CN112262587B

CN112262587B - Channel quality measurement method and terminal in D2D communication

Info

Publication number: CN112262587B
Application number: CN201980037525.3A
Authority: CN
Inventors: 卢前溪; 赵振山; 林晖闵
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-11-30
Filing date: 2019-05-07
Publication date: 2023-09-26
Anticipated expiration: 2039-05-07
Also published as: CN112262587A; WO2020107713A1; WO2020107424A1

Abstract

The invention discloses a channel quality measuring method, a terminal, a chip, a computer readable storage medium, a computer program product and a computer program in D2D communication, wherein the method comprises the following steps: generating a first message when the first terminal meets a first trigger condition; the first message is used for channel quality measurement by the second terminal or is used for feeding back channel quality information to the second terminal; the first terminal and the second terminal perform D2D communication; and sending a first message to the second terminal.

Description

Channel quality measurement method and terminal in D2D communication

Technical Field

The present invention relates to the field of information processing technologies, and in particular, to a channel quality measurement method in D2D communication, a terminal, a chip, a computer readable storage medium, a computer program product, and a computer program.

Background

The internet of vehicles system is a side-link transmission technology (SL) based on long term evolution terminal-to-terminal (LTE-D2D, long Term Evaluation-Device to Device). The internet of vehicles (V2X) was standardized in the third generation partnership project (3GPP,the 3rd Generation Partnership Project) Rel-14, defining two transmission modes: mode 3 and mode 4. In Rel-16, V2X is required to support unicast, and link measurement is important for unicast, so how to perform link measurement in a contention-based resource set is a problem to be solved.

Disclosure of Invention

To solve the above technical problems, embodiments of the present invention provide a channel quality measurement method, a terminal, a chip, a computer readable storage medium, a computer program product, and a computer program in D2D communication.

In a first aspect, a method for measuring channel quality in D2D communication is provided, which is applied to a first terminal, and includes:

generating a first message when the first terminal meets a first trigger condition; the first message is used for channel quality measurement by the second terminal or is used for feeding back channel quality information to the second terminal; the first terminal and the second terminal perform D2D communication;

and sending a first message to the second terminal.

In a second aspect, a method for measuring channel quality in D2D communication is provided, applied to a second terminal, and the method includes:

receiving a first message sent by a first terminal;

the first message is used for channel quality measurement by the second terminal or is used for feeding back channel quality information to the second terminal; and D2D communication is carried out between the first terminal and the second terminal.

In a third aspect, there is provided a first terminal comprising:

The first processing unit generates a first message when the first trigger condition is met; the first message is used for channel quality measurement by the second terminal or is used for feeding back channel quality information to the second terminal; the first terminal and the second terminal perform D2D communication;

and the first communication unit sends a first message to the second terminal.

In a fourth aspect, there is provided a second terminal comprising:

the second communication unit receives a first message sent by the first terminal;

In a fifth aspect, a terminal is provided that includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the method in the first aspect, the second aspect or each implementation manner thereof.

In a sixth aspect, a chip is provided for implementing the method in any one of the first to second aspects or each implementation thereof.

Specifically, the chip includes: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform the method as in any one of the first to second aspects or implementations thereof described above.

In a seventh aspect, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the method of any one of the above-described first to second aspects or implementations thereof.

In an eighth aspect, there is provided a computer program product comprising computer program instructions for causing a computer to perform the method of any one of the first to second aspects or implementations thereof.

A ninth aspect provides a computer program which, when run on a computer, causes the computer to perform the method of any one of the above-described first to second aspects or implementations thereof.

According to the technical scheme provided by the embodiment of the invention, the first terminal and the second terminal in the D2D communication scene can be triggered to measure the channel quality according to the first message transmitted by the first terminal and the second terminal, or the channel quality information is directly fed back to the second terminal. In this way, the terminal in D2D communication can be assisted in determining the quality of the link, and the link measurement is completed in the contention-based resource set.

Drawings

Fig. 1 is a schematic diagram of a D2D communication system architecture according to an embodiment of the present application;

fig. 2 is a schematic diagram of a D2D communication system architecture according to an embodiment of the present application;

fig. 3 is a schematic flow chart of a channel quality measurement method in D2D communication according to an embodiment of the present application;

fig. 4 is a schematic flow chart of a channel quality measurement method in D2D communication according to the second embodiment of the present application;

fig. 5 is a schematic diagram of a first terminal composition structure according to an embodiment of the present application;

fig. 6 is a schematic diagram of a second terminal composition structure according to an embodiment of the present application;

fig. 7 is a schematic diagram of a communication device according to an embodiment of the present application;

fig. 8 is a schematic block diagram of a chip provided in an embodiment of the present application.

Detailed Description

The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The scheme provided by the embodiment of the application can be applied to the vehicle networking system provided by fig. 1 and 2, wherein the vehicle networking system is a side-link transmission technology (SL) based on LTE-equipment-to-equipment (D2D), and has higher frequency spectrum efficiency and lower transmission delay. The internet of vehicles technology (V2X) was standardized in 3GPP Rel-14, defining two transmission modes: mode 3 and mode 4. Wherein, mode 3: as shown in fig. 1, the transmission resources of the terminal device, i.e. the vehicle-mounted terminal, are allocated by the base station, and the vehicle-mounted terminal transmits data on the side link according to the resources allocated by the base station; the base station may allocate resources for single transmission to the terminal, or may allocate resources for semi-static transmission to the terminal. Mode 4: as shown in fig. 2, the vehicle terminal adopts a transmission method of interception (sending) +reservation (reservation). The vehicle-mounted terminal acquires an available transmission resource set in a resource pool in a interception mode, and the terminal randomly selects one resource from the set to transmit data.

It should be understood that the terms "system" or "network" are often used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

Embodiment 1,

The embodiment of the invention provides a channel quality measurement method in D2D communication, which is applied to a first terminal, as shown in fig. 3, and comprises the following steps:

step 101: generating a first message when the first terminal meets a first trigger condition; the first message is used for channel quality measurement by the second terminal or is used for feeding back channel quality information to the second terminal; the first terminal and the second terminal perform D2D communication;

step 102: and sending a first message to the second terminal.

