WO2015063372A1 - Procédés et appareil de mesure de conditions de réseau - Google Patents

Procédés et appareil de mesure de conditions de réseau Download PDF

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Publication number
WO2015063372A1
WO2015063372A1 PCT/FI2014/050815 FI2014050815W WO2015063372A1 WO 2015063372 A1 WO2015063372 A1 WO 2015063372A1 FI 2014050815 W FI2014050815 W FI 2014050815W WO 2015063372 A1 WO2015063372 A1 WO 2015063372A1
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WO
WIPO (PCT)
Prior art keywords
metric
user device
reference signal
base station
rsrq
Prior art date
Application number
PCT/FI2014/050815
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English (en)
Inventor
Lars Dalsgaard
Jorma Johannes Kaikkonen
Sari Kaarina Nielsen
Original Assignee
Nokia Technologies 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 Technologies Oy filed Critical Nokia Technologies Oy
Publication of WO2015063372A1 publication Critical patent/WO2015063372A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences

Definitions

  • the present invention relates generally to wireless communication. More particularly, the invention relates to improved systems and techniques for measurement of characteristics elating to network conditions. DEFINITION OF ABBREVIATIONS:
  • RSRQ reference signal received quality
  • Base stations coordinate activities such as connection and handoffs based on network conditions experienced by user devices.
  • a user device transmits a reference signal received quality (RSRQ) metric to a base station, and the base station can make decisions based on the RSRQ metric.
  • RSRQ reference signal received quality
  • elCIC enhanced inter-cell interference coordination
  • user devices may use an RSRQ metric adapted to elCIC operation.
  • RSRQ metric adapted to elCIC operation.
  • User devices that use the RSRQ metric adapted to elCIC are being introduced more and more, but many user devices use an RSRQ metric that is not specifically adapted to elCIC operation.
  • Legacy and elCIC RSRQ metrics are discussed, for example, in 3 GPP technical specification (TS) 36.214.
  • the legacy metric is based on measuring a received signal strength indicator (RSSI) component from orthogonal frequency division multiplexing (OFDM) signals which contain the call-specific reference signal (CRS).
  • RSSI received signal strength indicator
  • OFDM orthogonal frequency division multiplexing
  • the metric adapted to elCIC cases is based on measuring the RSSI component from all symbols in a subframe.
  • the effects of differences between metrics can be seen, for example, in the number of handovers, ping pong effect between cells, radio link failures, and so forth.
  • a method comprises controlling a user device to interpret a metric selection command from a base station specifying whether a first or a second reference signal receive quality (RSRQ) metric supported by the user device is to be used in making RSRQ measurements, selecting the first or the second metric based on the metric selection command, and using the selected metric to perform RSRQ measurements.
  • RSRQ reference signal receive quality
  • a method comprises controlling a base station to send a metric selection command to a user device specifying a reference signal receive quality (RSRQ) metric to be used by a user device for making reference signal receive quality measurements in evaluating network conditions, and interpreting a reference signal received quality (RSRQ) report received from the user device based on a confirmation, or a failure to receive a confirmation, from the user device.
  • RSRQ reference signal receive quality
  • an apparatus comprises means for controlling a user device to interpret a metric selection command from a base station specifying whether a first or a second reference signal receive quality (RSRQ) metric supported by the user device is to be used in making RSRQ measurements, means for selecting the first or the second metric based on the metric selection command, and means for using the selected metric to perform RSRQ measurements.
  • RSSI reference signal receive quality
  • a method comprises means for controlling a base station to send a metric selection command to a user device specifying a reference signal receive quality (RSRQ) metric to be used by a user device for making reference signal receive quality measurements in evaluating network conditions, and means for interpreting a reference signal received quality (RSRQ) report received from the user device based on a confirmation, or a failure to receive a confirmation, from the user device.
  • RSRQ reference signal receive quality
  • an apparatus comprises at least one processor and memory storing a program of instructions.
  • the memory storing the program of instructions is configured to, with the at least one processor, cause the apparatus to at least control a user device to interpret a metric selection command from a base station specifying whether a first or a second reference signal receive quality (RSRQ) metric supported by the user device is to be used in making RSRQ measurements, select the first or the second metric based on the metric selection command, and use the selected metric to perform RSRQ measurements.
  • RSRQ reference signal receive quality
  • an apparatus comprises at least one processor and memory storing a program of instructions.
