CN111741519B

CN111741519B - Side link transmission power calculation method and communication device

Info

Publication number: CN111741519B
Application number: CN201910227495.4A
Authority: CN
Inventors: 张向东; 常俊仁; 刘哲
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-03-25
Filing date: 2019-03-25
Publication date: 2023-04-11
Anticipated expiration: 2039-03-25
Also published as: CN111741519A; WO2020192344A1

Abstract

The application discloses a side link transmitting power calculation method and a communication device. The method comprises the following steps: acquiring first indication information, wherein the first indication information is used for indicating parameters used for calculating the side link transmitting power; acquiring parameters used for calculating the side link transmitting power according to the first indication information; and calculating the transmitting power of the side link according to the acquired parameters used for calculating the transmitting power of the side link. A corresponding apparatus is also disclosed. By adopting the scheme of the application, the parameters used for calculating the transmitting power of the side link can be accurately and flexibly determined according to the indication information, and the communication quality is improved.

Description

Side link transmission power calculation method and communication device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method for calculating side link transmit power and a communications apparatus.

Background

Currently, a New Radio (NR) terminal in a vehicle networking (V2X) may operate in-coverage (IC) or out-coverage (out-coverage). The terminal devices operating in the coverage area may also have different resource allocation manners in the sidelink (sidelink), and may be in mode1 (mode 1): the resource dynamically allocated by the network side device may also be mode2 (mode 2): and sensing available resources based on a resource pool (resource pool) configured or pre-configured by the network side equipment. Here, sidelink refers to direct (D2D) communication or a direct link between two devices in a V2X scenario. The in-coverage or out-of-coverage refers to the in-coverage or out-of-coverage of the mobile communication network. Of course, other networks, such as a wlan network, may be in or out of the coverage area, and the invention is not limited thereto.

When a V2X terminal performs sidelink communication, as shown in fig. 1, in a sidelink communication diagram between UE1 and UE2, the communication supports open-loop power control (power control not based on feedback), and the open-loop power control may be based on a path loss (path loss) from the terminal device to a network side device, or may be based on a path loss from the terminal device to a device at the opposite end of communication. As shown in fig. 1, it is assumed that the sending terminal is a User Equipment (UE) 1 and the receiving terminal is a UE2, and when the UE1 calculates the transmission power of data to be transmitted to the UE2, the path loss used by the UE1 may be the path loss1 from the UE1 to a network side device, or may be the path loss2 from the UE1 to a communication peer device (i.e., the UE 2). The path loss used may be a compensation for the path loss that needs to be considered when calculating the transmit power.

Then, when the terminal device calculates the transmission power, it is a problem to be solved whether the terminal device uses the path loss from the terminal device to the network side device or the path loss from the terminal device to the communication peer device.

In Long Term Evolution (LTE) V2X, only broadcast is available, and there is no specific communication object, so there is no concept of path loss from the terminal device to the communication peer device, and the transmit power calculation is determined based on the path loss from the terminal device to the network side device.

Disclosure of Invention

The application provides a side link transmission power calculation method and a communication device, which are used for accurately and flexibly determining parameters used for calculating side link transmission power.

In a first aspect, a method for calculating edge link transmit power is provided, including: acquiring first indication information, wherein the first indication information is used for indicating parameters used for calculating the side link transmitting power; acquiring parameters used for calculating the side link transmitting power according to the first indication information; and calculating the transmitting power of the side link according to the acquired parameters used for calculating the transmitting power of the side link.

In the aspect, according to the indication information, the parameters used for calculating the side link transmitting power can be accurately and flexibly determined, and the communication quality is improved.

In one implementation, the parameters used to calculate the sidelink transmit power include one or more of the following information: the method comprises the steps that first path loss is the path loss between terminal equipment and network side equipment; a second path loss, which is a path loss between the terminal device and the communication opposite terminal device; and the maximum transmitting power is the maximum transmitting power which can be supported by the terminal equipment.

In this implementation, the first indication information may directly indicate a parameter used for calculating the side link transmission power, such as directly indicating to use the first path loss, or directly indicating to use the second path loss, or directly indicating to use the maximum transmission power.

In this implementation, the terminal device may select, according to the indication information, to calculate the transmit power of the side link based on the first path loss or the second path loss, or may directly transmit with the maximum transmit power.

In another implementation, the terminal device transitions from a first state to a second state, the first state uses a first parameter, the second state uses a second parameter, and the first indication information is time T; the obtaining the parameter used for calculating the side link transmitting power according to the first indication information includes: continuously using the first parameter within the time T range after the terminal equipment is changed from the first state to the second state; wherein the first state comprises one or more of: coverage status, transmission type, link type. For example, the terminal device is changed from the first state to the second state, which means that the coverage state is changed, for example, the first state is in the coverage range, the second state is out of the coverage range, and the first state is changed to the second state, which means that the terminal device moves from the coverage range to the outside of the coverage range, or the first state is out of the coverage range, the second state is in the coverage range, and the first state is changed to the second state, which means that the terminal device moves from the outside of the coverage range to the inside of the coverage range; further, for example, the terminal device changes from the first state to the second state, which indicates that the transmission type is changed, for example, the first state is that the terminal device performs unicast communication, the second state is that the terminal device performs broadcast communication, the first state changes to the second state indicates that the terminal device changes from performing unicast communication to performing broadcast communication, or the first state indicates that the terminal device performs broadcast communication, the second state indicates that the terminal device performs unicast communication, and the first state changes to the second state indicates that the terminal device changes from performing broadcast communication to performing unicast communication. The change in the transmission type here may also include a change from unicast to multicast, or a change from multicast to unicast, or a change from multicast to broadcast, or a change from broadcast to multicast; for example, the transition of the terminal device from the first state to the second state is that the link type is changed, for example, the first state is that the terminal device performs UL communication (mobile communication network uplink communication), the second state is that the terminal device performs SL communication (sidelink communication), the transition of the first state to the second state is that the terminal device transitions from performing UL communication to performing SL communication, or the first state is that the terminal device performs SL broadcast communication, the second state is that the terminal device performs UL communication, and the transition of the first state to the second state is that the terminal device transitions from performing SL communication to performing UL communication. Here, the link type change may also include a change from LTE V2X SL to NR V2X SL, or a change from NR V2X SL to LTE V2X SL, or the like.

