the first terminal device within the preset first time period (the content is not shown in fig. 4 b).

In another possible implementation manner, when the first terminal device determines in step 414 that the message from the second terminal device in response to the first message is not received within the preset first duration, in step 413, the N2 carriers include one or more carriers, and the N2 carriers may include the first carrier or may not include the first carrier, which is not limited in the embodiment of the present application. After step 411, the second terminal device may or may not receive the first message on the first carrier, which is not limited in the embodiment of the present application.

The first terminal device sends a second message on a second carrier via the side-link, step 416.

In step 417, the first terminal device listens on the second carrier.

If the first terminal device receives a message, such as a direct communication accept message, from another terminal device on the second carrier in response to the first message, where the first terminal device is preset for a duration (the duration may be the first duration or may be a duration unequal to the first duration, and the embodiment of the present application is not limited, and the scheme may be simpler when the duration is the first duration), the first terminal device may perform signaling/data transmission with the second terminal device based on the side uplink on the second carrier.

If a message from another terminal device in response to the first message is not received on the second carrier within a preset duration (the duration may be the first duration or may be a duration not equal to the first duration, where the duration is the first duration and the scheme may be simpler), if the first carrier set further includes another carrier, the first terminal device may further continue to send a message for discovering another terminal device or requesting to establish a side uplink with another terminal device on another carrier in the first carrier set.

Because the first terminal device sends the message on the first carrier and the second carrier, the probability that the second terminal device monitors that the intersection exists between the N2 carriers and the carriers (the first carrier and the second carrier) used by the first terminal device to send the message is improved, and then the probability that the second terminal device receives the message sent by the first terminal device can be improved.

In a possible implementation manner, a rule may be preset at the first terminal device side, where the rule includes: for a plurality of target messages (such as a first message and a second message), the first terminal device transmits the target message on a plurality of different carriers. Wherein the first terminal device transmits at least one first message over one carrier of the first set of carriers and the first terminal device transmits at least one second message over another carrier of the first set of carriers.

The SL SRB may also be set with a corresponding message type that may be transmitted in the embodiment of the present application (for a specific setting example, see the foregoing description). For example, SL SRB0 may be used to transmit the initial signaling in the link establishment procedure of the communication procedure, and the first terminal device may transmit the message (or PDU) of SRB0 according to the rule, i.e. send the message of SRB0 according to the rule described above.

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 the SL SRB0, the first terminal device may select a resource on one carrier (such as the first carrier) in the first carrier set when selecting a side uplink resource for data (including data of the first message) of the first logical channel corresponding to the SL SRB 0; alternatively, data of the first logical channel corresponding to SL SRB0 (i.e., data including the first message) is transmitted using a side uplink grant (grant) on one carrier of the first carrier set (e.g., the first carrier).

When the first terminal device needs to send the second message, the second message is transmitted through the SRB0, 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, and the source identifier of the second message is the same as the source identifier of the first message), so that when the first terminal device selects the side uplink resource for the data (including the data of the second message) of the first logical channel corresponding to the SL SRB0, the first terminal device selects the resource on another carrier (a carrier different from the first carrier selected before, such as the second carrier); or, the data of the first logical channel corresponding to the SL SRB0 (i.e. the data containing the second message) is transmitted by using a side uplink grant (grant) on another carrier (such as the second carrier) in the first carrier set, so that the purpose that the first terminal device sends the first message and the second message respectively through at least two different carriers in turn is achieved.

As can be seen from the foregoing, in embodiment A2, since the first terminal device can transmit at least two target messages on at least two carriers, the probability of receiving the target messages by the second terminal device can be improved.

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 in one time period, so that the capability requirement on the first terminal device can be reduced, and the terminal device which has no capability to send a plurality of messages on at least two carriers simultaneously is also applicable to the scheme provided by the embodiment of the application.

It should be noted that, in fig. 4b, the first terminal device sends the target message on the first carrier and the second carrier in turn, and in practical application, the first terminal device may also send the target message on more carriers in turn, and the related scheme is similar to the above, and will not be repeated. In addition, the logical channel in the embodiment of the present application may be any one of the corresponding logical channels of SL SRB0, SL SRB1, SL SRB2, SL SRB3, and unicast DRB. Some examples of the embodiment of the present application are described by taking SL SRB0 as an example, and when applicable to different scenes, since it may be specified that the SRBs used for signaling in different application scenes may be different, when the example of SRB0 in the embodiment of the present application is applied to other scenes, SRB0 may be replaced by other SRBs as needed. For example, when the application scenario related to the example of SRB0 in the embodiment of the present application is replaced by the discovery process scenario, SRB0 may be replaced by SRB4 correspondingly, and the related content is similar to the same, and will not be described again.

In step 303, the second terminal device may perform monitoring on one carrier, or may perform monitoring on at least two carriers. Various embodiments are also possible for the second terminal to monitor at least two carriers, as exemplified below by embodiments B1, B2. The embodiment of the application is described by taking the example that the N2 carriers include a first carrier and a second carrier.

Embodiment B1

Fig. 5a illustrates one possible side-link based signaling/data transmission scheme in embodiment B1, as shown in fig. 5a, the method includes:

in step 501, the first terminal device sends a target message on N1 carriers based on the side-links.

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

In step 502, the first terminal device listens on N1 carriers for sending the target message.

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

In step 503, the second terminal device monitors on the first carrier and monitors on the second carrier.

The above step 503 may be regarded as one possible implementation of the above step 303.

In step 504, the second terminal device receives the target message on the first carrier and/or the second carrier.

The above step 504 may be considered as one possible implementation of the above step 304.

Since the second terminal device monitors on at least two carriers, the probability that there is an intersection between at least two carriers (the first carrier and the second carrier) used for monitoring by the second terminal device and N1 carriers used for transmitting messages by the first terminal device is improved, and then the probability that the message transmitted by the first terminal device is received by the second terminal device can be improved.

It should be noted that, in the scheme shown in fig. 5a, one or more carriers may be included in the N1 carriers, where at least one of the first carrier and the second carrier may be included in the N1 carriers, or the first carrier may not be included and the second carrier may not be included, which is not a limitation of the embodiment of the present application.

When the second terminal device listens on at least two carriers, for example, the scheme provided in embodiment B1 is executed, 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, the implementation B1 may be used in combination with the foregoing implementation A1, in which case, since the first terminal device sends the first message and the second message through at least two carriers, the second terminal device may receive the message on only one carrier, or may receive multiple messages on at least two carriers.

For example, the second terminal device may only receive the second message on the second carrier, in which case the second terminal device may 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 may select one carrier (e.g., a carrier that may select the earliest received first message) from the first carrier and the second carrier for sending the message to the first terminal device. For example, the second terminal device may determine whether the first message and the second message are identical according to the message sequence number, for example, if the second terminal device determines that the message sequence number in the first message is identical to the message sequence number of the second message, it may determine that the first message and the second message are identical; conversely, in the case that 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 identical, it may be determined that the first message and the second message are not identical.

In yet another possible embodiment, embodiment B1 may be used in combination with the foregoing embodiment A2. For example, the second terminal device may receive the first message on the first carrier, and the second terminal device may use the first carrier as a carrier for subsequent communication with the first terminal device. The second terminal device may receive 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. Or the second terminal device receives the second message on the second carrier, and takes the second carrier as a carrier for subsequent communication with the first terminal device. In this embodiment, the second terminal device may not need to determine whether the first message and the second message are the same message.

For another example, the second terminal device may not receive the first message on the first carrier, but may receive the second message on the second carrier, in which case the second terminal device may use the second carrier as a carrier for subsequent communication with the first terminal device. Further, the second terminal device may return a message to the first terminal device through the second carrier, and the first terminal device may stop sending other target messages after the second carrier receives the message, and may use the second carrier as a carrier for subsequent communication with the first terminal device.

Embodiment B2

In embodiment B2, in step 303, the second terminal device may monitor at least two carriers in turn.

Fig. 5B illustrates one possible side-link based signaling/data transmission scheme in embodiment B2, as shown in fig. 5B, the method includes:

in step 511, the second terminal device listens on the first carrier.

Step 512, the second terminal device determines whether a message of a side uplink from other terminal devices is received on the first carrier within a preset second duration;

if so, step 513 is performed;

if not, step 514 is performed.

