1111111111111111 IIIIII IIIII 111111111111111 II Ill lllll lllll 111111111111111 IIII IIIIIII IIII 11111111
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`PCT
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`WO '1 11 /1 ~l\'1"'1A A 1
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`1Iage:
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`Base station sends request for
`logged measurements A5
`
`Jogged
`
`(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
`(19) World Intellectual Property Organization
`International Bureau
`
`(43) International Publication Date
`29 December 2011 (29.12.2011)
`
`(10) International Publication Number
`n
`\
`/
`2U11/16U274 A l
`
`(51)
`
`(21)
`
`International Patent Classification:
`H04W 24/08 (2009.01)
`
`International Application Number:
`PCT/CN20 10/074 128
`
`(22)
`
`International Filing Date:
`
`(25) Filing Language:
`
`(26) Publication Langi
`
`2 1 June 2010 (21 .06.2010)
`
`English
`
`English
`
`(for all designated States except US) NOKIA
`(71) Applicant
`SIEMENS NETWORKS OY [FI/FI]; Karaportti
`3,
`FIN-02610 Espoo (FI).
`
`(72)
`(75)
`
`Inventors; and
`(for US only): ZHOU, Weihua
`Inventors/ Applicants
`[CN/CN]; Zaojunmiao Jie #16, Haidian District, Beijing
`100081 (CN). ZHANG, Yi
`[CN/CN]; Nanshatan 2#,
`Chaoyang District, Beijing 100101 (CN). TOMALA,
`Malgorzata [PL/PL]; Klonowa 7, PL 26-420 Nowe Mi-
`asto nad Pilica (PL).
`
`(74) Agent: KING & WOOD PRC LAWYERS; 3 1st Floor,
`Tower A, Jianwai SOHO, 39 Dongsanhuan Zhonglu,
`Chaoyang District, Beijing 100022 (CN).
`
`(81) Designated States (unless otherwise indicated, for every
`kind of national protection available): AE, AG, AL, AM,
`AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ,
`CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO,
`DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT,
`HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP,
`KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD,
`ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI,
`NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, SC, SD,
`SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR,
`TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
`
`(84) Designated States (unless otherwise indicated, for every
`kind of regional protection available): ARIPO (BW, GH,
`GM, KE, LR, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG,
`ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, MD, RU, TJ,
`TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK,
`EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU,
`LV, MC, MK, MT, NL, NO, PL, PT, RO, SE, SI, SK,
`SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ,
`GW, ML, MR, NE, SN, TD, TG).
`
`Declarations under Rule 4.17 :
`
`— of inventorship (Rule 4.1 7(iv))
`
`Published:
`
`— with international search report (Art. 21(3))
`
`(54) Title: METHODS AND APPARATUS FOR REPORTING MEASUREMENT INFORMATION
`
`(57) Abstract: A method comprising
`causing a plurality of measurements to
`be performed by a user equipment
`to
`provide measurement
`information;
`causing a message to be sent from the
`user equipment
`to a network element
`indicating that measurement
`informa
`tion is available; and responsive to a
`message from said network element
`requesting said measurement
`informa
`tion, causing a response to be sent
`from the user equipment
`to said net
`work with only some of said measure
`ment information and information in
`dicating that further measurement
`in
`formation is available.
`
`UE goes into idle mode A l
`
`UE makes measurements A2
`
`UE goes into active mode A3
`
`UE sends availability indicator to
`base station A4
`
`UE determines if any logged
`measurements will remain after
`some logged measurements sent
`to base station A6
`
`If no
`measurement remain,
`send requested
`logged measurement
`with availability
`indicator indicating
`no further logged data
`A7
`
`If logged measurements
`remain, send requested logged
`measurements with
`availability indicator
`indicating further logged data
`A8
`
`Figure 6
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`METHODS AND APPARATUS FOR REPORTING MEASUREMENT
`
`INFORMATION
`
`Some embodiments of the present invention relate to methods and
`
`apparatus and in particular but not exclusively to methods and
`
`apparatus for the reporting of measurement
`
`information.
`
`A communication
`
`system can be seen a s a facility that enables
`
`communication sessions between two or more entities such as user
`
`terminals, base stations and/or other nodes by providing carriers
`
`between the various entities involved in the communications path.
