US008594657B2
`
`(12) United States Patent
`W
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 8,594,657 B2
`Nov. 26, 2013
`
`(54) METHOD FOR REPORTING MDT LOG AND
`MOBILE COMMUNICATION DEVICE
`UTILIZING THE SAME
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`(75) Inventor: Chih-Hsiang Wu, Taoyuan County
`(TW)
`(73) Assignee: HTC Corporation, Taoyuan (TW)
`
`(*) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 192 days.
`
`(21) Appl. No.: 13/159,269
`
`(22) Filed:
`
`Jun. 13, 2011
`
`(65)
`
`Prior Publication Data
`US 2011/0306345 A1
`Dec. 15, 2011
`
`Related U.S. Application Data
`(60) Provisional application No. 61/354,966, filed on Jun.
`15, 2010, provisional application No. 61/377,994,
`filed on Aug. 30, 2010, provisional application No.
`61/378.400, filed on Aug. 31, 2010.
`
`(2009.01)
`(2009.01)
`(2009.01)
`
`(51) Int. Cl.
`H04/24/00
`H04.736/00
`H0474/00
`(52) U.S. Cl.
`USPC ............ 455/423; 455/436: 455/464; 370/331
`(58) Field of Classification Search
`USPC ........... 455/423,436,437, 464, 455; 370/331
`See application file for complete search history.
`
`2006/0276.188 A1* 12/2006 Pekonen et al. .............. 455,423
`2007/0129.088 A1* 6, 2007 Gao et al. .......
`... 455,464
`2007/0207814 A1* 9, 2007 USuda et al. .................. 455,455
`2009, O144340 A1
`6/2009 Ferguson et al.
`2010.0003981 A1
`1/2010 Ahluwalia .................... 455,436
`2010/0285806 A1* 11/2010 Iwamura .....
`... 455,437
`2011/011.6470 A1* 5, 2011 Arora et al. ................... 370,331
`OTHER PUBLICATIONS
`
`3GPP TS 37.320 V0.5.0 (May 2010).*
`3GPP TS 25.331 V9.1.0 (Dec. 2009), 3rd Generation Partnership
`Project; Technical Specification Group Radio Access Network;
`Radio Resource Controll (RRC); Protocol specification (Release 9).
`3GPP TS 36.331 V9.1.0 (Dec. 2009), 3rd Generation Partnership
`Project; Technical Specification Group Radio Access Network:
`Evolved Universal Terrestrial Radio Access (E-UTRA); Radio
`Resource Control (RRC); Protocol specification (Release 9).
`(Continued)
`Primary Examiner — Meless NZewdu
`Assistant Examiner — William Nealon
`(74) Attorney, Agent, or Firm — Birch, Stewart, Kolasch &
`Birch, LLP
`ABSTRACT
`(57)
`Methods and mobile communication devices for reporting an
`MDT log are provided. The method is used in a mobile
`communication device in a service network comprising a
`plurality of cells. The method comprises transmitting, by the
`mobile communication device, an MDT log to the service
`network via a serving cell upon receiving a request message
`for the MDT log; and terminating, by the mobile communi
`cation device, the transmission of the MDT log in response to
`a change of the serving cell from a first cell to a second cell in
`the service network.
`13 Claims, 13 Drawing Sheets
`
`
`
`S900
`
`
`
`S902
`Receive a request message for MDT log
`S904
`Transmit MDT log to RAN via a serving cell
`S912
`S906
`
`MDT log transmission
`completed
`
`Receive a termination
`request upon a serving
`cell change
`
`S914
`
`S908
`
`Remove MDT log
`
`Terminate the MDT
`log transmission
`
`
`
`
`
`
`
`Serving cell change
`completed
`
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`US 8,594,657 B2
`Page 2
`
`(56)
`
`References Cited
`
`OTHER PUBLICATIONS
`
`3GPP TS 37.320 V0.5.0 (May 2010), 3rd Generation Partnership
`Project; Techical Specification Group TSG RAN Universal Terres
`trial Radio Access (UTRA) and evolved Universal Terrestrial Radio
`Access (E-UTRA); Radio measurement collection for Minimization
`of Drive Tests (MDT); Overall description; Stage 2 (Release 10).