The second time period may or may not be equal to the first time period.

In step 513, the second terminal device performs signaling/data transmission with the first terminal device on the first carrier based on the side-uplink.

It should be noted that, if in step 512 the second terminal device receives the side-link message from the other terminal devices on the first carrier within the preset second duration, the first terminal device sends the message at least on the first carrier before step 512, where the scheme of fig. 5b is combined with the scheme shown in fig. 3, where N1 is 1 or an integer greater than 1, and N1 carriers include at least the first carrier.

In another possible implementation, if in step 512 the second terminal device does not receive the side-link message from the other terminal device on the first carrier within the preset second duration, the first terminal device may send the message on the first carrier or may not send the message on the first carrier before step 512, which is not limited by the embodiment of the present application. In combination with the solution shown in fig. 3, where N1 is 1 or an integer greater than 1, the N1 carriers may or may not include the first carrier, which is not limited in the embodiment of the present application.

In step 514, the second terminal device listens on the second carrier.

Similarly, the second terminal device determines whether a message of the side link from the other terminal device is received on the second carrier within a preset period of time (such as the second period of time), for example, in order to establish an initial message of the PC5 unicast link or a message in a related procedure of a discovery process based on the side link, if the message is received (such as the first message or the second message), the second terminal device may perform signaling/data transmission with the first terminal device based on the side link on the second carrier. The scheme shown in fig. 5b may also be regarded as one possible implementation of the above-mentioned steps 303 and 304. The first terminal device side may perform the related schemes shown in the foregoing step 301 and step 302, which are not shown and defined in fig. 5 b.

The second terminal equipment can monitor on at least two carriers in turn, so that the second terminal equipment can monitor on one carrier in a time period, the capability requirement on the second terminal equipment can be reduced, and the terminal equipment which has no capability and monitors on at least two carriers simultaneously is also applicable to the scheme provided by the embodiment of the application.

When the second terminal device listens on at least two carriers, for example, the scheme provided in embodiment B2 is executed, 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 embodiment, embodiment B2 may be used in combination with the foregoing embodiment A1, where the probability that the second terminal device receives the first message on the carrier may be increased, since the first terminal device sends the first message and the second message on at least two carriers, respectively, and since the second terminal device may alternately monitor on the first carrier and the second carrier.

In yet another possible implementation manner, the implementation manner B2 may be used in combination with the foregoing implementation manner A2, where 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 since the second terminal device may monitor on the first carrier and the second carrier in turn, compared to a scheme in which the first terminal device sends the message through only one carrier and the second terminal device monitors on only one carrier, the scheme provided by the embodiment of the present application may improve the probability that the second terminal device receives the target message on the carrier.

Based on what is shown in any of the embodiments of fig. 3, 4a, 4b, 5a and 5b described above, fig. 6a illustrates a further possible method flow diagram for side-link based signaling/data transmission.

As shown in fig. 6a, the method comprises:

in 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 should be noted that, when the scheme shown in fig. 6a is used in combination with the scheme shown in fig. 3, the step 601 in fig. 6a needs to be performed after the step 304 in the scheme shown in fig. 3, and in the scheme shown in fig. 6a, the second carrier is included in the N1 carriers in the step 301, and the second carrier is also included in the N2 carriers in the step 303.

On the other hand, in step 304, in case the second terminal device receives the target message on one carrier (such as the second carrier), the second terminal device may send the third message on the carrier (such as the second carrier). In the case that the second terminal device receives a plurality of target messages on at least two carriers, the second terminal device may select one carrier from the at least two carriers to send the third message, for example, may select randomly, or may select the carrier that receives the target message earliest. In fig. 6a, an example is illustrated in which the second terminal device selects the second carrier to transmit the third message.

In case the target message may be a message in the course of a communication, e.g. the target message is the direct communication request message in fig. 2a, in which case the third message may be the secure establishment procedure message in fig. 2a or the direct communication accept message in fig. 2 a.

For another example, the target message is a direct communication request message in a link establishment procedure of ProSe direct communication, and the third message may be a secure establishment procedure message in the link establishment procedure of ProSe direct communication or a direct communication acceptance message in the link establishment procedure of ProSe direct communication.

In the case where the target message may be a message in the discovery process, for another example, the target message is a request message in the ProSe direct discovery link establishment procedure, and the third message may be a response message of the request message in the ProSe direct discovery link establishment procedure.

For another example, the target message may be a request message in the link establishment procedure of the relay discovery, and the third message may be a response message of the request message in the link establishment procedure of the relay discovery.

In step 602, the second terminal device determines the second carrier as a carrier for transmitting signaling/data with the first terminal device.

In the embodiment of the present application, when the scheme shown in fig. 6a is used in combination with the scheme shown in fig. 3, step 602 may be performed after step 304 and before step 601, or may be performed after step 601, which is not limited to the embodiment of the present application.

In step 603, the second terminal device listens on the second carrier.

In 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 on the second carrier based on the side-link.

In the case where the target message may be a message in the communication process, for example, the target message is a direct communication request message in fig. 2a, the third message is a message for establishing security, and the fourth message may be a message for establishing security.

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

As can be seen from the scheme shown in fig. 6a, the second terminal device may determine, from one or more carriers that receive the target message, a carrier, such as a second carrier, for subsequent transmission of the message with the first terminal device, and 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, after the second carrier receives the third message from the second terminal device, the second carrier as a carrier for transmission of the message with the second terminal device. Since the second terminal device monitors 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 successfully received by the second terminal device with a high probability.

That is, after determining a carrier (such as the second carrier) for subsequent transmission of the message between the first terminal device and the second terminal device, the first terminal device may not need to transmit the message on multiple carriers, but may only transmit the message on the second carrier, so that the message may be successfully received by the second terminal device with a high probability. And because the first terminal equipment can not need to send the message on a plurality of carriers when sending the message to the second terminal equipment, the power consumption and the communication resource can be saved.

It should be noted that, in the embodiment of the present application, the first terminal device may execute the discovery process first and then perform the communication process. For example, a first terminal device performs ProSe direct discovery and performs ProSe direct communication with a 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 manner, the first terminal device may use the relevant content of the discovery process in the scheme shown in fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b or fig. 6a in the discovery process. The first terminal device may also employ the related content scheme of the communication process in the schemes of fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b or fig. 6 a.

In yet another possible implementation manner, the first terminal device may use the content related to the discovery process in the scheme shown in fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, or fig. 6a, and then may perform the communication process based on the selected carrier (such as the second carrier).

It should be noted that, in this embodiment, if the first terminal device adopts the scheme shown in fig. 2b, in this embodiment, the target message may be a discovery message, the third message may be an initial message for establishing a PC5 unicast link (such as a V2X communication PC5 unicast link or a ProSe direct communication PC5 unicast link) for the first terminal device and the second terminal device, for example, the third message may be a direct communication request message, and the fourth message may be a security establishment procedure message.

In this embodiment, if the first terminal device adopts the scheme shown in fig. 2c, in this embodiment, the target message may be a request message, and the third message may be a response message of the request message. The fourth message may be an initial message for establishing a PC5 unicast link (such as a V2X communication PC5 unicast link or a ProSe direct communication PC5 unicast link) for the first terminal device and the second terminal device, such as the fourth message may be a direct communication request message.

Fig. 6b illustrates another schematic diagram of the method flow of fig. 6a, where, as illustrated in fig. 6b, the first terminal device sends DCR on the first carrier and the second carrier, respectively, the second terminal device receives DCR on the second carrier, and sends a third message (the third message may be a message for establishing security) to the first terminal device on the second carrier, and the first terminal device sends a fourth message (the fourth message may be a message for establishing security) to the second terminal device on the second carrier.

In light of the above, fig. 7 illustrates a schematic flow diagram of yet another possible side-link based signaling/data transmission. The method shown in fig. 7 may be performed by the first terminal device or may be performed by the second terminal device, and the scheme of performing fig. 7 by the first terminal device is described below as an example.

As shown in fig. 7, the method includes:

in step 701, the first terminal device determines an association relationship one. The first association relation comprises an association relation between the destination identifier and the carrier, or comprises an association relation between the source identifier, the destination identifier and the carrier.

