WO2020242368A1 - Nœud de réseau, dispositif de communication et procédé de rapport de mesure - Google Patents

Nœud de réseau, dispositif de communication et procédé de rapport de mesure Download PDF

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Publication number
WO2020242368A1
WO2020242368A1 PCT/SE2020/050535 SE2020050535W WO2020242368A1 WO 2020242368 A1 WO2020242368 A1 WO 2020242368A1 SE 2020050535 W SE2020050535 W SE 2020050535W WO 2020242368 A1 WO2020242368 A1 WO 2020242368A1
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WIPO (PCT)
Prior art keywords
measurements
user equipment
measurement
network node
event condition
Prior art date
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PCT/SE2020/050535
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English (en)
Inventor
Pradeepa Ramachandra
Henrik RYDÈN
Lars Lindbom
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2020242368A1 publication Critical patent/WO2020242368A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0088—Scheduling hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters

Definitions

  • Embodiments herein relate to network nodes, user equipment and method therein.
  • a Universal Mobile Telecommunications System (UMTS) is a third generation (3G) telecommunication network, which evolved from the second generation (2G) Global
  • GSM Global System for Mobile Communications
  • EPS Evolved Packet System
  • 4G Fourth Generation
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • the wireless communication system may comprise one or more radio access network, where a radio access network 100, may also referred to as a network node, is shown with a user equipment (UE) 102, which communicates with one or multiple access nodes 103-104, using radio connections 107-108.
  • the access nodes 103-104 are connected to a core network node 106.
  • the access nodes 103-104 are part of radio access network 100.
  • “UE” is a non-limiting term which means any wireless communication terminal, wireless communication device, Machine Type Communication (MTC) device, Internet of Thing (loT) device, Device to Device (D2D) terminal, or node e.g. smart phone, laptop, mobile phone, sensor, relay, mobile tablets or even a small base station communicating within a cell.
  • MTC Machine Type Communication
  • LoT Internet of Thing
  • D2D Device to Device
  • node e.g. smart phone, laptop, mobile phone, sensor, relay, mobile tablets or even a small base station communicating within
  • the access nodes 103-104 corresponds typically to an Evolved NodeB (eNB) and the core network node 106 corresponds typically to either a Mobility Management Entity (MME) and/or a Serving Gateway (SGW).
  • eNB is part of the radio access network 100, which in this case is the E-UTRAN (Evolved Universal Terrestrial Radio Access Network), while the MME and SGW are both part of the EPC (Evolved Packet Core network).
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • EPC Evolved Packet Core network
  • the access nodes 103-104 corresponds typically to an 5G NodeB (gNB) and the core network node 106 corresponds typically to either a Access and Mobility Management Function (AMF) and/or a User Plane Function (UPF).
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • NG-RAN Next Generation Radio Access Network
  • AMF and UPF are both part of the 5G Core Network (5GC).
  • 5GC 5G Core Network
  • LTE eNBs can also be connected to the 5G-CN via NG-U/NG-C and support the Xn interface.
  • An eNB connected to 5GC is called a next generation eNB (ng-eNB) and is considered part of the NG-RAN.
  • LTE connected to 5GC will not be discussed further in this document; however, it should be noted that most of the solutions/features described for LTE and NR in this document also apply to LTE connected to 5GC. In this document, when the term LTE is used without further specification it refers to LTE-EPC
  • Radio Resource Control CONNECTED Mobility in Radio Resource Control CONNECTED (RRC_CONNECTED) state is also known as handover.
  • the purpose of handover is to move the UE 102, due to e.g. mobility, from a source access node 103, using a source radio connection 107, to a target access node 104, using a target radio connection 108.
  • the target radio connection 108 is associated with a target cell controlled by the target access node 104. So in other words, during a handover, the UE 102 moves from the source cell to a target cell.
  • An RRC_CONNECTED UE in E-UTRAN or NG-RAN can be configured by the network to perform measurements of serving and neighbor cells and based on the measurement reports sent by the UE, the network may decide to perform a handover of the UE to a neighbor cell. The network then sends a Handover Command message to the UE, for example, in LTE an RRCConnectionReconfiguration message with a field called mobilityControl Information and in NR an RRCRecon figuration message with a
  • the reconfiguration parameters provided by the target access node contains, for example, information needed by the UE to access the target access node, e.g., random access configuration, a new Cell Radio Network Temporary Identifier (C-RNTI) assigned by the target access node and security parameters enabling the UE to calculate new security keys associated to the target access node so the UE can send a Handover Complete message on Signalling Radio Bearer 1 (SRB1), encrypted and integrity protected, based on new security keys upon accessing the target access node.
