WO2023106979A1 - Procédé exécuté dans un nœud de réseau pour configurer des transmissions en liaison descendante à un dispositif sans fil dans un réseau de communication sans fil - Google Patents

Procédé exécuté dans un nœud de réseau pour configurer des transmissions en liaison descendante à un dispositif sans fil dans un réseau de communication sans fil Download PDF

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Publication number
WO2023106979A1
WO2023106979A1 PCT/SE2021/051227 SE2021051227W WO2023106979A1 WO 2023106979 A1 WO2023106979 A1 WO 2023106979A1 SE 2021051227 W SE2021051227 W SE 2021051227W WO 2023106979 A1 WO2023106979 A1 WO 2023106979A1
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WO
WIPO (PCT)
Prior art keywords
network node
csisrs
pgob
wireless device
gob
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PCT/SE2021/051227
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English (en)
Inventor
Niklas JALDÉN
Henrik Asplund
Svante Bergman
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Telefonaktiebolaget Lm Ericsson (Publ)
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Priority to PCT/SE2021/051227 priority Critical patent/WO2023106979A1/fr
Publication of WO2023106979A1 publication Critical patent/WO2023106979A1/fr

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    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H04B7/0421—Feedback systems utilizing implicit feedback, e.g. steered pilot signals

Definitions

  • the present disclosure relates to configuration of downlink transmissions to a wireless device in a wireless communications network.
  • the disclosed technology relates to a network node and a method therein for configuration of downlink transmissions to a wireless device in a wireless communications network.
  • AAS advanced antenna systems
  • One common technique for obtaining channel state information in a multi antenna system is the use of standardized codebooks.
  • the base stations, BS transmit a training sequence that the User Equipment's, wireless devices, listen to in order to derive a good option for a downlink, DL, precoder that it signals back to the BS.
  • the codebooks contain a limited set of combinations of DL precoding options.
  • Standardized codebooks typically provide a good balance of uplink, UL, signaling overhead in relation to DL single user beamforming gain, and hence beamforming throughput gain. From theory, it is known that linear phase front precoders are optimal in no angular spread scenarios or asymptotically low Signal to Noise Ratio, SNR, regions. Standardized codebooks are examples of these linear phase front precoders with a limited resolution in angular pointing directions.
  • SRS based channel information is typically well suited for time division duplexing, TDD, systems where the UL and DL occupy the same bands.
  • the SRS based channel state information method typically provides richer information of the actual channel condition and hence better suited for higher order MIMO, multiple-input and multiple-output, transmissions and multi-user-MIMO, MU -Ml MO.
  • the CSI acquisition is based on UL sounding it is dependent on the UL power and may therefore not be optimal in poor coverage situations.
  • a problem with the solutions of the prior art is how and/or when to utilize codebookbased and/or SRS based CSI acquisition methods.
  • the SRS resources is a limited resource and can therefore not be allocated to wireless devices that would not benefit from said resource. Further, as the SRS resources needed for a user to provide CSI is limited, it is important for a well working AAS system to allocate these resources to wireless devices that benefit from using such. In today's systems there are no methods for assessing if a wireless device would benefit from SRS based CSI acquisition besides trial and error.
  • a method performed in a network node for configuring a downlink, DL, transmission to a wireless device from the network node in a wireless communications network comprising: obtaining a CSI report, CSISRS-GOB, which is an estimation of what the CSI would be if a wireless device, not currently allocated SRS resources, would be allocated SRS resources by the network node, wherein the CSISRS-GOB is based on at least one CSI report, CSISRS, originating from wireless devices previously allocated SRS resources by the network node; obtaining information indicating a codebook-based CSI report, CSIGOB, from the wireless device; matching CSIGOB with CSISRS-GOB; obtaining, based on the matching, a first performance estimate, PGOB, of DL transmissions towards the wireless device based on CSIGOB and CSISRS-GOB and a second performance estimate, Preci, of DL transmissions towards the wireless device based on at least one CSISRS;
  • a network node for configuring a downlink, DL, transmission to a wireless device from the network node in a wireless communications network is configured to obtain a CSI report, CSISRS-GOB, which is an estimation of what the CSI would be if a wireless device, not currently allocated SRS resources, would be allocated SRS resources by the network node, wherein the CSISRS-GOB is based on at least one CSI report, CSISRS, originating from wireless devices previously allocated SRS resources by the network node; obtaining information indicating a codebook-based CSI report, CSIGOB, from the wireless device; match, CSIGOB with CSISRS-GOB; obtain, based on the matching, a first performance estimate, PGOB, of DL transmissions towards the wireless device based on CSIGOB and CSISRS-GOB and a second performance estimate, Preci, of DL transmissions towards the wireless device based on at least one CSISRS; compare the PGOB with the
  • a computer program is also provided configured to perform the method described above.
