WO2014161604A1 - Resélections de cellules sans notification au réseau - Google Patents

Resélections de cellules sans notification au réseau Download PDF

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Publication number
WO2014161604A1
WO2014161604A1 PCT/EP2013/057236 EP2013057236W WO2014161604A1 WO 2014161604 A1 WO2014161604 A1 WO 2014161604A1 EP 2013057236 W EP2013057236 W EP 2013057236W WO 2014161604 A1 WO2014161604 A1 WO 2014161604A1
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WO
WIPO (PCT)
Prior art keywords
communication device
cell
cells
access network
period
Prior art date
Application number
PCT/EP2013/057236
Other languages
English (en)
Inventor
Alexander Sayenko
Bindhya Vashini Tiwari
Sheyam Lal Dhomeja
Guillaume DECARREAU
Jing He
Original Assignee
Nokia Solutions And Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Solutions And Networks Oy filed Critical Nokia Solutions And Networks Oy
Priority to PCT/EP2013/057236 priority Critical patent/WO2014161604A1/fr
Priority to EP13714311.1A priority patent/EP2982182A1/fr
Publication of WO2014161604A1 publication Critical patent/WO2014161604A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the operation of a radio access network typically involves one or more mobile communica- tion devices making cell reselections as they move within the overall coverage area of the radio access network.
  • communication devices in some reduced states of activity may not notify the radio access network of some cell reselections.
  • a method comprising: controlling a radio receiver or radio transceiver of a communication device to receive via a first cell of a predefined collection of cells of a radio access network at least one device identifier for said communication device, wherein said at least one device identifier is specific to said first cell; switching said commu- nication device to a state in which, for a period of time, said communication device refrains from informing said radio access network of a cell reselection to any cell within said predefined collection of cells; and controlling the continued storage of said at least one device identifier at said communication device for at least said period of time.
  • the method comprises controlling the continued storage of said at least one device identifier after a cell reselection from said first cell to a second cell of said predefined collection of cells.
  • said period of time is a period of time for which there is no data to be transmitted between said communication device and radio access network in either direction.
  • said at least one device identifier includes an identifier required by said first communication device for receiving one or more messages on a dedicated control channel.
  • a method comprising: allocating at least one device identifier to a first communication device served by a first cell of a predefined collection of cells of a radio network, wherein said at least one device identifier is specific to said first cell; controlling one or more radio transmitters or transceivers to transmit a signal indicating an instruction for said first communication device to switch to a state in which, for a period of time, said radio access network is uninformed of any cell reselection by said first communication de- vice to any cell within said predefined collection of cells; and refraining from allocating said at least one device identifier to any other communication device for said period of time that said radio access network remains uninformed of any cell reselection by said first communication device to any cell within said predefined collection of cells.
  • said period of time is a period of time for which there is no data to be transmitted between said communication device and radio access network in either direction.
  • said at least one device identifier is an identifier required by said first communication device for receiving one or more messages on a dedicated control channel.
  • a method comprising: controlling one or more radio transmitters or transceivers of a radio access network to transmit to a communication device an instruction to switch to a first state in which, for a period of time, said radio access network is uninformed of any cell reselection by said communication device to any cell within a predefined collection of cells; and controlling one or more radio transmitters or transceivers of said radio access network to transmit a reconfiguration message for said communication device in said first state on one or more control channels of one or more cells belonging to said predefined collection of cells.
  • the method comprises: controlling one or more radio transmitters or transceivers to transmit a second message for said communication device in said first state on paging control channels of all cells belonging to said predefined collection of cells; and controlling one or more radio transmitters or transceivers to transmit said reconfiguration message for said communication device in said first state on one or more control channels of one or more selected cells of said predefined collection of cells.
  • said second message includes information about the trans- mission of said reconfiguration message.
  • said one or more selected cells includes a cell in which the radio access network most recently received a transmission from the communication device.
  • the method comprises controlling one or more radio transmitters or transceivers to transmit said reconfiguration message for said communication device in said first state solely on a dedicated control channel of the cell for which the radio access network most recently allocated to said communication device a device identifier of a type required by said communication to receive one or more messages on a dedicated control channel.
  • said one or more control channels comprise a common con- trol channel and/or a dedicated control channel.
  • the method comprises comprising controlling one or more radio transmitters or transceivers to make one or more broadcasts identifying one or more channelization codes required for receiving said reconfiguration message on one or more common control channels of one or more cells belonging to said predefined collection of cells.
  • said period of time is a period of time for which there is no data to be transmitted between said communication device and radio access network in either direction.