  • the memory storing the program of instructions is configured to, with the at least one processor, cause the apparatus to at least control a base station to send a metric selection command to a user device specifying a reference signal receive quality (RSRQ) metric to be used by a user device for making reference signal receive quality measurements in evaluating network conditions, and interpret a reference signal received quality (RSRQ) report received from the user device based on a confirmation, or a failure to receive a confirmation, from the user device.
  • RSSQ reference signal receive quality
  • a computer readable medium stores a program of instructions. Execution of the program of instructions by at least one processor configures an apparatus to at least control a user device to interpret a metric selection command from a base station specifying whether a first or a second reference signal receive quality (RSRQ) metric supported by the user device is to be used in making RSRQ measurements, select the first or the second metric based on the metric selection command, and use the selected metric to perform RSRQ measurements.
  • RSRQ reference signal receive quality
  • a computer readable medium stores a program of instructions. Execution of the program of instructions by at least one processor configures an apparatus to at least control a base station to send a metric selection command to a user device specifying a reference signal receive quality (RSRQ) metric to be used by a user device for making reference signal receive quality measurements in evaluating network conditions, and interpret a reference signal received quality (RSRQ) report received from the user device based on a confirmation, or a failure to receive a confirmation, from the user device.
  • RSRQ reference signal receive quality
  • Fig. 1 illustrates a wireless network according to an embodiment of the present invention
  • Fig. 2 illustrates a process according to an embodiment of the present invention
  • Fig. 3 illustrates elements that can be used for carrying out embodiments of the present invention.
  • Embodiments of the present invention recognize that the different RSRQ metrics provide different information, and that the RSRQ metric received by a base station is likely to be misinterpreted if it is not aware which RSRQ metric is being used. It is likely to be very difficult for a network to control the UEs in the presence of two different RSRQ metrics with no way to distinguish them, and network complexity may be significantly increased to provide for proper control or, alternatively, UE behavior will be less predictable.
  • One or more embodiments of the present invention therefore, provide for a UE capable of supporting use of either a legacy RSRQ metric or an elCIC RSRQ metric, or both, with the UE being configurable (for example, by an instruction from the base station).
  • Configuration may direct the UE which metric to use for RSRQ measurements (the legacy metric, the elCIC metric, or both, and may alternatively or in addition direct the UE to report which metric is used.
  • MDT minimization of drive tests
  • Fig. 1 illustrates a wireless network 100 according to an embodiment of the present invention, comprising a macro base station, implemented as a macro evolved Node B (eNB) 102, defining a macro cell 104, which is the area served by the macro eNB 102. Within the area of the macro cell 104 are deployed small eNBs 106A-106C, defining small cells 108A-108C.
  • the network 100 serves UEs 110A-110E, each of which provides RSRQ reports to its serving base station.
  • the UEs 11 OA- HOC are able to use either available RSRQ metric (either the legacy RSRQ metric or the elCIC metric), and the UEs HOD and 110E are able to use only the legacy RSRQ metric.
  • each eNB is able to direct a UE to use one RSRQ metric or the other, and in addition, in one or more embodiments of the invention, the UEs 11 OA- HOC, in response to receiving a direction from an eNB, send a confirmation acknowledging the direction received from the eNB.
  • the UEs HOD and 110E will not understand, and therefore will not confirm, the direction from an eNB, so that the eNB sending the direction will recognize that these UEs are not able to switch between the legacy and the elCIC metrics and will also recognize (because UEs using the elCIC networks are all understood to be configured to use one or both metrics as directed) that the UEs HOD and 110E will use only the legacy metric.
  • the network is able to optimize appropriate measurement parameters, such as L3 -filter parameters or event-triggered reporting criteria for the RSRQ measurement metric being used.
  • the eNB's identification of the UE as being capable or incapable of using the elCIC metric also allows it to set an appropriate metric for use during idle mode. For example, one or more of the UEs 11 OA- HOC may be directed to use the elCIC RSRQ metric, or both metrics, during idle mode, while the UEs HOD and 110E will be understood to be unable to use the elCIC metric.
  • eNBs, UEs, the MeasObjectEUTRA information element (presented in part below) defined for 3GPP networks may be configured to use an additional field.
  • MeasObjectEUTRA information element presented in part below
  • blackCellsToRemoveList CelllndexList OPTIONAL -- Need ON blackCellsToAddModList BlackCellsToAddModList OPTIONAL, -- Need ON cellForWhichToReportCGI PhysCellld OPTIONAL, -- Need ON
  • RSRQelCIC-Meas The additional field may suitably be called RSRQelCIC-Meas, defined as follows: RSRQelCIC-Meas