  • carriers are also provided configured to carry the computer programs configured for performing the method described above.
  • Fig. la schematically illustrates a network node in a wireless network performing network configuration according to some embodiments of the disclosed technology.
  • Fig. lb is a signalling diagram illustrating embodiments of a network node, performing network configuration according to some embodiments of the disclosed technology.
  • Fig. 2 is a flowchart depicting embodiments of a method in a network node in a wireless network performing network configuration according to some embodiments of the disclosed technology.
  • Fig. 3 is a block diagram depicting embodiments of a network node.
  • wireless devices may refer to any type of wireless device or User Equipment, UE, communicating with a network node in a cellular, mobile or radio communication network or system.
  • Examples of such wireless devices are loT devices, mobile phones, cellular phones, Personal Digital Assistants (PDAs), smart phones, tablets, sensors equipped with a UE, Laptop Mounted Equipment (LME) (e.g. USB), Laptop Embedded Equipments (LEEs), Machine Type Communication (MTC) devices, or Machine to Machine (M2M) device, Customer Premises Equipment (CPE), wireless device capable of machine to machine (M2M) communication, Vehicle-to-Vehicle, V2V, wireless device, or V2x wireless devices, etc.
  • LME Laptop Mounted Equipment
  • LEEs Laptop Embedded Equipments
  • MTC Machine Type Communication
  • M2M Machine to Machine
  • CPE Customer Premises Equipment
  • the wireless devices may be have a single antenna or multiple antennas, i.e. more than one antenna, in order to support Single User MIMO, SU-MIMO, or Multi-User MIMO, MU-MIMO, transmissions.
  • the wireless device 101, 103 may be a wireless device, such as, a cell phone device.
  • SRS based CSI acquisition SRS based channel information
  • SRS resources SRS based channel information
  • SRS based channel state information SRS channel information
  • Codebook based CSI acquisition codebook based transmission
  • codebook resources codebook based beamforming
  • codebook CSI codebook CSI
  • GoB Grid-of-Beams
  • CSIGOB or sometime referred to as CSIGOB report, is the CSI-report the network node receives from the wireless device in codebook-based CSI operation according to the background art
  • CSISRS or sometime referred to as CSISRS report, is the CSI the network node derives from an uplink SRS transmission according to the background art
  • CSISRS-GOB or sometime referred to as CSISRS-GOB report, is a CSI where the network node determines an estimate of the CSIGOB report, i.e., an expected CSIGOB based on the more detailed information available in the CSISRS report.
  • the CSISRS-GOB is an estimation of what the CSI would be if a wireless device, not currently allocated SRS resources, would be allocated SRS resources.
  • the functionality of the CSISRS-GOB is mapping between the CSI GoB and the CSI SRS-
  • second performance estimate refers to expected downlink performance when data is precoded based on SRS channel information and is denoted Preci.
  • first performance estimate refers to whereas performance when data is precoded based on codebook CSI and is denoted PGOB.
  • Fig. la illustrates a simplified architecture of a wireless communications network 100.
  • the wireless communications network 100 is described here in Fig. 1 as an LTE-based radio communications network, but may also employ technology of any one of 5G NR (New Radio), Long Term Evolution (LTE), LTE-Advanced, Wideband Code Division Multiple Access (WCDMA), Global System for Mobile communications/Enhanced Data rate for GSM Evolution (GSM/EDGE), Worldwide Interoperability for Microwave Access (WiMax), Ultra Mobile Broadband (UMB) or GSM, or any other similar network or system.
  • the wireless communication network 10 may also be an Ultra Dense Network, UDN, which e.g. may transmit on millimetre-waves (mmW).
