I 1111111111111111 11111 lllll lllll lllll lllll lllll lllll lllll 111111111111111111
`US008798658B2
`
`02) United States Patent
`Persson et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 8,798,658 B2
`Aug. 5, 2014
`
`(54) MINIMIZING DRIVE TEST LOGGED DATA
`REPORTING
`
`(75)
`
`Inventors: Biikan Persson, Solna (SE); Henrik
`Enbuske, Stockholm (SE); Hakan
`Palm, Vaxjo (SE)
`
`(73) Assignee: Telefonaktiebolaget L M Ericsson
`(pub!), Stockholm (SE)
`
`( *)
`
`Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by O days.
`
`(21)
`
`Appl. No.:
`
`13/001,687
`
`(22)
`
`PCT Filed:
`
`Dec. 9, 2010
`
`(86)
`
`PCT No.:
`
`PCT/SE2010/051355
`
`§ 371 (c)(l),
`(2), ( 4) Date: Oct. 14, 2011
`
`PCT Pub. No.: WO2012/047141
`PCT Pub. Date: Apr. 12, 2012
`
`Prior Publication Data
`
`US 2013/0190031 Al
`
`Jul. 25, 2013
`
`(87)
`
`(65)
`
`Related U.S. Application Data
`
`(60)
`
`Provisional application No. 61/389,581, filed on Oct.
`4, 2010.
`
`(51)
`
`(52)
`
`(2006.0J)
`(2009.01)
`(2006.0J)
`
`Int.CI.
`H04B 7100
`H04W24/10
`G06F 11134
`U.S.Cl.
`CPC ............... H04W24/10 (2013.01); G06F 11/34
`(2013.01); H04B 7100 (2013.01)
`USPC ........ 455/517; 455/500; 455/423; 455/67.11;
`455/425; 455/426.1; 370/241; 370/252; 370/310;
`370/328; 370/343; 714/45; 714/25; 714/1
`
`(58) Field of Classification Search
`CPC ...................... ........ ........ ............... H04W 24/10
`USPC ................. 455/517, 500,507,514, 423-425,
`455/67. I 1, 445, 412.1, 4 12.2, 422.1, 403,
`455/522, 68, 69, 426. l, 426.2, 458, 453;
`370/24 1,252,31 0, 328, 329, 338, 343;
`7 J 4/45, 25, l
`See application file for complete search history.
`References Cited
`
`(56)
`
`U.S. PATENT DOCUMENTS
`
`2011/0276838 Al* 11/2011 Zhou et al . ................. 7 14/45
`OTHER PUBLICATIONS
`
`3GPP TS 37.320, 3rd Generation Partnership Project; Technical
`Specification Group Radio Access Network; Universal Terrestrial
`Radio Access (UTRA,) and Evolved Unive.rsaJ Terrestrial Radio
`Access (E-UTRA); Radio Meastu'ement Collection for Minimization
`of Drive Tests (MDT); Overall Description; Stage 2 (Release I 0),
`VI0.0.0, Dec. 2010.
`3GPP TR 36.805, 3rd Generation Partnership Project; Technical
`Specification Group Radio Access Network; Study on Minimization
`of Drive-Tests in Next Generation Networks (Release 9), V9.0.0,
`Dec. 2009.
`
`* cited by examiner
`Primary Examiner - Keith Ferguson
`(74) Attorney, Agent, or Firm - Baker Botts L.L.P.
`ABSTRACT
`(57)
`This disclosure pertains to a method in a network node, a
`method in user equipment, a network node and user equip(cid:173)
`ment in a wireless colllllltmications network. More particu(cid:173)
`larly, there is provided methods and platforms for network.
`based control of .report messages comprising logged mea(cid:173)
`surements in a wireless colllllltmications network. In accor(cid:173)
`dance with some example embodiments, a UE (30) that has
`stored logged data i.e. Jogged measurements that are bigger
`than a single transmission packet, i.e. report message, seg(cid:173)
`ments the logged measurements and sends only a portion of
`the Jogged measurements that fits into a single report mes(cid:173)
`sage. The UE (30) also indicates to a network node (28) that
`additional Jogged measurements exist at the UE buffer (44).
