Side link control channel power control method, device, equipment and readable storage medium

Abstract

The embodiment of the present application provides a side link control channel power control method, apparatus, device and readable storage medium, the method comprising: obtaining the RB number of the PSSCH transmission opportunity of the second terminal, the resource block of the PSSCH transmission opportunity is indicated by the first SCI format associated therewith; according to the RB number of the PSSCH transmission opportunity of the second terminal, determining the transmit power of the PSCCH sent by the first terminal, or, according to the measured RSRP measurement value, determining the transmit power of the physical side link control channel PSCCH sent by the first terminal; the RSRP measurement value is obtained based on the DMRS resource measurement of the PSSCH or PSCCH of the received second terminal. In the embodiment of the present application, the transmit power of the PSCCH can be determined when the receiving node forwards the zero-power PSSCH, while trying to avoid the interference of the forwarded PSCCH to the surrounding nodes.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and specifically to a side link control channel power control method, device, equipment and readable storage medium. Background Art

[0002] According to the physical side link control channel (Physical SideLink Control Channel, PSCCH) and physical side link shared channel (Physical SideLink Shared Channel, PSSCH) power control scheme of the existing protocol, the sending node first determines the transmission power of PSSCH, and then determines the transmission power of PSCCH in proportion to the ratio of the physical resource blocks (PhysicalResource Block, PRB) occupied by PSCCH and PSSCH.

[0003] In the above-mentioned transmitting and receiving node coordination scheme, since the receiving node forwards the zero-power PSSCH, the transmission power of the corresponding PSCCH cannot be determined according to the existing scheme. Summary of the invention

[0004] The embodiments of the present application provide a side link control channel power control method, apparatus, device and readable storage medium to solve the problem of how to determine the transmission power of PSCCH.

[0005] In a first aspect, a side link control channel power control method is provided, which is performed by a first terminal and includes:

[0006] Determine an RB of a PSSCH transmission opportunity of the second terminal; wherein the RB of the PSSCH transmission opportunity is indicated by a first SCI format associated therewith;

[0007] Determine, according to the number of RBs of the PSSCH transmission opportunity of the second terminal, the transmit power of the physical side link control channel PSCCH sent by the first terminal;

[0008] Alternatively, the transmit power of the PSCCH sent by the first terminal is determined based on the measured RSRP measurement value; the RSRP measurement value is obtained based on the demodulation reference signal DMRS resource measurement of the PSSCH or PSCCH received by the second terminal.

[0009] Optionally, determining, according to the number of RBs of the PSSCH transmission opportunity of the second terminal, the transmit power of the PSCCH sent by the first terminal includes:

[0010] The PSCCH transmission power of the first terminal is determined based on the RB number of the PSCCH transmission opportunities of the first terminal, the RB number of the PSSCH transmission opportunities of the second terminal, and the transmission power of the virtual PSSCH calculated by the first terminal based on the RB number of the PSSCH transmission opportunities of the second terminal.

[0011] Optionally, the determining the transmit 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 PSSCH transmission opportunity of the second terminal, and the transmit power of the virtual PSSCH calculated by the first terminal according to the number of RBs of the PSSCH transmission opportunity of the second terminal, includes:

[0012] The transmit power of the PSCCH of the first terminal is determined by the following formula;

[0013]

[0014] Among them, P PSCCH,proxy Indicates the transmit power of the PSCCH of the first terminal; is the RB number of the PSCCH transmission opportunity of the first terminal; is the RB number of the PSSCH transmission opportunity of the second terminal; PSSCH,virtual It is the transmission power of the virtual PSSCH calculated by the first terminal according to the number of RBs of the PSSCH transmission opportunity of the second terminal.

[0015] Optionally, determining, according to the measured RSRP measurement value, a transmit power of a PSCCH sent by the first terminal includes:

[0016] The transmit power of the PSCCH of the first terminal is determined according to the measured RSRP measurement value and the side link path loss between the first terminal and the third terminal; the side link path loss is sent by the third terminal to the first terminal.