  • mmW millimetre-waves
  • the wireless communications system network 100 may comprise any number of wired or wireless networks, any number of wireless devices, any number of network nodes, and/or any other components or systems that may facilitate or participate in the communication of data and/or signals over radio links in the wireless communications network 100.
  • the wireless communication network 100 comprises a network node 110 configured to configuring a downlink, DL, transmission to a wireless device 101.
  • the network node 110 has access to a database 112 comprising historical SRS-reports and codebook-based CSI-data, obtained from a plurality of wireless devices 103 historically allocated with SRS-based CSI acquisition, as well as standardized codebook-based CSI acquisition.
  • Method 200 (further described in detail in relation to Fig.2) aim to determine whether or not the wireless device 101, currently allocated with codebook based transmission, would benefit from using SRS resources instead of codebook-based transmission.
  • Fig. lb illustrates a signalling diagram of the wireless communication network 100 shown in Fig. la.
  • the network node 110 obtain SRS-based CSI acquisition-data from a plurality of wireless devices 103 previously allocated with SRS-based CSI acquisition.
  • the network node 110 stores the obtained data in the database 112.
  • the network node 110 may also obtain codebook-based CSI- data from a plurality of wireless devices 103 previously allocated with standardized codebookbased CSI acquisition.
  • the network node 110 stores the obtained data in the database 112.
  • the codebook-based CSI-data is gathered as follow:
  • the network node 110 transmits (103-i) a training sequence to the wireless device 103.
  • the wireless device 103 derives (103-ii) a good option for a DL precoder, which is transmitted (103-iii) to the network node 110.
  • the CSI-report which the network node 110 receives from the wireless device 103 denoted CSIGOB in this application, may be stored (103-iv) in the database 112. For ease of reading, it can be assumed that the CSIGOB is stored in the database 112, unless otherwise is stated.
  • the SRS-based CSI acquisition-data is gathered as follow:
  • the wireless devices 103 sends (103-v) a training sequences, Sounding Reference Signals, SRS, to the network node 110.
  • the network node 110 estimates (103-vi) the UL channel, and then by utilizing (103-vii) that the wireless channels are reciprocal, the UL estimate is used for deriving downlink, DL, precoding.
  • the network node 110 has derived the CSI from the uplink SRS transmission, denoted CSISRS, the CSISRS, and/or data related to the CSISRS, e.g., a covariance information is stored (103-viii) in the database 112.
  • the network node 110 transmits (101-i) a training sequence that the wireless device 101 receives.
  • the wireless device 101 derives (101-ii) a good option for a DL precoder, which is transmitted (101-iii) to the network node 110.
  • the CSI-report which the network node 110 receives from the wireless device 101 denoted CSIGOB in this application, may be stored in the database 112. For ease of reading, it can be assumed that the CSIGOB is stored (101-v) in the database 112, unless otherwise is stated.
  • the network node 110 obtains (101-iv) information indicating a codebook-based report, e.g., an estimate of the CSIGOB report from reciprocity of an early uplink transmissions, e.g., the random access, RACH). This way, the network node 110 does not need to obtain the actual CSIGOB report.
  • a codebook-based report e.g., an estimate of the CSIGOB report from reciprocity of an early uplink transmissions, e.g., the random access, RACH.
  • the network node 110 in the wireless communication network 100 gathers historical data in the database 112.
  • the database 112 comprises a historical data metric for when SRS resources were used, together with the CSIGOB reports.
  • the Historical data metric comprises historical performance metrics and/or other data from which performance can be determined.
  • the method 200 further disclosed in relation to Fig.2 describes how these stored historical measurement can be requested (112-i) and obtained (112-ii) by the network node 110, and thereby used to determine if a wireless device 101 would benefit from using SRS resources or codebook.
  • Fig. 2 is a flowchart depicting embodiments of a method 200 in a network node 110 in a wireless communication network 100 performing network configuration according to some embodiments of the disclosed technology.
  • the first aspect of this disclosure shows a method 200 performed in a network node 110 for configuring a downlink, DL, transmission to a wireless device 101 from the network node 110 in a wireless communications network 100.
  • the method 200 comprises the following steps. Obtaining 202 a CSI report, CSISRS-GOB, which is an estimation of what the CSI would be if a wireless device, not currently allocated SRS resources, would would have been allocated with SRS resources by the network node 110.
