WO2024089450A1 - Mécanisme de repli pour formation de faisceau basée sur livre de codes dans un aas - Google Patents

Mécanisme de repli pour formation de faisceau basée sur livre de codes dans un aas Download PDF

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Publication number
WO2024089450A1
WO2024089450A1 PCT/IB2022/060355 IB2022060355W WO2024089450A1 WO 2024089450 A1 WO2024089450 A1 WO 2024089450A1 IB 2022060355 W IB2022060355 W IB 2022060355W WO 2024089450 A1 WO2024089450 A1 WO 2024089450A1
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WIPO (PCT)
Prior art keywords
ssbri
report
pmi
valid
base station
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PCT/IB2022/060355
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English (en)
Inventor
Yongquan Qiang
Hong Ren
Jianguo Long
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Telefonaktiebolaget Lm Ericsson (Publ)
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Priority to PCT/IB2022/060355 priority Critical patent/WO2024089450A1/fr
Publication of WO2024089450A1 publication Critical patent/WO2024089450A1/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
    • H04B7/0619—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 using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • 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
    • H04B7/0619—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 using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • 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
    • H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
    • H04B7/06958—Multistage beam selection, e.g. beam refinement

Definitions

  • the present application relates generally to beamforming in an active antenna system, and more specifically to a fallback mechanism for codebook-based beamforming.
  • AAS Active Antenna System
  • 4G LTE and 5G NR to enhance the wireless network performance and capacity by using full dimension Multiple Input Multiple Output (FD-MIMO) or massive MIMO.
  • FD-MIMO Multiple Input Multiple Output
  • a typical AAS system consists of two-dimensional antenna elements array with M rows 102, N columns 104 and two polarizations 106 (cross-polarization) as shown in Figure 1.
  • Beamforming is used in AAS to form User Equipment device (UE)-specific beams towards a destination UE, which helps to increase the signal power to the destination UE and reduce the interference to other UEs.
  • UE User Equipment device
  • H DL is the downlink (DL) channel matrix with dimension of N r x N t
  • N t 2MN is the number of transmitting antennas at a base station (gNB) side.
  • N r is the number of receiving antennas at UE side.
  • W is the precoding matrix with N t x v. v is the number of transmission layers.
  • UBF UE-specific BF
  • DFT Discrete Fourier Transform
  • PMI Precoding Matrix Indicator
  • Subsector-specific BF (SBF) 206 a The cell is split into several subsectors, each of which is covered by one of subsector-specific beams. Subsector-specific beam is selected based on UE reported Synchronization Signal/Physical Broadcast Channel Block Resource Indicator (SSBRI). SBF has a wider beam width and a moderate beamforming gain relative to UBF.
  • SSBRI Synchronization Signal/Physical Broadcast Channel Block Resource Indicator
  • CBF Cell-specific BF 208 a.
  • the signals are broadcasted in a cell by a common beam.
  • CBF has a cellwise beam width and lowest beamforming gain relative to UBF and SBF.
  • the Channel State Information Reference Signal (CSI-RS) resource with a number of ports P CSI RS 2N 1 N 2 is configured together with codebook configuration of (N lf N 2 ). PMI is reported by the UE based on a configured CSI-RS resource and codebook.
  • CSI-RS Channel State Information Reference Signal
  • the precoding matrix with codebook-based approach can be expressed by:
  • W p2a is a CSI-RS port-to-antenna mapping matrix with a N t x P CS[ RS ;
  • W PM[ is a precoding matrix with dimension of P CSi RS x v
  • W PM[ is derived from UE's PMI report, based on the codebook defined in 3GPP TS 38.214 V15.4.0
  • Oi, 0 2 are oversampling rate for beams in the horizontal and vertical directions, where:
  • v t and v m denote horizontal and vertical beams formed by over-sampled DFT vectors with all available antenna ports in horizontal and vertical directions, expressed by: where (l,m) and (Z',m') are beam indexes in horizontal and vertical direction, which can be determined from UE reported PMI (ii,i, ii, 2 i,3 2), denoted by:
  • SSB beam sweeping is introduced. That is, instead of broadcasting a single common beam, multiple narrow SSB beams are transmitted in an alternate way in a SSB burst window ( ⁇ 5ms) with a configurable periodicity (e.g., 20ms).