  • the UE shall, when performing RSRQ meeasurements, use all OFDM signals over the given measurement period for measuring RSSI in accordance with TS 36.133 and TS36.214.
  • the ReportConfigEUTRA information element 'triggerQuantity' parameter could be extended to include one or more additional enumerated values indicating which of the RSRQ modes should be used in evaluation.
  • the UE could indicate the measurement metric being used by adding a new field in 'VarLogMeasReport-rlO'.
  • a field in 'LogMeasInfo-rlO' may enable a network to distinguish which metric is being used and for which cell (the serving cell or a neighbor cell).
  • Fig. 2 illustrates a process according to an embodiment of the present invention.
  • an eNB transmits a signal requesting reference signal receive quality reporting from one or more UEs being served by the eNB.
  • the signal specifies the RSRQ metric to be used - either a legacy RSRQ metric or an elCIC RSRQ metric.
  • UEs capable of using either or both metrics confirm the specification of the metric, and UEs that are not capable of using the elCIC RSRQ metric do not confirm.
  • the UEs perform RSRQ measurement as directed or, if not able to respond to the direction, according to their capability, and report the eNB measurements.
  • the eNB evaluates the reports based on the metrics being used. Because the eNB has directed the metrics to be used, and receives confirmations from UEs capable of following the directions, it is able to identify the metric being used by each UE and interpret reports accordingly. At block 210, the eNB performs scheduling, handover, and other operations for each UE based at least in part on the RSRQ information reported by the UEs.
  • Fig. 3 illustrates details of an eNB (eNB) 300, and a user equipment (UE) 350.
  • the eNB 300 may suitably comprise a transmitter 302, receiver 304, and antenna 306.
  • the eNB 300 may also include a processor 308 and memory 310.
  • the eNB 300 may employ data 312 and programs (PROGS) 314, residing in memory 310.
  • PROGS data 312 and programs
  • the UE 350 may suitably comprise a transmitter 352, receiver 354, and antenna 356.
  • the UE 350 may also include a processor 358 and memory 360.
  • the UE 350 may employ data 362 and programs (PROGS) 364, residing in memory 360.
  • At least one of the PROGs 314 in the eNB 300 is assumed to include a set of program instructions that, when executed by the associated DP 308, enable the device to operate in accordance with the exemplary embodiments of this invention, as detailed above.
  • the exemplary embodiments of this invention may be implemented at least in part by computer software stored on the MEM 310, which is executable by the DP 308 of the eNB 300, or by hardware, or by a combination of tangibly stored software and hardware (and tangibly stored firmware).
  • at least one of the PROGs 364 in the UE 350 is assumed to include a set of program instructions that, when executed by the associated DP 358, enable the device to operate in accordance with the exemplary embodiments of this invention, as detailed above.
  • the exemplary embodiments of this invention may be implemented at least in part by computer software stored on the MEM 360, which is executable by the DP 358 of the UE 350, or by hardware, or by a combination of tangibly stored software and hardware (and tangibly stored firmware).
  • Electronic devices implementing these aspects of the invention need not be the entire devices as depicted at Figure 1 or Fig. 3 or may be one or more components of same such as the above described tangibly stored software, hardware, firmware and DP, or a system on a chip SOC or an application specific integrated circuit ASIC.
  • the various embodiments of the UE 350 can include, but are not limited to personal portable digital devices having wireless communication capabilities, including but not limited to cellular telephones, navigation devices, laptop/palmtop/tablet computers, digital cameras and music devices, and Internet appliances.
  • Various embodiments of the computer readable MEM 310 and 360 include any data storage technology type which is suitable to the local technical environment, including but not limited to semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, removable memory, disc memory, flash memory, DRAM, SRAM, EEPROM and the like.
  • Various embodiments of the DP 308 and 358 include but are not limited to general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and multi-core processors.
  • Mechanisms according to one or more embodiments of the present invention provide for (to take a few examples), better RSRQ metric for efficient offloading, increased measurement information available to the network, and an RSRQ metric that better and more precisely reflects load conditions.
  • an apparatus comprises at least one processor and memory storing a program of instructions.
  • the memory storing the program of instructions is configured, with the at least one processor, to cause the apparatus to at least control a user device to receive a metric selection command from a base station specifying a reference signal receive quality metric to be used for making reference signal receive quality measurements in evaluating network conditions, and, in response to the metric selection command, send to the base station a selection confirmation indicating the metric to be used.
  • the apparatus is further caused to select the metric to be used based on the metric selection command.
  • the reference signal receive quality metric is one of a legacy metric and an enhanced inter-cell interference coordination metric.