  • the PMI is derived as the direction where the majority of the received signal power come from. From extensive log comparisons, the strongest direction of the wide-band average angular direction coincides with the best PMI report form the wireless devices in a majority of the measured locations.
  • the CSISRS-GOB is based on at least one previously obtained 201 CSI report, CSISRS, which originates from a plurality of wireless devices 103 previously allocated SRS resources by the network node 110.
  • the method is also obtaining 203 information indicating a codebook-based CSI report, CSIGOB, from the wireless device 101.
  • the CSIGOB is a codebook-based CSI report, or an estimate of a codebook-based CSI report.
  • the estimate of a codebook-based CSI report is estimated from reciprocity of early uplink, UL, transmissions.
  • the estimation of the CSIGOB is based on a rough estimate of a Precoding Matric Indicator, PMI, direction, for example extracted from Random Access Channel, RACH, transmission.
  • the method is also matching 204 the CSIGOB with CSISRS-GOB.
  • the matching 204 aims to match samples with the same or similar CSI-indicators, e.g., PMI, Rl and/or CQI from the wireless device 101 and the wireless devices 103.
  • the CSIGOB is compared with the plurality of CSISRS-GOB.
  • the matching 204 between the obtained CSIGOB from wireless device 101 and the CSISRS-GOB is performed in order to determine what information to obtain from the database 112.
  • the method 200 proceeds by obtaining 205, based on the matches from the matching 204 a first performance estimate, PGOB, and a second performance estimate, Preci, of DL transmissions towards the wireless device 101.
  • the PGOB towards the wireless device 101 is based on codebook-based CSI reports, CSIGOB, and the CSISRS-GOB; and the Preci of DL transmissions towards the wireless device 101 is based on the SRS-based CSI-reports, CSISRS.
  • the method is then comparing 207 the obtained PGOB, and Preci. After the comparison 207 is performed, the method 200 has determined which of the SRS-based CSI or codebook-based CSI the wireless device 101 would benefit from.
  • the method configuring 209 the DL transmission to the wireless device 101 from the network node 110 based on the comparison 207 of the PcoB and Preci.
  • the configuring 209 comprises configuring the wireless device 110 with SRS resources if Preci is greater than PGOB.
  • determining 202 the CSISRS-GOB is based on channel information and/or estimations of said channel information, which are obtained from the CSISRS.
  • the determining 202 can carried out by utilizing the channel information H, comprised in the CSISRS, and the precoding matric w.
  • the equation determines the w out of a set of all w in a given codebook that maximizes the DL received power. arg max
  • the method 200 further comprises obtaining 201 the CSISRS, which originates from wireless devices 103 previously allocated SRS resources by the network node 110, based on the assumption that the uplink, UL, channel is reciprocal with the downlink, DL channel.
  • the method 200 further comprises storing 206 in a database 112, the CSI SRS GOB, and the PGOB and the Preci, and/or Spatial Channel Information, wherein the Spatial Channel Information is the channel H, or an estimate of the channel H, or the covariance information R.
  • the complete CSISRS is stored in the database 112 instead of parts the data related to the CSISRS, e.g., a covariance information
  • the database 112 can be used as a source which can provide indications if a wireless device would benefit from using SRS-based CSI over codebook-based CSI.
  • each CSISRS- GOB comprises information of corresponding CSISRS.
  • storing the PGOB and the Preci allows the network node 110 to reuse the measurements and thereby obtain a faster and a more efficient method. However, if desirable, the PGOB and/or the Preci can be recalculated.
  • the matching 204 of CSIGOB with CSISRS-GOB further comprises that the CSISRS-GOB comprises historically experienced CSI obtained from the database 112.
  • the method 200 obtains a plurality of CSISRS-GOB, which are calculated in advance, i.e., the plurality of CSISRS-GOB define a set of historical estimates of CSIGOB.
  • the CSIGOB originating from the wireless device 101 can be compared to a set of historically estimated CSISRS-GOB:S. Put differently they can be matched, with a plurality of historical estimations of CSIGOB:S. This allows the method 200 to improve the matching process, which will affect the proceeding step of comparing 207 the PGOB and the Preci and make the comparison of the PGOB and the P re ci more reliable.