[0017] Optionally, 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:

[0018] The transmit power of the PSCCH of the first terminal is determined by the following formula;

[0019] P PSCCH,proxy =min(P CMAX ,P MAX,CBR,v ,RSRP hidden +PL SL )

[0020] Among them, P PSCCH,proxyIndicates the transmit power of the PSCCH of the first terminal; RSRP hidden is an RSRP measurement value measured based on the DMRS resource of the received PSSCH or PSCCH of the second terminal; PL SL is the side link path loss sent by the third terminal to the first terminal.

[0021] Optionally, the lowest subchannel subchannel of the PSSCH transmission of the first terminal is a subchannel of the top RB that transmits a PSCCH associated with the PSSCH of the first terminal;

[0022] Alternatively, the topmost subchannel of the PSSCH transmission of the first terminal is a subchannel of the PSCCH associated with the PSSCH of the first terminal sent on the topmost RB.

[0023] In a second aspect, a resource selection method is provided, which is performed by a third terminal and includes:

[0024] Obtaining a first RSRP threshold value; when the reference signal received power PSCCH-RSRP of the side link control channel sent by the first terminal is higher than the first RSRP threshold corresponding to the priority group, excluding the reserved resources corresponding to the PSCCH sent by the first terminal;

[0025] The priority group includes a first priority and a second priority, the first priority being the priority indicated by the priority field in the PSCCH sent by the first terminal; the second priority being the sending priority of the third terminal.

[0026] Optionally, the method further comprises:

[0027] Obtain a second RSRP threshold value;

[0028] According to the second RSRP threshold value, an existing resource exclusion process is executed.

[0029] In a third aspect, a side link control channel power control device is provided, including:

[0030] A first determination module, configured to determine an RB of a PSSCH transmission opportunity of a second terminal; wherein the RB of the PSSCH transmission opportunity is indicated by a first SCI format associated therewith;

[0031] A second determining module, configured to determine a transmit power of a PSCCH sent by the first terminal according to the number of RBs of a PSSCH transmission opportunity of the second terminal;

[0032] Alternatively, a third determination module is used to determine the transmit power of the PSCCH sent by the first terminal according to a measured RSRP measurement value; the RSRP measurement value is obtained based on the demodulation reference signal DMRS resource measurement of the PSSCH or PSCCH received by the second terminal.

[0033] In a fourth aspect, a resource selection device is provided, comprising:

[0034] A first acquisition module, used to acquire a first RSRP threshold value;

[0035] a fifth determination module, configured to exclude reserved resources corresponding to the PSCCH sent by the first terminal when the PSCCH-RSRP sent by the first terminal is higher than a first RSRP threshold corresponding to the priority group;

[0036] The priority group includes a first priority and a second priority, and the first priority is a priority in the PSCCH sent by the first terminal.

[0037] In a fifth aspect, a communication device is provided, comprising: a processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the steps of the method described in the first aspect or the second aspect.

[0038] In a sixth aspect, a readable storage medium is provided, on which a program is stored. When the program is executed by a processor, the steps of the method described in the first aspect or the second aspect are implemented.

[0039] In an embodiment of the present application, the first terminal can determine the transmission power of the PSCCH. Even if the first terminal forwards a zero-power PSSCH, the transmission power of the PSCCH can be determined, thereby avoiding interference of the behavior of sending the PSCCH to surrounding nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0041] Figure 1 It is a schematic diagram of the existing resource allocation method;

[0042] Figure 2 is a schematic diagram of the second terminal;

[0043] Figure 3 is a flow chart of a side link control channel power control method in an embodiment of the present application;

[0044] Figure 4 It is a schematic diagram of the frequency domain transmission position of the existing PSCCH;

[0045] Figure 5a and Figure 5b is a schematic diagram of the frequency domain transmission position of the PSCCH in an embodiment of the present application;

[0046] Figure 6 is a flowchart of a resource selection method in an embodiment of the present application;

[0047] Figure 7 is a schematic diagram of a side link control channel power control device in an embodiment of the present application;

[0048] Figure 8 is a schematic diagram of a resource selection device in an embodiment of the present application;

[0049] Fig. 9 It is a schematic diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] The term "comprise" and any variation thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. In addition, the use of "and / or" in the specification and claims to indicate at least one of the connected objects, such as A and / or B, means that A alone, B alone, and A and B exist in three cases.

