CN114845371A

CN114845371A - Method, device and equipment for controlling power of side link control channel and readable storage medium

Info

Publication number: CN114845371A
Application number: CN202110135950.5A
Authority: CN
Inventors: 张静文; 王飞
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2021-02-01
Filing date: 2021-02-01
Publication date: 2022-08-02

Abstract

The embodiment of the application provides a method, a device, equipment and a readable storage medium for controlling the power of an edge link control channel, wherein the method comprises the following steps: acquiring the RB number of PSSCH transmission opportunities of a second terminal, wherein the resource blocks of the PSSCH transmission opportunities are indicated by the associated first SCI format; determining the transmission power of the PSCCH transmitted by the first terminal according to the RB number of the PSSCH transmission opportunity of the second terminal, or determining the transmission power of the PSCCH transmitted by the first terminal according to the measured RSRP measurement value; the RSRP measurement value is obtained based on received PSSCH of the second terminal or DMRS resource measurement of PSCCH. In the embodiment of the application, the transmission power of the PSCCH can be determined under the condition that the receiving node forwards the zero-power PSCCH, and meanwhile, the interference of the forwarded PSCCH on the surrounding nodes is avoided as much as possible.

Description

Method, device and equipment for controlling power of side link control channel and readable storage medium

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a method, a device, equipment and a readable storage medium for controlling the power of a side link control channel.

Background

According to a Physical side link Control Channel (PSCCH) and Physical side link Shared Channel (PSSCH) power Control scheme of the existing protocol, a transmitting node firstly determines the transmitting power of the PSSCH, and then determines the transmitting power of the PSCCH according to the proportion of Physical Resource Blocks (PRBs) occupied by the PSCCH and the PSSCH.

In the above-mentioned coordination scheme for the transmitting and receiving nodes, since the receiving node forwards the zero-power PSCCH, the transmission power of the corresponding PSCCH cannot be determined according to the existing scheme.

Disclosure of Invention

Embodiments of the present application provide a method, an apparatus, a device, and a readable storage medium for controlling side link control channel power, which solve the problem of how to determine the transmit power of a PSCCH.

In a first aspect, a method for controlling power of an sidelink control channel, performed by a first terminal, includes:

determining an RB of a PSSCH transmission opportunity of the second terminal; wherein the RB of the PSSCH transmission opportunity is indicated by its associated first SCI format;

determining the transmission power of a physical side link control channel (PSCCH) transmitted by the first terminal according to the RB number of the PSSCH transmission opportunity of the second terminal;

or, determining the transmission power of the PSCCH transmitted by the first terminal according to the measured RSRP measurement value; the RSRP measurement value is obtained based on received demodulation reference signal DMRS resource measurement of PSSCH or PSCCH of the second terminal.

Optionally, the determining, according to the number of RBs of the PSCCH transmission opportunity of the second terminal, the transmission power of the PSCCH transmitted by the first terminal includes:

and determining the PSCCH transmission power of the first terminal according to the RB number of the PSCCH transmission opportunity of the first terminal, the RB number of the PSSCH transmission opportunity of the second terminal and the virtual PSSCH transmission power calculated by the first terminal according to the RB number of the PSSCH transmission opportunity of the second terminal.

Optionally, the determining the transmission power of the PSCCH of the first terminal according to the number of RBs of the PSCCH transmission opportunity of the first terminal, the number of RBs of the PSCCH transmission opportunity of the second terminal, and the transmission power of the virtual PSCCH calculated by the first terminal according to the number of RBs of the PSCCH transmission opportunity of the second terminal includes:

determining the transmission power of the PSCCH of the first terminal by the following formula;

wherein, P _PSCCH,proxy Represents a transmit power of a PSCCH of the first terminal;

a number of RBs that are PSCCH transmission opportunities for the first terminal;

number of RBs of psch transmission opportunity for the second terminal; p _{PSSCH,virtual} The transmission power of the virtual PSSCH is calculated for the first terminal based on the number of RBs of the PSSCH transmission opportunity of the second terminal.