  • C-RNTI Cell Radio Network Temporary Identifier
  • SRB1 Handover Complete message on Signalling Radio Bearer 1
  • Figure 2 shows a signaling flow between UE, source access node 103, also known as source gNB or source cell, and target access node 104, also known as target gNB or target cell, during a handover procedure, using 5G/NR as example.
  • Mobility in RRC_CONNECTED is Network-controlled as the network has best information regarding current situation such as load conditions, resources in different nodes, available frequencies, etc. Network can also take into account the impact from other UEs served by the network, e.g. from a resource allocation perspective.
  • Network prepares a target cell controlled by a target access node 104 before the UE accesses that access node.
  • Source access node 103 provides the UE with the RRC configuration to be used in the target cell, including SRB1 configuration to be used by the UE when sending the handover (HO) Complete message in the target cell.
  • UE is provided by the target access node with a new C-RNTI.
  • the UE 102 identifies itself by conveying the C-RNTI in Message 3 (MSG3) in the HO Complete message.
  • MSG3 Message 3
  • network provides the UE 102 with information how to access the target access node e.g. random access channel (RACH) configuration, so the UE 102 does not have to acquire System Information (SI) prior to the handover.
  • RACH random access channel
  • SI System Information
  • UE may be provided with contention-free random access (CFRA) resources, i.e. in that case the target access node 104 identifies the UE from the preamble in MSG1.
  • CFRA contention-free random access
  • Security is prepared before the UE accesses the target cell controlled by the target access node i.e. keys must be refreshed before sending the encrypted and integrity protected HO Complete message, in LTE the RRC Connection Reconfiguration Complete message, so that the UE can be verified by the target access node. . Both full and delta reconfiguration are supported so that the HO command can be minimized.
  • the UE can be configured with periodical reporting configurations and/or event triggered reporting configurations (A1-A6 and B1-B2).
  • the Information Element (IE) ReportConfigNR specifies criteria for triggering of an NR measurement reporting event. Measurement reporting events are based on cell measurement results, which can either be derived based on Synchronization Signal/ Physical Broadcast Channel (SS/PBCH) block or Channel State Information Reference Signal (CSI-RS). These events are labelled AN with N equal to 1 , 2 and so on.
  • SS/PBCH Synchronization Signal/ Physical Broadcast Channel
  • CSI-RS Channel State Information Reference Signal
  • Event A1 Serving becomes better than absolute threshold
  • Event A2 Serving becomes worse than absolute threshold
  • Event A3 Neighbour becomes amount of offset better than PCell/PSCell
  • Event A4 Neighbour becomes better than absolute threshold
  • Neighbour/SCell becomes better than another absolute threshold2.
  • Event A6 Neighbour becomes amount of offset better than SCell.
  • Machine learning can be used to find a predictive function for a given dataset; the dataset is typically a mapping between a given input to an output.
  • the predictive function or mapping function is generated in a training phase, where the training phase assumes knowledge of both the input and output.
  • the test phase comprises predicting the output for a given input.
  • Applications of machine learning are for example curve fitting, facial recognition and spam filter.
  • Figure 3 shows an example of one type of machine learning, namely classification, where the task is to train a predictive function that separates the two classes, circle and cross class.
  • feature 1 and 2 provides low separation of the output class, hence leading to a worse prediction performance in comparison with Figure 3 b), where using feature 3 and 4 enables a better separation and classifying performance.
  • the performance of the machine learner is proportional to the correlation between the input and the output, one key problem in machine learning is to find or create good features, another problem is to collect enough data samples.
  • Machine learning algorithms to be developed by the network nodes are largely dependent on the measurement report sent by the UE.
  • the network could configure:
  • Periodical reporting When the periodical reporting is configured, the UE sends the measurement report with a fixed periodicity. This will generally lead to a large over-the-air reporting overhead.
  • Event triggered reporting is used mainly for handover, load balancing related actions via handover or carrier aggregation and also for triggering inter-frequency measurements etc.
  • the UE sends the measurement report, upon fulfilling the event entering condition for Time-To-Trigger duration.
  • the measurement reporting is triggered in poor radio conditions and if the measurement report size is large, including serving cells’ measurements, beam measurements and measurements associated to best neighbors on serving frequencies etc., then there is a risk of failing to send the measurement report in the Up Link (UL). Therefore, certain coverage edge related event triggered reporting configurations are not large in report size, e.g., by not including beam measurements, by not including other serving cell measurements or the best neighbor in serving frequencies related
