EP2946603A1 - Déclencheur d'événement de compte-rendu robuste de mesure de réseaux hétérogènes - Google Patents

Déclencheur d'événement de compte-rendu robuste de mesure de réseaux hétérogènes

Info

Publication number
EP2946603A1
EP2946603A1 EP14700686.0A EP14700686A EP2946603A1 EP 2946603 A1 EP2946603 A1 EP 2946603A1 EP 14700686 A EP14700686 A EP 14700686A EP 2946603 A1 EP2946603 A1 EP 2946603A1
Authority
EP
European Patent Office
Prior art keywords
threshold
quantities
value
cell
measurement report
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP14700686.0A
Other languages
German (de)
English (en)
Inventor
Mikko SÄILY
Klaus Ingemann Pedersen
Per Henrik Michaelsen
Michael Guessregen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks Oy
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 EP2946603A1 publication Critical patent/EP2946603A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Definitions

  • Certain embodiments generally relate to wireless communication systems, such as, but not limited to, the Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN), Long Term Evolution (LTE) Evolved UTRAN (E-UTRAN), and/or LTE-Advanced (LTE-A).
  • UMTS Universal Mobile Telecommunications System
  • UTRAN Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • E-UTRAN Long Term Evolution-UTRAN
  • LTE-A LTE-Advanced
  • heterogeneous networks which may include any of the preceding networks, may benefit from a robust measurement report event trigger.
  • Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network refers to a communications network including base stations, or Node Bs, and for example radio network controllers (RNC).
  • UTRAN allows for connectivity between the user equipment (UE) and the core network.
  • the RNC provides control functionalities for one or more Node Bs.
  • the RNC and its corresponding Node Bs are called the Radio Network Subsystem (RNS).
  • RNS Radio Network Subsystem
  • E-UTRAN enhanced UTRAN
  • LTE Long Term Evolution
  • E-UTRAN refers to improvements of the UMTS through improved efficiency and services, lower costs, and use of new spectrum opportunities.
  • LTE is a 3rd generation partnership project (3GPP) standard that provides for uplink peak rates of at least 50 megabits per second (Mbps) and downlink peak rates of at least 100 Mbps.
  • 3GPP 3rd generation partnership project
  • LTE supports scalable carrier bandwidths from 20 MHz down to 1.4 MHz and supports both Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD).
  • Advantages of LTE are, for example, high throughput, low latency, FDD and TDD support in the same platform, an improved end-user experience, and a simple architecture resulting in low operating costs.
  • LTE-A LTE-Advanced
  • IMT- A international mobile telecommunications advanced
  • LTE-A LTE-Advanced
  • a goal of LTE-A is to provide significantly enhanced services by means of higher data rates and lower latency with reduced cost.
  • LTE-A will be a more optimized radio system fulfilling the international telecommunication union- radio (ITU-R) requirements for IMT-Advanced while keeping the backward compatibility.
  • ITU-R international telecommunication union- radio
  • Radio Resource Control (RRC)); Protocol specification, (Release 10), 5.5.4.6 Event A5 (PCell becomes worse than thresholdl and neighbor becomes better than threshold2)
  • UE is required to consider the entering condition for this event to be satisfied when both condition A5-1 and condition A5-2, as specified below, are fulfilled, and to consider the leaving condition for this event to be satisfied when condition A5-3 or condition A5-4, i.e., at least one of the two, as specified below, is fulfilled.
  • the cell(s) that triggers the event is on the frequency indicated in indicated in the associated measObject which may be different from the (primary) frequency used by the PCell.
  • Mp is the measurement result of the PCell, not taking into account any offsets.
  • Mn is the measurement result of the neighboring cell, not taking into account any offsets.
  • Ofn is the frequency specific offset of the frequency of the neighbor cell (i.e., offsetFreq as defined within measObjectEUTRA corresponding to the frequency of the neighbor cell).
  • Ocn is the cell specific offset of the neighbor cell (i.e., celllndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbor cell), and set to zero if not configured for the neighbor cell.
  • Hys is the hysteresis parameter for this event (i.e., hysteresis as defined within reportConfigEUTRA for this event).
  • Threshl is the threshold parameter for this event (i.e., a5-Threshold1 as defined within reportConfigEUTRA for this event).
  • Thresh2 is the threshold parameter for this event (i.e., A5-Threshold2 as defined within reportConfigEUTRA for this event).
