WO2020074636A1 - Auto-optimisation de sélection de faisceau - Google Patents

Auto-optimisation de sélection de faisceau Download PDF

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Publication number
WO2020074636A1
WO2020074636A1 PCT/EP2019/077468 EP2019077468W WO2020074636A1 WO 2020074636 A1 WO2020074636 A1 WO 2020074636A1 EP 2019077468 W EP2019077468 W EP 2019077468W WO 2020074636 A1 WO2020074636 A1 WO 2020074636A1
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WO
WIPO (PCT)
Prior art keywords
related index
beam related
index
access procedure
indication
Prior art date
Application number
PCT/EP2019/077468
Other languages
English (en)
Inventor
Aby KANNEATH ABRAHAM
Original Assignee
Nokia Solutions And Networks 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 Solutions And Networks Oy filed Critical Nokia Solutions And Networks Oy
Publication of WO2020074636A1 publication Critical patent/WO2020074636A1/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
    • H04B7/0686—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
    • 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
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure

Definitions

  • the present invention relates to self-optimization in case of beam-forming.
  • the 5G NR may rely on highly-directional transmissions (beams) to overcome the large pathloss, and the use of directional transmissions significantly complicates initial access.
  • the mmWave initial access procedure may provide a mechanism by which both the UE and the base station (BS) can determine suitable beamforming (BF) directions on which subsequent directional communication can be carried out.
  • BS base station
  • BF beamforming
  • Random access procedures In wireless technologies like LTE or 5G, devices use random access procedures when they are not uplink synchronized with the network or when they do not have UL resources random access procedures may be used during a number of scenarios like initial access to the network, UL data arrival, handover etc. Random access can be contention free or contention based. Except when the network explicitly signals the random-access resources, contention-based RACH is used.
  • UE --> NW RACH Preamble (RA-RNTI, indication for L2/L3 message size)
  • UE ⁇ -- NW Random Access Response (Timing Advance, T_C-RNTI, UL grant for L2/L3 message)
  • UE ⁇ NW RACH Preamble (PRACH) Assignment
  • UE --> NW RACH Preamble (RA-RNTI, indication for L2/L3 message size)
  • UE ⁇ --NW Random Access Response (Timing Advance, C-RNTI, UL grant for L2/L3 message)
  • UE For NR is operating in beamforming mode, UE detects and selects a best beam for RACH process. This beam selection process is a fundamental difference between LTE RACH and NR RACH process.
  • Beam switch will take place when (typically filtered, i.e. averaged in time domain) RSRP of a new beam is larger than RSRP of the source beam by a certain threshold.
  • the threshold means that for certain time, the UE may not be with the best beam and there could be even a chance for beam failure.
  • 5G-UE starts Beam Recovery by sending Random Access Preamble on a best target beam.
  • Beam selection during RACH, for initial access or even for beam failure recovery by the UE is governed by the parameters set by the gNB and broadcasted in system information.
  • the detailed description of the actions and parameters is present in the NR MAC specifications (3GPP TS 38.321 ).
  • NR RRC configures various parameters like the below mentioned ones with regards to the initial beam selection during the RACH process.
  • rsrp-ThresholdSSB an RSRP threshold for the selection of the SSB and corresponding random Access Preamble and/or PRACH occasion. If the random access procedure is initiated for beam failure recovery, rsrp-ThresholdSSB refers to rsrp-ThresholdSSB in BeamFailureRecoveryConfig IE;
  • rsrp-ThresholdCSI-RS an RSRP threshold for the selection of CSI-RS and corresponding random Access Preamble and/or PRACH occasion.
  • rsrp-ThresholdCSI-RS shall be set to a value calculated by multiplying rsrp-ThresholdSSB in BeamFailureRecoveryConfig IE by powerControlOffset as specified in 3GPP TS 38.214.
  • rsrp-ThresholdSSB-SUL an RSRP threshold for the selection between the NUL carrier and the SUL carrier;
  • powerControlOffset a power offset between rsrp-ThresholdSSB and rsrp- ThresholdCSI-RS to be used when the random access procedure is initiated for beam failure recovery.
  • ra-ResponseWindow the time window to monitor RA response(s) (SpCell only);
  • ra-ssb-OccasionMasklndex defines PRACH occasion(s) associated with an SSB in which the MAC entity may transmit a random-access Preamble (see subclause 7.4);
  • ra-OccasionList defines PRACH occasion(s) associated with a CSI-RS in which the MAC entity may transmit a random access Preamble
  • powerControlOffset a power offset between rsrp-ThresholdSSB and rsrp- ThresholdCSI-RS to be used when the random access procedure is initiated for beam failure recovery;
  • ssb-perRACH-OccasionAndCB-PreamblesPerSSB (SpCell only): defines the number of SSBs mapped to each PRACH occasion and the number of random access Preambles mapped to each SSB;
  • SON technology allows to collect and analyze various information elements, in particular information elements from the user devices, and to perform self-optimization, self-organization and self-healing in the telecommunication network.
  • a major use case for SON in current wireless technologies like LTE is optimization of random access parameters.
  • SON techniques are particularly useful for contention based RACH optimization because UE selects the random-access resources autonomously and in the absence of SON information send from the UE, there is no way for the network to know if the UE has faced any contention, or if the random access resources or parameters need to be optimized.
  • RACH report includes the below rach-Report-r9 SEQUENCE ⁇
  • a device sends RACH report to the eNodeB according to the below clause from the same specification 3GPP TS 36.331 , section 5.6.5.3:
  • an apparatus comprising means for monitoring configured to monitor if an access procedure to a beam of a cell fails, wherein a value of a beam related index is selected in the access procedure based on a measured quality of a beam parameter indexed by the beam related index; means for transmitting configured to transmit a failure indication comprising the selected value of the beam related index and an indication of the measured quality to the cell if the access procedure fails.
  • an apparatus comprising means for monitoring configured to monitor if a failure indication is received that an access procedure to a beam of a cell fails, wherein the failure indication comprises a beam related index and an indication of a measured quality of a beam parameter indexed by the beam related index; means for optimizing configured to optimize network parameters based on the received value of the beam related index and the quality indication if the failure indication is received.
