CN110149689B

CN110149689B - Power control method and device

Info

Publication number: CN110149689B
Application number: CN201810142092.5A
Authority: CN
Inventors: 黎超
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-02-11
Filing date: 2018-02-11
Publication date: 2022-03-25
Anticipated expiration: 2038-02-11
Also published as: WO2019154088A1; CN110149689A

Abstract

The embodiment of the invention provides a method and a device for determining transmission power. In the method and the device, the terminal device measures signals sent by the network device based on one or more beam directions, and then obtains one or more measurement results, wherein the beam directions comprise the beam directions used by the terminal device on the side link and can also comprise the beam directions used by the terminal device on the cellular link. The terminal device determines a power control parameter, wherein the power control parameter is determined based on the one or more measurement results, and adjusts the sidelink transmission power according to the power control parameter. The terminal device may report one or more measurement results to the network device, and the network device determines a power control parameter based on the measurement results and then sends the power control parameter to the terminal device, so that the terminal device adjusts the side link transmission power according to the power control parameter. Therefore, the transmission power of the side link is controlled more accurately, and the interference of the side link communication to the network equipment is reduced.

Description

Power control method and device

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for power control.

Background

In a Long Term Evolution (LTE) communication system, Device to Device communication (D2D), Vehicle to internet (Vehicle to Evolution) communication is supported, and the basic communication idea is that direct communication between terminal devices can be realized through an edge link (SL), or with the aid of a network Device (e.g. Evolved node B (eNB), when the terminal Device is within the coverage area of the network Device, since the terminal Device is based on edge link communication and the terminal Device is based on the same carrier used by cellular communication (e.g. the uplink carrier of cellular communication used by edge link communication), the interference of edge link communication to the network Device needs to be considered, in order to plan for the above potential interference, in the edge link communication of LTE, a similar way to the uplink power control in the LTE cellular communication process is adopted, controls the transmission of sidelink communications.

Disclosure of Invention

The embodiment of the invention provides a method and a device for determining transmission power. The method is used for solving the problems of interference to a cellular link and incapability of fully utilizing transmission power resources in high-frequency-based side link communication.

In a first aspect, an embodiment of the present invention provides a method for determining transmit power. In the method, a first terminal device determines a power control parameter, wherein the power control parameter is determined based on a first beam direction, the first beam direction is a beam direction used by the first terminal device on an edge link, and the edge link is a communication link between the first terminal device and a second terminal device; and the first terminal equipment determines the transmitting power of the side link according to the power control parameter.

Because the first beam direction is considered, more basis is provided for determining the power control parameter, the determined power control parameter is more accurate, the interference to a cellular link can be reduced, and the power resource can be fully utilized.

In one possible design, the first terminal device measures a signal sent by the network device based on the first beam direction to obtain a first measurement result; the first terminal device determining a power control parameter, comprising: determining the power control parameter according to the first measurement result.

In one possible design, the first terminal device measures a signal transmitted by the network device based on a second beam direction to obtain a second measurement result, where the second beam direction is a beam direction used by the first terminal device on a cellular link, and the cellular link is a communication link between the first terminal device and the network device; the determining the power control parameter according to the first measurement result includes: determining the power control parameter according to the first measurement result and the second measurement result. Because different gains of the beam direction on the side link and the cellular link to the signal are considered, the power control parameter is determined more specifically, and therefore the determined power control parameter is more accurate.

In one possible design, the first terminal device measures a signal transmitted by the network device based on N third beam directions, and obtains N third measurement results, where each of the N third beam directions is a beam direction used on a communication link between the first terminal device and one of at least N other terminal devices; the determining the power control parameter according to the first measurement result includes: and the terminal equipment determines the power control parameter according to the first measurement result and the at least one third measurement result. By measuring the signals sent by the network equipment based on the directions of the multiple side link beams, the obtained measurement result is more stable, so that the determined power control parameters are more stable, and the complexity caused by frequent change of the power control parameters is reduced.

In one possible design, the first terminal device determines an average value of the first measurement result and the at least one third measurement result, wherein the power control parameter includes the average value, and the first terminal device determines the power control parameter according to the average value.

In one possible design, the first terminal device sends the first measurement result to the network device; the first terminal device determining the power control parameter includes: the first terminal device receives the power control parameter from a network device.

In one possible design, the first terminal device sends the first measurement result and the second measurement result to the network device; the first terminal device determining the power control parameter includes: the first terminal device receives the power control parameter from a network device.

In one possible design, the first terminal device sends a fourth measurement result to the network device, where the fourth measurement result is obtained according to the first measurement result and the second measurement result; the first terminal device determining the power control parameter includes: the first terminal device receives the power control parameter from a network device. By reporting the fourth measurement result, the signaling overhead of reporting can be reduced.

In one possible design, the fourth measurement is a difference between the first measurement and the second measurement; the first terminal device determining the power control parameter includes: the first terminal device receives the power control parameter from a network device.

In one possible design, the first terminal device sending the first measurement result and the N third measurement results to the network device, the first terminal device determining the power control parameter, including: the first terminal device receives the power control parameter from a network device.

In one possible design, the first terminal device sends a fifth measurement result to the network device, where the fifth measurement result is obtained according to the first measurement result and the N third measurement results; the first terminal device determining the power control parameter includes: the first terminal device receives the power control parameter from a network device. By reporting the fifth measurement result, the signaling overhead of reporting can be reduced.

In one possible design, the fifth measurement is an average of the first measurement and the at least one third measurement; the first terminal device determining the power control parameter includes: the first terminal device receives the power control parameter from a network device.

In one possible design, the first terminal device determines the transmit power based on a maximum transmit power and the power control parameter, where the transmit power is less than or equal to the maximum transmit power.

In one possible design, the first terminal device receives radio resource configuration information sent by the network device, where the radio resource configuration information includes at least one radio resource; the first terminal device determines the transmission power on the at least one radio resource according to the power control parameter.

In one possible design, the first terminal device receives subcarrier spacing configuration information sent by the network device, where the subcarrier spacing configuration information includes at least one subcarrier spacing, and the first terminal device determines the transmit power on at least one first radio resource according to the power control parameter, where the at least one first radio resource applies any one of the at least one subcarrier spacing.

In a second aspect, an embodiment of the present invention determines a method for determining a power control parameter, where the method includes a network device obtaining a first measurement result, where the first measurement result is obtained by measuring a signal sent by the network device based on a first beam direction, the first beam direction is a beam direction used by a first terminal device on a side link, and the side link is a communication link between the first terminal device and a second terminal device; and the network equipment determines a power control parameter according to the first measurement result, wherein the power control parameter is used for the first terminal equipment to determine the transmitting power of the side link.

In one possible design, the network device obtains a second measurement result, where the second measurement result is obtained by measuring a signal transmitted by the network device based on a second beam direction, where the second beam direction is a beam direction used by the first terminal device on a cellular link, and the cellular link is a communication link between the first terminal device and the network device; the network device determines the power control parameter according to the first measurement result and the second measurement result.

In one possible design, the network device obtains N third measurement results, where the N third measurement results are obtained by the first terminal device measuring signals transmitted by the network device based on N third beam directions, where each of the N third beam directions is a beam direction used on a communication link between the first terminal device and one of at least N other terminal devices; the network device determines the power control parameter according to the first measurement result and the at least one third measurement result.

In one possible design, the network device determines a difference between the first measurement and the second measurement, wherein the power control parameter includes the difference; and the network equipment determines the power control parameter according to the difference value.

In one possible design, the network device determines an average of the first measurement and the N third measurements, wherein the power control parameter includes the average; the network device determines the power control parameter based on the average.

In one possible design, the network device sends radio resource configuration information to the first terminal device, where the radio resource configuration information includes at least one radio resource used by the first terminal device to determine the transmit power on the at least one radio resource according to the power control parameter.

In one possible design, the network device sends subcarrier spacing configuration information to the first terminal device, where the subcarrier spacing configuration information includes at least one subcarrier spacing, and the at least one subcarrier spacing is used for the first terminal device to determine the transmit power on at least one first radio resource according to the power control parameter, and the at least one first radio resource applies any one subcarrier spacing in the at least one subcarrier spacing.

In one possible design, the network device sends the power control parameter to the first terminal device, and the network device sends the power control parameter to the first terminal device.

In a third aspect, the present invention provides a method for determining a power control parameter, where the method includes obtaining, by a network device, a fourth measurement result, where the fourth measurement result is a difference between a first measurement result and a second measurement result, where the first measurement result is obtained by measuring a signal sent by the network device based on a first beam direction, the first beam direction is a beam direction used by the first terminal device on a side link, the side link is a communication link between the first terminal device and a second terminal device, the second beam direction is a beam direction used by the first terminal device on a cellular link, and the cellular link is a communication link between the first terminal device and the network device; the network device determines a power control parameter according to the fourth measurement result, wherein the power control parameter is used for the first terminal device to determine the transmitting power of the side link; and the network equipment sends the power control parameter to the first terminal equipment. The method can further reduce signaling overhead.