  • FIG. 3 An example of SSB beam sweeping with 8 beams is illustrated in Figure 3.
  • 8 SSB beams with index from 0 to 7 are beamformed towards different directions alternately in different SSB burst positions 302, 304, 306, and 308.
  • Each of the four SSB burst positions occupies four continuous OFDM symbols in time domain and 20 PRBs in frequency domain.
  • a gNB can request UE to report SSBRI in each CSI report together with PMI, Rank Indicator (RI), and Channel Quality Indicator (CQI).
  • RI Rank Indicator
  • CQI Channel Quality Indicator
  • the gNB can apply subsector-specific beamforming on Physical Downlink Shared Channel (PDSCH) or Physical Downlink Control Channel (PDCCH) based on SSBRI.
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • PMI-based UBF With PMI-based UBF, higher BF gain can be achieved if the received PMI is valid. However, the PMI is not always robust. For example, it may be polluted by inter-cell interference or PDSCH leakage. If an invalid PMI is received at gNB side, the beam is likely directed to a wrong direction. As shown in the graph 402 of Figure 4, if the desired UE is in direction of beam 404, a wrong PMI with a beam towards the direction of beam 406 could be received at the gNB side. As a result, negative BF gain is experienced.
  • Another problem is that there is no reference for PMI validation at gNB side. When a PMI is received, it is hard to know if it is valid or not.
  • a Precoding Matrix Indicator (PMI) report and a Synchronization Signal/Physical Broadcast Channel Resource Indicator (SSBRI) report is received at a base station from a User Equipment device (UE).
  • the base station validates the PMI and the SSBRI in the PMI report and the SSBRI report, and if the PMI and the SSBRI are valid, the base station performs PMI-based UE specific beamforming (UDF) for a communication to the UE.
  • PMI Precoding Matrix Indicator
  • SSBRI Synchronization Signal/Physical Broadcast Channel Resource Indicator
  • the base station performs SSBRI-based Subsector-specific beamforming (SBF) for the communication to the UE. If the PMI and the SSBRI are both invalid, the base station can perform Cell-specific beamforming (CBF) for the communication to the UE.
  • SBF SSBRI-based Subsector-specific beamforming
  • CBF Cell-specific beamforming
  • method implemented in a base station for providing a fallback mechanism for Codebook Based Beamforming in an AAS can include receiving, from a User Equipment device (UE) a PMI report and a SSBRI report, determining whether the PMI report and the SSBRI report are valid, determining whether the PMI report and the SSBRI report are valid; in response to the PMI report and the SSBRI report being valid, performing PMI-based UE-specific Beamforming (UBF) for a communication to the UE, in response to the PMI report not being valid, and the SSBRI report being valid, performing Subsector-specific Beamforming (SBF) for the communication to the UE, and in response to the SSBRI report not being valid, performing Cell-specific Beamforming (CBF) for the communication to the UE.
  • UE User Equipment device
  • the method can include determining that the PMI report is valid based on a predefined mapping between PMI information from the PMI report and SSBRI information from the SSBRI report.
  • the predefined mapping includes one or more PMI for every SSBRI.
  • the method can further include determining whether the SSBRI report is valid based on an amount that SSBRI varies from a reference SSBRI for the UE.
  • the reference SSBRI is from a previous SSBRI report.
  • the reference SSBRI is a mode filtered SSBRI from a plurality of previous SSBRI reports received during a predefined period of time.
  • the method can include providing, to the UE, a request to provide the PMI report and the SSBRI report.
  • the request is provided via Channel State Information (CSI) request bits in Downlink Control Information (DCI).
  • CSI Channel State Information
  • DCI Downlink Control Information
  • the PMI reports are received at a first periodicity and the SSBRI reports are received at a second periodicity, wherein the second periodicity is longer than the first periodicity.
  • the method can further include determining that the PMI report is valid in response to the SSBRI report being valid, and determining that the PMI report is invalid in response to the SSBRI report being invalid.
  • the method can further include determining whether the PMI report is valid based on an amount that PMI varies from a reference PMI for the UE.
  • the reference PMI is from a previous PMI report.
