WO2009001269A2 - Appareil, procédé et produit programme d'ordinateur fournissant une signalisation entre terminal mobile et réseau en présence de cellules privées/groupes d'abonnés fermés - Google Patents

Appareil, procédé et produit programme d'ordinateur fournissant une signalisation entre terminal mobile et réseau en présence de cellules privées/groupes d'abonnés fermés Download PDF

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Publication number
WO2009001269A2
WO2009001269A2 PCT/IB2008/052457 IB2008052457W WO2009001269A2 WO 2009001269 A2 WO2009001269 A2 WO 2009001269A2 IB 2008052457 W IB2008052457 W IB 2008052457W WO 2009001269 A2 WO2009001269 A2 WO 2009001269A2
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WO
WIPO (PCT)
Prior art keywords
cell
user equipment
indication
another cell
serving network
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Application number
PCT/IB2008/052457
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English (en)
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WO2009001269A3 (fr
WO2009001269A4 (fr
Inventor
Jarkko T. Koskela
Lars Dalsgaard
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Nokia Corporation
Nokia, Inc.
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Publication of WO2009001269A2 publication Critical patent/WO2009001269A2/fr
Publication of WO2009001269A3 publication Critical patent/WO2009001269A3/fr
Publication of WO2009001269A4 publication Critical patent/WO2009001269A4/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
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/105—PBS [Private Base Station] network

Definitions

  • the exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer program products and, more specifically, relate to signaling between a mobile terminal and a wireless network where a private cell is present.
  • the specific signaling is relevant to neighbor lists and access restrictions and configuring neighbor lists.
  • Adjacent cell measurements are carried out in cell-based telecommunications systems for example as shown in Figures 1 and 2.
  • the adjacent cell measurements are the basis for handover and cell reselection decisions.
  • the user equipment UE also termed a mobile terminal MT, measures signal quality (such as signal strength, bit error rate BER, bit error probability BEP, or other signal quality parameters in use) from its serving cell and also from adjacent cells and reports these to the network in a measurement report.
  • the measurement reports may be sent at regular intervals or in reply to a request/command from the network.
  • the UE typically determines which cells are adjacent, and more narrowly which ones to measure, based on neighbor lists which in the prior art are delivered to the UEs on one or more control channels of the wireless system.
  • the neighbor lists contain the necessary data about the adjacent cell so that the UE can find the neighbor cells easily and efficiently. Without the neighbor lists, the search for neighbor cells would consume excessive time and battery power of the UE.
  • E-UTRAN evolved universal mobile telecommunications system terrestrial radio access network, also known as 3.9G or long term evolution LTE
  • E-UTRAN is developing to include more network cells than previous systems, including private networks (a single cell or group of cells) which E-UTRAN terms a closed subscriber group CSG network cell with home eNBs (evolved node B's, or more generally base stations or access nodes).
  • GSM EDGE radio access network GERAN global system for mobile communications
  • GSM global system for mobile communications
  • UMTS terrestrial radio access network UTRAN wideband code division multiple access WCDMA, orthogonal frequency division multiplexing OFDM
  • RNC radio network controller
  • E-UTRAN requirements include support for access restrictions, to efficiently support a large amount of e.g. Home-eNBs. Access restrictions include CSGs/private networks, where only subscribers of the closed group are allowed access.
  • the term Home- eNB refers to a BS of the private network.
  • access restrictions must be capable of being handled on the cell level (e.g. Home-eNB) efficiently and without need for an excessive amount of signaling. Additionally it is also required that access restrictions are taken into account in the UE's Idle mode (as opposed to the UE's Active mode) in the sense that UEs with access restrictions will not even camp on a cell on which access is restricted.
  • the Home-eNBs If mobility is supported to the same level by the Home-eNBs as on the macro layer as above, then the cell identification and measurement ruies needs to be similar on Home-eNB cells and on the macro layer.
  • the Home-eNB's e.g. consider the Home eNB to be similar to a WLAN type device
  • the Home-eNB might not distribute any neighbor lists at all. This would mean that the Home-eNB would not distribute intra-frequency or any inter-frequency or any inter-RAT neighbor lists.
  • the network does not have to deliver an intra-frequency neighbor cell list. Identification of intra-frequency neighbour cells relies on the UE autonomously performing cell identification.