[0052] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0053] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can 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" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the above-mentioned systems and radio technologies as well as other systems and radio technologies. However, the following description describes a new radio (NR) system for example purposes, and NR terms are used in most of the following descriptions, although these technologies can also be applied to applications other than NR system applications, such as the 6th Generation (6G) communication system.

[0054] The terminal herein may also be referred to as a terminal device or a user terminal (User Equipment, UE), and the terminal may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a mobile Internet device (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 wearable devices include: a bracelet, a headset, glasses, etc. It should be noted that the specific type of the terminal is not limited in the embodiments of the present application.

[0055] The network side device in this article can be a base station or a core network, wherein the base station can be referred to as a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a WLAN access point, a WiFi node, a transmitting and receiving point (Transmitting 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 the specified technical vocabulary. 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 the specific type of the base station is not limited.

[0056] In order to facilitate understanding of the embodiments of the present application, the following technical points are first introduced below:

[0057] 1. New Radio (NR) Vehicle to Everything (V2X) Mode-2 resource allocation:

[0058] NR V2X supports two resource allocation modes: Mode-1 resource allocation mode and Mode-2 resource allocation mode. Mode-1 is the resource allocation mode controlled by the base station, and Mode-2 is the resource allocation mode autonomously controlled by the terminal. The resource selection mode of Mode-2 is "listen before send", which determines the resources to be selected in the resource selection window based on the sensing of the resources in the sensing window. See Figure 1 , its basic working process is as follows:

[0059] (1) Determination of resource selection window and perception window: If resource selection is triggered at time n, then the resource selection window is [n+T 1 , n+T 2 ], the perception window is [nT 0 , nT pro,0 ];

[0060] T 1 It is a parameter selected by the terminal based on the implementation and satisfies 0 <= T 1 <=T proc,1 , T proc,1 is the maximum transmit / receive switching delay. For subcarrier spacing of 15 / 30 / 60 / 120kHz, Tproc,1 The values of

[0061] T 2 are parameters for the UE to make a selection based on implementation, and its value is related to the higher layer parameter T 2,min and the remaining packet delay budget. Specifically, if T 2,min < remaining PDB, then the value of T 2 should satisfy T 2,min <= T 2 <= remaining PDB; otherwise, T 2 = remaining PDB.

[0062] T 0 is a parameter of the sensing window, pre-configured per resource pool, and its value is 1100 ms or 100 ms.

[0063] T pro,0 is the UE processing delay. For subcarrier spacings of 15 / 30 / 60 / 120 kHz, the values of T pro,0 are 1 / 1 / 2 / 4 time slots respectively.

[0064] (2) Sensing process: That is, demodulate the Physical SideLink Control Channel (PSCCH) sent by other UEs in the sensing window and collect the Reference Signal Received Power (RSRP) information;

[0065] (3) Resource exclusion process:

[0066] i. V2X is half-duplex and cannot perform listening in its own transmission time slot. Therefore, it can only assume that other UEs reserve resources one or more times with all possible periods configured by the system in this time slot. When the reserved resources overlap with the candidate resources within the resource selection window or the periodic reserved resources after the candidate resources, exclude the said resources;

[0067] ii. Decode the occupied resources indicated by the Sidelink Control Information (SCI) and the subsequent one or more reserved resources. When they overlap with the candidate resources within the resource selection window or the one or more reserved resources after the candidate resources and the RSRP is higher than a certain threshold, exclude the said resources;

[0068] (4) If the remaining resources are less than X% of the全集, increase the RSRP threshold by 3 dB and repeat the resource exclusion step (3);

[0069] (5) Report the available resources to the Medium Access Control (MAC) layer, which performs random selection.

[0070] 2. The first stage of the sidelink control information (SCI) content (carried in PSCCH):

[0071] Priority: indicates the priority information of the corresponding PSSCH;

[0072] Time resource assignment: When the high-level configuration parameter sl-MaxNumPerReserve is 2, 5 bits of information are required, and when it is 3, 9 bits of information are required. The time domain position of the first PSSCH is the time slot where the SCI is located, and the time domain position of the second and / or third PSSCH is indicated by Time resource assignment;

[0073] Frequency resource assignment: The starting subchannel of the first PSSCH is the subchannel where the SCI is located. The Frequency resource assignment may indicate the starting subchannel of the second and / or third PSSCH, and the number of subchannels occupied by each PSSCH.

