Transmission Power Control Mode Selection

Abstract

Certain aspects of the present disclosure provide techniques for allocating or adjusting parameters of a transmit power control mode or transmit power used in sidelink communication at a user equipment. In some examples, the present disclosure describes determining that a user equipment (UE) is connected to a BS, and based on the BS being located indoors, configuring the UE to use a first transmit power control mode for determining a transmit power for transmitting wireless data over a sidelink.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Application No. 16 / 934,720, filed on July 21, 2020, which claims priority to U.S. Provisional Application No. 62 / 880,048, filed on July 29, 2019, both of which are assigned to the assignee of the present application and are hereby expressly incorporated herein by reference in their entirety, as fully set forth below and for all applicable purposes. Technical Field

[0003] Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for selecting a transmit power control mode for controlling transmitter power in sidelink communications. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcast, etc. These wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access systems include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, to name a few.

[0005] In some examples, a wireless multiple access communication system may include multiple base stations (BSs), each of which is capable of simultaneously supporting communications for multiple communication devices (also referred to as user equipment (UE)). In an LTE or LTE-A network, a set of one or more base stations may define an evolved Node B (eNB). In other examples (e.g., in a next generation, new radio (NR) or 5G network), a wireless multiple access communication system may include multiple distributed units (DUs) (e.g., edge units (EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs), transmit receive points (TRPs), etc.) communicating with multiple central units (CUs) (e.g., central nodes (CNs), access node controllers (ANCs), etc.), wherein a set of one or more DUs communicating with a CU may define an access node (e.g., which may be referred to as a BS, a 5G NB, a next generation Node B (gNB or gNodeB), a TRP, etc.). A BS or DU may communicate with a set of UEs on downlink channels (eg, for transmissions from the BS or DU to the UEs) and uplink channels (eg, for transmissions from the UEs to the BS or DU).

[0006] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. New radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is an enhancement set to the LTE mobile standard released by 3GPP. NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using OFDMA with cyclic prefix (CP) on the downlink (DL) and on the uplink (UL), thereby better supporting mobile broadband Internet access. To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0007] However, as the demand for mobile broadband access continues to grow, there is a need for further improvements to NR and LTE technologies. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ them. Summary of the invention

[0008] The systems, methods, and devices of the present disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of the present disclosure as expressed by the appended claims, some features will now be briefly discussed. After considering this discussion, and particularly after reading the section entitled "Detailed Description," it will be understood how the features of the present disclosure provide advantages, including improved communication between access points and stations in a wireless network.

[0009] Certain aspects provide a method for wireless communication by a base station. The method generally includes determining a location of a user equipment (UE), selecting one of a first transmit power control mode or a second transmit power control mode for determining a transmit power for transmitting wireless data via a side link based on the determined location of the UE, and configuring the UE to use the selected one of the first transmit power control mode or the second transmit power control mode.

[0010] Certain aspects provide a method for wireless communications by a user equipment (UE). The method generally includes: sending a signal to a second UE via a sidelink, receiving a report from the second UE indicating a measurement of a signal received by the second UE, determining whether the measurement satisfies a threshold, and based on the determination of whether the measurement satisfies the threshold, selecting one of: (i) a power control mode for determining a transmit power for sending wireless data via the sidelink, or (ii) a transmit power level for sending wireless data via the sidelink.

[0011] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes a processor and a memory communicatively coupled to the processor, wherein the processor is configured to: determine that a UE is connected to a BS, and based on the BS being located indoors, configure the UE to use a first transmit power control mode for determining transmit power for transmitting wireless data over a sidelink.

[0012] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes a processor and a memory communicatively coupled to the processor, wherein the processor is configured to: determine a location of a user equipment (UE), select one of a first transmit power control mode or a second transmit power control mode for determining a transmit power for transmitting wireless data via a sidelink based on the determined location of the UE, and configure the UE to use the selected one of the first transmit power control mode or the second transmit power control mode.

[0013] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes a processor and a memory communicatively coupled to the processor, wherein the processor is configured to: send a signal to a second UE via a sidelink, receive a report from the second UE indicating a measurement of a signal received by the second UE, determine whether the measurement satisfies a threshold, and based on the determination of whether the measurement satisfies the threshold, select one of: (i) a power control mode for determining a transmit power for sending wireless data via the sidelink, or (ii) a transmit power level for sending wireless data via the sidelink.

[0014] Aspects of the present disclosure provide components, apparatus, processors, and computer-readable media for performing the methods described herein.

[0015] Aspects of the present disclosure provide components, apparatuses, processors, and computer-readable media for performing techniques and methods that may be supplemental to the operations of a UE described herein (eg, performed by a BS).

[0016] To achieve the aforementioned and related purposes, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail certain illustrative features of one or more aspects. However, these features indicate only a few of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order that the manner in which the above-mentioned features of the present disclosure are understood in detail, a more particular description of what has been briefly summarized above may be made by reference to various aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the accompanying drawings illustrate only certain typical aspects of the present disclosure and are therefore not to be considered limiting of its scope, as the description may admit of other equally effective aspects.

[0018] Figure 1 is a block diagram conceptually illustrating an example telecommunications system in accordance with certain aspects of the present disclosure.

[0019] Figure 2 Example components of a BS and a UE are shown that can be used to implement aspects of the present disclosure.

[0020] Figure 3 is a diagram illustrating an example of a base station (BS) communicating with one or more user equipments (UEs) in accordance with certain aspects of the present disclosure.

[0021] Figure 4 is a diagram illustrating an example frame format for NR in accordance with certain aspects of the present disclosure.

[0022] Figure 5 is a diagram illustrating an example scenario for adjusting a transmit power control mode for controlling a sidelink transmit power level at a UE based on a base station configuration, in accordance with certain aspects of the present disclosure.

[0023] Figure 6 is a diagram illustrating an example scenario for adjusting a transmit power control mode for controlling a sidelink transmit power level based on UE positioning in accordance with certain aspects of the present disclosure.

[0024] Figure 7 is a diagram illustrating example scenarios for adjusting a transmit power control mode for controlling a sidelink transmit power level based on signal measurements in accordance with certain aspects of the present disclosure.

[0025] Figure 8is a flow diagram illustrating example operations for wireless communications at a BS in accordance with certain aspects of the present disclosure.

[0026] Fig. 9 is a flow diagram illustrating example operations for wireless communications at a BS in accordance with certain aspects of the present disclosure.

[0027] Fig.10 is a flow diagram illustrating example operations for wireless communications at a UE in accordance with certain aspects of the present disclosure.

[0028] Fig.11 A communications device according to aspects of the present disclosure is shown that may include various components configured to perform operations for the techniques disclosed herein.

[0029] Fig.12 A communications device according to aspects of the present disclosure is shown that may include various components configured to perform operations for the techniques disclosed herein.

[0030] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation. DETAILED DESCRIPTION

[0031] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for selecting a transmit power control mode for controlling transmitter power of a user equipment (UE) in sidelink communications.