Specifically, in the foregoing step 101, the first message includes at least a reference signal, where the reference signal is used for channel quality measurement.

Specifically, the first message may include only the reference signal, and may include the reference signal and other data contents.

In the scenario where the first message only includes the reference signal, the first message may be sent to the second terminal as long as the first message is included, that is, the generated first message may be sent to the second terminal independently, regardless of whether there is any other data sent to the second terminal at present, and in this case, it may be understood that the sending process of the first message is performed only at the bottom layer.

The first message may not only include the scene of the reference signal, but also be sent in combination with other data, for example, the current higher layer determines that the data needs to be sent to the second terminal, and then places the first message in a data structure to be sent to send, which may be understood as attaching or attaching the first message to other data to send.

In the foregoing step 101, the first trigger condition may be: the first timer times out.

The first timer may be preset in the first terminal in advance, and the initial value is set to 0, at this time, a first timing threshold may be set, and when the timing duration of the first timer reaches the first timing threshold, it is determined that the first timer is overtime; alternatively, the initial value may be set to a value of the first timing threshold, for example, 30ms, 10ms, or 1s, and then when the first timer is started or restarted, the value thereof gradually decreases until the value decreases to 0, and it is determined that the first timer times out.

The control mode of starting or restarting the first timer comprises the following steps:

when the first terminal sends data, starting or restarting the first timer;

And/or the number of the groups of groups,

and when the first terminal receives the data sent by the second terminal, starting or restarting the first timer.

That is, when the first terminal needs to transmit data, the first timer starts to count; or when the first terminal receives the data of the second terminal, the first timer starts to count. One of the two control modes or both of the two control modes can be used in combination according to the actual situation, and the embodiment is not limited.

It should be understood that, there may be two cases where the first timer starts to count, that is, the first timer originally keeps an initial value, that is, the first timer originally counts to 0, and if the data sent by the second terminal is received or the data is sent to the second terminal, it is determined to start to count from 0;

in another case, the first timer is already in a timing state, for example, the first timer has already started to send data to the second terminal, and then the second terminal is sent data again, so that the value in the first timer which has already started to be cleared and restarted, and the timing from 0 can be restarted. Or, the first timer may be started originally because the first terminal starts to send data, and when the first terminal receives the data sent by the second terminal, the first timer may be restarted to restart the timing.

Specifically, the data includes at least one of: PSCCH transmitted data, PSSCH transmitted data, PSFCH transmitted data, MAC data PDU, MAC control PDU, RLC data PDU, RLC control PDU, PDCP data PDU, PDCP control PDU, PC5-S PDU, reference signal.

In the foregoing step 102, the sending a first message to the second terminal includes:

in a first period, N first messages are sent to the second terminal; wherein N is an integer greater than or equal to 1.

The first period may be set according to practical situations, for example, may be set to 20ms or longer, for example, 1s, which is not exhaustive in this embodiment.

The number of N may also be set according to practical situations, for example, N may be 4, or may be 2. That is, 2 first messages may be sent to the second terminal within 20ms, and of course, 4 first messages may be sent within 1s, which is not described herein.

Further, the sending N first messages to the second terminal in the first period includes:

n first messages are sent to the second terminal at M time-frequency resources in a first period; wherein M is an integer greater than or equal to N.

The time-frequency resource is configured by the network side, or configured by the second terminal, or preconfigured by the first terminal.

That is, the location of the time-frequency resource may be configured by the network side, such as the base station, for the terminal, where the time-frequency resource may be configured for both the base station side and the first terminal, so that the first terminal may learn at which time-frequency resource locations the first message may be sent, or may also enable the second terminal to learn at which time-frequency resource locations the first message may be received.

In addition, the location of the time-frequency resource may be configured by the second terminal, where the configuration may be that the first terminal and the second terminal obtain, when they communicate in the early stage, locations of the M time-frequency resources carried in data sent by the second terminal. In this way, the first terminal is enabled to know at which time-frequency resource locations the first message can be sent, or the second terminal can also be enabled to know at which time-frequency resource locations the first message can be received.

When the time-frequency resource is configured by the first terminal, the second terminal may not be notified of its configuration; of course, the positions of the M time-frequency resources configured by the first terminal for the first terminal may also be notified to the second terminal, and the sending manner may be that the M time-frequency resources are carried in other transmission data and sent to the second terminal, so that the second terminal can learn at which time-frequency resource positions the first message can be received.

M is an integer greater than or equal to N, that is, the first message may be sent in all or only some of the time-frequency resource positions configured by the first terminal.

It should be noted that the first message may be sent according to M preset time-frequency resources, and may, of course, be sent without limitation of the time-frequency resources; for example, the first message may be sent according to M preset time-frequency resources, that is, the time or frequency domain range for sending the first message is divided for the first terminal in advance, and the first message may be attempted to be sent to the second terminal in each time and frequency domain range; in the case that the first message is not transmitted according to the preset time-frequency resource, the first message may be started to be transmitted to the second terminal as soon as the first message is generated, for example, if the first period is 1s, the first message may be transmitted at 0.2s, and the first message is transmitted at 0.5 s.

And in the first period, sending N first messages to the second terminal, and further comprising:

if the transmission of N first messages is not completed before the first period is finished, the first terminal keeps attempting to transmit the first messages;

Or alternatively, the process may be performed,

and stopping sending the first messages if the N first messages are sent before the first period is finished. Specifically, before the first period ends, if the transmission of the predetermined N first messages is not completed, the first messages are still kept to be attempted to be transmitted, until the first period ends, or until the transmission of the N first messages is completed.

In other words, it can be understood that if M time-frequency resources are not set, the transmission of the first message may be kept until the transmission of the first message is stopped when the first period is not finished, until the transmission of the first message is completely performed by N first messages, or until the transmission of the first message is stopped when the first period is finished.

Or if M time-frequency resources are set, the method may be that before the first period ends, if N first messages are not attempted to be sent in all time-frequency resources of the M time-frequency resources, the first messages are kept being attempted to be sent on the next time-frequency resource; if the first message has been attempted to be sent on all M time-frequency resources, when the sending of the N message messages has not yet been completed, the first message may still be kept attempted to be sent at other time-domain resource bits until the first period ends or until the sending of the N first messages is completed.