  • a method comprising: controlling a communication device to switch to a first state in which, for a period of time, said communication device does not inform a radio access network of any cell reselection by said communication device to any cell within a predefined collection of cells; and controlling a radio receiver or transceiver of said communication device to receive in said first state a reconfiguration message on a control channel of one or more cells belonging to said predefined collection of cells.
  • the method further comprises: controlling said radio receiver or transceiver to receive in said first state a second message for said communication device on a paging control channel; wherein said second message includes information about the transmission of said reconfiguration message.
  • said one or more control channels comprise a common con- trol channel and/or a dedicated control channel.
  • the method further comprises: controlling said radio receiver or transceiver to receive one or more messages identifying one or more channelization codes required for receiving said reconfiguration message.
  • said period of time is a period of time for which there is no data to be transmitted between said communication device and radio access network in either direction.
  • an apparatus comprising: a processor and memory including computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus to: control a radio receiver or radio transceiver of a communication device to receive via a first cell of a predefined collection of cells of a radio access network at least one device identifier for said communication device, wherein said at least one device identifier is specific to said first cell; switch said communication device to a state in which, for a period of time, said communication device refrains from informing said radio access network of a cell reselection to any cell within said predefined collection of cells; and control the continued storage of said at least one device identifier at said communication device for at least said period of time.
  • the memory and computer program code are further configured to, with the processor, cause the apparatus to: control the continued storage of said at least one device identifier after a cell reselection from said first cell to a second cell of said predefined collection of cells.
  • said period of time is a period of time for which there is no data to be transmitted between said communication device and radio access network in either direction.
  • said at least one device identifier includes an identifier re- quired by said first communication device for receiving one or more messages on a dedicated control channel.
  • an apparatus comprising: a processor and memory including computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus to: allocate at least one device identifier to a first communication device served by a first cell of a predefined collection of cells of a radio network, wherein said at least one device identifier is specific to said first cell; control one or more radio transmitters or transceivers to transmit a signal indicating an instruction for said first communication device to switch to a state in which, for a period of time, said radio access network is uninformed of any cell reselection by said first communication device to any cell within said predefined collection of cells; and refrain from allocating said at least one device identifier to any other communication device for said period of time that said radio access network remains uninformed of any cell reselection by said first communication device to any cell within said predefined collection of cells.
  • said period of time is a period of time for which there is no data to be transmitted between said communication device and radio access network in either direction.
  • said at least one device identifier is an identifier required by said first communication device for receiving one or more messages on a dedicated control channel.
  • an apparatus comprising: a processor and memory including computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus to: control one or more radio transmitters or transceivers of a radio access network to transmit to a communication device an instruction to switch to a first state in which, for a period of time, said radio access network is uninformed of any cell reselection by said communication device to any cell within a predefined collection of cells; and control one or more radio transmitters or transceivers of said radio access network to transmit a reconfiguration message for said communication device in said first state on one or more control channels of one or more cells belonging to said predefined collection of cells.
  • the memory and computer program code are further configured to, with the processor, cause the apparatus to: control one or more radio transmitters or transceivers to transmit a second message for said communication device in said first state on paging control channels of all cells belonging to said predefined collection of cells; and control one or more radio transmitters or transceivers to transmit said reconfiguration mes- sage for said communication device in said first state on one or more control channels of one or more selected cells of said predefined collection of cells.
  • said second message includes information about the transmission of said reconfiguration message.
  • said one or more selected cells includes a cell in which the radio access network most recently received a transmission from the communication device.
  • the memory and computer program code are further configured to, with the processor, cause the apparatus to: control one or more radio transmitters or transceivers to transmit said reconfiguration message for said communication device in said first state solely on a dedicated control channel of the cell for which the radio access network most recently allocated to said communication device a device identifier of a type required by said communication to receive one or more messages on a dedicated control channel.
  • said one or more control channels comprise a common control channel and/or a dedicated control channel.
  • the memory and computer program code are further configured to, with the processor, cause the apparatus to: control one or more radio transmitters or transceivers to make one or more broadcasts identifying one or more channelization codes required for receiving said reconfiguration message on one or more common control channels of one or more cells belonging to said predefined collection of cells.
  • said period of time is a period of time for which there is no data to be transmitted between said communication device and radio access network in either direction.
  • an apparatus comprising: a processor and memory including computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus to: control a communication device to switch to a first state in which, for a period of time, said communication device does not inform a radio access network of any cell reselection by said communication device to any cell within a predefined collection of cells; and control a radio receiver or transceiver of said communica- tion device to receive in said first state a reconfiguration message on a control channel of one or more cells belonging to said predefined collection of cells.
