CN112399372A

CN112399372A - Communication method, terminal and network equipment

Info

Publication number: CN112399372A
Application number: CN201910755650.XA
Authority: CN
Inventors: 张向东; 常俊仁
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2021-02-23
Also published as: WO2021027900A1

Abstract

The embodiment of the application discloses a communication method, a terminal and network equipment, relates to the field of communication, and solves the problem that when SL path loss is larger than DL path loss, the terminal cannot meet communication requirements due to V2X communication with lower transmitting power. The specific scheme is as follows: the terminal sends first indication information to the network equipment, wherein the first indication information comprises at least one of the following information: SL path loss, DL path loss, and the relationship between SL path loss and DL path loss. The terminal receives second indication information from the network equipment, wherein the second indication information is used for indicating the terminal to carry out SL communication.

Description

Communication method, terminal and network equipment

Technical Field

The present application relates to the field of communications, and in particular, to a communication method, a terminal, and a network device.

Background

Vehicle to other device communication (V2X) based on Side Link (SL) may support power control not based on feedback, i.e. open loop power control. In the open-loop power control calculation process, the corresponding path loss needs to be compensated to ensure the quality of V2X communication. It can be understood that in the SL communication based on the side link, the larger the transmission power of the terminal is, the better the communication quality is. Currently, when the transmit power is calculated based on open-loop power control in SL communication, the compensation of the path loss may be configured to perform compensation only using the SL path loss, may be configured to perform compensation only using the Downlink (DL) path loss, and may be configured to perform compensation using both the SL path loss and the DL path loss.

Since the SL communication between the terminals may interfere with the Uu interface-based communication between the terminals and the base station, when it is configured that either the SL path loss or the DL path loss may be used to compensate the transmission power, the terminals may calculate the transmission power calculated from the SL path loss and the transmission power calculated from the DL path loss, respectively, and use the smaller of the two transmission powers for the SL communication.

This may cause the SL communication to fail to meet the communication requirements (e.g., poor communication quality or communication disconnection) due to the transmission power being too low. For example, when the transmission power calculated from the SL path loss is larger than the transmission power calculated from the DL path loss, the SL communication is performed using the relatively small transmission power obtained from the DL path loss calculation, so that there is a problem that the transmission power is insufficient for the normal SL communication. Generally, the transmission power obtained according to the larger path loss compensation is larger, for example, when the SL path loss is larger than the DL path loss, the transmission power obtained according to the SL path loss compensation is generally larger than the transmission power obtained according to the DL path loss compensation, whereas when the DL path loss is larger than the SL path loss, the transmission power obtained according to the DL path loss compensation is generally larger than the transmission power obtained according to the SL path loss compensation.

Therefore, a solution is needed to at least solve the problem that when the SL path loss is larger than the DL path loss, the terminal performs V2X communication with lower transmission power, which results in that the communication requirement cannot be met.

Disclosure of Invention

The embodiment of the application provides a communication method and device, which can at least solve the problem that when the SL path loss is greater than the DL path loss, the terminal performs V2X communication with lower transmitting power, so that the communication requirement cannot be met.

In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions:

in a first aspect, an embodiment of the present application provides a communication method, which may include: the terminal sends first indication information to the network equipment, wherein the first indication information comprises at least one of the following information: SL path loss, DL path loss, and the relationship between SL path loss and DL path loss; and the terminal receives second indication information from the network equipment, wherein the second indication information is used for indicating the terminal to carry out SL communication.

By adopting the technical scheme, the terminal can send the path loss condition in the SL communication process to the network equipment through the first indication information, so that the network equipment can know the current SL communication state (such as the SL communication quality, whether the problem of disconnection exists, and the like) according to the first indication information. The terminal may further receive second indication information from the network device for performing the SL communication, so as to ensure normal performance of the SL communication.

In one possible design, the terminal sends the first indication information to the network device, where the first indication information includes: when determining that the SL path loss is greater than a first value, the terminal sends first indication information to the network equipment, wherein the first value is the DL path loss or is determined according to the DL path loss; or when determining that the SL path loss is always greater than a second value within the preset time, the terminal sends first indication information to the network equipment, wherein the second value is the DL path loss or is determined according to the DL path loss; or, when determining that the RLF and the SL path loss are greater than a third value, the terminal sends the first indication information to the network device, where the third value is the DL path loss or is determined according to the DL path loss. Based on the method, the terminal can send the first indication information to the network device according to the preset condition, so that the network device can know the current state of the SL communication when the SL transmission power is low.

In one possible design, the sending, by the terminal, the first indication information to the network device may include: the terminal periodically transmits first indication information to the network equipment. Based on the method, the terminal can report the related parameters of the current SL communication to the network equipment periodically.

In one possible design, the second indication information includes transmission resources required for SL communication, and the transmission resources include frequency domain resources and/or time domain resources. Based on the method, the terminal can perform coverage enhancement of frequency domain and/or time domain on more resources allocated by the network equipment for the current SL communication so as to improve the SL communication quality.

In one possible design, the second indication information includes a power control parameter, and the method further includes: and the terminal adopts the SL transmitting power determined according to the power control parameter to carry out SL communication. Based on the method, the terminal can determine the SL transmitting power again for SL communication according to the power control parameter redistributed by the network equipment for the current SL communication so as to improve the SL communication quality.

In one possible design, the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information indicates a SL dedicated carrier; the method further comprises the following steps: the terminal carries out SL communication on the SL dedicated carrier according to the dedicated carrier information; or, the second indication information comprises a handover indication; the method further comprises the following steps: and the terminal switches the carrier wave according to the switching indication. Based on the method, the terminal can switch the current SL communication to the SL dedicated carrier allocated by the network equipment or allocated in advance for communication, so as to improve the SL communication quality.

In a second aspect, the present application provides a communication device, which may be a chip in a terminal or a system on a chip. The communication device may implement the functions performed by the terminal in the first aspect or the possible designs of the first aspect, and the functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. Such as: the communication apparatus may include: a transmitting module and a receiving module; for example, the sending module may send data or information to other devices besides the terminal, for example, the sending module may be configured to send the first indication information to the network device. The receiving module may be configured to receive data or information sent by a device other than the terminal, for example, the receiving module may be configured to receive the second indication information from the network device.

In a third aspect, the present application provides a communication apparatus comprising: a processor and a memory; the memory is configured to store computer executable instructions that, when executed by the processor, cause the communication device to perform the communication method as set forth in the first aspect or any one of the possible designs of the first aspect.

In a fourth aspect, the present application provides a computer-readable storage medium having stored therein instructions that, when executed, perform the communication method of the first aspect or any one of the possible designs of the first aspect.

In a fifth aspect, the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the communication method of the first aspect described above or of any one of the possible designs of the first aspect described above.

In a sixth aspect, the present application provides a chip system, where the chip system includes a processor and a communication interface, and is used to support the terminal to implement the functions referred to in the foregoing aspects, for example, the processor sends first indication information to a device (e.g., a network device) other than the terminal through some communication interfaces, and receives second indication information sent by the device (e.g., the network device) other than the terminal through some other communication interfaces. In one possible design, the system-on-chip further includes a memory for storing program instructions and data necessary for the terminal. The chip system may be constituted by a chip, or may include a chip and other discrete devices.

For an exemplary technical effect brought by any design manner of the second aspect to the sixth aspect, reference may be made to the technical effect brought by the first aspect or any possible design of the first aspect, and details are not described here again.

In a seventh aspect, a communication method is provided, where the method further includes: the network equipment receives first indication information from a terminal, wherein the first indication information comprises at least one of the following information: SL path loss, DL path loss, and the relationship between SL path loss and DL path loss; and the network equipment sends second indication information to the terminal, wherein the second indication information is used for indicating the terminal to carry out SL communication.

Based on the method, the network equipment can know the state of the current SL communication through the first indication information, determine whether to adjust the current SL communication and how to adjust the current SL communication, and instruct the terminal to carry out the SL communication through the second indication information so as to ensure the normal operation of the SL communication.

In one possible design, the network device sends the second indication information to the terminal, where the second indication information includes: when determining that the SL path loss is larger than a first value, the network equipment sends second indication information to the terminal, wherein the first value is DL path loss or is determined according to the DL path loss; or, when determining that the SL path loss is always greater than a second value within the preset time, the network device sends second indication information to the terminal, where the second value is the DL path loss or is determined according to the DL path loss. Based on the method, the network device may determine whether to send the second indication information to the terminal according to a relationship between the SL path loss and the first value or the second value in the current SL communication.

In one possible design, the second indication information includes transmission resources required for SL communication, and the transmission resources include frequency domain resources and/or time domain resources. Based on the method, the network device can allocate transmission resources required for SL communication for the current SL communication and send the transmission resources to the terminal through the second indication information, so that the terminal can perform coverage enhancement on the transmission resources to improve the SL communication quality.