Finally, it should be further noted that the first message may also be feedback of signal quality information to the second terminal, that is, there is a scenario in this embodiment that the first terminal may receive, before step 101, a message for performing channel quality measurement sent by the second terminal, and the first terminal may perform channel quality measurement according to the message, and further feedback, through the first message, the channel quality information to the second terminal, so that the second terminal may also obtain the channel quality detected by the first terminal.

The manner in which the second terminal sends the message for performing the channel quality measurement may be the same as the manner in which the first terminal sends the message in this embodiment, which is not described herein.

Finally, it should be noted that the first terminal may be one of the following:

a multicast communication group head terminal;

a terminal in configured multicast communication;

group member terminals in multicast communications.

The terminal in the configured multicast communication can be understood as the terminal pointed out by the indication information, namely the first terminal. The group member terminal in the multicast communication may be other terminals than the group head terminal in the multicast communication. The group head terminal and the group member terminal may be determined by upper layer indication or pre-configuration or network configuration.

It should also be noted that the method provided in this embodiment further includes: and when the first message contains the reference signal, selecting a resource for transmitting the reference signal. The first message may include only the reference signal. If the first message only has the reference signal to send and no other data to send, the resource can be selected for sending the reference signal, and the selected resource is correspondingly used for bearing the reference signal, namely the first message.

In addition, the method further comprises: and when the first message contains the reference signal, filling bits on resources carrying the reference signal. Similarly, in this scenario, if there is only a reference signal in the first message, when there is no other data to be transmitted, bit filling may be performed on the corresponding resource for transmitting the reference signal, so as to further transmit the reference signal. It should also be noted that the bit padding may be padding preset bits, or configured bits, for example, padding bits "0" may be preset, that is, padding 0 on other bits without data; of course other padding bits, such as 1, etc., may be set, which is not intended to be exhaustive.

The first message is not used to determine link activity between the first terminal and the second terminal.

Wherein the link activity condition characterizes a link between the first terminal and a second terminal as being active or inactive.

Further, when the duration of the link between the first terminal and the second terminal in the inactive state reaches a preset duration, releasing the link between the first terminal and the second terminal.

That is, when the first terminal receives or transmits data, the timer may be started or restarted, and at this time, the link between the first terminal and the second terminal may be considered to be in an active state. When the first message is transmitted, if the first message only contains reference information (RS), the timer keeps counting, and at the moment, namely, a link between the first terminal and the second terminal is in an inactive state; correspondingly, when the timing duration of the timer reaches the preset duration, the first terminal can be controlled to release the link with the second terminal.

By adopting the scheme, the first terminal and the second terminal in the D2D communication scene can be triggered to measure the channel quality according to the first message transmitted by the first terminal and the second terminal, or the channel quality information is directly fed back to the second terminal. In this way, the terminal in D2D communication can be assisted in determining the quality of the link, and the link measurement is completed in the contention-based resource set.

Embodiment II,

The embodiment of the invention provides a channel quality measurement method in D2D communication, which is applied to a second terminal, as shown in fig. 4, and comprises the following steps:

step 201: receiving a first message sent by a first terminal;

The first message at least comprises a reference signal, wherein the reference signal is used for channel quality measurement.

Further, the present embodiment further includes:

when a second trigger condition is met, the second terminal releases the connection with the first terminal; or when the second trigger condition is met, reporting the link failure by the second terminal.

Wherein the second terminal releases the connection with the first terminal, comprising: and the second terminal sends a connection release message to the first terminal. That is, when the connection with the first terminal needs to be released, the second terminal may release the connection of the first terminal after sending the connection release message to the first terminal, or may release the connection of the first terminal after receiving the acknowledgement message fed back by the first terminal after sending the connection release message to the first terminal.

The link failure reporting by the second terminal may be a link failure reporting to an upper layer.

The second trigger condition includes: the second timer times out.

The second timer may be preset in the second terminal in advance, and the initial value is set to 0, at this time, a second timing threshold may be set, and when the timing duration of the second timer reaches the second timing threshold, it is determined that the second timer is overtime; alternatively, the initial value may be set to a value of the second timing threshold, for example, 30ms, 10ms, or 1s, and then when the second timer is started or restarted, the value thereof gradually decreases until the value decreases to 0, and it is determined that the second timer times out.

The control mode of starting or restarting the second timer comprises the following steps:

when the second terminal sends data, starting or restarting the second timer;

or alternatively, the process may be performed,

and when the second terminal receives the data sent by the first terminal, starting or restarting the second timer.

That is, when the second terminal needs to transmit data, the second timer starts to count; or when the second terminal receives the data of the first terminal, the second timer starts to count. One of the two control modes or both of the two control modes can be used in combination according to the actual situation, and the embodiment is not limited.

It should be understood that, there may be two cases where the second timer starts to count, that is, the second timer originally keeps an initial value, that is, the second timer originally counts to 0, and if the data sent by the first terminal is received or the data is sent to the first terminal, it is determined to start to count from 0;

in another case, the second timer is already in a timing state, for example, the second timer has already started to send data to the first terminal, and then sends data to the first terminal again, the value in the second timer which has already started to be cleared again can be restarted, and timing from 0 can be restarted. Or, the second timer may be started originally because the second terminal starts to send data, and the second timer may be restarted to restart the timing when the second terminal receives the data sent by the first terminal.

After receiving the first message sent by the first terminal, the method further includes:

when the first message contains a reference signal, the second terminal performs channel measurement according to the reference signal in the first message; wherein the reference signal is used for channel quality measurement.

Still further, the second triggering condition may further include at least one of:

the first terminal is a group head device in multicast communication;

a first number of terminals in a first state are provided in multicast communication;

a terminal in a first state in multicast communication is a first proportion;

all terminals in multicast communication are in a first state;

a terminal configured in multicast communication is in a first state.

The first state may be an abnormal state of the link quality, or may be understood as an abnormal communication state, or may be understood as a state in which the link quality has a problem, or may be understood as a state in which the third timer times out, that is, the third timers corresponding to at least some of the terminals in the multicast communication are respectively corresponding to the devices, and the third timers corresponding to different terminals in the multicast communication may be the same or different, and when the third timer corresponding to a certain terminal is in the time-out state, it may be determined that the terminal is the terminal in the first state.