`
`A communication
`
`system can be provided for example by means of
`
`a communication network and one or more compatible communication
`
`devices.
`
`The communications
`
`may comprise,
`
`for example,
`
`com
`
`munication
`
`of data for carrying communications
`
`such a s voice,
`
`electronic mail (email) , text message, multimedia and/or content
`
`data and so on. Non-limiting
`
`examples
`
`of services
`
`provided
`
`include
`
`two-way
`
`or multi-way
`
`calls,
`
`data
`
`communication
`
`or
`
`multimedia services and access to a data network system, such a s
`
`the Internet.
`
`In a wireless communication
`
`system at least a part of commu
`
`nications between at least two stations occurs over a wireless
`
`link. Examples of wireless systems include public land mobile
`
`networks
`
`(PLMN) , satellite
`
`based
`
`communication
`
`systems
`
`and
`
`different wireless local networks, for example wireless local
`
`area networks
`
`(WLAN) . The wireless
`
`systems can typically
`
`be
`
`divided
`
`into cells, and are therefore
`
`often referred
`
`to a s
`
`cellular systems.
`
`A user can access
`
`the communication
`
`system by means
`
`of an
`
`appropriate
`
`communication
`
`device or terminal. A communication
`
`device of a user is often referred to as user equipment
`
`(UE) . A
`
`communication
`
`device is provided
`
`with an appropriate
`
`signal
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`receiving and transmitting apparatus for enabling communications,
`
`for example
`
`enabling
`
`access
`
`to a communication
`
`network
`
`or
`
`communications
`
`directly
`
`with other users.
`
`The communication
`
`device may access a carrier provided b y a station, for example
`
`a base station of a cell, and transmit and/or receive commu
`
`nications on the carrier.
`
`The
`
`communication
`
`system
`
`and
`
`associated
`
`devices
`
`typically
`
`operate in accordance
`
`with a given standard or specification
`
`which sets out what the various entities associated
`
`with the
`
`system are permitted to do and how that should be achieved. For
`
`example,
`
`it can be defined
`
`if carrier
`
`aggregation
`
`is used.
`
`Communication protocols and/or parameters which shall b e used for
`
`the connection are also typically defined. A n example of attempts
`
`to solve the problems associated with the increased demands for
`
`capacity
`
`is an architecture
`
`that is known a s the long-term
`
`evolution
`
`(LTE)
`
`of the Universal
`
`Mobile
`
`Telecommunications
`
`System
`
`(UMTS)
`
`radio-access
`
`technology.
`
`The
`
`LTE
`
`is
`
`being
`
`standardized
`
`by the 3rd Generation
`
`Partnership Project
`
`(3GPP) .
`
`The various development stages of the 3GPP LTE specifications are
`
`referred to a s releases. The aim of the standardization
`
`i s to
`
`achieve a communication system with, inter alia, reduced latency,
`
`higher user data rates, improved system capacity and coverage,
`
`and reduced cost for the operator.
`
`A further development of the
`
`LTE is referred to a s LTE-Advanced
`
`(LTE-A) . The LTE-Advanced aims
`
`to provide further enhanced services by means of even higher data
`
`rates and lower latency with reduced cost.
`
`According to an embodiment, there is provided a method comprising
`
`causing a plurality of measurements
`
`to b e performed by a user
`
`equipment to provide measurement information; causing a message
`
`to be sent from the user equipment to a network element indicating
`
`that measurement
`
`information is available; and responsive to a
`
`message from said network element requesting
`
`said measurement
`
`information, causing a response to be sent from the user equipment
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`to said network element with only some of said measurement
`
`information and information indicating that further measurement
`
`information is available.
`
`According to another embodiment, there is provided a method
`
`comprising receiving a message from a user equipment at a network
`
`element indicating that measurement information is available;
`
`responsive to said message, sending a request for at least some
`
`measurement information; and receiving a further message from
`
`said user equipment with only some of said measurement
`
`in¬
`
`formation and information indicating that further measurement
`
`information i s available.