In one possible design, the second indication information includes a power control parameter. Based on the method, the network device can send the power control parameter to the terminal through the second indication information, so that the terminal can adjust the SL transmitting power according to the power control parameter, and the SL communication quality is improved.

In one possible design, the second indication information includes dedicated carrier information, the dedicated carrier information indicating the SL dedicated carrier; or, the second indication information includes a handover indication, and the handover indication is used for indicating the terminal to switch the carrier. Based on the method, the network equipment instructs the terminal to switch the current SL communication to the SL dedicated carrier through the second instruction information. For example, the SL dedicated carrier may be preset, and the terminal may be instructed to switch the carrier of the SL communication by the second instruction information. The SL dedicated carrier may also be allocated by the network device for the terminal, and is issued to the terminal through the second indication information, so that the terminal switches the carrier for SL communication.

In an eighth aspect, the present application provides a communication apparatus, which may be a chip or a system on a chip in a network device. The communication apparatus may implement the functions performed by the network device in the seventh aspect or the possible designs in the seventh aspect, and the functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. Such as: the communication apparatus may include: a receiving module and a sending module; for example, the receiving module may be configured to receive data or information sent by a device other than the network device, for example, the receiving module may be configured to receive the first indication information from the terminal. The sending module may send data or information to other devices besides the network device, for example, the sending module may be configured to send the second indication information to the terminal.

In a ninth aspect, the present application provides a communication apparatus comprising: a processor and a memory; the memory is configured to store computer-executable instructions, and when the communication apparatus is running, the processor executes the computer-executable instructions stored by the memory to cause the network device to perform the communication method according to any one of the possible designs of the seventh aspect or the seventh aspect.

In a tenth aspect, the present application provides a computer-readable storage medium having stored therein instructions that, when executed, perform any one of the possible designed communication methods of the seventh aspect or the seventh aspect.

In an eleventh aspect, the present application provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the communication method of any one of the possible designs of the seventh aspect or the seventh aspect described above.

In a twelfth aspect, the present application provides a chip system, where the chip system includes a processor and a communication interface, and is used to support a communication apparatus to implement the functions recited in the above aspects, for example, the processor sends the second indication information to a device (e.g., a terminal) other than the network device through some communication interfaces, and further, for example, the processor receives the first indication information sent by the device (e.g., the terminal) other than the network device through some other communication interfaces. In one possible design, the system-on-chip further includes a memory, which stores program instructions and data necessary for the network device. The chip system may be constituted by a chip, or may include a chip and other discrete devices.

For example, the technical effect brought by any design manner of the eighth aspect to the twelfth aspect may refer to the technical effect brought by any possible design of the seventh aspect or the seventh aspect, and is not described herein again.

In a thirteenth aspect, the present application provides a method of communication, the method comprising: a first layer entity of a terminal sends first indication information to a second layer entity of the terminal, wherein the first indication information comprises at least one of the following information: SL path loss, DL path loss, and the relationship between SL path loss and DL path loss; and the second layer entity of the terminal sends second indication information to the first layer entity of the terminal, and the second indication information is used for the terminal to carry out SL communication.

Based on the method, the second layer entity of the terminal can know the current SL communication condition and send the second indication information to the first layer entity according to the condition, so that the first layer entity can carry out SL communication according to the second indication information, and the communication quality of the current SL communication is improved.

In one possible design, the sending, by the first layer entity of the terminal, the first indication information to the second layer entity of the terminal includes: when determining that the SL path loss is greater than a first value, a first layer entity of the terminal sends first indication information to a second layer entity of the terminal, wherein the first value is the DL path loss or is determined according to the DL path loss; or when determining that the SL path loss is always greater than a second value within the preset time, the first layer entity of the terminal sends first indication information to a second layer entity of the terminal, wherein the second value is the DL path loss or is determined according to the DL path loss; or, when the first layer entity of the terminal determines that the RLF and the SL path loss are greater than a third value, the first layer entity of the terminal sends the first indication information to the second layer entity of the terminal, and the third value is the DL path loss or is determined according to the DL path loss. Based on the method, the first layer entity of the terminal may send the first indication information to the first layer entity according to a preset condition, so that the first layer entity may know the current state of the SL communication when the SL transmission power is small.

In one possible design, the sending, by the first layer entity of the terminal, the first indication information to the second layer entity of the terminal includes: the first layer entity of the terminal periodically sends the first indication information to the second layer entity of the terminal. Based on the method, the first layer entity may report the relevant parameters of the current SL communication to the second layer entity periodically.

In one possible design, the sending, by the second layer entity of the terminal, the second indication information to the first layer entity of the terminal includes: when determining that the SL path loss is greater than a first value, a second layer entity of the terminal sends second indication information to the terminal, wherein the first value is the DL path loss or is determined according to the DL path loss; or when determining that the SL path loss is always greater than a second value within the preset time, the second layer entity of the terminal sends second indication information to the terminal, where the second value is the DL path loss or is determined according to the DL path loss. Based on the method, the second layer entity may determine whether to send the second indication information to the first layer entity according to a relationship between the SL path loss and the DL path loss or the first value or the second value in the current SL communication.

In one possible design, the second indication information includes transmission resources required for SL communication, and the transmission resources include frequency domain resources and/or time domain resources. Based on the method, the second layer entity can allocate transmission resources required for SL communication for the current SL communication and send the transmission resources to the first layer entity through the second indication information, so that the first layer entity can perform coverage enhancement on the transmission resources to improve the SL communication quality.

In one possible design, the second indication information includes a power control parameter, and the method further includes: and the first layer entity of the terminal adopts the SL transmitting power determined according to the power control parameter to carry out SL communication. Based on the method, the second layer entity may issue second indication information including the power control parameter to the first layer entity, so that the first layer entity can adjust the SL transmission power according to the power control parameter to improve the SL communication quality.

In one possible design, the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information indicates a SL dedicated carrier; the method further comprises the following steps: a first layer entity of the terminal carries out SL communication on the SL dedicated carrier according to the dedicated carrier information; or, the second indication information includes a handover indication, and the handover indication is used for indicating the terminal to switch the carrier; the method further comprises the following steps: and the first layer entity of the terminal switches the carrier wave according to the switching indication. Based on the method, the second layer entity instructs the first layer entity to switch the current SL communication to the SL dedicated carrier through the second indication information. For example, the SL dedicated carrier may be preset and instruct the first layer entity to switch the carrier for SL communication through the second indication information. The SL dedicated carrier may also be a carrier allocated by the second layer entity to the first layer entity and issued to the first layer entity through the second indication information, so that the first layer entity switches the SL communication.

In a fourteenth aspect, the present application provides a communication apparatus, which may be a terminal or a chip in a terminal or a system on a chip. The communication device may implement the functions performed by the terminal in the above thirteenth aspect or the possible designs in the thirteenth aspect, and the functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. Such as: the communication apparatus may include: the device comprises a first processing module and a second processing module; illustratively, the first processing module has a function of a first layer entity in the terminal, for example, the first processing module has a function of an Access Stratum (AS layer) in the terminal device. The second processing module has functions of a second layer entity in the terminal device, for example, the second processing module has functions of a PC5-S layer, a V2X layer, and an application layer in the terminal device.

In a fifteenth aspect, the present application provides a communications apparatus, comprising: a processor and a memory; the memory is used for storing computer-executable instructions, and when the communication device is operated, the processor executes the computer-executable instructions stored by the memory, so as to enable the terminal to execute the communication method according to any one of the possible designs of the thirteenth aspect or the thirteenth aspect.

In a sixteenth aspect, the present application provides a computer-readable storage medium having stored therein instructions that, when executed, perform the communication method of any one of the possible designs of the thirteenth aspect or the thirteenth aspect.

In a seventeenth aspect, the present application provides a computer program product containing instructions that, when run on a computer, causes the computer to perform the communication method of any of the possible designs of the thirteenth aspect or the thirteenth aspect described above.

In an eighteenth aspect, the present application provides a chip system, which includes a processor and a communication interface, and is configured to support a terminal to implement the functions recited in the foregoing aspects. In one possible design, the system-on-chip further includes a memory for storing program instructions and data necessary for the terminal. The chip system may be constituted by a chip, or may include a chip and other discrete devices.

For an exemplary technical effect brought by any design manner of the fourteenth aspect to the eighteenth aspect, reference may be made to the technical effect brought by any possible design manner of the thirteenth aspect or the thirteenth aspect, and details are not described here.

In a nineteenth aspect, the present application provides a communication system that may include one or more terminals and/or one or more network devices. Illustratively, one or more terminals may be adapted to perform the communication method as provided in the first aspect, any one of the possible designs of the first aspect, the thirteenth aspect, or any one of the possible designs of the thirteenth aspect, above. One or more network devices may be used to perform the communication method of the seventh aspect or any of the possible designs of the seventh aspect.