  • a method comprising monitoring if an access procedure to a beam of a cell fails, wherein a value of a beam related index is selected in the access procedure based on a measured quality of a beam parameter indexed by the beam related index; transmitting a failure indication comprising the selected value of the beam related index and an indication of the measured quality to the cell if the access procedure fails.
  • a method comprising monitoring if a failure indication is received that an access procedure to a beam of a cell fails, wherein the failure indication comprises a beam related index and an indication of a measured quality of a beam parameter indexed by the beam related index; optimizing network parameters based on the received value of the beam related index and the quality indication if the failure indication is received.
  • Each of the methods of the third and fourth aspects may be a method of network optimization.
  • a computer program product comprising a set of instructions which, when executed on an apparatus, is configured to cause the apparatus to carry out the method according to any of the third and fourth aspects.
  • Fig. 1 shows a method according to an example embodiment of the invention
  • Fig. 2 shows a method performed by a terminal according to an example embodiment of the invention
  • Fig. 3 shows a method performed by a base station according to an example embodiment of the invention
  • Fig. 4 shows an apparatus according to an example embodiment of the invention
  • Fig. 5 shows a method according to an example embodiment of the invention
  • Fig. 6 shows an apparatus according to an example embodiment of the invention
  • Fig. 7 shows a method according to an example embodiment of the invention
  • Fig. 8 shows an apparatus according to an example embodiment of the invention.
  • Fig. 9 shows an example scenario on which example embodiments of the invention may be applied.
  • the apparatus is configured to perform the corresponding method, although in some cases only the apparatus or only the method are described.
  • FIG. 9 shows an example scenario on which example embodiments of the invention may be applied.
  • a gNB supports beamforming B1 and B2 represent two beams transmitted from the gNB.
  • gNB transmits different SS blocks in different predefined directions (beams) in regular time intervals.
  • SSBIocks corresponding to the B1 are indicated as bars of the arrow from gNB to UE.
  • SSBIocks corresponding to B2 are not shown.
  • the UE measures the RSRP corresponding to the SS blocks of the different beams and selects a suitable beam. Let us assume the UE has selected B1.
  • UE For Random Access, UE transmits the random access preambles allocated to B1 in the random access occasions provided for B1 .
  • operator may have allocated a same number of preambles for B1 and B2.
  • Case 1 If there are issues in the radio environment for B1 (e.g. due to non-optimal antenna tilting), there may be more random access failures in B1 , and UE may need to transmit with higher power for successful random access. According to some embodiments of the invention, UE reports the beam which was selected when the random access failed as well as the power of the SS block due to which B1 was selected for the failed random access attempt. Based on the inputs from the UE (and maybe further UEs which may face the same issue), gNB identifies that there is an issue with the radio environment for B1 and would adapt the antenna tilting.
  • Case 2 The number of UEs that select B1 for Random Access is much higher than the one's selecting B2 at a particular time period. Thus, there are more random access failures in B1 due to a lack of preambles. In the conventional system, UE will report that there was a collision, but gNB wouldn’t be able to identify on which beam it has occurred. But according to some embodiments of the invention, UE reports that the random access was failed in B1. Thus, gNB can allocate more preambles for B1 .
  • the information on failed SSB and/or CSI-RS is included in the RACH report sent from the UE to gNB.
  • NR RACH report to be specified in NR RRC specification 3GPP TS 38.331 is modified as below:
  • a device (terminal, UE) sends RACH report to the gNodeB according to the below clause from the same specification 3GPP TS 36.331 (amendments in bold italics):
  • gNB uses the received information on SSB index and/or CSI-RS index for optimising RACH parameters for beam related operations.
  • a method comprising the following steps is performed (see also the ladder diagram of Fig. 1 , which shows both the UE side and the gNB side according to some example embodiments of the invention):
  • a 5G UE which is capable of sending RACH reports to the network will:
  • only one of 1.a) and 1 .b) is executed.
  • TheGnb sends UE information request to the 5G device as in LTE with rach-ReportReq.
  • 5G UE sends the rach report including FailedSSB-lnfo and/or FailedCSI-RS-lnfo (if they are available) in UE information response.
  • gNB receives the FailedSSB-lnfo and/or FailedCSI-RS-lnfo in UE information response and utilises this information for RACH parameter optimisation.
  • UE stores the SSB index and/or SS-RSRP index for the last failed attempt and SS-RSRP/CSI-RSRP for the last failed attempt on a RACH failure. It includes this information (i.e., FailedSSB-lnfo and FailedCSI-RS-lnfo) in the RACH-report during UE information response and sends it to gNB. gNB uses this information for SON.
  • Fig. 2 shows the method according to some example embodiments of the invention performed at the UE side. In detail, Fig. 2 illustrates how the failedcsi-rs-info and failedssb-info are stored in NR UE during RACH failure. This information is reported back to the gNB in UE information response when a UE information request is received by the UE.
  • Fig. 3 shows the method according to some example embodiments of the invention performed at the gNB side. Compared to the SON-RACH LTE baseline, it involves receiving the new RACH optimisation parameters and perform self-optimisation using the same.
  • Fig. 4 shows an apparatus according to an example embodiment of the invention.
  • the apparatus may be a control unit which may be implemented in base station (e.g. gNB) or an element thereof.
  • Fig. 5 shows a method according to an example embodiment of the invention.
  • the apparatus according to Fig. 4 may perform the method of Fig. 5 but is not limited to this method.
  • the method of Fig. 5 may be performed by the apparatus of Fig. 4 but is not limited to being performed by this apparatus.
  • the apparatus comprises means for monitoring 10 and means for transmitting 20.
  • the means for monitoring 10 and means for transmitting 20 may be a monitoring means and transmitting means, respectively.
