WO2014153756A1 - Mesure inter-fréquences évolutive pour la resélection de cellules - Google Patents

Mesure inter-fréquences évolutive pour la resélection de cellules Download PDF

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Publication number
WO2014153756A1
WO2014153756A1 PCT/CN2013/073374 CN2013073374W WO2014153756A1 WO 2014153756 A1 WO2014153756 A1 WO 2014153756A1 CN 2013073374 W CN2013073374 W CN 2013073374W WO 2014153756 A1 WO2014153756 A1 WO 2014153756A1
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WO
WIPO (PCT)
Prior art keywords
inter
cell
frequency measurements
cell reselection
relaxed
Prior art date
Application number
PCT/CN2013/073374
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English (en)
Inventor
Guillaume DECARREAU
Original Assignee
Nokia Siemens 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 Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to PCT/CN2013/073374 priority Critical patent/WO2014153756A1/fr
Publication of WO2014153756A1 publication Critical patent/WO2014153756A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • the present invention relates to the field of radio communication. More particularly, the invention relates to a method, an apparatus and a computer program product for scaled inter-frequency measurement for cell reselection.
  • HetNet Heterogeneous Network
  • LPNs low power nodes
  • Those LPN are here either to extend the coverage of the macro cell or to allow offload of traffic from the macro cell.
  • the coverage of those LPN is much smaller than the macro cell. The UE can detect them only if they are very close to them.
  • inter-frequency small cells are deployed as hotspots for capacity reasons and to offload users to small cells these small cells can be present anywhere within the macro cell. In order to detect such cells this would require the UE to perform more continuous inter-frequency measurements i.e. not just at coverage edge of the macro, as anticipated when inter-frequency measurement procedures were originally designed, but anywhere within the macro cell coverage area. Having inter-frequency measurement activated more continuously for hotspot discovery on inter-frequency carrier will impact the UE battery life as well as it is likely to have impact on throughput performance. Reason for this impact is due to current UE performance requirements related inter-frequency cell search and measurements (see 3GPP TS 25.133). In such a case, a user equipment (UE) need reselect a small cell to camp on for the purpose of offload of traffic.
  • UE user equipment
  • the UE performs cell reselection process in non-DCH states, i.e. Idle Mode, CELL FACH, CELL PCH, URA PCH.
  • the UE need measures qualities of the serving cell and the neighboring cells and select the best one according to the radio measurements and parameters.
  • Fig. 1 shows a situation that UE will perform a measurement for cell reselection in an inter-frequency configuration.
  • the UE camps on the macro cell C I on frequency F l and is moving towards LPN cell C2 on frequency F2. If the quality of the serving cell, i.e, CI , is higher than S mte rsearch (a threshold, in the case absolute priority is used) then the UE will not make measurements on the LPN on frequency F2 and will not be able to select it.
  • S mte rsearch a threshold, in the case absolute priority is used
  • the UE need continuously measure the quality of the serving cell in the used frequency.
  • the UE shall measure inter-frequency cells only if the quality of the serving cell is below a given threshold. There are two cases for measurements for the cell reselection as below:
  • the UE may choose to not perform inter-frequency measurements.
  • UE may choose not to perform measurements of inter-frequency layers of equal or lower priority.
  • UE shall perform measurements of inter-frequency layers of equal or lower priority.
  • the UE may choose not to perform measurements of inter-frequency layers for which the UE has no absolute priority. Parameters from those inequalities above are defined as below:
  • Sintersearch represents a threshold (in dB) for inter-frequency measurements and for the HCS measurement rules.
  • SsearchHcs represents a threshold used in the measurement rules for cell reselection.
  • HCS When HCS is used, it specifies the limit for Srxlev in the serving cell below which the UE shall initiate measurements of all neighbouring cells of the serving cell.
  • HCS When HCS is not used, it specifies the limit for Srxlev in the serving cell below which the UE ranks inter-frequency neighbouring cells of the serving cell.
  • SrxlevservmgCeii represents the Srxlev value of the serving cell.
  • SqualservmgCeii represents the Squal value of the serving cell.
  • Sx represents the Squal value of the serving cell in case of WCDMA.
  • Spnoritysearchi represents a threshold used in the measurement rules for cell re-selection when absolute priorities are used. It specifies the value of Srxlev in the serving cell controlling the rate of inter-frequency and inter-RAT measurements.