Drawings

Fig. 1 is a schematic view of a SL communication scenario provided in the prior art;

fig. 2 is a schematic diagram of another SL communication scenario provided by the prior art;

fig. 3 is a schematic diagram of a network architecture according to an embodiment of the present application;

fig. 4 is a schematic diagram of another network architecture provided in the embodiment of the present application;

fig. 5 is a schematic diagram of a logic composition of a terminal provided in the present application;

fig. 6 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 7 is a flowchart illustrating another communication method according to an embodiment of the present application;

fig. 8 is a schematic diagram illustrating a communication device according to an embodiment of the present disclosure;

fig. 9 is a schematic diagram of another communication device according to an embodiment of the present disclosure;

fig. 10 is a schematic diagram of another communication device according to an embodiment of the present disclosure;

fig. 11 is a schematic diagram of another communication device according to an embodiment of the present disclosure;

fig. 12 is a schematic composition diagram of a chip system according to an embodiment of the present disclosure;

fig. 13 is a schematic diagram of another communication device according to an embodiment of the present disclosure;

fig. 14 is a schematic composition diagram of a chip system according to an embodiment of the present disclosure.

Detailed Description

In order to clarify the technical solutions in the description of the embodiments, the terms related to the embodiments of the present application are explained below:

1) a terminal, also referred to as User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc., is a device that provides voice/data connectivity to a user. For example, a handheld device having a wireless connection function, or a vehicle-mounted device, etc. Currently, some examples of terminals are: a vehicle-mounted computer, a mobile phone (mobile phone), a tablet computer, a notebook computer, a palm computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like.

2) Universal Mobile Telecommunications network (UMTS) is a 3G Mobile communication technology standard established by The 3rd Generation Partnership Project (3 GPP) organization, and Long Term Evolution (LTE) of Universal Mobile Telecommunications is a Long Term Evolution of The UMTS technology standard established by The 3GPP organization. Because of the evolution, we refer to the LTE Access Network portion as Evolved UMTS Terrestrial Radio Access Network (E-UTRAN). Correspondingly, the LTE Core network portion may be referred to as an Evolved Packet Core (EPC). In distinction to the 3G and 4G communication technology standards, the 5G access network part is referred to as NG-RAN and the 5G core network part is referred to as 5 GC.

3) Mobility Management Entity (MME) is a key control node of a 3GPP protocol LTE access network, and is responsible for positioning idle mode ue (user equipment) and paging process, including relaying. In short, the MME is responsible for the signaling processing. The Serving GateWay (S-GW) is a GateWay that terminates at the E-UTRAN interface, and the main functions of the S-GW may include, for example: when switching between eNBs, the eNB can be used as a local anchor point and assist in completing the reordering function of the eNBs; when switching among different access networks of 3GPP, the method is used as a mobility anchor point and also has a reordering function; performing a lawful interception function; routing and forwarding the data packet; grouping and marking are carried out on an uplink transmission layer and a downlink transmission layer; in idle state, the downlink packet buffer and the service request function triggered by the initiation network; for inter-operator charging, etc.

4) A network device is a device in a wireless network, such as a Radio Access Network (RAN) node that accesses a terminal to the wireless network. Currently, some examples of RAN nodes are: a gbb, ng-eNB, a Transmission Reception Point (TRP), an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved NodeB or home Node B, HNB), a Base Band Unit (BBU), a Roadside Unit (RSU), or a wireless fidelity (Wifi) Access Point (AP), etc.

5) Vehicle and other equipment communication: i.e., V2X communication, may be applied in a transportation network. V2X communication may include Vehicle to Vehicle (V2V) communication, Vehicle to roadside Infrastructure (V2I) communication, and Vehicle to pedestrian (V2P) communication. Among them, V2V communication may be performed on a sidelink (sidelink), and V2I communication may be performed on a Downlink (DL).

6) And SL communication: sidelink-based communications. SL communication may transmit data on a Physical SL Control Channel (PSCCH) and/or a physical SL shared Channel (PSCCH). For example, the SL communication link refers to a wireless communication link between the terminal device and the terminal device, and may be a wireless communication link between a communication device of a vehicle and a communication device of another vehicle in V2X communication.

7) And Uu port communication: the communication between the Uu port-based terminal and the network device may include DL communication.

8) And road loss: the present application relates to SL path loss and DL path loss. The SL path loss is a data propagation loss between terminals in SL communication. The DL path loss is a data propagation loss between the terminal and the network device in DL communication. The size of the path loss is in positive correlation with the distance between the devices. The larger the distance between terminals, the larger the SL path loss. As another example, the greater the distance between the terminal and the network device (e.g., base station), the greater the DL path loss.

9) SL transmission power: and in the SL communication process, the terminal initiates the transmitting power adopted when the SL communication is carried out. The SL transmit power may include the PSCCH and/or PSCCH, as well as the transmit power of signals or channels on other SL links.

In addition, in the embodiments of the present application, "a plurality" means two or more, and other terms are similar thereto. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Furthermore, for elements (elements) that appear in the singular form "a," an, "and" the, "they are not intended to mean" one or only one "unless the context clearly dictates otherwise, but rather" one or more than one. For example, "a device" means for one or more such devices. Still further, at least one (at least one of a).

In V2X communication, when a terminal initiates SL communication, the terminal first needs to determine the SL transmit power. Illustratively, the transmit power of the PSCCH and PSCCH may be determined by the following equations (1) and (2), respectively.

P_PSSCH＝min{P_CMAX,PSSCH,10log₁₀(M_PSSCH)+P_{0_PSSCH,1}+α_PSSCH,1PL … … formula (1)

Wherein, P_PSSCHFor the transmission power of PSSCH, P_CMAX,PSSCHFor a preconfigured maximum transmit power, M, on the PSSCH_PSSCHNumber of resources, P, allocated for PSSCH by network device_{0_PSSCH,1}For the desired received power, α, of the receiving terminal on the PSCCH in SL communications_PSSCH,1Is a path loss compensation coefficient, and PL is a path loss compensation value. The receiving terminal is a terminal for receiving data in SL communication.

P_PSCCH＝min{P_CMAX,PSCCH,10log₁₀(M_PSCCH)+P_{0_PSCCH,1}+α_PSCCH,1PL … … formula (2)

Wherein, P_PSCCHFor the transmit power, P, of the PSCCH_CMAX,PSCCHFor a preconfigured maximum transmit power, M, on the PSCCH_PSCCHNumber of resources, P, allocated for PSCCH by network device_{0_PSCCH,1}For receiving the expected received power, alpha, of a terminal on the PSSCH in SL communication_PSCCH,1The PL is a path loss compensation value.

It can be seen that the SL transmitting power is the compensation value of the path loss and other power control parameters (such as P) when the SL communication is started_CMAX，M，P₀Or alpha) is determined. The SL transmit power is specifically compensated by using the SL path loss or the DL path loss, and may be determined according to a pre-configured compensation strategy.

It should be noted that, in this embodiment, the compensation of the SL transmit power by using the SL path loss means that the path loss compensation value when determining the SL transmit power is the value of the SL path loss. And compensating the SL transmitting power by adopting DL path loss, namely determining a path loss compensation value when the SL transmitting power is determined as a DL path loss value.

For example, the compensation strategy may be to compensate the SL transmit power by using the SL path loss or only using the SL path loss, may also be to compensate the SL transmit power by using the DL path loss or only using the DL path loss, and may also be to compensate the SL transmit power by using both the SL path loss and the DL path loss. In order to reduce the interference of the SL communication to the Uu port communication, when the compensation strategy is that both the SL path loss and the DL path loss can compensate the SL transmission power, the terminal selects the smaller SL transmission power from the SL transmission power obtained by the calculation of the DL path loss and the SL transmission power obtained by the calculation of the SL path loss, and initiates the SL communication.

This may result in the transmit power being too low to meet the communication requirements when the SL communication is initiated with a lower SL transmit power.

For example, please refer to fig. 1 for the case when terminal 1 and terminal 2 are within the coverage of the same network device. When the terminal 1 wants to initiate SL communication to the terminal 2, if the SL path loss is greater than the DL path loss, the terminal 1 at least needs to initiate SL communication with the SL transmission power obtained according to the SL path loss compensation, so as to ensure that the requirements of SL communication are met. At this time, if the SL communication is initiated by using the SL transmission power obtained according to the DL path loss compensation in order to reduce the interference to the Uu port communication, the situation that the transmission power is too small will inevitably occur. When the terminal 2 wants to initiate SL communication to the terminal 1, similarly, if the SL path loss is larger than the DL path loss between the terminal 2 and the network device, and if the terminal 2 initiates SL communication with SL transmission power obtained according to the DL path loss compensation between the terminal 2 and the network device in order to reduce interference to Uu port communication, the situation that the transmission power is too small may also occur.