Optionally, the determining, according to the measured RSRP measurement value, the transmission power of the PSCCH transmitted by the first terminal includes:

determining the sending power of the PSCCH of the first terminal according to the measured RSRP value and the side link path loss between the first terminal and the third terminal; the edge link path loss is sent by the third terminal to the first terminal.

Optionally, the determining the transmit power of the PSCCH of the first terminal according to the measured RSRP measurement value and the side link path loss between the first terminal and the third terminal includes:

P _PSCCH,proxy ＝min(P _CMAX ,P _MAX,CBR,v ,RSRP _hidden +PL _SL )

wherein, P _PSCCH,proxy Represents a transmit power of a PSCCH of the first terminal; RSRP _hidden A measured RSRP value measured for a DMRS resource based on the received psch or PSCCH of the second terminal; PL _SL Edge link path loss for the third terminal to send to the first terminal.

Optionally, the lowest subchannel transmitted by the psch of the first terminal is the subchannel transmitted by the PSCCH of the first terminal on the uppermost RB;

or, the uppermost subchannel of the PSCCH transmission of the first terminal is the subchannel of the PSCCH transmitted on the uppermost RB associated with the PSCCH of the first terminal.

In a second aspect, a resource selection method is provided, which is performed by a third terminal, and includes:

acquiring a first RSRP threshold value; when the reference signal received power PSCCH-RSRP of the side link control channel sent by a first terminal is higher than a first RSRP threshold corresponding to a priority group, excluding reserved resources corresponding to the PSCCH sent by the first terminal;

wherein the priority group comprises a first priority and a second priority, and the first priority is the priority indicated by the priority domain in the PSCCH sent by the first terminal; the second priority is a transmission priority of the third terminal.

Optionally, the method further comprises:

acquiring a second RSRP threshold value;

and executing the existing resource exclusion process according to the second RSRP threshold value.

In a third aspect, an apparatus for controlling side link control channel power includes:

a first determining module for determining an RB of a psch transmission opportunity for a second terminal; wherein the RB of the PSSCH transmission opportunity is indicated by its associated first SCI format;

a second determining module, configured to determine, according to the number of RBs of the PSCCH transmission opportunity of the second terminal, a transmission power of a PSCCH transmitted by the first terminal;

or, a third determining module, configured to determine, according to the measured RSRP measurement value, a transmission power of a PSCCH sent by the first terminal; the RSRP measurement value is obtained based on received demodulation reference signal (DMRS) resource measurement of PSSCH or PSCCH of the second terminal.

In a fourth aspect, a resource selection apparatus is provided, including:

the first acquisition module is used for acquiring a first RSRP threshold value;

a fifth determining module, configured to, when the PSCCH-RSRP sent by the first terminal is higher than a first RSRP threshold corresponding to the priority group, exclude a reserved resource corresponding to the PSCCH sent by the first terminal;

wherein the priority group includes a first priority and a second priority, and the first priority is a priority in the PSCCH transmitted by the first terminal.

In a fifth aspect, a communication device is provided, comprising: a processor, a memory and a program stored on the memory and executable on the processor, which when executed by the processor, performs the steps of the method according to the first or second aspect.

A sixth aspect provides a readable storage medium having a program stored thereon, which when executed by a processor implements steps comprising a method according to the first or second aspect.

In the embodiment of the application, the first terminal can determine the transmission power of the PSCCH, and the transmission power of the PSCCH can be determined even if the first terminal forwards the zero-power PSSCH, so that the interference of the behavior of transmitting the PSCCH on surrounding nodes is avoided.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a diagram illustrating a conventional resource allocation scheme;

fig. 2 is a schematic diagram of a second terminal;

FIG. 3 is a flow chart of a method for side link control channel power control in an embodiment of the present application;

fig. 4 is a schematic diagram of a frequency domain transmission position of a conventional PSCCH;

fig. 5a and 5b are schematic diagrams of frequency domain transmission positions of PSCCHs according to an embodiment of the present application;

FIG. 6 is a flow chart of a resource selection method in an embodiment of the present application;

FIG. 7 is a diagram of an apparatus for side link control channel power control in an embodiment of the present application;

FIG. 8 is a diagram of a resource selection apparatus in an embodiment of the present application;

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

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it should be understood that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive effort, shall fall within the scope of protection of the present application.