`30 Claims, 6 Drawing Sheets
`
`S62
`
`S64
`
`SU
`
`568
`
`Send reqtits-t lO the UE to start uansmining logged
`measurtments ia a report messa3C
`
`Receive the report message comprising the logged
`me.asurcments
`
`Decide iftbe nddition~l loggod mca.surement, need
`to be reque$led
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`Aug. 5, 2014
`
`Sheet 1 of 6
`
`US 8,798,658 B2
`
`30 UE
`
`28 Network node
`(eNB/RNC)
`
`1. Indicate available logged measurements
`
`2. Determine if the NW should
`request logged measurements
`
`3. Request logged measurements
`
`4. Deliver available logged measurements
`
`Fig. 1 (Prior art)
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`Aug. 5, 2014
`
`Sheet 2 of 6
`
`US 8,798,658 B2
`
`20 "\
`
`Network node
`
`Network node Processor circuit
`
`52
`
`Network node Communications Interface
`
`\
`
`(cid:127)
`
`32
`
`- (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) - (cid:127) -
`
`(cid:127) -
`
`(cid:127) - (cid:127) -
`
`(cid:127) -
`
`142 UE communications Interface
`
`40 UE processor circuit r-----------------------1
`: 40' MDT Log Reporter
`:
`L----------------------•
`.----------------------~
`UE buff er
`:
`: 44
`I ----------------------1
`Wireless Terminal (UE)
`
`Fig. 2
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`Aug. 5, 2014
`
`Sheet 3 of 6
`
`US 8,798,658 B2
`
`S62
`
`S64
`
`S66
`
`S68
`
`Send request to the UE to start transmitting logged
`
`measurements in a report message
`
`Receive the report message comprising the logged
`measurements
`
`message compnses an
`indicator of additional
`logged measurements not yet
`transmitted?
`
`YES
`
`Decide if the additional logged measurements need
`to be requested
`
`Fig. 3
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`Aug. 5, 2014
`
`Sheet 4 of 6
`
`US 8,798,658 B2
`
`S7 1
`
`Receive indication of existents of logged
`measurements that are available
`
`S72
`
`S74
`
`S76
`
`Send request to the UE to start transmitting logged
`
`measurements in a report message
`
`Receive the report message comprising the logged
`measurements
`
`indicator?
`
`NO
`
`S78
`
`YES
`
`S77
`
`Wait for
`indication S7 l
`
`Decide if the additional logged measurements need
`to be requested
`
`I
`I
`: S79
`I
`I
`I
`I
`
`Request all logged measurements
`
`·---------------------------------
`
`Fig. 4
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`Aug. 5, 2014
`
`Sheet 5 of 6
`
`US 8,798,658 B2
`
`S82
`
`Receive request from the network node to start
`transmitting logged measurements in a report
`message
`
`No
`
`Include in the report message an indicator of
`additional logged measurements not yet transmitted
`
`S86
`
`S88
`
`Transmit the report message, comprising the indicator,
`to the network node as a response to the request
`
`Fig. 5
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`Aug. 5, 2014
`
`Sheet 6 of 6
`
`US 8,798,658 B2
`
`S90
`
`Periodically perform radio condition measurements
`and store as logged measurements
`
`S9l
`r------------------- -----------------------'
`'---! Send indication of logged measurements available
`:
`'------------------- -----------------------·
`
`I
`
`S92
`
`I
`
`Receive request to start transmitting logged
`measurements in a report message
`
`S96
`
`No
`
`Include in the report message an indicator of
`additional logged measurements not yet transmitted,
`and a reporting time stamp
`
`S98
`
`Transmit the report message, including oldest logged
`measurements, to the network node as a response to the
`request
`
`S99
`
`Delete oldest logged measurements that are
`transmitted from UE buffer
`
`Fig. 6
`
`Samsung Ex. 1001
`
`

`

`US 8,798,658 B2
`
`1
`MINIMIZING DRIVE TEST LOGGED DATA
`REPORTING
`
`This application is the U.S. national phase oflnternational
`Application No. PCT/SE2010/051355, filed 9 Dec. 2010,
`which designated the U.S. and claims the benefit to U.S
`Provisional No. 61/389,581, filed 4 Oct. 2010, the entire
`contents of each of which are hereby incorporated by refer(cid:173)
`ence.
`
`TECHNICAL FIELD
`
`This disclosure pertains to a method in a network node, a
`method in user equipment, a network node and user equip(cid:173)
`ment in a wireless communications network. More particu(cid:173)
`larly, there is provided mechanisms for network based control
`of report messages comprising logged measurements in a
`wireless communications network.