For another example, please refer to fig. 2 when terminal 1 and terminal 2 are in the coverage areas of different network devices. It is assumed that terminal 1 is in the coverage of network device 1, terminal 2 is in the coverage of network device 2, the path loss between terminal 1 and network device 1 is DL path loss 1, the path loss between terminal 2 and network device 2 is DL path loss 2, and the path loss between terminal 1 and terminal 2 is SL path loss. Then, when the terminal 1 wants to initiate SL communication to the terminal 2, if the SL path loss is larger than the DL path loss 1 and the terminal 1 initiates SL communication with the SL transmission power obtained by compensating for the DL path loss 1, the SL transmission power is too small to guarantee the requirements of SL communication. Similarly, when terminal 2 wants to initiate SL communication to terminal 1, if the SL path loss is greater than DL path loss 2 and terminal 2 initiates SL communication with SL transmission power obtained by compensating for DL path loss 2, the SL transmission power cannot guarantee the requirements of SL communication.

Therefore, when the SL path loss is larger than the DL path loss, the SL transmission power may be too small to meet the requirements (for example, the SL communication quality is poor or the SL communication is disconnected).

In order to solve the above problem, embodiments of the present application provide a communication method, which can effectively ensure SL communication quality.

The communication method provided by the present application is described in detail below with reference to the accompanying drawings.

Please refer to fig. 3, which is a schematic diagram of a network architecture according to an embodiment of the present application. Taking an LTE network as an example, the network architecture may include E-UTRAN for providing terminal-oriented E-UTRA user plane and control plane protocol terminations, and EPC for call signaling control and bearer establishment, as an example. The E-UTRAN may consist of one or more enbs, while the EPC may include one or more S-GWs and MMEs. The enbs may be connected to each other through an X2 interface. The eNBs in the E-UTRAN may be connected to the MME through the S1-MME interface and to the S-GW through the S1-U interface.

Please refer to fig. 4, which is a schematic diagram of another network architecture according to an embodiment of the present application. Taking a 5G network as an example, the network architecture may include a NG-RAN composed of one or more gnbs and/or one or more NG-enbs, and a 5GC composed of one or more Access and Mobility Management Function (AMF) and/or one or more User Plane Function (UPF). Wherein, the gNB can provide a New Radio (NR) user plane and a control plane protocol terminal facing the terminal, and the ng-eNB provides an E-UTRA user plane and a control plane protocol terminal facing the terminal. The gNB and the NG-NB can be connected with each other through an Xn interface, and both the gNB and the NG-NB can be connected to the 5GC through an NG interface.

Please refer to fig. 5, which is a schematic diagram of a logic composition of a terminal according to the present application. The terminal includes at least a first layer entity and a second layer entity. The first layer entity may be an access stratum (AS layer), or a specific protocol layer within the access stratum, such AS an RRC layer, and the second layer entity may be a PC5-S layer, a V2X layer, or an application layer. AS an example, AS shown in fig. 5, the terminal may include a first layer entity and a second layer entity, wherein the first layer entity may include an AS layer, and the second layer entity may include a PC5-S layer, a V2X layer, and an application layer.

Illustratively, the AS layer may be a protocol layer related to radio interface access, such AS RRC, PDCP, RLC, MAC, PHY layer, and the like. The PC5-S layer may be a signaling protocol layer of the PC5 port that can be used to complete connection establishment of the PC5 port. The V2X layer may be a V2X related management protocol entity. Illustratively, the functions of the V2X layer data plane include mapping data prior to the 3GPP protocol layer to data that can be processed by the 3GPP protocol for processing by the 3GPP protocol layer. The PC5-S layer may be a signaling protocol layer of the PC5 port, and can be used to complete connection establishment of the PC5 port. In some embodiments, the PC5-S layer may be a subset of the V2X layer, e.g., the PC5-S layer may be a control plane protocol of the V2X layer.

In the embodiment of the present application, the AS layer may be used for SL communication with other terminals. In the process of the terminal performing SL communication, the AS layer may also be configured to obtain SL path loss between the terminal and another terminal, and DL path loss between the terminal and the network device. In some cases, the AS layer may also be used to determine the magnitude relationship between the SL path loss and the DL path loss. The AS layer may also be configured to report first indication information to the V2X layer, where the first indication information may include SL path loss and/or DL path loss obtained by the AS layer entity, and the first indication information may also include a size relationship between the SL path loss and the DL path loss determined by the AS layer.

The V2X layer may be configured to process information reported by the AS layer, for example, the information may be the first indication information reported by the AS layer. The V2X layer may also determine and issue information to the AS layer for SL communication by the AS layer based on the information. In some cases, the V2X layer may store information such as transmission resources or power control parameters for SL communication or SL dedicated carrier in advance, and the SL dedicated carrier may be a V2X dedicated carrier.

It should be noted that the logical composition of the terminal and the naming of the layers (e.g., AS layer, V2X layer, etc.) shown in fig. 5 are only an example provided in this embodiment. In other embodiments, the logical composition of the terminal may include more or fewer layers than shown, and the layers may take on other designations.

The communication method provided by the embodiment of the application can be realized based on the terminal shown in fig. 5. The communication method provided by the embodiment of the application can be applied to V2X communication. The network for supporting V2X communication may be any mobile communication network, such as the network shown in fig. 3 or fig. 4. In addition, the technical solution of the present embodiment can be applied to any scenario of V2X communication, such as the scenario shown in fig. 1 or fig. 2.

For more clearly explaining the embodiments of the present application, the following examples are all explained in the case that the terminal is configured to compensate the SL transmission power by both the SL path loss and the DL path loss, and the transmission power initiates the SL communication with the smaller transmission power obtained by the above two path loss compensations.

Please refer to fig. 6, which is a flowchart illustrating a communication method according to an embodiment of the present application. The method may include S601-S604.

S601, the terminal sends first indication information to the network equipment, wherein the first indication information comprises at least one of the following information: SL path loss, DL path loss, and the relationship between SL path loss and DL path loss.

For example, the SL path loss included in the first indication information may be a value of the SL path loss, or may reflect a measured value of the SL path loss, such as RSRP (Reference Signal Receiving Power) or RSRQ (Reference Signal Receiving Quality) of the channel, and the like. The DL path loss included in the first indication information may be a value of DL path loss, or may reflect a measurement value of SL path loss, such as RSRP or RSRQ equivalent of a channel. The magnitude relationship between the SL path loss and the DL path loss included in the first indication information may be a magnitude relationship between a value of the SL path loss and a value of the DL path loss, for example, the SL path loss is greater than the DL path loss or the DL path loss is greater than the SL path loss.

It can be understood that, when the SL path loss is greater than the DL path loss, in order to reduce interference to the Uu port communication, the terminal may initiate SL communication using the SL transmission power obtained by compensating for the DL path loss. This may be the case if the SL transmit power is insufficient for SL communication, and the terminal may send this to the network device.

In the embodiment of the application, the terminal may send the first indication information to the network device when the preset condition is triggered.

In some embodiments, the terminal may send the first indication information to the network device when determining that the SL path loss is greater than the first value. The first value may be a DL path loss, or may be a value determined according to the DL path loss, for example, the first value is equal to the DL path loss minus a preset threshold.

In other embodiments, the terminal may set a timer. The terminal may control the timer to start timing from the time when the terminal determines that the SL path loss is greater than the second value for the first time, and if it is determined that the SL path loss is always greater than the DL path loss before the timer expires (i.e., within a preset time), so as to determine that the case that the SL path loss is greater than the DL path loss actually and stably occurs, the terminal may send the first indication information to the network device when the timer expires. The second value may be DL path loss, or may be a value determined according to DL path loss, for example, the second value is equal to DL path loss minus a preset threshold.

In some other embodiments, the terminal may monitor for occurrence of Radio Link Failure (RLF), and when the terminal determines that RLF occurs and the reason for the RLF occurs is that the SL path loss is greater than the third value, the terminal may send the first indication information to the network device to indicate the reason for the RLF to the network, for example, that the SL path loss is greater than the third value. The third value may be a DL path loss, or a value determined according to the DL path loss, for example, the third value is equal to the DL path loss minus a preset threshold.

In the above example, the first value, the second value, and the third value may be the same or different. Since the SL path loss and the DL path loss change with changes in the relative position between the terminals and the network device, the terminals may appropriately advance the time when the first indication information is transmitted in order to more accurately and timely transmit the first indication information. Therefore, the first, second and third values may not be equal to but smaller than the DL path loss.