`3GPP TS 37.320, "3rd Generation Partnership Project; Technical
`Specification Group TSG RAN Universal Terrestrial Radio Access
`(UTRA) and Evolved Universal Terrestrial radio Access (E-UTRA);
`Radio Measurement Collection . . .” V0.5.0, May 2010, 13 pages,
`XPOSO423423.
`Catt, “Handling of the Log Available Indication.” 3GPP TSG WG2
`Meeting #70, R2-102793, Montreal, Canada, May 10-14, 2010, 2
`pages, XP050423135.
`Nokia Corporation, Nokia Siemens Networks, “MDT Architecture
`for Connected Mode Reporting.” 3GPP TSG-RAN WG2 Meeting
`
`#69, R2-100247, San Francisco, United States, Feb. 22-26, 2010, 3
`pages, XP050421728.
`Nokia Corporation, Nokia Siemens Networks, “MDT Architecture
`for Idle Mode Reporting.” 3GPP TSG-RAN WG2 Meeting #69,
`R2-100245, San Francisco, United States, Feb. 22-26, 2010, 5 pages,
`XPOSO421727.
`3GPP TSG RAN WG2 #70; May 10-14, 2010, Montreal, Canada:
`Samsung: “Configuration handling for logged MDT”: R2-102783:
`XP050423127; 3 pages.
`3GPP TSG-RAN WG2 #70; May 10-14, 2010, Montreal, Canada;
`R2-102997: NTT Docomo, Inc.; “MDT support for roaming and
`network sharing scenarios'; XP050423216; 4 pages.
`3GPP TSG RAN WG2 #70; May 10-14, 2010, Montreal, Canada;
`4.3.1: Samsung; Configuration handling for logged MDT, Discus
`sion; pp. 1-3.
`3GPP TSG-RAN WG2 #70; May 10-14, 2010, Montreal, Canada;
`NTT DOCOMO, Inc., MDT support for roaming and network shar
`ing scenarios; Discussion; 4.3.1.4, pp. 1-4.
`* cited by examiner
`
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`U.S. Patent
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`Sheet 1 of 13
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`U.S. Patent
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`Sheet 2 of 13
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`US 8,594,657 B2
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`U.S. Patent
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`U.S. Patent
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`U.S. Patent
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`Nov. 26, 2013
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`Sheet 6 of 13
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`US 8,594,657 B2
`
`S600
`
`S602
`Receive a request message for MDT log
`S604
`Transmit MDT log to RAN via a serving cell
`S612
`S606
`MDT log transmission
`completed
`
`
`
`
`
`
`
`Change
`in serving cell?
`
`NO
`
`S614
`
`Yes S608
`
`Remove MDT log
`
`S616
`
`Terminate the MDT
`log transmission
`S610
`Serving cell change
`
`
`
`FIG. 6
`
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`U.S. Patent
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`US 8,594,657 B2
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`U.S. Patent
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`Nov. 26, 2013
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`Sheet 9 of 13
`
`US 8,594,657 B2
`
`S900
`
`S902
`Receive a request message for MDT log
`S904
`Transmit MDT log to RAN via a serving cell
`S912
`
`MDT log transmission
`completed
`
`Receive a termination
`request upon a Serving
`cell change
`
`S914
`
`
`
`S908
`
`Remove MDT log
`
`S916
`
`Terminate the MDT
`log transmission
`S910
`Serving cell change
`
`FIG. 9
`
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`U.S. Patent
`U.S. Patent
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`Nov.26, 2013
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`Nov.26, 2013
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`US 8,594,657 B2
`
`1.
`METHOD FOR REPORTING MIDT LOG AND
`MOBILE COMMUNICATION DEVICE
`UTILIZING THE SAME
`
`CROSS REFERENCE TO RELATED
`APPLICATIONS
`
`This application claims priority of U.S. Provisional Appli
`cations No. 61/354,966, filed on Jun. 15, 2010, No. 61/377,
`994, filedon Aug. 30, 2010, and No. 61/378,400, filedon Aug.