`
`BACKGROUND
`
`In a typical cellular radio system, wireless terminals, also
`known as mobile stations and/or User Equipments units
`(UEs ), communicate via a Radio Access Network (RAN) to
`one or more core networks. The wireless terminals, hereinaf(cid:173)
`ter called UEs which is the same as User Equipments, can also
`be mobile telephones, i.e. "cellular" telephones, and laptops
`with wireless capability e.g., mobile termination, and thus
`are, for example, portable, pocket, hand-held, computer-in- 30
`eluded, or car-mounted mobile devices which communicate
`voice and/or data via the RAN.
`The RAN normally covers a geographical area which is
`divided into cell areas, also denoted cells, with each cell area
`being served by a base station e.g., a Radio Base Station
`(RBS), which in some networks is also called "NodeB" or "B
`node". A cell is a geographical area where radio coverage is
`provided by base station equipment at a base station site. Each
`cell is identified by an identity within the local radio area,
`which is broadcast in the cell. The base station communicates
`over the air interface operating on radio frequencies with the
`UEs within range of the base stations.
`In some versions, particularly earlier versions of the RAN,
`several base stations are typically connected, e.g., by land- 45
`lines or microwave, to a Radio Network Controller (RNC).
`The RNC, also sometimes termed a Base Station Controller
`(BSC), supervises and coordinates various activities of the
`plural base stations connected thereto. The radio network
`controllers are typically connected to one or more core net(cid:173)
`works.
`The Universal Mobile Telecommunications System
`(UMTS) is a third generation mobile communication system,
`which evolved from the Global System for Mobile Commu(cid:173)
`nications (GSM), and is intended to provide improved mobile
`communication services based on Wideband Code Division
`Multiple Access (WCDMA) access technology. UTRAN is
`essentially a radio access network using wideband code divi(cid:173)
`sion multiple access for user equipment units (UEs ). The
`Third Generation Partnership Project (3GPP) has undertaken
`to evolve further the UTRAN and GSM based radio access
`network technologies.
`Long Term Evolution (LTE) is a variant of a 3GPP radio
`access technology wherein the radio base station nodes are
`connected directly to a core network rather than to RNCs. In 65
`general, in LTE the functions of the RNC node are performed
`by the RBSs. As such, the RAN of an LTE system has an
`
`2
`essentially "flat" architecture compnsmg RBSs without
`reporting to RNCs. In LTE networks the base station(s) is/are
`called eNodeB(s) or eNB(s).
`3GPP is in the process of defining solutions for Minimizing
`5 Drive Tests (MDT). The intention of the Minimizing Drive
`Tests (MDT) work is documented in 3GPP TR 36.805 V9.0.0
`(2009-12), 3rd Generation Partnership Project; Technical
`Specification Group Radio Access Network; Study on Mini(cid:173)
`mization of drive-tests in Next Generation Networks (Release
`10 9).
`Stage 2 of Minimizing Drive Tests (MDT) is currently
`being developed in TS 37.320, i.e., 3GPP TS 37.320, "Radio
`measurement collection for Minimization of Drive Tests
`(MDT); Overall description; Stage 2". MDT Stage 2 includes
`15 a UE measurement logging function and immediate reporting
`function. The 3GPP TS 37 .320 document essentially focuses
`on the UE measurement logging function.
`An important use case for MDT is coverage optimization.
`For this purpose following UE measurements, or similar
`20 functionalities, are considered for VE-internal logging: Peri(cid:173)
`odic, e.g. one every 5 s, downlink pilot signal strength mea(cid:173)
`surements; a serving cell becomes worse than threshold;
`transmit power headroom becomes less than threshold; Pag(cid:173)
`ing Channel Failure i.e. Paging Control CHannel (PCCH)
`25 decode error; and Broadcast Channel failure.
`The network can request the UE to perform logging of
`measurements. The UE executes measurements and logs
`these measurements internally in a sequential manner, con(cid:173)
`taining, e.g., some hour oflogged measurement information.
`As described in FIG. 1, the UE indicates to the network if
`it has available log i.e. available logged measurements. The
`network node i.e. eNB/RNC determines if it should request
`the logged measurements or not. If it decides to do so then a
`request is sent to the UE to deliver the log in a report message.
`35 From the eNB/RNC, the reported logged measurements may
`further be sent to an OAM server or similar.