  • the means for monitoring 10 and means for transmitting 20 may be a monitor and a transmitter, respectively.
  • the means for monitoring 10 and means for transmitting 20 may be a monitoring processor and transmitting processor, respectively.
  • the means for monitoring 10 monitors if an access procedure to a beam of a cell fails (S10).
  • a value of a beam related index is selected based on a measured quality of a beam parameter.
  • the beam parameter is indexed by the beam related index.
  • the access procedure may be a random access procedure.
  • the means for transmitting 20 transmits a failure indication to the cell (S20).
  • the failure indication comprises the selected value of the beam related index and an indication of the measured quality.
  • Fig. 6 shows an apparatus according to an example embodiment of the invention.
  • the apparatus may be a control unit which may be implemented in a base station (e.g. gNB) or an element thereof.
  • Fig. 7 shows a method according to an example embodiment of the invention.
  • the apparatus according to Fig. 6 may perform the method of Fig. 7 but is not limited to this method.
  • the method of Fig. 7 may be performed by the apparatus of Fig. 6 but is not limited to being performed by this apparatus.
  • the apparatus comprises means for monitoring 1 10 and means for optimizing 120.
  • the means for monitoring 1 10 and means for optimizing 120 may be a monitoring means and optimizing means, respectively.
  • the means for monitoring 1 10 and means for optimizing 120 may be a monitor and a optimizer, respectively.
  • the means for monitoring 1 10 and means for optimizing 120 may be a monitoring processor and optimizing processor, respectively.
  • the means for monitoring 1 10 monitors if a failure indication is received (S1 10).
  • the failure indication indicates that an access procedure to a beam of a cell fails.
  • the failure indication comprises a beam related index and an indication of a measured quality of a beam parameter indexed by the beam related index.
  • the access procedure may be a random access procedure.
  • the means for optimizing 120 optimizes network parameters based on the received value of the beam related index and the quality indication (S120).
  • Fig. 8 shows an apparatus according to an example embodiment of the invention.
  • the apparatus comprises at least one processor 810, at least one memory 820 including computer program code, and the at least one processor 810, with the at least one memory 820 and the computer program code, being arranged to cause the apparatus to at least perform at least one of the methods according to Figs. 5 and 7.
  • the UE stores the SSB index and/or CSI-RS index (beam related index) before it transmits the same to the gNB on request.
  • the UE does not store the beam related index but transmits it immediately when the random access fails.
  • a frequency resource may be reserved for a contention- based transmission of the beam related index.
  • UE may transmit the beam related index without being requested by the gNB.
  • SSB index and CSI-RS index are examples of beam related indices and CSI and CSI-RS are examples of beam parameters (beam related signals).
  • CSI-RS is typically used for identifying the beam in RRC-Connected mode.
  • SSB-index is typically used for beam identification in RRC idle mode (and can be used for connected mode, too).
  • the term“beam related indices” may include other indices and the term“beam parameters” may include other parameters which are related to the beam.
  • RSRP is an example measurement value to determine the quality of the respective parameter.
  • other parameters such as RSRQ may be used instead of RSRP or in addition to RSRQ in order to determine the quality of the received beam parameter (beam related signal e.g. SSB, CSI-RS).
  • the term“storing along” means that one piece of information is stored such that its relation to the other piece of information may be obtained. E.g., these pieces of information may be stored in a same row of a table, or one after the other in a sequence of pairs of pieces of information.
  • 3GPP network e.g. NR
  • the invention is not limited to NR. It may be applied to any generation (3G, 4G, 5G, etc.) of 3GPP networks. However, the invention is not limited to 3GPP networks. It may be applied to other radio networks and wired networks with a random access procedure. Further, some example embodiments of the invention may be applied to any access procedure (such as an autonomous beam selection), wherein the access procedure may be or may not be different from a random access procedure.
  • a UE is an example of a terminal.
  • the terminal may be any device capable to connect to the radio network such as a MTC device, a D2X device etc.
  • a cell may be represented by the base station (e.g. gNB, eNB, etc.) serving the cell.
  • the base station (cell) may be connected to an antenna (array) serving the cell by a Remote Radio Head.
  • a base station may be realized as a combination of a central unit (one for plural base stations) and a distributed unit (one per base station). The central unit may be employed in the cloud.
  • One piece of information may be transmitted in one or plural messages from one entity to another entity. Each of these messages may comprise further (different) pieces of information.
  • Names of network elements, protocols, and methods are based on current standards. In other versions or other technologies, the names of these network elements and/or protocols and/or methods may be different, as long as they provide a corresponding functionality. If not otherwise stated or otherwise made clear from the context, the statement that two entities are different means that they perform different functions. It does not necessarily mean that they are based on different hardware. That is, each of the entities described in the present description may be based on a different hardware, or some or all of the entities may be based on the same hardware. It does not necessarily mean that they are based on different software. That is, each of the entities described in the present description may be based on different software, or some or all of the entities may be based on the same software. Each of the entities described in the present description may be embodied in the cloud.
  • example embodiments of the present invention provide, for example, a terminal (e.g. a UE or a MTC device), or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums carrying such computer program(s) and forming computer program product(s).
  • a base station e.g.
  • a gNB or eNB or a cell thereof, or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums carrying such computer program(s) and forming computer program product(s).
  • Implementations of any of the above described blocks, apparatuses, systems, techniques or methods include, as non-limiting examples, implementations as hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