`31, 2010, the entirety of which are incorporated by reference
`herein.
`
`BACKGROUND OF THE INVENTION
`
`10
`
`15
`
`1. Field of the Invention
`The present invention relates to Minimization of Device
`Test (MDT), and in particular relates to methods and mobile
`communication devices for reporting an MDT log.
`2. Description of the Related Art
`In a typical mobile communication environment, a user
`equipment (UE) may communicate Voice and/or data signals
`with one or more service networks via cellular stations of the
`service networks. The wireless communications between the
`UE and the service networks may be in compliance with
`various wireless technologies, such as the Wideband Code
`Division Multiple Access (WCDMA) technology, Code Divi
`sion Multiple Access 2000 (CDMA2000) technology, Time
`Division-Synchronous Code Division Multiple Access (TD
`SCDMA) technology, Worldwide Interoperability for Micro
`30
`wave Access (WiMAX) technology, Long Term Evolution
`(LTE) technology, and others.
`An MDT is a collection of measurements and data logging
`activities performed by a user equipment to replace the
`manual drive testing that operators have to perform in a tele
`communication network. The MDT evaluates network per
`formance per physical location, and is applicable in various
`telecommunication systems such as the High Speed Packet
`Access (HSPA) and LTE systems. A method and communi
`cation device for reporting an MDT log in the applicable
`40
`telecommunication system is thus required.
`
`25
`
`35
`
`BRIEF SUMMARY OF THE INVENTION
`
`45
`
`A detailed description is given in the following embodi
`ments with reference to the accompanying drawings.
`An embodiment of a method of reporting MDT logs for a
`mobile communication device in a service network compris
`ing a plurality of cells is disclosed. The method comprises:
`transmitting, by the mobile communication device, an MDT
`50
`log to the service network via a serving cell upon receiving a
`request message for the MDT log; and terminating, by the
`mobile communication device, the transmission of the MDT
`log in response to a change of the serving cell from a first cell
`to a second cell in the service network.
`Another embodiment of a method of reporting an MDT log
`for a mobile communication device in a service network is
`disclosed. The method comprises: receiving, by the mobile
`communication device, a first request message for the MDT
`log from the service network; and in response to the first
`60
`request message, transmitting, by the mobile communication
`device, a first response message comprising apart of the MDT
`log to the service network; wherein the first response message
`indicates whether the MDT log reporting is finished or
`whether at least one more part of the MDT log is available.
`Another embodiment of a method of reporting an MDT log
`for a mobile communication device in a service network is
`
`55
`
`65
`
`2
`disclosed. The method comprises: receiving, by the mobile
`communication device, a request message for the MDT log
`from the service network; and in response to the request
`message, transmitting, by the mobile communication device,
`at least two response messages each comprising a part of the
`MDT log to the service network.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The present invention can be more fully understood by
`reading the Subsequent detailed description and examples
`with references made to the accompanying drawings,
`wherein:
`FIG. 1 is a block diagram illustrating a mobile communi
`cation environment according to an embodiment of the inven
`tion;
`FIG. 2 is a block diagram illustrating another mobile com
`munication environment according to an embodiment of the
`invention;
`FIG.3 is a message sequence chart for conventional MDT
`log reporting:
`FIG. 4 is a message sequence chart of a Logged MDT
`reporting method according to an embodiment of the inven
`tion;
`FIG. 5 is a message sequence chart of another Logged
`MDT reporting method according to an embodiment of the
`invention.
`FIG. 6 is a flow chart depicting an MDT log reporting
`method of a mobile communication device according to an
`embodiment of the invention;
`FIG. 7 is a message sequence chart of another Logged
`MDT reporting method according to an embodiment of the
`invention;
`FIG. 8 is a message sequence chart of another Logged
`MDT reporting method according to an embodiment of the
`invention;
`FIG. 9 is a flow chart illustrating an MDT log reporting
`method of a mobile communication device according to an
`embodiment of the invention;
`FIG. 10 is a message sequence chart of another Logged
`MDT reporting method according to an embodiment of the
`invention;
`FIG. 11 is a message sequence chart of another Logged
`MDT reporting method according to an embodiment of the
`invention;
`FIG. 12 is a message sequence chart of another Logged
`MDT reporting method according to an embodiment of the
`invention; and
`FIG. 13 is a message sequence chart of another Logged
`MDT reporting method according to an embodiment of the
`invention.
