WO2020164027A1 - Beam selection of multi-trp - Google Patents

Beam selection of multi-trp Download PDF

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Publication number
WO2020164027A1
WO2020164027A1 PCT/CN2019/074996 CN2019074996W WO2020164027A1 WO 2020164027 A1 WO2020164027 A1 WO 2020164027A1 CN 2019074996 W CN2019074996 W CN 2019074996W WO 2020164027 A1 WO2020164027 A1 WO 2020164027A1
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WO
WIPO (PCT)
Prior art keywords
network device
candidate beams
target
terminal device
combined
Prior art date
Application number
PCT/CN2019/074996
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English (en)
French (fr)
Inventor
Zhihang Li
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
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 Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to CN201980091925.2A priority Critical patent/CN113424584B/zh
Priority to PCT/CN2019/074996 priority patent/WO2020164027A1/en
Publication of WO2020164027A1 publication Critical patent/WO2020164027A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to the beam selection of multi-transmission point (TRP) .
  • TRP multi-transmission point
  • new radio (NR) system adopts larger bandwidth and higher frequency band than long term evolution advanced (LTE-A) system.
  • LTE-A long term evolution advanced
  • the coverage and throughput of NR system may not be guaranteed with omnidirectional antennas due to hostile propagation qualities, including large path loss, atmospheric and rain absorptions, low diffraction around obstacles and penetration through objects on high frequency band. Therefore, the NR system uses directional antennas and big antenna arrays to produce narrow beams with high beamforming gains.
  • NR can provide seamless access to UEs located at anywhere in a TRP. Sicne the high beamforming gain beams are narrow, the transmission beam pair link (BPL) of UE and TRP must be aligned.
  • BPL transmission beam pair link
  • example embodiments of the present disclosure provide a solution for beam selection of multi-transmission point (TRP) .
  • TRP multi-transmission point
  • a method for beam selection ofmulti-TRP comprises determining, at a terminal device, beam qualities of a first set of candidate beams received from a primary network device and a second set of candidate beams received from a secondary network device; determining, based on the beam qualities, a target combined beam indicating a first target bean from the first set of candidate beams and a second target beam from the second set of candidate beans; generating an indication indicating an identity of the first target beam, an identity of the second target beam and an identity of the terminal device; and transmitting the indication to the primary network device.
  • a method for beam selection of multi-TRP comprises receiving, at a primary network device, an indication indicating an identity of the first target beam, an identity of the second target beam and an identity of the terminal device from a terminal device, the first target beam from a first set of candidate beams and the second target beam from a second set of candidate beams are indicated by a target combined beam determined by the terminal device based on the beam qualities of the first set of candidate beams received from the primary network device and the second set of candidate beams received from a secondary network device; and transmitting the indication to the secondary network device.
  • a method for beam selection of multi-TRP comprises receiving, at a secondary network device, an indication indicating an identity of the first target beam, an identity of the second target beam and an identity of a terminal device from the primary network device, the first target beam from a first set of candidate beams and the second target beam from a second set of candidate beams are indicated by a target combined beam determined by the terminal device based on the beam qualities of the first set of candidate beams received from the primary network device and a second set of candidate beams received from the secondary network device.
  • a method for beam selection of multi-TRP comprises determining, at a primary network device, beam qualities of a first set of candidate beams received from a terminal device and a second set of candidate beams received from a secondary network device; determining, based on the beam qualities, a target combined beam indicating a first target beam from the first set of candidate beams and a second target beam from the second set of candidate beams; generating a first indication indicating an identity of the first target beam and a second indication indicating an identity of the second target beam and an identity of the terminal device; and transmitting the first indication to the terminal device and the second indication to the secondary network device.
  • a method for beam selection of multi-TRP comprises receiving, at a terminal device, a first indication indicating an identity of the first target beam from the primary network device, the first target beam from a first set of candidate beams and a second target beam from a second set of candidate beams are indicated by a target combined beam determined by the primary network device based on the beam qualities of the first set of candidate beams received from the terminal device and the second set of candidate beams received from a secondary network device.
  • a method for beam selection of multi-TRP comprises receiving, at a secondary network device, a second indication indicating an identity of the second target beam and an identity of a terminal device from the primary network device, a first target beam from a first set of candidate beams and the second target beam from a second set of candidate beams are indicated by a target combined beam determined by the primary network device based on the beam qualities of the first set of candidate beams received from the terminal device and the second set of candidate beams received from a secondary network device.