  • Spnoritysearch2 represents a threshold used in the measurement rules for cell reselection when absolute priorities are used. It specifies the value of Squal in the serving cell controlling the rate of inter-frequency and inter-RAT measurements.
  • the UE need to discover small cells that are not on the same frequency as the macro cell. Those small cells are listed in the NCL of the serving cell. The coverage of the small cell is rather small and the number of small cell under the coverage of the macro cell is limited. Thus even the UE would need to perform continuously measurements on the second frequency to find the small cell.
  • an object of the present invention is to provide a method, apparatus and computer program product for scaled inter-frequency measurements for cell reselection during a non-DCH state of a user equipment.
  • a method for scaled inter-frequency measurements for cell reselection during a non-DCH state of a user equipment comprising performing inter-frequency measurements during a period T l without taking into account a quality of a serving cell; performing relaxed inter-frequency measurements (RIFM) during a period T2 in a mandatory way or not as in period T l ; and performing a cell reselection measurement for the cell reselection.
  • RIFM relaxed inter-frequency measurements
  • performing relaxed inter-frequency measurements may comprise performing inter-frequency measurements using relaxed performance requirements.
  • the relaxed performance requirements may comprise at least one of relaxed requirements on the number of measurements and cell discovery.
  • values of Tl and T2 may be provided via at least one of dedicated signaling, the SIBs and default configuration.
  • values of T l and T2 may be 0 or infinity. If the value is infinity, this means that the UE will perform the actions indefinitely.
  • the non-DCH state of the user equipment may comprise at least one of idle mode, CELL FACH, CELL PCH, and URA PCH.
  • the method may further comprise configuring the user equipment using a reconfiguration message.
  • the reconfiguration message may comprise at least one of PHYSICAL CHANNEL RECONFIGURATION; RADIO BEARER RECONFIGURATION; RADIO BEARER RELEASE; RADIO BEARER SETUP; RRC CONNECTION SETUP; TRANSPORT CHANNEL RECONFIGURATION; RRC CONNECTION RELEASE; and RRC CONNECTION REJECT.
  • the cell reselection measurement may be configured based on the information from SIBs.
  • an apparatus for scaled inter-frequency measurements for cell reselection during a non-DCH state of a user equipment comprising means for performing inter-frequency measurements during a period Tl without taking into account a quality of a serving cell; means for performing relaxed inter-frequency measurements during a period T2 in a mandatory way or not as in period T l ; and means for performing a cell reselection measurement for the cell reselection.
  • means for performing relaxed inter-frequency measurements may comprise means for performing inter-frequency measurements using relaxed performance requirements.
  • the relaxed performance requirements may comprise at least one of relaxed requirements on the number of measurements and cell discovery.
  • values of T l and T2 may be provided via at least one of dedicated signaling, the SIBs and default configuration.
  • values of T l and T2 may be 0 or infinity. If the value is infinity, this means that the UE will perform the actions indefinitely.
  • the non-DCH state of the user equipment may comprise at least one of idle mode, CELL FACH, CELL PCH, and URA PCH.
  • the apparatus may further comprise configuring the user equipment using a reconfiguration message.
  • the reconfiguration message comprises at least one of PHYSICAL CHANNEL RECONFIGURATION; RADIO BEARER RECONFIGURATION; RADIO BEARER RELEASE; RADIO BEARER SETUP; RRC CONNECTION SETUP; TRANSPORT CHANNEL RECONFIGURATION; RRC CONNECTION RELEASE; and RRC CONNECTION REJECT.
  • the cell reselection measurement may be configured based on the information from SIBs.
  • a computer program product comprising computer-executable components which perform, when the program is run on a computer, performing inter-frequency measurements during a period T l without taking into account a quality of a serving cell; performing relaxed inter-frequency measurements during a period T2 in a mandatory way or not as in period Tl ; and performing a cell reselection measurement for the cell reselection.
  • the computer program product may embody as a computer-readable storage medium.
  • the present invention can improve inter-frequency measurements for cell reselection of the UE, allowing the UE to perform inter-frequency measurements using relaxed performance requirements and thus to consume less power.
  • the UE can perform inter-frequency measurements in a way that the battery life of the UE will be saved and the traffic will be offloaded from the macro cell according to the present invention.
  • Fig. 1 shows the a scenario that UE is moving from a macro cell to LPN cell in HetNet and thus will require to perform a inter-frequency measurements for cell reselection;