  • the network will provide a neighbor list for inter-frequency and inter-RAT cases. Details on what is delivered is not yet decided but for inter- frequency it could just be a center frequency and for inter-RAT it could be as already provided in legacy systems.
  • the UE may have to read system information from intra-frequency cells for mobility purposes.
  • the UE need not read system information from inter-frequency or inter- RAT cells.
  • the current E-UTRAN agreement is that the eNB does not need to distribute an intra-frequency neighbor cell list but the eNB may rely on the UE to autonomously search and identify intra-frequency cells. This means that the UE will perform intra-frequency cell searches according to some performance requirements -which results in continuous intra-frequency cell searches with certain time intervals. However it might make sense sometimes to disable the UE's intra-frequency cell searches.
  • Document R2-072139 also states: "It shall be possible to minimise the quantity of measurements which UEs perform on CSG Cells, if the UE does not belong to the User Group of a specific CSG Cell". This additionally indicates that there are some requirements from network operators that the UE should be able to minimize or even eliminate reporting of neighbor cells on which the UE has restricted access (meaning no access). And if it is not required for the UE to somehow identify possible private cells, then the UE would be reporting all possible DCis in the measurement reports aithough it may not have any access rights to some or all of those cells.
  • the UE will read neighbor cell system information priorto cell reselection (handover).
  • the information read from neighbor cells includes basic access restriction information like cell barring and location area LA.
  • Improved procedures for GSM/GPRS have been implemented that allow for delivering the part of this neighbor cell information from the serving cell broadcast information.
  • requiring the UE to read the BCH from all neighbors may also have a negative impact on basic mobility in the form of delayed handover in the RRC-CONNECTED state plus increased UE power consumption in both Idle and Active state.
  • [0023] is a method that includes receiving at a user equipment an indication that another cell apart from a serving network cell is a private network cell, and determining that the user equipment is restricted from accessing the another ceil, and the user equipment excluding measurements of the another cell from an uplink measurement report that it sends to the serving network cell based on the determining.
  • an apparatus that includes a receiver, a processor and a transmitter.
  • the receiver is configured to receive an indication that another cell apart from a serving network ceil is a private network cell.
  • the processor is configured to determine that the apparatusis restricted from accessing the another cell, and based on the determining the processor is configured to exclude the another cell from measurements of adjacent cells.
  • the transmitter is configured to send to the serving network cell an uplink measurement report of the adjacent cells, the uplink measurement report excluding any measurement information of the another cell.
  • such an apparatus may be a portable user equipment, or an integrated circuit/chipset that is adapted for use within a user equipment.
  • a memory storing a program of computer readable instructions that, when executed by a processor, cause actions that are directed toward determining cells for measurement reports.
  • the actions include receiving at a portable apparatus an indication that another cell apart from a serving network cell is a private network cell, and determining that the portable apparatus is restricted from accessing the another cell, and then based on the determining, excluding measurements of the another cell from an uplink measurement report that the portable apparatus sends to the serving network cell.
  • an apparatus that includes receiver means such as for example a wireless receiver, processing means such as for example a digital signal processor, and sending means such as for example a wireless transmitter.
  • the receive means and the sending means may be embodied for example in a single transceiver.
  • the receive means is for receiving an indication that another cell apart from a serving network cell is a private network cell.
  • the processing means is for determining that the apparatusis restricted from accessing the another cell, and based on the determining the processing means is further for excluding the another cell from measurements of adjacent cells.
  • the sending means is for sending to the serving network cell an uplink measurement report of the adjacent cells, the uplink measurement report excluding any measurement information of the another cell.
  • such an apparatus may be a user equipment, or an integrated circuit/chipset that is adapted for use within a user equipment.
  • a method that includes determining that a user equipment is restricted access from another network cell that is a private network cell, signaling from a serving network cell an indication that another cell is a private network cell, and receiving from the user equipment an uplink measurement report of adjacent cells, wherein the uplink measurement report excludes measurements of the another cell.
  • an apparatus that includes a processor, a transmitter and a receiver.
  • the processor is configured to determine that a user equipment is restricted access from another network cell that is a private network cell.
  • the transmitter is configured to signal an indication that another cell is a private network cell.
