ao) United States
`a2) Patent Application Publication co) Pub. No.: US 2012/0149430 Al
`Siominaetal
`43) Pub. Date
`Jun. 14, 2012
`iomi
`.
`ub.
`.
`
`US 20120149430AI
`
`(54) USER EQUIPMENT, NETWORK NODE AND
`METHODS MAEREIN
`Inventors:
`[ana Siomina, Solna (SE); Tao
`Cui, Upplands Vasby (SE):
`Muhammad Kazmi, Bromma (SE)
`
`(75)
`
`Related U.S. Application Data
`(60) Provisional application No. 61/374,037, filed on Aug.
`16, 2010.
`
`Publication Classification
`
`(51)
`
`Int. Cl.
`HO4W 36/00
`
`(2009.01)
`
`
`a2) Patent Application Publication co) Pub. No.: US 2012/0149430 Al
`Siominaetal
`43) Pub. Date
`Jun. 14, 2012
`iomi
`.
`ub.
`.
`
`US 20120149430AI
`
`(54) USER EQUIPMENT, NETWORK NODE AND
`METHODS MAEREIN
`Inventors:
`[ana Siomina, Solna (SE); Tao
`Cui, Upplands Vasby (SE):
`Muhammad Kazmi, Bromma (SE)
`
`(75)
`
`Related U.S. Application Data
`(60) Provisional application No. 61/374,037, filed on Aug.
`16, 2010.
`
`Publication Classification
`
`(51)
`
`Int. Cl.
`HO4W 36/00
`
`(2009.01)
`
`
`
`Patent Application Publication
`
`Jun. 14,2012 Sheet 1 of 7
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`US 2012/0149430 Al
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`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`USER EQUIPMENT, NETWORK NODE AND
`METHODS THEREIN
`
`TECHNICAL FIELD
`
`[0001] Embodiments herein relate to a user equipment, a
`network node, and methods therein. In particular, embodi-
`ments herein relate to handle cell change in a radio commu-
`nications network.
`
`corresponding geographical description of the serving cell,
`the ‘Timing Advance (TA) of the serving cell, and the CIDs
`and the corresponding signal measurements ofthe cells, up to
`32 cells in LTE, including the serving cell, as well as Angle of
`Arrival (AoA) measurements. The following UE measure-
`ments may be utilized for E-CID in LIE: evolved UMTS
`Terrestrial Radio Access Network (E-UTRAN) carrier
`Received Signal Strength Indicator (RSSI), Reference Signal
`Received Power (RSRP); Reference Signal Recerved Quality
`
`
`
`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`the Physical Cell Identity (PCI), may be applied to the speci-
`fied PRS patterns to generate orthogonal patterns and mod-
`elling the effective frequency reuse of six patterns, which
`makesit possible to significantly reduce neighbourcell inter-
`ference on the measured PRS and thus improve a positioning
`measurement. Even though PRSs have been specifically
`designed for a positioning measurement and in general are
`characterized by better signal quality than other reference
`signals, the standard does not mandate using the PRSs. Other
`
`[0014] According to an aspect the object 1s achieved by a
`method in a user equipment for handling cell change ina radio
`communications network. The user equipment 1s served byat
`least a first cell controlled by a radio network node. The user
`equipmentis to perform a cell change processto a second cell
`and a positioning session of the user equipment, and the user
`equipment postpones one ofthe positioning session and the
`cell change processrelative one another.