  • Fig.2 shows a flow diagram of the method for scaled inter-frequency measurements for cell reselection according to an embodiment of the present invention
  • Fig.3 is a signaling flow diagram illustrating scaled inter-frequency measurements for cell reselection according to an embodiment of the present invention
  • Fig.4 is a signaling flow diagram illustrating scaled inter-frequency measurements for cell reselection according to another embodiment of the present invention.
  • Fig.5 shows a block diagram of the apparatus for scaled inter-frequency measurements for cell reselection according to an embodiment of the present invention.
  • Fig.2 shows a flow diagram of the method 200 for scaled inter-frequency measurements for cell reselection according to an embodiment of the present invention.
  • the UE will perform the method 200 shown in Fig.2 to conduct a scaled inter-frequency measurement for cell reselection.
  • the non-DCH state of the UE may comprise at least one of idle mode, CELL FACH, CELL PCH, and URA PCH.
  • step S201 the method 200 starts with step S201.
  • step S201 the UE performs inter-frequency measurements during a period Tl without taking into account a quality of a serving cell.
  • the UE may perform inter-frequency measurements in a mandatory way in this step.
  • the step S201 is required in order that the UE may measure the quality of small cells in a macro cell even though the quality of the serving cell is higher than the threshold. In such a way, the UE may look for small cells in the neighboring frequency even though the coverage is good in the macro cell.
  • the battery life of the UE performing step S201 will be short if the UE continuously makes measurements in a mandatory way.
  • step S202 in order to save the battery life of the UE, the UE performs "relaxed inter-frequency measurements" during a period T2 in a mandatory way or not. Specifically, the UE performs inter-frequency measurements using relaxed requirements. This can be done in a mandatory way as in step S201. In other words, the network can request the UE to make mandatory measurements using relaxed requirements. Or, the UE would perform inter-frequency measurements only in a relaxed way, but following the rules about S mte rsearch (in this case T2 is infinity). That is, the UE will perform a type of scaled inter-frequency measurement.
  • T2 is infinity
  • the relaxed inter-frequency measurements using relaxed requirements are the same as the inter-frequency measurement indicated in the SIBs but performance requirements in term of number of measurements, cell discovery etc as specified in the standard 3 GPP TS 25. 133 are lower. Any suitable relaxed performance requirements on the inter-frequency measurement can be taken in the method 200 according to the present invention as long as they can facilitate the saving of the battery life of the UE. For example, during inter-frequency measurements using relaxed requirements, UE could be required to make measurements on the 2nd frequency twice less often than currently specified, which is less than that of the normal case. Obviously, inter-frequency measurements using relaxed requirements (e.g. the decreased number of measurements per DRX) may require less power consumption so that the battery life of the UE is saved.
  • relaxed requirements e.g. the decreased number of measurements per DRX
  • step S201 prior to performing step S202 in inter-frequency measurements according to the invention is mainly based on the consideration as below:
  • the UE will not perform inter-frequency measurements if the quality of the serving cell is good, as discussed above.
  • the UE is required to find an inter-frequency LPN forming a small cell after a data connection with the good quality of the serving cell. In such a case, the UE would take more time and has more chance to miss the desired small cell when moving if the UE only performs relaxed measurements to find the desired small cell in order to save the battery life.
  • step S201 is performed prior to performing step S202 so that the UE can take less time and has more chance to find the desired small cell.
  • step S203 based on measurement results of step S201 and step S202, the UE may perform a cell reselection measurement for the cell reselection as configured in the SIBs.
  • the method 200 according to the present invention can also be applied to intra-frequency measurements because the process of intra-frequency measurements is substantially same as that of inter-frequency measurements.
  • values of T l and T2 may be communicated to the UE through different ways: dedicated signaling, the SIBs and default configuration.
  • the order of magnitudes of T l and T2 can be seconds or minutes.
  • values of Tl and T2 can be 0 or infinity. If the value is 0, this means that the UE will not perform corresponding actions. If the value is infinity, this means that the UE will perform actions indefinitely.