`
`According
`
`to a further embodiment
`
`, there
`
`is provided
`
`an
`
`apparatus comprising at least one processor and at least one
`
`memory comprising computer program code, the at least one memory
`
`and the computer program code configured, with the at least one
`
`processor
`
`to cause the apparatus to:
`
`cause a plurality
`
`of
`
`measurements
`
`to be performed by a user equipment to provide
`
`measurement information; cause a message to be sent from the user
`
`equipment
`
`to a network element indicating
`
`that measurement
`
`information i s available; and responsive to a message from said
`
`network element requesting said measurement information, cause
`
`a response to be sent from the user equipment to said network
`
`element with only some of said measurement
`
`information and
`
`information indicating that further measurement information is
`
`available .
`
`According to a further embodiment, there is provided an apparatus
`
`comprising
`
`at least one processor
`
`and at least one memory
`
`comprising computer program code, the at least one memory and the
`
`computer program code configured, with the at least one processor
`
`to cause the apparatus to: receive a message from a user equipment
`
`at a network element indicating that measurement information is
`
`available; responsive to said message, send a request for at least
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`some measurement information; and receive a further message from
`
`said user equipment with only some of said measurement
`
`in¬
`
`formation and information indicating that further measurement
`
`information i s available.
`
`According to another embodiment, there is provided an apparatus
`
`comprising means for receiving a message from a user equipment
`
`at a network element indicating that measurement information is
`
`available;
`
`responsive
`
`to said message, means for sending a
`
`request for at least some measurement information; and means for
`
`receiving a further message from said user equipment with only
`
`some of said measurement information and information indicating
`
`that further measurement information is available.
`
`According to another embodiment, there is provided an apparatus
`
`comprising means for causing a plurality of measurements to be
`
`performed by a user equipment to provide measurement information;
`
`means for causing a message to be sent from the user equipment
`
`to a network element indicating that measurement information is
`
`available; and means, responsive to a message from said network
`
`element requesting said measurement information, for causing a
`
`response to be sent from the user equipment to said network
`
`element with only some of said measurement
`
`information
`
`and
`
`information indicating that further measurement information is
`
`available .
`
`Some embodiments will now be described, by way of example only,
`
`with reference
`
`to the following
`
`examples
`
`and accompanying
`
`drawings in which:
`
`Figure 1 shows an example of a communication system in which
`
`some embodiments of the present invention may be implemented;
`
`Figure 2 shows an example of a communication device;
`
`Figure 3 shows a first signal flow between a UE and a base
`
`station embodying the present invention;
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`Figure 4 shows a second signal flow between a UE and a base
`
`station embodying the present invention;
`
`Figure 5 schematically shows a base station; and
`
`Figure 6 shows a flow diagram of a method embodying the
`
`present invention.
`
`In the following description certain exemplifying embodiments
`
`are explained with reference to wireless or mobile communication
`
`systems
`
`serving
`
`mobile
`
`communication
`
`devices.
`
`A
`
`wireless
`
`communication system and mobile communication device are briefly
`
`explained with reference to Figures 1 and 2 .
`
`A communication device can be used for accessing various services
`
`and/or applications provided via a communication
`
`system. In
`
`wireless or mobile communication systems the access is provided
`
`via a wireless access interface between mobile communication
`
`devices 1 and an appropriate access system 10. A mobile device
`
`1 can typically access wirelessly a communication system via an
`
`access node such as at least one base station 12 or similar
`
`wireless transmitter and/or receiver node of the access system.
`
`A base station site typically provides one or more cells of a
`
`cellular system. In the figure 1 example the base station 12 is
`
`configured to provide a cell, but could provide, for example,
`
`three sectors, each sector providing a cell. Each mobile device
`
`1 and base station may have one or more radio channels open at
`
`the same time and may receive signals from more than one source.
`
`A base station is typically controlled by at least one appropriate
`
`controller so as to enable operation thereof and management of
`
`mobile communication
`
`devices in communication with the base
`
`station. The control entity can be interconnected with other
`
`control entities. In Figure 1 the controller is shown to be
`
`provided by block 13. An appropriate controller apparatus may
`
`comprise at least one memory, at least one data processing unit
`
`and an input/output interface. The controller may be provided
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`with memory capacity and at least one data processor.
`
`It shall
`
`be understood
`
`that the control
`
`functions
`
`may be distributed
`
`between a plurality of controller units. The controller apparatus
`
`for a base station may be configured to execute an appropriate
`
`software code to provide the control functions a s explained below
`
`in more detail.