[0032] New Radio (NR) provides for limiting base station (BS) transmit power levels (e.g., effective isotropic radiated power (EIRP) levels) based on BS implementation. In one example, the deployment configuration of the BS can be a determining factor in the transmit power limit of the BS. More specifically, certain examples provide for limiting the transmit power level (e.g., maximum transmit power level and / or acceptable range of transmit power) based on whether the BS is located indoors or outdoors. Such limitations help conserve power and reduce interference to other signals by limiting the transmit power level to a specific range. For example, the maximum transmit power of an indoor BS can be lower than the maximum transmit power of an outdoor BS due to a variety of factors, including: proximity to people, electrostatic environment characteristics, signal reflections, and signal interference. Therefore, the indoor / outdoor implementation of the BS can determine the transmit power level of the BS to provide an ideal level.

[0033] Similarly, the transmit power level of the UE is also limited. However, in some cases, the limitation includes more than just a range of power levels or a maximum power level. Alternatively, the transmit power limit of the UE can be controlled by an open-loop and / or closed-loop power level control mode.

[0034] Conventionally, the transmit power level control mode of a UE is not determined based on whether the UE is indoors or outdoors, and thus any transmit power level of the UE is not determined with respect to the UE positioning. Therefore, in order to conserve power and reduce interference to other signals, it is desirable to adjust the power level control mode of the UE according to one or more of the following: the positioning of the UE, the positioning of the BS serving the UE, and / or one or more signal measurements between the UE and another UE in sidelink communication.

[0035] The following description provides examples without limiting the scope, applicability or examples set forth in the claims. Without departing from the scope of the present disclosure, changes may be made to the functions and arrangements of the elements discussed. Various processes or components may be omitted, replaced or added to each example as appropriate. For example, the method described may be performed in an order different from the order described, and various steps may be added, omitted or combined. In addition, the features described with respect to some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement a device or implement a method. In addition, the scope of the present disclosure is intended to cover such devices or methods implemented using other structures, functions or structures and functions together with the various aspects of the present disclosure set forth herein, or in place of the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein may be embodied by one or more elements of the claims. The word "exemplary" is used herein to mean "used as an example, instance or illustration". Any aspect described as "exemplary" herein is not necessarily to be interpreted as being preferred or superior to other aspects.

[0036] The techniques described herein can be used for various wireless communication technologies, such as 3GPP Long Term Evolution (LTE), LTE-Advanced (LTE-A), 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), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably.

[0037] A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA2000, etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. CDMA2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network may implement a radio technology such as NR (e.g. 5G-RA), Evolved UTRA (e-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the 3rd Generation Partnership Project (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2).

[0038] NR is an emerging wireless communication technology under development in conjunction with the 5G Technology Forum (5GTF). NR access (e.g., 5GNR) can support a variety of wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80MHz or above), millimeter wave (mmW) targeting high carrier frequency (e.g., 25GHz or above), massive machine type communication MTC (mMTC) targeting non-backward compatible MTC technology, and / or mission-critical targeting ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTIs) to meet corresponding quality of service (QoS) requirements. In addition, these services can coexist in the same subframe.

[0039] The techniques described herein can be used for the wireless networks and radio technologies described above as well as other wireless networks and radio technologies. For clarity, although various aspects may be described herein using terms typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied to communication systems based on other generations, such as 5G and beyond (including NR technologies).

[0040] Figure 1 An example wireless communication network 100 is shown in which aspects of the present disclosure may be performed. For example, the wireless communication network 100 may be a NR system (e.g., a 5G NR network). Figure 1As shown in , BS 110a has a power control mode module 142. According to various aspects described herein, the power control mode module 142 can be configured to select a transmit power control mode and / or one or more transmit power parameters for use by the UE in sidelink communication, and to assign the selected transmit power control mode and transmit power parameters to the UE by sending a signal indicating the selected transmit power control mode to the UE. In addition, as Figure 1 As shown in the figure, UE 120a has a power control mode module 140. According to various aspects described herein, the power control mode module 140 can be configured to receive an indication of a transmit power control mode and / or one or more transmit power parameters for use in sidelink communication, and select the transmit power control mode and / or one or more transmit power parameters based on a received signal measurement report.

[0041] like Figure 1 As shown in , the wireless communication network 100 may include multiple base stations (BS) 110 and other network entities. A BS may be a station that communicates with a user equipment (UE). Each BS 110 may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a node B (NB) and / or a NB subsystem serving the coverage area, depending on the context in which the term is used. In the NR system, the terms "cell" and BS, next generation node B (gNB or gNodeB), access point (AP), distributed unit (DU), carrier or transmit receive point (TRP) may be used interchangeably. In some examples, the cell is not necessarily stationary, and the geographical area of ​​the cell may move according to the location of the mobile BS. In some examples, the BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless communication network 100 via various types of backhaul interfaces (such as direct physical connections, wireless connections, virtual networks, or interfaces using any suitable transport networks).

[0042] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, subcarrier, frequency channel, tone, subband, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0043] A BS may provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown, BSs 110a, 110b, and 110c may be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS for pico cell 102x. BSs 110y and 110z may be femto BSs for femto cells 102y and 102z, respectively. A BS may support one or more (e.g., three) cells.

[0044] The wireless communication network 100 may also include a relay station. A relay station is a station that receives data transmissions and / or other information from an upstream station (e.g., a BS or a UE) and sends data transmissions and / or other information to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that relays transmissions for other UEs. Figure 1 In the illustrated example, a relay station 110r may communicate with a BS 110a and a UE 120r to facilitate communication between the BS 110a and the UE 120r. A relay station may also be referred to as a relay BS, a relay, or the like.

[0045] The wireless communication network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relays, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless communication network 100. For example, a macro BS may have a high transmit power level (e.g., 20 watts), while a pico BS, a femto BS, and a relay may have a low transmit power level (e.g., 1 watt).

[0046] The wireless communication network 100 may support synchronous operation or asynchronous operation. For synchronous operation, the BSs may have similar frame timing, and transmissions from different BSs may be roughly aligned in time. For asynchronous operation, the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time. The techniques described herein may be used for both synchronous and asynchronous operation.

[0047] A network controller 130 may be coupled to a set of BSs and provide coordination and control for these BSs. The network controller 130 may communicate with the BSs 110 via a backhaul. The BSs 110 may also communicate with each other (eg, directly or indirectly) via a wireless or wired backhaul.

[0048] UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE may be stationary or mobile. A UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a customer premises equipment (CPE), a cellular phone, a smart phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor / device, a wearable device (such as a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet, etc.)), an entertainment device (e.g., a music device, a video device, a satellite radio, etc.), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium. Some UEs may be considered as machine type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a BS, another device (e.g., a remote device), or some other entity. For example, a wireless node may provide connectivity to or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0049] Some wireless networks, such as LTE, utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, frequencies, etc. Each subcarrier can be modulated with data. Typically, modulation symbols are sent in the frequency domain using OFDM, and in the time domain using SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the spacing of the subcarriers can be 15kHz, and the minimum resource allocation (called a "resource block" (RB)) can be 12 subcarriers (or 180kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), the nominal fast Fourier transform (FFT) size can be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth can also be divided into subbands. For example, a subband can cover 1.08MHz (e.g., 6 RBs), and for a system bandwidth of 1.25, 2.5, 5, 10, or 20MHz, there can be 1, 2, 4, 8, or 16 subbands, respectively. In LTE, the basic transmission time interval (TTI) or packet duration is a 1ms subframe. In NR, the subframe is still 1ms, but the basic TTI is called a time slot. Depending on the subcarrier spacing, the subframe contains a variable number of time slots (e.g., 1, 2, 4, 8, 16...time slots). NR RB is 12 consecutive frequency subcarriers. NR can support a basic subcarrier spacing of 15kHz, and other subcarrier spacings can be defined relative to the basic subcarrier spacing, for example, 30kHz, 60kHz, 120kHz, 240kHz, etc. Symbol and slot lengths scale with the subcarrier spacing. The CP length also depends on the subcarrier spacing.