  • the memory and computer program code are further configured to, with the processor, cause the apparatus to: control said radio receiver or transceiver to receive in said first state a second message for said communication device on a paging control channel; wherein said second message includes information about the transmission of said reconfiguration message.
  • said one or more control channels comprise a common control channel and/or a dedicated control channel.
  • the memory and computer program code are further config- ured to, with the processor, cause the apparatus to: control said radio receiver or transceiver to receive one or more messages identifying one or more channelization codes required for receiving said reconfiguration message.
  • said period of time is a period of time for which there is no data to be transmitted between said communication device and radio access network in ei- ther direction.
  • an apparatus comprising: means for controlling a radio receiver or radio transceiver of a communication device to receive via a first cell of a predefined collection of cells of a radio access network at least one device identifier for said communication device, wherein said at least one device identifier is specific to said first cell; means for switching said communication device to a state in which, for a period of time, said communication device refrains from informing said radio access network of a cell reselection to any cell within said predefined collection of cells; and means for controlling the continued storage of said at least one device identifier at said communication device for at least said period of time.
  • an apparatus comprising: means for allocating at least one device identifier to a first communication device served by a first cell of a predefined collection of cells of a radio network, wherein said at least one device identifier is specific to said first cell; means for controlling one or more radio transmitters or transceivers to transmit a signal indicating an instruction for said first communication device to switch to a state in which, for a period of time, said radio access network is uninformed of any cell reselection by said first communication device to any cell within said predefined collection of cells; and means for refraining from allocating said at least one device identifier to any other communication device for said period of time that said radio access network remains uninformed of any cell reselection by said first communication device to any cell within said predefined col- lection of cells.
  • an apparatus comprising: means for controlling one or more radio transmitters or transceivers of a radio access network to transmit to a communication device an instruction to switch to a first state in which, for a period of time, said radio access network is uninformed of any cell reselection by said communication device to any cell within a predefined collection of cells; and means for controlling one or more radio transmitters or transceivers of said radio access network to transmit a reconfiguration message for said communication device in said first state on one or more control channels of one or more cells belonging to said predefined collection of cells.
  • an apparatus comprising: means for controlling a communica- tion device to switch to a first state in which, for a period of time, said communication device does not inform a radio access network of any cell reselection by said communication device to any cell within a predefined collection of cells; and means for controlling a radio receiver or transceiver of said communication device to receive in said first state a reconfiguration message on a control channel of one or more cells belonging to said predefined collection of cells.
  • a computer program product comprising program code means which when loaded into a computer controls the computer to: control a radio receiver or radio transceiver of a communication device to receive via a first cell of a predefined collection of cells of a radio access network at least one device identifier for said communication device, wherein said at least one device identifier is specific to said first cell; switch said communication device to a state in which, for a period of time, said communication device refrains from informing said radio access network of a cell reselection to any cell within said predefined collection of cells; and control the continued storage of said at least one device identifier at said communication device for at least said period of time.
  • a computer program product comprising program code means which when loaded into a computer controls the computer to: allocate at least one device identifier to a first communication device served by a first cell of a predefined collection of cells of a radio network, wherein said at least one device identifier is specific to said first cell; control one or more radio transmitters or transceivers to transmit a signal indicating an instruction for said first communication device to switch to a state in which, for a period of time, said radio access network is uninformed of any cell reselection by said first communication device to any cell within said predefined collection of cells; and refrain from allocating said at least one device identifier to any other communication device for said period of time that said radio access network remains uninformed of any cell reselection by said first communication device to any cell within said predefined collection of cells.
  • a computer program product comprising program code means which when loaded into a computer controls the computer to: control one or more radio transmitters or transceivers of a radio access network to transmit to a communication device an instruction to switch to a first state in which, for a period of time, said radio access network is uninformed of any cell reselection by said communication device to any cell within a predefined collection of cells; and control one or more radio transmitters or transceivers of said radio access network to transmit a reconfiguration message for said communication device in said first state on one or more control channels of one or more cells belonging to said predefined collection of cells.
  • a computer program product comprising program code means which when loaded into a computer controls the computer to: control a communication de- vice to switch to a first state in which, for a period of time, said communication device does not inform a radio access network of any cell reselection by said communication device to any cell within a predefined collection of cells; and control a radio receiver or transceiver of said communication device to receive in said first state a reconfiguration message on a control channel of one or more cells belonging to said predefined collection of cells.