In a fourth aspect, the present invention provides a method for determining power control, where the method includes obtaining, by a network device, a fifth measurement result, where the fifth measurement result is an average of a first measurement result and at least one third measurement result, where the first measurement result is obtained by measuring a signal transmitted by the network device based on a first beam direction, the first beam direction is a beam direction used by the first terminal device on a side link, the side link is a communication link between the first terminal device and a second terminal device, and the at least one third beam direction is a beam direction used on a communication link between the first terminal device and at least one other terminal device; the network device determines a power control parameter according to the fifth measurement result, wherein the power control parameter is used for the first terminal device to determine the transmitting power of the side link; and the network equipment sends the power control parameter to the first terminal equipment. The method can further reduce signaling overhead.

In a fifth aspect, an embodiment of the present invention provides a wireless apparatus, including a processor and a memory coupled to the processor, wherein the processor is configured to determine a power control parameter, where the power control parameter is determined based on a first beam direction, where the first beam direction is a beam direction used by the first terminal device on a side link, and the side link is a communication link between the first terminal device and a second terminal device; the processor is further configured to determine the transmit power of the side link according to the power control parameter.

In one possible design, the processor is configured to obtain a first measurement result based on a signal transmitted by the first beam direction measurement network device; the processor is further configured to determine the power control parameter according to the first measurement result.

In one possible design, the processor is configured to measure a signal transmitted by the network device based on a second beam direction to obtain a second measurement result, where the second beam direction is a beam direction used by the first terminal device on a cellular link, and the cellular link is a communication link between the first terminal device and the network device;

the processor is configured to determine the power control parameter according to the first measurement result and the second measurement result.

In one possible design, the processor is configured to measure a signal transmitted by the network device based on N third beam directions, and obtain N third measurement results, where each of the N third beam directions is a beam direction used on a communication link between the first terminal device and one of at least N other terminal devices; the processor is further configured to determine the power control parameter based on the first measurement and the at least one third measurement.

In one possible design, the processor is configured to determine a difference between the first measurement and the second measurement, wherein the power control parameter includes the difference; the processor is further configured to determine the power control parameter based on the difference.

In one possible design, the processor is configured to determine an average of the first measurement and the N third measurements, wherein the power control parameter includes the average; the processor is further configured to determine the power control parameter based on the average value.

In one possible design, the processor may be configured to determine the transmit power based on a maximum transmit power and the power control parameter, where the transmit power is less than or equal to the maximum transmit power.

In one possible design, further comprising: a transceiver, wherein the transceiver is configured to send the first measurement result to the network device; the transceiver is further configured to receive the power control parameter from a network device.

In one possible design, the transceiver is configured to send the first measurement result and the second measurement result to the network device; the transceiver is further configured to receive the power control parameter from a network device.

In one possible design, the transceiver is configured to send a fourth measurement result to the network device, where the fourth measurement result is obtained according to the first measurement result and the second measurement result; the transceiver is further configured to receive the power control parameter from a network device. By reporting the fourth measurement result, the signaling overhead of reporting can be reduced.

In one possible design, the fourth measurement is a difference between the first measurement and the second measurement.

In one possible design, the transceiver is configured to send the N third measurement results to the network device; the transceiver is further configured to receive the power control parameter from a network device.

In one possible design, the transceiver is configured to send a fifth measurement result to the network device, where the fifth measurement result is obtained according to the first measurement result and the at least one third measurement result; the transceiver is further configured to receive the power control parameter from a network device. By reporting the fifth measurement result, the signaling overhead of reporting can be reduced.

In one possible embodiment, the fifth measurement result is an average of the first measurement result and the at least one third measurement result.

In a sixth aspect, a wireless apparatus is provided, which includes a processor and a memory coupled to the processor, wherein the processor is configured to obtain a first measurement result, where the first measurement result is obtained by a first terminal device based on a signal transmitted by a first beam direction measurement network device, the first beam direction is a beam direction used by the first terminal device on an edge link, and the edge link is a communication link between the first terminal device and a second terminal device; the processor is further configured to determine a power control parameter according to the first measurement result, where the power control parameter is used by the first terminal device to determine the transmit power of the side link.

In one possible design, the transceiver is configured to obtain a second measurement result, where the second measurement result is obtained by a first terminal device measuring a signal transmitted by the network device based on a second beam direction, where the second beam direction is a beam direction used by the first terminal device on a cellular link, and the cellular link is a communication link between the first terminal device and the network device; the processor is further configured to determine the power control parameter according to the first measurement result and the second measurement result.

In one possible design, the processor is configured to obtain N third measurement results, where the N third measurement results are obtained by the first terminal device measuring signals transmitted by the network device based on N third beam directions, where each of the N third beam directions is a beam direction used on a communication link between the first terminal device and one of at least N other terminal devices; the processor is further configured to determine the power control parameter according to the first measurement result and the N third measurement results.

In one possible design, the processor is configured to determine an average of the first measurement and the at least one third measurement, wherein the power control parameter includes the average; the processor is further configured to determine the power control parameter based on the average.

In one possible design, the method further includes sending, by the transceiver, radio resource configuration information to the first terminal device, where the radio resource configuration information includes at least one radio resource used by the first terminal device to determine the transmit power on the at least one radio resource according to the power control parameter.

In one possible design, the transceiver is configured to send subcarrier spacing configuration information to the first terminal device, where the subcarrier spacing configuration information includes at least one subcarrier spacing, and the at least one subcarrier spacing is used for the first terminal device to determine the transmit power on at least one first radio resource according to the power control parameter, and the at least one first radio resource applies any one subcarrier spacing of the at least one subcarrier spacing.

In a seventh aspect, an implementation of the present invention provides a wireless apparatus, including: a processor and a memory coupled to the processor, wherein the processor is configured to obtain a fourth measurement result, the fourth measurement result being a difference between a first measurement result and a second measurement result, the first measurement result being obtained by measuring a signal transmitted by the network device based on a first beam direction, the first beam direction being a beam direction used by the first terminal device on a side link, the side link being a communication link between the first terminal device and a second terminal device, the second beam direction being a beam direction used by the first terminal device on a cellular link, and the cellular link being a communication link between the first terminal device and a network device; the processor is further configured to determine a power control parameter according to the fourth measurement result, where the power control parameter is used by the first terminal device to determine the transmission power of the side link

In an eighth aspect, an embodiment of the present invention provides a wireless device, comprising a processor and a memory coupled to the processor; the processor is configured to obtain a fifth measurement result, where the fifth measurement result is an average of a first measurement result and the N third measurement results, where the first measurement result is obtained by measuring a signal sent by the network device based on a first beam direction, the first beam direction is a beam direction used by the first terminal device on an edge link, the edge link is a communication link between the first terminal device and a second terminal device, and each of the N third beam directions is a beam direction used on a communication link between the first terminal device and one of at least N other terminal devices; and the processor is configured to determine a power control parameter according to the fifth measurement result, where the power control parameter is used by the first terminal device to determine the side link transmission power.

In combination with possible combinations of various possible designs of the sixth to eighth aspects, the method further comprises a transceiver, wherein the transceiver is configured to transmit the power control parameter to the first terminal device. Signaling overhead may be reduced.

In combination with possible combinations of the various possible designs of the sixth to eighth aspects, the transceiver is configured to receive the first measurement result from the first terminal device.

In combination with possible combinations of the various possible designs of the sixth to eighth aspects, the transceiver is configured to receive the first measurement result and the second measurement result from the first terminal device.

In combination with possible combinations of the possible designs of the sixth to eighth aspects and possible combinations of the possible designs of the sixth aspect, the transceiver is configured to receive the first measurement result and the N third measurement results from the first terminal device.

In combination with possible combinations of the various possible designs of the sixth to eighth aspects, the transceiver is configured to receive the fourth measurement result from the first terminal device.

In combination with possible combinations of the various possible designs of the sixth to eighth aspects, the transceiver is configured to receive the fifth measurement result from the first terminal device.

In one possible design, the signal transmitted by the network device includes at least one of: cell Reference Signals (CRS); a channel state indication reference signal (CSI-RS); a Synchronization Signal (SS); a Synchronization Signal Block (SSB) demodulates a reference signal (DMRS).

In combination with the above aspects and possible combinations of the above aspects and possible designs, the first measurement result is any one of the following: reference Signal Received Power (RSRP); a Reference Signal Received Quality (RSRQ); signal to interference noise ratio (SINR); a Reference Signal Strength Indication (RSSI); second path loss (PathLoss).

In combination with the above aspects, and possible combinations of the above aspects and possible designs, the first measurement result and the second measurement result are any one of: reference Signal Received Power (RSRP); a Reference Signal Received Quality (RSRQ); signal to interference noise ratio (SINR); a Reference Signal Strength Indication (RSSI); second path loss (PathLoss).

In combination with the above aspects and possible combinations of the above aspects and possible designs, the first measurement result and the at least one third measurement result are any one of: reference Signal Received Power (RSRP); a Reference Signal Received Quality (RSRQ); signal to interference noise ratio (SINR); a Reference Signal Strength Indication (RSSI); second path loss (PathLoss).

In combination with the above aspects and possible combinations of the above aspects and possible designs, the first beam direction is predefined or configured by the network device or determined by the first terminal device;

in combination with the above aspects and possible combinations of the above aspects and possible designs, the second beam direction is predefined for a protocol, or configured or preconfigured by the network device, or determined by the first terminal device;

in combination with the above aspects and possible combinations of the above aspects and possible designs, the at least one third beam direction is predefined for a protocol or configured or preconfigured by the network device or determined by the first terminal device.

In a ninth aspect, a computer storage medium is provided for storing computer software instructions for the first terminal device, including program instructions for performing the above aspects.