[0050] NR may utilize OFDM with CP on both the uplink and downlink, and may include support for half-duplex operation using time division duplex (TDD). Beamforming may be supported, and the beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported. In some examples, the MIMO configuration in the DL may support up to 8 transmit antennas, with multi-layer DL transmissions of up to 8 streams and up to 2 streams per UE. In some examples, multi-layer transmissions of up to 2 streams per UE may be supported. Multi-cell aggregation of up to 8 serving cells may be supported.

[0051] In some examples, access to the air interface can be scheduled. The scheduling entity (e.g., BS) allocates resources for communication between some or all devices and equipment within its service area or cell. The scheduling entity can be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, subordinate entities utilize resources allocated by the scheduling entity. The BS is not the only entity that can be used as a scheduling entity. In some examples, a UE can be used as a scheduling entity, and resources can be scheduled for one or more subordinate entities (e.g., one or more other UEs), and other UEs can utilize the resources scheduled by the UE for wireless communication. In some examples, a UE can be used as a scheduling entity in a peer-to-peer (P2P) network and / or a mesh network. In the mesh network example, UEs can communicate directly with each other in addition to communicating with the scheduling entity.

[0052] In some examples, two or more slave entities (e.g., UEs) can communicate with each other using sidelink signals. Real-world applications of such sidelink communications may include public safety, short-range services, UE-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Things (IoE) communications, IoT communications, mission-critical networks, and / or various other suitable applications. Generally, a sidelink signal may refer to a signal communicated from one slave entity (e.g., UE1) to another slave entity (e.g., UE2) without relaying the communication through a scheduling entity (e.g., UE or BS), even though the scheduling entity may be used for scheduling and / or control purposes. In some examples, sidelink signals may communicate using licensed spectrum (unlike wireless local area networks that typically use unlicensed spectrum).

[0053] In some examples of the wireless communication network 100, sidelink communications can be established between UEs without having to rely on UE IDs or control information from a BS. For example, if UE 120c is out of range of cell 102a, UE 120c can initiate sidelink communications with UE 120d or UE 120a without relying on a direct connection to a BS (e.g., BS 110a). Any UE (120a–120d) can be used as a scheduling entity or a master sidelink device, while another UE can be used as a slave entity or a non-master (e.g., auxiliary) sidelink device. In addition, the UE (120a–120d) can be configured to perform beam management procedures for the sidelink. Thus, one or more UEs can initiate and / or schedule certain beam management procedures as scheduling entities in a device-to-device (D2D), peer-to-peer (P2P), or vehicle-to-vehicle (V2V) network and / or in a mesh network.

[0054] exist Figure 1In FIG. 1 , a solid line with double arrows indicates desired transmissions between a UE and a serving BS, which is a BS designated to serve the UE on the downlink and / or uplink. A thin dashed line with double arrows indicates potentially interfering transmissions between a UE and a BS.

[0055] In certain aspects, UE 120 (e.g., 120a–120d) may have circuitry and processing resources capable of obtaining a position fix or position-related measurements. Position-related measurements performed by UE 120 may include measurements of signals received from satellites belonging to a satellite positioning system (SPS) or a global navigation satellite system (GNSS), such as the Global Positioning System (GPS), the Global Navigation Satellite System (GLONASS), Galileo, or BeiDou, or any other suitable local or regional SPS, such as the Indian Regional Navigation Satellite System (IRNSS), the European Geostationary Navigation Overlay Service (EGNOS), or the Wide Area Augmentation System (WAAS). Position-related measurements performed by UE 120 may include measurements of signals received from a ground-based transmitter fixed at a known location, such as, for example, BS 110.

[0056] UE 120 or a separate location server with a location management function (LMF) to which UE 120 may send measurements may then obtain a position estimate for UE 120 based on these position-related measurements using any of a number of UE-based and / or UE-assisted positioning methods such as, for example, GNSS, Assisted GNSS (A-GNSS), Advanced Forward Link Trilateration (AFLT), Observed Time Difference of Arrival (OTDOA), Wireless Local Area Network (WLAN) (also known as WiFi) positioning, or Enhanced Cell ID (ECID), or a combination thereof. In some of these techniques (e.g., A-GNSS, AFLT, and OTDOA), pseudoranges or timing differences may be measured at UE 120 relative to three or more ground-based transmitters (e.g., BS 110) fixed at known locations, or relative to four or more satellites with accurate known orbit data, or a combination thereof, based at least in part on pilots, positioning reference signals (PRS), or other positioning-related signals transmitted by transmitters or satellites and received at UE 120. Note that the location server may include LMF, evolved serving mobile location center (eSMLC), etc.

[0057] For example, using a UE-assisted positioning method, the first UE 120a can perform location measurements (e.g., measurements of received signal strength indication (RSSI), round-trip signal propagation time (RTT), reference signal time difference (RSTD), reference signal received power (RSRP), and / or reference signal received quality (RSRQ) of an access link and / or side link) and send the measurements to the BS 110a or the second UE 120b to calculate a position estimate of the first UE 120a.

[0058] Using a UE-based positioning method, UE 120 can obtain position measurements (e.g., which can be the same or similar to position measurements of a UE-assisted positioning method) and can calculate its own position (e.g., with the help of assistance data received from a location server with LMF or eSMLC or broadcast by BS 110). Using a network-based positioning method, one or more BSs (e.g., 110a–110c) can obtain position measurements (e.g., measurements of RSSI, RTT, RSRP, RSRQ, or time of arrival (TOA) (e.g., time difference of arrival (TDOA)), etc.) of signals sent by UE 120) and / or can receive measurements obtained by UE 120 and can send the measurements to a location server with LMF to calculate a position estimate for UE 120.

[0059] Figure 2 1 and 120 (eg, in a BS 110 and a UE 120) that can be used to implement various aspects of the present disclosure. Figure 1 100). For example, antenna 252, processors 266, 258, 264, and / or controller / processor 280 of UE 120 and / or antenna 234, processors 220, 230, 238, and / or controller / processor 240 of BS 110 may be used to perform the various techniques and methods described herein. Figure 2 As shown in , the controller / processor 240 of the BS 110 has a power control mode module 142. According to various aspects described herein, the power control mode module 142 can be configured to select a transmit power control mode and / or one or more transmit power parameters for use by the UE in sidelink communications, and to assign the selected transmit power control mode and transmit power parameters to the UE by sending signaling indicating the selected transmit power control mode to the UE. For example, Figure 2As shown in the figure, the controller / processor 280 of the UE 120 has a power control mode module 140. According to various aspects described herein, the power control mode module 140 can be configured to receive an indication of a transmit power control mode and / or one or more transmit power parameters for sidelink communication, and select the transmit power control mode and / or one or more transmit power parameters based on a received signal measurement report.