  • Figure 1 illustrates an example of a radio access network in which embodiments of the present invention can be implemented
  • Figure 2 illustrates an example of apparatus for use at a user equipment (UE) in Figure 1
  • Figures 3a and 3b illustrate examples of apparatus for use at an access node in Figure 1
  • UE user equipment
  • Figure 4 illustrates an example of apparatus for use at a radio network controller of Figure 1 ;
  • Figures 5 and 6 illustrate an examples of operations at UE and RNC in accordance with a first embodiment of the present invention
  • Figure 7 illustrates an example of operations at RNC in accordance with a second embodiment of the present invention
  • Figures 8 and 9 illustrate examples of the transfer of messages between UE and RNC operating according to a first embodiment of the present invention
  • Figure 10 illustrates an example of a paging message used in one example of a technique according to a second embodiment of the present invention
  • Figure 1 1 illustrates an example of the structure and timing of paging indicator, paging control and common control channels used in one example of a technique according to a second embodiment of the present invention
  • Figure 12 illustrates an example of a system information block for use in an example of a technique according to a second embodiment of the present invention
  • Figure 13 illustrates an example of the transfer of messages between UE and RNC operating according to a second embodiment of the present invention
  • Figure 14 illustrates an example of the transfer of a paging message for use in an example of a technique according to a second embodiment of the present invention.
  • Figure 15 illustrates an example of the structure and timing of paging indicator, paging control and dedicated control channels used in one example of a technique according to a second embodiment of the present invention.
  • Embodiments of the present invention are described in detail below for the example of the URA_PCH state (detailed at Section 7 of 3GPP TS25.331 V1 1.4.0), in which, for at least a period of time, the UE does not necessarily inform a UMTS Terrestial Radio Access Network (UTRAN) of cell selections.
  • UTRAN UMTS Terrestial Radio Access Network
  • the same kind of techniques are also applicable to other states in which, for at least a period of time, the UE does not inform UTRAN or another type of radio access network of cell reselections to cells within a predefined collection of cells.
  • the embodiments of this invention can be applied to a modified version of the CELL_FACH state (detailed at Section 7 of 3GPP TS25.331 V1 1 .4.0) in which the UE does not necessarily inform the UTRAN of a cell reselection.
  • Figure 1 illustrates an example of a collection of access nodes in which embodiments of the present invention can be implemented.
  • the collection of nodes include macro access nodes 2a respectively operating at least one cell having a relatively wide coverage area, and a plurality of access nodes 2b operating respective cells having a relatively small coverage area.
  • the access nodes 2 are base stations (NodeBs) of a UTRAN, typically comprising thousands of such base stations each operating one or more cells.
  • the coverage area of each cell depends on the transmission power and the directionality of the antenna by which the cell is operated.
  • the access nodes may be a combination of network entities such as a remote radio head and server or host.
  • the cells may be grouped accord- ing to geographical location, wherein each group may be known as a UMTS registration area (URA)
  • UUA UMTS registration area
  • a radio network controller RNC 8 controls the operation of the NBs 2. Only one RNC is shown in Figure 1 , but a UTRAN would typically comprise a large number of RNCs 8 each controlling a respective group of NBs.
  • Figure 2a shows a schematic view of an example of user equipment or user device (UE) 6 that may be used for communicating with the NBs of Figure 1 via a wireless interface.
  • the UE 6 may be any device capable of at least sending or receiving radio signals to or from the NBs 2 of Figure 1 .
  • UE 6 may, for example, be a device designed for tasks involving human interaction such as making and receiving phone calls between users, and streaming multimedia or providing other digital content to a user.
  • Non-limiting examples include a smart phone, and a laptop computer/notebook computer/tablet computer/ e-reader device provided with a wireless interface facility.
  • the UE 6 may communicate via radio transceiver circuitry, unit or module 206 and associ- ated antenna arrangement 205 comprising at least one antenna or antenna unit.
  • the antenna arrangement 205 may be arranged internally or externally to the UE 2.
  • the UE 6 may be provided with: a baseband unit comprising one or more baseband processors 203; and at least one memory or data storage entity 217.
  • the baseband processor 203 and one or more memory entities 217 may be provided on an appropriate circuit board and/or in chipsets.
  • the memory or data storage entity 217 is typically internal but may also be external or a combination thereof, such as in the case when additional memory capacity is obtained from a service provider.
  • the user may control the operation of the UE 6 by means of a suitable user interface such as key pad 201 , voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a display 215, a speaker and a microphone may also be provided.
  • the UE 6 may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
  • FIG 3a shows one example of apparatus for use at the NBs 2 of Figure 1.