  • a device for beam selection of multi-TRP comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the device at least to perform the method according to the first aspect.
  • a device for beam selection of multi-TRP comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the device at least to perform the method according to the second aspect.
  • a device for beam selection ofmulti-TRP comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the device at least to perform the method according to the third aspect.
  • a device for beam selection ofmulti-TRP comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the device at least to perform the method according to the fourth aspect.
  • a device for beam selection ofmulti-TRP comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the device at least to perform the method according to the fifth aspect.
  • a device for beam selection of multi-TRP comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the device at least to perform the method according to the sixth aspect.
  • an apparatus comprising means to perform the steps of the method according to the first aspect.
  • an apparatus comprising means to perform the steps of the method according to the second aspect.
  • an apparatus comprising means to perform the steps of the method according to the third aspect.
  • an apparatus comprising means to perform the steps of the method according to the fourth aspect.
  • an apparatus comprising means to perform the steps of the method according to the fifth aspect.
  • an apparatus comprising means to perform the steps of the method according to the sixth aspect.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the first aspect.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the second aspect.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the third aspect.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the fourth aspect.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the fifth aspect.
  • a computer readable medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to carry out the method according to the sixth aspect.
  • FIG. 1 shows an example communication network 100 in which example embodiments of the present disclosure can be implemented
  • FIG. 2 shows a diagram of an example process 200 for beam selection of multi-TRP according to some example embodiments of the present disclosure
  • FIG. 3 shows a diagram of an example process 300 for beam selection of multi-TRP according to some example embodiments of the present disclosure
  • FIG. 4 shows a flowchart of an example method 400 for beam selection of multi-TRP according to some embodiments of the present disclosure
  • FIG. 5 shows a flowchart of an example method 500 for beam selection of multi-TRP according to some embodiments of the present disclosure
  • FIG. 6 shows a flowchart of an example method 600 for beam selection of multi-TRP according to some embodiments of the present disclosure
  • FIG. 7 shows a flowchart of an example method 700 for beam selection of multi-TRP according to some embodiments of the present disclosure
  • FIG. 8 shows a flowchart of an example method 800 for beam selection of multi-TRP according to some embodiments of the present disclosure
  • FIG. 9 shows a flowchart of an example method 900 for beam selection of multi-TRP according to some embodiments of the present disclosure
  • FIG. 10 is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • Fig. 11 illustrates a diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
  • the term “communication network” refers to a network that follows any suitable communication standards or protocols such as long term evolution (LTE) , LTE-Advanced (LTE-A) and 5G NR, and employs any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO) , OFDM, time division multiplexing (TDM) , frequency division multiplexing (FDM) , code division multiplexing (CDM) , Bluetooth, ZigBee, machine type communication (MTC) , eMBB, mMTC and uRLLC technologies.
  • LTE network, the LTE-Anetwork, the 5G NR network or any combination thereof is taken as an example of the communication network.
  • the term “network device” refers to any suitable device at a network side of a communication network.
  • the network device may include any suitable device in an access network of the communication network, for example, including a base station (BS) , a relay, an access point (AP) , a transmission point (TRP) , a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a 5G or next generation NodeB (gNB) , a Remote Radio Module (RRU) , a radio header (RH) , a remote radio head (RRH) , a low power node such as a femto, a pico, and the like.
  • the eNB is taken as an example of the network device.
  • the network device may also include any suitable device in a core network, for example, including multi-standard radio (MSR) radio equipment such as MSR BSs, network controllers such as radio network controllers (RNCs) or base station controllers (BSCs) , Multi-cell/multicast Coordination Entities (MCEs) , Mobile Switching Centers (MSCs) and MMEs, Operation and Management (O&M) nodes, Operation Support System (OSS) nodes, Self-Organization Network (SON) nodes, positioning nodes, such as Enhanced Serving Mobile Position Centers (E-SMLCs) , and/or Mobile Data Terminals (MDTs) .