In step 702, the first terminal device sends a message three according to the association relationship.

The source and destination identifications of message three are used to send message three. The source identifier corresponding to the message three comprises a layer two identifier of the sending end of the message three, namely a layer two identifier of the first terminal device. The destination identifier corresponding to the message three comprises a layer two identifier of the receiving end of the message three. For easy distinction, the receiving end of the message three is taken as the second terminal device for example. The destination identifier corresponding to the message three comprises a layer two identifier of the second terminal device.

In a possible implementation manner, after the first terminal device generates the message three, it may determine whether the corresponding destination identifier (or, the source identifier and the destination identifier) of the message three (may be referred to as data to be transmitted) is associated with a carrier.

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

For another example, the first terminal device determines that the destination identifier (or the source identifier and the destination identifier) of the message three has an associated carrier, and when the side uplink resource is selected for the message three, the resource on the carrier associated with the destination identifier (or the source identifier and the destination identifier) can be selected, or the side uplink grant (grant) on the carrier associated with the destination identifier (or the source identifier and the destination identifier) is used to transmit the message three, so that the purpose of transmitting the message three on the carrier associated with the destination identifier (or the source identifier and the destination identifier) is achieved.

In yet another possible implementation, the first terminal device may further determine whether the source identifier (or, the destination identifier and the source identifier) of the fourth message (i.e., the data received by the first terminal device from the second terminal device) is associated with a carrier.

For example, the first terminal device determines that the source identifier (or the destination identifier and the source identifier) of the message four is associated with a carrier, and associates a second carrier for the source identifier (or the destination identifier and the source identifier) of the message four, where the second carrier is the carrier where the message four is located. If the destination identifier of the subsequent transmission data is the source identifier of the message four (or the destination identifier of the subsequent transmission data is the source identifier of the message four and the source identifier of the subsequent transmission data is the destination identifier of the message four), when the side link resource is selected for the subsequent transmission data, the resource on the second carrier may be selected, or the side link grant (grant) on the second carrier may be used to transmit the subsequent transmission data.

In the embodiment of the application, the logic channel can correspond to the source identifier and the destination identifier, the source identifier of the logic channel can be the layer two identifier of the transmitting end of the data of the logic channel, and the destination identifier of the logic channel can be the layer two identifier of the receiving end of the data of the logic channel. For example, the first terminal device may set the destination identifier of a logical channel (such as a second logical channel) for transmitting a message to the second terminal device to be the layer two identifier of the second terminal device, and set the source identifier of the logical channel to be the layer two identifier of the first terminal device. The second logical channel may be any one of corresponding logical channels of SL SRB0, SL SRB1, SL SRB2, SL SRB3, unicast DRB, and SL SRB 4. Further, the first terminal device may determine whether a carrier is associated with a destination identifier (or, a source identifier and a destination identifier) corresponding to a second logical channel (or data to be transmitted on the second logical channel) for transmitting a message to the second terminal device, and if the carrier is not associated with the destination identifier, associate the second carrier with the destination identifier (or, the source identifier and the destination identifier) corresponding to the second logical channel (which may also be understood as associating the second carrier with the logical channel). The second carrier may be a carrier on which a message four of the first terminal device is located, where a source identifier of the message four is a destination identifier corresponding to the second logical channel (or, a source identifier of the message four is a destination identifier corresponding to the second logical channel and a destination identifier of the message four is a source identifier corresponding to the second logical channel).

For a destination identifier (or a source identifier and a destination identifier) corresponding to a logical channel or a MAC medium access control (Medium Access Control, MAC) Control Element (CE), if the destination identifier (or the source identifier and the destination identifier) is associated with a carrier, when a side link resource is selected for the logical channel or the MAC CE, a resource on the carrier associated with the destination identifier (or the source identifier and the destination identifier) may be selected, or a side link grant (grant) on the carrier associated with the destination identifier (or the source identifier and the destination identifier) may be used to transmit the logical channel or the MAC CE, so as to achieve the purpose of transmitting the logical channel or the MAC CE on the carrier associated with the destination identifier (or the source identifier and the destination identifier).

The scheme provided in fig. 7 in the embodiment of the present application may be executed alone, or may be used in combination with the methods provided in fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, and fig. 6 a. For example, when the scheme of fig. 7 is used in combination with the method provided in fig. 6a, the first terminal device side may use the method provided in fig. 7, the fourth message may be regarded as the third message in fig. 7, and the third message may be regarded as the fourth message. Prior to the foregoing step 604, the first terminal device may execute the scheme provided in the foregoing step 701, which specifically includes:

The first terminal device may determine a first association relationship. The first association relation comprises an association relation between the destination identifier and the carrier, or comprises an association relation among the source identifier, the destination identifier and the carrier. When the first terminal device side executes the scheme of the first terminal device side, the first association relationship may be the first association relationship.

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

That is, when the first terminal device subsequently transmits a message (such as the fourth message), it may determine a carrier associated with the destination identifier for transmitting the message, or determine a carrier associated with the destination identifier and the source identifier for transmitting the message, and then transmit the message through the carrier. The first terminal device may select resources on the carrier for transmitting the message. The first terminal device may send the message using a side-uplink grant on the carrier.

For convenience of description, an example is introduced below, where the first association relationship includes: the first destination identifies an association with the second carrier. Alternatively, the first association relationship includes: the association relation of the first source identifier, the first destination identifier and the second carrier wave. The first source identifier comprises a layer two identifier of the first terminal device. The first destination identifier comprises a layer two identifier of the second terminal device.

Assuming that the source identifier corresponding to the second logical channel is the layer two identifier of the first terminal device, the destination identifier corresponding to the second logical channel is the layer two identifier of the second terminal device, and the second logical channel is the logical channel used by the first terminal device to send a message to the second terminal device. Since the first terminal device receives the third message from the second terminal device on the second carrier, the association relationship between the layer two identifier of the second terminal device (or the layer two identifier of the first terminal device and the layer two identifier of the second terminal device) and the second carrier can be established. In step 604, the first terminal device generates a fourth message, where the source identifier of the fourth message is the source layer two identifier of the first terminal device, and the destination identifier of the fourth message is the destination layer two 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 that the layer two identifier of the second terminal device (or the layer two identifier of the first terminal device and the layer two identifier of the second terminal device) has an association relationship with the second carrier, so that the first terminal device selects a resource on the second carrier, or uses a side uplink grant (grant) on the second carrier to transmit the fourth message. It may also be understood that the first terminal device determines, according to the first association relationship, that the carrier for transmitting the fourth message is the second carrier, and then sends the fourth message to the second terminal device through the second carrier.

In yet another possible implementation, the scheme of fig. 7 is used in combination with the method provided in fig. 6a, and the second terminal device side may also use the method provided in fig. 7, and when the second terminal device performs the scheme provided in fig. 7, the third message may be regarded as a message three, and the target message may be regarded as a message four. Specifically, the second terminal device side executes the scheme provided in step 701, and the specific content may include:

the second terminal device may determine a second association relationship. The second association relationship comprises an association relationship between the destination identifier and the carrier, or comprises an association relationship among the source identifier, the destination identifier and the carrier. When the second terminal device side executes the scheme of the first terminal device side, the second association relationship may be the first association relationship.

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

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

For convenience of description, an example is introduced below, where the second association relationship includes: the second destination identifies an association with the second carrier. Alternatively, the second association relationship includes: and the association relation of the second source identifier, the second destination identifier and the second carrier wave. The second source identifier includes a layer two identifier of the second terminal device. The second destination identifier comprises a layer two identifier of the first terminal device.

In the case where the scheme of fig. 7 is used in combination with the method provided in fig. 6a, in the above step 601, the second terminal device may first determine whether the source identifier and the destination identifier for transmitting the third message are associated with a carrier when the third message needs to be transmitted, and if not. The second terminal device may establish the association between the layer two identifier of the first terminal device (or the layer two identifier of the first terminal device and the layer two identifier of the second terminal device) and the second carrier, because 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 a plurality of carriers (including the second carrier), and the second terminal device determines that the second carrier is a carrier for performing data transmission with the first terminal device, or because the second carrier is a preset carrier for transmitting the message between the second terminal device and the first terminal device, which is preset). The second terminal equipment generates a third message, the source identifier of the third message is the layer two identifier of the second terminal equipment, and the destination identifier of the third message is the layer two identifier of the first terminal equipment. The second terminal device may select a resource on the second carrier associated with the layer two identity of the first terminal device (or the layer two identity of the first terminal device and the layer two identity of the second terminal device) when sending the third message, or transmit the third message using a side uplink grant (grant) on the second carrier.