  • the value of T l and the value of T2 can be set 0 simultaneously or respectively depending on different situations. Therefore, different combinations of values of Tl and T2 can result in different processes of inter-frequency measurements.
  • the cell reselection measurement may be configured based on the information from SIBs.
  • Fig.3 is a signaling flow diagram for CELL PCH state illustrating scaled inter-frequency measurements for cell reselection according to an embodiment of the present invention.
  • the UE is configured by the network using a reconfiguration message.
  • the reconfiguration message can be at least one of HYSICAL CHANNEL RECONFIGURATION, RADIO BEARER RECONFIGURATION, RADIO BEARER RELEASE, RADIO BEARER SETUP, RRC CONNECTION SETUP, and TRANSPORT CHANNEL RECONFIGURATION.
  • the reconfiguration message can indicate the desired behavior that the UE will follow and/or values of Tl and T2.
  • this reconfiguration message is sent from RNC to the UE and can indicate RRC state indicator: CELL PCH, Tl and T2. Therefore, values of Tl and T2 are provided the UE through the signaling. It is to be understood that values of Tl and T2 can also be provided via SIBs and default configuration. The UE then moves to CELL PCH state after reception of this reconfiguration message.
  • the period Tl starts with the moment of UE entering
  • the UE receives SIB containing information for cell selection/reselection from serving cell and performs inter-frequency measurements in a mandatory way (i.e. the UE performs inter-frequency measurements without taking into account a quality of a serving cell) if there is a inter-frequency cell in the NCL of the serving cell.
  • the period T2 starts.
  • the UE performs relaxed inter-frequency measurements in a mandatory way or not. Then, the UE follows the legacy rules for inter-frequency measurements for cell reselection after phase 2.
  • Fig.4 is a signaling flow diagram for idle mode illustrating scaled inter-frequency measurements for cell reselection according to another embodiment of the present invention.
  • the UE in case the network sends the UE to idle mode, the UE is configured by the network using a reconfiguration message.
  • the reconfiguration message can be RRC CONNECTION RELEASE or RRC CONNECTION REJECT.
  • this reconfiguration message is sent from RNC to the UE and can indicate idle mode, Tl and T2.
  • the UE then moves to idle mode state after reception of this reconfiguration message.
  • the period Tl starts with the moment of UE entering idle state state.
  • the UE receives SIB containing information for cell selection/reselection from serving cell and performs inter-frequency measurements in a mandatory way if there is a inter-frequency cell in the NCL of the serving cell.
  • the period T2 starts.
  • the UE performs relaxed inter-frequency measurements in a mandatory way or not.
  • the UE uses the information broadcasted in the SIB (e.g., DRX length, Cell ID, frequencies etc) and perform inter-frequency measurements even if the quality of the serving cell is above the threshold. Moreover, the UE uses relaxed requirements for inter-frequency measurements instead of the requirement for inter-frequency measurements and reselection as specified in the standard 3GPP TS 25. 133.
  • SIB e.g., DRX length, Cell ID, frequencies etc
  • the UE will not use following the requirement: "The UE shall measure CPICH Ec/Io and CPICH RSCP at least every T mea sureFDD", "The UE shall measure CPICH Ec/Io and CPICH RSCP at least every (T mea sureFDD)/2”, and a possible variant: "The UE shall measure CPICH Ec/Io and CPICH RSCP at least every (T me asureFDD)/ ", wherein X is a parameter given to the UE via dedicated message or SIB, for example, as described in section 4.2.2.2 "Measurements of intra-frequency cells"
  • the UE follows the legacy rules for inter-frequency measurements for cell reselection.
  • Fig.5 shows a block diagram of the apparatus 500 for scaled inter-frequency measurements for cell reselection according to an embodiment of the present invention.
  • the apparatus 500 may comprise means 501 for performing inter-frequency measurements during a period Tl without taking into account a quality of a serving cell; means 502 for performing relaxed inter-frequency measurements during a period T2; and means 503 for performing a cell reselection measurement for the cell reselection.
  • advantages of the present invention is that the UE can discover inter-frequency small cells without using too much battery power of the UE according to the present invention, which allow the UE camp on the reselected small cell and the traffic will be offloaded from the macro cell.
  • exemplary embodiments of the present invention provide a method for scaled inter-frequency measurement for cell reselection, an apparatus embodying the same, and computer program(s) embodying 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, techniques or methods include, as non limiting examples, implementations as hardware, software, for example in connection with a digital signal processor, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