  • the receiver is configured to receive from the user equipment an uplink measurement report of adjacent cells, wherein the uplink measurement report excludes measurements of the another cell.
  • such an apparatus may be a network node such as a base station/eNodeB, or an integrated circuit/chipset that is adapted for use within such a network node.
  • Figure 1 is a schematic representation of a cellular telecommunications system showing a cluster of adjacent cells with mobile terminals MT in each, where any of the cells ffidy restrict ciccess to some of the de ⁇ icted MTs.
  • Figure 2 is a schematic representation similar to Figure 1 where a MT maintains in a !oca! memory a neighbor list of information for other adjacent/neighbor cells.
  • Figure 3 is a high level block diagram of various devices used in carrying out various aspects of the invention.
  • Figure 4 is a signaling diagram between a serving network cell and one user equipment/mobile terminal showing alternative ways for access restriction information to be given to the UE according to embodiments of the invention.
  • Figure 5 is a signaling diagram similar to Figure 4 showing how access restriction information can be signaled to the target network cell according to an embodiment of the invention.
  • Figure 1 shows a cluster of cells each with a BS/eNB/access point and a plurality of MTs/UEs. Any particular one of the MTs/UEs may be in or moving toward or moving adjacent to a private network/Home-eNB for which it does not have access rights and will not be granted access.
  • Figure 2 is a neighbor list that the MT/UE maintains in order to avoid excessive measuring and searching for inter-frequency and inter-RAT cells.
  • a private network/CSG may span one or more cells.
  • Embodiments of the invention address some of the above-mentioned challenges in several aspects summarized here.
  • the serving cell/eNB sends to the UE access restriction information prior to the UE being handed over to a target cell/eNB.
  • FHO forward handovers
  • BHO backward handovers BHO
  • the UE sends to the target cell/eNB the access restriction information after the handover.
  • the serving cell/eNB identifies by location area LA or tracking area TA (or similar area-specific iists) in a neighbor DCi iist that it sends to a UE any private networks/eNBs that are in that neighbor list.
  • the eNB may also or alternatively indicate in the neighbor cell list if the whole frequency layer is usage-restricted.
  • the UE receives that/those indicators, and knows from them whether it is required to measure that layer or the individually indicated cells. For the case where a particular UE is registered and has access rights, the UE 10 may still be required to measure and report, but potentially not for cells that restrict that UE.
  • the UE in order to facilitate handovers without signaling neighbor lists in each cell, the UE retains in a local memory a neighbor list derived in a previous cell when entering a Home-eNB/CSG cell for which it does have access rights.
  • the CSG cell can broadcast an indicator in its system information SI that the UE 10 is to use a neighbor cell list from a previous cell.
  • SI system information
  • the immediately previous cell is also restricted or also indicated by its SI that the UE is to carry over its previous neighbor cell list
  • that same neighbor cell list is again carried through the second previous cell, and so on until the UE encounters a new cell for which it has access and can get a new neighbor list.
  • the UE carries its neighbor cell list from the latest camped cell.
  • the UE receives SI in the new cell, which may distribute its own neighbor cell list. If the new cell does not distribute its own neighbor cell list it may indicate to the UE through its SI that the UE shall use its previous neighbor cell list. There may also be an additional indicator to tell the UE whether or not to perform intra-frequency cell searches while the UE 10 is in the cell which is sending the indicator.
  • a wireless network 9 is adapted for communication with a UE 10 via a node B 12 (e.g., base station or eNB).
  • the network 9 may include a higher controlling node genericaliy shown as a gateway GW 14, which may be referred to variously as a radio network controller RNC, a user plane entity UPE, a mobility management entity MME, or a system architecture evolution gateway SAE- GW.
  • the GW 14 represents a network node higher in the network than the eNB 12.
  • the UE 10 includes a data processor (DP) 10A, a memory (MEM) 10B that stores a program (PROG) 10C, and a suitable radio frequency (RF) transceiver 10D for bidirectional wireless communications with the eNB 12, which also includes a DP 12A, a MEM 12B that stores a PROG 12C, and a suitable RF transceiver 12D.
  • the eNB 12 may be coupled via a data path 16 (e.g., lub or S1 ) to the serving or other GW 14.
  • the eNB 12 and the UE 10 communicate over a wireless link 15, each using one or more antennas 12E, 10E.
