WO2020126114A1 - Schéma de commande de puissance de transmission sélective par faisceau - Google Patents

Schéma de commande de puissance de transmission sélective par faisceau Download PDF

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Publication number
WO2020126114A1
WO2020126114A1 PCT/EP2019/060792 EP2019060792W WO2020126114A1 WO 2020126114 A1 WO2020126114 A1 WO 2020126114A1 EP 2019060792 W EP2019060792 W EP 2019060792W WO 2020126114 A1 WO2020126114 A1 WO 2020126114A1
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WO
WIPO (PCT)
Prior art keywords
sidelink
transmission power
path loss
formed resource
wireless communication
Prior art date
Application number
PCT/EP2019/060792
Other languages
English (en)
Inventor
Richard Stirling-Gallacher
Mario Castaneda
Zhongfeng Li
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP19719327.9A priority Critical patent/EP3895335A1/fr
Priority to CN201980085860.0A priority patent/CN113228530B/zh
Publication of WO2020126114A1 publication Critical patent/WO2020126114A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
    • 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
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • 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
    • 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
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity

Definitions

  • the present invention relates to transmission power control performed at a wireless communication device or user equipment (UE).
  • UE user equipment
  • the invention provides a UE for performing beam-selective transmission power control, and provides a device, for example, a network device like a Transmit Receive Point (TRP), for configuring the beam- selective transmission power control at the UE.
  • TRP Transmit Receive Point
  • the invention also proposes corresponding transmission power control methods.
  • BACKGROUND Transmission power control is needed, for example, for 5G NR sidelinks (i.e. UE to UE links).
  • 5G NR sidelinks i.e. UE to UE links.
  • conventional UE power control schemes e.g. 5G NR Uplink and LTE sidelink.
  • a power control scheme is needed, which optimizes sidelink performance for a wanted direction, and at the same time minimizes interference to co-channel and /or adjacent channel users (e.g. Uu uplink or other adjacent channel sidelinks).
  • the conventional power control schemes are not suitable for this in their present form.
  • the conventional 5G NR sidelink power control scheme may be open- loop based, which means that the power control is just based on open-loop measurements made at the UE.
  • the 5G NR sidelink power control can be a closed- loop based power control, which means that it uses a combination of open-loop measurements made at the UE and closed control signals from e.g. the serving TRP/gNB or another communication entity (e.g. a UE).
  • Conventional UE power control schemes include:
  • the LTE V2x / D2D sidelink power control (Release 12, 13 and 14 of LTE V2x) scheme is an open-loop scheme, which was originally designed to minimize the sidelink transmission power, such that it does not cause interference to the uplink user allocated in the adjacent band.
  • the UE makes downlink measurements of the received signal from the base station, and calculates the downlink pathloss (PL).
  • PL downlink pathloss
  • Po eNodeB received power per resource block (RB) assuming OdB pathloss.
  • PMAX Maximum power that the UE can transmit.
  • this sidelink power control scheme only depends on the received path loss of the base station. This means that the transmission power for the sidelink increases as the UE moves away from the base station, but may not necessarily be the optimum power level for the side link itself. This is not suitable for 5G NR sidelink, because what is needed is:
  • LTE With respect to the LTE uplink power control scheme, LTE defines open- and closed-loop power control schemes for uplink power control.
  • the closed-loop scheme can be summarized by the equation below:
  • UE transmit power P Q + a PL + D TR + f TPC + 10 log 10 M
  • the UE performs open-loop path loss measurements from the base station, and power control commands (dynamic offset part of the equation) are received from base station.
  • 5G NR specifies different uplink schemes for beam based power control for different types of signals that the UE can transmit, namely Physical Uplink Shared Channel (PUSCH), physical uplink control channel (PUCCH), sounding reference signal (SRS) or physical random access channel (P- RACH).
  • PUSCH Physical Uplink Shared Channel
  • PUCCH physical uplink control channel
  • SRS sounding reference signal
  • P- RACH physical random access channel
  • an objective is in particular to provide a wireless communication device for beam-selective transmission power control, and another device, particularly a network device, for supporting the beam-selective transmission power control.