`The current 3GPP assumptions on this log (i.e. logged
`measurements) feature are, e.g., as follows: the UE is required
`to maintain only one log at a time; one log only contains
`40 measurement information collected in one Radio Access
`Technology (RAT); a log can only be reported and indicated
`when the UE is in connected state; IfUE is requested to start
`logging, e.g., by configuration, a possibly old log and con-
`figuration stored in UE is erased.
`What the logged measurement report message in signal
`number 4 in FIG. 1 should look like has not yet been decided,
`as of the filing of this application. Some proposals for man(cid:173)
`agement of measurement report have been proffered.
`As one example proposal for management of measurement
`50 reports, it has been suggested that a log i.e. logged measure(cid:173)
`ments, are to be sent in a single packet, and keeping that single
`packet within the size limits of a Packet Data Convergence
`Protocol (PDCP) Protocol Data Unit (PDU). Keeping the
`single packet within the size limits of a PDCP PDU makes it
`55 possible to use a Radio Resource Control RRC message for
`reporting without being segmented into several smaller pack(cid:173)
`ets before being sent to the receiving node i.e., the eNB or
`NB/RNC in LTE or UMTS, respectively. One option of this
`proposal would be limiting the maximum size of a log in a UE
`60 to one RRC message that fits into one PDCP payload packet.
`As another example proposal for management of measure(cid:173)
`ment reports, it has been suggested to send a log i.e. a logged
`measurement that is larger than a RRC message with several
`RRC messages.
`However, there are disadvantages to both example propos(cid:173)
`als mentioned above. For example, limiting the log size could
`prevent logging to complete for the whole configured run
`
`Samsung Ex. 1001
`
`

`

`US 8,798,658 B2
`
`5
`
`10
`
`4
`as logged measurements. The method comprising: receiving
`a request, in the UE, from the network node to start transmit(cid:173)
`ting logged measurements in a report message; determining if
`the logged measurements fit in the report message; and if not,
`including in the report message an indicator of additional
`logged measurements not yet transmitted; and, transmitting
`the report message, comprising the indicator, to the network
`node as a response to the request.
`In a fourth example of an embodiment, there is disclosed a
`User Equipment, UE, for assisting in a network based control
`of report messages in a wireless communications network.
`The UE is being in connection with a serving network node
`and is configured to transmit report messages to the network
`node. The UE is further configured to periodically perform
`radio condition measurements and store the periodically per-
`15 formed measurements in a buffer as logged measurements.
`The UE comprises a UE communications interface and a UE
`processor circuit. The UE communications interface is con(cid:173)
`figured to receive a request from the network node to start
`transmitting logged measurements in a report message, and to
`20 transmit the report message comprising the logged measure(cid:173)
`ments. The UE processor circuit is configured to determine if
`the logged measurements fits in the report message, and if not,
`indicating in the report message to be transmitted an existents
`of additional logged measurements not yet transmitted.
`An advantage achieved by some of the above mentioned
`embodiments is that due to use of indicator in report message
`of further remaining logged measurements providing the net(cid:173)
`work, i.e. a network node, with information needed to decide
`a timing of transmission of the logged measurements and a
`timing of when more logged measurements should be
`requested.
`Another advantage achieved by at least some of the above
`mentioned embodiments is to make it possible to have longer
`logging duration and/or conduct more frequent measure(cid:173)
`ments without overflow in log memory in UE e.g. UE buffer.
`Another advantage achieved by some of the above men(cid:173)
`tioned embodiments is to provide the network node with
`information about logged measurements making it possible
`to determine the amount of logged measurements kept in a
`UE.
`The foregoing and other objects, features, and advantages
`will become apparent from following more particular
`descriptions of preferred embodiments and aspects of
`embodiments as will be illustrated by accompanying draw(cid:173)
`ings in which reference characters refer to the same parts
`throughout various views.
`
`3
`time i.e. logging duration, which can be several hours. The log
`could fill the limited log buffer in the UE before any measure(cid:173)
`ment report has been possible to send to the network node.
`Before the configured logging duration time has ended, the
`UE would stop the logging so that to only allow the log size to
`be a single packet e.g. single RRC packet, and relevant mea(cid:173)
`surements reports may not thereafter be logged. Also in the
`current MDT configuration a start time for the logging is not
`configurable. This means that for a prolonged logging cam(cid:173)
`paign a long period between logging instances may be needed
`in the MDT configuration, alternatively new MDT configu(cid:173)
`ration needs to be provided from the OAM periodically to be
`conveyed to MDT capable UEs.