The first number may be a value set according to practical situations, for example, when the multicast communication includes 100 terminals, then the first number may be understood as up to 80; when the multicast communication includes 10 terminals, the first number may be 7, which is just an example, and the specific setting of the first number may be flexibly adjusted, which is not exhaustive in this embodiment.

The first ratio may be a ratio value set according to practical situations, for example, may be 85%. That is, when the multicast communication includes 100 terminals, the second trigger condition is determined to be met when the abnormal state or the problematic terminal reaches 85. Of course, this first ratio can also be flexibly adjusted and is not exhaustive.

The configured terminal may be a terminal indicated by the network side and used for judging whether the second triggering condition is met, for example, the multicast communication includes terminals 1-10, the configured terminal may be terminals 1, 3, 7, and at least part of the terminals 1, 3, 7 are in a first state, so that the second triggering condition is met. It should be understood here that the configuration may be flexibly set according to the actual situation, for example, the terminals that may be configured may all be set to conform to the first state and conform to the second trigger condition, or may be set to have 1 of them in the first state and conform to the second trigger condition. The present embodiment is not limited thereto.

The second triggering condition further includes: at least a portion of the carrier, or pool of resources, or resources, is in a first state;

wherein the carrier, or resource pool, or resource is used for communication between the first terminal and the second terminal. It should be clear that at least one resource pool may be included in the carrier, and at least one resource may be included in one resource pool.

The at least a portion of the carrier or resource pool or resource is at least one of:

a second number of carriers, or a second number of resource pools, or a second number of resources;

a second proportion of carriers, or a second proportion of resource pools, or a second proportion of resources;

all carriers, or all resource pools, or all resources;

configured carriers, or configured resource pools, or configured resources.

The first state may be an abnormal state of a carrier, or a resource pool, or a link quality of a resource, for example; at least one of the reference signal received power (RSRP, reference Signal Receiving Power), the received signal strength (RSSI, received Signal Strength Indication), the reference signal received quality (RSRQ, reference Signal Receiving Quality), the channel busy rate (CBR, channel Busy Rate) is above or below a corresponding threshold, e.g., at least one of the links RSRP, RSRQ, RSSI, CBR measured on a particular carrier, or resource pool, or resource is above or below a corresponding preset threshold; alternatively, the abnormal communication state may be understood as a state in which a problem occurs in the link quality, or may be understood as a state in which the fourth timer times out, that is, the fourth timer corresponding to the carrier, or the resource pool, or at least a part of the carrier, or the resource pool, or the resource respectively, may be the same or different, and when the fourth timer corresponding to a certain carrier, or the resource pool, or the resource is in the time-out state, it may be determined that the carrier, or the resource pool, or the resource is in the first state.

The second number may be a value set according to practical situations, for example, when the second number includes 8 carriers, then the second number may be understood to be up to 5, the foregoing is merely an example, and the specific setting of the second number may be flexibly adjusted, which is not exhaustive in this embodiment. The resource pool and the resources can be understood in the same manner, and are not described in detail herein.

The second ratio may be a ratio value set according to practical situations, for example, may be 80%. That is, when 10 carriers are included, it is determined that the second trigger condition is met when the abnormal state or the problematic terminal reaches 8. Of course, this second ratio can also be flexibly adjusted and is not exhaustive. The resource pool and the resources can be understood in the same manner, and are not described in detail herein.

The configured carrier, or resource pool, or resource may be a carrier, or resource pool, or resource indicated by the network side for determining whether the second trigger condition is met, for example, the carrier includes 1-8, where the carrier with relatively important or most reference value is carrier 3, and then carrier 3 may be the configured carrier, and when carrier 3 is in the first state, it may be determined that the second trigger condition is met. It should be understood here that the configuration may be flexibly set according to the actual situation, for example, more carriers that may be configured, such as carriers 1, 3, and 4, may be configured to meet the second triggering condition only when all of carriers 1, 3, and 4 meet the first state, or may be configured to meet the second triggering condition when some of carriers 1, 3, and 4 are in the first state. The present embodiment is not limited thereto. The resource pool and the resources can be understood in the same manner, and are not described in detail herein.

It should be further noted that at least two of the carriers, the resource pools and the resources may be used in combination, for example, the second number of carriers and the third number of resource pools are in the first state and meet the second trigger condition, where the resource pools may be the resource pools in the second number of carriers in the first state, or may not be the resource pools, which is not limited herein. For another example, the second number of resource pools and the fourth number of resources may be in the first state, and conform to the second trigger condition, and similarly, the resources may be different in the resource pools in the first state, which is not limited. Of course, the second number of carriers, the third number of resource pools and the fourth number of resources may be in the first state, and conform to the second triggering condition. In any case, it can be determined whether the second triggering condition is met according to the actual situation.

After the second terminal performs channel measurement according to the reference signal in the first message, the method further includes:

the second terminal feeds back at least one channel quality information to the first terminal at least one time-frequency resource in a second period.

Wherein the number of the at least one time-frequency resource is greater than or equal to the number of the at least one channel quality information.

It should be noted that at least one time-frequency resource in the second period in the present embodiment is different from M time-frequency resources in the first period in the foregoing embodiment.

The second period may be set according to practical situations, for example, may be set to 20ms or longer, for example, 1s, which is not exhaustive in this embodiment.

The time-frequency resource is configured by a network side, or configured by a first terminal, or preconfigured by a second terminal.

That is, the location of the time-frequency resource may be configured by the network side, such as the base station, for the terminal, where the time-frequency resource may be configured for both the base station side and the first terminal, so that the first terminal may learn at which time-frequency resource locations the channel quality information may be received, or may also enable the second terminal to learn at which time-frequency resource locations the channel quality information may be sent.

In addition, the position of the time-frequency resource can be configured by the first terminal, and the configuration mode can be that the position of the time-frequency resource carried in the data sent by the first terminal is obtained when the first terminal and the second terminal communicate in the earlier stage. In this way, the second terminal is enabled to know at which time-frequency resource locations channel quality information can be transmitted, or the first terminal is enabled to know at which time-frequency resource locations channel quality information can be received.