In a time T range after the terminal device is converted from the first state to the second state, continuing to use the first parameter, specifically, for example, when the first state is converted to the second state, or after the first state is converted to the second state, starting a timer T, and before the timer T is overtime, calculating the first parameter used by the transmission power when the first state is continuously used to calculate the transmission power; the transmit power is calculated using the second parameter of the second state to calculate the transmit power when, or after, the timer T expires.

It should be noted that the first parameter used in the first state and the second parameter used in the second state may be the same or different, and the present invention is not limited and does not affect the implementation of the scheme of the present invention.

In the implementation, for the situation that the state of the terminal device changes temporarily or in a short time, if the state changes, the new path loss is immediately adopted to calculate the transmitting power of the side link, and the adjustment of the transmitting power has a certain influence on both the radio frequency and the baseband, because the baseband needs to configure corresponding parameters to the radio frequency for each power adjustment. After obtaining the parameters provided by the lace, the adjustment of the radio frequency requires a certain time. During the adjustment time of the radio frequency, the parameters, such as MCS, used for data transmission of the terminal device are not well determined, for example, the terminal device may select a more conservative MCS to ensure the communication quality, which may also have a certain influence on the communication rate. In the implementation, a time T is defined for delaying the change of the calculation mode of the transmission power, so that frequent changes of the transmission power caused by the change of the state of the terminal equipment can be avoided, and the influence of frequent changes of the power on the radio frequency and the baseband of the terminal equipment is reduced.

In yet another implementation, the first indication information is network configured, or pre-configured.

In still another implementation, the first indication information includes characteristic information, and the characteristic information has a corresponding relationship with a parameter used for calculating the side link transmission power, where the characteristic information includes one or more of the following information: a path loss threshold, a path loss selection priority, a service type, a bearer type, a session type and logic channel information; the obtaining the parameter used for calculating the side link transmission power according to the first indication information includes: and acquiring the parameters used for calculating the side link transmitting power according to the corresponding relation between the characteristic information and the parameters used for calculating the side link transmitting power.

In this implementation, the first indication information may include, in addition to the characteristic information, a correspondence between the characteristic information and a parameter used for calculating the side link transmission power.

In this implementation, the correspondence between the above information and the parameter may be preset, or the above information and/or the correspondence between the above information and the parameter may be received from the network side device, and the parameter may be determined according to the above information and the correspondence between the above information and the parameter, so as to accurately and flexibly calculate the transmit power of the side link based on the parameter.

In this implementation, the first indication information may directly indicate the characteristic information and parameters used for calculating the side link transmission power. For example, directly instruct service type 1 to use the first path loss, or directly instruct service type 2 to use the second path loss, or directly instruct service type 3 to use the maximum transmission power; for another example, logical channel 1 is directly instructed to use the first path loss, or logical channel 2 uses the second path loss, or logical channel 3 uses the maximum transmit power. Other characteristic information is similar to the description, and the invention is not repeated.

In a second aspect, a method for calculating edge link transmit power is provided, including: generating first indication information, wherein the first indication information is used for indicating a parameter used for calculating the side link transmitting power; and sending the first indication information to the terminal equipment.

In one implementation, the parameters used to calculate the sidelink transmit power include one or more of the following information:

the method comprises the steps that first path loss is the path loss between terminal equipment and network side equipment;

a second path loss, which is a path loss between the terminal device and the communication opposite terminal device;

and the maximum transmitting power is the maximum transmitting power which can be supported by the terminal equipment.

In another implementation, the first indication information includes: the characteristic information has a corresponding relation with the parameters used for calculating the side link transmitting power, wherein the characteristic information comprises one or more of the following information: path loss threshold, path loss selection priority, service type, bearer type, session type, and logical channel information.

In a third aspect, a communication apparatus is provided, including: an obtaining unit, configured to obtain first indication information, where the first indication information is used to indicate a parameter used for calculating side link transmission power; the obtaining unit is further configured to obtain a parameter used for calculating the side link transmission power according to the first indication information; and the calculation unit is used for calculating the transmitting power of the side link according to the acquired parameters used for calculating the transmitting power of the side link.

In another implementation, the terminal device transitions from a first state to a second state, the first state uses a first parameter, the second state uses a second parameter, and the first indication information is time T; the acquiring unit is used for continuing to use the first parameter within a time T range after the terminal equipment is changed from the first state to the second state; wherein the first state comprises one or more of: a change in coverage status, a change in transmission type, a change in link type.

In yet another implementation, the first indication is network configured, or pre-configured.

In yet another implementation, the first indication information includes characteristic information, and the characteristic information has a corresponding relationship with a parameter used for calculating the side link transmission power, where the characteristic information includes one or more of the following information: a path loss threshold, a path loss selection priority, a service type, a bearer type, a session type and logical channel information; and the obtaining unit is used for obtaining the parameters used for calculating the side link transmitting power according to the corresponding relation between the characteristic information and the parameters used for calculating the side link transmitting power.

In this implementation, the first indication information may directly indicate the characteristic information and parameters used for calculating the side link transmission power. For example, directly instruct service type 1 to use the first path loss, or directly instruct service type 2 to use the second path loss, or directly instruct service type 3 to use the maximum transmission power; as another example, logical channel 1 is directly instructed to use the first path loss, or logical channel 2 uses the second path loss, or logical channel 3 uses the maximum transmit power. Other characteristic information is similar to the description, and the invention is not repeated.