In a tenth aspect, a computer storage medium is provided for storing computer software instructions for the network device, including program instructions for performing the above aspects.

In an eleventh aspect, a communication device is provided, which includes a processor and a memory connected to the processor, the memory being used for storing instructions, and the processor being used for reading and executing the instructions in the memory to control the communication device to perform the method in the embodiments of the present invention.

Drawings

Fig. 1 is a diagram of a wireless communication system according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a possible structure of a network device in the wireless communication system.

Fig. 3 is a schematic diagram of a possible structure of a terminal device in the wireless communication system.

Fig. 4 is a flow chart illustrating a method of determining transmit power.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be noted that, in the case of no conflict, the technical solutions or features in the embodiments of the present invention may be combined with each other.

It should be understood that the present invention is applicable to wireless communication systems. For example, Long Term Evolution (LTE) Device-to-Device (D2D) communication, enhanced D2D communication, Vehicle-to-internet (Vehicle-to-Evolution) communication, including Vehicle-to-Vehicle (V2V), Vehicle-to-person (V2P), Vehicle-to-Infrastructure (V2I) and the like communication, a side link communication-based communication system in a 5G communication system, and the like. The embodiment of the present invention takes V2V communication in a 5G communication system as an example, and does not limit the technical solution provided by the embodiment of the present invention, and as a person of ordinary skill in the art knows that, with the appearance of a new service scenario and the evolution of a network architecture, the technical solution provided by the embodiment of the present invention is also applicable to similar technical problems.

Fig. 1 is a diagram of a wireless communication system according to an embodiment of the present invention. Fig. 1 shows an application scenario of an embodiment of the present invention, where the scenario includes a network device 101 and a network device 102 (for simplicity, only 4 network devices are shown in the drawing, but it does not mean that only 2 network devices are shown, and in fact, there may be any number of network devices), and terminal devices 111 to 114 (for simplicity, only 4 terminal devices are shown in the drawing, but it does not mean that only 4 terminal devices are shown, and in fact, there may be any number of terminal devices), where part or all of the terminal devices 111 to 114 may be located within a coverage area of the network device 101 or located outside the coverage area of the network device 101. Network device 101 communicates with one or more of terminal devices 111-114 over an air interface (which is a Uu interface as in LTE and 5G systems). For example, in fig. 1, the

terminal devices

113 and 114 transmit signaling and/or data to the network device using uplink physical resources. The terminal devices 111-114 may also communicate via side links, as shown in fig. 1, the terminal device 111 and the terminal device 112 communicate via a side link 121. The network device 101 and the network device 102 communicate with each other via a transport interface 141, and in the LTE system, the interface 141 is an X2 interface.

It should be understood that, in the embodiment of the present invention, a network device (e.g., network device 101) is a device deployed in a radio access network to provide a wireless communication function for a terminal device. The network devices may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like. The network device may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB, NB) in WCDMA, an evolved Node B (eNB or e-NodeB) in LTE or LTE, or a next generation mobile network, for example, a Base Station gNB (next) generation NodeB in 5g (fine generation). For convenience of description, in this application, it is referred to as a network device or a network device, and sometimes referred to as a base station.

It should be further understood that, in the embodiment of the present invention, a Terminal device may also be referred to as a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), and the like, where the Terminal device may communicate with one or more core networks through a Radio Access Network (RAN), for example, the Terminal device is a device with a Radio transceiver function, and may be deployed on land, including indoor or outdoor, handheld, or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a 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 remote medical (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. For convenience of description, in this application, it is simply referred to as terminal equipment or UE.

Fig. 2 is a schematic diagram of a possible structure of a network device in the wireless communication system. The network device may be any of the network devices 101-102 of FIG. 1. The network device can execute the method provided by the embodiment of the invention. Wherein, this network equipment can include: a controller or processor 201 (the processor 201 is described below as an example), and a transceiver 202. Controller/processor 201 is also sometimes referred to as a modem processor (modem processor). Modem processor 201 may include a baseband processor (BBP) (not shown) that processes the digitized received signal to extract the information or data bits conveyed in the signal. As such, the BBP is typically implemented in one or more Digital Signal Processors (DSPs) within modem processor 201 or as a separate Integrated Circuit (IC) as needed or desired.

The transceiver 202 may be used to support the transceiving of information between network devices and terminal devices, as well as to support radio communication between terminal devices. The processor 201 may also be used to perform various terminal device communication functions with other network devices. In the uplink, uplink signals from the terminal device are received via the antenna, demodulated by the transceiver 202, and further processed by the processor 201 to recover traffic data and/or signaling information sent by the terminal device. On the downlink, traffic data and/or signaling messages are processed by the terminal device and modulated by transceiver 202 to generate a downlink signal, which is transmitted via the antenna to the UE. The network device may also include a memory 203 that may be used to store program codes and/or data for the network device. The transceiver 202 may include separate receiver and transmitter circuits or may be the same circuit that performs the transceiving function. The network device may further comprise a communication unit 204 for enabling the network device to communicate with other network entities. For example, for supporting the network device 101 to communicate with a network device of a core network, etc.

Optionally, the network device 101 may also include a bus. The transceiver 202, the memory 203, and the communication unit 204 may be connected to the processor 201 via a bus. For example, the bus may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may include an address bus, a data bus, and a control bus, among others.

Fig. 3 is a schematic diagram of a possible structure of a terminal device in the wireless communication system. The terminal equipment can execute the method provided by the embodiment of the invention. The terminal device may be any one of 4 terminal devices 111 to 114. The terminal device includes a transceiver 301, an application processor (application processor)302, a memory 303, and a modem processor (modem processor) 304.

Transceiver 301 may condition (e.g., analog convert, filter, amplify, and upconvert, etc.) the output samples and generate an uplink signal, which is transmitted via an antenna to the base station as described in the above-described embodiments. On the downlink, the antenna receives a downlink signal transmitted by the access network device. Transceiver 301 may condition (e.g., filter, amplify, downconvert, digitize, etc.) the received signal from the antenna and provide input samples.

Modem processor 304, sometimes referred to as a controller or processor, may include a baseband processor (BBP) (not shown) that processes a digitized received signal to extract the information or data bits conveyed in the signal. The BBP is typically implemented in one or more numbers within modem processor 304 or as separate Integrated Circuits (ICs) as needed or desired.

In one design, a modem processor (modem processor)304 may include an encoder 3041, a modulator 3042, a decoder 3043, and a demodulator 3044. The encoder 3041 is configured to encode a signal to be transmitted. For example, the encoder 3041 can be used to receive traffic data and/or signaling messages to be sent on the uplink and process (e.g., format, encode, interleave, etc.) the traffic data and signaling messages. The modulator 3042 is configured to modulate an output signal of the encoder 3041. For example, the modulator may process symbol mapping and/or modulation, etc., of the encoder's output signals (data and/or signaling) and provide output samples. The demodulator 3044 is configured to perform demodulation processing on the input signal. For example, demodulator 3044 processes the input samples and provides symbol estimates. The decoder 3043 is configured to decode the demodulated input signal. For example, the decoder 3043 deinterleaves, decodes, or the like the demodulated input signal, and outputs a decoded signal (data and/or signaling). Encoder 3041, modulator 3042, demodulator 3044, and decoder 3043 may be implemented by a combined modem processor 304. These elements are processed according to the radio access technology employed by the radio access network.

Modem processor 304 receives digitized data, which may represent voice, data, or control information, from application processor 302 and processes the digitized data for transmission. The modem processor may support one or more of various wireless communication protocols of various communication systems, such as LTE, new air interface, Universal Mobile Telecommunications System (UMTS), High Speed Packet Access (HSPA), and so on. Optionally, one or more memories may also be included in modem processor 304.

Alternatively, the modem processor 304 and the application processor 302 may be integrated in a single processor chip.

The memory 303 is used to store program code (also sometimes referred to as programs, instructions, software, etc.) and/or data used to support communication for the terminal devices.

It should be noted that the memory 203 or the memory 303 may include one or more memory units, for example, a memory unit inside the processor 201 or the modem processor 304 or the application processor 302 for storing program codes, or an external memory unit independent from the processor 201 or the modem processor 304 or the application processor 302, or a component including a memory unit inside the processor 201 or the modem processor 304 or the application processor 302 and an external memory unit independent from the processor 201 or the modem processor 304 or the application processor 302.

Processor 201 and modem processor 301 may be the same type of processor or may be different types of processors. For example, the present invention may be implemented in a Central Processing Unit (CPU), a general purpose Processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, other Integrated circuits, or any combination thereof. The processor 201 and modem processor 301 may implement or execute the various illustrative logical blocks, modules, and circuits described in connection with the disclosure of embodiments of the invention. The processor may also be a combination of devices implementing computing functionality, including for example one or more microprocessor combinations, DSP and microprocessor combinations or system-on-a-chip (SOC) or the like.

Those of skill in the art would appreciate that the various illustrative logical blocks, modules, circuits, and algorithms described in connection with the aspects disclosed herein may be implemented as electronic hardware, instructions stored in a memory or another computer-readable medium and executed by a processor or other processing device, or combinations of both. As an example, the apparatus described herein may be used in any circuit, hardware component, IC, or IC chip. The memory disclosed herein may be any type and size of memory and may be configured to store any type of information as desired. To clearly illustrate this interchangeability, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. How such functionality is implemented depends upon the particular application, design choices, and/or design constraints imposed on the overall system. 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 invention.