  • the matching 204 of the CSIGOB with the CSISRS-GOB is based on Precoding Matrix Indicator, PMI; Rank Indication, Rl, and/or Channel Quality Indicator, CQL
  • the matching 204 may be performed by comparing CSI reported by wireless device 101 with SRS estimated PMI.
  • obtaining 205 PGOB, and P reCi further comprises estimating 205a PGOB, based on channel state information, CSI, retrieved from the database 112, and Preci, based on channel state information, CSI, retrieved from the database 112.
  • PGOB, and Preci can be estimated by obtain essential data stored in the database 112.
  • obtaining 205 further comprises retrieving 205b, from the database 112, historically experienced performance PGOB and Preci which relates to the performance of the wireless devices 103 when using SRS resources and codebook resources.
  • the PGOB as well as the CSISRS on which Preci is based on may be stored in the database 112.
  • the estimated Preci and CSISRS can then be obtained from the database 112.
  • comparing 207 further comprises comparing 207a the difference between the PGOB and the Preci to a predetermined threshold value a.
  • the threshold value a is designed to provide a desirable ratio of SRS-based CSI and codebook-based CSI in the wireless communication network 100. In inter words, the threshold value a may be set to adjust the performance estimate needed in order to be allocated SRS resources.
  • comparing 207 further comprises comparing 207b the different of the PGOB and the Preci to a predetermined tuning factor R.
  • the Preci may be compared to R * PGOB. This enables to adjust the overall usage of SRS based CSI in relation to codebook based CSI configurations to a target level.
  • the tuning factor R is an individual tuning factor ft for different groups of SRS reports.
  • the group of wireless devices 103 may be clustered into smaller groups having different tuning factors ft for each of the SRS report groups types. This further improves the flexibility to adjust the overall usage of SRS based CSI in relation to codebook based CSI configurations.
  • the comparing 207 further comprises updating 207c the tuning factor R based on complete SRS report, or long term average of the SRS report, and/or the use of combined information of relative values of PGOB and PGOB together with acknowledgment, ACK, and negative-acknowledgment, NACK, information from the wireless device 101.
  • the tuning factor may be updated by considering the relative values of the performance, e.g., to tune that the system get a 50% usage of each configuration.
  • the relative tuning factor may be determined form these without going through the performance.
  • the threshold value a is the same value as the tuning factor R.
  • the tuning factor R allows the method 200 to adjust the balance of the resources in the wireless communication system.
  • the ratio of the tuning factor R may be adjusted for different scenarios, e.g., maximizing throughput or optimizing energy consumption.
  • the configuring 209 of DL transmission further comprises allocating SRS resources based on the load on the wireless communications network 100. This could be the case when there is no risk that the SRS resources could become limited, and the performance criteria may be ignored. For example, if it is determined that a wireless device will benefit from using SRS-based CSI over codebook-based CSI, and there are SRS resources available, the wireless device may be configured with SRS-based CSI without further ado.
  • the method also comprises updating 210 the obtained PGOB and/or Preci, based on information of the used bitrate, acknowledgment, ACK, and/or negativeacknowledgment, NACK.
  • the network node 110 is a radio base station.
  • the network node 110 may comprise the following arrangement depicted in Fig 3.
  • Fig 3 shows a schematic block diagram of embodiments of a network node 110.
  • the embodiments of the network node 110 described herein may be considered as independent embodiments or may be considered in any combination with each other to describe non-limiting examples of the example embodiments described herein.
  • known conventional features of a network node 110 such as, for example, at least one antenna and a power source, e.g. a battery or main connection, may be assumed to be comprised in the network node 110 but is not shown or described any further in regards to Fig. 3.
  • the network node 110 may comprise processing circuitry 320 and a memory 323.
  • the processing circuitry 320 may also comprise a receiving module 321 and a transmitting module 322.
  • the receiving module 321 and the transmitting module 322 may comprise Radio Frequency, RF, circuitry and baseband processing circuitry capable of transmitting and receiving a radio signal in the wireless communications network 100.
  • the receiving module 321 and the transmitting module 322 may also form part of a single transceiver. It should also be noted that some or all of the functionality described in the embodiments above as being performed by the network node 110 may be provided by the processing circuitry 320 executing instructions stored on a computer-readable medium, such as the memory 323 shown in Fig. 3.