  • MSR multi-standard radio
  • RNCs radio network controllers
  • BSCs base station controllers
  • MCEs Multi-cell/multicast Coordination Entities
  • MSCs Mobile Switching Centers
  • OFM Operation and Management
  • OSS Operation Support System
  • SON Self-Organization Network
  • positioning nodes such as Enhanced Serving Mobile Position Centers
  • the term “terminal device” refers to a device capable of, configured for, arranged for, and/or operable for communications with a network device or a further terminal device in a communication network.
  • the communications may involve transmitting and/or receiving wireless signals using electromagnetic signals, radio waves, infrared signals, and/or other types of signals suitable for conveying information over air.
  • the terminal device may be configured to transmit and/or receive information without direct human interaction. For example, the terminal device may transmit information to the network device on predetermined schedules, when triggered by an internal or external event, or in response to requests from the network side.
  • terminal device examples include, but are not limited to, user equipment (UE) such as smart phones, wireless-enabled tablet computers, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , and/or wireless customer-premises equipment (CPE) .
  • UE user equipment
  • LME laptop-embedded equipment
  • CPE wireless customer-premises equipment
  • the term “cell” refers to an area covered by radio signals transmitted by a network device.
  • the terminal device within the cell may be served by the network device and access the communication network via the network device.
  • circuitry may refer to one or more or all of the following:
  • combinations of hardware circuits and software such as (as applicable) : (i) a combination of analog and/or digital hardware circuit (s) with software/firmware and (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • FIG. 1 illustrates a communication network 100 in which embodiments of the present disclosure can be implemented.
  • the communication network 100 comprises network devices 120-1 and 120-2 (hereafter also referred to as network 120) and a terminal device 110. It is to be understood that the communication system 100 may include any suitable number of terminal devices. It should be noted that the communication system 100 may also include other elements which are omitted for the purpose of clarity.
  • the network devices 120-1 and 120-2 may communicate with the terminal device 110.
  • the network devices 120-1 and 120-2 may communicate with each other. It is to be understood that the number of network devices and terminal devices shown in FIG. 1 is given for the purpose of illustration without suggesting any limitations.
  • the communication network 100 may include any suitable number of network devices and terminal devices.
  • the network device 120-1 may be referred to a primary network device (hereafter also referred to as primary serving TRP, PST) and the network device 120-2 may be referred to a secondary network device (hereafter also referred to as secondary serving TRP, SST) .
  • primary serving TRP primary serving TRP
  • secondary serving TRP secondary serving TRP
  • a beam selection of single TRP scenario has been well discussed.
  • the terminal device 110 and its serving TRP can utilize some conventional procedures to select a suitable beam pair link (BPL) .
  • BPL beam pair link
  • a “BPL” may be used for a downlink (DL) and uplink (UL) control/data channel transmission between a network device and a terminal device.
  • the BPL between the terminal device 110 and the network device 120-1 may be beams 121 and 112. It can also be determined that the BPLbetween the terminal device 110 and the network device 120-2 may be beams 131 and 113. However, in a multiple TRPs scenario, whether the terminal device 110 selects the beam 112 or 113, it will not align with the beam of PST or the beam of SST.
  • the embodiments of the present disclosure proposed some approaches for beam selection in a multiple TRPs scenario.
  • the terminal device 110 may determine a combined beam combined from a corresponding beam associated with the network device 120-1 and a corresponding beam associated with the network device 120-2 based on a downlink reference signal from the network device 120-1 and the network device 120-2 respectively.
  • the determined combined beam may be used for forming a BPL with a suitable beam of the terminal device 110.
  • the network device 120-1 may determine a combined beam combined from a corresponding beam associated with the terminal device 110 and a corresponding beam associated with the network device 120-2 based on an uplink reference signal from the terminal device 110 and the backhaul from the network device 120-2, respectively.
  • FIGs. 2-3 shows processes 200 and 300 according to example embodiments of the present disclosure.
  • the processes 200 and 300 will be described with reference to FIG. 1.
  • the processes 200 and 300 may involve beam selection of multi-TRP.
  • the terminal device 110 may determine a target combined beam based on the downlink reference signal from the network device 120-1 and the network device 120-2 respectively.
  • the network device 120-1 and the network device 120-2 may transmit a same reference signal to the terminal device 110.
  • the network device 120-1 and the network device 120-2 may transmit different reference signals to the terminal device 110.
  • the embodiments of the process 200 will be described in detail as below.