  • the apparatus comprises or is coupled to a radio frequency antenna array 301 (comprising at least one antenna or antenna unit) configured to receive and transmit radio frequency signals; radio transceiver circuitry, module or unit 303 configured to interface the radio frequency signals received and transmitted by the antenna array 301 ; and a baseband unit comprising one or more baseband processors 306.
  • the apparatus usually comprises an interface 309 via which, for example, the baseband processor 306 can communicate with other network ele- merits such as the core network (not shown).
  • the baseband processor 306 is configured to process signals from the radio transceiver 303.
  • the radio transceiver 303 may also control the radio transceiver 303 to generate suitable RF signals to communicate information to UEs or other eNBs via a wireless communications link, and also to exchange information with other network nodes such as RNC 8 across a wired link via the interface 309.
  • the one or more memory or data storage units 307 are used for storing data, parameters and/or instructions for use by the baseband processor 306.
  • the memory or data storage entity may be internal or external (locating in another network entity) or a combination thereof.
  • Figure 3b illustrates another example of apparatus for use at the NBs of Figure 1 .
  • the appa- ratus is the same as that of Figure 3a except that the baseband unit comprising the baseband processor 306 is located remotely from the radio transceiver 303 and the antenna array 301 , and is connected to the radio transceiver 303 by e.g. a fibre optic link 31 1.
  • FIG. 4 shows an example of apparatus for use at the RNC 8.
  • the apparatus 400 includes one or more memories 407 for storing program code, and one or more data processors 406 for controlling the actions described below in accordance with program code stored at the one or more memories 407.
  • the apparatus also comprises an interface 407 via which it can send and receive information to and from other network nodes, such as NBs 2 and a core network (CN) 10.
  • NBs 2 network nodes
  • CN core network
  • the memories 217, 307, 407 may be implemented using an suitable data storage technol- ogy, such as, for example, semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the data processors 203, 306, 406 may, for example, include one or more of microprocessors, digital signal processors (DSPs) and processors based on a multi- core processor architecture. References below to processors 203, 306, 406 controlling the operation of other elements of UE and NBs refer to the baseband processors operating in accordance with program code stored at memories 217, 307, 407.
  • UE 6 continues to store one or more cell-specific device identifiers after a switch to the URA_PCH state, even if UE 6 happens to perform a cell reselection to another cell belonging to the same UTRAN Registration Area (URA) when in the URA_PCH state.
  • URA UTRAN Registration Area
  • Continuing to store one or more cell- specific identifiers after a switch to the URA_PCH state facilitates a return to the CELL_FACH or CELLJDCH state (both detailed at Section 7 of 3GPP TS25.331 V1 1 .4.0) in the event that UE happens to perform no cell reselection while UE is in the URA_PCH state, or UE happens to performs a plurality of cell reselection resulting in UE 6 returning to the original cell in which it made the switch to the URA_PCH state.
  • H-RNTI is a cell-specific identifier required for receiving one or more messages on the dedicated control channel (DCCH) of a cell
  • E-RNTI Radio Network Temporary Identifier
  • HS- DCSH is the acronym for the High-Speed Downlink Shared Channel
  • E-DCH is the acronym for the Enhanced Dedicated Channel.
  • UE is allocated a H-RNTI and E-RNTI by a data processor 406 at RNC 8 for a serving cell in which UE assumes the CELL_DCH or CELL_FACH state (STEP 602 of Figure 6).
  • the H- RNTI and E-RNTI are unique to UE 6 for that serving cell.
  • a data processor 406 at RNC 10 controls the transmission from the NB 2 operating the serving cell of a radio signal indicating the H-RNTI and E-RNTI for UE 6; and the baseband processor 203 of UE controls the transceiver 206 to receive the signal (STEP 502 of Figure 5), and stores the H-RNTI and E-RNTI in memory 307.
  • a data processor 406 at RNC 8 later decides, based on rules stored at memory 407, to switch UE 6 from the CELLJDCH (or CELL_FACH) state to the URA_PCH state (STEP 604 of Figure 6); and controls the transmission from the NB 2 operating the serving cell of a radio signal indicating an instruction for UE 6 to switch to the URA_PCH state.
  • the RNC 10 may also control the transmission from the serving NB of a signal indicat- ing an instruction for UE 6 to continue to store the cell-specific device identifiers UE 6 currently stores at memory 207, or may control the transmission from serving NB of a signal indicating new cell-specific device identifiers for UE 6 to store at memory 207 in place of the currently stored cell-specific device identifiers.
  • the baseband processor 203 switches UE 6 into the URA_PCH state (STEP 504 of Figure 5).