`For the other proposal, sending too many RRC packets in a
`row could, in poor radio environments or when handover
`would occur, create problems with the radio connections and
`could also create unnecessary radio link failures that will
`make the users suffer and logged data be lost.
`
`SUMMARY
`
`30
`
`The technology disclosed herein concerns network based
`control of report messages comprising logged measurements
`in a wireless communications network, which overcomes at
`least some of the above mentioned disadvantages and which 25
`allows multiple partial report messages to be sent.
`In accordance with some example embodiments, a UE that
`has stored logged data i.e. logged measurements that are
`bigger than a single transmission packet, i.e. report message,
`segments the data and sends only a portion of the data that fits
`into a single report message, and also indicates that more
`logged measurements exists at the UE.
`In a first example of embodiment, there is disclosed a
`method in a network node for network based control of report
`messages in a wireless communications network. The net- 35
`work node being configured to serve a user equipment, UE,
`and to receive report messages from the user equipment. The
`method comprises sending a request to the UE to start trans(cid:173)
`mitting logged measurements in a report message. The net(cid:173)
`work node then receives the report message comprising the 40
`logged measurements from the UE, and determines if the
`received report message comprises an indicator of additional
`logged measurements not yet transmitted, and if so, decides if
`the additional logged measurements need to be requested.
`In a second example of an embodiment there is disclosed a 45
`network node for network based control ofreport messages in
`a wireless communications network. The network node being
`configured to serve a user equipment, UE, and to receive
`report messages from the user equipment. The network node
`comprises a network node communications interface and a 50
`network node processor circuit. The network node commu(cid:173)
`nications interface being configured to send a request to the
`UE to start transmitting logged measurements in a report
`message, and to receive the report message comprising the
`logged measurements. The network node processor circuit 55
`being configured to determine if the received report message
`comprises an indicator of additional logged measurements
`not yet transmitted; and if so, to decide if the additional
`logged measurements need to be requested.
`In a third example of an embodiment, there is disclosed a 60
`method in a User Equipment, UE, for assisting in network
`based control of report messages in a wireless communica(cid:173)
`tions network. The UE is being in connection with a serving
`network node and configured to transmit report messages to
`the network node upon request. The UE is further configured 65
`to periodically perform radio condition measurements and
`store the periodically performed measurements in a UE buffer
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The drawings are not necessarily to scale, emphasis instead
`being placed upon illustrating principles of the disclosure.
`FIG. 1 is a signaling scheme illustrating how logged mea(cid:173)
`surements are reported according to prior art.
`FIG. 2 is a schematic block diagram illustrating example
`embodiments of a network node and a user equipment.
`FIG. 3 is a flowchart depicting an example embodiment of
`a method in a network node.
`FIG. 4 is a flowchart depicting further example embodi(cid:173)
`ments of a method in a network node.
`FIG. 5 is a flowchart depicting an example embodiment of
`a method in a user equipment.
`FIG. 6 is a flowchart depicting further example embodi(cid:173)
`ments of a method in a network node.
`
`DETAILED DESCRIPTION
`
`FIG. 2 illustrates portions of an example embodiment of a
`communications system/network, and particularly portions
`
`Samsung Ex. 1001
`
`

`

`US 8,798,658 B2
`
`5
`of a Radio Access Network (RAN) 20 comprising at least one
`network node 28 and a wireless terminal, hereinafter denoted
`User Equipment, (UE) 30. Depending on a particular type of
`RAN utilized and delegation of nodal responsibilities, the
`network node 28 may be a base station node e.g., an NodeB in 5
`UMTS or an eNodeB in Long Term Evolution (LTE)) or a
`Radio Network Controller (RNC) node in UMTS. Thus, the
`UE 30 communicates over radio interface 32 with the net(cid:173)
`work node 28, either directly over radio interface 32 with the
`network node 28 in case of the network node 28 being a base
`station type node, or over the radio interface 32 and through a
`base station in the case of the network node 28 being a radio
`network controller (RNC) node or an Mobility Management
`Entity (MME) which is a control node which processes sig(cid:173)
`naling between the UE and the Core Network (CN) and
`provides Visitor Location Register (VLR) functionality for
`the Evolved Packet System (EPS).