  • the reference PMI is a mode filtered PMI from a plurality of previous PMI reports received during a predefined period of time.
  • a base station configured to providing a fallback mechanism for Codebook Based Beamforming in an AAS, the base station comprising a radio interface and processing circuitry associated with the radio interface, wherein the processing circuitry is configured to cause the base station to receive, from a UE, a PMI, report and a SSBRI report.
  • the processing circuitry is further configured to determine whether the PMI report and the SSBRI report are valid, in response to the PMI report and the SSBRI report being valid, perform PMI-based UE-specific Beamforming, UBF, for a communication to the UE, in response to the PMI report not being valid, and the SSBRI report being valid, perform Subsector-specific Beamforming, SBF, for the communication to the UE, and in response to the SSBRI report not being valid, perform CBF, for the communication to the UE.
  • the processing circuitry of the base station is further configured to determine that the PMI report is valid based on a predefined mapping between PMI information from the PMI report and SSBRI information from the SSBRI report.
  • the reference SSBRI is from a previous SSBRI report.
  • the reference SSBRI is a mode filtered SSBRI from a plurality of SSBRI reports received during a predefined period of time.
  • the processing circuitry of the base station is further configured to provide, to the UE, a request to provide the PMI report and the SSBRI report.
  • the request is provided via CSI request bits in DCI.
  • the PMI reports are received at a first frequency and SSBRI reports are received at a second frequency, wherein the second frequency is lower than the first frequency.
  • the processing circuitry is further configured to determine that the PMI report is valid in response to the SSBRI report being valid, and determine that the PMI report is invalid in response to the SSBRI report being invalid.
  • the processing circuitry of the base station is further configured to determine whether the PMI report is valid based on an amount that PMI varies from a reference PMI for the UE.
  • the reference PMI is from a previous PMI report.
  • the reference PMI is a mode filtered PMI from a plurality of previous PMI reports received during a predefined period of time.
  • a non-transitory computer-readable storage medium that includes executable instructions to cause a processor device of a network node to receive, from a UE, a PMI report, and a SSBRI report.
  • the processing circuitry is further configured to determine whether the PMI report and the SSBRI report are valid, in response to the PMI report and the SSBRI report being valid, perform PMI- based UE-specific Beamforming, UBF, for a communication to the UE, in response to the PMI report not being valid, and the SSBRI report being valid, perform Subsector-specific Beamforming, SBF, for the communication to the UE, and in response to the SSBRI report not being valid, perform Cell-specific Beamforming, CBF, for the communication to the UE.
  • the instructions can further cause the processor device to determine that the PMI report is valid based on a predefined mapping between PMI information from the PMI report and SSBRI information from the SSBRI report.
  • the instructions can further cause the processor device to determine whether the SSBRI report is valid based on an amount that SSBRI varies from a reference SSBRI for the UE.
  • Figure 1 illustrates an exemplary two-dimensional antenna element array
  • Figure 2 illustrates an exemplary graph depicting beamforming granularities in terms of beam width
  • FIG. 3 illustrates exemplary Synchronization Signal/Physical Broadcast Channel Block (SSB) beam sweeping
  • Figure 4 illustrates an exemplary graph depicting an invalid precoding matrix indicator and negative beamforming gain
  • Figure 5 illustrates an exemplary graph depicting beamforming gain of SSB beams over a common beam
  • Figure 6 illustrates an exemplary message sequencing chart and methodology for providing a fallback mechanism for Codebook Based Beamforming in an Active Antenna System (AAS) according to some embodiments of the present disclosure
  • Figure 7 illustrates one example of a cellular communications system according to some embodiments of the present disclosure
  • Figure 8 is a schematic block diagram of a radio access node according to some embodiments of the present disclosure.
  • Figure 9 is a schematic block diagram that illustrates a virtualized embodiment of the radio access node of Figure 8 according to some embodiments of the present disclosure
  • Figure 10 is a schematic block diagram of the radio access node of Figure 8 according to some other embodiments of the present disclosure.
  • FIG 11 is a schematic block diagram of a User Equipment device (UE) according to some embodiments of the present disclosure.
  • Figure 12 is a schematic block diagram of the UE of Figure 11 according to some other embodiments of the present disclosure.