In the LTE system, in order to reduce interference of uplink transmission of a terminal device to a network device, uplink power control is adopted. Specifically, for a Physical Uplink Shared Channel (PUSCH), the terminal device calculates the transmission power on the subframe i and the serving cell c based on the following formula (1):

wherein, P_CMAX,c(i) Denoted as the subframe i configured for the terminal device, the maximum transmit power on serving cell c. M_PUSCH,c(i) The bandwidth (the number of resource blocks) of the PUSCH resource allocated to the terminal device in the subframe i and the serving cell c is shown. P_{O_PUSCH,c}(j) Expressed as a power reference value or initial transmit power configured for the terminal device, where j represents the type of transmission on the PUSCH, e.g. for a new or retransmission using a Semi-Persistent Grant (Semi-Persistent Grant), j is 0, forNew or retransmission j ═ 1 using a Dynamic scheduled Grant. Alpha is alpha_c(j) Representing the amount of compensation for the path loss configured for the terminal device. PL_cThe downlink path loss of serving cell c estimated for the terminal device. Delta_TF,c(i) Indicating the power adjustment value of the terminal device based on the Modulation and Coding Scheme (MCS) in the subframe i and the serving cell c. f. of_c(i) Indicating an adjustment value based on a Transmit Power Control (TPC) command by the terminal device in subframe i, serving cell c. [ dBm ]]Representing units of transmit power.

Similarly, for a Physical Sidelink Shared Channel (psch), the terminal device calculates the transmit power based on the following equation (2):

P_PSSCH＝min{P_CMAX,PSSCH,10log₁₀(M_PSSCH)+P_{O_PSSCH,1}+α_PSSCH,1·PL}[dBm] (2)

wherein, P_CMAX,PSSCHIndicating the maximum transmit power of the terminal device on the psch. M_PSSCHIndicates the bandwidth (number of resource blocks) of the psch. PL being PL_cWherein PL_cIs PL in the formula (1)_c。P_{O_PSSCH,1}Represents a power reference value, or initial transmit power; alpha is alpha_PSSCH,1Representing the amount of compensation for the path loss.

The power control method is applied to low frequency band scenes (such as 2GHz or 3GHz and below). Since in the low-range scenario the terminal device transmits signals omnidirectionally, i.e. the transmit power of the terminal device appears to be the same in the side-link and cellular-link communication directions. However, with the development of communication, high-frequency-based side link communication is also an important scenario and may even be a main scenario, for example, in a future 5G communication system, a high-frequency-based side link communication technology may be researched. Due to the channel model based on high-frequency communication, the antenna transceiving modes of the terminal devices of the network devices are different. Therefore, the conventional power control method cannot adapt to high-frequency-based side link communication, and thus cannot effectively reduce interference to the cellular link.

In order to solve the above problem, an embodiment of the present invention provides a method for power control. The terminal equipment measures signals sent by the network equipment based on different beam directions, and then different measurement results are obtained. The terminal device determines the transmit power on its side link based on these measurements. For example, based on these measurement results, an adjustment amount is added based on the above formula (2). When calculating the path loss, the path loss in the above formula (2) can be obtained from a plurality of measurement results. The method provided by the embodiment of the invention can effectively solve the power control problem of high-frequency-based side link communication and effectively reduce uplink interference.

Fig. 4 is a flow chart illustrating a method of determining transmit power. The embodiment shown in fig. 4 comprises the following steps.

S400, the network device sends the beam configuration information to the first terminal device, and the first terminal device receives the beam configuration information sent by the network device.

Specifically, the beam configuration information includes configuration information of M beam directions, or includes configuration information of a beam direction set, where the beam direction set includes M beam directions, and M is a positive integer, such as M ═ 1, 2, 3, and so on.

Specifically, in the high-frequency-based communication process, the first terminal device may adopt beamforming to improve the quality of the communication link.

Further, the beam configuration information includes first beam direction configuration information, where the first beam direction is a beam direction used by the first terminal device on a side link, and the side link is a communication link between the first terminal device and the second terminal device. Specifically, the configuration information includes identification information for identifying the first beam direction, or includes identification information of a reference signal for identifying the first beam direction.

Further, the first beam direction may be a beam direction used by the first terminal device to transmit signals on the side link or a beam direction used to receive signals on the side link.

Further, optionally, the beam configuration information further includes second beam direction configuration information, and a direction of the second beam is different from a direction of the first beam. For example, the second beam direction is a beam direction used when the first terminal device communicates with the network device, that is, the second beam direction is a cellular link communication direction. Specifically, the configuration information includes identification information for identifying the second beam direction, or includes identification information of a reference signal for identifying the second beam direction.

Further, the second beam direction may be a beam direction used by the first terminal device to transmit signals on the cellular link or a beam direction used to receive signals on the cellular link.

Further, optionally, the beam configuration information further includes N third beam direction configuration information, where any one of the N third beam directions is different from the first beam direction. For example, one of the third beam directions is a beam direction used on a communication link between the first terminal device and a third terminal device, and the third terminal device is a terminal device different from the second terminal device, or the third terminal device is a virtual terminal device, and is only used to describe the third beam direction. The other third beam direction is a beam direction used on a communication link between the first terminal device and a fourth terminal device, where the fourth terminal device is a terminal device different from the second terminal device, or the fourth terminal device is a virtual terminal device, and is only used to describe the third beam direction. The beam direction used on the communication link between the first terminal device and the fourth terminal device may be the same as or different from the beam direction used on the communication link between the first terminal device and the third terminal device, and the present invention is not limited thereto. The other third beam directions are similar and will not be described herein. Specifically, the configuration information includes identification information for identifying the N third beam directions, or includes identification information for identifying reference signals of the N third beam directions.

In one implementation, the beam configuration information (or referred to as beam direction set configuration information) includes information of the first beam direction.

Further, the beam configuration information further includes Measurement Quantity (Measurement Quantity) configuration information, and specifically, the Measurement Quantity may be at least one of the following items:

-Reference Signal Received Power (RSRP);

-Reference Signal Receiving Quality (RSRQ);

-Signal to interference noise Ratio (SINR);

-Reference Signal Strength Indicator (RSSI);

-second path loss (Pathloss).

Further, the network device sends radio resource configuration information to the terminal device to instruct the first terminal device to determine the transmission power on the resource included in the radio resource configuration information according to the power control parameter, and the corresponding terminal device receives the radio resource configuration information sent by the network device. For example, the radio resource configuration information includes resource pool 1 (or frequency band 1), and the method of the embodiment of the present invention is applied; the radio resource configuration information does not include a resource pool 2 (or a frequency band 2), and the direction of the prior art is applied; the radio resource configuration information includes a resource pool 3 (or a frequency band 3), and the method of the embodiment of the present invention is applied, but configuration information different from the resource pool 1 is used (for example, corresponding to the resource pool 1, the first beam direction in the beam configuration information is a side link transmission beam direction, and corresponding to the resource pool 3, the first beam direction in the beam configuration information is a side link reception beam direction, or the measurement quantity is different, or the number of included beam directions is different, and the present invention is not limited).

Further, the network device sends subcarrier interval configuration information to the terminal device, where the subcarrier interval configuration information includes at least one subcarrier interval to instruct the first terminal device to determine the transmission power on the first radio resource according to the power control parameter, where the first radio resource is a radio resource applying any one of the at least one subcarrier interval included in the subcarrier interval configuration information, and the corresponding terminal device receives the radio resource configuration information sent by the network device. Specifically, in the high-frequency-based side link communication process, different resources may adopt different subcarrier intervals, for example, a 15KHz subcarrier interval is adopted below 3GHz, a 30KHz subcarrier interval is adopted between 3GHz and 6GHz, and different power control methods may be applied to different subcarrier intervals. For example, the method of the embodiment of the invention is applied by adopting the resource of the 15KHz subcarrier; the method of the embodiment of the present invention is applied to resources using 30KHz subcarriers, but configuration information different from the resources using 15KHz subcarriers is used (for example, corresponding to the resources using 15KHz subcarriers, the first beam direction in the beam configuration information is the side link transmission beam direction, and the resources using 30KHz subcarriers, the first beam direction in the beam configuration information is the side link reception beam direction, or the measurement amount is different, or the number of included beam directions is different, and so on).

Further, the beam configuration information may be sent through Radio Resource Control (RRC) signaling, and further, may be sent through dedicated RRC signaling or broadcast message, which is not limited in the present invention. The beam configuration information may also be sent through Media Access Control (MAC) signaling, or physical layer signaling, or the beam configuration information may be sent in a combination of the above manners, that is, at this time, RRC signaling sends a part of configuration information, and/or MAC signaling sends a part of configuration information, and/or physical layer signaling sends a part of configuration information, and the present invention is not limited thereto.

The operation of sending in this step may be implemented by the transceiver 202 of any one of the network devices 101 to 102, or may be implemented by the controller/processor 201 of the network device 101 and the transceiver 202 together.

The operation of receiving in this step may be implemented by the transceiver 301 of any one of the terminal devices 111 to 114, or may be implemented by the modem processor 304 of any one of the terminal devices 111 to 114 together with the transceiver 301.