  • a transmission power control which is suitable for a sidelink
  • the transmission power control at the UE should be beam-based.
  • the proposed devices should be able to make and use path loss measurements from other sidelinks (wanted and unwanted transmission directions) in addition to path loss measurements from e.g. the network device.
  • the option for implementing both closed- loop and open-loop power control is desired.
  • the embodiments of the invention propose a detailed, 5G NR compatible, beam-based sidelink transmission power control scheme, exemplarily for three different types of signal:
  • PS-SCH Physical Sidelink Shared Channel
  • PS-CCH Physical Sidelink Control Channel
  • PS-SRS Physical Sidelink Sounding Reference
  • the embodiments of the invention allow taking into account beam-formed reference signals from e.g. a network device and from at least one other sidelink (wanted or unwanted transmission direction).
  • the transmission power for wanted sidelink directions can be optimized, and the signal power radiated in other unwanted transmission directions can be controlled as well.
  • a first aspect of the invention provides a wireless communication device (UE) for performing beam-selective transmission power control, the UE being configured to: receive, particularly from the power control configuring device (PCCD) (i.e. network entity, TRP, gNB etc..), a first parameter of a downlink beam-formed resource from a PCCD to the UE and a second parameter of a sidelink beam- formed resource from a second UE to the UE, measure a first path loss based on the first parameter and a second path loss based on the second parameter, and determine, based on the first and second path losses and according to a preconfigured determination scheme, a transmission power for a sidelink beam- formed resource to the second UE.
  • PCCD power control configuring device
  • the PCCD may be a 5G NR transmit receive point (TRP), a 5G next generation Node B (gNB), an evolved Node B(eNB), a secondary Node B (SeNB), a base station, or a remote radio head (RRH) or another UE.
  • the UE may be a mobile device, e.g. phone, but may particularly be installed at or in a vehicle e.g. car. That is, the sidelink beam-formed resource may be related to a V2V link.
  • the preconfigured scheme may be a formula or algorithm implemented at the UE, which yields - based on the path losses - an optimized transmission power for the side-link beam formed resource to the second UE (wanted sidelink transmission direction).
  • the beamforming at the UE may be formed by any kind of beam-forming method (i.e. digital, RF, hybrid beam-forming) and the different beamforming directions at the UE may be different beam directions from a single beam-forming array, panel or antenna element, or from one or more beam-forming arrays, panels, or antenna elements. Furthermore, in some implementations, each beam-forming array, panel or antenna elements could also form a single fixed beam directions.
  • a panel may be defined as a set of co-located antenna elements.
  • the UE of the first aspect is enabled to perform a transmission power control suitable for the sidelink, e.g. 5G NR side link, and beam-based, i.e. per beam.
  • a transmission power control suitable for the sidelink e.g. 5G NR side link
  • beam-based i.e. per beam.
  • the wireless communication device is further configured to determine, based on the first and second path losses, a transmission power for an uplink beam formed resource to the PCCD.
  • a transmission power control at the UE is also enabled (and optimized) for the uplink beam-formed resource to the PCCD (unwanted transmission direction), or any other supporting device. That is, interference to the uplink channel, when transmitting to the second UE via the sidelink channel, can be avoided.
  • a spatial direction at the UE associated with the downlink received beam-formed resource from the PCCD to the UE corresponds to a spatial direction associated with the uplink beam- formed resource to the PCCD.
  • a spatial direction at the UE associated with the sidelink received beam- formed resource from the second UE to the UE corresponds to a spatial direction associated with the sidelink beam- formed resource to the second UE.
  • the transmission power control for the sidelink beam- formed resource to the second UE can be accurately performed.
  • the wireless communication device is further configured to determine the transmission power based on one or more predetermined weighting factors respectively applied to the first path loss and/or to the second path loss.
  • the wireless communication device is further configured to determine the transmission power based on a minimum of the weighted first path loss and the weighted second path loss.