The terms "comprises," "comprising," or any other variation thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the use of "and/or" in the specification and claims means that at least one of the connected objects, such as a and/or B, means that three cases, a alone, B alone, and both a and B, exist.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

It is noted that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE)/LTE Evolution (LTE-Advanced) systems, but may also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably in embodiments of the present application, and the described techniques may be used in both the above-mentioned systems and radio technologies, as well as in other systems and radio technologies. However, the following description describes a New Radio (NR) system for purposes of example, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications, such as 6th Generation (6G) communication systems.

Herein, a terminal may also be referred to as a terminal Device or a User Equipment (UE), where the terminal may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer) or a notebook Computer, a Personal Digital Assistant (PDA), a palm top Computer, a netbook, a super-Mobile Personal Computer (UMPC), a Mobile Internet Device (MID), a Wearable Device (Wearable Device) or a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), and other terminal-side devices, and the Wearable Device includes: bracelets, earphones, glasses and the like. It should be noted that the embodiment of the present application does not limit the specific type of the terminal.

The network-side device may be a Base Station or a core network, where the Base Station may be referred to as a node B, an evolved node B, an access Point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access Point, a WiFi node, a Transmit Receiving Point (TRP), or some other suitable term in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, and it should be noted that, in the embodiment of the present application, only the Base Station in the NR system is taken as an example, but a specific type of the Base Station is not limited.

In order to facilitate understanding of the embodiments of the present application, the following technical points are introduced below:

first, New Radio (NR) Vehicle to aircraft (V2X) mode 2(mode-2) resource allocation:

NR V2X supports two resource allocation approaches: mode 1(Mode-1) resource allocation Mode and Mode-2 resource allocation Mode, where Mode-1 is a base station controlled resource allocation Mode and Mode-2 is a terminal autonomous resource allocation Mode. The Mode-2 resource selection Mode is "listen before send", and determines the resource to be selected in the resource selection window (selection window) based on the sensing of the resource in the sensing window (sensing window), see fig. 1, and the basic operation process is as follows:

(1) resource selection window and perception window determination: if resource selection is triggered at time n, then the resource selection window is [ n + T ] ₁ ，n+T ₂ ]The sensing window is [ n-T ] ₀ ，n-T _pro,0 ]；

T ₁ Parameters selected for the terminal based on implementation and satisfying 0<＝T ₁ <＝T _proc,1 ，T _proc,1 For maximum transceive delay, for 15/30/60/120kHSub-carrier spacing of z, T _proc,1 Are 3/5/9/17 time slots respectively.

T ₂ The parameters selected for the terminal based on the implementation are the values and the high-level parameters T _2,min And remaining packet delay budget. In particular, if T _2,min <remainning PDB, then T ₂ The value of (a) should satisfy T _2,min <＝T ₂ <Remainning PDB; otherwise, T ₂ ＝remaining PDB。

T ₀ For the parameter of the sensing window, per resource pool (pre) is configured, and the value is 1100ms or 100 ms.

T _pro,0 For terminal processing delay, T is the subcarrier spacing of 15/30/60/120kHz _pro,0 Are 1/1/2/4 time slots respectively.

(2) A Sensing process: namely, demodulating a Physical side link Control Channel (PSCCH) sent by other terminals in a sensing window, and collecting Reference Signal Received Power (RSRP) information;

(3) and (3) resource elimination process:

v2x is half duplex and cannot monitor in its own transmission time slot, so it can only be assumed that other UEs in the time slot reserve resources one or more times with all possible periods configured by the system, and when the candidate resources in the resource selection window or the periodically reserved resources after the candidate resources overlap, the resources are excluded;

decoding occupied resources and subsequent one/multiple reserved resources indicated by side link Control Information (SCI), overlapping with candidate resources in a resource selection window or the one/multiple reserved resources after the candidate resources, and excluding the resources when RSRP is higher than a certain threshold;

(4) if the residual resources are less than X% of the full set, the RSRP threshold value is improved by 3dB, and the resource exclusion step (3) is repeated;

(5) the available resources are reported to a Medium Access Control (MAC) layer, which performs random selection.