  • the network device 120-1 may transmit 210 a first reference signal (RS) to the terminal device 110 and the network device 120-2 may transmit a second RS to the terminal device 110.
  • the first and the second RS herein may be referred to the downlink reference signal between the network device 120 and the terminal device 110, for example, a channel state information reference signal (CSI-RS) .
  • CSI-RS channel state information reference signal
  • the first RS transmitted from the network device 120-1 and the second RS transmitted from the network device 120-2 may be same as each other. That is, the network device 120-1 and 120-2 may transmit a combined beam coordinately at a time and traverse all combined beams in several time periods by beam sweeping.
  • the terminal device 110 may receive the first RS on the plurality of combined beams, which may be considered as a first set of candidate beams and receive the second RS on the plurality of combined beams, which may be considered as a second set of candidate beams.
  • the plurality of combined beams included in the first set of candidate beams may be combined from the beam group transmitted from the network device 120-1 and the plurality of combined beams included in the second set of candidate beams may be combined from the beam group transmitted from the network device 120-2.
  • the network device 120-1 may transmit 205 the information to the network device 120-2 through a backhaul before the network device 120-1 transmits the RS to the terminal device 110.
  • the information may indicate the first RS of the network device 120-1 and a beam pattern.
  • the terminal device 110 may determine the beam qualities of the first set of candidate beams and the second set of candidate beams and determine 220 a target combined beam based on the beam qualities. For example, the terminal device 110 may measure the beam qualities of the first set of candidate beams and the second set of candidate beams and determine the target combined beam based on the results of the beam quality measurements. The beam quality of the target combined beam may, for example, exceed a threshold quality. The target combined beam may indicate a first target beam from the first set of candidate beams and a second target beam from the second set of candidate beams.
  • the first RS transmitted from the network device 120-1 and the second RS transmitted from the network device 120-2 may be different from each other. That is, the network device 120-1 and 120-2 may transmit beams individually at a time, and only need traverse all their own beams in several time periods by beam sweeping.
  • the terminal device 110 may receive the first RS on the first beam group of the network device 120-1, which may be considered as a first set of candidate beams and receive the second RS on the second beam group of the network device 120-2, which may be considered as a second set of candidate beams.
  • the terminal device 110 may determine the beam qualities of the first set of candidate beams and the second set of candidate beams and determine 220 a target combined beam based on the beam qualities. For example, the terminal device 110 may determine a plurality of the combined beams by combining the first set of candidate beams with the second set of candidate beams and measure the beam qualities of the plurality of the combined beams. The terminal device 110 may further determine the target combined beam based on the results of the beam quality measurements. The beam quality of the target combined beam may, for example, exceed a threshold quality.
  • the target combined beam may indicate a first target beam from the first set of candidate beams and a second target beam from the second set of candidate beams.
  • the terminal device 110 then may generate an indication indicating an identity of the first target beam, an identity of the second target beam and an identity of the terminal device 110 and transmit 225 the indication to the network device 120-1.
  • the network device 120-1 may forward 230 the indication to the network device 120-2.
  • the network device 120-1 may inform 230 the identity of a beam of the terminal device 110, which is corresponding to the first target beam and the second target beam.
  • the network device 120-1 may transmit 240 a first RS on the first target beam and the network device 120-2 may transmit 245 a second RS on the second target beam.
  • the latency will be shorten due to it only needs the terminal device to traverse all possible Tx beams, rather than the PST and SST traverse all TRP Tx beams jointly.
  • the transmission delay may only rely on the beam sweeping time periods of the terminal device and will not increase with the increase of TRP number.
  • the network device 120-1 may also determine a combined beam combined from a corresponding beam associated with the terminal device 110 and a corresponding beam associated with the network device 120-2 based on an uplink reference signal from the terminal device 110 and the backhaul from the network device 120-2, respectively.
  • the embodiments of the process 300 will be described in detail as below.
  • the terminal device 10 may transmit 310 a RS to the network device 120-1 and transmit 315 the RS to the network device 120-1.
  • the network device 120-1 may firstly inform 305 the network device 120-2 through backhaul that the terminal device assigned to the network device 120-1 needs to be measured by the network device 120-1.
  • the RS herein may be referred to the uplink reference signal between the network device 120 and the terminal device 110, for example, a sounding reference signal (SRS) .