  • the wireless communication device is further configured to determine the transmission power based on predetermined target transmission powers predefined for the zero path losses for the downlink beam-formed resource from the PCCD to the UE and the sidelink beam-formed resource from the second UE to the UE respectively.
  • the wireless communication device is further configured to receive a third parameter of a sidelink beam-formed resource from a third UE to the UE, measure a third path loss based on the third parameter, and determine, based on one, some, or all the measured path losses, the transmission power for the sidelink beam- formed resource to the second UE and/or a sidelink beam-formed resource to the third UE.
  • the UE of the first aspect is able to make and use path loss measurements from other sidelinks (wanted and/or unwanted transmission directions) in addition to path loss measurements from the PCCD.
  • the wireless communication device is further configured to determine, based on the one, some, or all the measured path losses, a transmission power for an uplink beam formed resource to the PCCD.
  • the sidelink beam-formed resource to the second UE is associated with a spatial direction for transmission
  • the sidelink beam-formed resource to the third UE is associated with a further spatial direction for transmission.
  • the sidelink beam-formed resource to the second UE is associated with a spatial direction for transmission, and the sidelink beam- formed resource to the third UE associated with a further spatial direction for transmission is decreased, in particular such that the sidelink beam-formed resource has lower transmission power than the sidelink beam-formed resource to the second UE.
  • the wireless communication device is further configured to determine the transmission power based on predetermined weighting factors respectively applied to the second path loss and the third path loss.
  • the wireless communication device is further configured to determine the transmission power based on a predetermined collective function applied to the second path loss and the third path loss.
  • the predetermined collective function comprises a mean, a median, a minimum, a maximum, a sum, or a weighted sum of the second path loss and the third path loss.
  • the wireless communication device is further configured to determine the transmission power for transmission on a Physical Sidelink Shared Channel, PS-SCH, Physical Sidelink Control Channel, PS-CCH, and/or Physical Sidelink Sounding Reference, PS-SRS.
  • PS-SCH Physical Sidelink Shared Channel
  • PS-CCH Physical Sidelink Control Channel
  • PS-SRS Physical Sidelink Sounding Reference
  • the preconfigured determination scheme is an open-loop scheme based only on path loss measurements, or the preconfigured determination scheme is a closed-loop scheme based on path loss measurements and one or more power control commands received by the UE, particularly from the PCCD.
  • a second aspect of the invention provides a device for supporting beam-selective transmission power control performed by a wireless communication device (UE) the device being configured to transmit, particularly to the UE, a first parameter of a downlink beam- formed resource from the device to the UE and a second parameter of a sidelink beam- formed resource from a second UE to the UE.
  • UE wireless communication device
  • the device is further configured to: transmit, particularly to the UE, a third parameter of a sidelink beam- formed resource from a third UE to the UE, and/or transmit, particularly to the UE, one or more power control commands.
  • a third aspect of the invention provides a method for performing beam-selective transmission power control at a wireless communication device (UE), the method comprising: receiving, particularly from a power control configuring device (PCCD), a first parameter of a downlink beam-formed resource from the PCCD to the UE and a second parameter of a sidelink beam-formed resource from a second UE to the UE, measure a first path loss based on the first parameter and a second path loss based on the second parameter, determine based on the first and second path losses and according to a preconfigured determination scheme, a transmission power for a sidelink beam-formed resource from the UE to the second UE.
  • PCCD power control configuring device
  • the method comprises determining, based on the first and second path losses, a transmission power for an uplink beam formed resource to the PCCD.
  • a spatial direction at the UE associated with the downlink received beam-formed resource from the PCCD to the UE corresponds to a spatial direction associated with the uplink beam- formed resource to the PCCD.
  • a spatial direction at the UE associated with the sidelink received beam- formed resource from the second UE to the UE corresponds to a spatial direction associated with the sidelink beam- formed resource to the second UE.
  • the method comprises determining the transmission power based on one or more predetermined weighting factors respectively applied to the first path loss and/or to the second path loss.
  • the method comprises determining the transmission power based on a minimum of the weighted first path loss and the weighted second path loss.
