SYSTEM AND METHOD FOR CONTROLLING THE POWER OF A SIDELINK REFERENCE SIGNAL - Patent application

Abstract

A system and method for a wireless communication system are disclosed. In one aspect, the wireless communication method includes determining a power by a first wireless communication device and transmitting a reference signal having the power by the first wireless communication device in a sidelink communication to a second wireless communication device. The power is determined based on one or more sidelink parameters related to a priority level associated with the reference signal. In one embodiment, the one or more sidelink parameters are also related to a capability, a path loss, and a channel busy ratio (CBR).

Description

[Technical field]

[0001] The present disclosure relates generally to wireless communications, including, but not limited to, systems and methods for controlling power of sidelink positioning reference signals. [Background technology]

[0002] The standardization body, the 3rd Generation Partnership Project (3GPP®), is currently specifying the Next Generation Packet Core Network (NG-CN or NGC) as well as a new air interface called 5G New Radio (5G NR). 5G NR has three main components: 5G Access Network (5G-AN), 5G Core Network (5GC), and User Equipment (UE). To facilitate the enablement of different data services and requirements, the elements of 5GC, also called Network Functions (NFs), have been simplified and some of them are software-based, so that they can be adapted as needed. Summary of the Invention [Means for solving the problem]

[0003] One aspect is a method of wireless communication that includes determining, by a first wireless communication device, a power and transmitting, by the first wireless communication device, a positioning reference signal having the power in a sidelink communication to a second wireless communication device, the power being determined based on one or more sidelink parameters related to a priority level associated with the positioning reference signal.

[0004] In some configurations, the one or more sidelink parameters also relate to capacity, path loss, and channel busy ratio (CBR).

[0005] In some configurations, the one or more sidelink parameters may be offset by the following:

number

number

number

number

number

[0006] In some configurations, the offset

number

number

[0007] In some configurations, the priority level for a transmission opportunity of the positioning reference signal is one of a number of integers indicated in sidelink control information (SCI).

[0008] In some configurations, the parameter P SL-PRS,D (i) represents the number of resource blocks of the transmission opportunity of the positioning reference signal.

number

[0009] In some configurations, the parameter P SL-PRS,SL (i) represents a sidelink path loss estimate for at least one of unicast, groupcast, or broadcast; SL In some configurations, for groupcast and broadcast, the parameter PL SL is a weighted sum of multiple unicast sidelink path loss estimates between the first wireless communication device and the second wireless communication device.

[0010] In some configurations, the one or more sidelink parameters are

number

number

[0011] In some configurations, the parameter

number

[0012] In some configurations, the method includes determining, by the first wireless communication device, that a parameter sl-MaxTxPower-PRS is provided by an upper layer; and determining, by the first wireless communication device, a parameter sl-MaxTxPower-PRS based on a priority level of the positioning reference signal and a CBR range for the positioning reference signal.

number

[0013] In some configurations, the priority level for a transmission opportunity is indicated by one of a number of integers indicated in sidelink control information (SCI).

[0014] In some configurations, the parameter

number

[0015] In some configurations, the method includes determining, by the first wireless communication device, that a parameter sl-MaxTxPower is provided by a higher layer and that a parameter sl-MaxTxPower-PRS is not provided; and determining, by the first wireless communication device, that a parameter sl-MaxTxPower-PRS is provided by a higher layer.

number

number

number

[0016] In some configurations, the parameter

number

[0017] In some configurations, the priority level for a transmission opportunity of the positioning reference signal is one of a number of integers indicated in sidelink control information (SCI).

[0018] In some configurations, the method includes determining, by the first wireless communication device, that neither the parameter sl-MaxTxPower nor the parameter sl-MaxTxPower-PRS is provided; and determining, by the first wireless communication device, that the parameter

number

number

[0019] In some configurations, determining the power includes determining, by the first wireless communication device, a parameter P SL-PRS,D (i) and P SL-PRS,SL and determining a power based on the parameter P. SL-PRS,D (i) represents the power based on the downlink path loss of the transmission opportunity of the positioning reference signal, and the parameter P SL-PRS,SL (i) represents the power based on the sidelink path loss of the positioning reference signal transmission opportunity.

[0020] In some configurations, the parameter P SL-PRS,D (i) is

number

number

number

number

[0021] In some configurations, the parameter P SL-PRS,SL (i) represents a sidelink path loss estimate for at least one of unicast, groupcast, or broadcast; SL For groupcast and broadcast, the parameter PL SL is a weighted sum of multiple unicast sidelink path loss estimates between the first wireless communication device and the second wireless communication device.

[0022] In some configurations, the parameter P SL-PRS,SL (i) is

number

number

number

number

[0023] In some configurations, the one or more sidelink parameters are adjusted using the following adjustment factors:D or f SL The adjustment factor f D is the parameter P SL-PRS,D represents the closed-loop adjustment factor for (i), and the adjustment factor f SL is the parameter P SL-PRS,SL represents the closed loop adjustment factor for (i).