[0074] Resource reservation period: the resource reservation period.

[0075] ·other…

[0076] It can be seen that the V2X resource selection process (including sensing, resource exclusion, etc.) is performed by the transmitter, and the selected resources are those with relatively small interference from the perspective of the transmitter. The communication distance between the V2X transmitter and receiver is about 2.5 times the mobile speed, which can reach the level of 100 meters. Due to the complexity of the surrounding environment, the resource usage seen by the receiver and the transmitter will be quite different, that is, there will be Figure 2 The problem with hidden nodes is shown below:

[0077] If the transmission resources are determined only from the perspective of the transmitting end, it is easy for the receiving end to be seriously interfered with on the selected transmission resources, resulting in a low signal to interference noise ratio (SINR) and incorrect data demodulation.

[0078] See also Figure 3 An embodiment of the present application provides a side link control channel power control method, which is executed by a first terminal (or referred to as a first node, a receiving node, etc.), and the specific steps include: step 301, step 302 and step 303.

[0079] Step 301: Determine the number of RBs of a PSSCH transmission opportunity of a second terminal (or referred to as a second node, a transmitting node, a hidden node, etc.); wherein the RBs of the PSSCH transmission opportunity are indicated by the first side link control information format (SCI format) associated therewith;

[0080] It can be understood that the RB of the PSSCH transmission opportunity is composed of N consecutive subchannels, and the unit of the sidelink frequency domain scheduling is the subchannel.

[0081] Step 302: Determine the transmit power of the PSCCH transmitted by the first terminal according to the number of RBs of the PSSCH transmission opportunity of the second terminal;

[0082] Step 303: Determine the transmit power of the PSCCH sent by the first terminal according to the measured reference signal receiving power (RSRP) measurement value; the RSRP measurement value is obtained based on the demodulation reference signal (DMRS) resource measurement of the PSSCH or PSCCH received by the second terminal.

[0083] It can be understood that step 301 and step 302, as well as step 303 are two methods for determining the transmission power, and the first terminal selects which method to determine the transmission power can be indicated by one or more of the following methods: resource pool (pre) configuration, high-level signaling indication, and physical layer channel indication.

[0084] Among them, the reserved resources 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.

[0085] In the embodiment of the present application, determining the transmit power of the PSCCH of the first terminal according to the number of PRBs occupied by the PSSCH of the second terminal includes:

[0086] The PSCCH transmission power of the first terminal is determined based on the RB number of the PSCCH transmission opportunities of the first terminal, the RB number of the PSSCH transmission opportunities of the second terminal, and the transmission power of the virtual PSSCH calculated by the first terminal based on the RB number of the PSSCH transmission opportunities of the second terminal.

[0087] In this embodiment of the present application, the transmit power of the PSCCH of the first terminal is determined by the following formula:

[0088]

[0089] Among them, P PSCCH,proxy (i) represents the transmit power of the PSCCH of the first terminal; is the RB number of the PSCCH transmission opportunity of the first terminal; is the RB number of the PSSCH transmission opportunity of the second terminal; PSSCH,virtual (i) is the transmission power of the virtual PSSCH calculated by the first terminal according to the number of RBs of the PSSCH transmission opportunity of the second terminal, and i is a positive integer.

[0090] In the present embodiment, P PSSCH,virtual (i) can be calculated by the following formula.

[0091] P PSSCH,virtual (i) = min(P CMAX ,P MAX,CBR,v ,min(P PSSCH,D,v (i),P PSSCH,SL,v (i)))

[0092] [dBm]

[0093] Among them, P PSSCH,D,v (i) refers to the transmit power of the virtual PSSCH determined by using downlink (DL) reference signals (RS). Specifically, the sidelink terminal obtains the path loss by measuring the DL RS, thereby obtaining the transmit power of its PSSCH.

[0094] The purpose of using DL RS to determine the transmission power of PSSCH is to minimize interference to the uplink (UL) link of the Uu interface (ie, the New Radio (NR) interface).