[0060] At BS 110, a transmit processor 220 may receive data from a data source 212 and control information from a controller / processor 240. The control information may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid automatic repeat request (HARQ) indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), etc. The data may be for a physical downlink shared channel (PDSCH), etc. The processor 220 may process (e.g., encode and symbol map) the data and control information, respectively, to obtain data symbols and control symbols. The transmit processor 220 may also generate reference symbols such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a cell-specific reference signal (CRS). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols (if applicable), and may provide an output symbol stream to modulators (MODs) 232a-232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a-232t may be transmitted via antennas 234a-234t, respectively.

[0061] At UE 120, antennas 252a-252r can receive downlink signals from BS 110 and can provide received signals to demodulators (DEMODs) 254a-254r in the transceiver, respectively. Each demodulator 254 can adjust (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 can obtain received symbols from all demodulators 254a-254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. Receive processor 258 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information to controller / processor 280.

[0062] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 (e.g., for a physical uplink shared channel (PUSCH)) and control information from a controller / processor 280 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 264 may also generate reference symbols for reference signals (e.g., for a sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by a demodulator 254a-254r (e.g., for SC-FDM, etc.) in the transceiver, and transmitted to the BS 110. At the BS 110, the uplink signal from the UE 120 may be received by the antenna 234, processed by the modulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and decoded control information to a controller / processor 240 .

[0063] Controllers / processors 240 and 280 may direct the operation at BS 110 and UE 120, respectively. Controller / processor 240 and / or other processors and modules at BS 110 may perform or direct the execution of processes for the techniques described herein. Memories 242 and 282 may store data and program codes for BS 110 and UE 120, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0064] Now refer to Figure 3, the block diagram shows a BS 302 and a plurality of user equipment 304 (eg, 304a and 304b). Here, the BS 302 may correspond to the BS 110 (eg, 110a-110c and 110x-110z), the UE 120c, or any other suitable node in the communication network 100. In an additional example, the BS 302 may correspond to Figure 2 Similarly, in various examples, UE 304 may correspond to UE 120 (eg, 120a-120d) or any other suitable node in communication network 100. In additional examples, UE 304 may correspond to Figure 2 UE120.

[0065] like Figure 3 As shown in , BS 302 can send data 306 (which data can be referred to as downlink data) to one or more UEs 304. According to certain aspects of the present disclosure, the term downlink can refer to a point-to-multipoint transmission originating from BS 302. Broadly speaking, BS 302 is a node or device responsible for scheduling traffic in a wireless communication network, which includes downlink transmissions and, in some examples, uplink data 310 transmissions from one or more UEs 304 to BS 302. Another way to describe the system can be to use the term broadcast channel multiplexing. According to various aspects of the present disclosure, the term uplink can refer to a point-to-point transmission originating from UE 304. Broadly speaking, UE 304 is a node or device that receives scheduling control information from another entity in the wireless communication network (such as BS 302), including but not limited to scheduling grants, synchronization or timing information, or other control information.

[0066] The BS 302 may send control information 308 including one or more control channels, such as a PBCH; a PSS; a SSS; a physical control format indicator channel (PCFICH); a physical hybrid automatic repeat request (HARQ) indicator channel (PHICH); and / or a physical downlink control channel (PDCCH), etc., to one or more UEs 304. The PHICH carries a HARQ feedback transmission, such as an acknowledgement (ACK) or a negative acknowledgement (NACK). HARQ is a technique well known to those of ordinary skill in the art, in which the accuracy of a packet transmission may be checked on the receiving side, and if acknowledged, an ACK may be sent, and if not acknowledged, a NACK may be sent. In response to a NACK, the transmitting device may send a HARQ retransmission, which may implement chase combining, incremental redundancy, etc.

[0067] Uplink data 310 and / or downlink data 306 (and in some examples, system information blocks (SIBs)), including one or more data channels, such as a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH), may additionally be transmitted between the BS 302 and the UE 304. The transmission of control information and data information may be organized by subdividing the carrier in time into appropriate transmission time intervals (TTIs).

[0068] In addition, UE 304 may send uplink control information 312 to BS 302 on a control channel including one or more uplink control channels. The uplink control information may include various packet types and categories, including pilots, reference signals, and information configured to enable or assist in decoding uplink data transmissions. In some examples, control information 312 may include a scheduling request (SR), i.e., a request to BS 302 to schedule an uplink transmission. Here, in response to the SR sent on the control channel, BS 302 may send downlink control information 308, which may schedule a TTI for uplink packet transmission.

[0069] In some examples, UEs such as the first UE 304a and the second UE 304b can utilize sidelink signals for direct D2D communication. The sidelink signals can include sidelink data 314 and sidelink control 316. The sidelink control information 316 can include a source transmit signal (STS), a direction select signal (DSS), a destination receive signal (DRS), and a physical sidelink HARQ indicator channel (PSHICH). The DSS / STS can provide a request duration for the UE 304 to keep the sidelink channel available for the sidelink signal; and the DRS can provide an indication to the UE 304 of the availability of the sidelink channel, such as within the requested duration. The exchange of DSS / STS and DRS signals (e.g., handshaking) can enable different UEs performing sidelink communication to negotiate the availability of the sidelink channel before the communication of the sidelink data 314 information (traffic). The PSHICH can include HARQ confirmation information and / or HARQ indicators from the destination device so that the destination can confirm the data received from the source device.

[0070] In some configurations, any one of the UEs, such as the first UE 302a or the second UE 302b, may be responsible for initiating and / or scheduling traffic in D2D communications, including communication of sidelink data 314 and sidelink control information 316, and maintenance of sidelink communication channels (multiple). For example, the first UE 302a may be responsible for scheduling and / or initiating signal measurement procedures (e.g., received signal strength indication (RSSI) measurements, reference signal received power (RSRP) measurements, reference signal received quality (RSRQ) measurements, etc.) and power control mode selection procedures between the first UE 302a and the second UE 302b as disclosed herein.

[0071] Figure 3 The channels or carriers shown in are not necessarily all channels or carriers that may be used between BS 302 and UE 304, and one of ordinary skill in the art will recognize that other channels or carriers may be used in addition to the channels or carriers shown, such as other data, control, and feedback channels.

[0072] Figure 4 is a diagram showing an example of a frame format 400 for NR. The transmission timeline for each data transmission and reception may be divided into units of radio frames 402. In NR, a basic transmission time interval (TTI) may be referred to as a slot. In NR, a subframe may contain a variable number of slots (e.g., 1, 2, 4, 8, 16, ..., N slots) depending on a subcarrier spacing (SCS). NR may support a basic SCS of 15KHz, and other SCSs (e.g., 30kHz, 60kHz, 120kHz, 240kHz, etc.) may be defined relative to the basic SCS. Figure 4 In the example shown, the SCS is 120kHz. Figure 4 As shown in FIG. 4 , subframe 404 (subframe 0) contains 8 slots (slots 0, 1, ..., 7) with a duration of 0.125 ms. Symbol and slot lengths scale with subcarrier spacing. Depending on the SCS, each slot may include a variable number of symbol (e.g., OFDM symbol) periods (e.g., 7 or 14 symbols). For Figure 4 For the 120 kHz SCS shown in FIG. 4 , each of time slots 406 (time slot 0) and time slots 408 (time slot 1) includes 14 symbol periods (slots with indices 0, 1, ..., 13) having a duration of 0.25 ms.