When the time-frequency resource is configured by the second terminal, the first terminal may not be notified of its configuration; of course, the position of the time-frequency resource configured by the first terminal for the first terminal can also be notified to the first terminal, and the sending mode of the time-frequency resource can be carried in other transmission data and sent to the first terminal, so that the first terminal can know at which time-frequency resource positions the channel quality information can be received.

It should be understood that, when the feedback of the channel quality information to the first terminal provided in this embodiment may further include:

if the transmission of the channel quality information is not completed before the second period is finished, the second terminal keeps attempting to transmit the channel quality information;

or alternatively, the process may be performed,

and stopping transmitting the channel quality information if the transmission of the channel quality information is completed before the second period is finished.

Specifically, if the transmission of the predetermined channel quality information is not completed before the second period is completed, the transmission of the channel quality information is still attempted until the transmission of the channel quality information is stopped at the end of the second period or until the transmission of the channel quality information is completed.

In connection with the first and second embodiments, two processing scenarios are provided below to explain the foregoing embodiments:

scene 1,

When the first terminal has any data transmission, starting or restarting a first timer, wherein the data comprises at least one of the following components: PSCCH, PSSCH, PSFCH, MAC data PDU, MAC control PDU, RLC data PDU, RLC control PDU, PDCP data PDU, PDCP control PDU, PC5-S PDU

When the first timer overtime meets a first trigger condition, the first terminal sends a first message, wherein the first message contains a reference signal and is used for channel measurement by the second terminal.

Accordingly, when the second terminal does not measure the reference signal from the first terminal within the time T (T is greater than the duration of the first timer), the second terminal judges that the channel is interrupted and thus releases the connection, for example, transmits a connection release signaling to the first terminal.

Scene 2,

When the first timer expires, the first terminal transmits a first message containing a reference signal for the second terminal to perform channel measurement.

The second terminal is configured to transmit y=2 channel quality feedback in each time period x=20 ms. The second terminal measures the signal from the first terminal and attempts to send feedback at 4 predetermined time-frequency locations;

if the user has not completed the task of transmitting 2 channel quality feedback at the time-frequency position within the current 20ms period, the second terminal continues to attempt to transmit channel quality feedback at the remaining time-frequency position within the current 20ms period;

if the task of transmitting 2 channel quality feedback at the time-frequency position within the current 20ms period has been completed, the second terminal does not continue to attempt to transmit channel quality feedback at the remaining time-frequency positions within the current 20ms period.

a multicast communication group head terminal;

a terminal in configured multicast communication;

group member terminals in multicast communications.

The first message is not used to determine link activity between the first terminal and the second terminal. That is, upon receiving the first message, the second terminal does not determine a link activity condition between the first terminal and the second terminal according to the first message.

That is, when the second terminal receives or transmits data, the timer may be started or restarted, and at this time, the link between the first terminal and the second terminal may be considered to be in an active state. When the first message is transmitted, if the first message only contains reference information (RS), the timer keeps counting, and at the moment, namely, a link between the first terminal and the second terminal is in an inactive state; correspondingly, when the timing duration of the timer reaches the preset duration, the second terminal can be controlled to release the link with the first terminal.

It should also be noted that the timer corresponding to the second terminal may be the same as or different from the timer corresponding to the first terminal.

Third embodiment,

An embodiment of the present invention provides a first terminal, as shown in fig. 5, including:

a first processing unit 51 that generates a first message when a first trigger condition is satisfied; the first message is used for channel quality measurement by the second terminal or is used for feeding back channel quality information to the second terminal; the first terminal and the second terminal perform D2D communication;

the first communication unit 52 sends a first message to the second terminal.

Specifically, the first message at least includes a reference signal, where the reference signal is used for channel quality measurement.

The first trigger condition may be: the first timer times out.

the first processing unit 51 starts or restarts the first timer when the first communication unit 52 transmits data;

and/or the number of the groups of groups,

when the first communication unit 52 receives the data from the second terminal, it starts or restarts the first timer.

That is, when data needs to be transmitted, the first timer starts to count; or, when receiving the data of the second terminal, the first timer starts to count. One of the two control modes or both of the two control modes can be used in combination according to the actual situation, and the embodiment is not limited.

in another case, the first timer is already in a timing state, for example, the first timer has already started to send data to the second terminal, and then the second terminal is sent data again, so that the value in the first timer which has already started to be cleared and restarted, and the timing from 0 can be restarted. Alternatively, the first timer may be started originally because the first communication unit 52 starts to transmit data, and the first timer may be restarted to restart the timing when the first communication unit 52 receives the data transmitted from the second terminal.

A first communication unit 52 that transmits N first messages to the second terminal in a first period; wherein N is an integer greater than or equal to 1.

Further, the first communication unit 52 sends N first messages to the second terminal at M time-frequency resources in the first period; wherein M is an integer greater than or equal to N.

The first communication unit 52 keeps attempting to send the first message if the transmission of N first messages is not completed before the end of the first period;

or alternatively, the process may be performed,

Finally, it should be noted that the first message may also be feedback of signal quality information to the second terminal, that is, in this embodiment, there is a scenario where the first communication unit 52 receives a message for performing channel quality measurement sent by the second terminal, and may perform channel quality measurement according to the message, and further feedback of the channel quality information to the second terminal through the first message, so that the second terminal may also obtain the channel quality detected by the first terminal.

a multicast communication group head terminal;

a terminal in configured multicast communication;

group member terminals in multicast communications.

It should be further noted that, in this embodiment, the first processing unit 51 selects the resource for transmitting the reference signal when the reference signal is included in the first message. The first message may include only the reference signal. If the first message only has the reference signal to send and no other data to send, the resource can be selected for sending the reference signal, and the selected resource is correspondingly used for bearing the reference signal, namely the first message.

In addition, when the first message includes a reference signal, the first processing unit 51 performs padding on a resource carrying the reference signal. Similarly, in this scenario, if there is only a reference signal in the first message, when there is no other data to be transmitted, bit filling may be performed on the corresponding resource for transmitting the reference signal, so as to further transmit the reference signal. It should also be noted that the bit padding may be padding preset bits, or configured bits, for example, padding bits "0" may be preset, that is, padding 0 on other bits without data; of course other padding bits, such as 1, etc., may be set, which is not intended to be exhaustive.