[0095] PPSSCH,SL,v (i) refers to the transmit power of the virtual PSSCH determined by the sidelink RS. For example, whether to use DL RS or SL RS to determine the transmit power of the virtual PSSCH can be configured by the sidelink high-level parameters;

[0096] P CMAX It is the maximum transmit power of the sidelink terminal. It can be understood that the transmit power of the PSSCH determined based on the DL RS or the SL RS cannot exceed the limit of the maximum transmit power of the sidelink terminal.

[0097] P MAX,cBR,v It is a power control parameter configured by the high layer, which is related to the priority of the data carried by the PSSCH and the congestion of the current resource pool.

[0098] The above P CMAX ,P MAX,CBR,v , P PSSCH,D,v (i), (P PSSCH,D,v (i),P PSSCH,SL,v Parameters such as (i)) can be configured by higher-layer parameters for the PSCCH forwarded by the first terminal.

[0099] In an embodiment of the present application, determining the transmit power of the physical side link control channel PSCCH sent by the first terminal according to the measured RSRP measurement value includes:

[0100] The transmit power of the PSCCH of the first terminal is determined according to the measured RSRP measurement value and the side link path loss between the first terminal and the third terminal; the side link path loss is sent by the third terminal to the first terminal.

[0101] The main idea of ​​this solution is to make the RSRP of the control channel forwarded by the receiving node measured at the sending node side equivalent to the RSRP of the control channel or data channel of the hidden node measured by the receiving node.

[0102] Specifically, the receiving node perceives the PSCCH of the hidden node, and obtains the RSRP measurement value according to the DMRS resource of the PSCCH or PSSCH of the hidden node according to the RSRP measurement method (pre) configured in the resource pool, and sets it as RSRP_atRx; when the receiving node forwards the PSCCH, the RSRP measurement value of the PSCCH measured by the sending node is set to RSRP_atTx; when the receiving node sends the PSCCH, the transmit power determined by the receiving node should make RSRP_atTx approximately equal to RSRP_atRx after the path loss between the receiving node and the sending node. Therefore, the transmit power of the PSCCH of the receiving node is:

[0103] P PSCCH,proxy =min(P CMAX ,P MAX,CBR,v ,RSRP hidden +PL SL )

[0104] Among them, P PSCCH,proxy Indicates the transmit power of the PSCCH of the first terminal (receiving node); RSRP hidden The RSRP measurement value is based on the DMRS resource measurement of the received PSSCH or PSCCH of the second terminal (hidden node); PL sL is the path loss of the side link sent from the third terminal (sending node) to the first terminal (receiving node).

[0105] This solution is applicable to the communication mode between the sending node and the receiving node in unicast or multicast mode, and the sending node is configured to measure the path loss based on the sidelink. In the existing protocol, the sending node obtains the path loss according to the following formula: PL SL =referenceSignalPower–higher layer filtered RSRP, where referenceSignalPower is obtained by the transmitting node based on the antenna port and the number of REs occupied by the PSSCH (i.e., the power spectrum density multiplied by the number of REs occupied); higherlayer filtered RSRP is the RSRP measurement value obtained by the receiving node measuring the PSSCH sent by the transmitting node; further, the receiving node sends the measurement value to the transmitting node, and the transmitting node subtracts RSRP from the transmit power to obtain the path loss. In this solution, the transmitting node needs to send the calculated path loss back to the receiving node.

[0106] In this scheme, since 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 received by the receiving node, there is no need to define another set of priority group RSRP thresholds. Instead, the existing configuration thresholds can be directly reused to perform resource exclusion.

[0107] In an embodiment of the present application, the bottom subchannel of the PSSCH transmission of the first terminal is the subchannel of the PSCCH associated with the PSSCH of the first terminal sent on the top RB; or, the top subchannel of the PSSCH transmission of the first terminal is the subchannel of the PSCCH associated with the PSSCH of the first terminal sent on the top RB.

[0108] See also Figure 4-5a and Figure 5b ,in Figure 4 Indicates the existing PSCCH transmission position. According to the current protocol, the frequency domain transmission position of PSCCH is counted upward from the lowest RB in the lowest subchannel of the frequency domain position occupied by its corresponding PSSCH. At this time, when the receiving node occupies the frequency domain resources to forward PSCCH according to the same rule, it will cause greater interference to the surrounding nodes occupying the same / overlapping transmission resources.