  • Radio Node As used herein, a "radio node” is either a radio access node or a wireless communication device.
  • Radio Access Node As used herein, a “radio access node” or “radio network node” or “radio access network node” is any node in a Radio Access Network (RAN) of a cellular communications network that operates to wirelessly transmit and/or receive signals.
  • RAN Radio Access Network
  • a radio access node examples include, but are not limited to, a base station (e.g., a New Radio (NR) base station (gNB) in a Third Generation Partnership Project (3GPP) Fifth Generation (5G) NR network or an enhanced or evolved Node B (eNB) in a 3GPP Long Term Evolution (LTE) network), a high-power or macro base station, a low-power base station (e.g., a micro base station, a pico base station, a home eNB, or the like), a relay node, a network node that implements part of the functionality of a base station or a network node that implements a gNB Distributed Unit (gNB-DU)) or a network node that implements part of the functionality of some other type of radio access node.
  • a base station e.g., a New Radio (NR) base station (gNB) in a Third Generation Partnership Project (3GPP) Fifth Generation (5G) NR network or an enhanced or evolved Node B
  • a "communication device” is any type of device that has access to an access network.
  • Some examples of a communication device include, but are not limited to: mobile phone, smart phone, sensor device, meter, vehicle, household appliance, medical appliance, media player, camera, or any type of consumer electronic, for instance, but not limited to, a television, radio, lighting arrangement, tablet computer, laptop, or Personal Computer (PC).
  • the communication device may be a portable, hand-held, computer-comprised, or vehiclemounted mobile device, enabled to communicate voice and/or data via a wireless or wireline connection.
  • Wireless Communication Device One type of communication device is a wireless communication device, which may be any type of wireless device that has access to (i.e., is served by) a wireless network (e.g., a cellular network).
  • a wireless communication device include, but are not limited to: a User Equipment device (UE) in a 3GPP network, a Machine Type Communication (MTC) device, and an Internet of Things (loT) device.
  • UE User Equipment
  • MTC Machine Type Communication
  • LoT Internet of Things
  • Such wireless communication devices may be, or may be integrated into, a mobile phone, smart phone, sensor device, meter, vehicle, household appliance, medical appliance, media player, camera, or any type of consumer electronic, for instance, but not limited to, a television, radio, lighting arrangement, tablet computer, laptop, or PC.
  • the wireless communication device may be a portable, hand-held, computer-comprised, or vehicle-mounted mobile device, enabled to communicate voice and/or data via a wireless connection.
  • Network Node As used herein, a "network node” is any node that is either part of the RAN or the core network of a cellular communications network/system. [0063] Note that the description given herein focuses on a 3GPP cellular communications system and, as such, 3GPP terminology or terminology similar to 3GPP terminology is oftentimes used. However, the concepts disclosed herein are not limited to a 3GPP system. [0064] Note that, in the description herein, reference may be made to the term "cell”; however, particularly with respect to 5G NR concepts, beams may be used instead of cells and, as such, it is important to note that the concepts described herein are equally applicable to both cells and beams.
  • a Precoding Matrix Indicator (PMI) report and a Synchronization Signal/Physical Broadcast Channel Resource Indicator (SSBRI) report is received at a base station from a User Equipment device (UE).
  • the base station validates the PMI and the SSBRI in the PMI report and the SSBRI report, and if the PMI and the SSBRI are valid, the base station performs PMI-based UE specific beamforming (UDF) for a communication to the UE.
  • PMI Precoding Matrix Indicator
  • SSBRI Synchronization Signal/Physical Broadcast Channel Resource Indicator
  • the base station If the PMI is invalid, but the SSBRI is valid, the base station performs SSBRI-based Subsector-specific beamforming (SBF) for the communication to the UE. If the PMI and the SSBRI are both invalid, the base station can perform Cell-specific beamforming (CBF) for the communication to the UE.
  • SBF SSBRI-based Subsector-specific beamforming
  • CBF Cell-specific beamforming
  • a base station (gNB) 602 requests 606 a UE 604 to report both PMI and SSBRI.
  • the UE 604 provides the PMI and SSBRI in a PMI report and a SSBRI report at 608
  • PMI and SSBRI validation are performed at gNB side at 610.