  • Alternative embodiments of the network node 110 may comprise additional components, such as, for example, an obtaining module 302, receiving module 303, matching module 304, obtaining module 305, comparing module 307, configuring module 309 responsible for providing its functionality to support the embodiments described herein.
  • the network node 110 or processing circuitry 320 is configured to, or may comprise the obtaining module 302 configured to obtaining a CSI report, CSISRS-GOB; receiving module 303 configured to receiving a codebook-based CSI report, CSIGOB; the matching module 304 configured to matching CSIGOB with CSISRS-GOB; the obtaining module 305 for obtaining a first performance estimate, PGOB, and a second performance estimate, Preci; the comparing module 307 for comparing the PGOB and the P re ci; and the configuring module 309 for configuring the DL transmission to the wireless device from the network node 110.
  • the network node 110 or processing circuitry 320 is configured to, or may comprise a updating module 310 configured to, update the obtained PGOB and/or the P re ci based on information of the used bitrate, acknowledgment, ACK, and/or negative-acknowledgment, NACK.
  • a updating module 310 configured to, update the obtained PGOB and/or the P re ci based on information of the used bitrate, acknowledgment, ACK, and/or negative-acknowledgment, NACK.
  • the network node 110 or processing circuitry 320 is configured to, or may comprise a obtaining module 301 configured to, obtain the CSISRS, which originates from wireless devices 103 previously served SRS resources by the network node, based on the assumption that the uplink, UL, channel is reciprocal with the downlink, DL, channel.
  • a computer-readable medium may include removable and nonremovable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc.
  • program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types.
  • Computerexecutable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.

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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 un nœud de réseau (110) conçu pour configurer une transmission en liaison descendante à un dispositif sans fil (101) depuis le nœud de réseau dans un réseau sans fil. Un procédé d'après la présente invention comprend les étapes consistant à : obtenir (202) un rapport de CSI estimées, CSISRS-GoB, qui est une estimation de ce que seraient les CSI si le nœud de réseau (110) attribuait des ressources de SRS à un dispositif sans fil, les CSISRS-GoB étant basées sur des rapports de CSI (201) obtenus, CSISRS, provenant de dispositifs sans fil (103) auxquels le nœud de réseau a préalablement attribué des ressources de SRS ; recevoir (203) un rapport de CSI basé sur un livre de codes, CSIGoB, provenant du dispositif sans fil (101) ; mettre en correspondance (204) CSIGoB et CSISRS-GoB ; sur la base de la correspondance, obtenir (205) des première et seconde estimations de performances de transmissions en liaison descendante, PGoB et Preci, sur la base de CSIGoB, de CSISRS-GoB et de CSISRS respectivement ; comparer (207) PGoB et Preci ; et configurer (209) la transmission en liaison descendante sur la base de la comparaison (207). La présente invention concerne également un procédé exécuté par le nœud de réseau, un produit programme d'ordinateur et un support.
PCT/SE2021/051227 2021-12-09 2021-12-09 Procédé exécuté dans un nœud de réseau pour configurer des transmissions en liaison descendante à un dispositif sans fil dans un réseau de communication sans fil WO2023106979A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020063729A1 (fr) * 2018-09-27 2020-04-02 Qualcomm Incorporated Analyse de signal de référence d'informations d'état de canal (csi-rs) de liaison descendante guidée par un signal de référence de sondage (srs)
WO2020108637A1 (fr) * 2018-11-30 2020-06-04 华为技术有限公司 Procédé et appareil de configuration de sondage de canal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020063729A1 (fr) * 2018-09-27 2020-04-02 Qualcomm Incorporated Analyse de signal de référence d'informations d'état de canal (csi-rs) de liaison descendante guidée par un signal de référence de sondage (srs)
WO2020108637A1 (fr) * 2018-11-30 2020-06-04 华为技术有限公司 Procédé et appareil de configuration de sondage de canal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MOROZOV G ET AL: "A novel combined CSI feedback mechanism to support multi-user MIMO beamforming schemes in TDD-OFDMA systems", ULTRA MODERN TELECOMMUNICATIONS AND CONTROL SYSTEMS AND WORKSHOPS (ICUMT), 2010 INTERNATIONAL CONGRESS ON, IEEE, PISCATAWAY, NJ, USA, 18 October 2010 (2010-10-18), pages 896 - 900, XP031840951, ISBN: 978-1-4244-7285-7 *

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