Alternatively, part or all of the beam configuration information of this step may be fixed in the protocol or determined by the first terminal device. If all of the beam configuration information is fixed in the protocol or determined by the first terminal device, the network device does not need to send to the first terminal device, nor does the first terminal device need to receive the beam configuration information from the network device, such as the first beam direction is fixed in the protocol, or the second beam direction is fixed in the protocol, etc. At this time, this step may be replaced by S400, and the terminal device obtains the beam configuration information, and the content included in the beam configuration information is the same as above, which is not described herein again. Accordingly, the operation obtained in this step is realized by the modem processor 304 of any one of the terminal devices 111 to 114.

S401, the first terminal device measures according to the beam configuration information to obtain a measurement result.

The signals transmitted by the network may include at least one of:

-Cell-specific Reference Signal (CRS);

-Channel State indicator Reference Signal (CSI-RS);

-a Synchronization Signal (SS);

-a Synchronization Signal Block (SSB);

-Demodulation Reference signal (DMRS).

Specifically, the first terminal device measures a signal sent by the network based on a first beam direction included in the beam configuration information, and obtains a first measurement result.

According to the difference of the measurement amount configured in the beam configuration information in S400, the first measurement result obtained by the terminal device is also different. Such as:

when the configured measurement quantity is RSRP, the first measurement result is RSRP (such as-70 dBm);

when the configured measurement quantity is RSRQ, the first measurement result is RSRQ (e.g., 20 dB);

when the configured measurement is RSSI, the first measurement is RSSI (e.g., -50 dBm);

when the configured measurement is path loss, the first measurement is a path loss value (e.g., 40dB), referred to herein as a second path loss.

Further, the first terminal device measures a signal sent by the network device based on a second beam direction included in the beam configuration information, and obtains a second measurement result.

According to the difference of the measurement amount configured in the beam configuration information in S400, the second measurement result obtained by the terminal device is also different. Such as:

when the configured measurement quantity is RSRP, the second measurement result is RSRP as-70 dBm);

when the configured measurement quantity is RSRQ, the second measurement result is RSRQ (e.g., 20 dB);

when the configured measurement is RSSI, the second measurement is RSSI (e.g., -50 dBm);

when the configured measurement is path loss, the second measurement is a path loss value (e.g., 40dB), referred to herein as a second path loss.

Further, the first measurement result and the second measurement result are measurement results for the same measurement, such as both measurement results for RSRP or both measurement results for RSRQ.

Further, the first terminal device determines the difference between the first measurement result and the second measurement result, for example, by looking up a table, or by calculation, which is not limited in the present invention. For example, assume that the first measurement result is an Rsrp of a signal transmitted from the measurement network device based on the side link communication reception direction₁And the second measurement result is that the first terminal equipment measures Rsrp of the signal sent by the network equipment based on the cellular link communication receiving direction₂Then the difference D ═ Rsrp can be calculated₁-Rsrp₂. It will be appreciated that the difference may also be expressed as D ═ Rsrp₂-Rsrp₁Or the first two methods may be followed by taking the absolute value, and the invention is not limited.

Further, optionally, the first terminal device measures, based on N third beam directions included in the beam configuration information, signals sent by the network device, and obtains N third measurement results.

Further, the first terminal device calculates an average value of the N third measurement results. For example, assuming that the measurement result is a path loss, the first terminal device sums the path losses measured based on each beam direction, and then divides the sum by the number N of beam directions to obtain an equivalent path loss:

where i in subscript (i,3) is used to indicate a path loss for a third beam direction and 3 in subscript (i,3) is used to indicate a path loss measured based on the third beam direction, referred to herein as the first path loss.

Further, the first terminal device determines an arithmetic mean of the first measurement and the N third measurements,

where i in subscripts (i,3) is used to indicate a path loss for a third beam direction, 3 in subscripts (i,3) is used to indicate a path loss measured based on the third beam direction, and subscript (0, 1) is used to indicate a path loss measured based on the first beam direction, referred to herein as a first path loss.

Further, different beam directions may have different weights when calculating the equivalent path loss (or first path loss). The invention is not limited.

The operation of this step may be implemented by the transceiver 301 of any one of the terminal devices 111 to 114, or may be implemented by the modem processor 304 of any one of the terminal devices 111 to 114 together with the transceiver 301.

S402, the first terminal device sends the measuring result to the network device, and the network device receives the measuring result sent by the first terminal device.

In particular, the measurement result may comprise a first measurement result. For example, when the beam configuration information includes the first beam direction configuration information, the measurement result may include the first measurement result.

Further, the measurement result may include a second measurement result. For example, when the beam configuration information includes the second beam direction configuration information, the measurement result may include the second measurement result.

Further, the measurement results may include a first measurement result and a second measurement result.

Further, the measurement result may include a fourth measurement result, which is a difference between the first measurement result and the second measurement result.

Further, the measurement results may include measurement results measured based on the first beam direction and each of the N third beam directions.

Further, the measurement result may include a fifth measurement result that is an average of the measurement results measured based on the first beam direction and each of the N third beam directions.

Further, the terminal device sends the message through dedicated RRC signaling, system broadcast message, MAC layer signaling, or physical layer signaling, which is not limited in the present invention.

The operation of sending in this step may be implemented by the transceiver 301 of any one of the terminal devices 111 to 114, or may be implemented by the modem processor 304 of any one of the terminal devices 111 to 114 together with the transceiver 301.

The operation received in this step may be performed by the transceiver 202 of any one of the network devices 101-102, or may be performed by the controller/processor 201 of the network device 101 and the transceiver 202 together.

This step is optional.

S403, the network device determines a power control parameter according to the received measurement result.

Specifically, the power control parameter includes a power adjustment value X. The power adjustment value is generated by the network device according to the first measurement result reported by the first terminal device, or according to the first measurement result and the second measurement result, or according to the first measurement result and/or the N third measurement results reported by the first terminal device, so as to generate a power control parameter.

Further, the power control parameter includes an equivalent path loss (or a first path loss), where the equivalent path loss (or the first path loss) is determined by the network device according to N third measurement results reported by the first terminal device and when the measurement result is a path loss, where the method for determining the equivalent path loss is to determine the equivalent path loss

Where i in subscripts (i,3) is used to indicate a path loss for a third beam direction and 3 in subscripts (i,3) is used to indicate a path loss measured based on the third beam direction. Or, the equivalent path loss (or the first path loss) is determined by the network device according to the first measurement result and the N third measurement results reported by the first terminal device, and when the measurement result is the path loss, the method for determining the equivalent path loss is that

Where i in subscripts (i,3) is used to indicate path loss for a third beam direction, 3 in subscripts (i,3) is used to indicate path loss measured based on the third beam direction, and subscripts (0, 1) is used to indicate path loss measured based on the first beam direction.

Of course, the network device may also consider other factors such as cell load, interference, etc. when determining the equivalent path loss.

This step is optional.

The operations received in this step may be implemented by the controller/processor 201 and the transceiver 202 of any one of the network devices 101-102.

S404, the network device sends the power control parameter to the first terminal device, and the first terminal device receives the power control parameter sent by the network device.

Further, the network device sends the signaling through RRC signaling, MAC layer signaling, or physical layer signaling, which is not limited in the present invention.

The operation received in this step may be implemented by the transceiver 301 of any one of the terminal devices 111 to 114, or may be implemented by the modem processor 304 of any one of the terminal devices 111 to 114 together with the transceiver 301.

This step is optional.

S405, the first terminal equipment determines the side link transmitting power.

Specifically, the first terminal device determines the side link transmission power according to the power control parameter. The power control parameter comprises a power adjustment value X and/or the power control parameter comprises an equivalent path loss (or first path loss).

For example, after receiving the power adjustment value X, the first terminal device calculates the side link transmission power based on equation (2) and by adding X, see equation (3) below:

P_t＝min{P_CMAX,10log₁₀(M)+P_O+α·PL+X} (3)

wherein, P_tFor the side link transmit power, the transmit power,

wherein, P_CMAXFor maximum transmit power, M is the side link bandwidth, P_OIs a transmission power reference value or initial transmission power, alpha is a path loss compensation factor, and PL is a path loss.

As can be seen from equation (3), the edge link transmit power of the first terminal device may not exceed the maximum transmit power at maximum, i.e. the transmit power of the edge link is less than or equal to the maximum transmit power.

When calculating the PSSCH transmit power, equation (3) may be specifically:

P_PSSCH＝min{P_CMAX,PSSCH,10log₁₀(M_PSSCH)+P_{O_PSSCH,1}+α_PSSCH,1·PL+X}

further, if S402 and S403 are not present, the first terminal device determines the side link transmission power according to the first measurement result. For example, the first terminal device aligns its beam receiving direction with the direction of the sidelink, and then measures the signal quality of the downlink signal from the cellular link in this direction. The first terminal device can calculate the maximum transmitting power of the first terminal device on the side link according to the first measurement result and the receiving and transmitting power difference of the downlink on the cellular link.

For example, after the first terminal device determines the equivalent path loss, the PL is replaced by the equivalent path loss on the basis of the formula (2), so as to obtain a formula (4):

P_t＝min{P_CMAX,10log₁₀(M)+P_O+α·PL_eq} (4)

wherein, P_CMAXFor maximum transmit power, M is the side link bandwidth, P_OIs a reference value of transmission power or initial transmission power, alpha is a path loss compensation factor, PL_eqFor the equivalent path loss received from the network device, α is taken to be 1, or in equation (4), there is no α.