[0073] In the sidelink, a sidelink synchronization signal block (S-SSB) referred to as an SS block or SSB is transmitted. The SSB may include a primary SS (PSS), a secondary SS (SSS), and / or a dual-symbol physical sidelink broadcast channel (PSBCH). In some examples, the SSB may be transmitted up to 64 times, up to 64 different beam directions. Up to 64 transmissions of the SSB are referred to as an SS burst set. The SSBs in an SS burst set may be transmitted in the same frequency region, while the SSBs in different SS burst sets may be transmitted in different frequency regions.

[0074] exist Figure 4 In the example shown, in subframe 404, SSB is transmitted in each of the time slots (time slots 0, 1, ..., 7). Figure 4 In the example shown, in time slot 406 (time slot 0), SSB 410 is sent in symbols 4, 5, 6, and 7, and SSB 412 is sent in symbols 8, 9, 10, and 11; and in time slot 408 (time slot 1), SSB 414 is sent in symbols 2, 3, 4, and 5, SSB 416 is sent in symbols 6, 7, 8, and 9, and so on. The SSB may include a primary SS (PSS), a secondary SS (SSS), and a two-symbol physical sidelink broadcast channel (PSBCH). The PSS and SSS may be used by the UE to establish sidelink communications (e.g., transmission and / or reception of data and / or control channels). The PSS may provide half-frame timing, and the SS may provide cyclic prefix (CP) length and frame timing. The PSBCH carries some basic system information, such as system bandwidth, timing information within a radio frame, SS burst set periodicity, system frame number, etc. The SSB may be organized into SS bursts to support beam scanning. Further system information, such as Remaining Minimum System Information (RMSI), System Information Blocks (SIBs) and Other System Information (OSI) may be sent on the Physical Sidelink Shared Channel (PSSCH) in certain subframes.

[0075] Example Techniques for Sidelink Transmit Power Control Mode Selection

[0076] In the UE, the transmit power control mode is used to ensure that the UE transmits at an adequate power level. For example, if the UE transmits at an unnecessarily high power level, the amount of power required for communication will result in relatively rapid battery consumption and may cause interference to other nearby receivers. Conversely, if the UE is transmitting signals using too low a power level, communications with the UE may deteriorate due to high error rates and retransmissions, resulting in higher latency and relatively rapid battery consumption. In particular, in sidelink communications, UE mobility may require the UE to dynamically adjust the power control mode as the UE positioning and / or environment changes.

[0077] Accordingly, certain aspects of the present disclosure relate to techniques for controlling a sidelink transmit power level and changing a power level control mode of a UE based on one or more of: the positioning of the UE, the positioning of a BS serving the UE, and / or one or more signal measurements between the UE and another UE in sidelink communications.

[0078] Sidelink power control can be defined as a means of controlling the power of the sidelink physical channel and signal to ensure that the sidelink communication (e.g., sidelink data 314 and / or sidelink control 316) is effectively sent and received by one or more UEs at an appropriate power level. In the case of transmission, the appropriate power level is related to the power required for properly decoding the information sent through the physical channel. The appropriate transmit power for sidelink communication will depend on the channel characteristics, including channel attenuation and the noise and interference level on the receiver side. As described herein, transmit power control can be based on one or more of an open-loop power control mode or a closed-loop power control mode. In some cases, the appropriate transmit power for sidelink communication can be based on the presence or absence of cell coverage.

[0079] According to certain aspects, an open-loop power control mode on a UE may support path loss compensation, wherein the UE estimates the sidelink transmission path loss based on measurements of signals received on the sidelink and sets its own sidelink transmit power accordingly. In one example, the open-loop power control mode provides a means for the UE to adjust its transmit power so that the power of the signal received by the receiver is aligned with or approximately equal to a “target received power” (P 0 ). It should be noted that P 0 The sidelink transmission path loss may be part of the power control parameters of the UE configured by the BS or a parameter configured by the UE, which may depend on one or more of: the target data rate or the noise and interference levels experienced at the receiver. In an example scenario involving an indoor BS and indoor sidelink communications, the UE may estimate the sidelink transmission path loss based on measurements of received signals received by the UE through one or more of sidelink communications from another UE and / or access link communications from the BS. Based on this estimate, the UE may estimate the power loss that will result in a near P 0 The UE can then adjust the transmit power accordingly.

[0080] According to certain aspects, the closed-loop power control mode on the UE is based on explicit (e.g., transmit power control (TPC) commands) and / or implicit transmit power control commands received from the BS and / or another UE. These power control commands can be determined based on measurements of signals previously sent by the UE and measured at the receiving entity. For example, a first UE can send a signal to a second UE via a side link. The second UE receives the signal and performs power measurements to estimate path loss and / or channel quality. For example, the second UE can use the S-SSB (e.g., 410, 412, 414, 416) of the transmitted signal to perform side link power measurements. Typically, the second UE can communicate a TPC command to the first UE to adjust the transmit power at the first UE. However, if the first UE and the second UE are in the same cell, the second UE can use the BS to relay the TPC to the first UE. In addition, in some aspects, the BS can generate its own TPC to control the side link transmit power based on interference between the side link and the access link.

[0081] Example of selecting transmit power control mode based on base station deployment

[0082] Figure 5 is a diagram showing an exemplary scenario for adjusting a power control mode for controlling a sidelink transmit power level at a UE based on BS deployment. In this example, a first UE 504 is within cell coverage 508 and is connected to a BS 506 via an access link 510 and is connected to a second UE 502 via a side link 514.

[0083] In some aspects of the present disclosure, the deployment of the BS 506 may determine the sidelink transmit power control mode at the first UE 504. For example, the BS 506 may be deployed as an indoor BS 506, where the cell coverage 508 includes an indoor area and an outdoor area adjacent to the indoor area. In such a configuration, the first UE 504 and the second UE 502 may communicate via the sidelink 514 when located within the indoor area and / or within an adjacent outdoor area. In such a deployment, the BS may indicate to the first UE 504 an "indoor configuration" corresponding to the sidelink transmit power control mode and / or other transmit power parameters. In some examples, the indoor configuration may require an open-loop power control mode for the sidelink transmit power control and may include a maximum transmit power value, a reduced P value, and a reduced maximum transmit power value. 0 And other parameters.

[0084] In some aspects of the present disclosure, the BS 506 may be deployed as an outdoor BS 506, where the cell coverage 508 includes a generally outdoor area. In such a deployment, the BS may indicate an "outdoor configuration" to the first UE 504, which corresponds to, for example, a closed-loop power control mode for sidelink transmit power control and may include a maximum transmit power value and a P value corresponding to an increase relative to the indoor configuration. 0 Parameters.

[0085] It should be noted that the BS 506 may implicitly or explicitly indicate its deployment configuration to the first UE. In one example, the first UE 504 is pre-configured according to a wireless communication standard, or is previously configured by the BS 506 to include one or more transmit power control modes and / or parameters indexed according to a specific BS 506 deployment configuration. In such an example, the BS 506 may communicate an indication of its deployment configuration to the first UE 504, and the first UE 504 may implement a specific transmit power control mode and / or parameter associated with the deployment. In another example, the BS 506 may explicitly signal a specific transmit power control mode and / or parameter to the first UE 504.