  • Mn, Mp are expressed in dBm in case of RSRP, or in dB in case of RSRQ. Ofn, Ocn, Hys are expressed in dB.
  • Threshl is expressed in the same unit as Mp.
  • Thresh2 is expressed in the same unit as Mn.
  • the measurement report is required to include the layer 3 filtered measured results in accordance with the reportConfig for this measld, which should be ordered such that, if the measObject associated with this measld concerns E-UTRA, the measResult should be set to include the quantity/quantities indicated in the reportQuantity within the concerned reportConfig in order of decreasing triggerQuantity, i.e., the best cell is included first.
  • RRC Radio Resource Control
  • Protocol specification Protocol specification
  • the IE ReportConfigEUTRA includes the reporting configuration of the measurements to be performed by UE.
  • An example of ReportConfigEUTRA information element (TS 36.331 ) is shown in Figure 2.
  • the field descriptions of ReportConfigEUTRA information element is provided in Figure 3.
  • the IE ReportConfigEUTRA specifies criteria for triggering an E- UTRAN measurement reporting event.
  • both threshold 1 and threshold2 are assumed to be based on the same triggerQuantity, e.g., either RSRP or RSRQ. Therefore, for example, according to this conventional approach the UE is not able to trigger a measurement report when the serving cell RSRQ is worse than thresholdl and target RSRP is better than threshold2.
  • the RSRP-Range as trigger quantity for thresholdl and the RSRQ-Range for threshold2 from the ASN.1 CHOICE ThresholdEUTRA.
  • the ASN.1 BER Basic Encoding Rules
  • the decoder knows which quantity was encoded, because the tags of all alternatives in a choice are required to be distinct (ITU-T X.690 Specification of BER, Chp. 8.13).
  • the triggerQuantity configured in reportConfigEUTRA is then only used for the ordering criteria in MeasResultEUTRA.
  • Such a methodology may result in early/late handovers, handovers to a wrong cell, ping-pong handovers with a short time of stay in the target cell, increased signaling load and handover failures associated with small cells and fast moving users.
  • a method can include triggering a mobility event based on both a first threshold and a second threshold.
  • the method can also include expressing the first threshold in different units, quantities, or units and quantities from the second threshold.
  • an apparatus can include at least one processor and at least one memory including computer program code.
  • the at least one memory and the computer program code can be configured to, with the at least one processor, cause the apparatus at least to trigger a mobility event based on both a first threshold and a second threshold.
  • the at least one memory and the computer program code can also be configured to, with the at least one processor, cause the apparatus at least to express the first threshold in different units, quantities, or units and quantities from the second threshold.
  • An apparatus can include means for triggering a mobility event based on both a first threshold and a second threshold.
  • the apparatus can also include means for expressing the first threshold in different units, quantities, or units and quantities from the second threshold.
  • a non-transitory computer-readable medium can, in certain embodiments, be encoded with instructions that, when executed in hardware, perform a process.
  • the process can include the above-described method.
  • a computer program product can, according to certain embodiments, encode instructions for performing a process.
  • the process can include the above- described method.
  • Figure 1 illustrates RSRP and RSRQ for A5 trigger event quantity measurement.
  • Figure 2 illustrates an example of ReportConfigEUTRA information element of 3GPP TS 36.331.
  • Figure 3 illustrates field descriptions of ReportConfigEUTRA information element of 3GPP TS 36.331 .
  • Figure 4 illustrates a flow diagram of a method according to certain embodiments.
  • Figure 5a illustrates an apparatus according to an embodiment.
  • Figure 5b illustrates an apparatus according to another embodiment.
  • Multi-layer networks can also be referred to as heterogeneous networks ("HetNet").
  • HetNet heterogeneous networks
  • multilayer refers to cases with a mixture of macro base stations and small power base stations (e.g., pico and micro).
  • a multi-layer LTE network is used as an example for describing certain embodiments, although other embodiments could be applied to other cellular standards as well.
  • a macro-layer and a pico/micro layer may be implemented in a different radio access technology (RAT), for example, high speed packet access (HSPA) macro layer and LTE micro layer.
  • RAT radio access technology
  • Measurement reporting configuration can define how user equipment ("UE") will report the radio environment to a network.
  • a measurement report can act as an input to network mobility management in a connected mode.
  • 3GPP TS 36.331 is hereby incorporated herein by reference.