`
`In the example shown in Figure 1 , the base station node 12 is
`
`connected to a data network 2 0 via an appropriate gateway 15. A
`
`gateway function between the access system and another network
`
`such as a packet data network may be provided by means of any
`
`appropriate
`
`gateway
`
`node, for example
`
`a packet data gateway
`
`and/or an access gateway. A communication
`
`system may thus be
`
`provided b y one or more interconnect
`
`networks and the elements
`
`thereof,
`
`and one or more gateway
`
`nodes may be provided
`
`for
`
`interconnecting
`
`various networks.
`
`In some embodiments the base
`
`station node is an eNodeB.
`
`A communication device can b e used for accessing various services
`
`and/or applications.
`
`The communication
`
`devices can access the
`
`communication system based on various access techniques, such as
`
`code division multiple access (CDMA) , or wideband CDMA (WCDMA) .
`
`The latter technique is used by communication
`
`systems based on
`
`the third Generation Partnership Project (3GPP) specifications.
`
`Other examples
`
`include time division multiple
`
`access
`
`(TDMA ),
`
`frequency
`
`division
`
`multiple
`
`access
`
`(FDMA) , space
`
`division
`
`multiple access (SOMA) and so on. A non-limiting example of mobile
`
`architectures
`
`where
`
`the herein
`
`described
`
`principles
`
`may b e
`
`applied
`
`is known a s the Evolved
`
`Universal
`
`Terrestrial
`
`Radio
`
`Access Network
`
`(E-UTRAN) .
`
`Non-limiting
`
`examples of appropriate
`
`access nodes are a base
`
`station of a cellular system, for example what is known a s NodeB
`
`or enhanced NodeB
`
`(eNB) in the vocabulary
`
`of the 3GPP speci-
`
`fications.
`
`The eNBs may provide E-UTRAN features such a s user
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`plane Radio Link Control/Medium
`
`Access Control/Physical
`
`layer
`
`protocol
`
`(RLC /MAC/PHY) and control plane Radio Resource Control
`
`(RRC) protocol terminations towards mobile communication devices.
`
`Other examples include base stations of systems that are based
`
`on technologies such as wireless local area network (WLAN) and/or
`
`WiMax
`
`(Worldwide Interoperability
`
`for Microwave Access) .
`
`Figure
`
`2 shows
`
`a schematic,
`
`partially
`
`sectioned
`
`view of a
`
`communication
`
`device 1 that can be used for communication
`
`on
`
`carrier
`
`1 1 with at least one other wireless
`
`station. An ap¬
`
`propriate
`
`mobile communication
`
`device may be provided by any
`
`device capable of sending and receiving radio signals. Such a
`
`communication
`
`device may be referred to a s a user equipment UE.
`
`Non-limiting
`
`examples include a mobile station
`
`(MS) such a s a
`
`mobile phone or smart phone, a portable computer provided with
`
`a wireless interface card or other wireless interface facility,
`
`personal
`
`data assistant
`
`(PDA) provided
`
`with wireless
`
`commu¬
`
`nication capabilities, or any combinations of these or the like.
`
`The communication
`
`device
`
`or UE may
`
`in some embodiments
`
`be
`
`stationary
`
`and generally fixed in position.
`
`A mobile communication
`
`device may be used for voice and video
`
`calls, for accessing service applications
`
`provided via a data
`
`network. The mobile device 1 may receive signals via appropriate
`
`apparatus
`
`for
`
`receiving
`
`and
`
`transmitting
`
`radio
`
`signals
`
`on
`
`wireless carriers, or radio bearers. In Figure 2 a transceiver
`
`i s designated
`
`schematically
`
`by block 7 . The transceiver may be
`
`provided
`
`for example by means of a radio part and associated
`
`antenna arrangement.
`
`The antenna arrangement
`
`may be arranged
`
`internally or externally to the mobile device.
`
`A mobile device
`
`is also typically
`
`provided with at least one data processing
`
`entity 3 , at least one memory 4 and other possible components 9
`
`for use in tasks it is designed to perform. The data processing,
`
`storage and other entities can b e provided
`
`on an appropriate
`
`circuit board and/or in chipsets.