  • the object is achieved by a user equipment and method performed therein for performing measurement reporting in a wireless communication network.
  • the user equipment receives a measurement configuration message from a first network node.
  • the measurement configuration message comprises a first and second event condition configurations.
  • the user equipment checks if a first event condition is fulfilled and logs measurements if a first event condition is fulfilled.
  • the user equipment checks if a second event condition is fulfilled and sends the logged measurements to the first network node (103) if a second event condition is fulfilled.
  • the object is achieved by a first network node and method performed therein for collecting measurement reports in a wireless communication network (100).
  • the first network node sends a measurement configuration message to a user equipment.
  • the measurement configuration message comprises a first and second event condition configurations.
  • the first network node obtains measurement report from the user equipment.
  • the measurement reporting framework comprises the following configurations:
  • the embodiments herein allow the network node to collect radio measurements in the poor radio regions without increasing the risk of UL failure from the UE due to large measurement reports.
  • the embodiments herein may be used as a tool for collecting radio measurements from cell edge for coverage and capacity optimization (CCO) via some machine learning (ML) functions.
  • CCO coverage and capacity optimization
  • ML machine learning
  • Figure 4 is a flow chart illustrating signaling between a network node and UE according to embodiments herein;
  • Figure 5 is a flow chart illustrating signaling between a network node and UE according to another embodiment herein.
  • Figure 6 is a schematic block diagram illustrating one embodiment of a UE/network node. DETAILED DESCRIPTION
  • a method performed in a network node and a UE will be described with reference to Figure 4.
  • the method comprises the following actions or steps, which actions may be performed in any suitable order.
  • the network node 103 sends a measurement configuration message.
  • the UE 102 receives the measurement configuration message from the network node 103.
  • the measurement configuration sent from the network node comprises two event
  • Event ML1 special Cell (SpCell) becomes worse than thresholdl for logging and SpCell becomes better than threshold2 for reporting, where SpCell refers to an NR cell that is either acting as Primary Cell (PCell) with Master Node (MN) or Primary Secondary Cell (PSCell) with Secondary Node (SN).
  • MN is a radio access node that provides the control plane connection to the core network
  • SN is a radio access node with no control plane connection to the core network.
  • the UE shall: 1 > consider the entering condition for logging the measurement for this event to be satisfied when condition ML1-1 , as specified below, are fulfilled;
  • Mp is the measurement result of the NR SpCell, not taking into account any offsets.
  • Hys1 and Hys2 is the hysteresis parameter for this event, i.e. hysteresis as defined within reportConfigNR for this event.
  • Thresh1 is the threshold parameter for this event, i.e. ML1-Threshold1 as defined within reportConfigNR for this event.
  • Thresh2 is the threshold parameter for this event, i.e. ML1-Threshold2 as defined within reportConfigNR for this event.
  • Mp is expressed in dBm in case of reference signal received power (RSRP), or in dB in case of Reference Signal Received Quality (RSRQ) and Reference Signal to Interference & Noise Ratio (RS-SINR).
  • RSRP reference signal received power
  • RSRQ Reference Signal Received Quality
  • RS-SINR Reference Signal to Interference & Noise Ratio
  • Hys is expressed in dB.
  • Thresh1 is expressed in the same unit as Mp.
  • Thresh2 is expressed in the same unit as Mp.
  • only serving cell measurement-based event configuration is provided.
  • the invention is not limited to only serving cell measurements. It can be based on only neighbour cell measurements and/or based on both serving and neighbour cell measurements.
  • the event configuration may be based on one or more of the measurement quantities like RSRP or RSRQ or SINR.
  • Hys1 and Hys2 are configured to 5 dB
  • Threshl is configured to be -110 dBm
  • Thresh2 is configured to be -95 dBm.
  • the UE will then start logging of measurements when the SpCell RSRP is less than -115.1 dBm, as (-115.1+5) ⁇ -110.
  • the UE keeps collecting these measurements until the SpCell RSRP is better than -104.9dBm, as (-104.9-5)>-110.
  • Action 401 Check if measurement logging event condition is fulfilled
  • the UE 102 fulfils the inequality condition ML1-1 provided in the previous sub section.
  • This condition may be based on RSRP or RSRQ or SINR or a combination of these measurements.
  • This condition may also be based on the Synchronization Signal Block (SSB) or CSI-RS or a combination of these reference signal types.
  • SSB Synchronization Signal Block
  • Action 402 UE 102 performs logging of the measurements
  • the UE 102 may be configured with what measurements to be reported. This may be provided via reportAddNeighMeas , reportQuantityCell and reportQuantityRS-lndexes or some new parameters in the reportConfig. An example of the new parameters could be associated whether the UE is expected to log the serving cell measurements or not. Other examples include timing advance measurements, location information etc.