  • a beamforming (BF) scheme is selected accordingly for PDSCH and Physical Downlink Control Channel (PDCCH).
  • PDCH Physical Downlink Control Channel
  • the BF fallback mechanism is triggered. Instead of directly falling back to CBF, additional stage is introduced. That is, if SSBRI is valid, the SSBRI-based SBF is first selected for the communication 618 to the UE 604. Then, if SSBRI is also invalid, regardless of whether the PMI is valid or not, the base station 602 fallback to CBF for the communication 620 to the UE 604. Obtaining PMI and SSBRI report from UE
  • the base station 602 can send a request to the UE 604 to report both PMI and SSBRI via Channel State Information (CSI) request bits in downlink control information (DCI).
  • CSI Channel State Information
  • DCI downlink control information
  • PMI and SSBRI report can be requested together at same time.
  • the periodicity of SSBRI report can be longer than that of PMI report.
  • the frequency at which SSBRI is requested and/or provided could be a lower frequency than the frequency at which PMI is requested and/or provided.
  • the UE 604 can provide to the base station 602 the PMI and the SSBRI in one or more reports.
  • the PMI and SSBRI can be included in a measurement report, and in other embodiments, the PMI and SSBRI can be included in respective PMI reports and a SSBRI reports.
  • the base station 602 can determine, at 610, whether the PMI or the SSBRI are valid.
  • the following sections discuss the various ways in which the base station 602 can perform the determination of whether the PMI and the SSBRI are valid.
  • the PMI report can be determined to be valid in response to the SSBRI report being valid, and determining that the PMI report is invalid in response to the SSBRI report being invalid.
  • the base station 602 can determine whether the PMI and/or the PMI report is valid based on determining that PMI information and SSBRI information are in a predefined mapping table.
  • the idea is to validate PMI based on the robust reference of SSBRI, by establishing an association between PMI and SSBRI. A set of PMIs with beams towards one SSB beam direction is grouped and mapped with the SSBRI.
  • the horizontal PMIs (ill) are ground into 4 groups and mapped to corresponding SSBRI as shown in Table 1.
  • PMI in set of ⁇ 17,18,19,20,21,22,23,25,26 ⁇ has beam radiation towards to direction of SSBRI 0.
  • PMI in set of ⁇ 0,31,30,29,28,27 ⁇ has beam radiation towards to direction of SSBRI 1.
  • PMI in set of ⁇ 0,1, 2, 3, 4, 5 ⁇ has beam radiation towards to direction of SSBRI 2.
  • PMI in set of ⁇ 6,7,8,9,10,11,12,13,14,15,16 ⁇ has beam radiation towards to direction of SSBRI 3.
  • PMI 0 is mapped with both SSBRI 1 and SSBRI 2.
  • the base station 602 can also determine at step 612 whether the PMI report is valid.
  • the validity can be based on a PMI variation distance.
  • the variation distance is discussed later in details for SSBRI, and all concepts apply to PMI.
  • Another approach is to assume a PMI is valid if SSBRI is valid, and PMI is invalid if SSBRI is invalid. It is reasonable, since the PMI error is mainly caused by poor UL link quality and decoding at gNB. In that case, if SSBRI is valid, it indicates the UL link quality is acceptable and the probability that the decoding results are correct is large. Thus, we can infer that the PMI is also valid. With this approach, it's better to have a same report periodicity applied on both PMI and SSBRI.
  • the base station 602 can determine at step 614 whether the SSBRI report is valid. In an embodiment, the validity can be based on an SSBRI variation distance being less than respective threshold variation distances. As an SSB beam is relatively wider than a Discrete Fourier Transform (DFT)-based beam, SSBRI is relatively robust compared with PMI. An SSBRI is assumed to be invalid if its variation distance is more than a threshold. Likewise, a PMI can be assumed to be invalid if its variation distance relative to a reference PMI is more than another threshold.
  • the SSBRI variation distance is a measure of how much the SSBRI changes over a period of time, and can be measured in two ways as following:
  • the variation distance between two adjacent SSBRIs, or a current SSBRI and a preceding SSBRI can be expressed by:
  • D is more than a predefined threshold variation distance
  • the received SSBRI i t is treated as invalid. For example, if D>1, it means that the SSBRI is jumping beyond the adjacent subsector, which is unlikely to happen physically.