In a fourth aspect, a communication apparatus is provided, including: the device comprises a processing unit, a first sending unit and a second sending unit, wherein the processing unit is used for generating first indication information which is used for indicating a parameter used for calculating the side link transmitting power; and the sending unit is used for sending the first indication information to the terminal equipment.

In this implementation, the first indication information may directly indicate the characteristic information and the parameters used for calculating the side link transmission power. For example, directly instruct service type 1 to use the first path loss, or directly instruct service type 2 to use the second path loss, or directly instruct service type 3 to use the maximum transmission power; for another example, logical channel 1 is directly instructed to use the first path loss, or logical channel 2 uses the second path loss, or logical channel 3 uses the maximum transmit power. Other characteristic information is similar to the description, and the description is omitted.

In a fifth aspect, a communication apparatus is provided, including: the system comprises a processor and a transceiver, wherein the processor is coupled with the transceiver and is used for executing computer programs or instructions to control the transceiver to receive and transmit information; when the computer program or instructions are executed by the processor, the processor is further configured to perform the steps of: acquiring first indication information, wherein the first indication information is used for indicating parameters used for calculating the side link transmitting power; acquiring parameters used for calculating the side link transmitting power according to the first indication information; and calculating the transmitting power of the side link according to the acquired parameters used for calculating the transmitting power of the side link.

In another implementation, the terminal device transitions from a first state to a second state, the first state uses a first parameter, the second state uses a second parameter, and the first indication information is time T; the processor executes the step of obtaining the parameter used for calculating the side link transmitting power according to the first indication information, and the step includes: continuously using the first parameter within the time T range after the terminal equipment is changed from the first state to the second state; wherein the first state comprises one or more of: coverage status, transmission type, link type.

In still another implementation, the first indication information includes characteristic information, and the characteristic information has a corresponding relationship with a parameter used for calculating the side link transmission power, where the characteristic information includes one or more of the following information: a path loss threshold, a path loss selection priority, a service type, a bearer type, a session type and logical channel information; the processor executes the step of obtaining the parameter used for calculating the side link transmitting power according to the first indication information, and the step includes: and acquiring the parameters used for calculating the side link transmitting power according to the corresponding relation between the characteristic information and the parameters used for calculating the side link transmitting power.

In a sixth aspect, a communication apparatus is provided, including: the system comprises a processor and a transceiver, wherein the processor is coupled with the transceiver and is used for executing computer programs or instructions to control the transceiver to receive and transmit information; when the computer program or instructions are executed by the processor, the processor is further configured to perform the steps of: generating first indication information, wherein the first indication information is used for indicating parameters used for calculating side link transmission power, and sending the first indication information to terminal equipment.

In one implementation, the parameters used for calculating the side link transmission power include one or more of the following information:

In this implementation, the first indication information may directly indicate the characteristic information and parameters used for calculating the side link transmission power. For example, directly indicating that the traffic type 1 uses the first path loss, or directly indicating that the traffic type 2 uses the second path loss, or directly indicating that the traffic type 3 uses the maximum transmission power; as another example, logical channel 1 is directly instructed to use the first path loss, or logical channel 2 uses the second path loss, or logical channel 3 uses the maximum transmit power. Other characteristic information is similar to the description, and the invention is not repeated.

In a seventh aspect, a computer-readable storage medium is provided, which has instructions stored therein, and when the instructions are executed on a computer, the instructions cause the computer to execute the above aspects or any method for realizing the above method.

In an eighth aspect, there is provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the above aspects or any of the implementations of the method.

Drawings

The drawings that are required to be used in this application, either in the examples or in the background, are described below.

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

fig. 2 is a schematic flowchart of a method for calculating side link transmission power according to an embodiment of the present disclosure;

fig. 3 is a schematic flowchart of another method for calculating edge link transmit power according to an embodiment of the present disclosure;

fig. 4 is a schematic flowchart of another method for calculating edge link transmit power according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a network-side device according to an embodiment of the present application;

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

fig. 8 is a schematic structural diagram of another network-side device according to an embodiment of the present application.

Detailed Description

The embodiments of the present application will be described below with reference to the drawings.

The architecture of the communication system to which the present application relates may be as shown in fig. 1. The communication system may include at least one network-side device (only 1 shown) and one or more terminal devices (two V2X terminal devices: UE1 and UE2 are illustrated in the figure) connected to the network-side device. UE1 and UE2 may perform mobile network communication with a network side device, and UE1 and UE2 may also perform sidelink communication.

The network side device may be a device capable of communicating with a terminal device. The network side device may be any device having a wireless transceiving function. Including but not limited to: a base station (nodeB), an evolved node b (eNodeB), a base station (gNB) in a fifth generation (5G) communication system, a base station or a network side device in a future communication system, an access node, a wireless relay node, a wireless backhaul node, and the like in a WiFi system. The network side device may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario. The network side device may also be a small station, a Transmission Reference Point (TRP), or the like. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the network side device.

The terminal equipment has a wireless transceiving function, can be deployed on land and comprises an indoor or outdoor terminal, a handheld terminal, a wearable terminal or a vehicle-mounted terminal; can also be deployed on the water surface, such as a ship and the like; and may also be deployed in the air, such as airplanes, balloons, satellites, and the like. The terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self-driving (self-driving), a wireless terminal in telemedicine (remote medical), 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. The embodiments of the present application do not limit the application scenarios. A terminal device may also sometimes be referred to as a User Equipment (UE), an access terminal device, a UE unit, a mobile station, a remote terminal device, a mobile device, a terminal (terminal), a wireless communication device, a UE agent, or a UE apparatus, etc.

The scheme of the present application may be applied to an evolved UMTS terrestrial radio access network (E-UTRAN), a next generation radio access network (NG-RAN) system, and a next generation mobile communication system, which is not limited in this respect.