It should be noted that, the second association relationship is established by the second terminal device side, and the related scheme using the second association relationship may refer to the foregoing first association relationship established by the first terminal device side, and the related description using the first association relationship is not repeated herein.

The step of determining the second association relationship by the second terminal device may be performed before the step 601, or may be performed after the step 601, which is not limited by the embodiment of the present application. The association relationships (such as the first association relationship and the second association relationship) mentioned in the embodiment of the application may also be referred to as corresponding relationships, where the first association relationship may be replaced by the first corresponding relationship, and the second association relationship may be replaced by the second corresponding relationship.

Fig. 8 is a schematic flow diagram illustrating a signaling/data transmission method based on a side link according to an embodiment of the present application according to the foregoing description shown in fig. 1a, fig. 1b, fig. 1c, fig. 2a, fig. 2b, fig. 2c, fig. 2d, and fig. 2 e. This method is illustrated by way of example in fig. 8 as being performed by the first terminal device and the second terminal device. The solution executed by the first terminal device side in the embodiment of the present application may also be executed by a unit, a module or a chip inside the first terminal device, and the solution executed by the second terminal device side may also be executed by a unit, a module or a chip inside the second terminal device. The first terminal device and the second terminal device may be the two terminal devices in fig. 1a, fig. 1b, or fig. 1c, and the relevant content is similar to that of fig. 3, and will not be described again.

As shown in fig. 8, the method includes:

in step 801, the first terminal device sends a target message on a preset carrier. The preset carrier is a carrier of at least two carriers of the side-uplink configuration.

Step 802, the first terminal device monitors on a preset carrier.

In step 803, the second terminal device monitors on a preset carrier.

Optionally, step 803 may be performed simultaneously with step 801, or may be performed before or after step 801, where step 803 is performed before step 801, to facilitate the second terminal device receiving the target message from the first terminal device in time.

In step 804, the second terminal device receives the target message on a preset carrier.

Further, after step 804, the method may further include:

in step 805, the second terminal device sends a third message to the first terminal device on a preset carrier.

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

In the embodiment of the present application, when at least two carriers are configured for the side uplink, one preset carrier may be preset. Compared with the scheme that the first terminal equipment randomly selects one carrier to send the target message and the second terminal equipment randomly selects one carrier to monitor, the target message is sent by the first terminal equipment on the preset carrier and the target message is received by the second terminal equipment on the preset carrier, so that the probability of the target message from the first terminal equipment received by the second terminal equipment can be improved.

The preset carrier in the embodiment of the present application may also be referred to as a default carrier. The relevant content of the target message in the embodiment of the present application may be referred to the relevant description in fig. 3, and will not be described herein.

The preset carrier wave in the embodiment of the application can be used for signaling/data transmission of the side uplink. For example, the preset carrier may transmit signaling for discovering other terminal devices, may transmit signaling for requesting to establish a unicast link with other terminal devices, and may also transmit signaling/data after unicast connection establishment.

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

The scheme provided in fig. 8 may be used in combination with the scheme provided in fig. 7 described above. For example, in step 801, when the first terminal device needs to send the target message, it may first determine whether a carrier is associated with a source identifier and a destination identifier for sending the target message, and if not, it may associate a preset carrier corresponding to the determined target message with the source identifier and the destination identifier for sending the target message. The first terminal device may then select resources on the associated pre-set carrier when sending the target message, or transmit the target message using a side-uplink grant (grant) on the pre-set carrier.

For another example, in step 801, when the first terminal device needs to send the target message, it may first determine whether the source identifier and the destination identifier of the logical channel for sending the target message are associated with carriers, and if not, may associate the preset carrier corresponding to the determined target message with the source identifier and the destination identifier of the logical channel. Then, when the first terminal device needs to send the target message through the logical channel, the first terminal device may select a resource on a preset carrier associated with the logical channel, or use a side uplink grant (grant) on the preset carrier to transmit the target message on the logical channel.

In the step 805, the second terminal device may first determine whether the source identifier and the destination identifier for sending the third message are associated with carriers when the third message needs to be sent, and if not, may associate the predetermined carrier corresponding to the determined third message with the source identifier and the destination identifier for sending the third message. Then, the second terminal device may select a resource on the associated preset carrier or transmit the third message using a side uplink grant (grant) on the preset carrier when transmitting the third message.

In the step 805, the second terminal device may first determine whether the source identifier and the destination identifier of the logical channel for sending the third message are associated with carriers when the third message needs to be sent, and if not, may associate the predetermined carrier corresponding to the determined third message with the source identifier and the destination identifier of the logical channel. Then, when the second terminal device needs to send the third message through the logical channel, the second terminal device may select a resource on a preset carrier associated with the logical channel, or use a side uplink grant (grant) on the preset carrier to transmit the third message on the logical channel.

In step 806, if the first terminal device needs to send the fourth message, it may first determine whether the source identifier and the destination identifier for sending the fourth message are associated with a carrier. Since the source identifier and the destination identifier for transmitting the target message are already associated with the preset carrier corresponding to the target message when the target message is transmitted, and the source identifier for transmitting the fourth message is the same as the source identifier for transmitting the target message and the destination identifier for transmitting the fourth message is the same as the destination identifier for transmitting the target message, the carrier associated with the source identifier and the destination identifier for transmitting the fourth message, that is, the preset carrier corresponding to the target message. The second terminal device needs to select the resources on the associated preset carrier or use the side uplink grant (grant) on the preset carrier to transmit the fourth message.

In step 806, if 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 for transmitting the target message have been associated with the preset carrier corresponding to the target message when the target message is transmitted, and the source identifier of the logical channel for transmitting the fourth message is identical to the source identifier of the logical channel for transmitting the target message, the destination source identifier of the logical channel for transmitting the fourth message is identical to the destination identifier of the logical channel for transmitting the target message, the carrier to which the source identifier and the destination identifier of the logical channel for transmitting the fourth message are associated, that is, the preset carrier corresponding to the logical channel for transmitting the target message. The second terminal device needs to select the resource on the preset carrier associated with the logical channel, or use the side uplink grant (grant) on the preset carrier to transmit the fourth message on the logical channel.

In still another possible implementation manner, in the embodiment of the present application, in the step 801, in a case where the first terminal device determines that the source identifier and the destination identifier of the logical channel for sending the target message are not associated with carriers, the first terminal device may not need to associate the preset carrier with the logical channel, but may maintain the state of the source identifier and the destination identifier of the logical channel in which carriers are not associated. In a possible implementation manner, when the first terminal device determines that the source identifier and the destination identifier of the logical channel for sending the target message are not associated with carriers, the first terminal device sends the target message by using a preset carrier.

In step 805, similarly, in the case where the second terminal device determines that the source identifier and the destination identifier of the logical channel for transmitting the third message are not associated with carriers, the second terminal device may not necessarily associate the preset carrier with the logical channel, but may maintain the state of the source identifier and the destination identifier of the logical channel in which carriers are not associated. In a possible implementation manner, when the second terminal device determines that the source identifier and the destination identifier of the logical channel for sending the third message are not associated with the carrier, the second terminal device sends the third message by using a preset carrier.

In step 806, similarly, in the case where the first terminal device determines that the source identifier and the destination identifier of the logical channel for sending the fourth message are not associated with carriers, the first terminal device may not necessarily associate the preset carrier with the logical channel, but maintain the state of the source identifier and the destination identifier of the logical channel in which carriers are not associated. In a possible implementation manner, when the first terminal device determines that the source identifier and the destination identifier of the logical channel for transmitting the fourth message are not associated with carriers, the first terminal device transmits the fourth message by using a preset carrier.