In the embodiment of the present application, in addition to the methods for sending the first indication information according to the preset conditions, other methods for sending the first indication information are also provided. For example, the terminal may send the first indication information to the network device when determining that any one of the preset conditions is satisfied, and when determining that the SL transmission power obtained according to the DL compensation is adopted when initiating the SL communication (for example, according to the configuration, and the SL path loss and DL path loss contrast relationship, selecting the DL path loss as the SL transmission power calculation). For another example, the terminal may periodically send the first indication information to the network device according to a preset period.

S602, the network equipment receives first indication information from the terminal.

The network device receives the first indication information from the terminal, and can acquire the parameter of the terminal for SL communication, such as at least one of the SL path loss, the DL path loss and the relationship between the SL path loss and the DL path loss. Based on these parameters, the network device can determine whether the terminal will have too low SL transmit power. If it is determined that the terminal may have the SL transmission power too small, the following S603 is performed.

For example, in some embodiments, the network device may determine that the terminal may have an SL transmit power that is too low when the SL path loss is determined to be greater than the first value. The first value is the DL path loss or a value determined from the DL path loss.

In other embodiments, the network device may determine that the terminal may have the SL transmit power too low when it is determined that the SL path loss is always greater than the second value within the preset time. The second value is the DL path loss or a value determined from the DL path loss. Therefore, the network equipment can determine that the SL path loss is larger than the second value as a continuous process, and further avoid the problem of inaccurate judgment caused by parameter abnormality at a certain moment.

For example, a timer may be set in the network device, and the timer starts to count time after the network device receives the first indication information and determines that the SL path loss is greater than the second value. If the network device determines that the SL path loss is always larger than the second value based on one or more received first indication information from the beginning of the timer to the end of the timer, the network device may determine that the SL path loss is larger than the second value as being really and stably present, so that the network device may more accurately determine whether the SL transmission power is too small in the current SL communication.

In the above example, the first value and the second value may be the same or different.

Since the first indication information may include only the SL path loss or the DL path loss, the network device may further obtain the DL path loss or the SL path loss from other information, so that the network device determines whether the terminal may have an excessively low SL transmission power.

For example, if the first indication information includes the SL path loss value, the network device may obtain the DL path loss value from other information, so that the network device can determine whether the terminal may have an SL transmit power too low.

For another example, if the first indication information includes a DL path loss value, the network device may obtain the SL path loss value from other information, so that the network device can determine whether the terminal may have an SL transmit power too low.

For another example, if the first indication information includes a size relationship between the SL path loss and the DL path loss, the network device may determine whether the terminal has an excessively low SL transmit power directly according to the size relationship. Or, the network device may obtain values of DL path loss and SL path loss from other information, determine a magnitude relationship between the SL path loss and the first value or the second value, and compare the magnitude relationship with the magnitude relationship in the first indication information, to finally determine whether the terminal has the situation that the SL transmission power is too small.

S603, the network equipment sends second indication information to the terminal, and the second indication information is used for the terminal to carry out SL communication.

With reference to the description in S602, the network device may determine whether there is a problem that the SL transmission power is too low in the current SL communication based on the first indication information. When the network device determines that the problem of the current SL communication that the SL transmission power is too small exists, the network device may determine whether to take measures to ensure the SL communication.

For example, the network device may determine whether to take corresponding measures to ensure the SL communication (i.e., improve the SL communication quality) according to the service condition (e.g., service priority) of the current SL communication. For example, if the service priority of the current SL communication is low, the network device may determine that no corresponding measures need to be taken to guarantee the SL communication. For another example, if the service priority of the current SL communication is high (if the terminal needs to send important data through the SL communication), the network device may determine to take corresponding measures to ensure that the SL communication is performed. For example, measures to ensure that SL communication is performed normally may include enabling frequency domain and/or time domain coverage enhancement, adjusting power control parameters, and switching communication carriers. For example, in this embodiment of the present application, the network device may send the second indication information including the corresponding measure to the terminal, so that the terminal may perform SL communication according to the second indication information, thereby achieving the purpose of ensuring normal SL communication.

For example, in some embodiments of the present application, the network device may initiate a coverage enhancement technique and send a measure related to the coverage enhancement technique to the terminal through the second indication information.

For example, the coverage enhancement technique may include frequency domain coverage enhancement. The network device may allocate more frequency domain resources to the terminal, and send the frequency domain resources to the terminal by carrying the second indication information, so that the terminal may repeatedly transmit data to be sent on more frequency domain resources allocated by the network device when the maximum transmission power is not reached, thereby implementing coverage enhancement.

As another example, the coverage enhancement techniques can include time-domain coverage enhancement. The network device may allocate more time domain resources to the terminal, and send the time domain resources to the terminal by carrying the second indication information, so that the terminal may repeatedly transmit data to be sent on the more time domain resources allocated by the network device, thereby implementing coverage enhancement.

It should be noted that the frequency domain coverage enhancement and the time domain coverage enhancement in the embodiment of the present application may be repeated transmission on more resources, or may be implemented by using methods such as frequency hopping and beam forming.

As another example, the coverage enhancement technique may include an adjustment to SL transmit power. The network device may adjust the power control parameter (e.g., P in equation (1) and equation (2))₀And/or alpha) and sending the power control parameter to the terminal through the second indication information, so that the terminal can recalculate and obtain the SL transmission power according to the adjusted power control parameter to improve the SL communication quality.

In addition, when the coverage enhancement techniques (such as frequency domain coverage enhancement, time domain coverage enhancement, and adjusting power control parameters) in the above example are used, one of the techniques may be selected to improve the SL communication quality, or any two or more techniques may be selected to improve the SL communication quality, which is not limited herein.

It should be noted that, in some embodiments, the frequency domain resources, the time domain resources, and the power control parameters for coverage enhancement may be allocated by the network device to the terminal after determining to start the coverage enhancement technique, and the second indication information sent to the terminal in the above example may include one or more of the frequency domain resources, the time domain resources, and the power control parameters allocated by the network device to the terminal.

In other embodiments, the frequency domain resources, the time domain resources, and the power control parameters for coverage enhancement may also be pre-configured in the terminal. For example, the second indication information may include information for indicating the terminal to perform coverage enhancement using preset resources (e.g., frequency domain resources, time domain resources, or power control parameters), so that the terminal can perform coverage enhancement according to the second indication information.

In the communication method provided by the embodiment of the present application, the network device may further adopt a carrier switching method to improve SL communication quality. For example, in some embodiments, the network device may send, to the terminal, second indication information including dedicated carrier information, which may include SL dedicated carrier resources allocated by the network for the terminal, or V2X dedicated carrier resources, to instruct the terminal to switch SL communication on the current shared carrier to SL communication on the SL dedicated carrier indicated in the dedicated carrier information or the V2X dedicated carrier. In other embodiments, the SL dedicated carrier or V2X dedicated carrier resources may also be pre-configured in the terminal. The network device may send second indication information including a switching indication to the terminal, so that the terminal switches the current SL communication to the preconfigured SL dedicated carrier or the V2X dedicated carrier for communication according to the switching indication.

In other embodiments, the network device may also determine to disconnect the current SL communication to release the occupied resources if the current transmission resources are tight and the SL communication is not necessary. Then the network device may send second indication information including an indication of the interruption to the terminal in order to instruct the terminal to disconnect the current SL communication.

S604, the terminal receives second indication information from the network equipment, wherein the second indication information is used for the terminal to carry out SL communication.

With reference to the example in S603, the terminal may execute a corresponding scheme according to the second indication information from the network device, and adjust the current SL communication so as to improve the current SL communication quality or disconnect the SL communication.

For example, in some embodiments, the second indication information may include frequency domain resources and/or time domain resources required for SL communication. The terminal may repeatedly transmit the data to be transmitted on the frequency domain resource and/or the time domain resource to ensure that the receiving terminal can accurately receive the data. When the terminal performs the frequency domain coverage enhancement and/or the time domain coverage enhancement, the used SL transmit power may be the same as the previous SL transmit power (e.g., the SL transmit power obtained according to the DL path loss compensation), or may be different. The selection of the specific SL transmission power can be flexibly set according to the actual situation in the implementation process.

In other embodiments, the second indication may include a power control parameter. The terminal may recalculate the SL transmit power for SL communication according to the adjusted power control parameter included in the second indication information. When the terminal reacquires the SL transmit power according to the power control parameter, the DL path loss may be used to compensate the SL transmit power, and the SL path loss may also be used to compensate the SL transmit power.

In other embodiments, the second indication information may include dedicated carrier information, and the terminal may switch the current SL communication to the SL dedicated carrier or the V2X dedicated carrier indicated by the dedicated carrier information for communication. Alternatively, when the SL dedicated carrier or the V2X dedicated carrier has been previously configured in the terminal, the second indication information may include a handover indication, and the terminal may switch the current SL communication to the preconfigured SL dedicated carrier or the V2X dedicated carrier according to the handover indication.