[0086] In some aspects of the present disclosure, a BS 506 and a first UE 504 establish a connection 522 over an access link (AL) for communication. At this point, the BS 506 determines that the first UE 504 is connected thereto, and proceeds to send a signal 524 configured to indicate a BS 506 deployment configuration to the first UE 504. In some configurations, the BS 506 communicates the deployment configuration to the first UE 504 via one or more of a system information block (SIB) or a radio resource control (RRC) message. Upon receiving the signal 524, the first UE 504 adjusts a sidelink transmit power control mode corresponding to the BS 506 deployment configuration at a first block 526. The first UE 504 may then adjust the sidelink transmit power according to the transmit power control mode at a second block 528, and communicate 530 with the second UE 502 via the sidelink using the adjusted sidelink transmit power.

[0087] Example of selecting transmit power control mode based on UE positioning

[0088] Figure 6 6 is a diagram showing an exemplary scenario for adjusting a power control mode for controlling a sidelink transmit power level at a UE based on the positioning of the UE. In this example, a first UE 604 is within a cell coverage 608 and is connected to a BS 606 via an access link 610 and is connected to a second UE 602 via a side link 614.

[0089] In some aspects of the present disclosure, the positioning of the first UE 604 may determine which sidelink transmit power control mode should be used at the first UE 604. For example, the first UE 604 may be indoors or outdoors. In some examples, depending on the positioning of the first UE 604, certain sidelink transmit power control modes may be more suitable for the first UE 604. For example, if the first UE 604 is indoors, it may be assumed that the first UE 604 is moving slower, if it is moving at all. It may also be assumed that higher transmit powers may cause a higher degree of interference in an indoor environment relative to an outdoor environment.

[0090] In some aspects of the present disclosure, the BS 606 may use one or more of UE-based, UE-assisted, and / or network-based positioning modes to determine the location of the first UE 604. Positioning refers to a function for detecting or determining the geographic location of a target UE (e.g., the first UE 604). In some examples, the network may have one or more location measurement units (LMUs) that support the BS 606 and assist in certain methods for determining the location of the first UE 604. The BS 606 may also determine whether the first UE 604 is indoors or outdoors based on the determined location and / or based on the behavior of the first UE 604 (e.g., whether the UE is moving or stationary, whether the UE movement speed is commensurate with driving or walking, etc.).

[0091] Once the BS 606 determines whether the first UE 604 is indoors or outdoors, the BS 606 may select a sidelink transmit power control mode based on the determination of whether the UE 604 is indoors or outdoors, and send a signal to the first UE 604 to configure the first UE 604 to the selected sidelink transmit power control mode. In some configurations, the BS 606 selects between an open-loop power control mode for indoor UE positioning and a closed-loop power control mode for outdoor UE positioning.

[0092] It should be noted that the configuration signal from the BS 606 may be provided to the first UE 604 implicitly or explicitly. In one example, the first UE 604 is preconfigured according to a wireless communication standard, or is previously configured by the BS 606 to include one or more sidelink transmit power control modes and / or parameters indexed according to a specific bit value in a field of a signal sent by the BS 606. In such an example, the BS 606 may communicate an indication of the selected sidelink transmit power control mode to the first UE 604, and the first UE 604 may implement the specific transmit power control mode and / or parameter associated with the signaling. In another example, the BS 606 may explicitly signal the first UE 604 with a specific sidelink transmit power control mode and / or parameter.

[0093] For example, the BS 606 and the first UE 604 establish a connection 622 over an access link (AL) for communication. At a first block 624, the BS 606 determines the location of the first UE 604. At a second block 626, the BS 606 proceeds to select a sidelink transmit power mode 626 for the first UE 604 based on the determined location. The BS 606 communicates an indication 628 of the selected sidelink transmit power mode to the first UE 604 via one or more of a system information block (SIB) or a radio resource control (RRC) message. Upon receiving the indication, the first UE 604 changes to a sidelink transmit power control mode corresponding to the control mode indicated by the BS 606. The first UE 604 may then adjust the sidelink transmit power according to the sidelink transmit power control mode and communicate 630 with the second UE 602 via the sidelink using the adjusted sidelink transmit power.

[0094] Example of transmit power control mode selection based on UE report

[0095] Figure 7 is a diagram illustrating an exemplary scenario for adjusting a power control mode for controlling a sidelink transmit power level at a UE based on reports from one or more other UEs in the sidelink. In this example, a first UE 704 has established a sidelink 714 connection with a second UE 702.

[0096] In some aspects of the present disclosure, the report of the measured sidelink signal can determine which sidelink transmit power control mode should be used at the first UE 704. For example, the first UE 704 and the second UE 702 can each be configured to perform physical layer measurements including received power measurements. For example, the first UE 704 and the second UE 702 can be configured to perform reference signal received power (RSRP), reference signal received quality (RSRQ), signal to interference plus noise ratio (SINR), reference signal received power of each branch (RSRPB), etc. on the signal received through the side link 714. Based on these measurements, the first UE 704 and the second UE 702 can send a report to the other UE.

[0097] For example, the first UE 704 and the second UE 702 may establish a sidelink communication 722. The second UE 702 may perform measurements on the signal received from the first UE 704 to determine the received signal power, and then communicate a signal report to the first UE 704, the signal report indicating one or more power measurement values ​​from the performed signal measurement. At the first block 724, the first UE 704 may determine whether the one or more power measurement values ​​meet a threshold condition. For example, if the power measurement value is greater than the threshold, the threshold condition is met. However, if the power measurement value is less than the threshold, the threshold condition is not met. Once the first UE 704 determines whether the threshold condition is met, at the second block 726, the first UE 704 may select a sidelink transmit power control mode for controlling the transmit power on the sidelink. In some configurations, selecting the sidelink transmit power control mode includes selecting an open-loop power control mode or a closed-loop power control mode. Once the first UE 704 selects the sidelink transmit power control mode, the first UE 704 implements the mode and continues to communicate 730 via the sidelink using the selected sidelink transmit power control mode.

[0098] In some examples, if the threshold condition is met, the first UE 704 selects an open-loop power control mode, and if the threshold condition is not met, the first UE 704 selects a closed-loop control mode.

[0099] In some examples, if the second UE 702 reports a power measurement value less than a threshold, the first UE 704 can continue to select a transmit power level instead of a transmit power control mode. For example, the first UE 704 can select a maximum transmit power level for transmitting data with the second UE 702 via the side link 714. In some aspects, the first UE 704 performs a signal power measurement on a signal received from the second UE 702 and compares the measurement value with a threshold to determine whether the threshold condition is met. If the threshold condition is not met (e.g., one or more measurement values ​​are less than the threshold), the UE can respond by selecting a maximum transmit power level for transmitting data with the second UE 702 via the side link 714.

[0100] It should be noted that in some aspects, one or more of the first UE 704 or the second UE 702 can initiate and perform this type of transmit power control with another UE in a sidelink communication. For example, the performance of this type of transmit power control can be based on determining that one or more of the first UE 704 or the second UE 702 is not within the coverage of a cell or within the range of a BS.