Further, if S402 and S403 are not present, the first terminal device determines the side link transmission power according to the first measurement result and the second measurement result. For example, the first terminal device determines a difference between the first measurement result and the second measurement result, where the power control parameter includes the difference, and superimposes the difference as the power adjustment value X in the formula (2), where the specific form is the same as that in the formula (3), and details are not described here. The result and meaning of the difference is also different for different measured quantities. Such as: when the measurement result is RSRP, since the first measurement result is usually smaller than the second measurement result based on different beam directions, according to the expression of formula (3), X should be positive, that is, based on formula (2), the side link transmission power can be increased by X dB, where X is RSRP₂-Rsrp₁. For another example, when the measurement result is a path loss, the first measurement result is usually larger than the second measurement result, so according to the expression of formula (3), X should be a positive value, and the side link transmit power can be increased by X dB appropriately, where X is the first measurement result — the second measurement result.

Further, if S402 and S403 are not included, the first terminal device determines the transmit power of the side link according to the difference between the first measurement result and the second measurement result. The specific method is described in the above paragraph, and is not described herein.

Further, if S402 and S403 are not included, the first terminal device determines the side link transmission power according to the antenna pattern of the first beam direction and the relative angle between the first beam direction and the second beam direction. For example, the first terminal device obtains the relative values of the antenna gains in the two beam directions according to the antenna pattern, and adds the relative values to the formula (2). The specific method is described in the above paragraph, and is not described herein.

Further, when the measurement quantity is the path loss, the first terminal device may further determine the first path loss value or the equivalent path loss value according to the N third measurement results (the path loss measured based on each third beam direction). Then, the terminal device obtains formula (4) based on formula (2). Alternatively, the first terminal device may determine the first path loss value or the equivalent path loss value according to the first measurement result and the N third measurement results (based on the path loss measured for each third beam direction). Then, the terminal device obtains formula (4) based on formula (2).

Wherein, P_CMAXFor maximum transmit power, M is the side link bandwidth, P_OIs a reference value of transmission power or initial transmission power, alpha is a path loss compensation factor, PL_eqFor equivalent path loss (or first path loss), PL_eqFor the second path loss value determined from the at least one measurement, α is taken to be 1, or in equation (4), α is absent.

For example, the first terminal device may take an arithmetic average of the N third measurement results, that is, sum the path loss measured based on each third beam direction, and then divide by the number of beam directions to obtain the equivalent path loss:

or the first terminal device may take an arithmetic average of the first measurement result and the N third measurement results to obtain the equivalent path loss:

the meanings of the variables are as described above and will not be described in detail.

Therefore, when calculating the psch transmit power, equation (4) may be specifically:

P_PSSCH＝min{P_CMAX,PSSCH,10log₁₀(M_PSSCH)+P_{O_PSSCH,1}+α_PSSCH,1·PL_eq} (4)

further, when the measurement quantity is the path loss, the first terminal device may further determine the first path loss or the equivalent path loss according to N third measurement results (the path loss measured based on each third beam direction), or according to the first measurement result and the N third measurement results. Then, the terminal device obtains formula (5) based on formula (3):

P_t＝min{P_CMAX,10log₁₀(M)+P_O+α·PL_eq+X} (5)

wherein, P_CMAXFor maximum transmit power, M is the side link bandwidth, P_OIs a reference value of transmission power or initial transmission power, alpha is a path loss compensation factor, PL_eqFor equivalent path loss, X is the power adjustment value.

The operation of this step can be realized by the modem processor 304 of any one of the terminal equipments 111 to 114.

Optionally, in this embodiment of the present invention, S401 and S405 may be implemented separately.

Optionally, in this embodiment of the present invention, S400, S401, and S405 may be implemented separately.

By executing the method of the embodiment of the invention, the terminal equipment or the terminal equipment and the network equipment can more accurately control the transmitting power of the side link based on the beam direction and reduce the interference to the cellular link; furthermore, the communication quality of the side link can be improved.

Optionally, the above embodiments may also be extended to a link between base stations. Specifically, the first to fourth terminal devices in the above embodiments may be replaced with first to fourth network devices, respectively. The first to fourth network devices may be a macro station and a macro station, a macro station and a small station, a small station and a small station, a main cell and a main cell, an auxiliary cell and an auxiliary cell, and a main cell and an auxiliary cell. The link between each network device is a backend (Backhaul) link. At this time, S401 and S405 in the above embodiment may be combined to be implemented separately, or S400, S401 and S405 in the above embodiment may be combined to be implemented separately. The invention is not limited.

In a 5G system, there are no cell reference signals (such as CRS). The synchronization signal ss (synchronization signal) is also transmitted in a beam manner in all directions, and the CSI-rs (channel State Information Reference signal) is also a Reference signal indicating only a specific beam direction. Therefore, for the UE, when receiving downlink Control information DCI (downlink Control information), it is necessary to know the amplitude of the symbol where the DCI information is located in advance, so that the UE can accurately adjust the Gain factor of the automatic Gain Control agc (automatic Gain Control) of the receiver, so that the demodulation of the DCI has the maximum signal-to-Noise ratio (snr).

In order to solve the above problem, an embodiment of the present invention provides a method. The method comprises the steps of configuring a reference signal RS of a QCL (Quasi-registration) Quasi-co-located with DCI to be received by a UE, and determining a transmission power deviation value between the RS and the DCI according to the type of the DCI or the stage of a connection network where the UE is located. The terminal UE determines the optimal gain control factor for receiving DCI according to the power offset and the detected signal strength of the RS, so as to achieve the best SNR of the UE receiver.

On one hand, a Downlink Control Information (DCI) sending method is provided, wherein a network device determines a power deviation between DCI and a Reference Signal (RS) according to the type of the DCI; wherein the type of the DCI comprises: a first type DCI and a second type DCI; the first type of DCI includes any one of a few: indicating DCI of system message, indicating DCI of random access response, indicating DCI of paging message; the second type of DCI includes any one of the following: a DCI indicating user-specific data, a DCI indicating a group of users common; transmitting the DCI and the reference signal.

In one possible design, the network device determining the power offset between the DCI and the RS according to the type of DCI includes: indicating a transmission power difference between the first type DCI and the RS using system information or a predefined manner, and indicating a transmission power difference between the second type DCI and the RS using a Radio Resource Control (RRC) message.

In another possible design, the determining, by the network device, the power offset between the DCI and the RS according to the type of the DCI includes: when the first type of DCI is DCI indicating a first system message, determining a transmission power difference between the DCI and the reference signal in a predefined manner; when the first type of DCI is DCI other than the first system message, indicating a transmission power difference between the DCI and the reference signal by using the first system message.

In another aspect, a method for receiving downlink control information DCI is provided, including: the terminal equipment acquires power deviation information between the downlink control information and the reference signal according to the type of the DCI; wherein the type of the DCI comprises: a first type DCI and a second type DCI; the first type of DCI includes any one of a few: indicating DCI of system message, indicating DCI of random access response, indicating DCI of paging message; the second type of DCI includes any one of the following: a DCI indicating user-specific data, a DCI indicating a group of users common; receiving the DCI.

In one possible design, the obtaining, by the terminal device, the power offset information between the DCI and the reference signal according to the type of the DCI includes: acquiring a transmission power difference between the first type DCI and the reference signal from system information or predefined information, and acquiring a transmission power difference between the second type DCI and the reference signal from a Radio Resource Control (RRC) message.

In another possible design, the obtaining, by the terminal device, the power offset information between the DCI and the reference signal according to the type of the DCI includes: when the first type of DCI is DCI indicating a first system message, acquiring a transmission power difference between the DCI and the reference signal according to a predefined mode; and when the first type of DCI is other than the DCI indicating the first system message, acquiring a transmission power difference between the DCI and the reference signal according to the first system message.

In another possible design, the terminal device receives the DCI according to the reference signal and the power offset information between the DCI and the reference signal.

In another possible design, the terminal device determines a gain control factor for receiving the DCI according to the received signal strength of the reference signal and the power offset between the DCI and the reference signal, and the terminal device receives the DCI according to the gain control factor.

In another possible design, if the terminal device does not establish the RRC connection, the terminal device obtains a transmission power difference between the first type DCI and the reference signal according to the system information or predefined information; and if the second equipment establishes RRC connection, the terminal equipment acquires the transmitting power difference between the second type DCI and the reference signal according to a Radio Resource Control (RRC) message.

In another possible design, the power offset between the DCI and the reference signal includes: and the power between the downlink DCI and the reference signal, or the power difference between the transmitting power on the subcarrier where the DCI is located and the transmitting power on the subcarrier where the reference signal is located.

In another possible design, the number of bits indicating the power deviation between the first type of DCI and the reference signal is less than the number of bits indicating the power deviation between the second type of DCI and the reference signal.

In another possible design, the reference signal is a synchronization signal or a channel state information reference signal (CSI-RS) or a Tracking Reference Signal (TRS).

In another possible design, the downlink control information common to the group of users includes any one of:

downlink control information indicating resource preemption; indicating downlink control information of a time slot format; and downlink control information indicating the power control indication information.

In another possible design, the DCI and the reference signal have a quasi-co-location relationship.

The embodiment of the invention specifically comprises the following steps:

s501, the network equipment determines the power deviation value between the transmission DCI and the reference signal RS.

