WO2022006872A1 - Réservation de ressources avec transmissions à trp multiples - Google Patents

Réservation de ressources avec transmissions à trp multiples Download PDF

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Publication number
WO2022006872A1
WO2022006872A1 PCT/CN2020/101402 CN2020101402W WO2022006872A1 WO 2022006872 A1 WO2022006872 A1 WO 2022006872A1 CN 2020101402 W CN2020101402 W CN 2020101402W WO 2022006872 A1 WO2022006872 A1 WO 2022006872A1
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WO
WIPO (PCT)
Prior art keywords
reservation
transmitter
delta value
receiver
rsrp
Prior art date
Application number
PCT/CN2020/101402
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English (en)
Inventor
Sourjya Dutta
Kapil Gulati
Junyi Li
Shuanshuan Wu
Hui Guo
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Qualcomm Incorporated
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Publication date
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Priority to PCT/CN2020/101402 priority Critical patent/WO2022006872A1/fr
Publication of WO2022006872A1 publication Critical patent/WO2022006872A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/383—TPC being performed in particular situations power control in peer-to-peer links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the following relates generally to wireless communications and more specifically to resource reservation with multi-transmission-reception point (TRP) transmissions.
  • TRP multi-transmission-reception point
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) .
  • Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems.
  • 4G systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems
  • 5G systems which may be referred to as New Radio (NR) systems.
  • a wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • Vehicles may have multiple transmission-reception points (TRPs) which may be positioned at some distance from one another. That is, the TRPs may not be co-located on the UE.
  • TRPs transmission-reception points
  • the TRPs at the front of the vehicle may be separated from TRPs at the rear of the vehicle by a dozen meters or more.
  • the distance between TRPs may result in issues related to resource reservations that are based on reference signal received powers (RSRPs) at a receiving UE.
  • RSRPs reference signal received powers
  • the described techniques relate to improved methods, systems, devices, and apparatuses that support resource reservation with multi-transmission-reception points (TRP) transmissions.
  • TRP multi-transmission-reception points
  • the described techniques provide for a transmitting user equipment (UE) conveying a reservation RSRP delta value to receiving UEs, and the receiving UEs may use the reservation RSRP delta value in conjunction with the RSRP of the initial transmission to evaluate reserved resources. For example, when a receiving UE evaluates a reserved resource, the reservation RSRP delta value may be added the measured RSRP to evaluate the resource (e.g., relative to a corresponding threshold) .
  • the reservation RSRP delta value may account for an increased RSRP of a subsequent transmission (e.g., a retransmission) by the transmitting UE due to the varying transmission powers of multiple TRPs at the transmitting UE.
  • This technique may avoid or reduce interference during the reserved resources due to the transmission power variance.
  • a method of wireless communication at a first UE is described.
  • the method may include determining, at the first UE and based on the first UE having multiple transmitter-receiver points, a reservation reference signal received power (RSRP) delta value to be added to a measured signal power by other UEs in evaluating a resource reservation of the first UE, transmitting a control message that includes an indication of the RSRP delta value to be applied by the other UEs in evaluating the resource reservation of the first UE, and transmitting an initial sidelink data message using the multiple transmitter-receiver points in accordance with the control message.
  • RSRP reservation reference signal received power
  • the apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to determine, at the first UE and based on the first UE having multiple transmitter-receiver points, a reservation reference signal received power (RSRP) delta value to be added to a measured signal power by other UEs in evaluating a resource reservation of the first UE, transmit a control message that includes an indication of the RSRP delta value to be applied by the other UEs in evaluating the resource reservation of the first UE, and transmit an initial sidelink data message using the multiple transmitter-receiver points in accordance with the control message.
  • RSRP reservation reference signal received power
  • the apparatus may include means for determining, at the first UE and based on the first UE having multiple transmitter-receiver points, a reservation reference signal received power (RSRP) delta value to be added to a measured signal power by other UEs in evaluating a resource reservation of the first UE, transmitting a control message that includes an indication of the RSRP delta value to be applied by the other UEs in evaluating the resource reservation of the first UE, and transmitting an initial sidelink data message using the multiple transmitter-receiver points in accordance with the control message.
  • RSRP reservation reference signal received power
  • a non-transitory computer-readable medium storing code for wireless communication at a first UE is described.
  • the code may include instructions executable by a processor to determine, at the first UE and based on the first UE having multiple transmitter-receiver points, a reservation reference signal received power (RSRP) delta value to be added to a measured signal power by other UEs in evaluating a resource reservation of the first UE, transmit a control message that includes an indication of the RSRP delta value to be applied by the other UEs in evaluating the resource reservation of the first UE, and transmit an initial sidelink data message using the multiple transmitter-receiver points in accordance with the control message.
  • RSRP reservation reference signal received power
  • transmitting the control message may include operations, features, means, or instructions for including, within the control message, an indication that the first UE may be configured with the multiple transmitter-receiver points.
  • transmitting the control message may include operations, features, means, or instructions for transmitting a sidelink control information message that includes the indication of the reservation RSRP delta value and the resource reservation.
  • transmitting the control message may include operations, features, means, or instructions for transmitting the control message for each transmitter-receiver point of the multiple transmitter-receiver points, at least one control message including the indication of a respective reservation RSRP delta value for a corresponding transmitter-receiver point.
  • transmitting the control message may include operations, features, means, or instructions for transmitting the control message for each transmitter-receiver point of the multiple transmitter-receiver points, each control message including the indication of a respective reservation RSRP delta value for a corresponding transmitter-receiver point.
  • each reservation RSRP delta value for each transmitter-receiver point of the multiple transmitter-receiver points may be a same value.
  • each reservation RSRP delta value for each transmitter-receiver point of the multiple transmitter-receiver points may be a different value.
  • each control message includes a first of two sidelink control information messages.
  • transmitting the control message may include operations, features, means, or instructions for transmitting at least one sidelink control information message that includes the indication of the reservation RSRP delta value for each transmitter-receiver point of the multiple transmitter-receiver points.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for including, within the at least one sidelink control information message, the indication of the reservation RSRP delta value for each transmitter-receiver point using a set of transmission configuration state index values.
  • the at least one sidelink control information message includes a second of two sidelink control information messages.
  • transmitting the control message may include operations, features, means, or instructions for transmitting a radio resource control message that includes the indication of the reservation RSRP delta value.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting one or more subsequent sidelink data messages at one or more of the multiple transmitter-receiver points, each subsequent sidelink data message transmitted with a transmission power incremented by the reservation RSRP delta value in successive transmissions.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting the one or more subsequent data message based on a power budget or a transmission quantity budget.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving feedback corresponding to the initial transmission at one or more of the multiple transmitter-receiver points, and transmitting a retransmission of the sidelink data message at the one or more of the multiple transmitter-receiver points and using a retransmission power determined in accordance with the control message based on receiving the feedback.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting a subsequent control message that may have a same transmission power of the control message that includes the indication of the reservation RSRP delta value, while varying transmission power of subsequent data messages based on the reservation RSRP delta value.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining the retransmission power that may be greater than a transmission power of the initial sidelink transmission by incrementing the transmission power of the initial sidelink transmission by an amount that may be less than or equal to the reservation RSRP delta value.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that a transmission from a first transmitter-receiver point of the multiple transmitter-receiver points may have a higher probability of interference than a transmission from a second transmitter-receiver point of the multiple transmitter-receiver points, and determining the reservation RSRP delta value for the first transmitter-receiver point based on determining that the transmission from the first transmitter-receiver point may have the higher probability of interference.
  • a method of wireless communications at a second UE may include receiving a message that includes an indication of a reservation reference signal received power (RSRP) delta value to be added to a measured reference signal received power used in evaluating a resource reservation of a first UE, measuring the reference signal received power of an initial sidelink transmission that is received from the first UE, evaluating the resource reservation of the first UE based on the reference signal received power and the reservation RSRP delta value, determining one or more sidelink transmission resources to be used by the second UE based on the evaluation of the resource reservation of the first UE, and communicating using the one or more sidelink transmission resources.
  • RSRP reservation reference signal received power
  • the apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to receive a message that includes an indication of a reservation reference signal received power (RSRP) delta value to be added to a measured reference signal received power used in evaluating a resource reservation of a first UE, measure the reference signal received power of an initial sidelink transmission that is received from the first UE, evaluate the resource reservation of the first UE based on the reference signal received power and the reservation RSRP delta value, determine one or more sidelink transmission resources to be used by the second UE based on the evaluation of the resource reservation of the first UE, and communicate using the one or more sidelink transmission resources.