The association relationship between the source identifier and the destination identifier of the logical channel and the carrier related to the above content may be replaced by the association relationship between the destination identifier and the carrier of the logical channel, that is, the association relationship may not include the source identifier, the related scheme is similar to the above content, and the related content may be referred to the related description of fig. 7 and will not be repeated.

It should be noted that after the PC5 unicast connection is established between the first terminal device and the second terminal device, the first terminal device and the second terminal device may update/modify/configure/release/activate/deactivate the carrier used for the side-link signaling/data transmission between the first terminal device and the second terminal device. When the first terminal device updates/modifies/configures/releases/activates/deactivates the carrier used for performing the side link signaling/data transmission between the first terminal device and the second terminal device, the first terminal device needs to update the carrier associated with the destination identifier (or the source identifier and the destination identifier) of the logical channel used for performing the side link signaling/data transmission between the first terminal device and the second terminal device, for example, the first terminal device may associate the updated/modified/configured/activated carrier with the destination identifier (or the source identifier and the destination identifier) of the logical channel, and delete the released/deactivated carrier from the carrier associated with the destination identifier (or the source identifier and the destination identifier) of the logical channel.

Fig. 9a illustrates a flow chart of a signaling/data transmission method based on a side uplink according to an embodiment of the present application according to the foregoing descriptions shown in fig. 1a, fig. 1b, fig. 1c, fig. 2a, fig. 2b, fig. 2c, fig. 2d, and fig. 2 e. This method is illustrated in fig. 9a by way of example by the first terminal device and the second terminal device. The solution executed by the first terminal device side in the embodiment of the present application may also be executed by a unit, a module or a chip inside the first terminal device, and the solution executed by the second terminal device side may also be executed by a unit, a module or a chip inside the second terminal device. The first terminal device and the second terminal device may be the two terminal devices in fig. 1a, fig. 1b, or fig. 1c, and the related content is similar to the related content in fig. 3, and will not be described again.

As shown in fig. 9a, the method comprises:

in step 901, the first terminal device acquires second indication information, where the second indication information indicates one or more second time periods.

The second indication information may be preconfigured or network device configured. In the 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 well defined by a protocol. If the first terminal device obtains the second indication information from the network device, the first terminal device may obtain the second indication information through control signaling. The control signaling carries second indication information, or the second indication information is configured by the control signaling. The control signaling may be any one of a radio resource control (radio resource control, RRC) message, a medium access layer signaling, a medium access layer control element (medium access control control element, MAC CE), a system information block (system information block, SIB), or a master information block (master information block, MIB).

In step 902, the first terminal device operates on a third carrier for a second period of time.

The first terminal device operating on the third carrier during the second period of time may be understood as: the first terminal device performs at least one of the following for one or more second time periods: the first terminal equipment monitors on a third carrier; or, the first terminal device transmits the message based on the side-uplink on the third carrier.

In step 903, the first terminal device obtains first indication information, where the first indication information indicates one or more first time periods.

The first indication information may be preconfigured or configured by the network device, and the description of the related content with reference to the second indication information is not repeated.

In step 904, the first terminal device operates on one or more carriers other than the third carrier during the first period of time.

The first terminal device may perform link establishment or discover other terminal devices in a first period of time.

It should be noted that, in the embodiment of the present application, the first terminal device may not need to acquire the first indication information, and may determine one or more first time periods according to the second indication information, for example, may determine a time other than the second time period as one or more first time periods.

Similarly, the first terminal device may not need to acquire the second indication information, and may determine one or more second time periods according to the first indication information, for example, may determine a time other than the first time period as one or more second time periods.

In the embodiment of the present application, the first terminal device may also operate on a plurality of carriers in the second period, and in the embodiment of the present application, description is given by taking the example that the first terminal device operates on a third carrier in the second period. The one or more carriers on which the first terminal device operates during the first time period are different from the one or more carriers on which the first terminal device operates during the second time period. For example, any one of the one or more carriers in which the first terminal device operates in the first time period is different from any one of the one or more carriers in which the first terminal device operates in the second time period.

In yet another possible embodiment, the first terminal device may obtain first configuration information, where the first configuration information indicates a time division multiplexing pattern (pattern) in which the first terminal device operates, and fig. 9b schematically illustrates a possible schematic diagram of the time division multiplexing pattern (pattern) in which the first terminal device operates, and as shown in fig. 9b, the first configuration information indicates a plurality of working periods, where each working period includes a first period and a second period. The first terminal device may operate on one or more other carriers than the third carrier during the first period of time and on the third carrier during the second period of time.

In a possible implementation, before step 901, the first terminal device may already operate on the third carrier, when it is determined that it is still required to operate on one or more carriers other than the third carrier, and the first terminal device does not support to operate on the third carrier at the same time, and on one or more other carriers other than the third carrier. In this case, the first terminal device may operate in a time division multiplexed manner by the scheme provided in fig. 9a described above.

In this way, the first terminal device may operate on different carriers in the first period and the second period, and when the capability of the first terminal device is low, such as not supporting simultaneous operation on the third carrier and one or more other carriers, the first terminal device may operate on the third carrier in the second period, and operate on one or more other carriers except the third carrier in the first period, and the first terminal device achieves the purpose of operating on the third carrier and the one or more other carriers by using a time division multiplexing method. And the scheme can reduce the requirement on the capability of the first terminal equipment, thereby reducing the cost of the first terminal equipment.

Further, after step 902, the first terminal device may further perform:

in step 905, the first terminal device sends third indication information on a third carrier, where the third indication information is used to indicate that the first terminal device transmits a message on a side-uplink basis on the third carrier in one or more second time periods.

For example, before the step 901, the first terminal device and the third terminal device perform signaling/data transmission based on the side link on the third carrier, when the first terminal device needs to operate on the third carrier for one or more second time periods after the step 902, the first terminal device needs to send third indication information to the third terminal device on the third carrier to inform the third terminal device that the first terminal device only operates on the third carrier for one or more second time periods, so that the third terminal device may also change the operation mode, for example, the third terminal device may also perform communication based on the side link with the first terminal device on the third carrier for one or more second time periods, and the third terminal device may not perform signaling/data transmission based on the side link with the first terminal device on the third carrier for a time period other than the second time period. Therefore, the situation that the third terminal equipment sends the message to the first terminal equipment on the third carrier at the time except the second time period and the first terminal equipment cannot receive the message can be avoided.

It should be noted that the first terminal device may inform the third terminal device of the information of the period in which the first terminal device can operate on the third carrier (the second period), or may inform the third terminal device of the information of the period in which the first terminal device cannot operate on the third carrier (the first period). The third terminal device may determine, according to either of the two information, a time period during which itself and the first terminal device may perform signaling/data transmission based on the side-link based on the third carrier. In another possible implementation manner, the third terminal device may acquire the second indication information, where the second indication information may be preconfigured on the third terminal device side, or may be issued to the third terminal device side by the base station.

The solution shown in fig. 9a may also be used in combination with the method provided in fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 7, fig. 8, for example, the first terminal device may perform the first terminal device side solution in the method provided in fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 7, fig. 8 during one or more first time periods, and the first terminal device side solution in the method provided in fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 7, fig. 8 is not performed during a time period other than the first time period.

For example, the first terminal device may perform step 301 during one or more first time periods, for example, to transmit a plurality of targeted messages over a plurality of carriers via a side-link. The related content can be found in the foregoing description, and will not be repeated.

It should be noted that, the first terminal device may further send fourth indication information on the carrier that operates in the first period, where the fourth indication information is used to inform other terminal devices that the first terminal device operates in one or more carriers in the first period. For example, when the first terminal device operates on the second carrier (or is a preset carrier) in the first period, for example, when the second carrier communicates with the second terminal device based on the side link, the first terminal device needs to send fourth indication information to the second terminal device in the second carrier to inform the second terminal device that the first terminal device only operates on the second carrier in one or more first periods, so that the second terminal device may also set a corresponding operation mode, for example, the second terminal device may also communicate with the first terminal device based on the side link in one or more first periods in the second carrier, and the second terminal device may no longer perform signaling/data transmission based on the side link with the first terminal device in periods other than the first period. Therefore, the situation that the second terminal equipment sends the message to the first terminal equipment on the second carrier at the time except the first time period and the first terminal equipment cannot receive the message can be avoided.