  • the valid SSBRI is most likely fluctuating between two adjacent subsectors with distance of 1.
  • the determination of whether an SSBRI is valid or not is based on a comparison of a current SSBRi to a previous SSBRI, for a first received SSBRI, there is no reference to measure the variation distance. In this case, base station 602 will rely on CBF for the communication to the UE, as the presumption is the SSBRI is invalid.
  • a "mode” filter can be used to get the filtered SSBRI that occurs most often in past window, expressed by: where:
  • N The number of SSBRI reports in the past CSI report window from time slot of t - NT to t - T.
  • the number of SSBRI reports N for filtering is predefined parameters.
  • FIG. 7 illustrates one example of a cellular communications system 700 in which embodiments of the present disclosure may be implemented.
  • the cellular communications system 700 is a 5G system (5GS) including a Next Generation RAN (NG-RAN) and a 5G Core (5GC) or an Evolved Packet System (EPS) including an Evolved Universal Terrestrial RAN (E-UTRAN) and an Evolved Packet Core (EPC.
  • 5GS 5G system
  • NG-RAN Next Generation RAN
  • 5GC 5G Core
  • EPS Evolved Packet System
  • E-UTRAN Evolved Universal Terrestrial RAN
  • EPC Evolved Packet Core
  • the RAN includes base stations 702-1 and 702-2, which in the 5GS include NR base stations (gNBs) and optionally next generation eNBs (ng-eNBs) (e.g., LTE RAN nodes connected to the 5GC) and in the EPS include eNBs, controlling corresponding (macro) cells 704-1 and 704-2.
  • the base stations 702- 1 and 702-2 are generally referred to herein collectively as base stations 702 and individually as base station 702.
  • the base stations 702 can perform similar functions as base station 602 described above in their communications with UEs 712 (e.g., UE 604) Likewise, the (macro) cells 704-1 and 704-2 are generally referred to herein collectively as (macro) cells 704 and individually as (macro) cell 704.
  • the RAN may also include a number of low power nodes 706-1 through 706-4 controlling corresponding small cells 708-1 through 708-4.
  • the low power nodes 706-1 through 706-4 can be small base stations (such as pico or femto base stations) or RRHs, or the like.
  • one or more of the small cells 708-1 through 708-4 may alternatively be provided by the base stations 702.
  • the low power nodes 706-1 through 706-4 are generally referred to herein collectively as low power nodes 706 and individually as low power node 706.
  • the small cells 708-1 through 708-4 are generally referred to herein collectively as small cells 708 and individually as small cell 708.
  • the cellular communications system 700 also includes a core network 710, which in the 5G System (5GS) is referred to as the 5GC.
  • the base stations 702 (and optionally the low power nodes 706) are connected to the core network 710.
  • the base stations 702 and the low power nodes 706 provide service to wireless communication devices 712-1 through 712-5 in the corresponding cells 704 and 708.
  • the wireless communication devices 712-1 through 712-5 are generally referred to herein collectively as wireless communication devices 712 and individually as wireless communication device 712. In the following description, the wireless communication devices 712 are oftentimes UEs, but the present disclosure is not limited thereto.
  • FIG. 8 is a schematic block diagram of a radio access node 800 according to some embodiments of the present disclosure.
  • the radio access node 800 may be, for example, a base station 702 or 706 or a network node that implements all or part of the functionality of the base station 702 or gNB described herein.
  • the radio access node 800 includes a control system 802 that includes one or more processors 804 (e.g., Central Processing Units (CPUs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), and/or the like), memory 806, and a network interface 808.
  • the one or more processors 804 are also referred to herein as processing circuitry.
  • the radio access node 800 may include one or more radio units 810 that each includes one or more transmitters 812 and one or more receivers 814 coupled to one or more antennas 816.
  • the radio units 810 may be referred to or be part of radio interface circuitry.
  • the radio unit(s) 810 is external to the control system 802 and connected to the control system 802 via, e.g., a wired connection (e.g., an optical cable).
  • the radio unit(s) 810 and potentially the antenna(s) 816 are integrated together with the control system 802.