  • RSRP reservation reference signal received power
  • the apparatus may include means for receiving a message that includes an indication of a reservation reference signal received power (RSRP) delta value to be added to a measured reference signal received power used in evaluating a resource reservation of a first UE, measuring the reference signal received power of an initial sidelink transmission that is received from the first UE, evaluating the resource reservation of the first UE based on the reference signal received power and the reservation RSRP delta value, determining one or more sidelink transmission resources to be used by the second UE based on the evaluation of the resource reservation of the first UE, and communicating using the one or more sidelink transmission resources.
  • RSRP reservation reference signal received power
  • a non-transitory computer-readable medium storing code for wireless communications at a second UE is described.
  • the code may include instructions executable by a processor to receive a message that includes an indication of a reservation reference signal received power (RSRP) delta value to be added to a measured reference signal received power used in evaluating a resource reservation of a first UE, measure the reference signal received power of an initial sidelink transmission that is received from the first UE, evaluate the resource reservation of the first UE based on the reference signal received power and the reservation RSRP delta value, determine one or more sidelink transmission resources to be used by the second UE based on the evaluation of the resource reservation of the first UE, and communicate using the one or more sidelink transmission resources.
  • RSRP reservation reference signal received power
  • receiving the message may include operations, features, means, or instructions for receiving, within the control message an indication that the first UE may be configured with multiple transmitter-receiver points.
  • receiving the message may include operations, features, means, or instructions for receiving a sidelink control information message that includes the indication of the reservation RSRP delta value and the resource reservation.
  • receiving the message may include operations, features, means, or instructions for receiving multiple control messages, each control message corresponding to a transmitter-receiver point of multiple transmitter-receiver points of the first UE and at least one control message including an indication of a respective reservation RSRP delta value.
  • receiving the message may include operations, features, means, or instructions for receiving multiple control messages, each control message corresponding to a transmitter-receiver point of multiple transmitter-receiver points of the first UE and including an indication of a respective reservation RSRP delta value.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for evaluating the resource reservation based on a maximum reference signal received power of the initial sidelink transmission that may be transmitted via each of the multiple transmitter-receiver points.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for evaluating the resource reservation based on a maximum reference signal received power of the initial sidelink transmission that may be transmitted via each of the multiple transmitter-receiver points that may have reference signal received powers that satisfy a threshold reference signal received power, where the reference signal received power used for evaluating the resource reservation may be based on a sum of the reference signal received powers that satisfy the threshold reference signal received power.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for evaluating the resource reservation based on a reference signal received power of the initial sidelink transmission that may be transmitted via each of the multiple transmitter-receiver points and a reservation RSRP delta value indicated by each of the multiple control messages.
  • each of the multiple control message includes a first of two control information messages.
  • receiving the message may include operations, features, means, or instructions for receiving at least one control message that that includes the indication of the reservation RSRP delta value for each transmitter-receiver point of multiple transmitter-receiver points of the first UE.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying the indication of the reservation RSRP delta value for each transmitter-receiver point based on a transmission configuration state index of the at least one control message.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a difference between a measured reference signal received power corresponding to each transmitter-receiver point of the multiple transmitter-receiver points may be less than or equal to the resource reservation threshold, and evaluating the resource reservation based on a maximum reference signal received power corresponding to each transmitter-receiver point or based on a sum of the reference signal received power of the multiple transmitter-receiver points and a respective reservation RSRP delta value.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a difference between a reference signal received power corresponding to each transmitter-receiver point of the multiple transmitter-receiver points may be greater than or equal to the resource reservation threshold, and evaluating the resource reservation based on the reservation RSRP delta value corresponding to a maximum reference signal received power corresponding to each transmitter-receiver point.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for evaluating the resource reservation based on one or more prior reference signal received power measurements corresponding to the multiple transmission-receiver points.
  • the at least one control message includes a second of two sidelink control information messages.
  • receiving the message may include operations, features, means, or instructions for receiving, from the first UE, a radio resource control message that indicates the reservation RSRP delta value.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for evaluating the one or more sidelink transmission resources based on incrementing the reservation RSRP delta value for each subsequent sidelink transmission resource of the one or more sidelink transmission resources.
  • receiving the message may include operations, features, means, or instructions for receiving, from a base station, a configuration for the reservation RSRP delta value.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for evaluating the resource reservation based on a maximum reference signal received power of the initial sidelink transmission that may be transmitted via each of transmitter-receiver points of multiple transmitter-receiver points of the first UE and the reservation RSRP delta value received from the base station.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for evaluating the resource reservation based on a sum of reference signal received powers of the initial sidelink transmission that may be transmitted via each transmitter-receiver point of multiple transmitter-receiver points of the first UE and the reservation RSRP delta value received from the base station.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the first UE, a sidelink control information message that indicates a different reservation RSRP delta value, where evaluating the resource reservation may be based on the different reservation RSRP delta value.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for evaluating the resource reservation of the first UE using the reservation RSRP delta value based on a distance between the first UE and the second UE, the distance being indicated by the message.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the first UE, feedback associated with a data transmission corresponding to the initial sidelink transmission, and monitoring for a retransmission by the first UE of the data transmission based on the resource reservation and the reservation RSRP delta value.
  • FIG. 1 illustrates an example of a system for wireless communications that supports resource reservation with multi-transmission-reception point (TRP) transmissions in accordance with aspects of the present disclosure.
  • TRP multi-transmission-reception point
  • FIG. 2 illustrates an example of a wireless communications system that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • FIG. 3 illustrates an example of a wireless communications system that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • FIG. 4 illustrates an example of a process flow diagram that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • FIG. 5 illustrates an example of a process flow diagram that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • FIGs. 6 and 7 show block diagrams of devices that support resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • FIG. 8 shows a block diagram of a communications manager that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • FIG. 9 shows a diagram of a system including a device that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • FIGs. 10 and 11 show flowcharts illustrating methods that support resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • the UEs may transmit sidelink data messages and corresponding sidelink control messages.
  • the sidelink control messages may reserve resources for possible retransmission of portions of the data messages or for other subsequent data messages.
  • the receiving UEs may use a reference signal received power (RSRP) of the initial transmission of the data message to evaluate the resource reservation. That is, the receiving UE may evaluate which resources are available for its own transmission based on an RSRP measurement of the initial received data transmission. For example, the receiving UE may evaluate the RSRP of the initial data transmission to determine whether a retransmission on those reserved resource, with the same RSRP, may interfere with a transmission by the receiving UE on the same resources. In some cases, the receiving UE may consider a RSRP threshold that is contingent on the time domain location of the resource within a packet delay budget.
  • RSRP reference signal received power
  • Vehicles may have multiple transmission-reception points (TRPs) which may be positioned at some distance from one another. That is, the TRPs may not be co-located on the UE.
  • TRPs transmission-reception points
  • the UE may receive feedback at one of the TRPs or otherwise determine that transmissions from that TRP are subject to interference. In such cases, the TRP that received the feedback may rebroadcast the transmission with increased power, such that the receiving UE has a higher chance of receiving the transmission.
  • the RSRP measured by the receiving UE for both the initial transmission and the retransmission may be different, since the TRPs are not co-located (e.g., a TRP that is closer to the receiving UE retransmits with the increased power, which increases the received power at the receiving UE) .
  • the evaluation may be faulty or based on an RSRP measurement that is too low to account for the higher-power retransmissions. This may cause interference with subsequent transmissions by the initial transmitting UE, the receiving UE, or both.
  • aspects of the disclosure described herein provide for techniques for a transmitting UE to convey a reservation RSRP delta value that may be used by receiving UEs to evaluate resource reservations by the transmitting UE.
  • the reservation RSRP delta value may be based on a difference in transmission powers by the different TRPs of the transmitting UE, and may be added to the measured RSRP when evaluating the resources.
  • the receiving UE may account for a potential increase in transmission power in the reserved resources due to a power increase at a TRP of the transmitting UE. This may avoid or reduce the faulty evaluations that may cause interference during the reserved resources by a retransmission by the transmitting UE or by a transmission by the receiving UE.
  • the reservation RSRP delta value which may be referred to as P 0 herein, may be conveyed by the transmitting UE using a control messages, such as a radio resource control (RRC) message or a sidelink control information (SCI) message, which may be a type 1 SCI or a type 2 SCI.
  • RRC radio resource control
  • SCI sidelink control information
  • the P 0 values may be preconfigured at the UEs.
  • the described techniques may support improvements in the sidelink communication and resource reservation framework, decreasing signaling overhead, and improving reliability, among other advantages.
  • supported techniques may include improved network operations and, in some examples, may promote network efficiencies, among other benefits.
  • aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further described with respect to wireless communications systems and process flow diagrams Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to resource reservation with multi-TRP transmissions.
  • FIG. 1 illustrates an example of a wireless communications system 100 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • the wireless communications system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130.