  • SRS sounding reference signal
  • the network device 120-2 may receive the RS on the beam group of the terminal device, which may be considered as a first set of the candidate beams.
  • the network device 120-2 may measure the uplink channel between the terminal device 110 and the network device 120-2 based on the RS, and generate the feedback information.
  • the feedback information may, for example, comprise the identities of the first set of the candidate beams, the identities of the beam group of network device 120-2, which may be considered as the second set of the candidate beams, the identities of the terminal device and a channel between the terminal device and the secondary network device.
  • the network device 120-2 may transmit 320 the feedback information to the network device 120-1.
  • the network device 120-1 may receive the RS on the beam group of the terminal device, which may be considered as a first set of the candidate beams and determine the beam qualities of the first set of candidate beams and the second set of candidate beams and determine 325 a target combined beam based on the beam qualities.
  • the terminal device 110 may determine a plurality of the combined beams by combining the first set of candidate beams with the second set of candidate beams and measure the beam qualities of the plurality of the combined beams.
  • the network device 120-1 may further determine the target combined beam based on the results of the beam quality measurements.
  • the beam quality of the target combined beam may, for example, exceed a threshold quality.
  • the target combined beam may indicate a first target beam from the first set of candidate beams and a second target beam from the second set of candidate beams.
  • the network device 120-1 may generate a first indication indicating an identity of the first target beam and a second indication indicating an identity of the second target beam and an identity of the terminal device.
  • the network device 120-1 may transmit 330 the second indication to the network device 120-2 and transmit 335 the first indication to the terminal device 110.
  • the network device 120-1 may transmit 340 a RS on the first target beam and the network device 120-2 may transmit 345 a RS on the second target beam.
  • FIG. 4 shows a flowchart of an example method 400 for beam selection of multi-TRP according to some example embodiments of the present disclosure.
  • the method 400 can be implemented at the terminal device 110 as shown in FIG. 1. For the purpose of discussion, the method 400 will be described with reference to FIG. 1.
  • the terminal device 110 determines beam qualities of a first set of candidate beams received from a network device 120-1 and a second set of candidate beams received from a network device 120-2.
  • the terminal device 110 may receive a first reference signal, RS from the network device 120-1 on the first set of candidate beams and a second DL RS from the network device 120-2 on the second set of candidate beams, the first RS being same as a second RS; and perfonn beam quality measurements for a plurality of combined beams based on the first and the second RSs, the first or the second sets of the candidate beams comprising the plurality of combined beams combined from a first beam group transmitted from the network device 120-1 and a second beam group transmitted from the network device 120-2.
  • the terminal device 110 may receive a first reference signal, RS from the network device 120-1 and a second RS from the network device 120-2, the first RS being different from a second RS; and perform beam quality measurements for a plurality of combined beams based on the first and the second RSs, the first set of the candidate beams comprising a first beam group transmitted from the network device 120-1 and a second set of the candidate beams comprising a second beam group transmitted from the network device 120-2, the plurality of combined beams being combined from the first beam group and the second beam group.
  • the terminal device 110 determines, based on the beam qualities, a target combined beam indicating a first target beam from the first set of candidate beams and a second target beam from the second set of candidate beams.
  • the terminal device 110 may determine the target combined beam from a plurality of combined beams based on results of the beam quality measurements.
  • the terminal device 110 generates an indication indicating an identity of the first target beam, an identity of the second target beam and an identity of the terminal device.
  • the terminal device 110 transmits the indication to the network device 120-1.
  • FIG. 5 shows a flowchart of an example method 500 for beam selection of multi-TRP according to some example embodiments of the present disclosure.
  • the method 500 can be implemented at the network device 120-1 as shown in FIG. 1. For the purpose of discussion, the method 500 will be described with reference to FIG. 1.
  • the network device 120-1 receives an indication indicating an identity of the first target beam, an identity of the second target beam and an identity of the terminal device from a terminal device, the first target beam from a first set of candidate beams and the second target beam from a second set of candidate beams are indicated by a target combined beam determined by the terminal device based on the beam qualities of the first set of candidate beams received from the network device 120-1 and the second set of candidate beams received from a network device 120-2.
  • the network device 120-1 transmits the indication to the network device 120-2.