  • the one or more processors 804 operate to provide one or more functions of a radio access node 800 as described herein.
  • the function(s) are implemented in software that is stored, e.g., in the memory 806 and executed by the one or more processors 804.
  • FIG. 9 is a schematic block diagram that illustrates a virtualized embodiment of the radio access node 800 according to some embodiments of the present disclosure. This discussion is equally applicable to other types of network nodes. Further, other types of network nodes may have similar virtualized architectures. Again, optional features are represented by dashed boxes. [0084] As used herein, a "virtualized" radio access node is an implementation of the radio access node 800 in which at least a portion of the functionality of the radio access node 800 is implemented as a virtual component(s) (e.g., via a virtual machine(s) executing on a physical processing node(s) in a network(s)).
  • a virtualized radio access node is an implementation of the radio access node 800 in which at least a portion of the functionality of the radio access node 800 is implemented as a virtual component(s) (e.g., via a virtual machine(s) executing on a physical processing node(s) in a network(s)).
  • the radio access node 800 may include the control system 802 and/or the one or more radio units 810, as described above.
  • the control system 802 may be connected to the radio unit(s) 810 via, for example, an optical cable or the like.
  • the radio access node 800 includes one or more processing nodes 900 coupled to or included as part of a network(s) 902. If present, the control system 802 or the radio unit(s) are connected to the processing node(s) 900 via the network 902.
  • Each processing node 900 includes one or more processors 904 (e.g., CPUs, ASICs, FPGAs, and/or the like), memory 906, and a network interface 908.
  • functions 910 of the radio access node 800 described herein are implemented at the one or more processing nodes 900 or distributed across the one or more processing nodes 900 and the control system 802 and/or the radio unit(s) 810 in any desired manner.
  • some or all of the functions 910 of the radio access node 800 described herein are implemented as virtual components executed by one or more virtual machines implemented in a virtual environment(s) hosted by the processing node(s) 900.
  • additional signaling or communication between the processing node(s) 900 and the control system 802 is used in order to carry out at least some of the desired functions 910.
  • the control system 802 may not be included, in which case the radio unit(s) 810 communicate directly with the processing node(s) 900 via an appropriate network interface(s).
  • a computer program including instructions which, when executed by at least one processor, causes the at least one processor to carry out the functionality of radio access node 800 or a node (e.g., a processing node 900) implementing one or more of the functions 910 of the radio access node 800 in a virtual environment according to any of the embodiments described herein is provided.
  • a carrier comprising the aforementioned computer program product is provided. The carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium (e.g., a non-transitory computer readable medium such as memory).
  • FIG 10 is a schematic block diagram of the radio access node 800 according to some other embodiments of the present disclosure.
  • the radio access node 800 includes one or more modules 1000, each of which is implemented in software.
  • the module(s) 1000 provide the functionality of the radio access node 800 described herein. This discussion is equally applicable to the processing node 900 of Figure 9 where the modules 1000 may be implemented at one of the processing nodes 900 or distributed across multiple processing nodes 900 and/or distributed across the processing node(s) 900 and the control system 802.
  • FIG 11 is a schematic block diagram of a wireless communication device 1100 according to some embodiments of the present disclosure.
  • the wireless communication device 1100 includes one or more processors 1102 (e.g., CPUs, ASICs, FPGAs, and/or the like), memory 1104, and one or more transceivers 1106 each including one or more transmitters 1108 and one or more receivers 1110 coupled to one or more antennas 1112.
  • the transceiver(s) 1106 includes radio-front end circuitry connected to the antenna(s) 1112 that is configured to condition signals communicated between the antenna(s) 1112 and the processor(s) 1102, as will be appreciated by on of ordinary skill in the art.
  • the processors 1102 are also referred to herein as processing circuitry.
  • the transceivers 1106 are also referred to herein as radio circuitry.
  • the functionality of the wireless communication device 1100 described above may be fully or partially implemented in software that is, e.g., stored in the memory 1104 and executed by the processor(s) 1102.