`
`This feature is denoted by
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`reference
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`6 . The user may control the operation of the mobile
`
`device by means of a suitable user interface such as key pad 2 ,
`
`voice commands,
`
`touch sensitive
`
`screen or pad, combinations
`
`thereof or the like. A display 5 , a speaker and a microphone are
`
`also
`
`typically
`
`provided.
`
`Furthermore,
`
`a mobile
`
`device
`
`may
`
`comprise appropriate
`
`connectors
`
`(either wired or wireless) to
`
`other devices and/or for connecting external accessories,
`
`for
`
`example hands-free
`
`equipment, thereto.
`
`Some embodiments of the present invention may be implemented in
`
`an LTE system, for example the LTE-A system.
`
`O f course other
`
`embodiments
`
`of the present
`
`invention
`
`may be used with other
`
`releases of the LTE standard. Yet further embodiments
`
`of the
`
`present invention may b e used with the standards other than the
`
`LTE standard.
`
`Minimizing drive tests (MDT) has been proposed in 3GPP RAN Working
`
`Groups. In some embodiments
`
`of the invention,
`
`automatic
`
`col¬
`
`lection of UE measurements
`
`may be defined. In some embodiments
`
`o f the invention, this may enable easier monitoring of network
`
`performance
`
`and may replace expensive drive-tests performed by
`
`operators manually. This functionality
`
`requires relevant input
`
`from the terminal or UE.
`
`Currently, in 3GPP two MDT reporting approaches have been agreed
`
`and accepted. One approach is Immediate MDT reporting. Immediate
`
`MDT reporting means that a UE needs to report MDT measurements
`
`immediately to a base station right after MDT measurement has been
`
`made .
`
`Another approach is Logged MDT reporting. In Logged MDT reporting,
`
`a UE in an idle mode will make some MDT measurement results, and
`
`the UE will report these measurements to the network when the UE
`
`connects again to the network. The idle mode occurs when the UE
`
`is switched on and not actively connected
`
`to the network. A n
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`active connection occurs, for example, when the UE is on a call
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`or has an active data connection to, for example, the Internet.
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`The measurements made by the UE when in the idle mode relate to
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`the serving cell and/or neighboring cells. These measurements may
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`be o f any suitable parameter such a s signal strength of the
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`respective cell a s received at the UE . The signal strength of a
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`reference signal, for example a pilot signal, may be measured.
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`Alternatively
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`or additionally interference information may be
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`determined by the UE . The UE may be arranged to provide one or
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`more types of measurement information for one or more cells.
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`The logging MDT may have one or more of the following defined:
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`Threshold - this defines one or more thresholds above or below
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`which measurements
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`are performed.
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`For example the UE may be
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`controlled only to make logging measurements of neighboring cells
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`when the signal strength of the serving cell falls below a given
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`threshold value.
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`Trigger quantity - this may b e for event related measurements.
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`For example this will define one or more measures needed to be
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`used to evaluate a triggering
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`condition for the event. The
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`quantities will trigger the UE to start or stop making logging
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`measurements. This may be associated with the serving cell and/or
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`one or more neighboring cells radio environment measurements,
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`such a s CPICH (common pilot channel) RSCP (received signal code
`
`power) , CPICH Ec/No (ratio of energy to noise) , or TDD (Time
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`division
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`duplex)
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`P-CCPCH
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`(Primary Common
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`Control
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`Physical
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`Channel) RSCP and ISCP (Interference signal code power), RSRP
`
`(reference signal received power) and RSRQ (reference signal
`
`received quality) .
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`Report quantity -this may be associated with the trigger quantity.
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`For example this will be measurement results, which fulfilled the
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`triggering condition.
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`Report amount - this may be the number of measurements made or
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`may be the maximum amount of logged data. It may b e that different
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`measurements
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`result in a differing amount of logged data.
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`Measurement interval
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`this may be the frequency at which periodic
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`measurements
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`are made.
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`Measurement area - this may define the size of the area for which
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`measurements may be made. In one embodiment this may instead be
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`defined by a minimum signal strength.
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`One or more of the above may b e controlled by at least one of the
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`network and the UE. The values of one or more of the above may
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`be changed b y the network. This may be done during an active
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`connection and may b e done via RRC messaging.