Abstract

L'invention concerne un procédé comprenant les étapes consistant à : surveiller si une procédure d'accès à un faisceau d'une cellule échoue, une valeur d'un indice associé au faisceau étant sélectionnée dans la procédure d'accès sur la base d'une qualité mesurée d'un paramètre de faisceau indexé par l'indice associé au faisceau ; et, en cas d'échec de la procédure d'accès, transmettre à la cellule une indication d'échec contenant la valeur sélectionnée de l'indice associé au faisceau et une indication de la qualité mesurée. (Fig. 1)
PCT/EP2019/077468 2018-10-12 2019-10-10 Auto-optimisation de sélection de faisceau WO2020074636A1 (fr)

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IN201841038760 2018-10-12

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170346545A1 (en) * 2016-05-26 2017-11-30 Qualcomm Incorporated System and method for beam switching and reporting

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170346545A1 (en) * 2016-05-26 2017-11-30 Qualcomm Incorporated System and method for beam switching and reporting

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MEDIATEK INC: "Offline discussion summary on remaining issues on Beam Failure Recovery", vol. RAN WG1, no. Reno, USA; 20171127 - 20171201, 4 December 2017 (2017-12-04), XP051370777, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg%5Fran/WG1%5FRL1/TSGR1%5F91/Docs/> [retrieved on 20171204] *

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