  • the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • LTE-A Pro LTE-A Pro
  • NR New Radio
  • the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.
  • ultra-reliable e.g., mission critical
  • the base stations 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may be devices in different forms or having different capabilities.
  • the base stations 105 and the UEs 115 may wirelessly communicate via one or more communication links 125.
  • Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base station 105 may establish one or more communication links 125.
  • the coverage area 110 may be an example of a geographic area over which a base station 105 and a UE 115 may support the communication of signals according to one or more radio access technologies.
  • the UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times.
  • the UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1.
  • the UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, the base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) , as shown in FIG. 1.
  • network equipment e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment
  • the base stations 105 may communicate with the core network 130, or with one another, or both.
  • the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface) .
  • the base stations 105 may communicate with one another over the backhaul links 120 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) , or indirectly (e.g., via core network 130) , or both.
  • the backhaul links 120 may be or include one or more wireless links.
  • One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.
  • a base transceiver station a radio base station
  • an access point a radio transceiver
  • a NodeB an eNodeB (eNB)
  • eNB eNodeB
  • a next-generation NodeB or a giga-NodeB either of which may be referred to as a gNB
  • gNB giga-NodeB
  • a UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples.
  • a UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer.
  • PDA personal digital assistant
  • a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.
  • WLL wireless local loop
  • IoT Internet of Things
  • IoE Internet of Everything
  • MTC machine type communications
  • the UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
  • devices such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
  • the UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers.
  • the term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125.
  • a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR) .
  • BWP bandwidth part
  • Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling.
  • the wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation.
  • a UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration.
  • Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
  • a carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) and may be positioned according to a channel raster for discovery by the UEs 115.
  • E-UTRA evolved universal mobile telecommunication system terrestrial radio access
  • a carrier may be operated in a standalone mode where initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode where a connection is anchored using a different carrier (e.g., of the same or a different radio access technology) .
  • the communication links 125 shown in the wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115.
  • Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
  • a carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100.
  • the carrier bandwidth may be one of a number of determined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) .
  • Devices of the wireless communications system 100 e.g., the base stations 105, the UEs 115, or both
  • the wireless communications system 100 may include base stations 105 or UEs 115 that support simultaneous communications via carriers associated with multiple carrier bandwidths.
  • each served UE 115 may be configured for operating over portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.
  • Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
  • MCM multi-carrier modulation
  • OFDM orthogonal frequency division multiplexing
  • DFT-S-OFDM discrete Fourier transform spread OFDM
  • a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related.
  • the number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) .
  • a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams) , and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE 115.
  • One or more numerologies for a carrier may be supported, where a numerology may include a subcarrier spacing ( ⁇ f) and a cyclic prefix.
  • a carrier may be divided into one or more BWPs having the same or different numerologies.
  • a UE 115 may be configured with multiple BWPs.
  • a single BWP for a carrier may be active at a given time and communications for the UE 115 may be restricted to one or more active BWPs.
  • Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) .
  • Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
  • SFN system frame number
  • Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration.
  • a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of slots.
  • each frame may include a variable number of slots, and the number of slots may depend on subcarrier spacing.
  • Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) .
  • a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f ) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
  • a subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) .
  • TTI duration e.g., the number of symbol periods in a TTI
  • the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
  • Physical channels may be multiplexed on a carrier according to various techniques.
  • a physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
  • a control region e.g., a control resource set (CORESET)
  • CORESET control resource set
  • a control region for a physical control channel may be defined by a number of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier.
  • One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115.
  • one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner.
  • An aggregation level for a control channel candidate may refer to a number of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size.
  • Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.
  • Each base station 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof.
  • the term “cell” may refer to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) , or others) .
  • a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) over which the logical communication entity operates.
  • Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station 105.
  • a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas 110, among other examples.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell.
  • a small cell may be associated with a lower-powered base station 105, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells.
  • Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) .
  • a base station 105 may support one or multiple cells and may also support communications over the one or more cells using one or multiple component carriers.
  • a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) ) that may provide access for different types of devices.
  • protocol types e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB)
  • NB-IoT narrowband IoT
  • eMBB enhanced mobile broadband
  • a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110.
  • different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105.
  • the overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105.
  • the wireless communications system 100 may include, for example, a heterogeneous network in which different types of the base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.
  • the wireless communications system 100 may support synchronous or asynchronous operation.
  • the base stations 105 may have similar frame timings, and transmissions from different base stations 105 may be approximately aligned in time.
  • the base stations 105 may have different frame timings, and transmissions from different base stations 105 may, in some examples, not be aligned in time.
  • the techniques described herein may be used for either synchronous or asynchronous operations.
  • Some UEs 115 may be low cost or low complexity devices and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication) .
  • M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station 105 without human intervention.
  • M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application program that makes use of the information or presents the information to humans interacting with the application program.
  • Some UEs 115 may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
  • Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) .
  • half-duplex communications may be performed at a reduced peak rate.
  • Other power conservation techniques for the UEs 115 include entering a power saving deep sleep mode when not engaging in active communications, operating over a limited bandwidth (e.g., according to narrowband communications) , or a combination of these techniques.
  • some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs) ) within a carrier, within a guard-band of a carrier, or outside of a carrier.
  • a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs) ) within a carrier, within a guard-band of a carrier, or outside of a carrier.
  • the wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof.
  • the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications.
  • the UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) .
  • Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT) , mission critical video (MCVideo) , or mission critical data (MCData) .
  • MCPTT mission critical push-to-talk
  • MCVideo mission critical video
  • MCData mission critical data
  • Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications.
  • the terms ultra-reliable, low-latency, mission critical, and ultra-reliable low-latency may be used interchangeably herein.
  • a UE 115 may also be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol) .
  • D2D device-to-device
  • P2P peer-to-peer
  • One or more UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105.
  • Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105.
  • groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group.
  • a base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.
  • the D2D communication link 135 may be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs 115) .
  • vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these.
  • V2X vehicle-to-everything
  • V2V vehicle-to-vehicle
  • a vehicle may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to a V2X system.
  • vehicles in a V2X system may communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., base stations 105) using vehicle-to-network (V2N) communications, or with both.
  • V2N vehicle-to-network
  • the core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • the core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) .
  • EPC evolved packet core
  • 5GC 5G core
  • MME mobility management entity
  • AMF access and mobility management function
  • S-GW serving gateway
  • PDN Packet Data Network gateway
  • UPF user plane function
  • the control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130.
  • NAS non-access stratum
  • User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions.
  • the user plane entity may be connected to the network operators IP services 150.
  • the operators IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
  • Some of the network devices may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) .
  • Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) .
  • Each access network transmission entity 145 may include one or more antenna panels.
  • various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station 105) .
  • the wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) .
  • the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors.
  • the transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
  • HF high frequency
  • VHF very high frequency
  • the wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band, or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band.
  • SHF super high frequency
  • EHF extremely high frequency
  • the wireless communications system 100 may support millimeter wave (mmW) communications between the UEs 115 and the base stations 105, and EHF antennas of the respective devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate use of antenna arrays within a device.
  • mmW millimeter wave
  • the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions.
  • the techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.
  • the wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands.
  • the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • LAA License Assisted Access
  • LTE-U LTE-Unlicensed
  • NR NR technology
  • an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • devices such as the base stations 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance.
  • operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) .
  • Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
  • a base station 105 or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming.
  • the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming.
  • one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower.
  • antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations.
  • a base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115.
  • a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
  • an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.
  • the base stations 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing.
  • the multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas.
  • Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) .
  • Different spatial layers may be associated with different antenna ports used for channel measurement and reporting.
  • MIMO techniques include single-user MIMO (SU-MIMO) , where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) , where multiple spatial layers are transmitted to multiple devices.
  • SU-MIMO single-user MIMO
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device.
  • Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference.
  • the adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device.
  • the adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
  • a base station 105 or a UE 115 may use beam sweeping techniques as part of beam forming operations.
  • a base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115.
  • Some signals e.g., synchronization signals, reference signals, beam selection signals, or other control signals
  • the base station 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission.
  • Transmissions in different beam directions may be used to identify (e.g., by a transmitting device, such as a base station 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the base station 105.
  • a transmitting device such as a base station 105
  • a receiving device such as a UE 115
  • Some signals may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) .
  • the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted in one or more beam directions.
  • a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions and may report to the base station 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.
  • transmissions by a device may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from a base station 105 to a UE 115) .
  • the UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across a system bandwidth or one or more sub-bands.
  • the base station 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS) ) , which may be precoded or unprecoded.
  • a reference signal e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS)
  • CRS cell-specific reference signal
  • CSI-RS channel state information reference signal
  • the UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) .
  • PMI precoding matrix indicator
  • codebook-based feedback e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook
  • a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .