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`When the UE becomes active, after being in the idle mode, the UE
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`indicates the availability of stored logged MDT reports to the
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`network. When the network gets this information, the network will
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`initiate the UE to report logged MDT reports to network. In one
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`embodiment an availability indication is provided to indicate
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`that there are stored logged MDT reports. In one embodiment, that
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`availability indication may be implemented with one bit, with one
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`value of the bit (for example "1") indicating the availability
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`of the information and the other value (for example "0") in¬
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`dicating that no information is available.
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`The UE may send this indication using one or more of the following
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`messages :
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`1 .
`
`A connection set up message such as RRCConnectionSetupComplete
`
`at RRC (Radio Resource control) connection establishment;
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`2 .
`
`A
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`connection
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`re-establishment
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`message
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`such
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`as
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`RRCConnectionReestablishmentComplete
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`at
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`RRC
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`connection
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`re-establishment;
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`and
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`3 .
`
`A handover message such a s RRCConnectionReconf igurationComplete
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`at UE HO (handover) .
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`When the network receives the availability indicator within one
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`or more of the above messages, the network may decide when to use
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`request
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`and response
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`procedures,
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`such a s UEInf ormationRe-
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`quest/Response procedures, to retrieve logged MDT reports from
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`the UE.
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`The MDT measurement
`
`reporting may share the Signaling Radio
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`Bearers SRB2 with one or more other RRC messages. Reference will
`
`now be made to Figure 3 which shows one method of logged MDT
`
`measurement reporting embodying the present invention. In step
`
`Si, the UE 1 send to the base station 12 a message indicating that
`
`the connection set up has been complete. The message will include
`
`the availability indicator which indicates that there are logged
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`MDT measurements.
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`In one embodiment,
`
`that message may be a
`
`RRCConnnectionSetupComplete
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`message.
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`In step S2, the base station 12 is arranged to send a message to
`
`the UE requesting the logged MDT measurements. This message in
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`one embodiment of the invention may be a UEInf ormationRequest
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`message.
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`In step S3, the UE is arranged to provide a response with a list
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`of logged
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`MDT
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`measurements,
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`and,
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`in
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`one
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`embodiment,
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`the
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`availability indicator is provided with a value indicating that
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`there are no logged measurements still to retrieve. A s will be
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`discussed later, in some alternative embodiments, the avail
`
`ability indication can selectively indicate whether or not there
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`are further logged measurements still to be retrieved.
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`In some embodiments, the UE can put all its logged MDT meas¬
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`urements into one response message such as a UEInf ormation-
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`Response message. In some embodiments of the invention, there may
`
`be no explicit size limitation of RRC messages. Then, in some
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`embodiments, only one round of logged MDT measurement retrieval
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`is sufficient to obtain the logged MDT measurements.
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`However, in some embodiments of the invention the number of logged
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`MDT measurements in UE may b e too large in some cases, to be
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`practically
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`contained in a single response message. This may
`
`occur, for example, where the UE has been in the idle mode for
`
`a relative long time and has a relatively
`
`large number of
`
`measurements. This may alternatively or additionally occur where
`
`the UE sends an availability indicator to network indicating
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`logged MDT measurements, but network is very busy. A s the network
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`is busy, the network may not initiate logged MDT measurements
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`reporting before the UE goes into the idle mode again. This may
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`alternatively
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`or additionally
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`occur
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`if the
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`UE
`
`sends
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`the
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`availability indicator to the network, but the network does not
`
`support
`
`the MDT feature. Accordingly
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`the network will not
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`initiate logged MDT measurements reporting before UE goes into
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`the idle mode again.
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`If there are too many logged MDT measurements waiting to b e sent
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`to the network, using one response message may not be appropriate,
`
`since it will make the response message too big, and/or may block
`
`other important RRC messages also carried by the SRB2 . If the UE
`
`does not send all the logged MDT measurements which the UE has,
`
`then the UE may have to wait for the next one of 1 ) connection
`
`setup complete message; 2 ) connection reestablishment complete
`
`message; or 3 ) connection reconfiguration complete message.
`
`In some scenarios, the UE may go into the idle mode again, before
`
`the UE is able to send one of the three messages mentioned
`
`previously. In some cases, if UE waits too long for an opportunity
`
`to send some of the logged MDT measurements, some o f the logged
`
`MDT measurements may be out of time and thus not valid. These
`
`measurements may have to b e deleted.