  • Mobility performance in the "RRC_Connected" state can be based on the UE measurements configured by the network.
  • the UE can perform the configured measurements.
  • the measurement report event trigger conditions are fulfilled, the UE can prepare a measurement report.
  • One example measurement report event trigger in HetNet is A5, which can trigger a measurement report when the serving cell is worse than thresholdl and the target is better than threshold2.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • Figure 1 illustrates RSRP and RSRQ for A5 trigger event quantity measurement.
  • UE can be located in proximity of small cells, and can experience radio conditions where the current macro cell connection is limited by RSRQ due to the interference coming from the small cell, and hence a mobility event may be needed.
  • the target cell In order to trigger a measurement report based on the A5 entry condition, the target cell also needs to be measured using the same RSRQ quantity, which needs to be better than threshold2.
  • the RSRQ measurement can be useful when detecting a poor radio condition, which is likely to cause a radio link failure.
  • a low value of RSRQ also implies that there is a high likelihood of a low value of signal to interference and noise ratio (SINR). Therefore, with low value of RSRQ there is a high probability that radio link failure detection has started (e.g. by T310 timer as specified by 3GPP TS 36.331 ). In such a case it is advantageous to try to connect to another cell.
  • SINR signal to interference and noise ratio
  • the main cause of decrease in RSRQ and SINR is the co-channel interfering signal received from the cell being approached. The level of interfering signal depends on the load in the target cell, which means that the RSRQ is a load- dependent measure.
  • the RSRQ is a good indicator of poor radio conditions in the serving cell, but it is not a good measure for target cell coverage.
  • the RSRP measurement of the target cell signal exceeding the given threshold is better indicator of having entered the coverage area of this cell.
  • the A5 measurement event can be used to detect when the radio conditions are poor in the serving cell, while UE is in the coverage area of another cell.
  • MSE mobility state estimation
  • certain embodiments provide a method and a device to, for example, optimize the UE measurements with independent event trigger quantity parameters for event triggers with multiple thresholds.
  • Event trigger A5 is used as an example, but also other measurements instances with multiple event trigger thresholds are possible.
  • Figure 4 illustrates a flow diagram of a method, according to certain embodiments.
  • the method can be used to optimize UE measurements with independent event trigger quantity parameters for event triggers with multiple thresholds.
  • event trigger A5 is simply one illustrative example.
  • the method can include an enhanced measurement configuration and reporting configuration, allowing definition of event trigger quantities for event trigger entry and leaving condition thresholds, where the event trigger quantities can represent measured signal power and/or quality.
  • the method can include expressing a first threshold using different units or quantities than a second threshold.
  • the method can also include, at 420, using existing ASN.1 Basic Encoding Rules for CHOICE type to indicate different quantities.
  • the event trigger specific parameters can be signaled to UE using the broadcasted System Information Blocks ("SIB").
  • SIB System Information Blocks
  • implementations can use existing ASN.1 types and encoding to indicate different quantities.
  • a first threshold such as Thresh 1
  • Thresh 2 can be expressed in different unit/quantity than a second threshold, such as Thresh2.
  • ReportConfigEUTRA field descriptions can be modified, such that the description for triggerQuantity indicates that in case an event has more than one threshold criteria (e.g. A5) the triggerQuantity is only used for the ordering in measResultEUTRA and the quantities used for evaluation of the triggering conditions are taken from choice ThresholdEUTRA for each threshold.
  • certain embodiments can improve the robustness of measurement reporting and provide more options for measurement configuration, especially in HetNet with co-channel intra-frequency deployments.
  • Certain embodiments can also improve the UE reporting accuracy and/or relevance of reporting, and can reduce the instances of early/late handovers, ping-pong handovers and handovers to a wrong cell. For fast moving users, certain embodiments can reduce the number of handovers with short time of stay in target cell and reduce handover failures associated with small cells. All these benefits can also contribute to reducing the signaling load as more robust measurement reporting in RRC connected state can be achieved.
  • Certain embodiments can be used to complement a "Gray-listing" approach for mobility performance optimization.
  • Gray- listing 3GPP RAN2 contribution “R2-124027, "Mobility State Estimation and HetNet” can be referenced, which is hereby incorporated by reference.