It should be noted that, since the SL communication performed on the SL dedicated carrier or the V2X dedicated carrier does not interfere with the Uu port communication, the terminal may perform the SL communication with a higher transmission power (for example, initiate the SL communication with the SL transmission power obtained according to the SL path loss compensation) while switching the carriers, so as to improve the SL communication quality.

In other embodiments, the second indication information may include an interruption indication, and the terminal may disconnect the current SL communication after receiving the second indication information, so as to release the resource occupied by the current SL communication.

In other embodiments of the present application, after receiving the first indication information of the terminal, the network device may send the second indication information to the terminal when it is determined that the terminal has the problem that the SL transmission power is too small, or may send the second indication information to the terminal after waiting for a certain time. For example, after receiving the first indication information sent by the terminal and determining that the terminal has a problem that the SL transmission power is too low, if the current network resources are tight and no more resources can be provided for coverage enhancement or switching of the V2X dedicated carrier, the network device may send the second indication information to the terminal after waiting for free resources. During the waiting time, the terminal may continue to perform the current SL communication, and after receiving the second indication information, the terminal may perform the SL communication according to the second indication information.

It should be noted that the method in the foregoing example may be applied to a scenario in which the terminal is configured to select the SL path loss or the DL path loss compensation by itself to obtain the SL transmit power, and may also be applied to other scenarios. For example, the terminal is configured to perform SL communication using SL transmit power obtained by DL path loss compensation. In this scenario, if the terminal may send the first indication information to the network device, the network device may determine, based on the first indication information, that the SL path loss is greater than the DL path loss or a value determined according to the DL path loss, and send the second indication information to the terminal, where the second indication information is used to instruct the terminal to reconfigure the above-described policy to the SL transmission power obtained by using the SL path loss compensation for SL communication. For a detailed execution process, please refer to fig. 6, which is not described herein again.

Therefore, the terminal sends the path loss condition in the SL communication process to the network device through the first indication information, and the network device can know the current SL communication state (such as the quality of the SL communication, whether the problem of disconnection exists, and the like). When the network device determines that the current SL communication needs to be ensured based on the first indication information, the network device may send second indication information to the terminal, so as to indicate the terminal to improve the quality of the current SL communication by methods such as coverage enhancement, power control parameter adjustment and/or carrier switching, and ensure the normal operation of the SL communication.

Another embodiment of the present application provides a communication method, where a first layer entity of a terminal may send a relevant parameter of a current SL communication to a second layer entity of the terminal, so that the second layer entity of the terminal determines to adjust the current SL communication, and instructs the first layer entity of the terminal to execute a corresponding SL communication, so as to solve a problem that the SL communication quality may not be ensured when an SL path loss is greater than a DL path loss.

Please refer to fig. 7, which is a flowchart illustrating another communication method according to an embodiment of the present application. As shown in fig. 7, the method may include S701-S702.

S701, a first layer entity of a terminal sends first indication information to a second layer entity of the terminal, wherein the first indication information comprises at least one of the following information: SL path loss, DL path loss, and the relationship between SL path loss and DL path loss.

Similar to the example in S601, in some embodiments, the first layer entity (e.g., AS layer) of the terminal may send the first indication information to the second layer entity (e.g., V2X layer) of the terminal when the preset condition is triggered. For example, the AS layer determines that the SL path loss is greater than a first value, and sends first indication information to the V2X layer, where the first value is a DL path loss or is determined according to the DL path loss; or the AS layer determines that the SL path loss is always greater than a second value in preset time, and sends first indication information to the V2X layer, wherein the second value is the DL path loss or is determined according to the DL path loss; or, when determining that the RLF and the SL path loss are greater than a third value, the AS layer sends the first indication information to the V2X layer, where the third value is a DL path loss or is determined according to the DL path loss.

In other embodiments, the first layer entity (e.g., AS layer) of the terminal may also periodically send the first indication information to the second layer entity (e.g., V2X layer) of the terminal according to a preset period.

S702, the second layer entity of the terminal sends second indication information to the first layer entity of the terminal, and the second indication information is used for the terminal to carry out SL communication.

Similar to the explanation in S602, the second layer entity of the terminal may determine whether there is a problem of the SL transmission power being too low in the current SL communication based on the received first indication information.

For example, in some embodiments, the V2X layer may determine whether the SL path loss is greater than a first value based on the first indication information. The first value may be a value determined from the DL path loss, or may be the DL path loss. If the SL path loss is greater than the first value, then it may be determined that there is a problem with SL transmit power for the current SL communication. In other embodiments, the V2X layer may determine whether the SL path loss is always greater than a second value, which is or is determined from the DL path loss, for a preset time based on the first indication information. If the SL path loss is always larger than the second value within the preset time, the problem that the SL transmitting power is small exists in the current SL communication can be determined.

Optionally, on the basis of the above condition, the V2X layer may determine that the SL transmission power of the current SL communication is obtained by compensating with the DL path loss, so as to determine that the problem of the current SL communication that the SL transmission power is smaller exists.

In this embodiment of the application, since the first indication information may not include the SL path loss and the DL path loss at the same time, the V2X layer may also determine the DL path loss or the SL path loss according to other information, and further determine whether the current SL communication has the problem that the SL transmission power is smaller.

After determining that the current SL communication has the problem of too small SL transmission power, the V2X layer may determine whether corresponding measures need to be taken to ensure the SL communication. For example, the V2X layer may determine whether to take corresponding measures to guarantee the SL communication according to the traffic condition (e.g., traffic priority) of the current SL communication. For example, if the service priority of the current SL communication is high, the network device may determine to take corresponding measures to ensure that the SL communication is performed.

When the V2X layer determines that corresponding measures are to be taken to ensure that the SL communication continues, the corresponding measures may be determined and an indication of the measures may be sent to the AS layer via the second indication information to conduct the SL communication.

For example, in some embodiments, the second indication information may include transmission resources (e.g., frequency domain resources and/or time domain resources that may be used for coverage enhancement) required for SL communication, so that the AS layer can perform frequency domain and/or time domain coverage enhancement on the transmission resources.

In other embodiments, the second indication information may include a power control parameter, so that the AS layer can recalculate the SL transmit power for SL communication according to the power control parameter.

In other embodiments, the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information may indicate the V2X dedicated carrier so that the AS layer can switch SL communication to communication on the V2X dedicated carrier. Alternatively, the second indication information may include a handover indication so that the AS layer can switch SL communication to communication on a preset V2X dedicated carrier.

It should be noted that the coverage enhancement resource, or the SL/V2X dedicated carrier information, or the power control parameter information may be pre-configured in the V2X layer, or may be obtained by the V2X layer from the network in advance.

If the V2X layer determines that corresponding measures are not needed to guarantee the SL communication to continue according to the service condition of the current SL communication, the V2X layer may send second indication information including an interruption indication to the terminal, so that the AS disconnects the current SL communication and releases occupied resources.

For detailed description of the method provided in this embodiment, reference may be made to specific description in relevant steps of fig. 6, which is not described herein again.

It should be noted that, with the method provided in the embodiment of the present application, the terminal may determine, through the V2X layer, whether to take a corresponding measure to improve the quality of the current SL communication, and send the corresponding measure to the AS layer for execution. The resources (e.g., frequency domain resources and time domain resources for coverage enhancement, power control parameters for adjusting SL transmit power, and V2X dedicated carrier resources) used by these measures may be preset in the V2X layer, and when the V2X layer determines that it is necessary to perform the performance of the SL communication, these preset measures may be sent to the AS layer.

In this way, the AS layer of the terminal sends the parameters of the current SL communication (such AS one or more of the SL path loss, the DL path loss, and the relationship between the SL path loss and the DL path loss) to the V2X layer, so that the V2X layer can instruct the AS layer to perform corresponding measures through the second indication information to ensure the communication quality of the current SL communication, and the problem that the SL communication quality cannot be ensured when the SL path loss is greater than the DL path loss is solved. It can be seen that, with the method provided in the embodiment of the present application, the SL communication quality can be ensured by the interaction between the V2X layer and the AS layer, and the terminal does not need to interact with the network device, so that the embodiment may be applied in a scenario where the terminal cannot interact with the network device.

The above-mentioned scheme provided by the embodiment of the present application is introduced mainly from the perspective of interaction between network elements. It is to be understood that the terminal and the network device include corresponding hardware structures and/or software modules for performing the respective functions in order to realize the functions. Those skilled in the art will readily appreciate that the elements of the various examples described in connection with the embodiments disclosed herein may be implemented as hardware or a combination of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware 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.

In the embodiment of the present application, the terminal and the network device may be divided into the functional modules according to the above method examples, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. Optionally, the division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

Fig. 8 shows a schematic block diagram of a communication device 800, where the communication device 800 may be a terminal or a chip or a system on a chip in the terminal, and the communication device 800 may be configured to perform the functions of the terminal in the above embodiments. As one implementation manner, the communication apparatus 800 shown in fig. 8 includes: a sending module 801 and a receiving module 802.