  • the network node may also provide logginglnterval and loggingAmount.
  • the logginglnterval provides the periodicity with which the UE shall log the measurements when the event ML1-1 is satisfied and the loggingAmount provides the maximum number of logged samples to be logged by the UE 102.
  • Action 403 Check if measurement reporting event condition is fulfilled
  • the UE 102 fulfils the inequality condition ML1-2 provided in the previous sub section.
  • This condition may be based on RSRP or RSRQ or SINR or a combination of these measurements.
  • This condition may also be based on the SSB or CSI-RS or a combination of these reference signal types.
  • the UE 102 shall send a measurement report to the serving cell.
  • the UE 102 upon logging up to loggingAmount number of measurement samples, the UE 102 shall stop logging the measurements and wait for the condition ML1- 2 to be fulfilled so that the logged measurements can be reported. In some other embodiments, upon logging up to loggingAmount number of measurement samples, the UE 102 shall stop logging the measurements and informs the network node 103 about the fulfilment of the loggingAmount number of measurement samples so that the network node 103 can either fetch the measurements from the UE despite the risk of failed UL transmissions or the network node 103 may handover the UE 102 to another network node, e.g. the second network node 104, where the radio quality can be better and hence can fetch the measurements from the UE 102. The first network node 102 can then fetche the measurements from the user equipment (102) via signalling with the second network node 104. The second node 104 will request for the UE measurements.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1 :
  • the UE 102 upon the fulfilment of the first event in Action 501 , shall send a measurement report to the network node 103 to indicate the fulfilment of the event entering configuration. Only a subset of the measurement report contents is sent to the network node 103 in Action 502, i.e. a light-weight measurement report.
  • the measurement configuration in Action 500 includes the two event configurations and also what shall be reported as part of the light-weight measurement report and a detailed measurement report.
  • the detailed logged report is sent to the network node 103, in Action 505.
  • the network node 103 may configure two different reporting quantities.
  • the network node 103 may provide reportAddNeighMeasl , reportQuantityCelH and reportQuantityRS-lndexesl or some new parameters in the reportConfig.
  • the network node 103 may provide reportAddNeighMeas2, reportQuantityCell2 and reportQuantityRS- Indexes2 or some new parameters in the same reportConfig.
  • Embodiment 2 Embodiment 2:
  • the UE 102 behaviors upon handing over the UE 102 or when the UE 102 performs a state transition after the first event and before the second event is specified.
  • the UE 102 discards the logged measurements b.
  • the handover command contains a configuration as to whether the UE 102 shall retain these measurements, or the UE 102 shall discard these measurements. If the UE 102 retains these measurements, then there may be additional configuration as to whether the UE 102 shall continue to log these
  • the configuration could further involve when the UE 102 may send the measurement report.
  • the UE 102 Upon state transition from RRC connected to RRC idle/RRC inactive a. In one embodiment, the UE 102 discards the logged measurements b. In another embodiment, the RRC release message contains a configuration as to whether the UE 102 shall retain these measurements, or the UE shall discard these measurements. If the UE retains these measurements, then there may be additional configuration as to whether the UE 102 shall continue to log these measurements or whether the UE 102 shall suspend these measurements.
  • the UE 102/network node 103 comprises modules as shown in Figure 6.
  • the UE 102 /network node 103 comprises a receiving module 610, a transmitting module 620, a determining module 630, a processing module 640, a memory 650 etc.
  • the receiving module 610, transmitting module 620, determining module 630 and processing module 640 may be combined as one module, shown as processor 660.
  • the method according to embodiments herein may be implemented through one or more processors, such as the processor 660 in the UE 102/network node 103 together with computer program code for performing the functions and actions of the embodiments herein.
  • the program code mentioned above may also be provided as a computer program product, for instance in the form of a data carrier 680 carrying computer program code 670, as shown in Figure 6, for performing the embodiments herein when being loaded into the UE 102/network node 103.
  • One such carrier may be in the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick.
  • the computer program code may furthermore be provided as pure program code on a server or a cloud and downloaded to the U E/network node.
  • the memory 650 in the UE 102/network node 103 may comprise one or more memory units and may be arranged to be used to store received information, measurements, data, configurations and applications to perform the method herein when being executed in the UE 102/network node 103.