Second, the content of the first-stage (1st stage) side link Control Information (SCI) (carried in PSCCH):

priority (Priority): indicating priority information of a corresponding PSSCH;

time resource allocation (Time resource assignment): when the high layer configuration parameter sl-MaxNumPerReserve is 2, 5 bits of information are needed, and when the configuration is 3, 9 bits of information are needed. The Time domain position of the first PSSCH, namely the Time slot where the SCI is located, and the Time domain position of the second Time and/or the third Time is/are indicated by Time resource assignment;

frequency resource allocation (Frequency resource allocation): the starting (starting) sub-channel (subchannel) of the first PSSCH is the subchannel where the SCI is located, and the Frequency resource assignment can indicate the starting subchannel of the second PSSCH and/or the third PSSCH and the number of the subchannels occupied by each PSSCH;

resource reservation period (Resource reservation period): and (4) resource reservation period.

Others …

It can be seen that the procedures of V2X resource selection (including sending, resource exclusion, etc.) are all performed by the sending end, and the selected resource is a resource with less interference from the perspective of the sending end. The communication distance between the transmitting end and the receiving end of V2X is about 2.5 times of the moving speed, which can reach the level of hundred meters, and due to the complexity of the surrounding environment, the resource usage seen by the receiving end and the transmitting end has a large difference, that is, there is a problem of hidden nodes (hidden nodes) as shown in fig. 2:

if the sending resource is determined only from the perspective of the sending end, it is easy to cause the problems that the receiving end is relatively seriously interfered on the selected sending resource, resulting in low signal to interference noise ratio (SINR), and incorrect data demodulation.

Referring to fig. 3, an embodiment of the present application provides a method for controlling power of an edge link control channel, which is performed by a first terminal (alternatively referred to as a first node, a receiving node, or the like), and includes the following specific steps: step 301, step 302 and step 303.

Step 301: determining the number of RBs of PSSCH transmission opportunities for a second terminal (alternatively referred to as a second node, a transmitting node, a hidden node, etc.); wherein the RB of the PSSCH transmission opportunity is indicated by its associated first side link control information format (SCI format);

it can be understood that the RB of the psch transmission opportunity is composed of consecutive N subchannels (subchannels), and the unit of sidelink frequency domain scheduling is subchannel.

Step 302: determining the transmission power of the PSCCH transmitted by the first terminal according to the RB number of the PSSCH transmission opportunity of the second terminal;

step 303: determining a transmission Power of a PSCCH transmitted by the first terminal according to a measured Reference Signal Receiving Power (RSRP) measurement value; the RSRP measurement value is obtained based on a received demodulation Reference Signal (DMRS) resource measurement of the psch or PSCCH of the second terminal.

It is understood that

steps

301 and 302, and step 303 are two methods for determining the transmission power, and the manner in which the first terminal selects to determine the transmission power may be indicated by one or more of the following manners: resource pool (pre) configuration, high-level signaling indication, physical layer channel indication.

The reserved resource of the second terminal can be perceived or excluded by the first terminal but cannot be perceived or excluded by the third terminal; when the first terminal and the third terminal perform side link communication, the first terminal is a receiving node, and the third node is a sending terminal.

In this embodiment of the present application, the determining the transmission power of the PSCCH of the first terminal according to the number of PRBs occupied by the PSCCH of the second terminal includes:

In the embodiment of the application, the transmission power of the PSCCH of the first terminal is determined by the following formula;

wherein, P _PSCCH,proxy (i) Represents a transmit power of a PSCCH of the first terminal;

number of RBs of psch transmission opportunity for the second terminal; p _{PSSCH,virtual} (i) I is a positive integer, and is the transmission power of the virtual PSSCH calculated by the first terminal from the number of RBs in the PSSCH transmission opportunity of the second terminal.

In the examples of this application, P _{PSSCH,virtual} (i) Can be calculated by the following formula.