More time periods can be included in one period in the embodiment of the present application, and in the embodiment of the present application, the first time period and the second time period are taken as examples for illustration.

In the embodiment of the present application, the first terminal device side is taken as an example in fig. 9a and fig. 9b, which describe that the terminal device works on multiple carriers in a time division multiplexing manner, and the scheme may also be applicable to the second terminal device side. For example, the second terminal device obtains first indication information, where 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 one possible embodiment, the second terminal device obtains fifth indication information, the fifth indication information indicating one or more third time periods. The second terminal device performs at least one of the following for one or more third time periods: the second terminal equipment monitors on a fifth carrier; or alternatively; the second terminal device transmits a message on a fifth carrier based on the side-uplink. 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, which may comprise a continuous time. The two third time periods may be separated by a period of time, i.e. the two third time periods are discontinuous. The second terminal device works on the fifth carrier wave in the third time period, and other times can be used for carrying out other works, so that the flexibility of the working mode of the second terminal device can be improved.

In one possible embodiment, there is no overlap between any of the one or more first time periods and any of the one or more third time periods. The third time period of the present application may be the same as the second time period, and may be different from any of the second time periods, which is not limited in the embodiment of the present application. If the second terminal device does not support to operate on the fifth carrier and other carriers (such as the first carrier and the second carrier) simultaneously in the same time period, the second terminal device may operate on the fifth carrier and other carriers in a time division multiplexing manner, so as to reduce the requirement on the capability of the second terminal device.

In one possible embodiment, the second terminal device transmits sixth indication information on the fifth carrier, the sixth indication information being used to instruct the second terminal device to transmit a message on a side-uplink basis on the fifth carrier in one or more third time periods. Because the other terminal equipment sends the message to the second terminal equipment by the fifth carrier in the non-third time period and the second terminal equipment cannot receive the message, after the second terminal equipment sends the sixth indication information, the terminal equipment which communicates with the second terminal equipment on the fifth carrier can also communicate with the second terminal equipment in the third time period, and does not communicate with the second terminal equipment on the fifth carrier in the non-third time period, so that the resource waste of the other terminal equipment can be reduced.

The solution according to the embodiment of the present application may also be used in combination with the solution described above, such as for example that the second terminal device may monitor on the second carrier during one or more first time periods; listening may also be performed on the first carrier and the second carrier. For another example, the second terminal device listens on the preset carrier in one or more first time periods, and so on. The preset carrier is not the third carrier.

The scheme of time division multiplexing operation on the plurality of carriers at the second terminal device side is similar to the scheme of time division multiplexing operation on the plurality of carriers at the first terminal device side, and will not be described again.

According to the content shown in fig. 1a, fig. 1b, fig. 1c, fig. 2a, fig. 2b, fig. 2c, fig. 2d, and fig. 2e, fig. 10a illustrates a flow chart of a signaling/data transmission method based on a side uplink according to an embodiment of the present application. This method is illustrated in fig. 10a by way of example by a first terminal device and a second terminal device. The solution executed by the first terminal device side in the embodiment of the present application may also be executed by a unit, a module or a chip inside the first terminal device, and the solution executed by the second terminal device side may also be executed by a unit, a module or a chip inside the second terminal device. The first terminal device and the second terminal device may be the two terminal devices in fig. 1a, fig. 1b, or fig. 1c, and the related content is similar to the related content in fig. 3, and will not be described again.

As shown in fig. 10a, the method includes:

in step 1001, the first terminal device sends a first request message on the fourth carrier to the fourth terminal device, where the first request message requests signaling/data transmission based on the side uplink between the second carrier and the third terminal device.

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

In step 1002, the first terminal device transmits signaling/data based on the side-uplink between the second carrier and the fourth terminal device.

In the scheme provided in fig. 10a, if the first terminal device determines that signaling/data transmission based on the side link needs to be performed on one or more carriers (such as the second carrier) other than the fourth carrier, but signaling/data transmission based on the side link is still performed on the fourth carrier currently, and the first terminal device does not support signaling/data transmission based on the side link on the fourth carrier and other carriers (such as the second carrier) other than the fourth carrier at the same time, by using the scheme shown in fig. 10a, the first terminal device can migrate the signaling/data transmission based on the side link with the fourth terminal device to the second carrier, so as to achieve the purpose that the signaling/data transmission based on the side link between the first terminal device and the fourth terminal device is not interrupted, and the scheme can reduce the requirement on the capability of the first terminal device, so that the cost of the first terminal device can be reduced.

It should be noted that after the first terminal device sends the first request message, the fourth terminal device may refuse to migrate the side-link based signaling/data transmission at the first terminal device to the second carrier, in which case the first terminal device may interrupt the communication with the fourth terminal device, or may operate periodically on the fourth carrier and the second carrier through the scheme provided in fig. 9a, as described above. Therefore, the purpose that the signaling/data transmission based on the side link between the first terminal equipment and the fourth terminal equipment is not interrupted is achieved, and the scheme can reduce the requirement on the capability of the first terminal equipment, so that the cost of the first terminal equipment can be reduced.

The scheme shown in fig. 10a may also be used in combination with the methods provided in fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 7, fig. 8, for example, the first terminal device may migrate communication from the fourth terminal device to a carrier other than the fourth carrier, such as the second carrier, to be operated before performing the first terminal device-side scheme in the methods provided in fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 7, fig. 8.

Fig. 10b illustrates a possible schematic diagram of an operating carrier of a first terminal device, as shown in fig. 10b, where the first terminal device communicates with a fourth terminal device based on a side-uplink in a fourth carrier. The first terminal device then migrates communication with the fourth terminal device to the second carrier, where the first terminal device communicates with the fourth terminal device based on the side-link, and may also communicate with other terminal devices based on the side-link based on the second carrier (and may also include other carriers than the fourth carrier).

It should be noted that, in the embodiment of the present application, a certain network element (for example, an a network element) receives information from another network element (for example, a B network element), which may mean that the a network element receives information directly from the B network element, or that the a network element receives information from the B network element via another network element (for example, a C network element). When the a network element receives information from the B network element via the C network element, the C network element may transmit the information, or process the information, for example: and carrying the information in different messages for transmission or screening the information, and only sending the screened information to the A network element. Similarly, in embodiments of the present application, the sending of information by the a network element to the B network element may refer to the sending of information by the a network element directly to the B network element, or may refer to the sending of information by the a network element to the B network element via other network elements (e.g., C network element).

The terms "system" and "network" in embodiments of the application may be used interchangeably. "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the associated object is an or relationship, such as "signaling/data" as occurs in embodiments of the present application refers to signaling or data. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

And, unless otherwise specified, references to "first," "second," etc. ordinal words of embodiments of the present application are used for distinguishing between multiple objects and not for defining a sequence, timing, priority, or importance of the multiple objects.

It should be noted that the names of the above-mentioned messages are merely examples, and any message may change its name with the evolution of the communication technology, and no matter how the name changes, it falls within the protection scope of the present application as long as the meaning of the message is the same as that of the message of the present application.

According to the foregoing method, fig. 11 is a schematic structural diagram of an apparatus provided in an embodiment of the present application, as shown in fig. 11, the communication apparatus may be a first terminal device or a second terminal device, or may be a chip or a circuit, for example, may be a chip or a circuit disposed in the first terminal device, and further, for example, may be a chip or a circuit disposed in the second terminal device. The communication device may be configured to perform the method at the first terminal device side or the second terminal device side in any of the related schemes of fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 6b, fig. 7, fig. 8, fig. 9a, fig. 9b, fig. 10a or fig. 10 b.

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

Further, the communication device 1801 may include a memory 1804. The dashed line of memory 1804 is further illustrative of the optional meaning of memory.

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

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

In implementation, the steps of the methods described above may be performed by integrated logic circuitry in hardware or instructions in software in the processor 1802. The steps of a method disclosed in connection with embodiments of the present application may be embodied directly in hardware processor execution or in a combination of hardware and software modules in the processor 1802. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 1804 and the processor 1802 reads the information in the memory 1804 and performs the steps of the method described above in connection with its hardware.

It should be noted that the processor 1802 in an embodiment of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The 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 device, discrete gate or transistor logic, or discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It is appreciated that the memory 1804 in embodiments of the application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The related description of the memory in the embodiments of the present application may be referred to the foregoing, and will not be repeated here.