It should be noted that the terms "system" and "network" in the embodiments of the present application may be used interchangeably. The "plurality" means two or more, and in view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present application. "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.

Please refer to fig. 2, which is a schematic flowchart of a method for calculating side link transmit power according to an embodiment of the present application, wherein:

s201, the network side equipment generates first indication information.

The first indication information is used for indicating a parameter used for calculating the side link transmission power.

The parameters used to calculate the side link transmit power include one or more of the following information:

That is, the terminal device may calculate the transmission power based on the first path loss or the second path loss (the path loss may be compensated for when calculating the transmission power based on the path loss or by using the path loss), or may directly transmit data with the maximum transmission power as the transmission power, and the calculation method is flexible. However, if the used parameters are not appropriate, the calculated transmission power may be too large or too small, and if the calculated transmission power is too large, interference to the network side device or the communication peer device may be caused; if the transmission power is too small, the communication quality cannot be guaranteed. Therefore, appropriate parameters need to be selected.

S202, the network side equipment sends first indication information to the terminal equipment.

Correspondingly, the terminal equipment acquires the first indication information.

In this embodiment, the terminal device needs to explicitly obtain the parameters used for calculating the side link transmission power. First, the terminal device acquires first indication information. In this embodiment, the terminal device may receive the first indication information from the network side device, that is, the network side device may indicate which parameter the terminal device uses to calculate the transmission power, and optionally, the terminal device may further send auxiliary information to the network side device for the network side device to refer to, so as to make the above indication. In another embodiment, the terminal device may also determine the first indication information according to its own information.

S203, the terminal equipment obtains the parameters used for calculating the side link transmitting power according to the first indication information.

The first indication information indicates a parameter used for calculating the side link transmission power, and the terminal device may accurately determine the parameter according to the first indication information, that is, determine whether to calculate the transmission power based on the first path loss or the second path loss, or directly transmit data with the maximum transmission power as the transmission power.

And S204, the terminal equipment calculates the transmitting power of the side link according to the acquired parameters used for calculating the transmitting power of the side link.

If the terminal equipment determines to calculate the transmitting power based on the first path loss or the second path loss, the first path loss or the second path loss needs to be considered for compensation when calculating the transmitting power; and if the determined parameter is the maximum transmission power, the terminal equipment transmits data by taking the maximum transmission power as the transmission power.

It is understood that the terminal device may be a transmitting terminal or a receiving terminal of the side link, and any terminal that may perform side link data transmission may calculate the transmission power according to the above scheme.

According to the method for calculating the side link transmitting power, the parameters used for calculating the side link transmitting power can be accurately and flexibly determined according to the indication information, and the communication quality is improved.

If the coverage state of the terminal device performing sidelink communication changes, for example, the terminal device enters the coverage range from outside the coverage range, or enters the coverage range from inside the coverage range from outside the coverage range, the terminal device needs to determine what path loss is used for the transmission power calculation. A simpler and more intuitive solution is: terminal equipment continues to use a path loss. Such as: and continuously using the path loss to the network side equipment or continuously using the path loss to the communication opposite terminal equipment. The problem with this solution is that the power calculation cannot reflect the actual needs, power may be wasted or not enough, and interference may be caused to the uplink reception of the network side device or the reception of the correspondent device. Another simpler solution is: and the terminal equipment immediately uses the path loss to the equipment at the opposite communication end for power calculation when judging that the terminal equipment enters the coverage range, and immediately uses the path loss to the equipment at the network side for power calculation when judging that the terminal equipment enters the coverage range. The disadvantage of this solution is that for a terminal device with temporary or short-term coverage change, such as a terminal device at the edge of coverage, or a terminal device entering the coverage hole for a short time, the power is adjusted in a wide range for a short time (if the path loss to the network side device is greatly different from the path loss to the communication peer device). The power adjustment of the terminal equipment has certain influence on radio frequency and baseband, and the baseband needs to configure corresponding parameters to the radio frequency for each power adjustment; after obtaining the parameters provided by the baseband, the adjustment of the radio frequency requires a certain time. During the radio frequency adjustment time, parameters used for data transmission by the terminal device, such as Modulation and Coding Scheme (MCS), are also not well determined, for example, the terminal device may select a more conservative MCS to ensure communication quality, which may also have a certain influence on the communication rate.

Please refer to fig. 3, which is a flowchart illustrating another method for calculating a transmit power of an edge link according to an embodiment of the present application, wherein:

s301, the terminal device reports the related capability to the network side device.

The related capability may be that the terminal device has the capability of switching the transmission power calculation mode according to the state transition. Optionally, the capability may define the length of time required for the UE to make a state change. For example, a UE with low capability needs a long time to perform state transition; the UE with high capability needs a short time to perform the state transition. This capability may be related to the length of the timer in subsequent steps. For example, for a UE with low capability, the timer T is longer; and in the UE with high capability, the timer T is shorter. The terminal device reports the capability to the network side device, so that the network side device can send switching indication information to the terminal device according to the capability.

This step is optional and is shown in dashed lines.

S302, the network side equipment generates first indication information.

The first indication information is used for indicating a parameter used for calculating the side link transmission power. In this embodiment, the first indication information includes a time T. The time T is a period of time after the state of the terminal device changes. In this embodiment, the terminal device may be configured to use the first parameter in the first state and use the second parameter in the second state. The first parameter and the second parameter may be the same or different. Optionally, the first indication information is used to indicate that the first parameter continues to be used within a time T range after the terminal device transitions from the first state to the second state.

S303, the network side equipment sends the first indication information to the terminal equipment. Wherein the first indication information includes a time T.

Correspondingly, the terminal equipment receives the first indication information.

The time T may be configured by the network side device. Specifically, the network side device may transmit the first indication information through Downlink Control Information (DCI) or Radio Resource Control (RRC) signaling.