`[0015] According to another aspect the object 1s achieved
`
`
`
`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`wide Interoperability for Microwave Access (WiMax), or
`Ultra Mobile Broadband (UMB), network just to mention a
`few possible implementations. The radio communications
`network comprises a radio network node, such asa first radio
`base station 12, providing radio coverage over at least one
`geographical area forming a first cell 11. A user equipment 10
`is served in the first cell 11 by the first radio base station 12
`and 1s communicating with thefirst radio base station 12. The
`first cell 11 1s thus a serving cell to the user equipment 10 in
`
`measurement. This will cause severe ambiguity in the mea-
`surement results, which in turn will translate into the deter-
`mination of the position of the user equipment 10 with large
`uncertainty. Additionally,
`the positioning node 17 may
`receive information, e.g. from another network node, that the
`serving cell has changed for the user equipment 10, whilst the
`positioning node 17 still receives and processes the measure-
`ment at least partially based on measuring signals in thefirst
`cell 11. In either case,the final position ofthe user equipment
`
`
`
`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`FIG. 2 is a schematic combined flowchart andsig-
`[0034]
`nalling scheme ina radio communications network. The steps
`do not have to be taken 1n the order stated below, but may be
`taken in any suitable order.
`[0035]
`Step 201. Each radio base station 12,13,15 broad-
`casts and transmits reference signals carrying System Infor-
`mation (SI) or similar providing radio coverage over geo-
`eraphical areas. The user equipment 10 is served 1n thefirst
`cell 11 but moves towards the second cell 14, and continu-
`
`RAT's or frequencies. A positioning session may be postponed
`depending on the combination ofthe factors above. An indi-
`cator of the delay or stop, or an abort or failure message may
`be sent to the first radio base station 12 when the positioning
`session 1s stopped or delayed. Also, when a positioning mea-
`surement session has been delayed, an indication of this and
`possible also the reason may besent by the user equipment10
`to the network e.g. the positioning node 17.
`[0041]
`Step 206. The user equipment 10 may finalize the
`
`
`
`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`spond to the end ofthe on-going positioning session. The user
`equipment 10 may also postponethe cell change process only
`for a specific positioning session e.g. based on type of posi-
`tioning technique such as E-CID. In some embodiments the
`user equipment may postpone the cell change for specific
`positioning measurements, e.g. UE Rx-Tx time difference;
`and/or for a certain type ofpositioning services e.g. when the
`on-going positioning session is related to the emergency
`
`session of the user equipment 10, postpones one ofthe posi-
`tioning session and the cell change process relative one
`another.
`Insome embodiments whenthe cell change process
`[0058]
`is on-going, the user equipment postpones the positioning
`session until the cell change process 1s over. The positioning,
`session may comprise a measurementprocedureforposition-
`ing and a measurement reporting, and the postponing of the
`positioning session may compriseto delay at least one of the
`
`
`
`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`Step 406. The user equipment 10 may then send,
`[0065]
`when the second cell 14 is not in the positioning assistance
`data, a request for the positioning assistance data of the sec-
`ond cell 14 only to the positioning node 17. Hence, at han-
`dover (HO), the user equipment 10 actually recerves the PCI
`and earfcn of the new cell in the handover command. So,
`according to some embodiments, the user equipment 10 may
`be able to know whetherit should request new positioning,
`
`‘inter-frequency handover’ indicator. The user equipment 10
`may also send a descriptive abort messageto a network node,
`e.g. the positioning node 17.
`[0070] At HO, the user equipment 10 actually receives the
`PCI and earfcn of the second cell 14 in a HO command.So,
`according to some embodiments, the user equipment 10 is
`able to know whether the user equipment 10 should request
`for new positioning assistancedata or not. If the new serving
`cell, 1.e. the second cell 14, is not in the previous positioning
`
`
`
`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`when performing the cell change process and the positioning,
`session of the user equipment 10. In some embodiments the
`cell change process may be on-going, and the postponing
`circuit 501 is configured to postpone the positioning session
`until the cell change process 1s over. In some embodiments,
`the positioning session comprises a measurement procedure
`for positioning measurement, and the postponing circuit 501
`is configured to postpone the positioning session by delaying
`the measurement procedure. In some embodiments when the
`
`equipment 10 is not capable of measuring on that different
`frequency band without measurement gaps.
`[0083]
`In some embodiments the user equipment 10 is
`arranged to change from thefirst cell 11 to the second cell 14.