[0024] In some configurations, the adjustment factor f D and the adjustment factor f SL are indicated by downlink control information (DCI) and sidelink control information (SCI), respectively.

[0025] In some configurations, the one or more sidelink parameters may include:

number

[0026] In some configurations, the offset Δ SL-PRS is determined based on the priority level of the positioning reference signal.

[0027] In some configurations, the priority level for a transmission opportunity of the positioning reference signal is one of a number of integers indicated in sidelink control information (SCI).

[0028] In some configurations, the parameter

number

[0029] In some configurations, the parameter

number

[0030] In some configurations, the parameter

number

[0031] Another aspect is a wireless communication method that includes receiving, by a second wireless communication device, in a sidelink communication from a first wireless communication device, a positioning reference signal having a power determined by the first wireless communication device based on one or more sidelink parameters related to capabilities and path loss of the first communication device and related to a priority level associated with the positioning reference signal.

[0032] Another aspect is a wireless communications apparatus including a processor and a memory, the processor configured to read code from the memory and to perform a method according to any of the preceding aspects.

[0033] Another aspect is a computer program product including a computer readable program medium having code stored thereon, the code, when executed by a processor, causing the processor to perform a method according to any of the preceding configurations. [Brief description of the drawings]

[0034] [Figure 1] FIG. 1 illustrates an example of a wireless communication system capable of implementing the techniques disclosed herein according to some configurations of the present disclosure.

[0035] [Diagram 2] FIG. 2 illustrates a block diagram of an example wireless communication system for transmitting and receiving wireless communication signals (eg, Orthogonal Frequency Division Multiplexing (OFDM) signals or Orthogonal Frequency Division Multiple Access (OFDMA) signals) in accordance with some aspects of the present disclosure.

[0036] [Diagram 3]FIG. 3 illustrates a flow chart of an example wireless communication process according to some configurations of the present disclosure. [Figure 4] FIG. 4 illustrates a flow chart of an example wireless communication process according to some configurations of the present disclosure. [Diagram 5] FIG. 5 illustrates a flow chart of an example wireless communication process according to some configurations of the present disclosure. [Figure 6] FIG. 6 illustrates a flow chart of an example wireless communication process according to some configurations of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] In order to enable those skilled in the art to make and use the present solution, various exemplary configurations of the present solution are described below with reference to the accompanying drawings. As will be apparent to those skilled in the art, after reading this disclosure, various modifications or changes to the examples described herein can be made without departing from the scope of the present solution. Thus, the present solution is not limited to the exemplary configurations and applications described and illustrated herein. Furthermore, the specific order or hierarchy of steps in the methods disclosed herein is merely an example approach. Based on design preferences, the specific order or hierarchy of steps of the disclosed methods or processes can be rearranged while remaining within the scope of the present solution. Thus, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or operations in a sample order, and that the present solution is not limited to the specific order or hierarchy presented, unless otherwise specified.

[0038] FIG. 1 illustrates an example of a wireless communication system 100 capable of implementing the techniques disclosed herein according to some configurations of the present disclosure. In the following description, the wireless communication system 100 can implement any wireless network, such as a cellular network or a narrowband Internet of Things (NB-IoT) network. Such an example system 100 includes a base station (BS) 102 (also referred to as a wireless communication node) and a UE 104 (also referred to as a wireless communication device) that can communicate with each other via a communication link 110 (e.g., a wireless communication channel), and a cluster of cells 126, 130, 132, 134, 136, 138, and 140 that overlap a geographical region 101. In some examples, the network refers to one or more BSs (e.g., BS 102) that communicate with the UE 104, and back-end entities and functions (e.g., Location Management Function (LMF)). In other words, the network refers to components of the system 100 other than the UE 104. In FIG. 1, the BS 102 and the UE 104 are included within the respective geographical boundaries of the cell 126. Each of the other cells 130, 132, 134, 136, 138, and 140 may include at least one base station operating in its assigned bandwidth to provide adequate wireless communication coverage to its intended users.

[0039] For example, the BS 102 may operate in an assigned channel transmission bandwidth to provide adequate communication coverage to the UE 104. The BS 102 and the UE 104 may communicate via downlink radio frames 118 and uplink radio frames 124, respectively. Each radio frame 118 / 124 may be further divided into subframes 120 / 127 that may include data symbols 122 / 128. In this disclosure, the BS 102 and the UE 104 are generally described herein as non-limiting examples of "communication nodes" capable of implementing the methods disclosed herein. Such communication nodes may be capable of wireless and / or wired communication in accordance with various configurations of the present solution.

[0040] 2 illustrates a block diagram of an example wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM or OFDMA signals) according to some configurations of the present disclosure. System 200 may include components and elements configured to support known or conventional operational features that need not be described in detail herein. In one exemplary configuration, as previously described, system 200 may be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment, such as system 100 of FIG. 1.