`As mentioned above, the UE 30 can be a mobile station
`such as a mobile telephone ("cellular" telephone) or laptop
`with wireless capability (e.g., mobile termination), and thus
`can be, for example, a portable, pocket, hand-held, computer(cid:173)
`included, or car-mounted mobile device which communi(cid:173)
`cates voice and/or data via radio access network.
`In accordance with one of its aspect, the technology dis(cid:173)
`closed concerns generation and/or transmission and/or use of
`multiple partial report messages with logged measurements
`such as MDT log packets, also denoted MDT log or MDT log
`data. As such, FIG. 2 shows an example embodiment of
`network node 28 or UE 30, which comprises a UE commu(cid:173)
`nication interface 42 and a UE processor circuit 40. Note that
`the UE may be seen as a serving point. The UE processor
`circuit may include a buffer 44, i.e. UE buffer, for storing
`logged measurements, not shown in figure, and in another
`embodiment the buffer 44 is within the UE 30.
`FIG. 2 also illustrates network node 28 as comprising a
`network node processor circuit 50 and network node commu(cid:173)
`nications interface 52 (i.e. a communications interface of the
`network node). The network node processor circuit 50 may
`be, or comprise, a logged measurements requestor/processor
`(not shown in figure) to be used for requesting logged mea(cid:173)
`surements, such as MDT log, in report message(s ).
`According to one example of an embodiment, the network
`node 28 is used for network based control of report messages
`comprising logged measurements in a wireless communica(cid:173)
`tions network, the network node 28 being configured to serve
`the UE 30, UE, and to receive report messages from the UE
`30.
`Continuing with the description of FIG. 2, the network
`node communications interface 52 is, or may be, configured
`to send request(s) to the UE 30 to start transmitting logged
`measurement(s) in report message(s), and to receive the
`report message(s) comprising the logged measurements. The
`logged measurements may comprise one or more of the fol(cid:173)
`lowing: measurement time stamps for each performed mea(cid:173)
`surement; UE buffer state condition; positioning information
`ofUE; periodically measured downlink pilot signal strength;
`serving cell conditions; transmit power headroom conditions;
`paging channel failure(s); maximum required memory sup(cid:173)
`ported by UE; and broadcast channel failure(s).
`According to one embodiment, the network node commu(cid:173)
`nications interface 52 may be configured to receive, from the
`UE 30, an indication of existents ofloggedmeasurements that
`are available. Note, that the "additional logged measure(cid:173)
`ments" indicator is conveyed in the UE information report 65
`message while the indication oflogged measurements avail(cid:173)
`able is conveyed in already existing/specified signaling.
`
`6
`According to one embodiment, the network node commu(cid:173)
`nications interface 52 may be configured to request the report
`message(s) directly from the UE 30 or from another network
`node, e.g. RNC, MME, RBS or other similar node.
`According to one embodiment, the network node commu-
`nications interface 52 may be configured to request the report
`message upon receiving a UE access request initiated by a UE
`handover procedure from another network node to the net(cid:173)
`work node. The request may for example be a RRC connec-
`10 tion request. The network node communications interface 52
`may also be configured to receive a network node message
`from the other network node i.e. another eNodeB, RNC or
`RBS, comprising UE specific information. The UE specific
`information may further comprise the indicator indicating
`15 additional logged measurements not yet transmitted.
`The network node processor circuit 50, mentioned above in
`relation to FIG. 2, is configured to determine if the received
`report message(s) comprises an indicatorof additional logged
`measurement( s) not yet transmitted; and if so, to decide if the
`20 additional logged measurements need to be requested.
`According to one embodiment, the network node processor
`circuit 50 may be configured to decide if the additional logged
`measurements need to be requested based on one or more of
`the following: interference level experienced in a cell; radio
`25 condition measurements experienced in a cell; available radio
`resource; network node capacity; UE buffer state condition
`etc.
`According to one embodiment, the network node proces(cid:173)
`sor circuit 50 may be configured to determine if the indicator
`30 indicates that there are logged measurements in a UE buffer
`44 that do, or do not, fit in a single subsequent report message.
`According to one embodiment, the network node proces(cid:173)
`sor circuit 50 may be configured to decide to request all the
`logged measurements in the buffer 44 of the UE in one sub-
`35 sequent request, or repeatedly upon receiving each report
`message. The decision may also be based on received status
`information of the buffer 44 in the UE 30 being for example
`overloaded. Note that configured to or adapted to in relation to
`functionality of circuits and devices mentioned above and
`40 throughout the whole disclosure are expressions that may be
`used having a similar or same meaning.