P _{PSSCH,virtual} (i)＝min(P _CMAX ,P _MAX,CBR,v ,min(P _PSSCH,D,v (i),P _PSSCH,SL,v (i)))

[dBm]

Wherein, P _PSSCH,D,v (i) Refers to the transmission power of the virtual pscch determined by using a Downlink (DL) Reference Signal (RS). Specifically, the sidelink terminal measures the DL RS to obtain the path loss (pathloss), and obtains the transmission power of the pscch.

The purpose of determining the transmission power of the psch by using the DL RS is to avoid causing large interference to an Uplink (UL) link of a Uu port (i.e., a New Radio (NR) air interface) as much as possible.

P _PSSCH,SL,v (i) Refers to the transmit power of the virtual pscch determined using sidelink RS. For example, whether DL RS or SL RS is used to determine the transmission power of the virtual pschs may be configured by sidelink higher layer parameters;

P _CMAX is the maximum transmission power of the sidelink terminalThe transmission power of the PSSCH determined based on the DL RS or the SL RS cannot exceed the limit of the maximum transmission power of the sidelink terminal;

P _MAX,CBR,v is a power control parameter configured by a higher layer, and is related to the priority of data carried by the psch and the congestion condition of a current resource pool (resource pool).

P is above _CMAX ,P _MAX,CBR,v ，P _PSSCH,D,v (i)，(P _PSSCH,D,v (i),P _PSSCH,SL,v (i) Etc.) may be configured by higher layer parameters for the PSCCH forwarded by the first terminal.

In this embodiment of the present application, the determining, according to the measured RSRP measurement value, the transmission power of the PSCCH sent by the first terminal includes:

The main idea of the scheme is that at the side of the sending node, the measured RSRP of the control channel forwarded by the receiving node is equivalent to the RSRP of the control channel or the data channel of the hidden node measured by the receiving node.

Specifically, the receiving node senses the PSCCH of the hidden node, and obtains an RSRP measurement value according to a DMRS resource of the PSCCH or the PSCCH of the hidden node according to an RSRP measurement mode (pre) configured by a resource pool, and sets the RSRP measurement value as RSRP _ atRx; when the receiving node forwards the PSCCH, the RSRP measurement value of the PSCCH measured by the sending node is set as RSRP _ atTx; when the receiving node transmits the PSCCH, the transmitting power determined by the receiving node should be such that, after the path loss between the receiving node and the transmitting node, the RSRP _ atTx is approximately equal to RSRP _ atRx, and therefore, the transmitting power of the PSCCH of the receiving node is:

P _PSCCH,proxy ＝min(P _CMAX ,P _MAX,CBR,v ,RSRP _hidden +PL _SL )

wherein, P _PSCCH,proxy Representing said first terminal (receiving node)The transmit power of the PSCCH; RSRP _hidden An RSRP measurement value measured for a DMRS resource based on the received psch or PSCCH of the second terminal (hidden node); PL _SL Is the edge link path loss transmitted by the third terminal (transmitting node) to the first terminal (receiving node).

The scheme is suitable for a communication mode that a sending node and a receiving node are unicast or multicast, and path loss is measured based on sidelink configuration at the sending node. In the existing protocol, a transmitting node obtains the path loss according to the following formula: PL _SL The receiver comprises a receiver, a transmitter node and a receiver, wherein the receiver is configured to obtain a reference signal-receiver-layer filtered RSRP, wherein the reference signal-receiver is obtained by the transmitter node according to an antenna port and an RE number occupied by a PSSCH (that is, a power spectral density is multiplied by an occupied RE number); the high layer filtered RSRP is an RSRP measured value obtained by a receiving node measuring PSSCH sent by a sending node; further, the receiving node sends the measured value to the sending node, and the sending node subtracts the RSRP from the sending power to obtain the path loss. In this scheme, the transmitting node is required to retransmit the calculated path loss back to the receiving node.

In the scheme, as the RSRP of the PSCCH forwarded by the receiving node and received by the sending node is equivalent to the RSRP of the PSCCH/PSSCH of the hidden node and received by the receiving node, the RSRP threshold of another priority group is not required to be additionally defined, and the existing configuration threshold is directly multiplexed, so that the resource exclusion can be carried out.