  • At least one of the PROGs 10C and 12C is assumed to include program instructions that, when executed by the associated DP, enable the electronic device to operate in accordance with the exemplary embodiments of this invention, as will be discussed below in greater detail.
  • the exemplary embodiments of this invention may be implemented by computer software executable by the DP 10A of the UE 10 and the other DPs, or by hardware, or by a combination of software and/or firmware and hardware.
  • the interactions between the major logical elements should be obvious to those skilled in the art for the level of detail needed to gain an understanding of the concept of the invention.
  • the invention may be implemented with an appropriate signal processor such as shown in Figure 3, a digital signal processor or other suitable processor to carry out the intended function of the invention, including a central processor, a random access memory RAM, read only memory ROM, and input/output ports for coupling to other components in the network element/e-NB or UE in which this processor is disposed.
  • the various embodiments of the MT/UE 10 can include, but are not limited to, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • the MEMs 10B and 12B may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the DPs 10A and 12A may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
  • At least one of the memories is assumed to include program instructions that, when executed by the associated processor/CPU, enable the electronic device to operate in accordance with the exemplary embodiments of this invention, as summarized above and detailed further below.
  • the exemplary embodiments of this invention may be implemented at least in part by computer software executable by the controller/CPU of the network element 12 or UE 10, or by hardware, or by a combination of software and hardware.
  • the UE 10 will read neighbor cell system information prior to cell reselection/handover.
  • the information read from neighbor cells includes basic access restriction information like cell barring and LA.
  • Improved procedures for GSM/GPRS have been implemented and allow for delivering the part of this neighbor cell information from the serving cell's broadcast information.
  • the network/eNB 12 updates or otherwise instructs the UE 10 about possible access restrictions in dedicated DL signaling.
  • This dedicated signaling can be sent in response to a UE measurement report, for example.
  • the network/eNB 12 may reply either in a separate message or include in a HO command message, information concerning neighboring cell(s) access restriction.
  • Access restriction information in this sense could e.g. be location area LA of neighboring cell(s), barring information, 'private' ceil indication or simply some indication that a certain cell is access restricted.
  • the network/eNB 12 can indicate any identity (e.g. tracking area TA identity) of private networks/cells in the neighbor cell list it distributes to the UE 10.
  • the information could be in the part of the neighbor list where properties of the private network/cell frequency are indicated.
  • this aspect of the invention can be implemented in E- UTRAN/LTE if the private network/cell is deployed on another (center) frequency (or separate frequency layer) than the public non-restricted network.
  • the serving cell inter- frequency neighbor cell list would simply list the (center) frequency of the private network/cell and the identity (LA/TA) associated with the private network/ceii. This information can then be utilized by the UE 10 in both idle and active modes to avoid measurement/identification of inter-frequency cells in cases when UE 10 would not have access rights for those cells.
  • a current assumption in E-UTRAN is that all private networks have been allocated a tracking area id (TAJD), which would by the above example be indicated in the neighbor cell list.
  • TJD tracking area id
  • the UE 10 would know whether it has access to the private network indicated in the neighbor cell list- either because it has been registered to such a private network earlier or the UE 10 has received and stored some whitelist (allowed list) of identities of private networks to compare against - the UE 10 will use the identity in the neighbor cell list to know when or if it should start to measure/identify a restricted cell on that frequency.
  • Any unique identifier for the cell may be used, such as TA, LA, Cell-ID and the like, or even a newly defined identifier for the cell.
  • the private network indicated above can also be indicated by the regular Home-eNB; the network would organize Home-eNBs so that a cell in a geographically same area would have the same TA and indicate TA_ID(s) of nearby Home-eNBs in the neighbor cell list (or any information on the broadcast channels).
  • the UE 10 could use this information similarly to private network cases to avoid measuring/looking for Home-eNBs all the time when it hears a frequency related to the Home-eNBs.
  • the UE 10 would not be reporting (sending a measurement report) for those cells for which UE does not have access rights.
  • the UE 10 receives the dedicated access restriction information in the dedicated downlink signaling, determines whether it is restricted from the ce!l(s) that is/are indicated as restricted, and only if the determination is that the UE 10 has access does the UE perform measurements of that/those celi(s) and sends measurement reports of that measurement data.