When the communication device 1801 is the first terminal device, the processor 1802 is configured to perform, through the transceiver 1803: transmitting a first message on a first carrier; transmitting a second message on a second carrier; the second carrier is a carrier which is determined by the first terminal device and is different from the first carrier; the first message and the second message are used for discovering other terminal equipment; or, the first message and the second message are both used for requesting to establish a link with the second terminal device.

When the communication device 1801 is the first terminal device described above, in a possible implementation, the processor 1802 is further configured to perform, through the transceiver 1803: monitoring is carried out on a first carrier wave; transmitting a second message on a second carrier, comprising: and sending a second message on the second carrier under the condition that the message responding to the first message is not received on the first carrier within the preset first time period.

When the communication device 1801 is the first terminal device, in a possible implementation manner, the processor 1802 is further configured to: receiving a third message from the second terminal device on the second carrier via transceiver 1803; signaling/data transmission is performed with the second terminal device on the second carrier based on the side-uplink.

When the communication device 1801 is the first terminal device, in a possible implementation manner, the processor 1802 is further configured to determine a first association relationship.

When the communication device 1801 is the first terminal device described above, in a possible implementation, the processor 1802 is further configured to, through the transceiver 1803: and sending the fourth message on the second carrier according to the destination identifier of the fourth message and the first association relationship when the first association relationship indicates that the first destination identifier is associated with the second carrier.

When the communication device 1801 is the first terminal device described above, in a possible implementation, the processor 1802 is further configured to, through the transceiver 1803: and sending the fourth message on the second carrier wave according to the destination identifier of the fourth message, the source identifier of the fourth message and the first association relationship under the condition that the first association relationship indicates the first source identifier and the first destination identifier are associated with the second carrier wave, and under the condition that the destination identifier of the fourth message comprises the layer two identifier of the second terminal equipment and the source identifier of the fourth message comprises the layer two identifier of the first terminal equipment.

When the communication device 1801 is the first terminal device described above, in a possible implementation, the processor 1802 is further configured to, through the transceiver 1803: acquiring first indication information, wherein the first indication information indicates one or more first time periods; the first message is transmitted on a first carrier and the second message is transmitted on a second carrier in one or more first time periods.

When the communication device 1801 is the first terminal device described above, in a possible implementation, the processor 1802 is further configured to, through the transceiver 1803: second indication information is acquired, the second indication information indicating one or more second time periods. Performing at least one of the following for one or more second time periods: monitoring is carried out on a third carrier wave; the third carrier is different from the first carrier, or the third carrier is different from the second carrier; or alternatively; and transmitting a message based on the side-link in a third carrier.

When the communication device 1801 is the first terminal device described above, in a possible implementation, the processor 1802 is further configured to, through the transceiver 1803: and sending a first request message to the fourth terminal equipment on the fourth carrier, wherein the first request message requests signaling/data transmission based on the side uplink between the second carrier and the fourth terminal equipment.

When the communication device 1801 is the second terminal device, the processor 1802 is configured to perform, through the transceiver 1803: monitoring is carried out on a first carrier wave, and monitoring is carried out on a second carrier wave; receiving a first message on a first carrier based on a side-uplink; a second message is received on a second carrier based on the side-link. The second carrier is different from the first carrier; the first message and the second message are used for discovering other terminal equipment, or the first message and the second message are used for requesting to establish a link with the second terminal equipment; and determining the carrier wave of the signaling/data transmission between the second terminal equipment and the first terminal equipment based on the side uplink from the first carrier wave and the second carrier wave.

When the communication device 1801 is the second terminal device, in a possible implementation manner, the processor 1802 is further configured to determine a second association relationship.

The concepts related to the technical solutions provided by the embodiments of the present application, explanation, detailed description and other steps related to the communications device refer to the descriptions of the foregoing methods or other embodiments, and are not repeated herein.

According to the foregoing method, fig. 12 is a schematic structural diagram of an apparatus according to an embodiment of the present application, and as shown in fig. 12, a communication apparatus 1901 may include a communication interface 1903 and a processor 1902. Further, the communication device 1901 may include a memory 1904. The dashed line in the figure indicates that the memory 1904 further identifies the memory as optional. A communication interface 1903 for inputting and/or outputting information; a processor 1902, configured to execute a computer program or instructions, to cause the communication device 1901 to implement a method on a first terminal device side in the related scenario of any of the above-mentioned fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 6b, fig. 7, fig. 8, fig. 9a, fig. 9b, fig. 10a or fig. 10b, or to cause the communication device 1901 to implement a method on a second terminal device side in the related scenario of any of the above-mentioned fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 6b, fig. 7, fig. 8, fig. 9a, fig. 9b, fig. 10a or fig. 10 b. In the embodiment of the present application, the communication interface 1903 may implement the scheme implemented by the transceiver 1803 of fig. 11, the processor 1902 may implement the scheme implemented by the processor 1802 of fig. 11, and the memory 1904 may implement the scheme implemented by the memory 1804 of fig. 11, which is not described herein.

Based on the above embodiments and the same concept, fig. 13 is a schematic diagram of an apparatus provided in the embodiment of the present application, as shown in fig. 13, the communication apparatus 2001 may be a first terminal device or a second terminal device, or may be a chip or a circuit, for example, may be a chip or a circuit provided in the first terminal device or the second terminal device.

The communication apparatus 2001 includes a processing unit 2002 and a communication unit 2003. Further, the communication device 2001 may include the storage unit 2004 or may not include the storage unit 2004. The dashed line of storage 2004 is further intended to identify the memory as optional.

A communication unit 2003 for inputting and/or outputting information; the processing unit 2002 is configured to execute a computer program or instructions, so that the communication device 2001 implements a method on a first terminal device side in a related scenario of any of the above-mentioned fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 6b, fig. 7, fig. 8, fig. 9a, fig. 9b, fig. 10a or fig. 10b, or a method on a second terminal device side in a related scenario of any of the above-mentioned fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 6b, fig. 7, fig. 8, fig. 9a, fig. 9b, fig. 10a or fig. 10 b. In the embodiment of the present application, the communication unit 2003 may implement the scheme implemented by the transceiver 1803 of fig. 11, the processing unit 2002 may implement the scheme implemented by the processor 1802 of fig. 11, and the storage unit 2004 may implement the scheme implemented by the memory 1804 of fig. 11, which will not be described herein.

According to a method provided by an embodiment of the present application, the present application also provides a computer program product, including: computer program code or instructions which, when run on a computer, cause the computer to perform the method of any of the embodiments shown in any of figures 3, 4a, 4b, 5a, 5b, 6a, 6b, 7, 8, 9a, 9b, 10a or 10 b.

According to the method provided by the embodiment of the present application, the present application further provides a computer readable storage medium storing a program code, which when executed on a computer, causes the computer to perform the method of any one of the embodiments shown in any one of fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 6b, fig. 7, fig. 8, fig. 9a, fig. 9b, fig. 10a or fig. 10 b.

According to the method provided by the embodiment of the application, the application further provides a chip system, and the chip system can comprise a processor. The processor is coupled to the memory and is operable to perform the method of any of the embodiments shown in any of fig. 3, 4a, 4b, 5a, 5b, 6a, 6b, 7, 8, 9a, 9b, 10a or 10 b. Optionally, the system on a chip further comprises a memory. Memory for storing a computer program (which may also be referred to as code, or instructions). A processor for calling and running a computer program from a memory, causing a device on which the chip system is installed to perform the method of any of the embodiments shown in any of fig. 3, fig. 4a, fig. 4b, fig. 5a, fig. 5b, fig. 6a, fig. 6b, fig. 7, fig. 8, fig. 9a, fig. 9b, fig. 10a or fig. 10 b.

According to the method provided by the embodiment of the application, the application also provides a system which comprises one or more first terminal devices, one or more second terminal devices and 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 in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means from one website, computer, server, or data center. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices, such as servers, data centers, etc., that contain an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

It is noted that a portion of this patent document contains material which is subject to copyright protection. The copyright owner has reserved copyright rights, except for making copies of patent documents or recorded patent document content of the patent office.