[0101] Figure 88 is a flow diagram illustrating example operations 800 for wireless communications in accordance with certain aspects of the present disclosure. Operations 800 may be performed, for example, by a BS (e.g., such as BS 110 in wireless communication network 100). Operations 800 may be implemented as a processor (e.g., Figure 2 In addition, in operation 800, the BS may transmit and receive signals, for example, through one or more antennas (e.g., Figure 2 In some aspects, the transmission and / or reception of signals by the BS may be implemented via a bus interface of one or more processors (eg, controller / processor 240) that acquire and / or output signals.

[0102] Operations 800 may begin at step 805 by determining that a UE (eg, UE 120a) is already connected to a BS.

[0103] Operation 800 proceeds to step 810 by configuring the UE to use a first transmit power control mode for determining transmit power for transmitting wireless data through a side link based on the BS being located indoors.

[0104] In certain aspects, the first transmit power control mode comprises an open loop power control mode.

[0105] In certain aspects, configuring the UE includes communicating an indication of the first transmit power control mode to the UE via one or more of a system information block (SIB) or a radio resource control (RRC) message.

[0106] Fig. 9 900 for wireless communications in accordance with certain aspects of the present disclosure. Operations 900 may be performed, for example, by a BS (e.g., such as BS 110 in wireless communication network 100). Operations 900 may be implemented as a processor (e.g., Figure 2 In addition, in operation 900, the BS may transmit and receive signals, for example, through one or more antennas (e.g., Figure 2 In some aspects, the transmission and / or reception of signals by the BS may be implemented via a bus interface of one or more processors (eg, controller / processor 240) that acquire and / or output signals.

[0107] Operations 900 may begin at step 905 by determining a location of a user equipment (UE).

[0108] Operation 900 proceeds to step 910 by selecting one of a first transmission power control mode or a second transmission power control mode for determining transmission power for transmitting wireless data through a side link based on the determined positioning of the UE.

[0109] Operations 900 proceed to step 915 by configuring the UE to use a selected one of the first transmit power control mode or the second transmit power control mode.

[0110] In certain aspects, determining the location includes determining whether the UE is in an indoor location or an outdoor location.

[0111] In certain aspects, operations 900 also include receiving one or more of UE-based positioning information or UE-assisted positioning information from the UE, wherein determining the positioning of the UE is based on the one or more of the UE-based positioning information or the UE-assisted positioning information.

[0112] In certain aspects, the operations 900 further include transmitting a reference signal, wherein the UE-assisted positioning information includes results of measurements made by the UE based on the reference signal and at least one other reference signal transmitted by another BS.

[0113] In certain aspects, the UE-based positioning information includes the results of calculations made by the UE based on data received from a location server.

[0114] In certain aspects, the first transmit power control mode comprises an open loop power control mode, and wherein the second transmit power control mode comprises a closed loop power control mode.

[0115] In certain aspects, the first power control mode is configured to provide a lower maximum transmit power for transmitting wireless data via the sidelink relative to the second power control mode.

[0116] Fig.10 1 is a flow diagram illustrating example operations 1000 for wireless communications in accordance with certain aspects of the present disclosure. Operations 1000 may be performed, for example, by a UE (e.g., such as UE 120 in wireless communication network 100). Operations 1000 may be implemented as a process on one or more processors (e.g., Figure 2 In addition, in operation 1000, the UE may transmit and receive signals, for example, through one or more antennas (e.g., Figure 2 In some aspects, the transmission and / or reception of signals by the UE may be implemented via a bus interface of one or more processors (eg, controller / processor 280) that acquire and / or output signals.

[0117] Operations 1000 may begin at step 1005 by transmitting a signal to a second UE via a sidelink.

[0118] Operations 1000 may proceed to step 1010 by receiving a report from the second UE indicating measurements of signals received by the second UE.

[0119] Operation 1000 may proceed to step 1015 by determining whether the measurement satisfies a threshold.

[0120] Operation 1000 may proceed to step 1020 by selecting, based on a determination of whether the measurement satisfies a threshold, one of: (i) a power control mode for determining a transmit power for transmitting wireless data via the side link, or (ii) a transmit power level for transmitting wireless data via the side link.

[0121] In certain aspects, if the measurement does not satisfy the threshold, operations 1000 include selecting a transmit power level for transmitting the wireless data, wherein the transmit power level is a maximum level transmit power for the first UE.

[0122] In certain aspects, if the measurement satisfies the threshold, operations 1000 include selecting a power control mode for determining transmit power, wherein the power control mode is a closed loop power control mode or an open loop power control mode.

[0123] In certain aspects, operations 1000 include selecting a closed loop power control mode or an open loop power control mode, wherein the selection is based on a reference signal received power (RSRP) measurement.

[0124] Fig.11 A communication device 1100 is shown, which may include devices configured to perform operations of the techniques disclosed herein (such as Figure 8 and Fig. 9 The communication device 1100 includes a processing system 1102 coupled to a transceiver 1108. The transceiver 1108 is configured to transmit and receive signals for the communication device 1100, such as the various signals described herein, via an antenna 1110. The processing system 1102 may be configured to perform processing functions for the communication device 1100, including processing signals received and / or transmitted by the communication device 1100.

[0125] The processing system 1102 includes a processor 1104 coupled to a computer-readable medium / memory 1112 via a bus 1106. In certain aspects, the computer-readable medium / memory 1112 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1104, cause the processor 1104 to perform Figure 8 and Fig. 9 , or other operations for performing the various techniques discussed herein for allocating or switching sidelink transmit power control modes. In some aspects, the computer-readable medium / memory 1112 stores code 1130 for determining that the UE is connected to the BS. In some aspects, the computer-readable medium / memory 1112 stores code 1132 for configuring the UE to use a first transmit power control mode. In some aspects, the computer-readable medium / memory 1112 stores code 1134 for determining the positioning of the UE. In some aspects, the computer-readable medium / memory 1112 stores code 1136 for selecting a transmit power control mode. In some aspects, the computer-readable medium / memory 1112 stores code 1138 for configuring the UE to use the selected transmit power control mode. In some aspects, the processor 1104 has circuits configured to implement the code stored in the computer-readable medium / memory 1112. Processor 1104 includes a circuit 1120 for determining that the UE is connected to the BS, a circuit 1122 for configuring the UE to use a first transmit power control mode, a circuit 1124 for determining the positioning of the UE, a circuit 1126 for selecting a transmit power control mode, and a circuit 1128 for configuring the UE to use the selected transmit power control mode.

[0126] Fig.12 A communication device 1200 is shown, which may include devices configured to perform operations of the techniques disclosed herein (such as Fig.10 1200). The communication device 1200 includes a processing system 1202 coupled to a transceiver 1208. The transceiver 1208 is configured to transmit and receive signals for the communication device 1200, such as the various signals described herein, via an antenna 1210. The processing system 1202 may be configured to perform processing functions for the communication device 1200, including processing signals received and / or transmitted by the communication device 1200.