`The user equipment 10 may further comprise a restarting
`circuit 507 configured to restart performing Rx-Tx measure-
`ments on the second cell 14 after the cell change processto the
`second cell 14.
`[0084] The user equipment 10 may furthermore comprise a
`
`
`
`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`this is only performed whenthe positioning session 1s of low
`priority e.g. if it is not an emergencycall. This may in some
`embodiments be performed based on a type ofthe cell change
`process. For example, the positioning node 17 may delay the
`initiation ofthe positioning session for the user equipment10
`during the cell change procedure, e.g. a handover procedure,
`depending upon the type of cell change. E.g. the positioning
`node 17 may delay the initiation of the positioning session
`provided if it 1s an intra-frequency handover. On the other
`
`data is signalled by the positioning node 17 to the user equip-
`ment 10 for performing the positioning measurements. There
`may be different ways of obtaining the serving cell informa-
`tion by the positioning node 17.
`[0100]
`It should be understood that in some embodiments
`the positioning node 17 may obtain the information about the
`serving cell of the user equipment 10 from different sources/
`nodes. The information of the serving cell may correspond to
`the; present serving cell ofthe user equipment10; serving cell
`
`
`
`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`sified as non-reliable, e.g. it has low quality or some indica-
`tion has been received, e.g. missing quality metric in the
`measurementreport or recetved HO-occurred indicator from
`either a network node or the user equipment 10, or is not
`received in the measurement report while being requested.
`The positioning node 17 mayalso have a possibility to request
`Type 1 and Type 2 TA measurements and with these deduce
`the UE Rx-Tx measurement.
`[0103] Embodiments herein provide a smooth cell change
`
`request from a radio network node 12,13 serving the user
`equipment 10, Rx-Tx measurement from the user equipment
`10 when received Rx-Tx measurement 1s classified as non-
`reliable or 1s not receivedatall.
`[0112] The network node may be represented by the posi-
`tioning node 17. In addition, the network node may berepre-
`sented by the core network node and then the delaying circuit
`701 may be configured to delay the initiation of the position-
`ing session be delaying a transmission of a positioning
`
`
`
`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`the user equipment, postponing comprises postponing the
`cell change processa first time period.
`60. The method of claim 59, wherein thefirst time period1s
`pre-defined or configured by a positioning node, or corre-
`sponds to an end of the on-going positioning session.
`61. The method of claim 59, further comprising dropping
`the on-going positioning session or a measurement process
`for a specific positioning method.
`62. The method of claim 35, wherein postponing 1s per-
`
`72. A method in a network nodeof handling cell change of
`a user equipment between cells in a radio communication
`network, which user equipmentis served 1n a first cell con-
`trolled by the network node, the method comprising:
`delaying an initiation of a positioning session for the user
`equipmentif there 1s an on-going cell change process of
`the user equipment.
`73. The method of claim 72, further comprising sending a
`positioning request to the user equipmentafter the cell change
`
`
`
`US 2012/0149430 Al
`
`Jun. 14, 2012
`
`received by the user equipment, the postponing circuit 1s
`configured to postpone the cell change process a first time
`period.
`87. The user equipment of claim 86, wherein the first time
`period is pre-defined or configured by a positioning node,or
`corresponds to an end of the on-going positioning session.
`88. The user equipment of claim 86, further comprising a
`dropping circuit configured to drop the on-going positioning
`session or a measurement process for a specific positioning
`
`96. The user equipmentof claim 82, wherein thefirst cell is
`a serving cell and the second cell is a neighbor cell before the
`cell change process.
`97. The user equipmentof claim 82, wherein thefirst cell is
`a primary cell and the second cell is a secondary cell in a
`multi-carrier system.
`98. The user equipment of claim 82, wherein the cell
`change process is a handoverprocess, a cell reselection pro-
`cess, or a primary cell change.
`
`
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