  • Certain embodiments can be used to complement the "HetNet mobility enhancements for LTE" Working Item Description "RP-122007” in 3GPP standardization body, where one of the objective is to standardize improvements to overall HO performance with regard to HO failure rate and ping-pong in HetNet environments, which is hereby incorporated by reference.
  • Enhanced measurement event triggers can be used to support mobility event optimization using both mobility state estimation and different source/target cell type characteristics.
  • the enhanced measurements can solve the problem related to diverse user mobility profiles, and parameters do not need to be a compromise between slowly moving and fast moving user profiles.
  • SON Self-Organizing networks
  • CEM customer experience management
  • FIG. 5a illustrates an example of an apparatus 10 according to an embodiment.
  • apparatus 10 may be a base station (BS), such as an eNB, or access point (AP).
  • BS base station
  • AP access point
  • apparatus 10 may include components or features not shown in Figure 5a. Only those components or features selected for illustration of certain embodiments are depicted in Figure 5a.
  • apparatus 10 includes a processor 22 for processing information and executing instructions or operations.
  • processor 22 may be any type of general or specific purpose processor. While a single processor 22 is shown in Figure 5a, multiple processors may be utilized according to other embodiments. In fact, processor 22 may include one or more of general- purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), and processors based on a multi-core processor architecture, as examples.
  • DSPs digital signal processors
  • FPGAs field-programmable gate arrays
  • ASICs application-specific integrated circuits
  • Apparatus 10 further includes a memory 14, which may be coupled to processor 22, for storing information and instructions that may be executed by processor 22.
  • Memory 14 may be one or more memories and of any type suitable to the local application environment, and may be implemented using any suitable volatile or nonvolatile data storage technology such as a semiconductor-based memory device, a magnetic memory device and system, an optical memory 5 device and system, fixed memory, and removable memory.
  • memory 14 can be comprised of any combination of random access memory (RAM), read only memory (ROM), static storage such as a magnetic or optical disk, or any other type of non-transitory machine or computer readable media.
  • the instructions stored in memory 14 may include program instructions or computer i o program code that, when executed by processor 22, enable the apparatus 10 to perform tasks as described herein.
  • Apparatus 10 may also include one or more antennas 25 for transmitting and receiving signals and/or data to and from apparatus 10.
  • Apparatus 10 may further include a transceiver 28 configured to transmit and
  • transceiver 28 may be configured to modulate information on to a carrier waveform for transmission by the antenna(s) 25 and demodulates information received via the antenna(s) 25 for further processing by other elements of apparatus 10.
  • transceiver 28 may be capable of transmitting and receiving signals or data directly.
  • Processor 22 may perform functions associated with the operation of apparatus 10 including, without limitation, precoding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of the apparatus 10, including processes related to management of communication resources.
  • memory 14 stores software modules that provide functionality when executed by processor 22.
  • the modules may include, for example, an operating system that provides operating system functionality for apparatus 10.
  • the memory may also store one or more functional modules, such as an application or program, to provide additional functionality for apparatus 10.
  • apparatus 10 may be implemented in hardware, or as any suitable combination of hardware and software.
  • apparatus 10 may be a BS or AP.
  • apparatus 10 may be controlled, by memory 14 and processor 22, to perform or cooperate with the method illustrated in Figure 35 4 or any of the methods described herein.
  • FIG 5b illustrates an example of an apparatus 20 according to another embodiment.
  • apparatus 20 may be network element. It should be noted that one of ordinary skill in the art would understand that apparatus 20 may include components or features not shown in Figure 5b. Only those components or features selected for illustration of certain embodiments are depicted in Figure 5b.
  • apparatus 20 includes a processor 32 for processing information and executing instructions or operations.
  • processor 32 may be any type of general or specific purpose processor. While a single processor 32 is shown in Figure 5b, multiple processors may be utilized according to other embodiments. In fact, processor 32 may include one or more of general- purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), and processors based on a multi-core processor architecture, as examples.
  • DSPs digital signal processors
  • FPGAs field-programmable gate arrays
  • ASICs application-specific integrated circuits
  • Apparatus 20 further includes a memory 34, which may be coupled to processor 32, for storing information and instructions that may be executed by processor 32.
  • Memory 34 may be one or more memories and of any type suitable to the local application environment, and may be implemented using any suitable volatile or nonvolatile data storage technology such as a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, fixed memory, and removable memory.