  • the baseband processor 203 of UE 6 determines (STEP 508 of Figure 5) if the new cell belongs to the same URA as the old cell from information indicated by reference/discovery signals broadcast by the NB 2 operating the new cell. If the result of this determination is positive, the baseband processor 203 of UE 6 controls the transceiver 206 of UE 6 to transmit a CELL UPDATE message (detailed at Section 10.2.7 of 3GPP TS25.331 V1 1.4.0) for RNC 8 (STEP 514 of Figure 5); in response, RNC allocates new H-RNTI and E-RNTI to UE 6.
  • the baseband processor 203 controls the transceiver 203 of UE 6 to receive the new H-RNTI and E-RNTI from RNC 8, and controls memory 207 to store the new H-RNTI and E-RNTI in place of the old H-RNTI and E-RNTI (STEP 516 of Figure 5).
  • the baseband processor 203 of UE 6 does not control transceiver 206 to transmit a CELL UPDATE message (STEP 510 of Figure 5), and the old H-RNTI and E-RNTI remains stored in memory 207.
  • a data processor 406 at RNC 8 refrains from allocating the H-RNTI and E-RNTI that it has allocated to UE 6 to any other UE served by the old cell for UE 6, until it detects that UE 6 has performed a cell reselection to another cell (STEPs 606 and 608 of Figure 6).
  • RNC 8 may become aware of a cell reselection by UE 6 to another cell if, for example, UE 6 transmits a URA UPDATE message (detailed at Section 10.2.60 of 3GPP TS25.331 V1 1.4.0) in the event that UE 6 moves to a cell belonging to a different URA or UE transmits a CELL UPDATE message in the event that UE 6 has data to transmit in a new cell.
  • URA UPDATE message (detailed at Section 10.2.60 of 3GPP TS25.331 V1 1.4.0) in the event that UE 6 moves to a cell belonging to a different URA or UE transmits a CELL UPDATE message in the event that UE 6 has data to transmit in a new cell.
  • a data processor 406 at RNC 8 allocates a new H-RNTI and E-RNTI to UE 6, and controls the transmission from the NB operating the new cell of a signal indicating the new H-RNTI and E-RNTI for UE 6 (STEP 610 of Figure 6).
  • Figure 8 illustrates an example of the transfer of messages between UE and RNC (via NB) in the event that UE 6 has data to transmit after switching to the URA_PCH state.
  • Figure 8a shows an example of messages for the case in which UE 6 has not performed a cell reselection in the URA_PCH state (or has performed a plurality of cell reselections in the URA_PCH resulting in a return to the old cell).
  • the baseband processor 203 of UE 6 switches UE 6 to the CELL_FACH state, and controls transceiver 206 of UE 6 to transmit a radio signal indi- eating a MEASUREMENT REPORT message (detailed at Section 10.2.19 of 3GPP TS25.331 V1 1 .4.0) or INITIAL DIRECT TRANSFER message (detailed at Section 10.2.16c of 3GPP TS25.331 V1 1.4.0) for RNC 8.
  • Figure 8a shows an example of messages for the case in which UE 6 has performed one or more cell reselections in the URA_PCH state and has data to transmit via a new cell.
  • the baseband processor 203 of UE 6 clears the old cell- specific device identifiers from memory 207, and controls transceiver 206 of UE 6 to transmit a CELL UPDATE message for RNC 8.
  • RNC replies with a CELL UPDATE CONFIRM message for UE 6.
  • Figure 9 illustrates an example of the transfer of messages between UE and RNC (via NB) in the event that there is data to be transmitted to UE 6 in the original cell (either because UE has not performed any cell reselection or because UE has performed a plurality of cell reselections and has returned to the original cell) after UE 6 has switched to the URA_PCH state but continues to store cell-specific device identifiers such as H-RNTI and E-RNTI after switching to the URA_PCH state.
  • the baseband processor 203 of UE 6 controls the transceiver 206 to regularly monitor radio resources allocated to a paging indicator channel (PICH) broadcast via all cells of the current URA.
  • PICH paging indicator channel
  • the baseband processor 203 of UE 6 switches UE 6 to the CELL_FACH state, and controls the transceiver 206 of UE 6 to transmit a MEASUREMENT REPORT message. If there is data to be transmitted to UE after UE has performed a cell reselection to another cell within the same URA, the baseband processor 203 of UE 6 re- sponds by controlling transceiver 206 to transmit a CELL UPDATE message to initiate a cell update procedure.
  • all the steps explained above can be applied to a modified CELL_FACH state in which UE 6 does not send a CELL UPDATE message every time it reselects from one cell to another but rather keeps the stored H-RNTI and E-RNTI values and initiates the cell update procedure only if it has to send/receive data when in a different cell to that in which it received the stored H-RNTI and E-RNTI values.