  • a receiving device may try multiple receive configurations (e.g., directional listening) when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals.
  • receive configurations e.g., directional listening
  • a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions.
  • receive beamforming weight sets e.g., different directional listening weight sets
  • a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) .
  • the single receive configuration may be aligned in a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .
  • SNR signal-to-noise ratio
  • the wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack.
  • communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based.
  • a Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels.
  • RLC Radio Link Control
  • a Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels.
  • the MAC layer may also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency.
  • the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 supporting radio bearers for user plane data.
  • RRC Radio Resource Control
  • transport channels may be mapped to physical channels.
  • the UEs 115 and the base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully.
  • Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that data is received correctly over a communication link 125.
  • HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) .
  • FEC forward error correction
  • ARQ automatic repeat request
  • HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions) .
  • a device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
  • the wireless communications system 100 may support sidelink communications between UEs 115.
  • the sidelink UEs 115 may transmit sidelink control messages, which may schedule resources for data messages and perform other functions, and sidelink data messages.
  • the sidelink control messages e.g., SCI
  • a control message may schedule a resource for a data message and one or more subsequent resources for potential retransmissions of the data message in case of negative feedback (e.g., a negative acknowledgment (NAK) ) .
  • NAK negative acknowledgment
  • the UE 115 may retransmit the data message using the reserved resources.
  • the receiving UEs 115 may use a measured a RSRP of the initial data transmission to evaluate the resource reservation of the subsequent resources. More particularly, the receiving UE 115 may evaluate which resources are available for its own transmission based on an RSRP measurement of the initial received data transmission. For example, the receiving UE may evaluate the RSRP of the initial data transmission to determine whether a retransmission on those reserved resource, with the same RSRP, may interfere with a transmission by the receiving UE 115 on the same resources. In some cases, the receiving UE 115 may consider a RSRP threshold that is contingent on the time domain location of the resource within a packet delay budget.
  • UEs 115 may be configured with multiple TRPs, which may be positioned at some distance from one another at the UE 115. For example, when a vehicle is configured as a UE 115, multiple TRPs may be positioned on the UE 115 such that the TRPs are not co-located at the UE 115.
  • a UE 115 broadcasts a transmission using multiple TRPs to nearby UEs (peers) (as in vehicle-to-everything transmissions (V2X) )
  • the UE 115 may receive negative feedback at one of the TRPs or otherwise determine that transmissions from that TRP are subject to interference.
  • the transmission may be rebroadcast with a different transmission power (than the initial transmission) from one or more of the multiple TRPs.
  • a TRP that receives negative feedback may rebroadcast the transmission with an increased transmission power to increase the likelihood that the transmission is successfully received at the receiving UE 115.
  • the RSRP measured by the receiving UE 115 for both the initial transmission and the retransmission may be different, since the TRPs are not co-located at the transmitting UE 115.
  • the evaluation may be faulty or based on an RSRP measurement that is too low to account for the higher-power retransmissions. This may cause interference with subsequent transmissions by the initial transmitting UE 115, the receiving UE 115, or both.
  • a transmitting UE 115 may convey a reservation RSRP delta value to receiving UEs 115, and the receiving UEs 115 may use the reservation RSRP delta value in conjunction with the RSRP of the initial transmission to evaluate reserved resources. For example, when a receiving UE 115 evaluates a reserved resource, the reservation RSRP delta value may be added the measured RSRP to evaluate the resource (e.g., relative to a corresponding threshold) . Accordingly, the reservation RSRP delta value may account for an increased RSRP of a subsequent transmission (e.g., a retransmission) by the transmitting UE 115 due to the varying transmission powers of multiple TRPs at the transmitting UE 115.
  • a subsequent transmission e.g., a retransmission
  • the reservation RSRP delta value (P 0 ) may be conveyed using RRC or SCI signaling. Further, different P 0 values may correspond to different TRPs of the transmitting UE 115.
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • wireless communications system 200 may implement aspects of wireless communication system 100.
  • the wireless communications system 200 includes UEs 115-a and 115-b, which may be examples of the corresponding devices as described with respect to FIG. 1.
  • the wireless communications system 200 illustrates various communications between the UEs 115-a and 115-b in accordance with aspects of the present disclosure.
  • FIG. 2. is illustrated in the context of V2X communications, but it should be understood that implementations described herein may be applicable to other D2D communications.
  • UE 115-a which is illustrated as a vehicle, may be implemented with multiple TRPs 205, such as TRP 205-a and TRP 205-b.
  • the TRPs may be referred to as antenna panels.
  • UE 115-a is implemented with a front antenna panel (e.g., TRP 205-a) and a rear antenna panel (e.g., TRP 205-b) .
  • larger vehicles such as trucks and trailers, may be implemented with multiple TRPs 205.
  • the hardware of the UE 115-a may be configured in various implementations.
  • the multiple TRPs 205-a and 205-b share common processing components, such as a RRC layer, medium access control (MAC) layer, and physical (PHY) layer and separate RF and digital processing circuitry.
  • MAC medium access control
  • PHY physical
  • the TRPs 205 may be separated by, for example, 3 to 4 meters. For larger vehicles or trucks, the panels may be separated by 20 meters. Due to the separation of the TRPs 205, the communication channels may have different environments (e.g., line of sight, non-line of sight, blocking, etc. ) .
  • each TRP 205 may have active links to a different number of peers (e.g., UEs 115 with which the UE may communicate) or different links to the peers. Traffic load may be higher for one TRP 205 than other (e.g., more UEs 115 in front or behind) , and TRP 205 may have various qualities of connections with UEs 115. Due to such variance, it may be beneficial to transmit with more or less power, different MCS, etc. from the different TRPs 205.
  • UE 115-a transmits a broadcast message using both TRPs 205.
  • a same transmission power 210-a and 210-b may be used for the broadcasts from the front TRP 205-a and the rear TRP 205-b, respectively.
  • the initial transmission powers 210 may be chosen to minimize self-interference, based on path-loss, etc.
  • one of the UEs 115-b transmits feedback 220 (e.g., a NAK) corresponding to the broadcast transmission. In some cases, the feedback 220 may be detected or received at one of the TRPs, such as the TRP 205-b.
  • feedback 220 e.g., a NAK
  • the UE 115-a may schedule or reserve additional resources with the initial transmission in case of a retransmission due to interference and/or feedback. More particularly, the initial transmission may include sidelink control information (SCI) that reserves resources for the retransmission.
  • SCI sidelink control information
  • the receiving UEs 115-b may measure an RSRP of the initial transmission and use the RSRP to evaluate the resource reservation for the potential retransmission. For example, the receiving UEs 115-b may use the RSRP of the initial transmission to determine whether a transmission, by the receiving UE 115-b, during one or more of the reserved resources may cause interference. In one example, this includes determining whether the RSRP is greater than a threshold.
  • the UE 115-b may determine a set of candidate resources to transmit.
  • the candidate set may choose from resources within a packet delay budget (PDB) window.
  • PDB packet delay budget
  • a resource may not be candidate if it overlaps with a resource reserved by the transmitting UE 115-a and the measured RSRP (by the receiving UE 115-b and of the initial transmission) is larger than a RSRP threshold.
  • the threshold may be dynamic and depend on a size of a candidate resource set size.
  • the RSRP of the initial transmission and the retransmission may be different based on the TRPs 205 used to perform the transmission and retransmission.
  • the basis for evaluating the resource reservation by the UE 115-b may be faulty. Accordingly, if one of the UEs 115-b determines to perform a transmission in a reserved resource based on the threshold comparison of the initial RSRP, then the transmission by the UE 115-b and the retransmission by the UE 115-a may interfere with each other. This potential interference may reduce reliability and efficiencies in a wireless communications system.
  • the UE 115-b may transmit a reservation RSRP delta value (P 0 value) , which may be referred to as protection information.
  • P 0 value may be selected by the UE 115-a based on a potential difference between transmission powers at the TRPs 205. For example, the UE 115-a may select the P 0 value for the TRP 205-b as the transmission power 210-a of the transmission at TRP 205-a.
  • the receiving UE 115-b may utilize the P 0 value and the RSRP to evaluate the resource reservation.
  • the receiving UE may compare the RSRP + P 0 value to the corresponding RSRP threshold (RSRP thresh ) . If RSRP + P 0 value is > RSRP thresh, then the receiving UE 115-b may determine to not transmit using the reserved resources. Otherwise, if RSRP + P 0 value ⁇ RSRP thresh , then the receiving UE 115-b may determine that the resources is a candidate for transmission. Thus, the receiving UE 115-b may be able to consider whether a retransmission with a greater RSRP (e.g., RSRP + P 0 value) may interfere with a transmission on the reserved resource.