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

Abstract

Des modes de réalisation de la présente invention concernent un cadre de rapport de mesure pour UE en mode connecté RRC qui comprend les configurations suivantes : une première configuration d'événement selon laquelle l'UE doit commencer à journaliser les mesures ; une seconde configuration d'événement selon laquelle l'UE doit envoyer le rapport de mesure fourni dans la mesure où il dispose de mesures journalisées disponibles sur la base du premier événement.
PCT/SE2020/050535 2019-05-27 2020-05-27 Nœud de réseau, dispositif de communication et procédé de rapport de mesure WO2020242368A1 (fr)

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CN114666858A (zh) * 2022-04-28 2022-06-24 北京小米移动软件有限公司 网络注册方法、装置、终端及存储介质
WO2023020384A1 (fr) * 2021-08-16 2023-02-23 维沃移动通信有限公司 Procédé et dispositif de traitement d'informations, et terminal
WO2024027296A1 (fr) * 2022-08-01 2024-02-08 大唐移动通信设备有限公司 Procédé de rapport de mesure, terminal, et dispositif de réseau

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WO2023020384A1 (fr) * 2021-08-16 2023-02-23 维沃移动通信有限公司 Procédé et dispositif de traitement d'informations, et terminal
CN114666858A (zh) * 2022-04-28 2022-06-24 北京小米移动软件有限公司 网络注册方法、装置、终端及存储介质
CN114666858B (zh) * 2022-04-28 2024-04-02 北京小米移动软件有限公司 网络注册方法、装置、终端及存储介质
WO2024027296A1 (fr) * 2022-08-01 2024-02-08 大唐移动通信设备有限公司 Procédé de rapport de mesure, terminal, et dispositif de réseau

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