The first message is not used to determine link activity between the first terminal and the second terminal. Wherein the link activity condition characterizes a link between the first terminal and a second terminal as being active or inactive.

Further, the first processing unit 51 controls the first communication unit 52 to release the link between the first terminal and the second terminal when the duration in which the link between the first terminal and the second terminal is in the inactive state reaches the preset duration.

That is, when the first communication unit 52 receives or transmits data, the first processing unit 51 may start or restart the timer, and at this time may consider that the link between the first terminal and the second terminal is in an active state. When the first message is transmitted, if the first message only contains reference information (RS), the timer keeps counting, and at the moment, namely, a link between the first terminal and the second terminal is in an inactive state; correspondingly, when the timing duration of the timer reaches the preset duration, the second terminal can be controlled to release the link with the first terminal.

Fourth embodiment,

An embodiment of the present invention provides a second terminal, as shown in fig. 6, including:

a second communication unit 61 for receiving a first message from the first terminal;

The second terminal further includes:

a second processing unit 62 that controls the second communication unit 61 to release the connection with the first terminal when the second trigger condition is satisfied; or, when the second trigger condition is satisfied, the second communication unit 61 is controlled to report a link failure. For example, the second communication unit 61 may report a link failure to the upper layer.

Wherein the second terminal releases the connection with the first terminal, comprising: the second communication unit 61 transmits a connection release message to the first terminal. That is, when it is required to release the connection with the first terminal, the second communication unit 61 may release the connection of the first terminal after transmitting the connection release message to the first terminal, or may control the second communication unit 61 to release the connection of the first terminal after receiving the acknowledgement message fed back by the first terminal after transmitting the connection release message to the first terminal.

The second trigger condition includes: the second timer times out.

The second timer may be preset in the second terminal in advance, and the initial value is set to 0, at this time, a second timing threshold may be set, and when the timing duration of the first timer reaches the second timing threshold, it is determined that the second timer is overtime; alternatively, the initial value may be set to a value of the second timing threshold, for example, 30ms, 10ms, or 1s, and then when the second timer is started or restarted, the value thereof gradually decreases until the value decreases to 0, and it is determined that the second timer times out.

the second processing unit 62 is configured to process,

when the second communication unit 61 transmits data, the second timer is started or restarted;

or alternatively, the process may be performed,

when the second communication unit 61 receives the data transmitted from the first terminal, the second timer is started or restarted. That is, when data needs to be transmitted, the second timer starts to count; or, when the data of the first terminal is received, the second timer starts to count. One of the two control modes or both of the two control modes can be used in combination according to the actual situation, and the embodiment is not limited.

Still further, the second trigger condition includes at least one of:

the first terminal is a group head device in multicast communication;

a terminal in a first state in multicast communication is a first proportion;

all terminals in multicast communication are in a first state;

a terminal configured in multicast communication is in a first state.

all carriers, or all resource pools, or all resources;

configured carriers, or configured resource pools, or configured resources.

After receiving the first message sent by the first terminal, the second communication unit 61 performs channel measurement according to the reference signal in the first message when the first message includes the reference signal; wherein the reference signal is used for channel quality measurement.

The second communication unit 61 feeds back at least one channel quality information to the first terminal at least one time-frequency resource in a second period.

or alternatively, the process may be performed,

a multicast communication group head terminal;

a terminal in configured multicast communication;

group member terminals in multicast communications.

Further, the second processing unit 62 controls the second communication unit 61 to release the link between the first terminal and the second terminal when the duration in which the link between the first terminal and the second terminal is in the inactive state reaches the preset duration.

Fig. 7 is a schematic block diagram of a communication device 700 according to an embodiment of the present application, where the communication device in this embodiment may be specifically a first terminal or a second terminal in the foregoing embodiment. The communication device 700 shown in fig. 7 comprises a processor 710, from which the processor 710 may call and run a computer program to implement the method in an embodiment of the application.

Optionally, as shown in fig. 7, the communication device 700 may further comprise a memory 720. Wherein the processor 710 may call and run a computer program from the memory 720 to implement the method in an embodiment of the application.

Wherein the memory 720 may be a separate device from the processor 710 or may be integrated into the processor 710.

Optionally, as shown in fig. 7, the communication device 700 may further include a transceiver 730, and the processor 710 may control the transceiver 730 to communicate with other devices, and in particular, may send information or data to other devices or receive information or data sent by other devices.

Among other things, transceiver 730 may include a transmitter and a receiver. Transceiver 730 may further include antennas, the number of which may be one or more.

Optionally, the communication device 700 may be specifically a network device according to an embodiment of the present application, and the communication device 700 may implement a corresponding flow implemented by the network device in each method according to an embodiment of the present application, which is not described herein for brevity.

Optionally, the communication device 700 may be specifically a terminal device or a network device according to an embodiment of the present application, and the communication device 700 may implement a corresponding flow implemented by a mobile terminal/terminal device in each method according to an embodiment of the present application, which is not described herein for brevity.

Fig. 8 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 800 shown in fig. 8 includes a processor 810, and the processor 810 may call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 8, chip 800 may also include memory 820. Wherein the processor 810 may call and run a computer program from the memory 820 to implement the method in embodiments of the present application.

Wherein the memory 820 may be a separate device from the processor 810 or may be integrated into the processor 810.

Optionally, the chip 800 may also include an input interface 830. The processor 810 may control the input interface 830 to communicate with other devices or chips, and in particular, may obtain information or data sent by other devices or chips.

Optionally, the chip 800 may further include an output interface 840. The processor 810 may control the output interface 840 to communicate with other devices or chips, and in particular, may output information or data to other devices or chips.

Optionally, the chip may be applied to the network device in the embodiment of the present application, and the chip may implement a corresponding flow implemented by the network device in each method in the embodiment of the present application, which is not described herein for brevity.