  • RSRP thresh the UE may compare the RSRP + P 0 value to the corresponding RSRP threshold
  • the P 0 value may be configured differently for each different TRP 205 of the UE 115-a. Thus, if the UE detects multiple P 0 values, then the UE 115-b may select the proper P 0 value for evaluation based on various selection rules, or may utilize each P 0 value or a subset of P 0 values as described further herein.
  • the P 0 values may be indicated to the UE 115-b using RRC signaling (e.g., with the UE 115-a and UE 115-b are in a connected state) or using a SCI message. In some cases, one or more type 1 SCI messages may be used to convey the P 0 values. One or more type 2 SCI messages may also be used to convey the P 0 values.
  • a control message (e.g., physical sidelink control channel PSCCH) for each transmission (e.g., the initial transmission at 250-a and one or more retransmissions at 250-b) may be transmitted using the same transmission power, while the data transmissions (e.g., physical sidelink shared channel (PSSCH) ) may be transmitted using different transmission powers on the TRPs 205. That is, the data (PSSCH) may be transmitted with a power increment over one or more of the TRPs 205 based on prior feedback 220 or detected interference. This technique may provide medium protection.
  • PSCCH physical sidelink control channel
  • FIG. 3 illustrates an example of a wireless communications system 300 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • wireless communications system 300 may implement aspects of wireless communication system 100.
  • the wireless communications system 300 includes a UE 115-c and a UE 115-d, which may be examples of UEs 115 as described with respect to FIGs. 1 through 3.
  • the UE 115-c includes multiple TRPs 325 including a first TRP 325-a and a second TRP 325-b.
  • the U 115-c may broadcast a sidelink transmission 330 to various UEs 115 within an area, including UE 115-d.
  • the sidelink transmission may include a sidelink control message 305 and a sidelink data message 310.
  • the sidelink control message 305 includes an indication of at least one P 0 value 315.
  • the sidelink control message 305 may indicate that the UE 115-c is configured with multiple TRPs 325. However, this indication may be inferred based on the inclusion of the P 0 value 315.
  • the sidelink control message 305 may include an indication of a reservation of resources (e.g., reserved resources 315) that may be used for retransmission of the sidelink data message 310 in case of feedback or detected interference.
  • the control message 305 may be an example of a SCI message that contains reservation information (e.g., slots and resource blocks) that peers (e.g., transmitting UE 115-c) may use in the future.
  • the UE 115-c may determine RSRPs of any received SCIs from other UEs 115 that have reserved resources. If a SCI that is decoded has a high RSRP, then the peer may be determined to be in relatively close proximity to the UE 115-c.
  • the UE 115-c may remove those resources indicated in the SCI from the candidate set for reserving resources.
  • the UE 115-c may randomly select N resources for resource reservations. For every transmission (e.g., initial transmission) , the transmitting UE 115-c may serve resources for up to two re-transmissions in the future. For example, the UE 115-c selects reserved resources 315 for potential retransmissions of the data message 310. It should be understood that the additional SCI messages may be included in the retransmissions.
  • the control message 305 may include the P 0 value and the resource reservations indicating the reserved resources 315.
  • control message 305 that includes the indication of the P 0 value 315 may be separate from the SCI that includes the resource reservation.
  • the P 0 value may be indicated in RRC signaling, if the UE 115-c and the receiving UE 115-d are in a connected state.
  • the P 0 value 315 is indicated via a type 1 SCI (e.g., SCI-1) .
  • the SCI-1 message may be transmitted from the two (or multiple) TRPs 325.
  • the indicated value for P 0 may be the same or different for each TRP 325.
  • the front TRP 325-b e.g., front panel
  • the rear TRP 325-a may not make such a determination.
  • the SCI-1 sent from the front TRP 325-b may indicate a higher P 0 value.
  • the SCI-1 message sent from the rear TRP 325-a may contain no P 0 value or may indicate 0 db for a P 0 value.
  • the UE 115-d may evaluate the reserved resources 315 using one or more techniques.
  • the UE 115-d utilizes the P 0 value from the SCI-1 message with the highest or maximum RSRP.
  • the UE 115-d may utilize the maximum or highest P 0 value from SCIs decoded with RSRP greater than a particular threshold.
  • the UE 115-d may use the sum of the RSRP and the P 0 values for retransmission protection based on the following: where m SCI-s were decoded. The same equation may be used for RSRPs that are greater than some threshold, as described in the preceding example. Other methods of using multiple RSRPs and P 0 values are contemplated within the scope of the disclosure.
  • the P 0 value 315 may be indicated via type 2 SCI messaging (SCI-2) .
  • SCI-1 message may be the same for both (or all) transmissions from the various TRPs 325.
  • SCI-2 messages may contain a list of transmission configuration indicators (TCIs) , and each TCI may correspond to a port. Accordingly, a P 0 value may be indicated per port and each port may correspond to a TRP 325.
  • TCIs transmission configuration indicators
  • the UE 115-d may update the resource RSRP with either the P 0 value associated with a maximum or high RSRP or a sum of RSRP and P 0 value for retransmission to perform the evaluation. If however, a measured RSRP corresponding to one port dominates the RSRP measurements (e.g., RSRP 1 >> RSRP 2 ) , then the UE 115-d may evaluate using the P 0 value that associated with the higher RSRP.
  • the receiving UE 115-d may apply the protection (P 0 value) when the transmitting UE 115-c or a TRP 325 of the transmitting UE is within a given distance from the receiving UE 115-d.
  • the distance may be derived from information included in the SCI-2 message.
  • the P 0 value may be applied based on the distance derivable from the information included in the SCI-2 message whether the P 0 value is indicated via the SCI-1 message or the SCI-2 message. This distance based determination may exclude UEs 115, which may be at a further distance from the transmitting UE 115-c, from receiving more protection.
  • the receiving UE 115-d may determine the ratio of the RSRP from past measurements over the multiple TRPs 325. For example, for past time window, if TRP 325-a is 6 dB lower than the RSRP for TRP 325-b based on an observed ratio of measured power from the two TRPs 325. That is, if 80 dBm of 80 dBm of total power is received, the UE 115-d may estimate that RSRP from each TRP 325 is -81 dBm and -87 dBm, respectively. If the if the P 0 values on the two ports (e.g., TRPs 325) are 3 dB and 0 dB, the UE 115-d may update the RSRP to -79.2 dB.
  • CQI channel quality information
  • the UE 115-d may use various techniques to identify the P 0 value (s) 315 use for reservation evaluation and transmission resource selection.
  • the UE 115-d may select candidate resources 320-a for transmission. Since candidate resources 320-a does not overlap with reserved resources 315, the UE 115-d may use candidate resources 320-a for transmission. If however, the UE selects candidate resources 320-b or 320-c, then the UE 115-d may apply the P 0 values as described herein.
  • the UE compares the RSRP plus the P 0 value of the initial transmission (e.g., data message 310) to a corresponding RSRP threshold (RSRP thresh ) .
  • RSRP thresh corresponding RSRP threshold
  • the UE may not use candidate transmission resource 320-b for a transmission resources.
  • the UE 115 compares the RSRP and the P 0 value to the corresponding RSRP threshold (e.g., RSRP thresh ) . In this case, the UE determines that the RSRP + P 0 ⁇ RSRP thresh . As such, the UE 115-d may use the resources 320-c for a transmission.
  • the UE 115 may transmit the control message 305 using a same transmission power across the TRPs 325 for the initial transmission as well as the retransmission. However, the transmission power of the data message 310 may be different across the TRPs 325 for the initial data message 310 and the subsequent retransmission of the data message 310. This technique may provide medium protection.
  • FIG. 4 illustrates an example of a process flow diagram 400 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • process flow diagram 400 may implement aspects of wireless communication system 100.
  • the process flow diagram 400 includes a UE 115-e and a UE 115-f, which may be examples of the corresponding devices as described with respect to FIGs. 1 through 3.
  • UE 115-e may be configured with multiple TRPs.
  • feedback protection or resource reservation protection may be signaled using RRC signaling. This implementation may be used when two UEs 115 have “discovered” each other and have reached a RRC connected stated.
  • the multiple TRP UE (mTRP UE) 115-e may indicate, at 405, to the peer (e.g., the UE 115-f) that the UE 115-e is configured with multiple TRPs.
  • the UE 115-e may indicate the P 0 value.
  • the indication of the P 0 value functions as the indication of the mTRP.
  • both 405 and 410 may be performed by 410.
  • the indicated P 0 value may be used for successive retransmissions (Re-Tx) . That is, the resource exclusion RSRP for reserved resources may be set to P 0 value above a respective threshold.
  • the UE 115-e transmits from both (or multiple) TRPs with a transmission power P.