[0041] The system 200 generally includes a base station 202 (hereinafter "BS 202") and a user equipment device 204 (hereinafter "UE 204"). The BS 202 includes a BS transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each of which is coupled and interconnected with each other as needed via a data communication bus 220. The UE 204 includes a UE transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each of which is coupled and interconnected with each other as needed via a data communication bus 240. The BS 202 communicates with the UE 204 over a communication channel 250, which can be any wireless channel or other medium suitable for the transmission of data as described herein.

[0042] As will be appreciated by those skilled in the art, system 200 may further include any number of modules other than those shown in FIG. 2. Those skilled in the art will appreciate that the various example blocks, modules, circuits, and processing logic described in connection with the configurations disclosed herein may be implemented in hardware, computer readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, the various example components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software may depend on the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a manner suitable for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present disclosure.

[0043] According to some configurations, the UE transceiver 230 may be referred to herein as an "uplink" transceiver 230 including a radio frequency (RF) transmitter and an RF receiver each including circuitry coupled to an antenna 232. Alternatively, a duplexing switch (not shown) may couple the uplink transmitter or receiver to the uplink antenna in a time-duplexing manner. Similarly, according to some configurations, the BS transceiver 210 may be referred to herein as a "downlink" transceiver 210 including an RF transmitter and an RF receiver each including circuitry coupled to an antenna 212. Alternatively, a downlink duplexing switch may couple the downlink transmitter or receiver to the downlink antenna 212 in a time-duplexing manner. The operation of the two transceiver modules 210 and 230 may be coordinated in time such that the downlink transmitter is coupled to the downlink antenna 212 at the same time that the uplink receiver circuitry is coupled to the uplink antenna 232 for receiving transmissions over the wireless transmission link 250. Conversely, the operation of the two transceivers 210 and 230 may be coordinated in time such that the uplink transmitter is coupled to the uplink antenna 232 at the same time that the downlink receiver is coupled to the downlink antenna 212 for receiving transmissions over the wireless transmission link 250. In some configurations, there is a truncated time synchronization with a minimum guard time between changes in duplex direction.

[0044] The UE transceiver 230 and the base station transceiver 210 are configured to communicate over a wireless data communication link 250 and cooperate with appropriately configured RF antenna devices 212 / 232 capable of supporting a particular wireless communication protocol and modulation scheme. In some exemplary configurations, the UE transceiver 210 and the base station transceiver 210 are configured to support industry standards such as Long Term Evolution (LTE) and the emerging 5G standard. However, it will be understood that the present disclosure is not necessarily limited to application to a particular standard and associated protocol. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternative or additional wireless data communication protocols, including future standards or variations thereof.

[0045] According to various configurations, the BS 202 may be, for example, an evolved Node B (eNB), a serving eNB, a target eNB, a femto station, or a pico station. In some configurations, the UE 204 may be embodied in various types of user devices, such as a mobile phone, a smartphone, a personal digital assistant (PDA), a tablet, a laptop computer, a wearable computing device, etc. The processor modules 214 and 236 may be implemented or realized using a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. Thus, the processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, etc. The processor may also be implemented as a combination of computing devices, such as a combination of a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other such configuration.

[0046] Furthermore, the steps of the method or algorithm described in connection with the configurations disclosed herein may be embodied directly in hardware, firmware, software modules executed by the processor modules 214 and 236, respectively, or any practical combination thereof. The memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. In this regard, the memory modules 216 and 234 may be coupled to the processor modules 210 and 230, respectively, such that the processor modules 210 and 230 can read information from and write information to the memory modules 216 and 234, respectively. The memory modules 216 and 234 may be integrated into the respective processor modules 210 and 230. In some configurations, the memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor modules 210 and 230, respectively. Each of the memory modules 216 and 234 may also include non-volatile memory for storing instructions executed by the processor modules 210 and 230, respectively.

[0047] The network communications module 218 generally represents hardware, software, firmware, processing logic, and / or other components of the base station 202 that enable bidirectional communication between the base station transceiver 210 and other network components and communication nodes configured to communicate with the base station 202. For example, the network communications module 218 may be configured to support Internet or WiMAX traffic. In a typical arrangement, without limitation, the network communications module 218 provides an 802.3 Ethernet interface so that the base station transceiver 210 can communicate with a conventional Ethernet-based computer network. As such, the network communications module 218 may include a physical interface for connecting to a computer network (e.g., a Mobile Switching Center (MSC)). The terms "configured for," "configured to," and conjugations thereof, as used herein with respect to a specified operation or function, refer to a device, component, circuit, structure, machine, signal, etc. that is physically configured, programmed, formatted, and / or arranged to perform the specified operation or function.

[0048] The Open Systems Interconnection (OSI) model (referred to herein as the "Open Systems Interconnection Model") is a conceptual and logical layout that defines the network communications used by systems (e.g., wireless communication devices, wireless communication nodes) that are open to interconnection and communication with other systems. The model is divided into seven subcomponents or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI model also defines logical networks, effectively describing computer packet transfers by using different layer protocols. The OSI model may be referred to as the seven-layer OSI model or seven-layer model. In some configurations, the first layer may be the physical layer. In some configurations, the second layer may be the MAC layer. In some configurations, the third layer may be the Radio Link Control (RLC) layer. In some configurations, the fourth layer may be the Packet Data Convergence Protocol (PDCP) layer. In some configurations, the fifth layer may be the Radio Resource Control (RRC) layer. In some configurations, the sixth layer may be a Non-Access Stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer is another layer.