In this embodiment of the present application, the lowest subchannel transmitted by the psch of the first terminal is the subchannel of the PSCCH transmitted by the first terminal, which is sent on the uppermost RB; or, the uppermost subchannel of the PSCCH transmission of the first terminal is the subchannel of the PSCCH transmitted by the first terminal on the uppermost RB.

Referring to fig. 4-5 a and 5b, fig. 4 illustrates an existing PSCCH transmission position. According to the current protocol, the frequency domain transmission position of the PSCCH is counted up by taking the lowest RB in subchannel which is the lowest frequency domain position occupied by the corresponding PSCCH as the starting position. At this time, when the receiving node occupies the frequency domain resource according to the same rule to forward the PSCCH, it will bring large interference to surrounding nodes that occupy the same/overlapped transmission resource.

In fig. 5a, the PSCCH frequency domain resource takes the uppermost RB in the subchannel at the lowest frequency domain position occupied by the psch as the starting position, and in fig. 5b, the uppermost RB in the subchannel at the highest frequency domain position occupied by the psch as the starting position. The number of RBs in the next number, that is, the number of RBs of the PSCCH transmission opportunity, is pre-configured for each resource pool (per resource pool).

Referring to fig. 6, an embodiment of the present application provides a transmission method, which is executed by a third terminal (or referred to as a sending node), and includes the specific steps of: step 601 and step 602.

Step 601: acquiring a first RSRP threshold value;

step 602: when PSCCH-RSRP sent by a first terminal is higher than a first RSRP threshold corresponding to a priority group, excluding reserved resources corresponding to the PSCCH sent by the first terminal;

wherein the priority group comprises a first priority and a second priority, and the first priority is the priority indicated by the priority domain in the PSCCH sent by the first terminal; the second priority is a transmission priority of a third terminal.

In an embodiment of the present application, the method further includes: acquiring a second RSRP threshold value; and executing the existing resource exclusion process according to the second RSRP threshold value.

Since the first terminal (receiving node) is the transmission power of the PSCCH determined by the RB number of the PSCCH transmission opportunity of the second terminal (e.g., hidden node), and the distance between the second terminal and the first terminal is farther away than the distance between the first terminal and the transmitting node, the RSRP of the PSCCH forwarded by the transmitting node sending to the first terminal is lower than the RSRP of the PSCCH of the second terminal sent by the first terminal sending to the second terminal. In order to ensure that the sending node can exclude the reserved resources corresponding to the PSCCH forwarded by the first terminal, two sets of RSRP threshold values between different priorities need to be defined, one RSRP threshold value is used for normal resource exclusion, and the other RSRP threshold value is used for resource exclusion for solving the problem of the second terminal.

In the embodiment of the application, resource selection is performed based on coordination of the sending node and the receiving node, that is, the receiving node converts the sensing result of the receiving node to the second terminal into the resource reservation information of the receiving node by sending the Sidelink control information, and broadcasts the resource reservation information, so that the sending node can be prevented from selecting the resource occupied by the second terminal as much as possible, and the reliability of data transmission is improved. Meanwhile, the forwarded PSCCH is only used for resource selection by the transmitting node, and does not need to carry data in the PSCCH, so that the PSCCH corresponding to the PSCCH can be set to a zero-power PSCCH in order to avoid generating additional interference.

Referring to fig. 7, an embodiment of the present application provides an apparatus for controlling side link control channel power, where the apparatus 700 includes:

a first determining module 701, configured to determine the number of resource blocks RB of a physical side link shared channel psch transmission opportunity of a second terminal; wherein the RB of the PSSCH transmission opportunity is indicated by its associated first SCI format;

a second determining module 702, configured to determine, according to the number of RBs of the PSCCH transmission opportunity of the second terminal, a transmission power of a PSCCH transmitted by the first terminal;

a third determining module 703, configured to determine, according to the measured RSRP measurement value, a transmission power of a PSCCH sent by the first terminal; the RSRP measurement value is obtained based on received demodulation reference signal (DMRS) resource measurement of PSSCH or PSCCH of the second terminal.