Optionally, the chip may be applied to a terminal device in the embodiment of the present application, and the chip may implement a corresponding flow implemented by the terminal device in each method in the embodiment of the present application, which is not described herein for brevity.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

It should be appreciated that the processor of 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 (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, 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 will be appreciated that the memory in embodiments of the application may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memory is illustrative but not restrictive, and for example, the memory in the embodiments of the present application may be Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), direct RAM (DR RAM), and the like. That is, the memory in embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the application also provides a computer readable storage medium for storing a computer program.

Optionally, the computer readable storage medium may be applied to a network device in the embodiment of the present application, and the computer program causes a computer to execute a corresponding flow implemented by the network device in each method in the embodiment of the present application, which is not described herein for brevity.

Optionally, the computer readable storage medium may be applied to a terminal device in the embodiment of the present application, and the computer program causes a computer to execute corresponding processes implemented by a mobile terminal/terminal device in each method of the embodiment of the present application, which are not described herein for brevity.

The embodiment of the application also provides a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to a network device in the embodiment of the present application, and the computer program instructions cause a computer to execute corresponding processes implemented by the network device in each method in the embodiment of the present application, which are not described herein for brevity.

Optionally, the computer program product may be applied to a mobile terminal/terminal device in the embodiment of the present application, and the computer program instructions cause a computer to execute corresponding processes implemented by the mobile terminal/terminal device in each method of the embodiment of the present application, which are not described herein for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to a network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is caused to execute a corresponding flow implemented by the network device in each method in the embodiment of the present application, which is not described herein for brevity.

Optionally, the computer program may be applied to a mobile terminal/terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is caused to execute corresponding processes implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may 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 the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units 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 on 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. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for measuring channel quality in D2D communication, applied to a first terminal, the method comprising:

when the first terminal sends data, a first timer is started or restarted;

and/or the number of the groups of groups,

when the first terminal receives data sent by the second terminal, starting or restarting the first timer;

generating a first message when the first terminal meets a first trigger condition; wherein the first triggering condition includes: the first timer times out; the first message is used for the second terminal to measure the channel quality, or the first message is used for feeding back the channel quality information to the second terminal; the first terminal and the second terminal perform D2D communication;

and sending a first message to the second terminal.

2. The method of claim 1, wherein the first message includes at least a reference signal, the reference signal being used for channel quality measurement.

3. The method of claim 1, wherein the data comprises at least one of:

PSCCH transmitted data, PSSCH transmitted data, PSFCH transmitted data, MAC data PDU, MAC control PDU, RLC data PDU, RLC control PDU, PDCP data PDU, PDCP control PDU, PC5-S PDU, reference signal.

4. A method according to any of claims 1-3, wherein the sending the first message to the second terminal comprises:

5. The method of claim 4, wherein the transmitting N first messages to the second terminal in the first period comprises:

and N first messages are sent to the second terminal at M time-frequency resources in a first period.

6. The method of claim 5, wherein,

m is an integer greater than or equal to N.

7. The method of claim 5, wherein the time-frequency resources are configured by a network side, or by a second terminal, or by a first terminal.

8. The method according to any one of claims 5-7, wherein the sending N first messages to the second terminal in the first period further comprises:

or alternatively, the process may be performed,

and stopping sending the first messages if the N first messages are sent before the first period is finished.

9. The method of any of claims 1-3, 5-7, wherein the first terminal is one of:

a multicast communication group head terminal;

a terminal in configured multicast communication;

group member terminals in multicast communications.

10. The method of any of claims 1-3, 5-7, wherein the method further comprises:

and when the first message contains the reference signal, selecting a resource for transmitting the reference signal.

11. The method of any of claims 1-3, 5-7, wherein the method further comprises:

and when the first message contains the reference signal, filling bits on resources carrying the reference signal.

12. The method of any of claims 1-3, 5-7, wherein the first message is not used to determine a link activity condition between the first terminal and the second terminal.

13. The method of claim 12, wherein the link activity condition characterizes a link between the first and second terminals being active or inactive.

14. The method of claim 13, wherein the method further comprises:

and when the time length of the link between the first terminal and the second terminal in the inactive state reaches the preset time length, releasing the link between the first terminal and the second terminal.

15. A method for measuring channel quality in D2D communication, applied to a second terminal, the method comprising:

receiving a first message sent by a first terminal;

the first message is used for channel quality measurement by the second terminal or is used for feeding back channel quality information to the second terminal; the first terminal and the second terminal perform D2D communication; the first message is generated and sent by the first terminal when a first trigger condition is met; the first trigger condition includes: the first timer times out; the first timer is started or restarted when the first terminal transmits data, and/or the first timer is started or restarted when the first terminal receives the data transmitted by the second terminal.

16. The method of claim 15, wherein the method further comprises:

when a second trigger condition is met, the second terminal releases the connection with the first terminal;

Or when the second trigger condition is met, reporting the link failure by the second terminal.

17. The method of claim 16, wherein the second terminal releases the connection with the first terminal, comprising:

and the second terminal sends a connection release message to the first terminal.

18. The method of claim 16 or 17, wherein the second trigger condition comprises: the second timer times out.

19. The method of claim 18, wherein the method further comprises:

when the second terminal sends data, starting or restarting the second timer;

or alternatively, the process may be performed,

20. The method of claim 19, wherein the data comprises at least one of:

21. The method of any of claims 16-17, wherein the second trigger condition further comprises at least one of:

The first terminal is a group head device in multicast communication;

a terminal in a first state in multicast communication is a first proportion;

all terminals in multicast communication are in a first state;

a terminal configured in multicast communication is in a first state.

22. The method of any of claims 16-17, wherein the second trigger condition further comprises: at least a portion of the carrier, or pool of resources, or resources, is in a first state;

wherein the carrier, or resource pool, or resource is used for communication between the first terminal and the second terminal.

23. The method of claim 22, wherein the at least a portion of a carrier or resource pool or resource is at least one of:

all carriers, or all resource pools, or all resources;

configured carriers, or configured resource pools, or configured resources.

24. The method according to any of claims 15-17, 19, 20, 23, wherein after the receiving the first message from the first terminal, the method further comprises:

When the first message contains a reference signal, the second terminal performs channel measurement according to the reference signal in the first message;

the reference signal is used for channel quality measurement.