[0049] Power Control for Sidelink Positioning Reference Signals

[0050] Positioning provides the target UE with information about its location. Sidelink positioning may be used. For example, an anchor UE communicating with the target UE in sidelink may be used to facilitate improved positioning accuracy. However, methods for transmitting and configuring sidelink positioning reference signals (SL-PRS) may not be available. In some embodiments, power control of SL-PRS transmissions may be improved.

[0051] Power control is formulated for physical sidelink control channel (PSCCH) transmission and physical sidelink shared channel (PSSCH) transmission. For positioning, the anchor UE transmits the SL-PRS to the target UE, and the target UE obtains positioning measurements by measuring the SL-PRS. Radio-dependent positioning methods can then be used to calculate the position of the target UE. However, the transmission power and power control of the SL-PRS may be unclear.

[0052] (UE capability and path loss based power control)

[0053] In some embodiments, power control for the PSSCH and PSCCH may be formulated based on UE capabilities and path loss. By utilizing the power control equation for the PSSCH, some offsets are introduced into the power control equation for the SL-PRS to eliminate the mismatch between the PSSCH transmit power and the SL-PRS transmit power.

[0054] For SL-PRS transmission, the UE allocates power P SL-PRS (i) is determined as follows:

number

number

number

[0055] The priority of the SL-PRS is indicated by a priority indicator, which may include an integer value selected from 1 to 8. The priority indicator of the SL-PRS may be configured in each SL-PRS configuration, and each SL-PRS configuration may be indicated by a sidelink control signal (SCI).

[0056] The CBR measured in slot n may be defined as the portion of subchannels in the resource pool whose SL received signal strength indicator (RSSI) measured by the UE exceeds a configured (or preconfigured) threshold sensed over the CBR measurement window [na,n-1], according to the higher layer parameter sl-TimeWindowSizeCBR, where a is approximately equal to 100 or approximately 100·2μ slots.

[0057]

number

number

number

[0058] If dl-P0-PSSCH-PSCCH is provided,

number

number

number

[0059] If sl-P0-PSSCH-PSCCH is provided,

number

number

number

number

number

[0060] If the SCI format that schedules the SL-PRS transmission includes a cast type indicator field indicating groupcast or broadcast, the PL SL is the groupcast / broadcast sidelink pathloss estimate in dB calculated by the transmitting UE using the reference signal. The groupcast / broadcast sidelink pathloss estimate is then the weighted sum of all unicast sidelink pathloss estimates between the transmitting UE and the target UE, i.e.

number

number

number

number

number

number

number

number

number

number

[0061] Therefore, the SL-PRS transmission power can be flexible and controllable. Furthermore, this SL-PRS power control formula supports SL-PRS transmission in groupcast and broadcast.

[0062] (Power control formula and related parameter design)

[0063] In some embodiments, with respect to the SL-PRS transmit power, another solution is to design a specific power control formula and related parameters. Based on the UE's capabilities and path loss, the UE may determine the SL-PRS transmit power P SL-PRS (i) is determined as follows:

number

[0064] If sl-MaxTxPower-PRS is provided,

number

[0065] The priority of the SL-PRS is indicated by a priority indicator, which is an integer value selected from 1 to 8. The priority indicator of the SL-PRS is configured in each SL-PRS configuration indicated by the SCI. In some embodiments, the anchor UE may transmit the SCI to the target UE.

[0066] The SL-PRS CBR measured in slot n may be defined as the portion of the SL-PRS subchannels in the SL-PRS resource pool whose RSSI as measured by the UE exceeds a configured (or preconfigured) threshold sensed over the SL-PRS CBR measurement window [na,n-1], according to the higher layer parameter sl-TimeWindowSizeCBR-PRS, where a is approximately equal to 100 or approximately 100·2 μslots.

[0067] The priority indicator of the SL-PRS indicated by the SCI and the SL-PRS CBR measured by the transmitting UE.

number

number

number

[0068] If sl-MaxTxPower-PRS is not provided and sl-MaxTxPower is provided,

number

number

number

number

[0069] If both sl-MaxTxPower-PRS and sl-MaxTxPower are not provided,

number

[0070] If dl-P0-PRS is provided,

number

number

number

number

number

number

number

number

number

[0071] PL D is the downlink path loss estimate in dB calculated by the transmitting UE using the RS in the active downlink BWP, which is the same as the downlink path loss estimate in the PUSCH power control equation, except that: (1) the RS resource is the one that the UE uses to determine the power of PUSCH transmission scheduled by DCI format 0_0 in serving cell c if the UE is configured to monitor the PDCCH for detection of DCI format 0_0 in serving cell c, and (2) the RS resource corresponds to the SS / PBCH block that the UE uses to acquire the MIB if the UE is not configured to monitor the PDCCH for detection of DCI format 0_0 in serving cell c.