  • the wireless communication device 1100 may include additional components not illustrated in Figure 11 such as, e.g., one or more user interface components (e.g., an input/output interface including a display, buttons, a touch screen, a microphone, a speaker(s), and/or the like and/or any other components for allowing input of information into the wireless communication device 1100 and/or allowing output of information from the wireless communication device 1100), a power supply (e.g., a battery and associated power circuitry), etc.
  • user interface components e.g., an input/output interface including a display, buttons, a touch screen, a microphone, a speaker(s), and/or the like and/or any other components for allowing input of information into the wireless communication device 1100 and/or allowing output of information from the wireless communication device 1100
  • a power supply e.g., a battery and associated power circuitry
  • a computer program including instructions which, when executed by at least one processor, causes the at least one processor to carry out the functionality of the wireless communication device 1100 according to any of the embodiments described herein is provided.
  • a carrier comprising the aforementioned computer program product is provided.
  • the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium (e.g., a non-transitory computer readable medium such as memory).
  • FIG 12 is a schematic block diagram of the wireless communication device 1100 according to some other embodiments of the present disclosure.
  • the wireless communication device 1100 includes one or more modules 1200, each of which is implemented in software.
  • the module(s) 1200 provide the functionality of the wireless communication device 1100 described herein.
  • any appropriate steps, methods, features, functions, or benefits disclosed herein may be performed through one or more functional units or modules of one or more virtual apparatuses.
  • Each virtual apparatus may comprise a number of these functional units.
  • These functional units may be implemented via processing circuitry, which may include one or more microprocessor or microcontrollers, as well as other digital hardware, which may include Digital Signal Processors (DSPs), special-purpose digital logic, and the like.
  • the processing circuitry may be configured to execute program code stored in memory, which may include one or several types of memory such as Read Only Memory (ROM), Random Access Memory (RAM), cache memory, flash memory devices, optical storage devices, etc.
  • Program code stored in memory includes program instructions for executing one or more telecommunications and/or data communications protocols as well as instructions for carrying out one or more of the techniques described herein.
  • the processing circuitry may be used to cause the respective functional unit to perform corresponding functions according one or more embodiments of the present disclosure.
  • E-UTRA Evolved Universal Terrestrial Radio Access

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Abstract

Divers modes de réalisation décrits dans la présente divulgation concernent un mécanisme de repli de formation de faisceau à deux étages pour la formation de faisceau basée sur livre de codes dans un système d'antenne active (AAS). Dans un mode de réalisation, un rapport d'indicateur de matrice de précodage (PMI) et un rapport d'indicateur de ressource de signal de synchronisation/canal de diffusion physique (SSBRI) sont reçus au niveau d'une station de base à partir d'un dispositif d'équipement utilisateur (UE). La station de base valide le PMI et le SSBRI dans le rapport PMI et le rapport SSBRI et, si le PMI et le SSBRI sont valides, la station de base effectue une formation de faisceau spécifique à l'UE (UDF) basée sur PMI pour une communication à l'UE. Si le PMI est invalide, mais le SSBRI est valide, la station de base effectue une formation de faisceau spécifique au sous-secteur (SBF) basée sur SSBRI pour une communication à l'UE. Si le SSBRI est invalide, la station de base effectue une formation de faisceau spécifique à une cellule (CBF) pour une communication à l'UE.
PCT/IB2022/060355 2022-10-27 2022-10-27 Mécanisme de repli pour formation de faisceau basée sur livre de codes dans un aas WO2024089450A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220095125A1 (en) * 2019-06-06 2022-03-24 Huawei Technologies Co., Ltd. Secondary Cell Activation Method and Apparatus
US20220095254A1 (en) * 2020-09-22 2022-03-24 Samsung Electronics Co., Ltd. Method and apparatus for beam measurement, reporting and indication
US20220330067A1 (en) * 2021-04-08 2022-10-13 Qualcomm Incorporated Channel state information feedback in wireless communication

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220095125A1 (en) * 2019-06-06 2022-03-24 Huawei Technologies Co., Ltd. Secondary Cell Activation Method and Apparatus
US20220095254A1 (en) * 2020-09-22 2022-03-24 Samsung Electronics Co., Ltd. Method and apparatus for beam measurement, reporting and indication
US20220330067A1 (en) * 2021-04-08 2022-10-13 Qualcomm Incorporated Channel state information feedback in wireless communication

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