The communication apparatus and the method embodiments of the respective apparatus embodiments described above correspond to the first terminal device or the second terminal device, and the respective steps are performed by respective modules or units, for example, the communication unit (transceiver) performs the steps of receiving or transmitting in the method embodiments, and other steps than transmitting and receiving may be performed by the processing unit (processor). Reference may be made to corresponding method embodiments for the function of a specific unit. Wherein the processor may be one or more.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components may reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers. Furthermore, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with one another in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks (illustrative logical block) and steps (steps) described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium.

The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. A method of side-uplink based communication, comprising:

the first terminal equipment sends a first message on a first carrier;

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

the first message and the second message are used for discovering other terminal equipment; or, the first message and the second message are both used for requesting to establish a link with the second terminal device.

2. 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.

3. The method according to claim 1 or 2, wherein a protocol data unit, PDU, containing the first message is identical to a PDU containing the second message.

4. The method of claim 1 or 2, wherein,

the method further comprises the steps of:

the first terminal equipment monitors on the first carrier wave;

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

and under the condition that the message responding to the first message is not received on the first carrier within a preset first duration, the first terminal equipment sends the second message on the second carrier.

5. The method of any of claims 1-4, wherein the first message comprises indication information of a first service and the second message comprises indication information of the first service;

the first carrier and the second carrier support transmission of data of the first service.

6. The method of any of claims 1-5, wherein the first terminal device, after sending the second message on the second carrier, further comprises:

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

the first terminal device performs side-link communication with the second terminal device on the second carrier.

7. The method of claim 6, wherein the source identifier corresponding to the third message comprises a layer two 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 equipment determines a first association relation;

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

The first destination identifier comprises a layer two identifier of the second terminal device, and the first source identifier comprises a layer two identifier of the first terminal device.

8. The method of claim 7, wherein the first terminal device performs side-link communication with the second terminal device on the second carrier, comprising:

when the first association relationship indicates that a first destination identifier is associated with the second carrier, the first terminal device sends a fourth message on the second carrier according to the destination identifier corresponding to the fourth message and the first association relationship, and when the destination identifier corresponding to the fourth message includes a layer two identifier of the second terminal device;

or alternatively;

and under the condition that the first association relationship indicates that a first source identifier, a first destination identifier and the second carrier are associated, the first terminal equipment sends the fourth message on the second carrier according to the destination identifier corresponding to the fourth message, the source identifier corresponding to the fourth message and the first association relationship, and under the condition that the destination identifier corresponding to the fourth message comprises a layer two identifier of the second terminal equipment and the source identifier corresponding to the fourth message comprises a layer two identifier of the first terminal equipment.

9. The method of any one of claim 1 to 8, wherein,

the first terminal device sends the first message on a first carrier, and before the first terminal device sends the second message on a second carrier, the method further comprises:

the first terminal equipment acquires first indication information, wherein the first indication information indicates one or more first time periods;

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

the first terminal device sends the first message on a first carrier and sends a second message on a second carrier in one or more of the first time periods.

10. The method of claim 9, wherein the method further comprises:

the first terminal equipment acquires second indication information, wherein the second indication information indicates one or more second time periods;

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

the first terminal equipment 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 alternatively;

the first terminal device transmits a message based on a side-uplink on the third carrier.

11. A method of side-uplink based communication, comprising:

the second terminal equipment monitors on the first carrier wave, and monitors on the second carrier wave;

the second terminal device receives a first message on the first carrier based on a side-link;

the second terminal device receiving a second message on the second carrier based on a side-link; the second carrier 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 the second terminal device;

the second terminal equipment determines a carrier wave of the second terminal equipment for performing side-link communication with the first terminal equipment from the first carrier wave and the second carrier wave.

12. The method of claim 11, wherein the second terminal device, after determining a carrier from the first carrier and the second carrier that the second terminal device is in side-link communication with the first terminal device, further comprises:

The second terminal equipment determines a second association relation;

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

the second carrier is a carrier determined by the second terminal equipment and used for performing side uplink communication between the second terminal equipment and the first terminal equipment;

the second destination identifier comprises a layer two identifier of the first terminal device, and the second source identifier comprises a layer two identifier of the second terminal device.

13. A side-link communication device comprising a processing unit and a communication unit, the processing unit configured to communicate with the communication unit:

transmitting the first message on a first carrier;

transmitting a second message on a second carrier; the second carrier is a carrier which is determined by the first terminal device and is different from the first carrier;

14. The apparatus of claim 13, wherein a destination identifier corresponding to the second message is the same as a destination identifier corresponding to the first message.

15. The apparatus of claim 13 or 14, wherein a protocol data unit, PDU, containing the first message is the same as a PDU containing the second message.

16. The apparatus of claim 13 or 14, wherein,

the processing unit is further configured to monitor, by the communication unit, on the first carrier;

and sending the second message on the second carrier under the condition that the message responding to the first message is not received on the first carrier within a preset first duration.

17. The apparatus of any of claims 13-16, wherein the first message comprises indication information of a first service and the second message comprises indication information of the first service;

18. The apparatus according to any of claims 13-17, wherein the processing unit is further configured to receive, by the communication unit, a third message from the second terminal device at the second carrier;

and performing side-link communication with the second terminal equipment on the second carrier.

19. The apparatus of claim 18, wherein the source identifier corresponding to the third message comprises a layer two identifier of the second terminal device;

The processing unit is further configured to:

determining a first association relation;

20. The apparatus of claim 19, wherein the processing unit is further configured to, by the communication unit:

when the first association relationship indicates that a first destination identifier is associated with the second carrier, according to a destination identifier corresponding to a fourth message and the first association relationship, when the destination identifier corresponding to the fourth message includes a layer two identifier of the second terminal equipment, sending the fourth message on the second carrier;

or alternatively;

and when the first association relationship indicates that a first source identifier, a first destination identifier and the second carrier are associated, according to the destination identifier corresponding to the fourth message, the source identifier corresponding to the fourth message and the first association relationship, when the destination identifier corresponding to the fourth message comprises a layer two identifier of the second terminal device and the source identifier corresponding to the fourth message comprises a layer two identifier of the first terminal device, sending the fourth message on the second carrier.

21. The apparatus of any of claims 13-20, wherein the processing unit is further configured to, by the communication unit:

acquiring first indication information, wherein the first indication information indicates one or more first time periods;

the first message is sent on a first carrier and the second message is sent on a second carrier in one or more of the first time periods.

22. The apparatus of claim 21, wherein the processing unit is further configured to, by the communication unit:

acquiring second indication information, wherein the second indication information indicates one or more second time periods;

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

monitoring is carried out on a third carrier wave; the third carrier is different from the first carrier or the third carrier is different from the second carrier;

or alternatively;

and transmitting a message on the third carrier based on the side-link.

23. A side-link communication device comprising a processing unit and a communication unit, the processing unit configured to communicate with the communication unit:

monitoring is carried out on a first carrier wave, and monitoring is carried out on a second carrier wave;

Receiving a first message on the first carrier based on a side-link;

receiving a second message on the second carrier based on the side-link; the second carrier 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 the second terminal device;

and determining a carrier wave of the second terminal equipment for performing side-link communication with the first terminal equipment from the first carrier wave and the second carrier wave.

24. The apparatus of claim 23, wherein the processing unit is further to:

determining a second association relationship;

25. A communication device is characterized by comprising a processor and a memory,

the memory is used for storing a computer program or instructions;

the processor being configured to execute a computer program or instructions in a memory, to cause the method of any one of claims 1-10 to be performed, or to cause the method of any one of claims 11-12 to be performed.

26. A communication device comprising a processing module and a communication module, the processing module being configured to perform the method of any one of claims 1-10 or the method of any one of claims 11-12 by the communication module.

27. A computer readable storage medium storing computer executable instructions which, when invoked by a computer, cause the method of any one of claims 1-10 to be performed or the method of any one of claims 11-12 to be performed.

28. A system on a chip comprising a communication interface and a processor:

the communication interface is used for inputting and/or outputting signaling or data;

the processor being configured to execute a computer executable program to cause a device on which the chip system is installed to perform the method according to any one of claims 1-10 or to perform the method according to any one of claims 11-12.