[0072] If sl-P0-PRS is provided,

number

number

number

number

number

[0073] If the SCI format for scheduling an SL-PRS transmission includes a cast type indicator field indicating unicast,

number

number

number

number

[0074] If the SCI format for scheduling an SL-PRS transmission includes a cast type indicator field indicating groupcast or broadcast,

number

number

number

number

number

[0075] If the weight corresponding to the maximum unicast sidelink path loss estimate is set to 1,

number

number

[0076] (Closed loop power control in SL-PRS power control system)

[0077] In the above solution, the SL-PRS transmit power is based on open-loop power control. For more flexible control of the SL-PRS transmit power, closed-loop power control is introduced into the SL-PRS power control equation.

[0078] For SL-PRS transmission, the UE uses power P SL-PRS (i) is determined as follows:

number

number

number

[0079] If sl-MaxTxPower-PRS is provided,

number

[0080] The priority of the SL-PRS is indicated by a priority indicator, which is an integer value selected from 1 to 8. The priority indicator of the SL-PRS is configured in each SL-PRS configuration indicated by the SCI. In some embodiments, the anchor UE may transmit the SCI to the target UE.

[0081] The SL-PRS CBR measured in slot n is defined as the portion of SL-PRS subchannels in the SL-PRS resource pool whose RSSI measured by the UE exceeds a (pre-)configured threshold sensed over the SL-PRS CBR measurement window [na,n-1], according to the higher layer parameter l-TimeWindowSizeCBR-PRS, where a is equal to 100 or 100·2μslots.

[0082] The priority indicator of the SL-PRS indicated by the SCI and the SL-PRS CBR measured by the transmitting UE.

number

number

number

[0083] If sl-MaxTxPower-PRS is not provided and sl-MaxTxPower is provided,

number

number

number

number

[0084] If both sl-MaxTxPower-PRS and sl-MaxTxPower are not provided,

number

[0085] If dl-P0-PRS is provided,

number

number

number

number

number

number

number

number

number

[0086] If sl-P0-PRS is provided,

number

number

number

number

number

[0087] If the SCI format for scheduling an SL-PRS transmission includes a cast type indicator field indicating unicast,

number

number

number

number

[0088] If the SCI format for scheduling an SL-PRS transmission includes a cast type indicator field indicating groupcast or broadcast,

number

number

number

number

number

number

number

[0089] Therefore, the SL-PRS transmission power is more accurate due to the introduction of closed-loop power control. SL is configured with DCI 3-0 and is only suitable for mode 1 in sidelink. SL Another way to configure f SL This is shown by the SCI. Thus, the adjustment factor f SL may be suitable for both mode 1 and mode 2.

[0090] (1 offset for SL-PRS power control based on PSSCH power control)

[0091] In some embodiments, only one offset is introduced for the SL-PRS transmit power to the SL-PRS power control based on the PSSCH power control. For example, the UE may set the SL-PRS transmit power P SL-PRS (i) is determined as follows:

number

[0092] The CBR measured in slot n is defined as the portion of subchannels in the resource pool whose SL RSSI measured by the UE exceeds the (pre)configured threshold sensed over the CBR measurement window [na,n-1], according to the higher layer parameter sl-TimeWindowSizeCBR, where a is equal to 100 or 100·2μslots.

[0093] If dl-P0-PSSCH-PSCCH is provided,

number

number

number

number

number

number

[0094] If sl-P0-PSSCH-PSCCH is provided,

number

number

[0095] If the SCI format for scheduling the SL-PRS transmission includes a cast type indicator field indicating unicast, SLis the unicast sidelink path loss estimate (dB) calculated by the transmitting UE using the reference signal. The unicast sidelink path loss estimate is then

number

number

number

[0096] If the SCI format that schedules the SL-PRS transmission includes a cast type indicator field indicating groupcast or broadcast, the PL SL is the groupcast / broadcast sidelink pathloss estimate in dB calculated by the transmitting UE using the reference signal. The groupcast / broadcast sidelink pathloss estimate is then the weighted sum of all unicast sidelink pathloss estimates between the transmitting UE and the target UE, i.e.

number

number

number

number

number

number

[0097] Δ SL-PRS depends on the priority indicator of the SL-PRS

number

[0098] Therefore, only one offset is introduced based on the priority indicator of the SL-PRS. Although the compensation between the SL-PRS transmit power and the PSSCH power control is coarse, the overhead for configuring the offset is low. By adjusting the offset, the SL-PRS transmit power can be changed in time, which facilitates reducing the latency of positioning. Designing the SL-PRS power control separately from the PSSCH transmit power control is also beneficial in improving the positioning accuracy.