`
`DETAILED DESCRIPTION OF THE INVENTION
`
`The following description is made for the purpose of illus
`trating the general principles of the invention and should not
`be taken in a limiting sense. The scope of the invention is best
`determined by reference to the appended claims.
`FIG. 1 is a block diagram illustrating a mobile communi
`cation environment according to an embodiment of the inven
`tion. The mobile communication environment 1 is a Univer
`sal Mobile Telecommunication System (UMTS) network
`comprising an UMTS Terrestrial Radio Access Network (UT
`RAN) 12 and the core network 14, where the UTRAN 12
`comprises Node B base stations 120a and 120b, and radio
`network controllers (RNC) 122a and 122b. Each Node B is
`coupled to a plurality of antennas (not shown), each antenna
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`thereof provides a radio coverage covering a specific area or
`for a specific network operator, and is referred to as a cell
`herein. In the UMTS network, a mobile communication
`device 10 is in connection with Node B 120a or 120b through
`a radio Uu interface based on the WCDMA technology,
`which in turn is coupled to the RNCs 122a or 122b through Iu
`interfaces based on the ATM technology, where an Iub inter
`face is utilized between a nodeB base station and a RNC, and
`an Iur interface is utilized between RNCs. The cell providing
`radio connection between the UTRAN 12 and the mobile
`communication device 10 is referred to as a serving cell, and
`the RNC in charge of an RRC connection between the mobile
`communication device 10 and the UTRAN 12 is known as a
`serving RNC (SRNC). The RNCs 122a and 122b are further
`coupled to the core network 14 through IuCS and IuPS inter
`faces to access circuit-switched (CS) services and packet
`switched (PS) services respectively. The Core Network (CN)
`14 consists of two service domains including the CS service
`domain interfacing with CS based network such as Public
`Switched Telephone Network (PSTN) or Integrated Services
`Digital Network (ISDN) and the PS service domain interfac
`ing with Internet Protocol (IP) based Network such as the
`Internet.
`FIG. 2 is a block diagram illustrating another mobile com
`munication environment according to an embodiment of the
`25
`invention. The mobile communication environment 2 is an
`LTE system comprising an Evolved UTRAN (EUTRAN) 22
`and a core network 24. The EUTRAN 22 comprises Evolved
`Node Bs (eNB) 220a and 220b which communicate to each
`other through an X2 interface, and are coupled to the core
`network 24 throughan S1 interface. A mobile communication
`device 20 is in connection with the eNB 220a or 220b. The
`core network 24 comprises only PS service domain in the LIE
`system. Each eNB is coupled to a plurality of antennas
`responsible for providing a radio coverage covering a specific
`area or for a specific network operator. The cell directly in
`connection with the mobile communication device 20 is
`referred to as a serving cell.
`The mobile communication device 10 in FIG. 1 and the
`mobile communication device 20 in FIG. 2 are any device
`used for the communication, e.g., handhold mobile phones,
`laptop determiners equipped with broadband network adap
`tors, or any other device capable of communicating. The
`mobile communication device 10 comprises a control module
`102 and a communication module 100, and the mobile com
`45
`munication device 20 comprises a control module 202 and a
`communication module 200. The control modules 102 and
`202 may comprise hardware to perform baseband signal pro
`cessing including digital signal processing, coding and
`decoding, and so on. The communication modules 100 and
`200 may comprise hardware to perform analog to digital
`conversion (ADC), digital to analog conversion (DAC), gain
`adjusting, modulation, demodulation, and so on. The com
`munication modules 100 and 200 may receive RF signals
`from the Node B 120 and eNB 220 respectively and down
`55
`convert the received RF signals to baseband signals to be
`processed by the control modules 102 and 202 respectively, or
`receive baseband signals from the control modules 102 and
`202 respectively and up-convert the received baseband sig
`nals to RF signals for uplink transmission. The radio fre
`quency may be 900 MHz, 1900 MHz, or 2100 MHz utilized
`in WCDMA systems, or may be 900 MHz, 2100 MHz, or 2.6
`GHz utilized in LTE systems, or others depending on the
`radio access technology (RAT) in use. The control modules
`102 and 202 control the operation of the communication
`65
`modules 100 and 200 respectively, and other functional com
`ponents, such as a display unit and/or keypad serving as an
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`MMI (man-machine interface), a storage unit storing the pro
`gram codes of applications or technologies, or others. The
`mobile communication device 10 is a UE in compliance with
`the 3GPP TS 25.331 specification and other related specifi
`cations of the WCDMA technology, and the mobile commu
`nication device 20 is a UE in compliance with 3GPP TS
`36.331 specification and other related specifications of the
`LTE technology, and the invention is not limited thereto.