  • the transmission may include a control message (e.g., SCI message) that reserves resources.
  • the UE 115-e performs a retransmission of the initial transmission using one of the TRPs with a transmission power P + P 0 .
  • the retransmission may be performed using one or more of the reserved resources. This retransmission may be based on receipt of feedback at one or both TRPs, detection of interference, or the like.
  • the UE 115-e performs an additional retransmission of the initial transmission using one of the TRPs and with a transmission power P + 2P 0 .
  • this retransmission may be based on receipt of feedback at one or both TRPs, detection of interference, or the like.
  • the reserving or peer UE 115-f may evaluate the retransmission resources using the P 0 value.
  • the UE 115-f may be configured to evaluate the first retransmission resources using P 0 , the RSRP of the initial transmission, and the respective RSRP threshold. Further, the UE 115-f may be configured to evaluate the next retransmission resource using 2P 0 , the RSRP of the initial transmission, and the respective retransmission threshold.
  • a maximum number of increments of P 0 may be indicated. This number of increments may be an example of or correspond to a transmission power budget constraint. That is, the panels (TRPs) on the transmitter may be able transmit with at most a transmission power of P on the n-th Re-Tx. In some examples, the transmitter may also transmit at the same power on the nth Re-Tx as the first Re-Tx. Further, in some examples, the UE 115-e may transmit with a value below a current upper limit (e.g., based on a multiple of P 0 ) and within power budgets or constraints at the UE 115-e.
  • a current upper limit e.g., based on a multiple of P 0
  • the P 0 value may be preconfigured by a base station 105, a synchronizing UE 115, a hardware implementation, etc.
  • a UE 115 may receive and decoded multiple SCI messages. If a UE decodes two more SCI messages from a same transmitting UE 115 with varying RSRP, the UE 115 may determine that the transmitting UE 115 has multiple TRPs. If no P 0 value is indicated in the SCI message (SCI-1 or SCI-2) , then the receiving UE 115 may use the pre-configured P 0 value to protect the retransmission resources from the transmitting UE 115. In one example, it may protect the resources with a maximum RSRP + P 0 . In another example, the receiving UE 115 may protect the resources with the sum of RSRPs and using the P 0 value.
  • FIG. 5 illustrates an example of a process flow diagram 500 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • process flow diagram 500 may implement aspects of wireless communication system 100.
  • the process flow diagram 500 includes a UE 115-g and a UE 115-g, which may be an example of the corresponding devices of FIG. 1 through 4.
  • UE 115-g may be configured with multiple TRPs.
  • the UE 115-g and the UE 115-h may support sidelink communications over various sidelink channels including PSCCHs and PSSCHs.
  • the UEs 115-g and 115-h may be UEs 115 operating in a V2X environment or other type of D2D environment.
  • the UE 115-g may determine, based at least in part on the first UE 115-g having multiple transmitter-receiver points, a reservation reference signal received power (RSRP) delta value to be added to a measured signal power by other UEs in evaluating a resource reservation of the first UE 115-g.
  • the RSRP delta value may be determined based on a total transmission power to be used by the multiple RSRPs.
  • the UE 115-g may transmit a control message that includes an indication of the RSRP delta value to be applied by the other UEs in evaluating the resource reservation of the first UE.
  • the control message is an RRC message.
  • the control message is an SCI-1 or SCI-2 message that includes the indication of the reservation RSRP delta value.
  • the SCI-1 or SCI-2 message may reserve the resources for subsequent retransmissions.
  • a reservation RSRP delta value may be transmitted per port (per TRP) .
  • multiple reservation RSRP delta values may be indicated via TCI states included in a SCI-2 message.
  • the UE 115-g may transmit an initial sidelink data message using the multiple transmitter-receiver points in accordance with the control message.
  • the UE 115-h may measure the reference signal received power of the initial sidelink transmission that is received from the first UE 115-g.
  • the UE 115-h may evaluate the resource reservation of the first UE based at least in part on the reference signal received power and the reservation RSRP delta value.
  • the evaluation may include adding the measured RSRP and the RSRP delta value and comparing the result to a RSRP threshold that corresponds to a particular resources that is being evaluated.
  • the UE 115-h may select, from among multiple reservation RSRP delta values, a reservation RSRP delta value that corresponds to a maximum RSRP, multiple reservation RSRP delta values and RSRPs, or multiple reservation RSRP delta values that satisfy a threshold. Further, the UE 115-h may use past RSRP measurements per TRP.
  • the UE 115-h may determine one or more sidelink transmission resources to be used by the second UE based at least in part on the evaluation of the resource reservation of the first UE. In some cases, the determining may include not selecting a sidelink transmission resource if the measured RSRP + the reservation RSRP delta value is more than a corresponding threshold. The determining may include selecting a sidelink transmission resource if the measured RSRP + the reservation RSRP delta value is less than a corresponding threshold.
  • the UE 115-h may communicate using the one or more sidelink transmission resources. In some cases, this may include receiving a retransmission, at 540, of the initial sidelink transmission from the UE 115-g. In other cases, this may include transmitting in the reserved resources based on the resource evaluation.
  • FIG. 6 shows a block diagram 600 of a device 605 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • the device 605 may be an example of aspects of a UE 115 as described herein.
  • the device 605 may include a receiver 610, a communications manager 615, and a transmitter 620.
  • the device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to resource reservation with multi-TRP transmissions, etc. ) . Information may be passed on to other components of the device 605.
  • the receiver 610 may be an example of aspects of the transceiver 920 described with reference to FIG. 9.
  • the receiver 610 may utilize a single antenna or a set of antennas.
  • the communications manager 615 may determine, at the first UE and based on the first UE having multiple transmitter-receiver points, a reservation reference signal received power (RSRP) delta value to be added to a measured signal power by other UEs in evaluating a resource reservation of the first UE, transmit a control message that includes an indication of the RSRP delta value to be applied by the other UEs in evaluating the resource reservation of the first UE, and transmit an initial sidelink data message using the multiple transmitter-receiver points in accordance with the control message.
  • RSRP reservation reference signal received power
  • the communications manager 615 may also receive a message that includes an indication of a reservation reference signal received power (RSRP) delta value to be added to a measured reference signal received power used in evaluating a resource reservation of a first UE, measure the reference signal received power of an initial sidelink transmission that is received from the first UE, evaluate the resource reservation of the first UE based on the reference signal received power and the reservation RSRP delta value, determine one or more sidelink transmission resources to be used by the second UE based on the evaluation of the resource reservation of the first UE, and communicate using the one or more sidelink transmission resources.
  • the communications manager 615 may be an example of aspects of the communications manager 910 described herein.
  • the communications manager 615 may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 615, or its sub-components may be executed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC) , a FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • code e.g., software or firmware
  • ASIC application-specific integrated circuit
  • the communications manager 615 may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components.
  • the communications manager 615, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the communications manager 615, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • the transmitter 620 may transmit signals generated by other components of the device 605.
  • the transmitter 620 may be collocated with a receiver 610 in a transceiver.
  • the transmitter 620 may be an example of aspects of the transceiver 920 described with reference to FIG. 9.
  • the transmitter 620 may utilize a single antenna or a set of antennas.
  • FIG. 7 shows a block diagram 700 of a device 705 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • the device 705 may be an example of aspects of a device 605, or a UE 115 as described herein.
  • the device 705 may include a receiver 710, a communications manager 715, and a transmitter 755.
  • the device 705 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to resource reservation with multi-TRP transmissions, etc. ) . Information may be passed on to other components of the device 705.
  • the receiver 710 may be an example of aspects of the transceiver 920 described with reference to FIG. 9.
  • the receiver 710 may utilize a single antenna or a set of antennas.
  • the communications manager 715 may be an example of aspects of the communications manager 615 as described herein.
  • the communications manager 715 may include a reservation RSRP delta value component 720, a control message interface 725, a data message interface 730, a RSRP component 735, a resource evaluation component 740, a sidelink resource component 745, and a communication interface 750.
  • the communications manager 715 may be an example of aspects of the communications manager 910 described herein.
  • the reservation RSRP delta value component 720 may determine, at the first UE and based on the first UE having multiple transmitter-receiver points, a reservation reference signal received power (RSRP) delta value to be added to a measured signal power by other UEs in evaluating a resource reservation of the first UE.
  • RSRP reservation reference signal received power
  • the control message interface 725 may transmit a control message that includes an indication of the RSRP delta value to be applied by the other UEs in evaluating the resource reservation of the first UE.
  • the data message interface 730 may transmit an initial sidelink data message using the multiple transmitter-receiver points in accordance with the control message.
  • the control message interface 725 may receive a message that includes an indication of a reservation reference signal received power (RSRP) delta value to be added to a measured reference signal received power used in evaluating a resource reservation of a first UE.