[0099] (

number

[0100] Parameters in SL-PRS power control formula

number

number

number

[0101] If sl-MaxTxPower-PRS is not provided and sl-MaxTxPower is provided,

number

[0102] a0, a1 and a2 are positive numbers. They may be greater than or less than 1. If a0 / a1 / a2 is greater than 1, it is the corresponding

number

number

[0103] If both sl-MaxTxPower-PRS and sl-MaxTxPower are not provided,

number

[0104] b0, b1, and b2 are positive numbers less than 1, and the values ​​can be determined by the transmitting UE.

number

[0105] If sl-MaxTxPower-PRS is not provided and sl-MaxTxPower is provided,

number

[0106] c0, c1 and c2 are positive numbers. They may be greater than or less than 1. If c0 / c1 / c2 is greater than 1, it means that the corresponding

number

number

[0107] If both sl-MaxTxPower-PRS and sl-MaxTxPower are not provided,

number

[0108] d0, d1, and d2 are positive numbers and less than 1, and the values ​​can be determined by the transmitting UE.

[0109] In some embodiments, some offsets for SL-PRS power control based on the PSSCH power control formula can be introduced. The offsets and priorities of SL-PRS are defined. SL-PRS power control in groupcast and broadcast can be used.

[0110] In some embodiments, a power control formula and related parameters for SL-PRS power control can be designed. For example, the priority of SL-PRS CBR and SL-PRS is defined. SL-PRS power control in groupcast and broadcast can also be used.

[0111] In some embodiments, closed loop power control of the SL-PRS power control formula may be used. The priority and related parameters of the SL-PRS CBR and SL-PRS in the SL-PRS power control formula are defined. SL-PRS power control in groupcast and broadcast may also be used. Two adjustment factors are defined for the closed loop power control.

[0112] In some embodiments, only one offset for SL-PRS power control based on the PSSCH power control formula may be used. The offset and priority of the SL-PRS are defined. SL-PRS power control in groupcast and broadcast may also be used.

[0113] Parameters in SL-PRS power control formula

number

[0114] 7 to 11 show example flowcharts of wireless communication processes according to some configurations. Although each of the flowcharts shows a certain order, the arrangement is not limited thereto, and the order of operations of each process may be changed in an appropriate manner.

[0115] 3 illustrates a flow chart of an example wireless communication process 300 according to some configurations. The process 300 is performed by a UE (e.g., an anchor UE). The process 300 includes determining (302) a power and transmitting (304) a positioning reference signal having the power in a sidelink communication to a second wireless communication device (e.g., a target UE). The power is determined based on one or more sidelink parameters related to a priority level associated with the positioning reference signal.

[0116] 4 illustrates a flow chart of an example wireless communication process 400 according to some configurations. The process 400 is performed by a UE (e.g., an anchor UE). The process 400 includes determining (402) a power and transmitting (404) a positioning reference signal having the power in a sidelink communication to a second wireless communication device (e.g., a target UE). The power is determined based on one or more sidelink parameters related to a priority level associated with the positioning reference signal. The one or more sidelink parameters may include parameters

number

number

number

number

[0117] 5 shows a flow chart of an example wireless communication process 500 according to some configurations. The process 500 is performed by a UE (e.g., an anchor UE). The process 500 includes determining (502) a power and transmitting (504) a positioning reference signal having the power in a sidelink communication to a second wireless communication device (e.g., a target UE). The power is determined based on one or more sidelink parameters related to a priority level associated with the positioning reference signal. The one or more sidelink parameters may include parameters

number

number

number

number

number

number

[0118] FIG. 6 illustrates a flow chart of an example wireless communication process 600 according to some configurations. The process 600 is performed by a UE (e.g., an anchor UE). The process 600 includes determining (602) a power and transmitting (604) a positioning reference signal having the power in a sidelink communication to a second wireless communication device (e.g., a target UE). The power is determined based on one or more sidelink parameters related to a priority level associated with the positioning reference signal. The one or more sidelink parameters may include parameters

number

number

number

number

number

[0119] Although various arrangements of the present solution have been described above, it should be understood that they are presented only as examples and not as limitations. Similarly, various figures may depict example architectures or configurations provided to enable a person skilled in the art to appreciate example features and functionality of the present solution. However, such a person may appreciate that the solution is not limited to the example architectures or configurations depicted, but may be implemented using various alternative architectures and configurations. Furthermore, as will be appreciated by a person skilled in the art, one or more features of one configuration may be combined with one or more features of another configuration described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the example arrangements described above.

[0120] It is also understood that any reference to an element herein using a designation such as "first," "second," etc., does not generally limit the quantity or order of those elements. Rather, these designations may be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to a first and a second element does not imply that only two elements may be used or that the first element must precede the second element in any way.