`The MDT comprises two types, namely, an Immediate
`MDT and a Logged MDT. The Immediate MDT is a func
`tionality involving measurements performed by a mobile
`communication device in a CONNECTED state and report
`ing of the measurements to an eNB/RNC available at the time
`of the reporting condition. The Logged MDT is a functional
`ity involving measurements performed by a mobile commu
`nication device in an IDLE state at points in time when
`configured conditions are satisfied, wherein the collected
`measurements (also called MDT measurements hereafter) are
`stored in a measurement log (also called MDT log hereafter)
`for reporting to an eNB/RNC at a later point in time. The
`MDT log may contain one MDT measurement or a plurality
`of MDT measurements. The mobile communication device
`(10 or 20) is configured with a Logged MDT configuration in
`the CONNECTED state to perform Logged MDT measure
`ments in the IDLE state. The mobile communication device
`(10 or 20) collects MDT measurements which are measured
`results for the serving cell and neighbor cells and keeps the
`MDT measurements in its memory component. The mobile
`communication device (10 or 20) indicates the availability of
`the MDT log by means of a one bit indicator in an RRCCo
`nnectionSetupComplete message during connection estab
`lishment, as shown in FIG. 3, which is a message sequence
`chart for conventional MDT log reporting. Upon completion
`of an RRC connection establishment procedure, the mobile
`communication device indicates the availability of the MDT
`log in the RRCConnectionSetupComplete message (S300).
`The indicator may also be provided during a handover pro
`cedure, a re-establishment procedure, and an UTRANSRNC
`relocation procedure that involves a change from one serving
`RNC to another. In all cases, the mobile communication
`device includes the indication even though the logging period
`may not have ended. The RAN can decide to retrieve the
`MDT log based on the indication. In the case where the MDT
`log is retrieved before the completion of the pre-defined log
`ging duration, the MDT log can be deleted, but the Logged
`MDT measurement continues according to the Logged MDT
`configuration. The MDT log reporting is triggered by an
`on-demand mechanism, i.e. the mobile communication
`device is requested by the network to send the MDT log
`thereto Via RRC signaling e.g., UEInformationRequest mes
`sage (S302). In response to the MDT log request in the UEIn
`formationRequest message, the mobile communication
`device returns the MDT log in the UEInformationResponse
`message to the serving cell via Signaling Radio Bearer SRB2
`in the LTE network and via Signaling Radio Bearer SRB3 or
`SRB4 in the UMTS network (S304). Thereporting may occur
`in different cells other than the cell for which the Logged
`MDT configuration is signaled. The MDT log includes MDT
`measurements for the serving cell (e.g. the measurement
`quantity) and available UE measurements performed in idle
`for intra-frequency/inter-frequency/inter-RAT, time stamps
`and location information. The location information is based
`on available location information in the mobile communica
`tion device. Thus, the Logged MDT measurements are tagged
`by the mobile communication device with location data that
`includes an ECGI of the serving cell when the measurement
`was taken, GNSS location information if available in the
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`mobile communication device when the measurement was
`taken, and RF fingerprint information consisting of a PCI/
`PSC and RSRP/CPICH RSCP for up to 6 intra-frequency
`neighbor cells if the GNSS location information is not avail
`able when the measurement was taken.