In an embodiment of the present application, the first determining module 702 is further configured to: and determining the PSCCH transmission power of the first terminal according to the RB number of the PSCCH transmission opportunity of the first terminal, the RB number of the PSSCH transmission opportunity of the second terminal and the virtual PSSCH transmission power calculated by the first terminal according to the RB number of the PSSCH transmission opportunity of the second terminal.

In an embodiment of the present application, the first determining module 702 is further configured to: determining the transmission power of the PSCCH of the first terminal by the following formula;

wherein, P is _PSCCH,proxy Represents a transmit power of a PSCCH of the first terminal;

In this embodiment of the present application, the third determining module 703 is further configured to determine the transmit power of the PSCCH of the first terminal according to the measured RSRP measurement value and the side link path loss between the first terminal and the third terminal; the edge link path loss is sent by the third terminal to the first terminal.

In this embodiment of the present application, the third determining module 703 is further configured to determine the transmit power of the PSCCH of the first terminal according to the following formula;

P _PSCCH,proxy ＝min(P _CMAX ,P _MAX,CBR,v ,RSRP _hidden +PL _SL )

wherein, P _PSCCH,proxy Represents a transmit power of a PSCCH of the first terminal; RSRP _hidden A measured RSRP value measured for a DMRS resource based on the received psch or PSCCH of the second terminal; PL _SL Edge link path loss sent to the first terminal for the third terminal

The device provided by the embodiment of the application can realize each process realized by the method embodiment shown in fig. 3, and achieve the same technical effect, and for avoiding repetition, the details are not repeated here.

Referring to fig. 8, an embodiment of the present application provides a resource selection apparatus, where the apparatus 800 includes:

a first obtaining module 801, configured to obtain a first RSRP threshold;

a fifth determining module 802, configured to, when a reference signal received power PSCCH-RSRP of a side link control channel sent by a first terminal is higher than a first RSRP threshold corresponding to a priority group, exclude a reserved resource corresponding to the PSCCH sent by the first terminal;

wherein the priority group comprises a first priority and a second priority, and the first priority is a priority indicated by a priority domain in a PSCCH transmitted by the first terminal; the second priority is a transmission priority of the third terminal.

In the embodiment of the present application, the apparatus 800 further includes:

the third acquisition module is used for acquiring a second RSRP threshold value;

and the fourth determining module is used for executing the existing resource excluding process according to the second RSRP threshold value.

The device provided in the embodiment of the present application can implement each process implemented by the method embodiment shown in fig. 6, and achieve the same technical effect, and for avoiding repetition, details are not described here again.

The embodiment of the application also provides communication equipment. As shown in fig. 9, the communication device 900 includes: antenna 901, radio frequency device 902, baseband device 903. The antenna 901 is connected to a radio frequency device 902. In the uplink direction, rf device 902 receives information via antenna 901 and sends the received information to baseband device 903 for processing. In the downlink direction, the baseband device 903 processes information to be transmitted and transmits the processed information to the radio frequency device 902, and the radio frequency device 902 processes the received information and transmits the processed information through the antenna 901.

The above-mentioned frequency band processing means may be located in the baseband apparatus 903, and the method performed by the network side device in the above embodiment may be implemented in the baseband apparatus 903, where the baseband apparatus 903 includes a processor 904 and a memory 905.

The baseband apparatus 903 may include at least one baseband board, for example, a plurality of chips are disposed on the baseband board, as shown in fig. 9, where one chip, for example, the processor 904, is connected to the memory 1005, and calls the program in the memory 905 to perform the network device operations shown in the above method embodiments.

The baseband device 903 may further include a network interface 906 for exchanging information with the radio frequency device 902, for example, a Common Public Radio Interface (CPRI).

Specifically, the network side device of the embodiment of the present invention further includes: the instructions or programs stored in the memory 905 and capable of being executed on the processor 904, and the processor 904 calls the instructions or programs in the memory 905 to execute the methods executed by the modules shown in fig. 7 or 8, and achieve the same technical effects, which are not described herein in detail to avoid repetition.

The communication device provided in the embodiment of the present application can implement each process implemented by the method embodiment shown in fig. 3 or fig. 6, and achieve the same technical effect, and is not described herein again to avoid repetition.

An embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the method embodiment shown in fig. 3 or fig. 6, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

Wherein, the processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or may be embodied in software instructions executed by a processor. The software instructions may consist of a corresponding software module, which may be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, a removable hard disk, a compact disk, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may be carried in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described herein may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of this application and their equivalents, then this application is intended to cover such modifications and variations.

Claims

1. A method for side link control channel power control performed by a first terminal, comprising:

determining the number of Resource Blocks (RB) of a PSSCH transmission opportunity of a physical side link shared channel (PSSCH) of a second terminal; wherein the RB of the PSSCH transmission opportunity is indicated by an associated first sidelink control information format (SCI format);

or, determining the transmission power of the PSCCH transmitted by the first terminal according to the measured reference signal received power, RSRP, measurement value; the RSRP measurement value is measured based on received demodulation reference signal (DMRS) resources of the PSSCH or PSCCH of the second terminal.

2. The method of claim 1, wherein the determining the transmit power of the PSCCH transmitted by the first terminal based on the number of RBs of the PSCCH transmission opportunity of the second terminal comprises:

3. The method of claim 2, wherein the determining the transmission power of the PSCCH of the first terminal according to the number of RBs of the PSCCH transmission opportunity of the first terminal, the number of RBs of the PSCCH transmission opportunity of the second terminal, and the transmission power of the virtual PSCCH calculated by the first terminal according to the number of RBs of the PSCCH transmission opportunity of the second terminal comprises:

wherein, P _{PSCCH，proxy} Represents a transmit power of a PSCCH of the first terminal;

number of RBs of psch transmission opportunity for the second terminal; p _{PSSCH，virtual} The transmission power of the virtual PSSCH is calculated for the first terminal based on the number of RBs of the PSSCH transmission opportunity of the second terminal.

4. The method of claim 1, wherein the determining the transmit power of the physical side link control channel (PSCCH) transmitted by the first terminal according to the measured RSRP measurement value comprises:

5. The method of claim 4, wherein the determining the transmit power of the PSCCH for the first terminal from the measured RSRP measurement value and the side link path loss between the first terminal and the third terminal comprises:

P _{PSCCH，proxy} ＝min(P _CMAX ，P _{MAX，CBR，v} ，RSRP _hidden +PL _SL )

wherein, P _{PSCCH，proxy} Represents a transmit power of a PSCCH of the first terminal; RSRP _hidden A measured RSRP value measured for a DMRS resource based on the received psch or PSCCH of the second terminal; PL _SL Edge link path loss for the third terminal to send to the first terminal.

6. The method of claim 1,

the lowest subchannel transmitted by the PSSCH of the first terminal is the subchannel channel of the PSCCH transmitted on the uppermost RB and associated with the PSSCH of the first terminal;

7. A resource selection method performed by a third terminal, comprising:

the priority group comprises a first priority and a second priority, and the first priority is the priority indicated by a priority domain in the PSCCH sent by the first terminal; the second priority is a transmission priority of the third terminal.

8. The method of claim 7, further comprising:

acquiring a second RSRP threshold value;

9. An apparatus for side-link control channel power control, comprising:

a first determining module for determining an RB of a psch transmission opportunity of a second terminal; wherein the RB of the PSSCH transmission opportunity is indicated by its associated first SCI format;

or, a third determining module, configured to determine, according to the measured RSRP measurement value, a transmission power of a PSCCH sent by the first terminal; the RSRP measurement value is based on a received demodulation reference signal (DMRS) resource measurement of the PSSCH or PSCCH of the second terminal.

10. A resource selection apparatus, comprising:

a fifth determining module, configured to exclude a reserved resource corresponding to a PSCCH sent by a first terminal when a PSCCH-RSRP sent by the first terminal is higher than a first RSRP threshold corresponding to a priority group;

11. A communication device, comprising: processor, memory and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method according to any one of claims 1 to 8.

12. A readable storage medium, characterized in that it has stored thereon a program which, when being executed by a processor, carries out steps comprising the method according to any one of claims 1 to 8.