  • Figure 7 illustrates an example of operations at RNC 8 in accordance with a second embodiment of the present invention.
  • a data processor 406 at RNC 8 decides to switch UE 6 to the URA_PCH state in accordance with rules stored at memory 407 (STEP 702 of Figure 7).
  • data processor 406 at RNC 8 controls the transmission from NBs 2 of both (i) a paging message and (ii) a reconfiguration message (STEP 706 of Figure 7) for UE 6 in the URA_PCH state.
  • the paging message may be broadcast via all cells of the URA including the cell in which UE 6 was switched to the URA_PCH state; and the reconfiguration message may be transmitted solely via the cell in which UE 6 was switched to the URA_PCH state. If UE 6 happens to still be in the cell in which it was switched to the URA_PCH state, UE 6 receives both the paging message and the reconfiguration message, and the baseband processor 203 directly switches UE 6 to the CELL_DCH state.
  • UE 6 If UE 6 happens to have moved to a different cell when in the URA_PCH state, UE 6 receives only the paging message, and the baseband processor 203 of UE 6 controls transceiver 206 to transmit a CELL UPDATE message to initiate the cell update procedure.
  • the reconfiguration message is transmitted on a common control channel (CCCH).
  • the RNC controls the transmission from NBs of a PCCH paging message indicating the UTRAN Radio Network Temporary Identifier (U-RNTI) for which a mes- sage is to be transmitted on CCCH including control information for a downlink data transmission.
  • U-RNTI Radio Network Temporary Identifier
  • the paging message could be a modified PAGING TYPE 1 message (detailed at Section 10.2.20 of 3GPP TS25.331 V1 1 .4.0) of the kind illustrated in Figure 10, which includes an additional information element indicating that the network is going to transmit a CCCH reconfiguration message for the UE identified by the U-RNTI specified in the paging record information element.
  • Figure 1 1 illustrates an example of the timing of the CCCH reconfiguration message in relation to the PCCH paging message.
  • the CCCH reconfiguration message is transmitted in the sub-frame immediately after the sub-frame carrying the PCCH message alerting UE 6 to the transmission of a reconfiguration message for UE 6 on CCCH.
  • PCCH and CCCH messages are transmitted on the same physical channel (HS-PDSCH)
  • a different channelization code may be used for the CCCH transmis- sion, in order to better avoid interference between the CCCH transmission and any PCCH transmission that might be made in the same sub-frame.
  • the channelization code used for CCCH transmissions on HS-PDSCH may be communicated in advance to UEs by, for example, system information broadcasts.
  • Figure 12 illustrates an example of a modified SIB5 message (detailed at Section 10.2.48.8.8 of 3GPP TS25.331 V1 1.4.0) including an additional information element specifying the HS-PDSCH channelization code for CCCH.
  • the RNC 8 cannot be sure about the identity of the cell in which UE 6 is currently located.
  • the RNC 8 could configure all NBs operating one or more cells in the URA to accept UE 6 in the CELL_DCH state; but in the example described above, the RNC 8 so configures only the NB operating the cell in which UE 6 made the switch to the URA_PCH state.
  • Figure 13 illustrates an example of the transfer of messages between RNC 8 and UE 6 or NBs 2.
  • Figure 13a illustrates an example of messages for the case in which there is data to transmit to UE 6 when UE 6 is in the same cell in which it switched to the URA_PCH state.
  • the baseband processor 203 for UE 6 switches UE 6 to the CELL_DCH state, and controls transceiver 206 to transmit a Reconfiguration Complete message for RNC 8 via the NB that RNC 8 has configured to accept UE 6 in the CELL_DCH state.
  • Figure 13b illustrates an example of messages for the case in which there is data to transmit to UE 6 when UE 6 is no longer in the same cell in which it switched to the URA_PCH state.
  • the baseband processor 203 Upon detecting the transmission via the new cell of a PCCH paging message for UE 6, the baseband processor 203 controls the clearance of the old cell-specific device identifiers currently stored in memory 207, and controls the transceiver to transmit a cell update message for RNC 8 via the new cell.
  • the data processor 406 at RNC 8 configures the NB operating the new cell to accept UE 6 in the CELL_DCH state; and controls the removal of the CELL_DCH configuration from the NB operating the old cell (i.e. the cell in which UE switched to the URA_PCH state). This latter RNC operation is the same as that performed by the RNC for UEs in the CELL_PCH state, which do not have a stored dedicated H-RNTI value for the new cell.