  • RSRP reservation reference signal received power
  • the RSRP component 735 may measure the reference signal received power of an initial sidelink transmission that is received from the first UE.
  • the resource evaluation component 740 may evaluate the resource reservation of the first UE based on the reference signal received power and the reservation RSRP delta value.
  • the sidelink resource component 745 may determine one or more sidelink transmission resources to be used by the second UE based on the evaluation of the resource reservation of the first UE.
  • the communication interface 750 may communicate using the one or more sidelink transmission resources.
  • the transmitter 755 may transmit signals generated by other components of the device 705.
  • the transmitter 755 may be collocated with a receiver 710 in a transceiver.
  • the transmitter 755 may be an example of aspects of the transceiver 920 described with reference to FIG. 9.
  • the transmitter 755 may utilize a single antenna or a set of antennas.
  • FIG. 8 shows a block diagram 800 of a communications manager 805 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • the communications manager 805 may be an example of aspects of a communications manager 615, a communications manager 715, or a communications manager 910 described herein.
  • the communications manager 805 may include a reservation RSRP delta value component 810, a control message interface 815, a data message interface 820, a SCI component 825, a RRC component 830, a feedback component 835, a retransmission component 840, a transmission power component 845, a RSRP component 850, a resource evaluation component 855, a sidelink resource component 860, and a communication interface 865.
  • Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the reservation RSRP delta value component 810 may determine, at the first UE and based on the first UE having multiple transmitter-receiver points, a reservation reference signal received power (RSRP) delta value to be added to a measured signal power by other UEs in evaluating a resource reservation of the first UE.
  • RSRP reservation reference signal received power
  • the reservation RSRP delta value component 810 may determine the reservation RSRP delta value for the first transmitter-receiver point based on determining that the transmission from the first transmitter-receiver point has the higher probability of interference.
  • the reservation RSRP delta value component 810 may identify the indication of the reservation RSRP delta value for each transmitter-receiver point based on a transmission configuration state index of the at least one control message.
  • the control message interface 815 may transmit a control message that includes an indication of the RSRP delta value to be applied by the other UEs in evaluating the resource reservation of the first UE.
  • control message interface 815 may receive a message that includes an indication of a reservation reference signal received power (RSRP) delta value to be added to a measured reference signal received power used in evaluating a resource reservation of a first UE.
  • RSRP reservation reference signal received power
  • control message interface 815 may include, within the control message, an indication that the first UE is configured with the multiple transmitter-receiver points.
  • control message interface 815 may transmit the control message for each transmitter-receiver point of the multiple transmitter-receiver points, at least one control message including the indication of a respective reservation RSRP delta value for a corresponding transmitter-receiver point.
  • control message interface 815 may transmit the control message for each transmitter-receiver point of the multiple transmitter-receiver points, each control message including the indication of a respective reservation RSRP delta value for a corresponding transmitter-receiver point.
  • control message interface 815 may transmit a subsequent control message that has a same transmission power of the control message that includes the indication of the reservation RSRP delta value, while varying transmission power of subsequent data messages based on the reservation RSRP delta value.
  • control message interface 815 may receive, within the control message an indication that the first UE is configured with multiple transmitter-receiver points.
  • control message interface 815 may receive at least one control message that that includes the indication of the reservation RSRP delta value for each transmitter-receiver point of multiple transmitter-receiver points of the first UE.
  • control message interface 815 may receive, from the first UE, a radio resource control message that indicates the reservation RSRP delta value.
  • control message interface 815 may receive, from a base station, a configuration for the reservation RSRP delta value.
  • control message interface 815 may receive, from the first UE, a sidelink control information message that indicates a different reservation RSRP delta value, where evaluating the resource reservation is based on the different reservation RSRP delta value.
  • each reservation RSRP delta value for each transmitter-receiver point of the multiple transmitter-receiver points is a same value. In some cases, each reservation RSRP delta value for each transmitter-receiver point of the multiple transmitter-receiver points is a different value. In some cases, each of the multiple control message includes a first of two control information messages. In some cases, the at least one control message includes a second of two sidelink control information messages.
  • the data message interface 820 may transmit an initial sidelink data message using the multiple transmitter-receiver points in accordance with the control message.
  • the data message interface 820 may transmit one or more subsequent sidelink data messages at one or more of the multiple transmitter-receiver points, each subsequent sidelink data message transmitted with a transmission power incremented by the reservation RSRP delta value in successive transmissions.
  • the data message interface 820 may transmit the one or more subsequent data message based on a power budget or a transmission quantity budget.
  • the RSRP component 850 may measure the reference signal received power of an initial sidelink transmission that is received from the first UE.
  • the RSRP component 850 may determine a difference between a measured reference signal received power corresponding to each transmitter-receiver point of the multiple transmitter-receiver points is less than or equal to the resource reservation threshold.
  • the RSRP component 850 may determine a difference between a reference signal received power corresponding to each transmitter-receiver point of the multiple transmitter-receiver points is greater than or equal to the resource reservation threshold.
  • the resource evaluation component 855 may evaluate the resource reservation of the first UE based on the reference signal received power and the reservation RSRP delta value.
  • the resource evaluation component 855 may evaluate the resource reservation based on a maximum reference signal received power of the initial sidelink transmission that is transmitted via each of the multiple transmitter-receiver points.
  • the resource evaluation component 855 may evaluate the resource reservation based on a maximum reference signal received power of the initial sidelink transmission that is transmitted via each of the multiple transmitter-receiver points that have reference signal received powers that satisfy a threshold reference signal received power, where the reference signal received power used for evaluating the resource reservation is based on a sum of the reference signal received powers that satisfy the threshold reference signal received power.
  • the resource evaluation component 855 may evaluate the resource reservation based on a reference signal received power of the initial sidelink transmission that is transmitted via each of the multiple transmitter-receiver points and a reservation RSRP delta value indicated by each of the multiple control messages.
  • the resource evaluation component 855 may evaluate the resource reservation based on a maximum reference signal received power corresponding to each transmitter-receiver point or based on a sum of the reference signal received power of the multiple transmitter-receiver points and a respective reservation RSRP delta value.
  • the resource evaluation component 855 may evaluate the resource reservation based on the reservation RSRP delta value corresponding to a maximum reference signal received power corresponding to each transmitter-receiver point.
  • the resource evaluation component 855 may evaluate the resource reservation based on one or more prior reference signal received power measurements corresponding to the multiple transmission-receiver points.
  • the resource evaluation component 855 may evaluate the one or more sidelink transmission resources based on incrementing the reservation RSRP delta value for each subsequent sidelink transmission resource of the one or more sidelink transmission resources.
  • the resource evaluation component 855 may evaluate the resource reservation based on a maximum reference signal received power of the initial sidelink transmission that is transmitted via each of transmitter-receiver points of multiple transmitter-receiver points of the first UE and the reservation RSRP delta value received from the base station.
  • the resource evaluation component 855 may evaluate the resource reservation based on a sum of reference signal received powers of the initial sidelink transmission that is transmitted via each transmitter-receiver point of multiple transmitter-receiver points of the first UE and the reservation RSRP delta value received from the base station.
  • the resource evaluation component 855 may evaluate the resource reservation of the first UE using the reservation RSRP delta value based on a distance between the first UE and the second UE, the distance being indicated by the message.
  • the sidelink resource component 860 may determine one or more sidelink transmission resources to be used by the second UE based on the evaluation of the resource reservation of the first UE.
  • the communication interface 865 may communicate using the one or more sidelink transmission resources.
  • the SCI component 825 may transmit a sidelink control information message that includes the indication of the reservation RSRP delta value and the resource reservation.
  • the SCI component 825 may transmit at least one sidelink control information message that includes the indication of the reservation RSRP delta value for each transmitter-receiver point of the multiple transmitter-receiver points.
  • the SCI component 825 may include, within the at least one sidelink control information message, the indication of the reservation RSRP delta value for each transmitter-receiver point using a set of transmission configuration state index values.
  • the SCI component 825 may receive a sidelink control information message that includes the indication of the reservation RSRP delta value and the resource reservation.
  • the SCI component 825 may receive multiple control messages, each control message corresponding to a transmitter-receiver point of multiple transmitter-receiver points of the first UE and at least one control message including an indication of a respective reservation RSRP delta value.
  • the SCI component 825 may receive multiple control messages, each control message corresponding to a transmitter-receiver point of multiple transmitter-receiver points of the first UE and including an indication of a respective reservation RSRP delta value.
  • each control message includes a first of two sidelink control information messages. In some cases, the at least one sidelink control information message includes a second of two sidelink control information messages.
  • the RRC component 830 may transmit a radio resource control message that includes the indication of the reservation RSRP delta value.