`It should be appreciated that the network node processor
`circuit 50 may comprise an MDT log requestor/processor 50'
`(not shown in FIG. 2) which may be implemented in platform
`45 fashion, e.g., implemented by a computer/processor execut(cid:173)
`ing instructions of non-transient signals and/or by a circuit.
`Likewise from a UE perspective, reference made to FIG. 2,
`the UE 30 may be, or is, used for assisting in network based
`control of report messages comprising logged measurements
`50 in a wireless communications network. The UE 30 is being in
`connection with the serving network node 28 and is config(cid:173)
`ured to transmit report message(s) to the network node 30.
`The UE 30 may further be configured to periodically perform
`radio condition measurements and store the periodically per-
`55 formed measurements in the buffer 44 as logged measure(cid:173)
`ments. Such logged measurements may be MDT log reports.
`The UE communications interface 42 mentioned above in
`relation to FIG. 2, is configured to receive a request from the
`network node 28 to start transmitting logged measurements in
`60 report message(s ), and to transmit/send the report message(s)
`comprising the logged measurements. The UE processor cir(cid:173)
`cuit 40 is configured to determine if the logged measurements
`fits in the report message( s ), and if not, indicating in the report
`message to be transmitted an existents of additional logged
`measurements not yet transmitted.
`According to one embodiment of an example implemen(cid:173)
`tation ofa UE 30 in which the UE processor circuit 40 may be,
`
`Samsung Ex. 1001
`
`

`

`US 8,798,658 B2
`
`7
`or may comprise, a multiple partial MDT log reporter 40'
`(FIG. 2 dashed lines). The multiple partial MDT log reporter
`40' may comprise a log report generator and data logging unit
`(not shown in FIG. 2). The multiple partial MDT log reporter
`40' works in conjunction with a measurement unit (not shown 5
`in FIG. 2 ), and stores records of measurements in data logging
`unit. The log report generator may further comprise a packet
`identifier generator and "more data" i.e. additional data, flag
`generator.
`The technology disclosed above, and in relation to some of 10
`the earlier mentioned embodiments, includes support for
`logged measurements, or an MDT log size, which exceeds a
`maximum size of the report message which may for example
`be a Packet Data Convergence Protocol (PDCP) packet. The
`technology disclosed herein also introduces and provides an 15
`indication from the UE 30 of additional logged measurements
`or MDT log data that remains in the UE buffer 44. In accor(cid:173)
`dance with some example embodiments, a UE 30 that has
`stored logged measurements, sometimes denoted logged
`data, that are bigger than a single report message i.e. trans- 20
`mission packet, segments the logged measurements, and
`sends only a portion of the logged measurements that fits into
`a single report message. The UE 30 also indicates that more
`logged measurements exist at the UE 30 in the buffer 44. This
`indication of further remaining logged measurements allows 25
`the network node 28 to decide a timing of transmission of the
`logged measurements and a timing of when more logged
`measurements should be requested. This may for example
`depend on radio condition measurements or UE buffer status
`information.
`The UE 30 will take a part of the logged measurements and
`put into the payload of the report message. The UE 30 will, if
`more logged measurements are still available, set a "more" or
`"additional" bit indicating to the network node 28, or by other
`means indicate to the network node 28, that there are more 35
`logged measurements available in the UE 30. The network
`node 28 will then, when it believes more data should be
`obtained e.g. based on: interference level experienced in a
`cell; radio condition measurements experienced in a cell;
`available radio resource; network node capacity; UE buffer 40
`state condition etc., request more logged measurements.
`When a request is done then the process may be repeated. A
`new decision may be taken after a new report message is
`received, and so on. In other words, upon reception of indi(cid:173)
`cation from UE, the network node 28 takes a decision (based 45
`on current radio conditions, node capacity) whether the net(cid:173)
`work node 28 shall request more logged measurements
`"data" from the UE now or request it at a later point in time.
`This "later point in time" could be predefined e.g. 15 slater. In
`one example an internal algorithm may for instance check to 50
`see if no Hand Over (HO) is imminent or other more vital
`procedure is at hand. The report messages may be lost if
`unsuccessfully reporting happens just before a HO. In one
`example, the network node 28 may be configured to continue
`requesting reporting oflogge