[0109] Figure 5a The PSCCH frequency domain resources are counted from the top RB of the subchannel with the lowest frequency domain position occupied by the corresponding PSSCH as the starting position. Figure 5b The number of RBs counted downwards is the number of RBs for PSCCH transmission opportunities, which are pre-configured per resource pool.

[0110] In an embodiment of the present application, the first terminal can determine the transmission power of the PSCCH. Even if the first terminal forwards a zero-power PSSCH, the transmission power of the PSCCH can be determined, thereby avoiding interference of the behavior of sending the PSCCH to surrounding nodes.

[0111] See also Figure 6 , an embodiment of the present application provides a transmission method, which is executed by a third terminal (or called a sending node), and the specific steps include: step 601 and step 602.

[0112] Step 601: Obtain a first RSRP threshold value;

[0113] Step 602: When the PSCCH-RSRP sent by the first terminal is higher than the first RSRP threshold corresponding to the priority group, excluding the reserved resources corresponding to the PSCCH sent by the first terminal;

[0114] The priority group includes a first priority and a second priority, the first priority being the priority indicated by the priority field in the PSCCH sent by the first terminal; the second priority being the sending priority of the third terminal.

[0115] In an embodiment of the present application, the method further includes: obtaining a second RSRP threshold value; and executing an existing resource exclusion process according to the second RSRP threshold value.

[0116] Since the first terminal (receiving node) determines the transmission power of PSCCH by the number of RBs of the PSSCH transmission opportunity of the second terminal (such as a hidden node), and the distance between the second terminal and the first terminal is farther than the distance between the first terminal and the transmitting node, the RSRP of the PSCCH forwarded by the first terminal sensed by the transmitting node is lower than the RSRP of the PSCCH of the second terminal sensed by the first terminal. In order to ensure that the transmitting node can exclude the reserved resources corresponding to the PSCCH forwarded by the first terminal, it is necessary to define two sets of RSRP threshold values ​​with different priorities, one RSRP threshold value is used for normal resource exclusion, and the other RSRP threshold value is used to solve the resource exclusion problem of the second terminal.

[0117] In the embodiment of the present application, resource selection is performed based on the coordination between the sending node and the receiving node, that is, the receiving node converts its perception result of the second terminal into its own resource reservation information and broadcasts it by sending the Sidelink control information, which can avoid the sending node from selecting the resources occupied by the second terminal as much as possible, thereby improving the reliability of data transmission. At the same time, since the forwarded PSCCH is only for the sending node to select resources and does not need to carry data in the PSSCH, in order to avoid additional interference, the corresponding PSSCH can be set to zero-power PSSCH.

[0118] See also Figure 7 , an embodiment of the present application provides a side link control channel power control device, the device 700 includes:

[0119] The first determination module 701 is used to determine the number of resource blocks RB of the physical side link shared channel PSSCH transmission opportunity of the second terminal; wherein the RB of the PSSCH transmission opportunity is indicated by the first SCI format associated therewith;

[0120] A second determining module 702, configured to determine a transmit power of a PSCCH transmitted by the first terminal according to the number of RBs of a PSSCH transmission opportunity of the second terminal;

[0121] The third determination module 703 is used to determine the transmission power of the PSCCH sent by the first terminal according to the measured RSRP measurement value; the RSRP measurement value is obtained based on the demodulation reference signal DMRS resource measurement of the PSSCH or PSCCH received by the second terminal.

[0122] In an embodiment of the present application, the second determination module 702 is further used to determine the transmission power of the PSCCH of the first terminal based on the number of RBs of the PSCCH transmission opportunities of the first terminal, the number of RBs of the PSSCH transmission opportunities of the second terminal, and the transmission power of the virtual PSSCH calculated by the first terminal based on the number of RBs of the PSSCH transmission opportunities of the second terminal.