Specifically, the RS may be an SS for synchronization, a CSI-RS for measurement, or a trs (tracking RS) for time synchronization. The invention is not limited thereto

Specifically, the network device determines a power offset value between the DCI and the reference signal RS according to the type of the DCI. The downlink control information DCI can be divided into two types. The first type of downlink control information includes any one of the following: indicating downlink control information of system messages, indicating downlink control information of random access response, and indicating downlink control information of paging messages. The second type downlink control information includes any one of the following: downlink control information indicating user-specific data, downlink control information indicating a group of users in common, wherein the downlink control information in common to the group of users comprises any one of: downlink control information indicating resource preemption; indicating downlink control information of a time slot format; and downlink control information indicating the power control indication information. Downlink control information common to a group of these users is sent to a group of UEs. The group of UEs may be in similar regions in spatial direction or have the same transmission characteristics. And scrambling the downlink control information by using the corresponding Radio Network Temporary Identifier (RNTI) of the different types of downlink control information. For example: downlink control information indicating resource preemption can use interrupt-RNTI (INT-RNTI) to perform CRC scrambling on DCI; the downlink control information indicating the time Slot Format can use a time Slot Format Indicator RNTI (Slot Format Indicator RNTI, SFI-RNTI) to perform CRC scrambling on the DCI; the downlink Control information indicating the Power Control indication information may use a Transmission Power Control physical Uplink Shared Channel (TPC-PUSCH-RNTI), or TPC-PUCCH-RNTI or TPC-SRS-RNTI to perform CRC scrambling on the DCI. In another example, the UE-specific downlink control information can be used for CRC scrambling of DCI by using UE-specific C-RNTI or CS-RNTI(s) or TC-RNTI or SP-CSI-RNTI.

Possible reasons for classifying DCI into two categories include: before establishing rrc (radio Resource control) connection, the UE can only receive the first type of downlink control information but cannot receive the second type of downlink control information. Another reason is that: the beam transmitting direction of the first type of downlink control information is usually broadcast or not directed to a user in a specific direction, and the beam is wider; the beam transmitting direction of the second type of downlink control information is usually multicast or unicast, which points to users in a specific direction, and the beam is narrower. The antenna gain for the transmission direction of the narrower beam is stronger and therefore the transmission power above it may be different from DCI with the wider beam direction. For these two reasons, it is necessary to indicate the power difference between the downlink control information and the reference signal to the UE from different channels according to different types of downlink control information or connection phases in which the UE is located. For example: if the UE is before RRC establishment, the UE cannot receive the power difference between the downlink control information and the reference signal through an RRC message. Conversely, after the UE establishes the RRC connection, the RRC message may be used to indicate the power difference between the downlink DCI and the RS.

It can be understood that the above RS is to have QCL relationship with DCI to be able to be used for automatic gain control adjustment by the receiver of the UE. The QCL relationships include: the transmitting beam directions of the two RSs are the same, or the same receiving beam can be used for receiving the two RSs, or one or more of the channel parameters of the two RSs are determined to be the same. The physical significance of the method is as follows: the DCI and the RS are transmitted from the same or similar spatial direction or experience the same or similar spatial transmission channel, so that the DCI and the RS do not affect the UE to see them as signals transmitted from the same direction equivalently.

The operations of this step are performed by the controller/processor 201 of any one of the network devices 101-102.

S502, the network equipment sends the DCI and RS power difference information to the terminal equipment. The terminal device receives power difference information between the DCI and the RS from the network device.

Specifically, the network device notifies the power difference information between the DCI of the first type and the RS through a System information block 1 (SIB 1). The power difference information between the DCI transmitted by the SIB1 and the RS may be determined in a protocol predefined manner, and accordingly, the terminal device determines the optimal gain control factor for receiving the DCI using the protocol predefined power difference information.

Further, when SIB1 also indicates the power difference between DCI and RS, predefined information is covered using the information in SIB 1. That is, the UE determines the power difference between the DCI indicating the SIB1 and the RS or determines the power difference between the DCI indicating the first type DCI and the RS with reference to the indication information in the SIB 1.

Optionally, the power difference between the Downlink DCI and the RS may be defined based on the transmission power of a symbol where a physical Downlink Control channel (pdcch) of the DCI is located and the transmission power of a symbol where the RS is located, or may be defined by using the power difference between the transmission power of a subcarrier where the Downlink DCI is located and the transmission power of a subcarrier where the RS is located. The invention is not limited in this regard. In general, because the bandwidth between the RS and the DCI is different, the number of bits used may be defined using the power difference over the subcarriers.

Further, the network device notifies the power difference information between the second type DCI and the RS through a dedicated RRC message.

Because the beam width occupied by the first type of DCI is wider than that occupied by the second type of DCI, the power difference between the first type of control information and the RS is smaller. Fewer bits can be used to indicate the power difference between the first type DCI and the RS, thereby achieving the purpose of reducing air interface signaling. Further, since the power difference between the first type DCI and the RS is indicated in the system message, it is also important to reduce overhead of the system message in terms of transmission efficiency of the network, and thus fewer bits may be used to indicate the power difference between the first type DCI and the RS.

S503, the terminal equipment determines the power control factor of the received DCI and receives the DCI. Specifically, the terminal device determines a gain control factor for receiving the downlink DCI according to the received signal strength of the reference signal, the DCI type, and the power deviation between the downlink DCI and the RS, and receives the DCI according to the gain control factor. For example, the UE receives the RS first, the fluctuation range of the obtained signal power range is [ -50, -80] dBm, and the DCI power is 5dB higher than the RS, so the UE can know that the fluctuation range of the downlink DCI signal is [ -45, -75] dBm. The UE can thus determine a gain factor for the proper AGC for the reception of DCI, so as to obtain a quantized value after Analog-to-Digital Converter ADC (Analog-to-Digital Converter) of the good DCI, thereby obtaining the best received SNR of the DCI. On the contrary, if the UE does not know the power difference between the downlink DCI and the RS, the UE may set an incorrect gain factor of the AGC, thereby causing a decrease in the received SNR. As in the above example, if the gain range of the received DCI is still tuned to the same [ -50, -80] dBm as that of the received RS, the signal of the DCI of the signal quantized by the ADC will be lost 5dB from the actual signal. This is a need to be avoided and circumvented as much as possible in wireless communication systems.

The operation received in this step may be implemented by the modem processor 304 of any one of the terminal devices 111 to 114, or may be implemented by the modem processor 304 of any one of the terminal devices 111 to 114 together with the transceiver 301.

By the method, the terminal equipment can better receive the DCIs of different types according to the more accurate determination of the gain control factors of the first DCI and the second DCI. Meanwhile, the system signaling overhead can be effectively reduced.

The present examples also provide an apparatus (e.g., an integrated circuit, a wireless device, a circuit module, etc.) for implementing the above-described method. An apparatus implementing the power tracker and/or the power supply generator described herein may be a standalone device or may be part of a larger device. The device may be (i) a free-standing IC; (ii) a set of one or more 1C, which may include a memory IC for storing data and/or instructions; (iii) RFICs, such as RF receivers or RF transmitter/receivers; (iv) an ASIC, such as a mobile station modem; (v) a module that may be embedded within other devices; (vi) a receiver, cellular telephone, wireless device, handset, or mobile unit; (vii) others, and so forth.

The method and the device provided by the embodiment of the invention can be applied to terminal equipment or access network equipment (which can be collectively referred to as wireless equipment). The end device or access network device or wireless device may include a hardware layer, an operating system layer that runs above the hardware layer, and an application layer that runs above the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processing through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. In the embodiment of the present invention, the specific structure of the execution main body of the method is not limited in the embodiment of the present invention, as long as the communication can be performed by the method for transmitting a signal according to the embodiment of the present invention by running a program in which a code of the method of the embodiment of the present invention is recorded, for example, the execution main body of the method for wireless communication of the embodiment of the present invention may be a terminal device or an access network device, or a functional module capable of calling the program and executing the program in the terminal device or the access network device.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. 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 embodiments.

Moreover, various aspects or features of embodiments of the invention may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips, etc.), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), card, stick, or key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

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. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. 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 in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, 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.). 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 incorporates one or more of the available media. 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.

It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

It is clear to those skilled in the art that, for convenience and brevity 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 above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized 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. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, 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 place, 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.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented as or make a contribution to the prior art, or may be implemented as a software product, which is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or an access network device) to execute all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only a specific implementation of the embodiments of the present invention, but the scope of the embodiments of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the embodiments of the present invention, and all such changes or substitutions should be covered by the scope of the embodiments of the present invention.

Claims

1. A method of determining transmit power, comprising:

a first terminal device determines a power control parameter, wherein the power control parameter is determined based on a first beam direction, the first beam direction is a beam direction used by the first terminal device on a side link, and the side link is a communication link between the first terminal device and a second terminal device;

the first terminal equipment determines the transmitting power of the side link according to the power control parameter;

the first terminal device measures a signal sent by the network device based on the first beam direction to obtain a first measurement result;

the first terminal device determining the power control parameter includes:

and the first terminal equipment determines the power control parameter according to the first measurement result.

2. The method of claim 1, further comprising:

the first terminal device measures a signal sent by the network device based on a second beam direction, and obtains a second measurement result, wherein the second beam direction is a beam direction used by the first terminal device on a cellular link, and the cellular link is a communication link between the first terminal device and the network device;

the determining the power control parameter according to the first measurement result includes:

the determining the power control parameter according to the first measurement result and the second measurement result.