[0121] Moreover, as will be appreciated by those skilled in the art, information and signals may be represented using any of a variety of different technologies and techniques. For example, the data, instructions, commands, information, signals, bits, and symbols that may be referred to in the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0122] Moreover, as will be appreciated by those skilled in the art, any of the various exemplary logic blocks, modules, processors, means, circuits, methods, and functions described in connection with the aspects disclosed herein may be implemented by electronic hardware (e.g., digital implementations, analog implementations, or a combination of the two), firmware, various forms of programs or design codes incorporating instructions (which may be conveniently referred to herein as "software" or "software modules"), or any combination of these technologies. To clearly illustrate this interchangeability of hardware, firmware, and software, various exemplary components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software, or a combination of these techniques, depends on the particular application and design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in various ways for each particular application, but such implementation decisions do not depart from the scope of this disclosure.

[0123] Moreover, as will be appreciated by those skilled in the art, the various exemplary logic blocks, modules, devices, components, and circuits described herein may be implemented in or executed by an integrated circuit (IC), which may include a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, or any combination thereof. The logic blocks, modules, and circuits may further include an antenna and / or a transceiver for communicating with various components in a network or device. The general purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a DSP core, or any other suitable configuration for performing the functions described herein.

[0124] If implemented in software, the functions can be stored as one or more instructions or codes on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media includes both computer storage media and communication media, including any medium that can enable a computer program or code to be transferred from one place to another. A storage medium can be any available medium that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.

[0125] As used herein, the term "module" refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Moreover, for purposes of discussion, the various modules are described as individual modules. However, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs associated functions in accordance with the configuration of the present solution.

[0126] Furthermore, memory or other storage devices, as well as communication components, may be used in the configuration of the solution. It may be appreciated that for clarity, the above description has described the configuration of the solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the solution. For example, functions shown to be performed by separate processing logic elements or controllers may be performed by the same processing logic element or controller. Thus, references to specific functional units are merely to suitable means for providing the described functionality, rather than to a strict logical or physical structure or organization.

[0127] Various modifications to the configurations described in this disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other configurations without departing from the scope of this disclosure. Thus, the present disclosure is not intended to be limited to the configurations shown herein, but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as set forth in the following claims.

Claims

1. A wireless communication method, the wireless communication method comprising: determining, by a first wireless communication device, a power; transmitting, by the first wireless communication device, a positioning reference signal having the power to a second wireless communication device in a sidelink communication; Including, 4. The method of claim 3, wherein the power is determined based on one or more sidelink parameters related to a priority level associated with the positioning reference signal.

2. 2. The wireless communication method of claim 1, wherein the one or more sidelink parameters also relate to capacity, path loss, and channel busy ratio (CBR).

3. The one or more sidelink parameters may have the following offset: [Number 329] or [Number 330] and The above parameters [Number 331] , P ＭＡＸ、ＣＢＲ represents an offset to [Number 333] teeth, [Number 334] , and the parameter P ＭＡＸ、ＣＢＲ represents the sidelink maximum transmission power of the first wireless communication device based on the CBR, and the parameter P ＳＬ－ＰＲＳ，Ｄ (i) represents the power based on the downlink path loss of the transmission opportunity of the positioning reference signal, and the parameter P ＳＬ－ＰＲＳ，ＳＬ 2. The wireless communication method of claim 1, wherein (i) represents a power based on a sidelink path loss of the transmission opportunity of the positioning reference signal.

4. The offset [Number 338] and the offset [Number 339] The wireless communication method of claim 3 , wherein each of the priority levels is determined based on the priority level of the positioning reference signal.

5. 5. The method of claim 4, wherein the priority level for the transmission opportunity of the positioning reference signal is one of a plurality of integers indicated in sidelink control information (SCI).

6. The parameter P ＳＬ－ＰＲＳ，Ｄ (i) represents the number of resource blocks of the transmission opportunity of the positioning reference signal. [Number 341] The wireless communication method of claim 3 , wherein the selected signal is selectively determined based on:

7. The parameter P ＳＬ－ＰＲＳ，ＳＬ (i) represents a sidelink path loss estimate for at least one of unicast, groupcast, or broadcast; ＳＬ and for the groupcast and broadcast, the parameter PL ＳＬ 4. The wireless communication method of claim 3, wherein: σ is a weighted sum of multiple unicast sidelink path loss estimates between the first wireless communication device and the second wireless communication device.

8. The one or more sidelink parameters may be [Number 345] Including, The above parameters [Number 346] 2. The wireless communication method of claim 1, wherein: Δx represents a sidelink maximum transmit power for the first wireless communication device based on the CBR for transmitting the positioning reference signal.

9. The above parameters [Number 347] is the following parameter: sl-MaxTxPower, sl-MaxTxPower-PRS, or P ＣＭＡＸ The method of claim 8, wherein the determination is made by at least one of:

10. determining, by the first wireless communication device, that the parameter sl-MaxTxPower-PRS is provided by a higher layer; The first wireless communication device determines the priority level of the positioning reference signal and the CBR range for the positioning reference signal by the parameter sl-MaxTxPower-PRS. [Number 349] To determine The wireless communication method of claim 9 , further comprising:

11. 11. The method of claim 10, wherein the priority level for the transmission opportunity is indicated by one of a plurality of integers indicated in sidelink control information (SCI).