`FIG. 4 is a message sequence chart of a Logged MDT
`reporting method exchanged between a mobile communica
`tion device and a radio access network (RAN) according to an
`embodiment of the invention. As the mobile communication
`device enters an RRC CONNECTED State and indicates that
`a MDT log is available in the RRCConnectionSetupComplete
`message in a connection establishment procedure (S400), the
`RAN initiates MDT log retrieval by issuing a request message
`UEInformationRequest to the mobile communication device
`(S402). In response to the request message, the communica
`tion module 100 (or 200) transmits the collected MDT log in
`a UEInformationResponse message to the RAN (S404). Dur
`ing transmitting the MDT log to the RAN, the control module
`102 (or 202) may continue to log MDT measurement accord
`ing to Logged MDT configuration. The reporting of the MDT
`log can occur in a different cell from which the Logged MDT
`configuration is received. During the transmission of the
`MDT log, the RAN may determine a necessity for handing
`over a network service from one cell to another based on a
`handover measurement report acquired from the mobile com
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`munication device. The RAN informs the mobile communi
`cation device of the occurrence of the event of the handover of
`the serving cell by a Handover message (S406). Upon receiv
`ing the Handover message the mobile communication device
`is informed that the serving cell has been changed from the
`current cell to a target cell (S410), and all ongoing data
`transmissions are to be transferred to the target cell after the
`handover procedure. Since the RAN does not receive the
`MDT log completely before the handover, the control module
`102 (or 202) keeps the MDT log in a memory component
`thereof. The control module 102 (or 202) terminates all ongo
`ing data sessions including the transmission of the MDT log
`during the handover procedure (S412), and controls the com
`munication module 100 (or 200) to send a Handover Com
`plete message to the target cell to signify the completion of
`40
`the handover (S414). After the handover, the control module
`102 (or 202) controls the communication module 100 (or
`200) to continue the transmission of the MDT log by sending
`a UEInformationResponse message to the RAN via the target
`cell (S416). The sending of the UEInformationResponse
`message may be triggered automatically or by a UEInforma
`tionRequest message received from the target cell. In one
`embodiment, the mobile communication device retransmits
`the entire MDT log to the RAN after the handover. In another
`embodiment, the mobile communication device resumes the
`transmission from the previous transmission by transmitting
`the remaining MDT log that has not yet been transmitted
`before the handover to the target cell. The RAN may collect
`and combine all parts of the MDT logs, and make appropriate
`adjustments to the cells according to the combined MDT log.
`After the MDT log is received by the RAN, the MDT log
`retrieval is completed, and the control module 102 (or 202)
`discards, clears, deletes, removes, or invalidates the MDT log
`stored therein. Please note that in the UMTS network, the
`message sequence chart can also be applied the case of SRNS
`relocation, which also causes a change of the serving cell. In
`the case of SRNS relocation procedure, the RAN sends a
`SRNS relocation message instead of Handover message in
`S408, the mobile communication device replies a SRNS relo
`cation complete message instead of Handover Complete mes
`sage in S414, and other parts of the message sequence remain
`similar to FIG. 4.