  • the method comprises determining the transmission power based on predetermined target transmission powers predefined for the zero path losses for the downlink beam- formed resource from the PCCD to the UE and the sidelink beam- formed resource from the second UE to the UE respectively.
  • the method comprises receiving a third parameter of a sidelink beam- formed resource from a third UE to the UE, measuring a third path loss based on the third parameter, and determining, based on one, some, or all the measured path losses, the transmission power for the sidelink beam- formed resource to the second UE and/or a sidelink beam-formed resource to the third UE.
  • the method further comprises determining, based on the one, some, or all the measured path losses, a transmission power for an uplink beam formed resource to the PCCD.
  • the sidelink beam-formed resource to the second UE is associated with a spatial direction for transmission
  • the sidelink beam-formed resource to the third UE is associated with a further spatial direction for transmission.
  • the sidelink beam-formed resource to the second UE is associated with a spatial direction for transmission, and the sidelink beam- formed resource to the third UE associated with a further spatial direction for transmission is decreased, in particular such that the sidelink beam-formed resource has lower transmission power than the sidelink beam-formed resource to the second UE.
  • the method further comprises determining the transmission power based on predetermined weighting factors respectively applied to the second path loss and the third path loss.
  • the method further comprises determining the transmission power based on a predetermined collective function applied to the second path loss and the third path loss.
  • the predetermined collective function comprises a mean, a median, a minimum, a maximum, a sum, or a weighted sum of the second path loss and the third path loss.
  • the method further comprises determining the transmission power for transmission on a Physical Sidelink Shared Channel, PS-SCH, Physical Sidelink Control Channel, PS-CCH, and/or Physical Sidelink Sounding Reference, PS-SRS.
  • the preconfigured determination scheme is an open-loop scheme based only on path loss measurements, or the preconfigured determination scheme is a closed-loop scheme based on path loss measurements and one or more power control commands received by the UE, particularly from the PCCD.
  • FIG. 1A shows a wireless communication device and a (e.g. network) device according to embodiments of the invention.
  • FIG IB shows a schematic view of a device according to another embodiment of the present invention.
  • FIG. 2 shows a wireless communication device and a network device according to embodiments of the invention.
  • FIG. 3 shows a wireless communication device and a network device according to embodiments of the invention.
  • FIG. 4 shows a wireless communication device and a network device according to embodiments of the invention.
  • FIG. 5 shows a transmission power control method according to an embodiment of the invention.
  • FIG. 1A shows a wireless communication device (UE) 100 configured to perform beam- selective transmission power control, according to an embodiment of the invention. Further, FIG. 1A also shows a device 101 for supporting the beam-selective transmission power control performed by the UE 100, according to another embodiment of the invention.
  • the device 101 may be - as assumed exemplarily in the following description of embodiments - a PCCD which could be a network device, (i.e. a TRP etc.). However, the device 101 could also be another UE or any other entity supporting the power control according to the features described below.
  • the UE 100 is configured to receive, particularly from the device/ PCCD 101, a first parameter 102 of a downlink beam-formed resource from the PCCD 101 to the UE 100, and a second parameter 103 of a sidelink beam- formed resource from a second UE 104 to the UE 100. Accordingly, the device 101 is configured to transmit, particularly to the UE 100, the first parameter 102 of the downlink beam- formed resource from the device 101 to the UE 100, and the second parameter 103 of the sidelink beam-formed resource from a second UE 104 to the UE 100.
  • the UE 100 may communicate with the second UE 104 via a sidelink as indicated by the dashed line.
  • the UE 100 may communicate with the device/ PCCD 101 via downlink/uplink (or another sidelink if the device 101 is another UE) as indicated by the dashed line.
  • the UE 100 is further configured to measure a first path loss 105 based on the first received parameter 102, and to measure a second path loss 106 based on the second received parameter 103.
  • the path loss measurements 105, 106 may be carried out by the UE 100 in a conventional manner, i.e. as known from the prior art.