The sending module 801 may be configured to send data or information to other devices besides the terminal, for example, the sending module 801 may be configured to send the first indication information to the network device. Illustratively, the sending module 801 may be configured to execute S601 shown in fig. 6.

The receiving module 802 may be configured to receive data or information sent by a device other than the terminal, for example, the receiving module 802 may be configured to receive second indication information from a network device. Illustratively, the receiving module 802 may be configured to perform S604 shown in fig. 6.

In one possible design, the sending module 801 is specifically configured to send, to the network device, first indication information when it is determined that the SL path loss is greater than a first value, where the first value is a DL path loss or is determined according to the DL path loss; or, the sending module 801 is specifically configured to send the first indication information to the network device when it is determined that the SL path loss is always greater than a second value within the preset time, where the second value is the DL path loss or is determined according to the DL path loss; or, the sending module 801 is specifically configured to send the first indication information to the network device when it is determined that the RLF and the SL path loss are greater than a third value, where the third value is a DL path loss or is determined according to the DL path loss.

In one possible design, the sending module 801 is specifically configured to periodically send the first indication information to the network device.

In one possible design, the second indication information includes transmission resources required for SL communication, and the transmission resources include frequency domain resources and/or time domain resources.

In one possible design, the second indication information includes a power control parameter, so that the communication apparatus 800 performs SL communication with SL transmission power determined according to the power control parameter.

In one possible design, the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information indicates the SL dedicated carrier. So that the communication apparatus 800 performs SL communication on the SL dedicated carrier according to the dedicated carrier information. Alternatively, the second indication information includes a handover indication so that the communication apparatus 800 switches carriers according to the handover indication.

It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again. The communication device provided by the embodiment of the application is used for executing the functions of the terminal in the communication method, so that the same effects as those of the communication method can be achieved. Alternatively, but not necessarily, it is understood that the communication apparatus provided in the embodiment of the present application may include a processing module or a control module for supporting the above-mentioned sending module 801 and/or receiving module 802 to complete corresponding functions, if necessary.

Fig. 9 shows a schematic block diagram of a communication apparatus 900, where the communication apparatus 900 may be a chip or a system on a chip in a network device, and the communication apparatus 900 may be configured to perform the functions of the network device in the foregoing embodiments, and as an implementation manner, the communication apparatus 900 shown in fig. 9 includes: a receiving module 901 and a sending module 902.

A receiving module 901, configured to receive first indication information from a terminal, where the first indication information includes at least one of the following: SL path loss, DL path loss, and the relationship between SL path loss and DL path loss. Illustratively, the receiving module 901 may be configured to execute S602 shown in fig. 6.

The sending module 902 may be configured to send second indication information to the terminal, where the second indication information is used to indicate the terminal to perform SL communication. Illustratively, the sending module 902 may be configured to execute S603 shown in fig. 6.

In one possible design, the sending module 902 is specifically configured to send the second indication information to the terminal when it is determined that the SL path loss is greater than a first value, where the first value is a DL path loss or is determined according to a DL path loss. Or, the sending module 902 is specifically configured to send the second indication information to the terminal when it is determined that the SL path loss is always greater than a second value within the preset time, where the second value is the DL path loss or is determined according to the DL path loss.

In one possible design, the second indication information may include transmission resources required for SL communication, and the transmission resources may include frequency domain resources and/or time domain resources.

In one possible design, the second indication information includes a power control parameter.

In one possible design, the second indication information includes dedicated carrier information indicating the SL dedicated carrier. Or, the second indication information includes a handover indication, and the handover indication is used for indicating the terminal to switch the carrier.

It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again. The communication device provided by the embodiment of the application is used for executing the function of the network equipment in the communication method, so that the same effect as the communication method can be achieved. Alternatively, but not necessarily, it is understood that the communication apparatus provided in the embodiment of the present application may include a processing module or a control module for supporting the above-mentioned sending module 902 and/or receiving module 901 to complete corresponding functions, if necessary.

Fig. 10 is a schematic block diagram of another communication apparatus 1000, where the communication apparatus 1000 may be a chip in a terminal or a system on a chip, and the communication apparatus 1000 may be configured to perform the functions of the network device in the foregoing embodiments, and as an implementation manner, the communication apparatus 1000 shown in fig. 10 includes: a first processing module 1001 and a second processing module 1002.

Illustratively, the first processing module 1001 has the functions of the first layer entity (e.g. AS layer) in the terminal, and the second processing module 1002 has the functions of the second layer entity (e.g. PC5-S layer, V2X layer and application layer) in the terminal, such AS: the first process module 1001 may include an AS layer in the terminal AS shown in fig. 5, and the second process module 1002 may include a PC5-S layer, a V2X layer, and an application layer in the terminal AS shown in fig. 5.

The first processing module 1001 may be configured to send first indication information to the second processing module 1002, where the first indication information includes at least one of the following: SL path loss, DL path loss, and the relationship between SL path loss and DL path loss. Illustratively, the first processing module 1001 may be configured to execute S701 shown in fig. 7.

The second processing module 1002 may be configured to send second indication information to the first processing module 1001, where the second indication information is used for SL communication by the terminal. Illustratively, the second processing module 1002 may be configured to perform S702 as shown in fig. 7.

In one possible design, the first processing module 1001 is specifically configured to send the first indication information to the second processing module 1002 when it is determined that the SL path loss is greater than a first value, where the first value is the DL path loss or is determined according to the DL path loss. Or, the first processing module 1001 is specifically configured to send the first indication information to the second processing module 1002 when it is determined that the SL path loss is always greater than a second value within the preset time, where the second value is the DL path loss or is determined according to the DL path loss. Or, the first processing module 1001 is specifically configured to send the first indication information to the second processing module 1002 when it is determined that the RLF and the SL path loss are greater than a third value, where the third value is a DL path loss or is determined according to the DL path loss.

In one possible design, the first processing module 1001 is specifically configured to periodically send the first indication information to the second processing module 1002.

In one possible design, the second processing module 1002 is specifically configured to send second indication information to the second processing module 1002 when it is determined that the SL path loss is greater than a first value, where the first value is the DL path loss or is determined according to the DL path loss. Or, the second processing module 1002 is specifically configured to send second indication information to the second processing module 1002 when it is determined that the SL path loss is always greater than a second value within the preset time, where the second value is the DL path loss or is determined according to the DL path loss.

In one possible design, the second indication information includes a power control parameter, and the first processing module 1001 is further configured to perform SL communication using SL transmission power determined according to the power control parameter.

In one possible design, the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information indicates the SL dedicated carrier. The first processing module 1001 is further configured to perform SL communication on the SL dedicated carrier according to the dedicated carrier information. Or, the second indication information includes a handover indication, and the handover indication is used for indicating the terminal to switch the carrier. The first processing module 1001 is further configured to switch carriers according to the handover indication.

It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again. The communication device provided by the embodiment of the application is used for executing the functions of the terminal in the communication method, so that the same effects as those of the communication method can be achieved. Alternatively, but not necessarily, it is understood that, in the embodiment of the present application, the functions of the first processing module 1001 and the second processing module 1002 may be implemented by separate hardware modules, or by separate software modules, or by a way of executing program instructions by a common hardware processing platform.

Fig. 11 shows a schematic block diagram of another communication device 1100. The communication device 1100 may include: a processor 1101 and a memory 1102. The memory 1102 is used to store computer-executable instructions. For example, in some embodiments, the processor 1101, when executing the instructions stored in the memory 1102, may cause the communication apparatus 1100 to perform S601 and/or S604 shown in fig. 6, as well as other operations that the terminal needs to perform. In other embodiments, the processor 1101, when executing the instructions stored in the memory 1102, may cause the communication apparatus 1100 to perform S701 and/or S702 shown in fig. 7, as well as other operations that the terminal needs to perform.

Fig. 12 shows a schematic diagram of a chip system 1200. The chip system 1200 may include: a processor 1201 and a communication interface 1202 for enabling the terminal to implement the functions referred to in the above embodiments. For example, in some embodiments, the processor 1201 may communicate with devices other than the terminal (e.g., network devices) through the communication interface 1202. For example, the processor 1201 transmits the first indication information to other devices (such as a network device) than the terminal through the communication interface 1202. For another example, the processor 1201 receives second indication information sent by a device (e.g., a network device) other than the terminal through the communication interface 1202. In other embodiments, processor 1201 may enable communication between different protocol layers within the terminal through communication interface 1202. In one possible design, the system-on-chip further includes a memory for storing necessary program instructions and data for the terminal. The chip system may be constituted by a chip, or may include a chip and other discrete devices.