[0123] In the embodiment of the present application, the second determination module 702 is further used to: determine the transmit power of the PSCCH of the first terminal by the following formula;

[0124]

[0125] Among them, P PSCCH,proxy Indicates the transmit power of the PSCCH of the first terminal; is the RB number of the PSCCH transmission opportunity of the first terminal; is the RB number of the PSSCH transmission opportunity of the second terminal; PSSCH,virtual It is the transmission power of the virtual PSSCH calculated by the first terminal according to the number of RBs of the PSSCH transmission opportunity of the second terminal.

[0126] In an embodiment of the present application, the third determination module 703 is further used to determine the transmit power of the PSCCH of the first terminal based on the measured RSRP measurement value and the side link path loss between the first terminal and the third terminal; the side link path loss is sent by the third terminal to the first terminal.

[0127] In the embodiment of the present application, the third determination module 703 is further used to determine the transmit power of the PSCCH of the first terminal by the following formula;

[0128] P PSCCH,proxy =min(P CMAX ,P MAX,CBR,v ,RSRP hidden +PL SL )

[0129] Among them, P PSCCH,proxy Indicates the transmit power of the PSCCH of the first terminal; RSRP gidden is an RSRP measurement value measured based on the DMRS resource of the received PSSCH or PSCCH of the second terminal; PL SL is the path loss of the side link sent from the third terminal to the first terminal

[0130] In an embodiment of the present application, the bottom subchannel of the PSSCH transmission of the first terminal is the subchannel of the PSCCH associated with the PSSCH of the first terminal sent on the top RB; or, the top subchannel of the PSSCH transmission of the first terminal is the subchannel of the PSCCH associated with the PSSCH of the first terminal sent on the top RB.

[0131] The device provided in the embodiment of the present application can achieve Figure 3 The various processes implemented by the method embodiment shown achieve the same technical effect and will not be described again here to avoid repetition.

[0132] See also Figure 8 , an embodiment of the present application provides a resource selection device, the device 800 comprising:

[0133] A first acquisition module 801 is used to acquire a first RSRP threshold value;

[0134] A fifth determination module 802 is configured to exclude reserved resources corresponding to the PSCCH sent by the first terminal when the reference signal received power PSCCH-RSRP of the side link control channel sent by the first terminal is higher than the first RSRP threshold corresponding to the priority group;

[0135] Among them, the priority group includes a first priority and a second priority, the first priority is the priority indicated by the priority field in the PSCCH sent by the first terminal; the second priority is the sending priority of the third terminal.

[0136] In the embodiment of the present application, the device 800 further includes:

[0137] A third acquisition module is used to obtain a second RSRP threshold value;

[0138] The fourth determining module is used to execute the existing resource exclusion process according to the second RSRP threshold value.

[0139] The device provided in the embodiment of the present application can achieve Figure 6 The various processes implemented by the method embodiment shown achieve the same technical effect and will not be described again here to avoid repetition.

[0140] The present application also provides a communication device. Fig. 9As shown, the communication device 900 includes: an antenna 901, a radio frequency device 902, and a baseband device 903. The antenna 901 is connected to the radio frequency device 902. In the uplink direction, the radio frequency device 902 receives information through the antenna 901 and sends the received information to the baseband device 903 for processing. In the downlink direction, the baseband device 903 processes the information to be sent and sends it to the radio frequency device 902. The radio frequency device 902 processes the received information and sends it out through the antenna 901.

[0141] The frequency band processing device may be located in the baseband device 903 . The method performed by the network-side device in the above embodiment may be implemented in the baseband device 903 . The baseband device 903 includes a processor 904 and a memory 905 .

[0142] The baseband device 903 may include, for example, at least one baseband board on which a plurality of chips are arranged. Fig. 9 As shown, one of the chips is, for example, a processor 904, which is connected to a memory 1005 to call a program in the memory 905 to execute the network device operations shown in the above method embodiment.

[0143] The baseband device 903 may further include a network interface 906 for exchanging information with the radio frequency device 902 . The interface may be, for example, a common public radio interface (CPRI for short).

[0144] Specifically, the network side device of the embodiment of the present invention further includes: an instruction or program stored in the memory 905 and executable on the processor 904, and the processor 904 calls the instruction or program in the memory 905 to execute Figure 7 Or the method executed by each module shown in 8, and achieves the same technical effect, to avoid repetition, it will not be repeated here.