  • the metric selection command is included in a field in a MeasObjectEUTRA information element received from the base station.
  • a user device receiving the command will, when performing reference signal receive quality measurements, use all orthogonal frequency division multiplexing symbols over the given period for measuring a reference signal strength indicator.
  • the metric selection is based at least in part on a 'triggerQuantity' parameter in the ReportConfigEUTRA information element, wherein the 'triggerQuantity ' includes one or more enumerated values indicating which reference signal receive quality measurement metric should be used.
  • an apparatus comprises at least one processor and memory storing a program of instructions.
  • the memory storing the program of instructions is configured, with the at least one processor, to cause the apparatus to at least control a base station to send a metric selection command to a user device specifying a reference signal receive quality metric to be used for making reference signal receive quality measurements in evaluating network conditions, and interpret a reference signal received quality report received from the user device based on a confirmation, or a failure to receive a confirmation, from the user device.
  • the reference signal receive quality metric is one of a legacy metric and an enhanced inter-cell interference coordination metric.
  • failure by the base station to receive a confirmation indicates that the reference signal receive quality metric being used is a legacy metric.
  • the base station includes the metric selection command in a field in a MeasObjectEUTRA information element received from the base station.
  • the base station interprets the reference signal receive quality based at least in part on recognition of the metric used by the user device.
  • the base station makes decisions related to connection and handover based on this interpretation.
  • a method comprises controlling a user device to receive a metric selection command from a base station specifying a reference signal receive quality metric to be used for making reference signal receive quality measurements in evaluating network conditions, and, in response to the metric selection command, send to the base station a selection confirmation indicating the metric to be used.
  • a method comprises controlling a base station to send a metric selection command to a user device specifying a reference signal receive quality metric to be used for making reference signal receive quality measurements in evaluating network conditions, and interpret a reference signal received quality report received from the user device based on a confirmation, or a failure to receive a confirmation, from the user device.
  • a computer readable medium stores a program of instructions, execution of which by a processor configures an apparatus to at least control a user device to receive a metric selection command from a base station specifying a reference signal receive quality metric to be used for making reference signal receive quality measurements in evaluating network conditions, and, in response to the metric selection command, send to the base station a selection confirmation indicating the metric to be used.
  • a computer readable medium stores a program of instructions, execution of which by a processor configures an apparatus to at least control a base station to send a metric selection command to a user device specifying a reference signal receive quality metric to be used for making reference signal receive quality measurements in evaluating network conditions, and interpret a reference signal received quality report received from the user device based on a confirmation, or a failure to receive a confirmation, from the user device.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne des systèmes et des techniques permettant de sélectionner une mesure de qualité de réception de signal de référence (RSRQ) à utiliser par un dispositif d'utilisateur lors de mesures de RSRQ. Un dispositif d'utilisateur est commandé pour interpréter une instruction de sélection de mesure d'une station de base spécifiant si une première ou une seconde mesure de RSRQ prise en charge par le dispositif d'utilisateur doit être utilisée pour effectuer des mesures de RSRQ, sélectionne la première ou la seconde mesure sur la base de l'instruction de sélection de mesure et utilise la mesure sélectionnée pour effectuer des mesures de RSRQ. La première mesure peut être une mesure existante basée sur une mesure d'une composante indicatrice d'intensité de signal reçu (RSSI) de signaux de multiplexage par répartition orthogonale de fréquence (OFDM) qui contiennent le signal de référence spécifique à un appel (CRS), et la seconde mesure peut être une mesure de coordination d'interférences intercellulaires (eICIC) améliorée basée sur une mesure de la composante RSSI à partir de tous les symboles d'une sous-trame.
PCT/FI2014/050815 2013-11-04 2014-10-31 Procédés et appareil de mesure de conditions de réseau WO2015063372A1 (fr)

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US201361899503P 2013-11-04 2013-11-04
US61/899,503 2013-11-04

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WO2021244730A1 (fr) * 2020-06-01 2021-12-09 Telefonaktiebolaget Lm Ericsson (Publ) Rapport et configuration de mesure dans des réseaux de communication

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