In addition, the time T may also be preconfigured, that is, the time T may be pre-burned into the terminal device when the terminal device leaves a factory; or when the terminal device establishes initial communication with the network side device, the network side device is configured to the terminal device.

S304, the terminal equipment judges that the state of the terminal equipment is changed from the first state to the second state.

The terminal equipment judges whether the state of the terminal equipment changes. The status state includes one or more of: coverage status, transmission type, link type. The coverage status includes in-coverage and out-of-coverage. The transmission types include unicast, multicast, and broadcast. The link types include unicast links, multicast links, and broadcast links.

Such as a change between broadcast and unicast communication modes. Since the broadcast reception object is uncertain, it is inconvenient to determine the transmission power according to the specific reception object, but the unicast communication object is determined, and the transmission power can be determined according to the actual path loss to the unicast communication object. Therefore, the unicast to broadcast conversion, or the broadcast to unicast conversion, may also bring about a change in the manner in which the transmission power is calculated.

S305, continuously using the first parameter in the time T range after the terminal equipment is changed from the first state to the second state.

In a specific implementation, the embodiment of the present application defines a timer T, which is used for changing the calculation mode of the transmission power in a delayed manner. Here, the change in the transmission power calculation method means that a formula for calculating the transmission power or a parameter used is changed, or the like. The timer is started when the coverage state of the terminal equipment is changed or after the coverage state of the terminal equipment is changed.

Within the range of the timer or before the timer is overtime, the terminal equipment calculates the transmitting power by using a first parameter, namely the terminal equipment continues to cause the original path loss when determining the transmitting power; and when the terminal equipment is out of the range of the timer, or the timer is overtime, or after the timer is overtime, the terminal equipment calculates the transmission power by using a second parameter, namely the terminal equipment changes the used path loss when determining the transmission power.

For example, when the terminal device is in the coverage area, the terminal device calculates the transmission power using the path loss to the network side device; when the terminal equipment is changed to be out of the coverage range, starting the timer, and before the timer is overtime, the terminal equipment continuously uses the path loss to the network side equipment to calculate the transmitting power; and after the timer is overtime, the terminal equipment calculates the transmitting power by using the path loss of the communication opposite terminal equipment. Or conversely, when the terminal device is out of the coverage area, the path loss to the communication opposite-end device is used when the terminal device calculates the transmitting power; when the terminal equipment is converted into the coverage range, starting the timer, and before the timer is overtime, the terminal equipment continuously uses the path loss to the equipment at the opposite communication end to calculate the transmitting power; and after the timer is overtime, the terminal equipment calculates the transmitting power by using the path loss of the network side equipment.

It should be noted that the out-of-coverage may not be caused by the network-side device not covering too far away from the terminal device and the network-side device, or may be caused by building obstruction, such as high-rise obstruction, or in a basement, so that the signal quality between the terminal device and the network-side device is poor.

Alternatively, the timer may be configured by proprietary signaling, broadcast message configuration, or predefined. Or define a default value that is used without additional configuration.

The timing may be related to the capabilities of the terminal device or to the traffic carried out by the terminal device (e.g. a specific timer is defined for a certain bearer).

S306, the terminal device calculates the transmitting power of the side link according to the determined first parameter.

In this embodiment, the terminal device may accurately determine the manner of calculating the transmit power by timing of the timer when the state of the terminal device changes, so as to accurately calculate the transmit power of the side link, which is beneficial to saving power consumption of the terminal device; and the frequent change of the transmitting power caused by the change of the terminal state can be avoided, thereby reducing the influence of the frequent change of the transmitting power on the radio frequency and the baseband of the terminal equipment.

According to the method for calculating the side link transmitting power, parameters used for calculating the side link transmitting power can be accurately and flexibly determined according to the indication information, and the communication quality is improved; and the frequent change of the transmitting power brought by the change of the state of the terminal equipment can be avoided, thereby reducing the influence of the frequent change of the power on the radio frequency and the baseband of the terminal equipment.

Please refer to fig. 4, which is a flowchart illustrating a method for calculating side link transmit power according to an embodiment of the present application, wherein:

s401, the terminal equipment acquires first indication information.

In this embodiment, which parameter is used by the terminal device to calculate the transmission power is autonomously determined by the terminal device. Wherein the parameters include one or more of the following information: the method comprises the steps that first path loss is the path loss between terminal equipment and network side equipment; a second path loss, which is a path loss between the terminal device and the communication opposite terminal device; and the maximum transmitting power is the maximum transmitting power which can be supported by the terminal equipment.

First, the terminal device acquires first indication information. The first indication information comprises characteristic information, the characteristic information has a corresponding relation with a parameter used for calculating the side link transmission power, and the characteristic information comprises one or more of the following information: path loss threshold, path loss selection priority, service type, bearer type, session type, and logical channel information. Optionally, the corresponding relationship between the characteristic information and the parameter used for calculating the side link transmission power may also be included in the first indication information.

In particular, in one implementation, a path loss threshold is defined, which may be configured by the network side device, or pre-configured. For example, the threshold may be a path loss threshold from the terminal device to the correspondent device. The threshold comprises a maximum threshold and a minimum threshold, or comprises a maximum threshold, or comprises a minimum threshold. The corresponding relation between the threshold and the parameter is as follows: if the path loss from the terminal device to the device at the opposite communication end is greater than the maximum threshold, interference to the network side device may be caused if the transmission power is calculated by using the path loss to the device at the opposite communication end. Therefore, the terminal device calculates the transmission power using the path loss to the network.