  • the UE 100 is configured to determine, based on the first and second path losses 105, 106, and according to a preconfigured determination scheme 107, a transmission power 108 for a sidelink beam- formed resource to the second UE 104.
  • the preconfigured determination scheme 107 may be at least one algorithm or formula, which is preinstalled at the UE 100.
  • the UE 100 may be able to choose an algorithms or formula from multiple algorithms or formulas preconfigured at the UE 100, e.g. depending on the type of links, for which the pass losses were measured, or according to different embodiments of the invention as described below.
  • a transmission power control for the 5G NR beam-based sidelink is considered for three different types of signal, namely: Physical Sidelink Shared Channel (PS-SCH), Physical Sidelink Control Channel (PS-CCH), Physical Sidelink Sounding Reference (PS-SRS).
  • PS-SCH Physical Sidelink Shared Channel
  • PS-CCH Physical Sidelink Control Channel
  • PS-SRS Physical Sidelink Sounding Reference
  • an example beam-based sidelink power control equation is proposed (i.e. as the preconfigured determination scheme 107) in the following (based on modified versions of 5G NR uplink beam based equations).
  • these equations 107 determine how the measured path losses 105, 106 from the different beam-formed resources, i.e. from the device 101 and from one or different sidelink resources, can be combined and weighted in different ways, in order to implement the beam-based sidelink transmission power control to the second UE 104.
  • Fig. IB shows a schematic view of a user device according to another embodiment of the present invention.
  • different beamforming at the device may correspond to different beam directions.
  • Different beamformings may be achieved from a single beam- forming array, a panel or antenna element on the device.
  • beamformings may be achieved using one or more beam- forming arrays, panels or antenna elements on different locations of the device.
  • each beam- forming array, panel or antenna element on the device could also form a single fixed beam (direction).
  • a panel may be defined as a set of co-located antenna elements.
  • Fig. IB show an example of three possible scenarios in which the UE is a vehicle.
  • different beam directions are formed using a single beam-forming array, a panel or an antenna element located at a single position.
  • different beam directions are formed using multiple beam-forming arrays, panels or antenna elements, which are at different locations on the vehicle.
  • 203 a scenario is illustrated, in which fixed beams are formed using multiple beam-forming arrays, panels or antenna elements at different locations of the vehicle.
  • FIG. IB illustrates the different scenarios with reference to a car
  • this is only one possible example of a UE and the spatial filters described above may also be embodied in different types of UEs, such as for instance a mobile phone or any vehicle.
  • FIG. 2 shows a UE 100 and a device 101 according to embodiments of the invention, which build on the UE 100 and device 101 shown in FIG. 1A .
  • the device 101 provides the parameters 102/103 to the UE 100, and the UE 100 determines the transmission power 108 for the side link beam- formed resource to the second UE 104.
  • the device 101 may again be a PCCD, like a TRP.
  • FIG. 2 shows in particular the basic concept of the beam-based transmission power control scheme performed by the UE 100.
  • the UE 100 of which the transmission power 108 is to be power controlled at least for sidelink beam- formed resource to the second UE (104), but optionally also for the uplink beam formed resource to the device 101, is informed about the parameter 102 of the downlink beam- formed resource from the device 101 (c/d) and about the parameter 103 of the sidelink beam- formed resource from the second UE 104 (c/s).
  • These parameters 102 and 103 are at least taken into account for the path loss measurements 105 and 106.
  • the parameter 102 may refer to a resource from Channel State Information-Reference Signal (CSI-RS) signal or a Synchronization Signal Block (SSB) signal transmitted by the base station (Uu link).
  • the parameter 103 may be a sidelink CSI- RS or sidelink SSB resource.
  • the downlink beam- formed resource from the device 101 (here a Uu downlink from a base station) corresponds to an unwanted spatial transmission direction, while the sidelink beam- formed resource to the second UE 104 corresponds to a wanted spatial transmission direction.
  • the UE 100 and second UE 104 may be installed at vehicles, here cars A and B.