25. The method of claim 24, wherein the second terminal performs channel measurement according to the reference signal in the first message, and further comprising:

26. The method of claim 25, wherein the at least one time-frequency resource is configured by a network side, or is preconfigured by a second terminal, or is configured by a first terminal.

27. The method of any one of claims 15-17, 19, 20, 23, 25, 26, wherein the first terminal is one of the following categories:

a multicast communication group head terminal;

a terminal in configured multicast communication;

group member terminals in multicast communications.

28. The method of any of claims 15-17, 19, 20, 23, 25, 26, wherein the first message is not used to determine a link activity condition between the first terminal and the second terminal.

29. The method of claim 28, wherein the link activity condition characterizes a link between the first and second terminals being active or inactive.

30. The method of claim 29, wherein the method further comprises:

31. A first terminal, comprising:

the first processing unit generates a first message when the first trigger condition is met; wherein the first triggering condition includes: the first timer times out; the first message is used for channel quality measurement by a second terminal or is used for feeding back channel quality information to the second terminal; the first terminal and the second terminal perform D2D communication;

a first communication unit that transmits a first message to the second terminal;

the first processing unit is further configured to start or restart the first timer when data is transmitted through the first communication unit; and/or starting or restarting the first timer when the data sent by the second terminal is received through the first communication unit.

32. The first terminal of claim 31, wherein the first message includes at least a reference signal, the reference signal being used for channel quality measurement.

33. The first terminal of claim 31, wherein the data includes at least one of:

34. The first terminal according to any of claims 31-33, wherein the first communication unit sends N first messages to the second terminal in a first period; wherein N is an integer greater than or equal to 1.

35. The first terminal of claim 34, wherein the first communication unit sends N first messages to the second terminal at M time-frequency resources in a first period.

36. The first terminal of claim 35, wherein,

m is an integer greater than or equal to N.

37. The first terminal of claim 36, wherein the time-frequency resources are configured by a network side, or by a second terminal, or by the first terminal.

38. The first terminal according to any of claims 35-37, wherein the first communication unit keeps attempting to send the first message if N transmissions of the first message are not completed before the end of the first period;

or alternatively, the process may be performed,

39. The first terminal of any of claims 31-33, 35-37, wherein the first terminal is one of:

a multicast communication group head terminal;

a terminal in configured multicast communication;

group member terminals in multicast communications.

40. The first terminal according to any of claims 31-33, 35-37, wherein the first processing unit selects a resource for transmitting a reference signal when the reference signal is included in the first message.

41. The first terminal according to any of claims 31-33, 35-37, wherein the first processing unit performs padding bits on resources carrying the reference signal when the reference signal is included in the first message.

42. The first terminal according to any of claims 31-33, 35-37, wherein the first message is not used to determine a link activity situation between the first terminal and the second terminal.

43. The first terminal of claim 42, wherein the link activity condition characterizes a link between the first terminal and a second terminal as being active or inactive.

44. The first terminal of claim 43, wherein the first processing unit,

and when the time length of the link between the first terminal and the second terminal in the inactive state reaches a preset time length, controlling the first communication unit to release the link between the first terminal and the second terminal.

45. A second terminal, comprising:

46. The second terminal of claim 45, wherein the second terminal further comprises:

the second processing unit is used for controlling the second communication unit to release the connection with the first terminal when the second triggering condition is met; or when the second trigger condition is met, reporting the link failure by the second terminal.

47. The second terminal as claimed in claim 46, wherein the second communication unit transmits a connection release message to the first terminal.

48. The second terminal according to claim 46 or 47, wherein the second trigger condition comprises: the second timer times out.

49. The second terminal of claim 48, wherein the second processing unit,

starting or restarting the second timer when the second communication unit transmits data;

or alternatively, the process may be performed,

and when the second communication unit receives the data sent by the first terminal, starting or restarting the second timer.

50. The second terminal of claim 49, wherein the data includes at least one of:

51. The second terminal according to any of claims 46-47, 49, 50, wherein said second trigger condition further comprises at least one of:

the first terminal is a group head device in multicast communication;

a terminal in a first state in multicast communication is a first proportion;

all terminals in multicast communication are in a first state;

a terminal configured in multicast communication is in a first state.

52. The second terminal according to any of claims 46-47, 49, 50, wherein the second trigger condition further comprises: at least a portion of the carrier, or pool of resources, or resources, is in a first state;

53. The second terminal of claim 52, wherein the at least a portion of the carrier or resource pool or resource is at least one of:

all carriers, or all resource pools, or all resources;

Configured carriers, or configured resource pools, or configured resources.

54. The second terminal according to any of claims 45-47, 49, 50, 53, wherein the second communication unit performs channel measurements from reference signals in the first message when the first message contains reference signals;

the reference signal is used for channel quality measurement.

55. The second terminal of claim 54, wherein the second communication unit feeds back at least one channel quality information to the first terminal at least one time-frequency resource in a second period.

56. The second terminal of claim 55, wherein the at least one time-frequency resource is configured by the network side, or is preconfigured by the second terminal, or is configured by the first terminal.

57. The second terminal of any of claims 45-47, 49, 50, 53, 55, 56, wherein the first terminal is one of:

a multicast communication group head terminal;

a terminal in configured multicast communication;

group member terminals in multicast communications.

58. The second terminal of any of claims 46-47, 49, 50, 53, 55, 56, wherein the first message is not used to determine link activity between the first terminal and the second terminal.

59. The second terminal as in claim 58, wherein the link activity condition characterizes a link between the first and second terminals as being active or inactive.

60. The second terminal of claim 59, wherein the second processing unit,

and when the time length of the link between the first terminal and the second terminal in the inactive state reaches a preset time length, controlling the second communication unit to release the link between the first terminal and the second terminal.

61. A terminal, comprising: a processor and a memory for storing a computer program capable of running on the processor,

wherein the memory is adapted to store a computer program, said processor being adapted to invoke and run the computer program stored in said memory, performing the steps of the method according to any of claims 1-30.

62. A chip, comprising: a processor for calling and running a computer program from a memory, causing a device on which the chip is mounted to perform the method of any of claims 1-30.

63. A computer readable storage medium for storing a computer program which causes a computer to perform the steps of the method of any one of claims 1-30.

64. A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 1-30.