For another example, the threshold may be a path loss from the terminal device to the network side device. The threshold includes a maximum threshold and a minimum threshold, or includes a maximum threshold, or includes a minimum threshold. The corresponding relation between the threshold and the parameter is as follows: if the path loss from the terminal device to the network side device is greater than the maximum threshold, interference to the communication peer device may be caused if the transmission power is calculated by using the path loss to the network side device. Therefore, the terminal device calculates the transmission power using the path loss to the communication counterpart device. If the path loss from the terminal device to the network side device is smaller than the minimum threshold value, which may cause the calculated transmission power to be insufficient, the terminal device calculates the path loss or uses the maximum transmission power to the device at the opposite end of communication.

In another implementation, a path loss selection priority is defined, for example, a path loss to a device at the opposite end of communication is preferentially selected for power calculation, or a path loss to a device on the network side is preferentially selected for power calculation. The priority may be network side device configured, or pre-configured. And if the first indication information indicates which priority, selecting the path loss corresponding to the priority to calculate the transmission power. Optionally, the priority may be related to services, for example, some services preferentially use path loss to the peer device, and some services preferentially use path loss to the network. Optionally, the priority may be associated with logical channels, for example, some logical channels preferentially use the path loss of the opposite device, and some logical channels preferentially use the path loss of the network.

In yet another implementation, the terminal device may determine based on which path loss to calculate the transmit power based on the type of sidelink traffic the terminal device is engaged in. For example, if the service of the sidelink is important, the terminal device may use the path loss to the device at the opposite end of communication, so as to ensure the communication quality of the sidelink; otherwise, the path loss to the network side equipment is used, and the interference of the network side equipment for receiving the uplink data is reduced. Or, if the sidelink service is important, the terminal device calculates the transmission power by using the larger one of the path loss to the communication opposite terminal device and the path loss to the network side device.

Optionally, the network side device may configure or pre-configure the relationship between the service type and the path loss selection. For example, when the path loss to the device at the opposite communication end is greater than the path loss to the device at the network side, which services may use the path loss to the device at the opposite communication end to perform power calculation, and which services need to use the path loss to the device at the network side to perform power calculation.

In another implementation, when a bearer is established, the method may indicate a path loss selection for calculating the transmission power of data corresponding to the bearer by the terminal device, or indicate whether the bearer allows performing power calculation using the path loss to the network side device when the path loss to the device at the opposite end of communication is greater than the path loss to the network side device; or to indicate the bearer to use the maximum transmit power or whether the maximum transmit power is allowed to be used.

It can be understood that the above-mentioned scheme for determining the transmission power calculation manner according to the service type or the bearer may also be applied to determine the transmission power calculation manner according to the logical channel information, the session type, and the like, and the determination process is similar.

S402, the terminal equipment obtains the parameters used for calculating the side link transmitting power according to the corresponding relation between the characteristic information and the parameters used for calculating the side link transmitting power.

The terminal device may determine the parameter used for calculating the transmission power according to the correspondence between one or more of the path loss threshold, the path loss selection priority, the service type, the bearer type, the session type, and the logical channel information and the parameter.

And S403, the terminal equipment calculates the transmitting power of the side link according to the acquired parameters used for calculating the transmitting power of the side link.

In other embodiments, the network side device may instruct the terminal device to perform the transmission power calculation, where the information is used to instruct the terminal device to perform the path loss based on which the transmission power calculation is performed, or the transmission power calculation method.

Optionally, before the network side device indicates the information, the terminal device may provide auxiliary information to the network side device, for example, a path loss reported by the terminal device to the network side device and a path loss reported by the terminal device to a communication peer device, for reference by the network side device.

Optionally, the network side device may instruct the terminal device to perform the information of the Transmission Power calculation through DCI, an extension field of Transmission Power Control (TPC) signaling, or other signaling.

The information for making the transmit power calculation includes one or more of: and calculating the transmission power by using the maximum transmission power or based on the path loss to the network side equipment or based on the path loss to the equipment of the opposite communication terminal.

Further, information of bearers, services, logical channels, sessions, time, etc. may also be indicated in the signaling to indicate which bearers, services, logical channels, sessions, time, or from what time, the transmission power calculation mechanism indicated by the signaling may be used.

Based on the same concept of the method for calculating the side link transmission power in the foregoing embodiment, as shown in fig. 5, the present embodiment further provides a communication apparatus 500, where the communication apparatus 500 may be used to implement the methods shown in fig. 2 to fig. 4. The communication device 500 may be UE1 or UE2 as shown in fig. 1, or may be a component (e.g., a chip) applied to UE1 or UE 2. The communication apparatus 500 includes an acquisition unit 51 and a calculation unit 52; wherein:

an obtaining unit 51, configured to obtain first indication information, where the first indication information is used to indicate a parameter used for calculating side link transmission power;

the obtaining unit 51 is further configured to obtain, according to the first indication information, a parameter used for calculating the transmission power of the side link;

a calculating unit 52, configured to calculate the transmit power of the side link according to the obtained parameter used for calculating the transmit power of the side link.

In another implementation, the terminal device transitions from a first state to a second state, the first state uses a first parameter, the second state uses a second parameter, and the first indication information is time T;

the obtaining unit 51 is configured to continue to use the first parameter within a time T range after the terminal device changes from the first state to the second state;

wherein the first state comprises one or more of: coverage status, transmission type, link type.

In yet another implementation, the first indication information includes: the characteristic information and the parameters used for calculating the side link transmitting power have a corresponding relation, wherein the characteristic information comprises one or more of the following information: a path loss threshold, a path loss selection priority, a service type, a bearer type, a session type and logic channel information;

the obtaining unit 51 is configured to obtain the parameter used for calculating the side link transmission power according to the corresponding relationship between the feature information and the parameter used for calculating the side link transmission power.

More detailed descriptions about the obtaining unit 51 and the calculating unit 52 can be directly obtained by referring to the related descriptions of the terminal device in the method embodiments shown in fig. 2 to fig. 4, which are not repeated herein.

According to the communication device provided by the embodiment of the application, the parameters used for calculating the side link transmitting power can be accurately and flexibly determined according to the indication information, and the communication quality is improved.