  • the feedback component 835 may receive feedback corresponding to the initial transmission at one or more of the multiple transmitter-receiver points.
  • the feedback component 835 may transmit, to the first UE, feedback associated with a data transmission corresponding to the initial sidelink transmission.
  • the retransmission component 840 may transmit a retransmission of the sidelink data message at the one or more of the multiple transmitter-receiver points and using a retransmission power determined in accordance with the control message based on receiving the feedback.
  • the retransmission component 840 may monitor for a retransmission by the first UE of the data transmission based on the resource reservation and the reservation RSRP delta value.
  • the transmission power component 845 may determine the retransmission power that is greater than a transmission power of the initial sidelink transmission by incrementing the transmission power of the initial sidelink transmission by an amount that is less than or equal to the reservation RSRP delta value.
  • the transmission power component 845 may determine that a transmission from a first transmitter-receiver point of the multiple transmitter-receiver points has a higher probability of interference than a transmission from a second transmitter-receiver point of the multiple transmitter-receiver points.
  • FIG. 9 shows a diagram of a system 900 including a device 905 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • the device 905 may be an example of or include the components of device 605, device 705, or a UE 115 as described herein.
  • the device 905 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 910, an I/O controller 915, a transceiver 920, an antenna 925, memory 930, and a processor 940. These components may be in electronic communication via one or more buses (e.g., bus 945) .
  • buses e.g., bus 945
  • the communications manager 910 may determine, at the first UE and based on the first UE having multiple transmitter-receiver points, a reservation reference signal received power (RSRP) delta value to be added to a measured signal power by other UEs in evaluating a resource reservation of the first UE, transmit a control message that includes an indication of the RSRP delta value to be applied by the other UEs in evaluating the resource reservation of the first UE, and transmit an initial sidelink data message using the multiple transmitter-receiver points in accordance with the control message.
  • RSRP reservation reference signal received power
  • the communications manager 910 may also receive a message that includes an indication of a reservation reference signal received power (RSRP) delta value to be added to a measured reference signal received power used in evaluating a resource reservation of a first UE, measure the reference signal received power of an initial sidelink transmission that is received from the first UE, evaluate the resource reservation of the first UE based on the reference signal received power and the reservation RSRP delta value, determine one or more sidelink transmission resources to be used by the second UE based on the evaluation of the resource reservation of the first UE, and communicate using the one or more sidelink transmission resources.
  • RSRP reservation reference signal received power
  • the I/O controller 915 may manage input and output signals for the device 905.
  • the I/O controller 915 may also manage peripherals not integrated into the device 905.
  • the I/O controller 915 may represent a physical connection or port to an external peripheral.
  • the I/O controller 915 may utilize an operating system such as or another known operating system.
  • the I/O controller 915 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device.
  • the I/O controller 915 may be implemented as part of a processor.
  • a user may interact with the device 905 via the I/O controller 915 or via hardware components controlled by the I/O controller 915.
  • the transceiver 920 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 920 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 920 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 925. However, in some cases the device may have more than one antenna 925, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 930 may include RAM and ROM.
  • the memory 930 may store computer-readable, computer-executable code 935 including instructions that, when executed, cause the processor to perform various functions described herein.
  • the memory 930 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • the processor 940 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 940 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 940.
  • the processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting resource reservation with multi-TRP transmissions) .
  • the code 935 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 935 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 935 may not be directly executable by the processor 940 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 10 shows a flowchart illustrating a method 1000 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • the operations of method 1000 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1000 may be performed by a communications manager as described with reference to FIGs. 6 through 9.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may determine, at the first UE and based on the first UE having multiple transmitter-receiver points, a reservation reference signal received power (RSRP) delta value to be added to a measured signal power by other UEs in evaluating a resource reservation of the first UE.
  • RSRP reservation reference signal received power
  • the operations of 1005 may be performed according to the methods described herein. In some examples, aspects of the operations of 1005 may be performed by a reservation RSRP delta value component as described with reference to FIGs. 6 through 9.
  • the UE may transmit a control message that includes an indication of the RSRP delta value to be applied by the other UEs in evaluating the resource reservation of the first UE.
  • the operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be performed by a control message interface as described with reference to FIGs. 6 through 9.
  • the UE may transmit an initial sidelink data message using the multiple transmitter-receiver points in accordance with the control message.
  • the operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operations of 1015 may be performed by a data message interface as described with reference to FIGs. 6 through 9.
  • FIG. 11 shows a flowchart illustrating a method 1100 that supports resource reservation with multi-TRP transmissions in accordance with aspects of the present disclosure.
  • the operations of method 1100 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1100 may be performed by a communications manager as described with reference to FIGs. 6 through 9.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may receive a message that includes an indication of a reservation reference signal received power (RSRP) delta value to be added to a measured reference signal received power used in evaluating a resource reservation of a first UE.
  • RSRP reservation reference signal received power
  • the operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed by a control message interface as described with reference to FIGs. 6 through 9.
  • the UE may measure the reference signal received power of an initial sidelink transmission that is received from the first UE.
  • the operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed by a RSRP component as described with reference to FIGs. 6 through 9.
  • the UE may evaluate the resource reservation of the first UE based on the reference signal received power and the reservation RSRP delta value.
  • the operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed by a resource evaluation component as described with reference to FIGs. 6 through 9.
  • the UE may determine one or more sidelink transmission resources to be used by the second UE based on the evaluation of the resource reservation of the first UE.
  • the operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be performed by a sidelink resource component as described with reference to FIGs. 6 through 9.
  • the UE may communicate using the one or more sidelink transmission resources.
  • the operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be performed by a communication interface as described with reference to FIGs. 6 through 9.
  • LTE, LTE-A, LTE-A Pro, or NR may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks.
  • the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
  • UMB Ultra Mobile Broadband
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Institute of Electrical and Electronics Engineers
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special purpose computer.
  • non-transitory computer-readable media may include random-access memory (RAM) , read-only memory (ROM) , electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • flash memory compact disk (CD) ROM or other optical disk storage
  • CD compact disk
  • magnetic disk storage or other magnetic storage devices or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer,
  • Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne des procédés, des systèmes et des dispositifs de communications sans fil. Un équipement d'utilisateur (UE) émetteur peut faire parvenir une valeur différentielle de RSRP de réservation à des UE récepteurs, et les UE récepteurs peuvent utiliser la valeur différentielle de RSRP de réservation en conjonction avec la RSRP de la transmission initiale pour évaluer des ressources réservées. Par exemple, lorsqu'un UE récepteur évalue une ressource réservée, la valeur différentielle de RSRP de réservation peut être ajoutée à la RSRP mesurée pour évaluer la ressource (p.ex. par rapport à un seuil correspondant). En conséquence, la valeur différentielle de RSRP de réservation peut tenir compte d'une RSRP accrue d'une transmission subséquente (p.ex. une retransmission) par l'UE émetteur du fait des puissances d'émission variables de points d'émission-réception (TRP) multiples au niveau de l'UE émetteur.
PCT/CN2020/101402 2020-07-10 2020-07-10 Réservation de ressources avec transmissions à trp multiples WO2022006872A1 (fr)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2017171521A1 (fr) * 2016-04-01 2017-10-05 Samsung Electronics Co., Ltd. Procédé et équipement pour la transmission de signal de synchronisation et de canal de diffusion de liaison latérale physique (psbch) en communication v2x
WO2017171895A1 (fr) * 2016-04-01 2017-10-05 Intel Corporation Adaptation de liaison pour communication de dispositif à dispositif (d2d) de faible complexité
WO2018160048A1 (fr) * 2017-03-03 2018-09-07 엘지전자 주식회사 Procédé de mesure de puissance de réception de signal d'un terminal dans un système de communication sans fil et terminal utilisant ce procédé
WO2018174630A1 (fr) * 2017-03-24 2018-09-27 Samsung Electronics Co., Ltd. Procédé et dispositif de transmission de données

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017171521A1 (fr) * 2016-04-01 2017-10-05 Samsung Electronics Co., Ltd. Procédé et équipement pour la transmission de signal de synchronisation et de canal de diffusion de liaison latérale physique (psbch) en communication v2x
WO2017171895A1 (fr) * 2016-04-01 2017-10-05 Intel Corporation Adaptation de liaison pour communication de dispositif à dispositif (d2d) de faible complexité
WO2018160048A1 (fr) * 2017-03-03 2018-09-07 엘지전자 주식회사 Procédé de mesure de puissance de réception de signal d'un terminal dans un système de communication sans fil et terminal utilisant ce procédé
WO2018174630A1 (fr) * 2017-03-24 2018-09-27 Samsung Electronics Co., Ltd. Procédé et dispositif de transmission de données

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