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

Abstract

L'invention concerne un procédé, un appareil et un produit de programme d'ordinateur pour les mesures inter-fréquences évolutives pour la resélection de cellules durant un état non DCH d'un équipement d'utilisateur. Le procédé consiste à effectuer des mesures inter-fréquences durant une période T1 sans tenir compte de la qualité d'une cellule serveuse; effectuer des mesures inter-fréquences assouplies durant une période T2 d'une façon obligatoire ou non; et effectuer une mesure de resélection de cellule pour la resélection de cellule.
PCT/CN2013/073374 2013-03-28 2013-03-28 Mesure inter-fréquences évolutive pour la resélection de cellules WO2014153756A1 (fr)

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Cited By (5)

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WO2016061081A1 (fr) * 2014-10-17 2016-04-21 Qualcomm Incorporated Préservation de puissance basée sur un mesurage de technologie d'accès inter radio
CN106656442A (zh) * 2015-10-29 2017-05-10 华为技术有限公司 传输系统信息的方法及基站、终端和系统
CN113766572A (zh) * 2019-11-19 2021-12-07 Oppo广东移动通信有限公司 用于测量放松的方法、用户设备和计算机可读介质
JP2022525588A (ja) * 2019-02-15 2022-05-18 オッポ広東移動通信有限公司 端末のための測定方法及び装置、並びに端末
CN115152299A (zh) * 2020-04-09 2022-10-04 Oppo广东移动通信有限公司 无线资源管理测量的控制方法、终端设备、网络设备

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016061081A1 (fr) * 2014-10-17 2016-04-21 Qualcomm Incorporated Préservation de puissance basée sur un mesurage de technologie d'accès inter radio
CN106656442A (zh) * 2015-10-29 2017-05-10 华为技术有限公司 传输系统信息的方法及基站、终端和系统
EP3358777A4 (fr) * 2015-10-29 2019-02-13 Huawei Technologies Co., Ltd. Procédé, station de base, terminal et système permettant de transmettre des informations système
CN110855415A (zh) * 2015-10-29 2020-02-28 华为技术有限公司 传输系统信息的方法及基站、终端和系统
US10588064B2 (en) 2015-10-29 2020-03-10 Huawei Technologies Co., Ltd. Method for transmitting system information, base station, terminal, and system
CN110855415B (zh) * 2015-10-29 2021-10-22 华为技术有限公司 传输系统信息的方法及基站、终端和系统
US11582661B2 (en) 2019-02-15 2023-02-14 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Terminal measurement method and apparatus, and terminal
JP2022525588A (ja) * 2019-02-15 2022-05-18 オッポ広東移動通信有限公司 端末のための測定方法及び装置、並びに端末
JP7323628B2 (ja) 2019-02-15 2023-08-08 オッポ広東移動通信有限公司 端末のための測定方法及び装置、並びに端末
CN113766572A (zh) * 2019-11-19 2021-12-07 Oppo广东移动通信有限公司 用于测量放松的方法、用户设备和计算机可读介质
CN113766572B (zh) * 2019-11-19 2022-12-23 Oppo广东移动通信有限公司 用于测量放松的方法、用户设备和计算机可读介质
US11516691B2 (en) 2019-11-19 2022-11-29 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for measurement relaxation, user equipment, and computer readable medium
CN115152299A (zh) * 2020-04-09 2022-10-04 Oppo广东移动通信有限公司 无线资源管理测量的控制方法、终端设备、网络设备

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