Based on the same concept of the method for calculating the side link transmission power in the foregoing embodiment, as shown in fig. 6, the present embodiment further provides a communication apparatus 600, and the communication apparatus 600 may be configured to implement the methods shown in fig. 2 to fig. 4. The communication apparatus 600 may be a base station as shown in fig. 1 or other network side equipment. The communication device 600 includes a processing unit 61 and a transmitting unit 62; wherein:

a processing unit 61, configured to generate first indication information, where the first indication information is used to indicate a parameter used for calculating the side link transmission power;

a sending unit 62, configured to send the first indication information to a terminal device.

More detailed descriptions about the processing unit 61 and the sending unit 62 can be directly obtained by referring to the related descriptions of the network side device in the method embodiments shown in fig. 2 to fig. 4, which are not repeated herein.

According to the communication device provided by the embodiment of the application, the terminal equipment can accurately and flexibly determine the parameters used for calculating the side link transmitting power by sending the indication information, so that the communication quality is improved.

The embodiment of the application also provides a communication device, and the communication device is used for executing the side link transmission power calculation method. Part or all of the above-mentioned side link transmission power calculation method may be implemented by hardware or may be implemented by software.

Alternatively, the communication device may be a chip or an integrated circuit when embodied.

Optionally, when part or all of the side link transmission power calculation method in the foregoing embodiment is implemented by software, the communication apparatus includes: a memory for storing a program; a processor for executing a program stored in the memory, and when the program is executed, the processor makes the communication apparatus implement the edge link transmission power calculation method provided by the above-mentioned embodiment.

Alternatively, the memory may be a physically separate unit or may be integrated with the processor.

Alternatively, when part or all of the side link transmission power calculation method of the above embodiment is implemented by software, the communication device may include only a processor. The memory for storing the program is located outside the communication device and the processor is connected to the memory by means of a circuit/wire for reading and executing the program stored in the memory.

The processor may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.

The processor may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.

The memory may include volatile memory (volatile memory), such as random-access memory (RAM); the memory may also include a non-volatile memory (non-volatile memory), such as a flash memory (flash memory), a Hard Disk Drive (HDD) or a solid-state drive (SSD); the memory may also comprise a combination of memories of the kind described above.

Fig. 7 shows a simplified schematic diagram of a terminal device. For easy understanding and illustration, in fig. 7, the terminal device is exemplified by a mobile phone. As shown in fig. 7, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output means.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 7. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, an antenna and a radio frequency circuit having a transceiving function may be regarded as a receiving unit and a transmitting unit (which may also be collectively referred to as a transceiving unit) of a terminal device, and a processor having a processing function may be regarded as a processing unit of the terminal device. As shown in fig. 7, the terminal device includes a receiving unit 71, a processing unit 72, and a transmitting unit 73. The receiving unit 71 may also be referred to as a receiver, a receiving circuit, etc., and the transmitting unit 73 may also be referred to as a sender, a transmitter, a transmitting circuit, etc. A processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, or the like.

For example, in one embodiment, the receiving unit 71 is configured to perform the functions of the terminal device in step S201 in the embodiment shown in fig. 2, and the processing unit 72 is configured to perform steps S202 to S203 in the embodiment shown in fig. 2.

For example, in another embodiment, the sending unit 73 is configured to execute the functions of the terminal device in step S301 in the embodiment shown in fig. 3; the receiving unit 71 is configured to execute the function of the terminal device in step S302 in the embodiment shown in fig. 3; and the processing unit 72 is adapted to perform steps S303 to S305 in the embodiment shown in fig. 3.

For example, in a further embodiment, the processing unit 72 is adapted to perform steps S401-S403 in the embodiment shown in FIG. 4.

Fig. 8 shows a simplified schematic diagram of a network-side device. The network side device includes a radio frequency signal transmitting/receiving and converting portion and a portion 82, and the radio frequency signal transmitting/receiving and converting portion includes a receiving unit 81 portion and a transmitting unit 83 portion (which may be collectively referred to as a transmitting/receiving unit). The radio frequency signal receiving, transmitting and converting part is mainly used for receiving and transmitting radio frequency signals and converting the radio frequency signals and baseband signals; the 82 part is mainly used for baseband processing, control of network side equipment and the like. The receiving unit 81 may also be referred to as a receiver, a receiving circuit, etc., and the transmitting unit 83 may also be referred to as a sender, a transmitter, a transmitting circuit, etc. Part 82 is typically a control center of the network side device, and may be generally referred to as a processing unit, for controlling the network side device to perform the steps performed with respect to the network side device in fig. 3, fig. 4, or fig. 5. Reference is made in particular to the description of the relevant part above.

Section 82 may include one or more boards, each board may include one or more processors and one or more memories, the processors being configured to read and execute programs in the memories to implement baseband processing functions and control of the network side devices. If a plurality of single boards exist, the single boards can be interconnected to increase the processing capacity. As an optional implementation, multiple boards may share one or more processors, multiple boards may share one or more memories, or multiple boards may share one or more processors at the same time.

For example, in one embodiment, the sending unit 83 is configured to execute the function of the network-side device in step S201 in the embodiment shown in fig. 2.

For example, in another embodiment, the receiving unit 81 is configured to execute the function of the network side device in step S301 in the embodiment shown in fig. 3; and the sending unit 83 is configured to execute the function of the network-side device in step S302 in the embodiment shown in fig. 3.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the division of the unit is only one logical function division, and other division may be implemented in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. The shown or discussed mutual coupling, direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some interfaces, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are wholly or partially generated when the computer program instructions are loaded and executed 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 or transmitted over a computer-readable storage medium. The computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a read-only memory (ROM), or a Random Access Memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape, a magnetic disk, or an optical medium, such as a Digital Versatile Disk (DVD), or a semiconductor medium, such as a Solid State Disk (SSD).