[0145] The communication device provided in the embodiment of the present application can achieve Figure 3 or Figure 6 The various processes implemented by the method embodiment shown achieve the same technical effect and will not be described again here to avoid repetition.

[0146] The embodiment of the present application also provides a readable storage medium on which a program or instruction is stored. When the program or instruction is executed by a processor, the above Figure 3 or Figure 6 The various processes of the method embodiment shown can achieve the same technical effect, and will not be described again here to avoid repetition.

[0147] 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 computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0148] The steps of the method or algorithm described in conjunction with the contents disclosed in this application can be implemented in hardware or by executing software instructions in a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disks, mobile hard disks, read-only optical disks, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be carried in an ASIC. In addition, the ASIC can be carried in a core network interface device. Of course, the processor and the storage medium can also exist in the core network interface device as discrete components.

[0149] Those skilled in the art should be aware that in one or more of the above examples, the functions described in this application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that a general or special-purpose computer can access.

[0150] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation methods of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application should be included in the scope of protection of the present application.

[0151] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the embodiments of the present application may adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the embodiments of the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0152] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0153] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0154] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0155] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A side link control channel power control method, performed by a first terminal, characterized in that: include: Determine the number of resource blocks RB of the physical side link shared channel PSSCH transmission opportunity of the second terminal; wherein the RB of the PSSCH transmission opportunity is indicated by the first side link control information format SCI format associated therewith; Determine, according to the number of RBs of the PSSCH transmission opportunity of the second terminal, the transmit power of the physical side link control channel PSCCH sent by the first terminal; The determining, according to the number of RBs of the PSSCH transmission opportunity of the second terminal, the transmit power of the PSCCH sent by the first terminal includes: Determine the transmit 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 PSSCH transmission opportunity of the second terminal, and the transmit power of the virtual PSSCH calculated by the first terminal according to the number of RBs of the PSSCH transmission opportunity of the second terminal; Among them, the determining the transmit 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 PSSCH transmission opportunity of the second terminal, and the transmit power of the virtual PSSCH calculated by the first terminal according to the number of RBs of the PSSCH transmission opportunity of the second terminal, includes: The transmit power of the PSCCH of the first terminal is determined by the following formula; Among them, P PSCCH,proxy Indicates the transmit power of the PSCCH of the first terminal; is the RB number of the PSCCH transmission opportunity of the first terminal; is the RB number of the PSSCH transmission opportunity of the second terminal; PSSCH,virtual It is the transmission power of the virtual PSSCH calculated by the first terminal according to the number of RBs of the PSSCH transmission opportunity of the second terminal.

2. The method according to claim 1, characterized in that The bottom subchannel subchannel of the PSSCH transmission of the first terminal is the subchannel of the PSCCH associated with the PSSCH of the first terminal transmitted on the top RB; Alternatively, the topmost subchannel of the PSSCH transmission of the first terminal is a subchannel of the PSCCH associated with the PSSCH of the first terminal sent on the topmost RB.

3. A side link control channel power control device, characterized in that: include: A first determination module, configured to determine an RB of a PSSCH transmission opportunity of a second terminal; wherein the RB of the PSSCH transmission opportunity is indicated by a first SCI format associated therewith; A second determining module, configured to determine a transmit power of a PSCCH sent by the first terminal according to the number of RBs of a PSSCH transmission opportunity of the second terminal; The second determination module is further used to determine the transmit power of the PSCCH of the first terminal by the following formula; Among them, P PSCCH,proxy Indicates the transmit power of the PSCCH of the first terminal; is the RB number of the PSCCH transmission opportunity of the first terminal; is the RB number of the PSSCH transmission opportunity of the second terminal; PSSCH,virtual It is the transmission power of the virtual PSSCH calculated by the first terminal according to the number of RBs of the PSSCH transmission opportunity of the second terminal.

4. A communication device, characterized in that: include: A processor, a memory, and a program stored in the memory and executable on the processor, wherein the program implements the steps of the method according to any one of claims 1 to 2 when executed by the processor.

5. A readable storage medium, characterized in that: The readable storage medium stores a program, and when the program is executed by a processor, the steps of the method according to any one of claims 1 to 2 are implemented.

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