12. The above parameters [Number 350] The wireless communication method of claim 10 , wherein σ decreases as the CBR within the CBR range increases and σ increases as the priority level increases.

13. determining, by the first wireless communication device, that the parameter sl-MaxTxPower is provided by a higher layer and that the parameter sl-MaxTxPower-PRS is not provided; The first wireless communication device transmits the parameter [Number 351] of [Number 352] To decide as Further comprising: The parameter P ＭＡＸ、ＣＢＲ represents the CBR-based sidelink maximum transmission power of the first wireless communication device, and the offset [Number 354] is the parameter P ＭＡＸ、ＣＢＲ 10. The wireless communication method of claim 9, wherein the offset is an offset to

14. The above parameters [Number 356] The wireless communication method of claim 13 , wherein a priority level of the positioning reference signal is determined based on the priority level of the positioning reference signal.

15. 15. The method of claim 14, wherein the priority level for the transmission opportunity of the positioning reference signal is one of a plurality of integers indicated in sidelink control information (SCI).

16. determining that neither the parameter sl-MaxTxPower nor the parameter sl-MaxTxPower-PRS is provided by the first wireless communication device; The first wireless communication device transmits the parameter [Number 357] of [Number 358] To decide as The wireless communication method of claim 9 , further comprising:

17. The step of determining power comprises: The first wireless communication device detects a parameter P ＳＬ－ＰＲＳ，Ｄ (i) and P ＳＬ－ＰＲＳ，ＳＬ determining the power based on determining (i); The parameter P ＳＬ－ＰＲＳ，Ｄ (i) represents the power based on the downlink path loss of the transmission opportunity of the positioning reference signal, and the parameter P ＳＬ－ＰＲＳ，ＳＬ 9. The wireless communication method of claim 8, wherein (i) represents a power based on a sidelink path loss of the transmission opportunity of the positioning reference signal.

18. The parameter P ＳＬ－ＰＲＳ，Ｄ (i) is [Number 364] and [Number 365] and the parameter [Number 366] represents the expected power of the second wireless communication device, said parameter [Number 367] 20. The wireless communication method of claim 17, wherein: represents a downlink path loss coefficient.

19. The parameter P ＳＬ－ＰＲＳ，ＳＬ (i) represents a sidelink path loss estimate for at least one of unicast, groupcast, or broadcast; ＳＬ and for the groupcast and broadcast, the parameter PL ＳＬ 20. The wireless communication method of claim 17, wherein: σ is a weighted sum of multiple unicast sidelink path loss estimates between the first wireless communication device and the second wireless communication device.

20. The parameter P ＳＬ－ＰＲＳ，ＳＬ (i) is [Number 372] and [Number 373] and the parameter [Number 374] represents the expected power of the second wireless communication device, said parameter [Number 374-1] 20. The wireless communication method of claim 19, wherein: σ represents a sidelink path loss factor.

21. The one or more sidelink parameters may be adjusted by the following adjustment factor: Ｄ Or f ＳＬ and The adjustment coefficient f Ｄ is the parameter P ＳＬ－ＰＲＳ，Ｄ represents a closed loop adjustment factor for (i), said adjustment factor f ＳＬ is the parameter P ＳＬ－ＰＲＳ，ＳＬ 20. The wireless communication method of claim 17, wherein the step of: (i) represents a closed loop adjustment factor.

22. The adjustment coefficient f Ｄ and the adjustment factor f ＳＬ 22. The wireless communication method of claim 21 , wherein:

23. The one or more sidelink parameters may further comprise: [Number 383] A single offset Δ ＳＬ－ＰＲＳ 20. The wireless communication method of claim 17, comprising:

24. The offset Δ ＳＬ－ＰＲＳ The wireless communication method of claim 23 , wherein is determined based on the priority level of the positioning reference signal.

25. 25. The wireless communication method of claim 24, wherein the priority level for the transmission opportunity of the positioning reference signal is one of a plurality of integers indicated in sidelink control information (SCI).

26. The above parameters [Number 386] The wireless communication method of claim 8 , wherein the is configured by at least one of a higher layer, a base station, or a core network.

27. The above parameters [Number 387] The wireless communication method of claim 8 , wherein: is determined based on the CBR for the positioning reference signal.

28. The above parameters [Number 388] The wireless communication method of claim 8 , wherein: is determined based on a channel priority associated with the positioning reference signal.

29. A wireless communication method, the wireless communication method comprising: receiving, by the second wireless communication device, a positioning reference signal having power from the first wireless communication device in a sidelink communication; 4. The method of claim 3, wherein the power is determined by the first wireless communication device based on one or more sidelink parameters related to a priority level associated with the positioning reference signal.

30. 29. A wireless communication device comprising a processor and a memory, the processor configured to read a code from the memory and to perform a method according to any one of claims 1 to 28.

31. 29. A computer program product comprising a computer readable program medium having stored thereon code which, when executed by a processor, causes the processor to perform a method according to any one of claims 1 to 28.

Images