  • the UE 10 can also or alternatively inform the eNB 12 of its access restrictions.
  • the UE 10 includes possible access restrictions to be applied by the UE. This may be sent for example in the handover (HO) signaling, such as in the HANDOVER_CONFIRM message that the UE sends to the new serving cell/eNB 12 after a cell change.
  • HO handover
  • Figure 4 illustrates these aspects of the invention in an exemplary signaling protocol.
  • the UE 10 and serving eNB 12 are depicted, and the UE 10 is in the RRC_CONNECTED state 402 in which mobility/handovers are performed using UE assisted (measurement reporting) and network controlled (FHO) handover procedures.
  • the eNB 12 broadcasts system information 404, which includes general measurement rules to be applied by all UEs camped on the eNB's cell.
  • the eNB 12 instructs the UE 10 that it is to send a measurement report to the network, the UE 10 generates at 408 the measurement report according to the rules at 404 and the UE 10 sends at 410 the measurement report in the uplink to the eNB 12.
  • the measurement report includes a mix of intra- frequency, inter-frequency and possibly inter-RAT neighbor cells.
  • the network evaluates 412 possible access restriction settings for the included cells (and possibly also other non-reported cells for which it received information from other UEs). After evaluating the information 412 the network/eNB 12 may send new/updated access restriction information to the UE 10.
  • a UE 10 receiving such information stores and applies this information according to the given rules for applying access restrictions in the network.
  • that update to access restriction information is given in a separate message apart from a HO related message, such as in a measurement command message 414.
  • the network/eNB 12 can alternatively provide those access restrictions already in the HO procedures before the UE 10 reports any cells to the network/eNB 12.
  • Shown at option B by example is for the network/eNB 12 to include those access restriction updates in the handover command 416, where the updated access restriction requirements are for the target cell to which the handover command relates (includes the target cell information),
  • the network/eNB 12 When the network/eNB 12 informs those access restrictions forthe UE 10, it can deny or restrict access to a whole frequency layer/RAT if the network determines or knows that there are no cells where the UE has access rights on those frequencies. A single bit in the neighbor cell list can be used to inform the UE 10 that the whole RAT/frequency layer is access restricted.
  • the network/eNB 12 can inform each access-restricted cell separately if the restriction is not RAT-wide, or it may just inform/signal the UE 10 to report only those cells where the UE 10 is subscribed i.e. has access rights. Also, this information is available forthe UE 10 in both the idle and the active mode, so it can be utilized by the UE in both states.
  • the UE 10 determines whether it is required to measure that layer at all or if it needs to use any special handling when measuring/evaluating/ranking cells on that layers. The UE 10 is not required to measure and report if the UE 10 is not registered to any of the CSG cells in that frequency layer/RAT. Now, for a restricted access single-cell network, the eNB 12 can inform the UE 10 in a message that single-cell network is access restricted and, so long as the UE 10 knows/determines that it is not a subscriber to that restricted cell, the UE 10 knows that it does not need to perform intra-frequency cell searches.
  • the aspect of the invention where the UE 10 informs the network of its possible access restrictions may be implemented as follows and as shown by example at Figure 5.
  • the context is the UE 10 being in the RRC_CONNECTED state 402, and other like reference numbers indicate like signaling/actions as detailed with respect to Figure 4.
  • option C after the UE 10 has received the handover command 518 from the network/eNB 12 and changed 520 to the target cell/eNB 12 as indicated in the Handover command message, the UE 10 will send a handover_confirm message 522 back to the network (but this time to the target eNB 12 since changeover 520 has occurred) in order to confirm its presence and the success of the cell change.
  • the handover_confirm message 522 is in this embodiment enlarged (as compared to the similar prior art message) to include possible access restrictions to be applied by the UE 10.
  • the target eNB 12 is thereby informed as to which private networks/RATs the UE 10 recently handed over is restricted or authorized access.
  • the above implementations rely on neighbor lists, which as noted in the background section become difficult in E-UTRAN and other systems having private networks as compared to an all-public network. Merely extending the way that legacy all-public systems handled neighbor lists would also add greatly to signaling overhead, often with little benefit as to the private network aspects.