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`In some embodiments of the invention, there may be a plurality
`
`of rounds of logged MDT measurements reporting.
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`Each round has
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`some o f the logged MDT measurements in one response message. The
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`number of logged measurements and/or the size of the response
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`message may be capped or have an upper limit in order to keep the
`
`response message within an acceptable size. By way of example only,
`
`the response message from the UE may be an UEInf ormationResponse .
`
`In some embodiments of the present invention, the three messages
`
`mentioned
`
`previously
`
`may b e used to send the availability
`
`indicator to the network. The three messages are 1 ) connection
`
`setup complete message; 2 ) connection reestablishment complete
`
`message; or 3 ) connection
`
`reconfiguration
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`complete message.
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`Additionally or alternatively the UE may be arranged to use other
`
`messages to provide the availability indication to the network.
`
`For example, any RRC message between the UE and the network may
`
`be used to carry the availability indicator from the UE to the
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`network. The availability indicator may be a single bit indicator
`
`as discussed above or may take any other suitable form. For
`
`example the availability indicator may have more than one bit and
`
`may be arranged to provide more complex information. Alter
`
`natively or additionally the availability may be provided by
`
`encoded data.
`
`In one embodiment, it is proposed to use a UE information response
`
`to carry some of the logged MDT measurements and optionally an
`
`up-to-date availability indicator to the base station. Reference
`
`is made to Figure 4 which shows the signal flow in a method
`
`embodying the present invention. Steps T and T 2 are the same a s
`
`steps S I and S2 and will not be described in more detail. Step
`
`T 3 is the same as step S3, but this time the availability indicator
`
`indicates that the there are further logged MDT reports which have
`
`yet to be sent.
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`In step T , the base station
`
`requests
`
`further
`
`logged MDT
`
`measurement information from the UE.
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`In step T5,
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`the UE sends the remainder
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`of the logged MDT
`
`measurements and the availability indicator is set to indicate
`
`that no further MDT reports are available.
`
`It should b e appreciated that in alternative embodiments, more
`
`than two messages may be sent from the UE to the network in some
`
`embodiments of the invention.
`
`In one alternative embodiments of the invention, the base station
`
`may send a single request for the logged MDT information, with
`
`the UE sending the response with all the MDT information in two
`
`or more messages.
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`In some embodiments of the invention, the availability indication
`
`can be provided by the UE along with some further information.
`
`In some embodiments of the invention the further information may
`
`be provided by the UE without the availability indication. The
`
`availability information may be in the latter case be implicitly
`
`provided by the further information. The further information may
`
`comprise one or more of the following:
`
`1 .
`
`Information indicating the size of the remaining infor
`
`mation in the log of the UE. This is the part of the log which
`
`has yet to be transmitted to the network.
`
`2 .
`
`Information of the number of chunks or messages which the
`
`UE will use to transmit the whole log.
`
`The base station may in its request for the logged MDT information
`
`provide an indication as to the maximum size of logged MDT data
`
`or size of message
`
`incorporating
`
`the logged MDT data. The
`
`information
`
`may be provided
`
`in alternative
`
`embodiments
`
`in
`
`messages other than the request for logged MDT reports. The
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`quantity information from the base station may be in any other
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`suitable form in alternative embodiments of the invention.
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`Thus in preferred embodiments of the invention, the UE meas
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`urement logs may b e split. The measurement logs may be split when
`
`the amount of data exceeds a threshold or where the message size
`
`will exceed a given threshold.
`
`This may avoid difficulties
`
`associated with always including the measurement logs in a single
`
`RRC message. Of course if the measurement log is small enough,
`
`the measurement log may be included in a single message. This may
`
`mean that the shared capacity among all messages utilizing the
`
`SRB2 is better controlled.
`
`Reference is made to Figure 6 which shows a flow diagram o f a
`
`method embodying the present invention.
`
`In the first step Al, the UE enters the idle mode. The UE may enter
`
`an idle mode after being switched on or may enter the idle mode
`
`after an active connection has been terminated leaving no open
`
`active connections.
`
`In the second step A2, the UE performs the MDT measurements, a s
`
`discussed previously.
`
`In the third step A3, the UE enters the active mode. This may be
`
`initiated by the base station or the UE .
`
`In the fourth step A4, the UE sends the availa