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`FIG. 5 is a message sequence chart of another Logged
`MDT reporting method according to an embodiment of the
`invention. In FIG. 5, the message sequence S500-S504 is
`similar to the message sequence S400-404 in FIG.4, and will
`not be described again here. During transmission of the MDT
`log, the mobile communication device may move to another
`cell in the radio access network. Based on the information
`broadcasted by the RAN, the control module 102 (or 202)
`determines that signal quality of the radio signals from the
`serving cell and neighbor cells and initiates a cell update
`procedure to change the serving cell from the current cell to a
`target cell that provides better signal quality (S506). Upon
`determining that a Switch has occurred to another cell as the
`serving cell, the control module 102 (or 202) terminates all
`data transmission including the transmission of the MDT log
`during the cell update procedure (S508) and forwards a Cell
`Update Request message to the RAN to inform the access
`network of the change in serving cell (S510). Since the RAN
`does not receive the MDT log completely before the cell
`update procedure, the control module 102 (or 202) keeps the
`MDT log in a memory component thereof. Upon reception of
`the Cell Update Request message, the RAN registers the
`changed serving cell and sends a Cell Update Confirm mes
`sage that may comprise a new Radio Network Temporary
`Identifier (RNTI) to the mobile communication device
`(S512) and completes the procedure. After the cell update
`procedure, the control module 102 (or 202) controls the com
`munication module 100 (or 200) to continue the transmission
`of the MDT log by sending a UEInformationResponse mes
`sage to the RAN via the target cell (S514). The sending of the
`UEInformationResponse message may be triggered auto
`matically or by a UEInformationRequest message received
`from the new serving cell. In one embodiment, the mobile
`communication device retransmits the entire MDT log in the
`memory component after the Switch to the target cell. In
`another embodiment, the mobile communication device
`resumes the transmission from the previous transmission by
`transmitting the remaining MDT log that has not yet been
`transmitted before the switch to the target cell. The RAN may
`collect and combine all parts of the MDT log, and make
`appropriate adjustments to the cells according to the com
`bined MDT log. After the MDT log is received by the RAN,
`the MDT log retrieval is completed, and the control module
`102 (or 202) discards, clears, deletes, removes, or invalidates
`the Logged MDT log stored therein.
`FIG. 6 is a flow chart depicting a Logged MDT reporting
`method 6 of a mobile communication device according to an
`embodiment of the invention. The embodiment of FIG. 6 can
`be implemented based on the message sequence chart of FIG.
`4 or FIG. 5. When entering a RAN, the mobile communica
`tion device initiates an RRC connection establishment proce
`dure and indicates availability of MDT log in the RRC sig
`naling RRCConnectionSetupComplete to the RAN (S600),
`which in turn may initiate MDT log retrieval using a UEIn
`formation Request message (S602). As a result, the mobile
`communication device transmits the Logged measurements
`in a UEInformationResponse message to the RAN via a serv
`ing cell through a logical channel or a signaling radio bearer
`(S604). The logical channel carries Non Access Stratum
`(NAS) messages that communicate between the mobile com
`munication device and a core network. In one embodiment of
`the invention, the mobile communication device assigns a
`higher priority to the NAS messages over the UEInformation
`Response message, so that the mobile communication device
`sends the NAS messages prior to the UEInformationRe
`sponse message whenever the NAS message is available.
`When the NAS message is available during a transmission of
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`the MDT log, the mobile communication device may suspend
`or stop the transmission of the MDT log, send the NAS
`message to the core network via the logical channel, then
`resume the transmission for the remaining MDT log or
`retransmit the complete MDT log to the RAN. When trans
`mitting the MDT log to the RAN, the mobile communication
`device may continue to log MDT measurements according to
`Logged MDT configuration. The reporting of the MDT log
`can occur in a different cell from which the Logged MDT
`configuration is received. During the transmission of the
`10
`MDT log the mobile communication device may have a
`change in the serving cell from one to another (S606). The
`serving cell connected to the mobile communication device
`may be changed due to a handover procedure, an UTRAN
`SRNS relocation procedure, or a cell update procedure as
`15
`described above. The change of the serving cell from one cell
`to another may be initiated by the RAN or the mobile com
`munication device. The mobile communication device termi
`nates all data transmission including the transmission of the
`MDT log if the change of the serving cell occurs (S608).
`Since the RAN does not receive the MDT log completely, the
`mobile communication device keeps the MDT log in a
`memory component thereof. Upon completion of the serving
`cell change (S610), the mobile communication device con
`tinues the transmission of the MDT log by sending a UEIn
`formationResponse message to the RAN via a new serving
`cell (S604). The sending of the UEInformationResponse
`message may be triggered automatically or by a UEInforma
`tionRequest message. In one embodiment, the mobile com
`munication device retransmits the entire MDT log. In another
`30
`embodiment, the mobile communication device resumes the
`transmission from the previous transmission by transmitting
`the remaining MDT log that has not yet been transmitted
`before the change to the new serving cell. The RAN may
`collect and combine all parts of the MDT log, and make
`35
`appropriate adjustments to the cells according to the com
`bined MDT log. After the whole MDT log is received by the
`RAN, t