Claims

1. A method for calculating side link transmission power includes:

acquiring first indication information, wherein the first indication information is used for indicating a first parameter used for calculating the side link transmitting power;

acquiring a first parameter used for calculating the side link transmitting power according to the first indication information;

calculating the transmitting power of the side link according to the acquired first parameter used for calculating the transmitting power of the side link;

the first indication information further comprises a time T, the terminal device is transited from the first state to the second state,

continuing to use the first parameter within the time T range after the terminal device is changed from the first state to the second state;

wherein the first state is different from the second state, the first state and the second state including one or more of: the method comprises the steps of covering state, sending type and link type, wherein the covering state comprises the inside covering range and the outside covering range, the sending type comprises unicast, multicast and broadcast, and the link type comprises a unicast link, a multicast link and a broadcast link;

the first parameter used for calculating the side link transmission power comprises one or more of the following information:

2. The method of claim 1, wherein the first indication information further comprises: the characteristic information has a corresponding relation with the first parameter used for calculating the side link transmission power, wherein the characteristic information comprises one or more of the following information: a path loss threshold, a path loss selection priority, a service type, a bearer type, a session type and logical channel information;

the obtaining the first parameter used for calculating the side link transmission power according to the first indication information includes:

and acquiring the first parameter used for calculating the side link transmitting power according to the corresponding relation between the characteristic information and the first parameter used for calculating the side link transmitting power.

3. The method of claim 1 or 2, wherein the first indication information is network configured, or pre-configured.

4. A method for calculating side link transmission power includes:

generating first indication information, wherein the first indication information is used for indicating a first parameter used for calculating the side link transmission power, and the first indication information further comprises time T;

sending the first indication information to a terminal device to indicate that the first parameter is continuously used within the time T range after the terminal device is changed from the first state to the second state;

wherein the first state is different from the second state, the first state and the second state including one or more of: the method comprises the steps of covering state, sending type and link type, wherein the covering state comprises a covering range and a covering range, the sending type comprises unicast, multicast and broadcast, and the link type comprises a unicast link, a multicast link and a broadcast link;

5. The method of claim 4, wherein the first indication information further comprises: the characteristic information and the first parameter used for calculating the side link transmitting power have a corresponding relation, wherein the characteristic information comprises one or more of the following information: path loss threshold, path loss selection priority, service type, bearer type, session type, and logical channel information.

6. A communications apparatus, comprising:

an obtaining unit, configured to obtain first indication information, where the first indication information is used to indicate a first parameter used for calculating side link transmission power, and the first indication information further includes time T;

the obtaining unit is further configured to obtain a first parameter used for calculating the side link transmission power according to the first indication information;

the calculation unit is used for calculating the transmitting power of the side link according to the acquired first parameter used for calculating the transmitting power of the side link;

the acquiring unit is used for the terminal equipment to change from a first state to a second state, and the first parameter is continuously used within the time T range after the terminal equipment is changed from the first state to the second state;

7. The communications apparatus of claim 6, wherein the first indication information further comprises: the characteristic information and the first parameter used for calculating the side link transmitting power have a corresponding relation, wherein the characteristic information comprises one or more of the following information: a path loss threshold, a path loss selection priority, a service type, a bearer type, a session type and logical channel information;

the obtaining unit is configured to obtain a first parameter used for calculating the side link transmission power according to the corresponding relationship between the feature information and the first parameter used for calculating the side link transmission power.

8. The communication apparatus according to claim 6 or 7, wherein the first indication information is network configured, or pre-configured.

9. A communications apparatus, comprising:

the device comprises a processing unit and a sending unit, wherein the processing unit is used for generating first indication information, the first indication information is used for indicating a first parameter used for calculating the side link transmitting power, and the first indication information also comprises time T;

a sending unit, configured to send the first indication information to a terminal device to indicate that the first parameter continues to be used within the time T range after the terminal device transitions from a first state to a second state;

10. The communications apparatus of claim 9, wherein the first indication information further comprises: the characteristic information has a corresponding relation with the first parameter used for calculating the side link transmitting power, wherein the characteristic information comprises one or more of the following information: path loss threshold, path loss selection priority, service type, bearer type, session type, and logical channel information.

11. A communications apparatus, comprising: the system comprises a processor and a transceiver device, wherein the processor is coupled with the transceiver device and is used for executing computer programs or instructions to control the transceiver device to receive and transmit information; when the computer program or instructions are executed by the processor, the processor is further configured to perform the steps of:

the first indication information further includes a time T, the communication device transitions from a first state to a second state,

continuing to use the first parameter within the time T after the communication device transitions from the first state to the second state;

12. The communication apparatus according to claim 11, wherein the first indication information further includes characteristic information having a correspondence relationship with the first parameter used for calculating the sidelink transmission power, wherein the characteristic information includes one or more of the following information: a path loss threshold, a path loss selection priority, a service type, a bearer type, a session type and logical channel information;

the step of the processor executing the first parameter used for obtaining the side link transmission power according to the first indication information includes:

13. The communication apparatus according to claim 11 or 12, wherein the first indication information is network configured, or pre-configured.

14. A communications apparatus, comprising: the system comprises a processor and a transceiver device, wherein the processor is coupled with the transceiver device and is used for executing computer programs or instructions to control the transceiver device to receive and transmit information; when the computer program or instructions are executed by the processor, the processor is further configured to perform the steps of:

generating first indication information, wherein the first indication information is used for indicating a first parameter used for calculating side link transmission power, and the first indication information further comprises time T;

15. The communications apparatus of claim 14, wherein the first indication information further comprises: the characteristic information has a corresponding relation with the first parameter used for calculating the side link transmitting power, wherein the characteristic information comprises one or more of the following information: path loss threshold, path loss selection priority, service type, bearer type, session type, and logical channel information.