  • the network device 120-1 may transmit, to the terminal device, a first reference signal, RS to enable the terminal device to perform beam quality measurements for a plurality of combined beams based on the first RS, the first or the second sets of the candidate beams comprising the plurality of combined beams combined from a first beam group transmitted from the network device 120-1 and a second beam group transmitted from the network device 120-2, the first RS being same as a second RS transmitted from the network device 120-2 to the terminal device.
  • a first reference signal, RS to enable the terminal device to perform beam quality measurements for a plurality of combined beams based on the first RS, the first or the second sets of the candidate beams comprising the plurality of combined beams combined from a first beam group transmitted from the network device 120-1 and a second beam group transmitted from the network device 120-2, the first RS being same as a second RS transmitted from the network device 120-2 to the terminal device.
  • the network device 120-1 may transmit, to the network device 120-2, information associated with the first RS and a beam pattern associated with the first set of the candidate beams.
  • the network device 120-1 may transmit a first reference signal, RS to the terminal device, to enable the terminal device to perform beam quality measurements for a plurality of combined beams based on the first RS, the first set of the candidate beams comprising a first beam gro. up transmitted from the network device 120-1 and a second set of the candidate beams comprising a second beam group transmitted from the network device 120-2, the plurality of combined beams being combined from the first beam group and the second beam group, the first RS being different from a second RS transmitted from the network device 120-2 to the terminal device.
  • RS reference signal
  • FIG. 6 shows a flowchart of an example method 600 for beam selection of multi-TRP according to some example embodiments of the present disclosure.
  • the method 600 can be implemented at the network device 120-2 as shown in FIG. 1. For the purpose of discussion, the method 600 will be described with reference to FIG. 1.
  • the network device 120-2 receives an indication indicating an identity of the first target beam, an identity of the second target beam and an identity of a terminal device from the network device 120-1, the first target beam from a first set of candidate beams and the second target beam from a second set of candidate beams are indicated by a target combined beam determined by the terminal device based on the beam qualities of the first set of candidate beams received from the network device 120-1 and a second set of candidate beams received from the network device 120-2.
  • the network device 120-2 may transmit a second reference signal, RS to the terminal device, to enable the terminal device to perform beam quality measurements for a plurality of combined beams based on the second RS, the first or the second sets of the candidate beams comprising the plurality of combined beams combined from a first beam group transmitted from the network device 120-1 and a second beam group transmitted from the network device 120-2, the second RS being same as a first RS transmitted from the network device 120-1 to the terminal device.
  • RS second reference signal
  • the network device 120-2 may receive, from the network device 120-1, information associated with the first RS and a beam pattern associated with the first set of the candidate beams. The network device 120-2 may further transmit the second RS based on the received information and beam pattern.
  • the network device 120-2 may transmit a second reference signal, RS to the terminal device, to enable the terminal device to perform beam quality measurements for a plurality of combined beams based on the second RS, the first set of the candidate beams comprising a first beam group transmitted from the network device 120-1 and a second set of the candidate beams comprising a second beam group transmitted from the network device 120-2, the plurality of combined beams being combined from the first beam group and the second beam group, the second RS being different from a first RS transmitted from the network device 120-1 to the terminal device.
  • RS second reference signal
  • FIG. 7 shows a flowchart of an example method 700 for beam selection of multi-TRP according to some example embodiments of the present disclosure.
  • the method 700 can be implemented at the network device 120-1 as shown in FIG. 1. For the purpose of discussion, the method 700 will be described with reference to FIG. 1.
  • the network device 120-1 determines beam qualities of a first set of candidate beams received from a terminal device and a second set of candidate beams received from a network device 120-2.
  • the network device 120-1 may receive a reference signal, RS from the terminal device on the first set of candidate beams and feedback information from the network device 120-2 on the second set of candidate beams, the feedback information indicating the first set of the candidate beams, the second set of candidate beams and a channel between the terminal device and the network device 120-2; and perform beam quality measurements for a plurality of combined beams based on the reference signal and the feedback information, the first set of the candidate beams comprising a first beam group transmitted from the terminal device and a second set of the candidate beams comprising a second beam group transmitted from the network device 120-2, the plurality of combined beams being combined from the first beam group and the second beam group.
  • the network device 120-1 determines, based on the beam qualities, a target combined beam indicating a first target beam from the first set of candidate beams and a second target beam from the second set of candidate beams.