  • the standard power control equation for the 5G NR physical uplink shared channel (PU-SCH) - see‘3 GPP TS 38.213 V15.1.0 (2018-03), Section 7, Uplink Power Control’ - is modified, in particular for the sidelink with the additional parameters and resources needed for the sidelink to use it for the 5G NR PS-SCH.
  • equation (1) shows a baseline modification.
  • the relevant modifications and changes are shown in grey shading in equation (1).
  • Other modifications not highlighted include changing the subscripts to pssch.
  • the path loss measurements inside the min (.) expression includes the path loss measurements 105, 106 for the side link PLf c (q s ) to the second UE 104 and its own weighting factor alpha a/. c j) .
  • the equation (1) is a beam-based equation, which means the transmission power for the spatial directions, for which the UE 100 receives the indicated resources (q i and q s ) are the ones which are power controlled according to the equation (1). By including both the sidelink beam-formed resource and the downlink beam-formed resource, the transmission in both of these directions may be controlled.
  • FIG. 3 shows a UE 100 and device 101 according to embodiments of the invention, which build on the UE 100 and device 101 shown in FIG. 1A and FIG. 2. Same elements in FIG. 1A, FIG. 2 and FIG. 3 are labelled with the same reference signs and function likewise. That is, also in FIG. 3, the device 101 provides the parameters 102/103 to the UE 100, and the UE 100 determines the transmission power 108 for at least the sidelink beam- formed resource to the second UE 104.
  • the UE 100 may particularly receive a third parameter 301 ofa sidelink beam- formed resource from at least one third UE 300 to the UE 100.
  • the UE 100 may measure a third path loss based on the third parameter 301, and may determine, based on one, some, or all the measured path losses, the transmission power 108 for the sidelink beam- formed resource to the second UE 104 and/or a sidelink beam- formed resource to the third UE 300.
  • the sidelink beam-formed resource to the third UE 300 is thereby associated with a further spatial direction for transmission.
  • the sidelink beam- formed resource from the third UE 300 relates to a wanted direction of transmission.
  • This situation may be reflected by a first modification of the above equation (1), namely to include the possibility that there are n multiple sidelink resources ⁇ q si to q sn ) to serve.
  • This may advantageously be used for sidelink multicasting / groupcasting, or to manage wanted or unwanted transmissions in different sidelink directions.
  • the changes for this first modification are shown in the equation (2) below:
  • the UE 100 may also determine the transmission power 108 based on predetermined target transmission powers predefined for the zero path losses for at least the downlink beam- formed resource from the device 101 to the UE 100 and the sidelink beam- formed resource from the second UE 104 to the UE 100 respectively.
  • the sidelink and downlink beam formed resources in the min (.) part of the equation may have different target transmission powers Po (for zero path loss) as specifically illustrated in the equation below as P 0 d, P sssch,fc and P 0 s, P sssch,fc respectively.
  • the target power which is sent in each of these spatial directions, can be controlled. This is particularly useful, if one of the spatial directions is an unwanted direction - as illustrated in FIG. 3 with respect to the further UE 300. This is shown below in equation (3):
  • the UE 100 may also be configured to determine the transmission power 108 based on one or more predetermined weighting factors, respectively applied to the first path loss 105 and/or to the second path loss 106.
  • FIG. 4 shows a UE 100 and device 101 according to embodiments of the invention, which build on the UE 100 and device 101 shown in FIG. 1A, 2 and 3. Same elements in FIG. 1A -4 are labelled with the same reference signs and function likewise. That is, also in FIG. 4, the device 101 provides the parameters 102/103 to the UE 100, and the UE 100 determines the transmission power 108 for the sidelink beam- formed resource to the second UE 104.
  • the UE 100 shown in FIG. 4 may receive a third parameter 301 of a sidelink beam-formed resource from at least one third UE 300 to the UE 100.
  • the sidelink beam- formed resource to the third UE 300 is associated with a further spatial direction for transmission.
  • the sidelink beam- formed resource from the third UE 300 relates in FIG. 4 to an unwanted direction of transmission.