  • memory 34 can be comprised of any combination of random access memory (RAM), read only memory (ROM), static storage such as a magnetic or optical disk, or any other type of non-transitory machine or computer readable media.
  • the instructions stored in memory 34 may include program instructions or computer program code that, when executed by processor 32, enable the apparatus 20 to perform tasks as described herein.
  • Apparatus 20 may also include one or more antennas 35 for transmitting and receiving signals and/or data to and from apparatus 20.
  • Apparatus 20 may further include a transceiver 38 configured to transmit and receive information.
  • transceiver 38 may be configured to modulate information on to a carrier waveform for transmission by the antenna(s) 35 and demodulates information received via the antenna(s) 35 for further processing by other elements of apparatus 20.
  • transceiver 38 may be 5 capable of transmitting and receiving signals or data directly.
  • Processor 32 may perform functions associated with the operation of apparatus 20 including, without limitation, precoding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of the apparatus 20, i o including processes related to management of communication resources.
  • memory 34 stores software modules that provide functionality when executed by processor 32.
  • the modules may include, for example, an operating system that provides operating system functionality for apparatus 20.
  • the memory may also store one or more functional modules, such
  • apparatus 20 may be implemented in hardware, or as any suitable combination of hardware and software.
  • apparatus 20 may be a network element.
  • apparatus 20 may be controlled by 20 memory 34 and processor 32 to carry out or cooperate in the method described in Figure 4.
  • a method can include triggering a mobility event based on both a first threshold and a second threshold.
  • the method can also include expressing the first threshold in different units, quantities, or units 25 and quantities from the second threshold.
  • the method may further include using existing ASN.1 Basic Encoding Rules for CHOICE type to indicate different quantities.
  • an apparatus may include at least one processor and at least one memory including computer program code. The at least one
  • memory and the computer program code can be configured to, with the at least one processor, cause the apparatus at least to trigger a mobility event based on both a first threshold and a second threshold.
  • the at least one memory and the computer program code can also be configured to, with the at least one processor, cause the apparatus at least to express the first threshold in different units, quantities, or
  • the at least one memory and the computer program code can further be configured to, with the at least one processor, cause the apparatus at least to use existing ASN.1 Basic Encoding Rules for CHOICE type to indicate different quantities.
  • an apparatus can include means for triggering a mobility event based on both a first threshold and a second threshold.
  • the apparatus can also include means for expressing the first threshold in different units, quantities, or units and quantities from the second threshold.
  • the apparatus may further include means for using existing ASN.1 Basic Encoding Rules for CHOICE type to indicate different quantities.
  • a non-transitory computer-readable medium is, in certain embodiments, encoded with instructions that, when executed in hardware, perform a process.
  • the process can include triggering a mobility event based on both a first threshold and a second threshold.
  • the process can also include expressing the first threshold in different units, quantities, or units and quantities from the second threshold.
  • the process may further include using existing ASN.1 Basic Encoding Rules for CHOICE type to indicate different quantities.
  • E-UTRAN Evolved-Universal Terrestrial Radio Access Network
  • User Equipment for example, terminal

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

Abstract

La présente invention concerne un déclencheur d'événement de compte-rendu robuste de mesure de réseaux hétérogènes. Certains modes de réalisation se rapportent d'une manière générale à des systèmes de communication sans fil tels que, mais sans y être limités, les systèmes UTRAN, LTE, E-UTRAN et/ou LTE-A. Par exemple, des réseaux hétérogènes qui peuvent comprendre l'un quelconque des réseaux précédents peuvent bénéficier d'un déclencheur d'événement de compte-rendu robuste de mesure. Selon l'invention, ledit déclencheur d'événement de compte-rendu robuste de mesure peut être obtenu par des procédés, des appareils et des produits programmes informatiques destinés à optimiser des mesures d'équipement d'utilisateur au moyen de paramètres de quantité de déclenchement d'événement indépendants de déclencheurs d'événement ayant des seuils multiples. Un procédé peut faire appel à l'expression d'un premier seuil selon des unités/quantités différentes d'un second seuil. Le procédé peut en outre faire appel à l'utilisation des règles de codage de base compatibles ASN.1 existantes en tant que type de choix pour indiquer des quantités différentes.
EP14700686.0A 2013-01-18 2014-01-16 Déclencheur d'événement de compte-rendu robuste de mesure de réseaux hétérogènes Withdrawn EP2946603A1 (fr)

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