  • the network device 120-1 may determine the target combined beam from a plurality of combined beams based on results of the beam quality measurements.
  • the network device 120-1 generates a first indication indicating an identity of the first target beam and a second indication indicating an identity of the second target beam and an identity of the terminal device.
  • the network device 120-1 transmits the first indication to the terminal device and the second indication to the network device 120-2.
  • FIG. 8 shows a flowchart of an example method 800 for beam selection of multi-TRP according to some example embodiments of the present disclosure.
  • the method 800 can be implemented at the terminal device 110 as shown in FIG. 1.
  • the method 800 will be described with reference to FIG. 1.
  • the terminal device 110 receives a first indication indicating an identity of the first target beam from the network device 120-1, the first target beam from a first set of candidate beams and a second target beam from a second set of candidate beams are indicated by a target combined beam determined by the network device 120-1 based on the beam qualities of the first set of candidate beams received from the terminal device and the second set of candidate beams received from a network device 120-2.
  • the terminal device 110 may transmit to the network device 120-1, a reference signal, RS to enable the network device 120-1 to perform beam quality measurements for a plurality of combined beams based on the RS and feedback information transmitted from the network device 120-2, the first set of the candidate beams comprising a first beam group transmitted from the terminal device and a second set of the candidate beams comprising a second beam group transmitted from the network device 120-2, the plurality of combined beams being combined from the first beam group and the second beam group, the feedback information indicating the first set of the candidate beams, the second set of candidate beams and a channel between the terminal device and the network device 120-2.
  • RS reference signal
  • the terminal device 110 may transmit, to the network device 120-2, the RS to enable the network device 120-2 to generating the feedback information based on the RS.
  • FIG. 9 shows a flowchart of an example method 900 for beam selection of multi-TRP according to some example embodiments of the present disclosure.
  • the method 900 can be implemented at the network device 120-2 as shown in FIG. 1.
  • the method 900 will be described with reference to FIG. 1.
  • the network device 120-2 receives a second indication indicating an identity of the second target beam and an identity of a terminal device from the network device 120-1, a first target beam from a first set of candidate beams and the second target beam from a second set of candidate beams are indicated by a target combined beam determined by the network device 120-1 based on the beam qualities of the first set of candidate beams received from the terminal device and the second set of candidate beams received from a network device 120-2.
  • the network device 120-2 may receive a reference signal, RS from the terminal device and generate feedback information based on the RS, the feedback information indicating the first set of the candidate beams, the second set of candidate beams and a channel between the terminal device and the network device 120-2.
  • the network device 120-2 may further transmit the feedback information to the network device 120-1.
  • an apparatus capable of performing the method 400 may comprise means for performing the respective steps of the method 400.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus capable of performing the method 400 comprises means for determining, at a terminal device, beam qualities of a first set of candidate beams received from a primary network device and a second set of candidate beams received from a secondary network device; means for determining, based on the beam qualities, a target combined beam indicating a first target beam from the first set of candidate beams and a second target beam from the second set of candidate beams; means for generating an indication indicating an identity of the first target beam, an identity of the second target beam and an identity of the terminal device; and means for transmitting the indication to the primary network device.
  • an apparatus capable of performing the method 500 may comprise means for performing the respective steps of the method 500.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus capable of performing the method 500 comprises means for receiving, at a primary network device, an indication indicating an identity of the first target beam, an identity of the second target beam and an identity of the terminal device from a terminal device, the first target beam from a first set of candidate beams and the second target beam from a second set of candidate beams are indicated by a target combined beam determined by the terminal device based on the beam qualities of the first set of candidate beams received from the primary network device and the second set of. candidate beams received from a secondary network device; and means for transmitting the indication to the secondary network device.
  • an apparatus capable of performing the method 600 may comprise means for performing the respective steps of the method 600.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus capable of performing the method 600 comprises means for receiving, at a secondary network device, an indication indicating an identity of the first target beam, an identity of the second target beam and an identity of a terminal device from the primary network device, the first target beam from a first set of candidate beams and the second target beam from a second set of candidate beams are indicated by a target combined beam determined by the terminal device based on the beam qualities of the first set of candidate beams received from the primary network device and a second set of candidate beams received from the secondary network device.