[0127] The processing system 1202 includes a processor 1204 coupled to a computer readable medium / memory 1212 via a bus 1206. In certain aspects, the computer readable medium / memory 1212 is configured to store programs that, when executed by the processor 1204, cause the processor 1204 to execute Fig.10Instructions (e.g., computer executable code) for the operations shown, or other operations for performing various techniques for allocating or switching sidelink transmit power control modes discussed herein. In some aspects, the computer-readable medium / memory 1212 stores code 1214 for selecting a power control mode. In some aspects, the computer-readable medium / memory 1212 stores code 1216 for receiving a report. In some aspects, the computer-readable medium / memory 1212 stores code 1218 for determining whether a measurement meets a threshold. In some aspects, the computer-readable medium / memory 1212 stores code 1220 for selecting a power control mode. In some aspects, the processor 1204 has a circuit configured to implement the code stored in the computer-readable medium / memory 1212. The processor 1204 includes a circuit 1222 for sending a signal to a second UE, a circuit 1224 for receiving a report, a circuit 1226 for determining whether a measurement meets a threshold, and a circuit 1228 for selecting a power control mode.

[0128] Additional Considerations

[0129] The methods disclosed herein include one or more steps or actions for implementing these methods. The method steps and / or actions can be interchangeable with each other without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions can be modified without departing from the scope of the claims.

[0130] As used herein, a phrase referring to "at least one" of a list of items refers to any combination of those items, including single members. As an example, "at least one of a, b, or c" is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination with multiple of the same elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc or any other order of a, b, and c).

[0131] As used herein, the term "determining" includes a variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), ascertaining, etc. In addition, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), etc. In addition, "determining" may include resolving, selecting, choosing, establishing, etc.

[0132] The previous description is provided to enable those skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but are given the full scope consistent with the text of the claims, wherein, unless specifically stated otherwise, reference to an element in the singular is not intended to mean "one and only one", but "one or more". Unless otherwise specifically stated, the term "some" refers to one or more. All structural and functional equivalents of the elements of the various aspects of the present disclosure known or to be known later by those of ordinary skill in the art are expressly incorporated herein by reference, and are intended to be included by the claims. In addition, nothing disclosed herein is intended to be contributed to the public, regardless of whether such disclosure is explicitly recorded in the claims. No claim element should be interpreted under the provisions of Section 112(f) of Title 35 of the United States Code unless the element is explicitly recorded using "a component for..." or, in the case of a method claim, the element is recorded using the phrase "a step for...".

[0133] The various operations of the method described above can be performed by any suitable component that can perform the corresponding function. These components may include (multiple) various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs) or processors. Typically, where there are operations shown in the figure, those operations may have corresponding paired components plus functional components with similar numbers.

[0134] The various illustrative logic blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or executed using 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 (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0135] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. Depending on the specific application and overall design constraints of the processing system, the bus may include any number of interconnecting buses and bridges. The bus may link together various circuits including a processor, a machine-readable medium, and a bus interface. The bus interface may also be used to connect a network adapter, etc., to the processing system via the bus. The network adapter may be used to implement signal processing functions at the physical (PHY) layer. In the user terminal 120 (see Figure 1 ), a user interface (e.g., a keypad, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are well known in the art and therefore will not be described further. The processor may be implemented using one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits that can execute software. Those skilled in the art will recognize how to best implement the functionality described for the processing system depending on the specific application and the overall design constraints imposed on the entire system.

[0136] If implemented with software, the functions may be stored on or transmitted through a computer-readable medium as one or more instructions or codes. Whether referred to as software, firmware, middleware, microcode, hardware description language or other terms, software should be broadly interpreted as meaning instructions, data or any combination thereof. Computer-readable media include both computer storage media and communication media, and communication media include any media that helps to transfer a computer program from one place to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on a machine-readable storage medium. A computer-readable storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. In an alternative, the storage medium may be integrated into the processor. For example, a machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium having instructions stored thereon that is separated from a wireless node, all of which may be accessed by a processor through a bus interface. Alternatively or in addition, a machine-readable medium or any part thereof may be integrated into a processor, such as a cache and / or a general register file in this case. For example, examples of machine-readable storage media may include RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. Machine-readable media may be embodied in a computer program product.

[0137] A software module may include a single instruction or many instructions, and may be distributed over several different code segments, distributed among different programs, and distributed across multiple storage media. A computer-readable medium may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a sending module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices. For example, when a triggering event occurs, a software module may be loaded from a hard drive into a RAM. During the execution of a software module, a processor may load some of the instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general register file for execution by a processor. It will be understood that when the functions of a software module are mentioned below, such functions are implemented by a processor when executing instructions from the software module.

[0138] In addition, any connection is appropriately referred to as a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared (IR), radio and microwave) is used to send software from a website, server or other remote source, then the coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology (such as infrared, radio and microwave) is included in the definition of the medium. As used herein, disks and optical discs include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy disks and blue-ray discs, wherein disks usually copy data magnetically, while optical discs use lasers to optically copy data. Therefore, in some aspects, computer-readable media may include non-temporary computer-readable media (e.g., tangible media). In addition, for other aspects, computer-readable media may include temporary computer-readable media (e.g., signals). The combination of the above should also be included in the scope of computer-readable media.

[0139] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium having instructions stored (and / or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein. For example, a computer program product for performing the operations described herein and Figure 8-10 The operations shown in the instructions.

[0140] In addition, it should be understood that the modules and / or other appropriate components for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station as appropriate. For example, such a device can be coupled to a server to facilitate the transmission of the components for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage component (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or a floppy disk, etc.) so that the user terminal and / or base station can obtain the various methods when the storage component is coupled to or provided to the device. In addition, any other appropriate technology for providing the methods and techniques described herein to a device can be utilized.

[0141] It is to be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication by a base station (BS), the method comprises: determining that a UE has connected to the BS; and configuring the UE to use one of a first transmit power control mode or a second transmit power control mode for determining a transmit power for transmitting wireless data over a sidelink, wherein configuring the UE to use the first transmit power control mode is based on the BS being located indoors, and wherein configuring the UE to use the second transmit power control mode is based on the BS being located outdoors.

2. The method according to claim 1, wherein the first transmit power control mode comprises an open-loop power control mode, and wherein the second transmit power control mode comprises a closed-loop power control mode.

3. The method according to claim 1, wherein configuring the UE comprises communicating an indication of the first transmit power control mode to the UE via one or more of a system information block (SIB) or a radio resource control (RRC) message.

4. A base station (BS) for wireless communication, comprises: a processor; and a memory communicatively coupled to the processor, wherein the processor is configured to: determine that a UE has connected to the BS; and configure the UE to use one of a first transmit power control mode or a second transmit power control mode for determining a transmit power for transmitting wireless data over a sidelink, wherein configuring the UE to use the first transmit power control mode is based on the BS being located indoors, and wherein configuring the UE to use the second transmit power control mode is based on the BS being located outdoors.

5. The BS according to claim 4, wherein the first transmit power control mode comprises an open-loop power control mode, and wherein the second transmit power control mode comprises a closed-loop power control mode.

6. The BS according to claim 4, further comprises: communicating an indication of the first transmit power control mode to the UE via one or more of a system information block (SIB) or a radio resource control (RRC) message.

7. A base station (BS) for wireless communication, comprises: means for determining that a UE has connected to the BS; and means for configuring the UE to use one of a first transmit power control mode or a second transmit power control mode for determining a transmit power for transmitting wireless data over a sidelink, wherein configuring the UE to use the first transmit power control mode is based on the BS being located indoors, and wherein configuring the UE to use the second transmit power control mode is based on the BS being located outdoors.

8. A computer-readable medium having stored thereon one or more instructions that are executable by one or more processors to implement the method according to any one of claims 1 to 3.

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