Fig. 13 shows a schematic block diagram of another communication apparatus 1300. The communication device 1300 may include: a processor 1301 and a memory 1302. The memory 1302 is used to store computer-executable instructions. For example, when the processor 1301 executes the computer-executable instructions stored in the memory 1302, the communication apparatus 1300 may be caused to perform S602 and/or S603 shown in fig. 6, and other operations that a network device needs to perform.

Fig. 14 shows a schematic diagram of a chip system 1400. The chip system 1400 may include: a processor 1401 and a communication interface 1402 to enable the network device to implement the functions involved in the above embodiments. Illustratively, the processor 1401 may communicate with other devices (e.g. terminals) than network devices via the communication interface 1402. For example, the processor 1401 transmits second indication information to other devices (such as a terminal) than the network device through the communication interface 1402. For another example, the processor 1401 may receive the first indication information transmitted from a device other than the network device (e.g., a terminal) through the communication interface 1402. In one possible design, the system-on-chip further includes a memory for storing necessary program instructions and data for the terminal. The chip system may be constituted by a chip, or may include a chip and other discrete devices.

Embodiments of the present application also provide a communication system, which may include one or more terminals and/or one or more network devices. Illustratively, one or more terminals may be configured to perform S601 and/or S604 as shown in fig. 6, or configured to perform S701 and/or S702 as shown in fig. 7, as well as other operations to be performed by the terminal. One or more network devices may be used to perform S602 and/or S603 as shown in fig. 6, as well as other operations that the network devices are to perform in V2X communications.

It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again. The communication device provided by the embodiment of the application is used for executing the functions of the terminal in the communication method, so that the same effects as those of the communication method can be achieved.

The functions or actions or operations or steps, etc., in the above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, 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. The procedures or functions described in accordance with the embodiments of the present application are all or partially generated upon loading and execution of computer program instructions on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include such modifications and variations.

Claims

1. A method of communication, the method comprising:

the terminal sends first indication information to the network equipment, wherein the first indication information comprises at least one of the following information: side link SL path loss, downlink DL path loss, and the relationship between SL path loss and DL path loss;

and the terminal receives second indication information from the network equipment, wherein the second indication information is used for indicating the terminal to carry out SL communication.

2. The method of claim 1, wherein the terminal sends first indication information to a network device, and wherein the first indication information comprises:

when determining that the SL path loss is greater than a first value, the terminal sends the first indication information to the network device, where the first value is the DL path loss or is determined according to the DL path loss; or the like, or, alternatively,

the terminal sends the first indication information to the network equipment when determining that the SL path loss is always greater than a second value within preset time, wherein the second value is the DL path loss or is determined according to the DL path loss; or the like, or, alternatively,

and when determining that the Radio Link Fails (RLF) and the SL path loss is greater than a third value, the terminal sends the first indication information to the network equipment, wherein the third value is the DL path loss or is determined according to the DL path loss.

3. The method of claim 1, wherein the terminal sends first indication information to a network device, and wherein the first indication information comprises:

the terminal periodically sends the first indication information to the network equipment.

4. The method according to any of claims 1-3, wherein the second indication information comprises transmission resources required for SL communication, and the transmission resources comprise frequency domain resources and/or time domain resources.

5. The method according to any of claims 1-3, wherein the second indication information comprises a power control parameter, the method further comprising:

and the terminal adopts the SL transmitting power determined according to the power control parameter to carry out SL communication.

6. The method according to any one of claims 1 to 3,

the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information is used for indicating an SL dedicated carrier; the method further comprises the following steps: the terminal carries out SL communication on the SL dedicated carrier according to the dedicated carrier information;

or the like, or, alternatively,

the second indication information comprises a handover indication; the method further comprises the following steps: and the terminal switches the carrier wave according to the switching indication.

7. A method of communication, the method comprising:

the network equipment receives first indication information from a terminal, wherein the first indication information comprises at least one of the following information: side link SL path loss, downlink DL path loss, and the relationship between SL path loss and DL path loss;

and the network equipment sends second indication information to the terminal, wherein the second indication information is used for indicating the terminal to carry out SL communication.

8. The method of claim 7, wherein the network device sends second indication information to the terminal, and wherein the second indication information comprises:

when determining that the SL path loss is greater than a first value, the network device sends the second indication information to the terminal, where the first value is the DL path loss or is determined according to the DL path loss; or the like, or, alternatively,

and the network equipment sends the second indication information to the terminal when determining that the SL path loss is always greater than a second value in preset time, wherein the second value is the DL path loss or is determined according to the DL path loss.

9. The method according to claim 7 or 8, wherein the second indication information comprises transmission resources required for SL communication, and the transmission resources comprise frequency domain resources and/or time domain resources.

10. The method according to claim 7 or 8, wherein the second indication information comprises power control parameters.

11. The method according to claim 7 or 8, wherein the second indication information comprises dedicated carrier information indicating a SL dedicated carrier; or the like, or, alternatively,

the second indication information comprises a switching indication, and the switching indication is used for indicating the terminal to switch the carrier.

12. A method of communication, the method comprising:

a first layer entity of a terminal sends first indication information to a second layer entity of the terminal, wherein the first indication information comprises at least one of the following information: side link SL path loss, downlink DL path loss, and the relationship between SL path loss and DL path loss;

and the second layer entity of the terminal sends second indication information to the first layer entity of the terminal, wherein the second indication information is used for indicating the terminal to carry out SL communication.

13. The method of claim 12, wherein the sending, by the first layer entity of the terminal, the first indication information to the second layer entity of the terminal comprises:

when determining that the SL path loss is greater than a first value, a first layer entity of the terminal sends the first indication information to a second layer entity of the terminal, where the first value is the DL path loss or is determined according to the DL path loss; or the like, or, alternatively,

when determining that the SL path loss is always greater than a second value within a preset time, a first layer entity of the terminal sends the first indication information to a second layer entity of the terminal, where the second value is the DL path loss or is determined according to the DL path loss; or the like, or, alternatively,

and when determining that a Radio Link Fails (RLF) and the SL path loss is greater than a third value, the first layer entity of the terminal sends the first indication information to the second layer entity of the terminal, wherein the third value is the DL path loss or is determined according to the DL path loss.

14. The method of claim 12, wherein the sending, by the first layer entity of the terminal, the first indication information to the second layer entity of the terminal comprises:

and the first layer entity of the terminal periodically sends the first indication information to the second layer entity of the terminal.

15. The method according to any of claims 12-14, wherein the sending of the second layer entity of the terminal to the first layer entity of the terminal by the second layer entity of the terminal comprises:

when determining that the SL path loss is greater than a first value, a second layer entity of the terminal sends the second indication information to a first layer entity of the terminal, where the first value is the DL path loss or is determined according to the DL path loss; or the like, or, alternatively,

and when the second layer entity of the terminal determines that the SL path loss is always greater than a second value in preset time, sending the second indication information to the first layer entity of the terminal, wherein the second value is the DL path loss or is determined according to the DL path loss.

16. The method according to any of claims 12-15, wherein the second indication information comprises transmission resources required for SL communication, and wherein the transmission resources comprise frequency domain resources and/or time domain resources.

17. The method according to any of claims 12-15, wherein the second indication information comprises a power control parameter, the method further comprising:

and the first layer entity of the terminal adopts the SL transmitting power determined according to the power control parameter to carry out SL communication.

18. The method according to any one of claims 12 to 15,

the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information is used for indicating an SL dedicated carrier; the method further comprises the following steps: a first layer entity of the terminal carries out SL communication on the SL dedicated carrier according to the dedicated carrier information;

or the like, or, alternatively,

the second indication information comprises a switching indication, and the switching indication is used for indicating the terminal to switch the carrier; the method further comprises the following steps: and the first layer entity of the terminal switches the carrier wave according to the switching indication.

19. The method according to any one of claims 12 to 18,

a first layer entity of the terminal is an access AS layer;

the second layer entity of the terminal is a V2X layer.

20. A communication apparatus, characterized in that the communication apparatus is configured to implement the communication method according to any one of claims 1-6 or claims 12-19.

21. A communications device, characterized in that the communications device comprises one or more processors and one or more memories; the one or more memories coupled with the one or more processors, the one or more memories storing computer instructions;

the computer instructions, when executed by the one or more processors, cause the communication device to perform the communication method of any of claims 1-6, or claims 12-19.

22. A computer storage medium comprising computer instructions which, when executed, perform a communication method as recited in any of claims 1-6, or claims 12-19.

23. A communication apparatus, characterized in that the communication apparatus is configured to implement the communication method according to any one of claims 7-11.

24. A communications device, characterized in that the communications device comprises one or more processors and one or more memories; the one or more memories coupled with the one or more processors, the one or more memories storing computer instructions;

the computer instructions, when executed by the one or more processors, cause the communication device to perform the communication method of any of claims 7-11.

25. A computer storage medium comprising computer instructions which, when executed, perform the communication method of any one of claims 7-11.