3. The method of claim 2, wherein the first terminal device determines the power control parameter according to the first measurement result and the second measurement result, comprising:

the first terminal device determining a difference between the first measurement result and the second measurement result, wherein the power control parameter comprises the difference;

and the first terminal equipment determines the power control parameter according to the difference value.

4. The method of claim 1, further comprising:

the first terminal device measures a signal sent by the network device based on N third beam directions, and obtains N third measurement results, where each of the N third beam directions is a beam direction used on a communication link between the first terminal device and one of at least N other terminal devices, and N is an integer greater than or equal to 1;

and the first terminal equipment determines the power control parameter according to the first measurement result and the N third measurement results.

5. The method of claim 4, wherein the first terminal device determines the power control parameter according to the first measurement result and the N third measurement results, and comprises:

the first terminal device determining an average of the first measurement and the N third measurements, wherein the power control parameter comprises the average;

and the first terminal equipment determines the power control parameter according to the average value.

6. The method according to any of claims 1-5, wherein the determining of the transmission power by the first terminal device based on the power control parameter comprises:

and the first terminal equipment determines the transmission power according to the maximum transmission power and the power control parameter, wherein the transmission power is less than or equal to the maximum transmission power.

7. The method of any of claims 1 to 5, further comprising:

the first terminal equipment receives radio resource configuration information sent by the network equipment, wherein the radio resource configuration information comprises at least one radio resource; and

the first terminal device determining the transmission power of the side link includes: the first terminal device determining the transmission power on the at least one radio resource according to the power control parameter;

and/or the presence of a gas in the gas,

the first terminal equipment receives subcarrier interval configuration information sent by the network equipment, wherein the subcarrier interval configuration information comprises at least one subcarrier interval; and

the first terminal device determining the transmission power of the side link includes: the first terminal device determines the transmission power on at least one first radio resource applying any one of the at least one subcarrier spacing according to the power control parameter.

8. A method of determining a power control parameter, comprising:

the method comprises the steps that a network device obtains a first measurement result, wherein the first measurement result is obtained by measuring a signal sent by the network device based on a first beam direction, the first beam direction is a beam direction used by a first terminal device on a side link, and the side link is a communication link between the first terminal device and a second terminal device;

and the network equipment determines a power control parameter according to the first measurement result, wherein the power control parameter is used for determining the side link transmitting power by the first terminal equipment.

9. The method of claim 8, further comprising:

obtaining, by the network device, a second measurement result, where the second measurement result is obtained by measuring a signal transmitted by the network device based on a second beam direction, where the second beam direction is a beam direction used by the first terminal device on a cellular link, and the cellular link is a communication link between the first terminal device and the network device;

the network device determines a power control parameter according to the first measurement result, including:

the network device determines the power control parameter according to the first measurement result and the second measurement result.

10. The method of claim 8, further comprising:

the network device obtains N third measurement results, where the N third measurement results are obtained by measuring a signal transmitted by the network device based on N third beam directions, where each of the N third beam directions is a beam direction used on a communication link between the first terminal device and one of at least N other terminal devices, and N is an integer greater than or equal to 1;

the network device determines the power control parameter according to the first measurement result and the N third measurement results.

11. The method of claim 9, wherein the network device determining the power control parameter based on the first measurement and the second measurement comprises:

the network device determining a difference between the first measurement and the second measurement, wherein the power control parameter comprises the difference;

and the network equipment determines the power control parameter according to the difference value.

12. The method of claim 10, wherein the network device determines the power control parameter according to the first measurement result and the N third measurement results, comprising:

the network device determining an average of the first measurement and the N third measurements, wherein the power control parameter comprises the average;

the network device determines the power control parameter based on the average.

13. The method according to any one of claims 8-12, further comprising:

the network device sends radio resource configuration information to the first terminal device, wherein the radio resource configuration information includes at least one radio resource, and the at least one radio resource is used for the first terminal device to determine the transmission power on the at least one radio resource according to the power control parameter;

and/or the presence of a gas in the gas,

the network device sends subcarrier spacing configuration information to the first terminal device, where the subcarrier spacing configuration information includes at least one subcarrier spacing, and the at least one subcarrier spacing is used for the first terminal device to determine the transmission power on at least one first radio resource according to the power control parameter, where the at least one first radio resource applies any one subcarrier spacing in the at least one subcarrier spacing;

and/or the presence of a gas in the gas,

and the network equipment sends the power control parameter to the terminal equipment.

14. A wireless apparatus, comprising: a processor and a memory coupled to the processor, wherein,

the processor is configured to determine a power control parameter, where the power control parameter is determined based on a first beam direction, where the first beam direction is a beam direction used by a first terminal device on a side link, and the side link is a communication link between the first terminal device and a second terminal device;

the processor is further configured to determine a transmit power of the side link according to the power control parameter;

the processor is configured to obtain a first measurement result based on a signal sent by the first beam direction measurement network device;

the processor is further configured to determine the power control parameter based on the first measurement.

15. The wireless device of claim 14,

the processor is configured to measure a signal sent by the network device based on a second beam direction, and obtain a second measurement result, where the second beam direction is a beam direction used by the first terminal device on a cellular link, and the cellular link is a communication link between the first terminal device and the network device;

the processor is further configured to determine the power control parameter based on the first measurement and the second measurement.

16. The wireless device of claim 14,

the processor is configured to measure a signal sent by the network device based on N third beam directions, and obtain N third measurement results, where each of the N third beam directions is a beam direction used on a communication link between the first terminal device and at least one of N other terminal devices;

the processor is further configured to determine the power control parameter based on the first measurement and at least one of the N third measurements.

17. The wireless device of claim 15,

the processor is configured to determine a difference between the first measurement and the second measurement, wherein the power control parameter comprises the difference;

the processor is further configured to determine the power control parameter based on the difference.

18. The wireless device of claim 16,

the processor is configured to determine an average of the first measurement and the N third measurements, wherein the power control parameter comprises the average;

the processor is further configured to determine the power control parameter based on the average.

19. The wireless device of any of claims 14 to 18,

the processor is configured to determine the transmit power according to a maximum transmit power and the power control parameter, where the transmit power is less than or equal to the maximum transmit power.

20. The wireless device of any of claims 14 to 18, further comprising: a transceiver, wherein the transceiver is capable of, among other things,

the transceiver is configured to receive radio resource configuration information sent by the network device, where the radio resource configuration information includes at least one radio resource;

the processor is further configured to determine the transmit power on the at least one radio resource based on the power control parameter;

and/or the presence of a gas in the gas,

the transceiver is configured to receive subcarrier spacing configuration information sent by the network device, where the subcarrier spacing configuration information includes at least one subcarrier spacing;

the processor is further configured to determine the transmit power on at least one first radio resource applying any one of the at least one subcarrier spacing according to the power control parameter.

21. A wireless device, characterized by a processor, and a memory coupled to the processor, wherein,

the processor is configured to obtain a first measurement result, where the first measurement result is obtained by measuring a signal transmitted by a network device based on a first beam direction, where the first beam direction is a beam direction used by a first terminal device on a side link, and the side link is a communication link between the first terminal device and a second terminal device;

the processor is further configured to determine a power control parameter according to the first measurement result, where the power control parameter is used by the first terminal device to determine the transmit power of the side link.

22. The wireless device of claim 21,

the processor is configured to obtain a second measurement result, where the second measurement result is obtained by measuring a signal transmitted by the network device based on a second beam direction, where the second beam direction is a beam direction used by the first terminal device on a cellular link, and the cellular link is a communication link between the first terminal device and the network device;

23. The wireless device of claim 21,

the processor is configured to obtain N third measurement results, where the N third measurement results are obtained by the first terminal device measuring signals transmitted by the network device based on N third beam directions, where each of the N third beam directions is a beam direction used on a communication link between the first terminal device and one of at least N other terminal devices;

the processor is further configured to determine the power control parameter based on the first measurement and the N third measurements.

24. The wireless device of claim 22,

25. The wireless device of claim 23,

the processor is configured to determine an average of the first measurement and at least one of the N third measurements, wherein the power control parameter comprises the average;

26. The wireless device of any of claims 21-25, further comprising: a transceiver, wherein the transceiver is capable of, among other things,

the transceiver is configured to send radio resource configuration information to the first terminal device, where the radio resource configuration information includes at least one radio resource, and the at least one radio resource is used by the first terminal device to determine, according to the power control parameter, the transmission power on the at least one radio resource;

and/or the presence of a gas in the gas,

the transceiver is configured to send subcarrier spacing configuration information to the first terminal device, where the subcarrier spacing configuration information includes at least one subcarrier spacing, and the at least one subcarrier spacing is used for the first terminal device to determine the transmit power on at least one first radio resource according to the power control parameter, where the at least one first radio resource applies any one of the at least one subcarrier spacing;

and/or the presence of a gas in the gas,

the transceiver is configured to send the power control parameter to the terminal device.

27. A computer storage medium, comprising:

computer software instructions for storing said first terminal device, comprising program instructions designed for carrying out the method of any one of claims 1 to 7.

28. A computer storage medium, comprising:

computer software instructions for storing said network device, comprising program instructions designed for carrying out the method of any one of claims 8 to 13.

29. A communications apparatus, comprising:

a processor and a memory coupled to the processor, the memory for storing instructions, the processor for reading and executing the instructions in the memory to control the communication device to perform the method of any of claims 1 to 13.