  • the UE 100 may also determine the transmission power 108 based on a predetermined collective function applied to the second path loss 106 and the third path loss. This may be reflected by a fourth modification of equation (1), wherein a set of sidelink beam- formed resources could be bundled together in the collective function f (.) in the min (.) part of the equation (1). This may be useful for multicasting or groupcasting, wherein beams to multiple receiving UEs may have to be formed simultaneously, and the performance for the best or worse set of those multiple receiving UEs in the group should be optimized.
  • the collective function f (.) can be many different types of expressions, which could include: Mean (.), Minimum (.), Max (.), Sum (.), Median (.), Weighted sum (.), etc.
  • PS-SCH open-loop Above under a), the proposal for the closed-loop power control of the PS-SCH was described.
  • a baseline modification is proposed of the 5G NR beam based power control for the physical uplink shared channel (PUSCH).
  • the baseline modifications is shown in the equation (6) below (grey shaded again the relevant modifications):
  • the preconfigured determination scheme 107 may be a closed- loop scheme based on path loss measurements and one or more power control commands received by the UE 100, particularly from the PCCD 101.
  • the baseline modification described above for the open-loop power equation (6) all of the first to fourth modifications described for the PS-SCH closed-loop equation can be applied as well.
  • the present 3 GPP 5G NR uplink power control equations was used as a basis, and was modified for different signal types to illustrate the key points.
  • these equations are for systems, in which the control (CCH) and shared channel (SCH) (data parts) are time domain multiplexed (TDM). Therefore, the power control and the bandwidth can be easily separated for these separate parts.
  • TDM time domain multiplexed
  • the control and data parts may be multiplexed in the frequency domain.
  • the bandwidth part of the equations may also include both the parts from the control and data parts.
  • the bandwidth part may change in equation (1) from:
  • FIG. 5 shows a method 500 according to an embodiment of the invention.
  • the method 500 is for performing beam-selective transmission power control at a UE 100.
  • the method 500 may particularly be carried out by the UE 100 of FIG. 1A-4.
  • the method includes: a step 501 of receiving, particularly from a TRP 101 a first parameter 102 of a downlink beam- formed resource from the TRP 101 to the UE 100 and a second parameter 103 of a sidelink beam-formed resource from a second UE 104 to the UE 100; a step 502 of measuring a first path loss 105 based on the first parameter 102 and a second path loss 106 based on the second parameter 103; and a step 503 of determining, based on the first and second path losses 105, 106, and according to a preconfigured determination scheme 107, a transmission power 108 for a sidelink beam- formed resource from the UE 100 to the second UE 104.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne la commande de puissance de transmission au niveau d'un dispositif de communication sans fil (UE). En particulier, l'invention concerne un UE permettant d'effectuer une commande de puissance de transmission sélective par faisceau, et un dispositif, par exemple un dispositif de réseau, permettant de prendre en charge une commande de puissance de transmission sélective par faisceau. L'UE est configuré pour recevoir un premier paramètre d'une ressource formée par un faisceau de liaison descendante du dispositif à l'UE et un second paramètre d'une ressource formée par un faisceau de liaison latérale d'un second UE à l'UE. En outre, il est configuré pour mesurer une première perte de trajet sur la base du premier paramètre et une seconde perte de trajet sur la base du second paramètre, et pour déterminer, sur la base des première et seconde pertes de trajet et selon un schéma de détermination préconfiguré, une puissance de transmission pour une ressource formée par un faisceau de liaison latérale au second UE. Le dispositif est configuré par conséquent pour transmettre un premier paramètre d'une ressource formée par un faisceau de liaison descendante du dispositif à l'UE et un second paramètre d'une ressource formée par un faisceau de liaison latérale d'un second UE à l'UE.
PCT/EP2019/060792 2018-12-21 2019-04-26 Schéma de commande de puissance de transmission sélective par faisceau WO2020126114A1 (fr)

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CN201980085860.0A CN113228530B (zh) 2018-12-21 2019-04-26 波束选择性发射功率控制方案

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CN113228530B (zh) 2022-09-16

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