  • the reconfiguration message for UE 6 in the URA_PCH state is transmitted on a dedicated control channel (DCCH).
  • DCCH dedicated control channel
  • This second example requires the UE 6 to continue to store the cell-specific device identifier H-RNTI in the URA_PCH state.
  • the DCCH configuration message may be transmitted via a physical shared channel, HS- SCCH.
  • a data processor 406 at RNC 8 controls the transmission from the NB 2 operating the old cell of a PCCH paging message including an indication that a DCCH reconfiguration message for UE 6 will be transmitted on the HS-SCCH channel.
  • the baseband processor 203 of UE 6 controls the transceiver to monitor the HS-SCCH channel, and acquires the reconfiguration message from the signals received by the transceiver 206 of UE 6.
  • the PCCH paging message is a modified PAGING TYPE 1 message of the kind illustrated in Figure 14.
  • This modified PAGING TYPE 1 message includes a 8-bit bitmap indicating up to eight UEs for which DCCH reconfiguration messages will be transmitted via HS-SCCH, wherein each bit of the bitmap corresponds to a respective paging record indicating a respective UE identifier.
  • FIG. 15 One example of the timing of the PICH, PCCH and DCCH transmissions is illustrated in Figure 15.
  • the transmission of the PAGING TYPE 1 message is followed by the transmission of DCCH reconfiguration messages for those UEs specified in the PAGING TYPE 1 mes- sage.
  • the number of HS-SCCH sub-frames each UE is required to monitor for receiving its DCCH reconfiguration message may be communicated to the UE in system information broadcast signalling (e.g. SIB5) or may be included in the PAGING TYPE 1 message.
  • SIB5 system information broadcast signalling
  • the DCCH reconfiguration message is transmitted without any preceding PCCH message. If the baseband processor 203 of UE 6 does not know in ad- vance whether or not a DCCH reconfiguration message is transmitted without any preceding PCCH message, the baseband processor 203 of UE 6 would look for both PCCH messages indicating the subsequent transmission of DCCH reconfiguration messages, and DCCH reconfiguration messages without preceding PCCH messages.
  • Program code may include software routines, applets and macros.
  • Program code may, for example, be copied into the one or more memories 203, 307 from any apparatus-readable non-transitory data storage medium.
  • Computer program codes may be coded by a programming language, which may be a high-level programming language, such as objective-C, C, C++, C#, Java, etc., or a low-level programming language, such as a machine language, or an assembler.
  • ASICs application specific integrated circuits

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

Abstract

L'invention concerne une technique qui consiste à : commander un récepteur radio ou un émetteur/récepteur radio d'un dispositif de communication pour recevoir via une première cellule d'une collection prédéfinie de cellules dans un réseau d'accès radio au moins un identifiant de dispositif pour ledit dispositif de communication, ledit au moins un identifiant de dispositif étant spécifique à ladite première cellule; commuter ledit dispositif de communication à un état dans lequel, pendant une certaine durée, le dispositif de communication s'abstient d'informer ledit réseau d'accès radio d'une resélection de cellule à toute cellule se trouvant dans ladite collection prédéfinie de cellules; et commander l'enregistrement en continu dudit au moins un identifiant de dispositif au niveau dudit dispositif de communication pour au moins ladite durée.
PCT/EP2013/057236 2013-04-05 2013-04-05 Resélections de cellules sans notification au réseau WO2014161604A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2013/057236 WO2014161604A1 (fr) 2013-04-05 2013-04-05 Resélections de cellules sans notification au réseau
EP13714311.1A EP2982182A1 (fr) 2013-04-05 2013-04-05 Resélections de cellules sans notification au réseau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP3249973A4 (fr) * 2015-02-06 2018-01-17 Huawei Technologies Co. Ltd. Procédé et dispositif d'optimisation de signalisation

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US20070165583A1 (en) * 2006-01-18 2007-07-19 Research In Motion Limited Methods and apparatus for use in switching communication operations between a wireless wide area network and a wireless local area network
US20090168728A1 (en) * 2008-01-02 2009-07-02 Interdigital Patent Holdings, Inc. Method and apparatus for cell reselection

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US20070165583A1 (en) * 2006-01-18 2007-07-19 Research In Motion Limited Methods and apparatus for use in switching communication operations between a wireless wide area network and a wireless local area network
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3249973A4 (fr) * 2015-02-06 2018-01-17 Huawei Technologies Co. Ltd. Procédé et dispositif d'optimisation de signalisation
US11722937B2 (en) 2015-02-06 2023-08-08 Huawei Technologies Co., Ltd. Signaling optimization method and device

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