  • an apparatus capable of performing the method 700 may comprise means for performing the respective steps of the method 700.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus capable of performing the method 700 comprise means for determining, at a primary network device, beam qualities of a first set of candidate beams received from a terminal device and a second set of candidate beams received from a secondary network device; means for determining, based on the beam qualities, a target combined beam indicating a first target beam from the first set of candidate beams and a second target beam from the second set of candidate beams; means for generating a first indication indicating an identity of the first target beam and a second indication indicating an identity of the second target beam and an identity of the terminal device; and means for transmitting the first indication to the terminal device and the second indication to the secondary network device.
  • an apparatus capable of performing the method 800 may comprise means for performing the respective steps of the method 800.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus capable of performing the method 800 comprise means for receiving, at a terminal device, a first indication indicating an identity of the first target beam, from the primary network device, the first target beam from a first set of candidate beams and a second target beam from a second set of candidate beams are indicated by a target combined beam determined by the primary network device based on the beam qualities of the first set of candidate beams received from the terminal device and the second set of candidate beams received from a secondary network device.
  • an apparatus capable of performing the method 900 may comprise means for performing the respective steps of the method 900.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus capable of performing the method 900 comprises means for receiving, at a secondary network device, a second indication indicating an identity of the second target beam and an identity of a terminal device, from the primary network device, a first target beam from a first set of candidate beams and the second target beam from a second set of candidate beams are indicated by a target combined beam determined by the primary network device based on the beam qualities of the first set of candidate beams received from the terminal device and the second set of candidate beams received from a secondary network device.
  • Fig. 10 is a simplified block diagram of a device 1000 that is suitable for implementing embodiments of the present disclosure.
  • the device 1000 may be provided to implement the terminal device 110 or the network device 120 as shown in FIG. 1.
  • the device 1000 includes one or more processors 1010, one or more memories 1020 coupled to the processor 1010, and one or more transmitters and/or receivers (TX/RX) 1040 coupled to the processor 1010.
  • TX/RX transmitters and/or receivers
  • the TX/RX 1040 is for bidirectional communications.
  • the TX/RX 1040 has at least one antenna to facilitate communication.
  • the communication interface may represent any interface that is necessary for communication with other network elements.
  • the processor 1010 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 1000 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the memory 1020 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 1024, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage.
  • ROM Read Only Memory
  • EPROM electrically programmable read only memory
  • flash memory a hard disk
  • CD compact disc
  • DVD digital video disk
  • RAM random access memory
  • a computer program 1030 includes computer executable instructions that are executed by the associated processor 1010.
  • the program 1030 may be stored in the ROM 1024.
  • the processor 1010 may perform any suitable actions and processing by loading the program 1030 into the RAM 1022.
  • the example embodiments of the present disclosure may be implemented by means of the program 1030 so that the device 1000 may perform any process of the disclosure as discussed with reference to Figs. 2 to 9.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 1030 may be tangibly contained in a computer readable medium which may be included in the device 1000 (such as in the memory 1020) or other storage devices that are accessible by the device 1000.
  • the device 1000 may load the program 1030 from the computer readable medium to the RAM 1022 for execution.
  • the computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • Fig. 11 shows an example of the computer readable medium 1100 in form of CD or DVD.
  • the computer readable medium has the program 1030 stored thereon.
  • various example embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. For example, in some embodiments, various examples of the present disclosure (e.g., a method, apparatus or device) may be partly or fully implemented on the computer readable medium.
  • the units included in the apparatuses and/or devices of the present disclosure may be implemented in various manners, including software, hardware, firmware, or any combination thereof.
  • one or more units may be implemented using software and/or firmware, for example, machine-executable instructions stored on the storage medium.
  • parts or all of the units in the apparatuses and/or devices may be implemented, at least in part, by one or more hardware logic components.
  • FPGAs Field-programmable Gate Arrays
  • ASICs Application-specific Integrated Circuits
  • ASSPs Application-specific Standard Products
  • SOCs System-on-a-chip systems
  • CPLDs Complex Programmable Logic Devices
  • embodiments of the present disclosure may be described in the context of the computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • a computer readable medium may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the computer readable medium may be a machine readable signal medium or a machine readable storage medium.
  • the computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • machine readable storage medium More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM portable compact disc read-only memory
  • magnetic storage device or any suitable combination of the foregoing.

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