  • the UE 10 is required to remember (to keep stored locally in its MEM 10C) the macro layer cell information when entering the Home-eNB. In a first embodiment this is the last received neighbor list or a combination of neighbor cells and identified cells. In a second embodiment it is the list of last identified and/synchronized cells prior to entering the Home-eNB/CSG cell.
  • channel information e.g. frequency band or carrier
  • channel information e.g. frequency band or carrier
  • This aspect is seen to be particularly advantageous for limited size CSG/Home-eNB networks (e.g., 1 or 2 Home-eNB cells).
  • a bit more extensive and tailored list may need to be constructed for retaining in local storage for the case of larger private networks, but the concept can be readily combined with other proposed self/auto-configuration and self- optimization algorithms and schemes.
  • the Home-eNB 12 has the option of not transmitting any inter-frequency or inter-RAT neighbor ceil iists to the UE 10, and also an option of notifying the UE 10 to stop intra-frequency measurement if the CSG/Home-eNB contains only one DCi.
  • this might seem a bit counterintuitive, but they are meant for different purposes and most advantageously used at different times and under different circumstances.
  • the UE 10 importing the neighbor cell list it would know what to measure. When to measure will depend on triggers and possible timers, as seen in Figures 4-5.
  • Using a bit indicating to the UE 10 that it is not to measure intra-frequency cells is most beneficially used in a single restricted cell environment, which allows the UE 10 to skip the intra-frequency cell searches in a simple way. This may improve UE power consumption and ensure that the UE 10 doesn't unnecessarily identify cells which are not accessible to it. This also aids in reducing event triggers and possible unnecessary measurement reporting.
  • the eNB 12 will distribute a neighbor cell list else the UE 10 will have no neighbor list at all.
  • the UE 10 would preferably need a neighbor cell list for ensuring mobility to a satisfactory level. But if mobility isn't really wanted unless service from current eNB is lost (WLAN style) then the option forthe UE 10 not having any neighbor list is possible (e.g., a one-bit indication that the UE 10 is not to use the imported neighbor list and no neighbor list distributed by the eNB 12). This would be advantageous for the UEs in the idle mode.
  • the different aspects of the invention detailed above may be summarized as the following steps.
  • the network instructs the UE to perform measurement ii)
  • the UE reports the measurement including a mix of intra-frequency, inter-frequency and possibly inter-RAT neighbor cells.
  • the network updates and sends to UE the access restriction information in the neighboring cell list.
  • This list can be conveyed in a HO message or in a new separate message.
  • the access restriction information does not have to be in the neighbor list; that is simply a convenient place to put the information. Other information elements, even newly defined ones, may be used.
  • the network can also provide the access restriction information before the UE 10 reports any cells to the network (by skipping the first two steps).
  • the Home-eNBs of a private network may transmit neighbor celi lists. Inclusion of access restriction information into the neighbor ceil list is advantageously used in the macro layer (non-restricted network) for aiding the UE 10 cell search and possibility to skip cell searches.
  • the option for home-eNBs not transmitting the neighbor cell list at all in order to simplify the configuration of home-eNB as well the UE's behavior necessarily relates to Home-eNB usage rather than the macro layer.
  • the UE is allowed to inform its possible access restriction information to the eNB, which eases the burden of the X2 (eNB to eNB) interface during a handover.
  • the network uses the UE measurement report not primarily to indicate access restrictions in the broadcast information, but to limit the measurement reporting and measuring of cells to which the UE 10 does not have access. If the UE 10 just reports cells the network may then, based on the cell identification in the measurement report, inform the UE 10 about possible access restrictions. So the report is most advantageously used for informing network about which cells the UE is monitoring, and the network then can stop the UE 10 from submitting measurement reports for cells to which it might be measuring butfrom which it is restricted having access.
  • the UE can do the measurement before the network sends it the access information (e.g., the frequency of the neighboring cells).
  • the UE 10 will know which frequencies to search neighbor cells based on broadcast information received in the current serving cell.
  • the UE 10 can perform cell search and identification and signal level measurements without reading the neighboring cell's common broadcast information, where the information concerning possible access restriction is currently understood to be broadcast.
  • the invention involves cooperation between elements of a communication system. Examples of a wireless communication system include implementations of GSM (Global System for Mobile Communication) and implementations of UMTS (Universal Mobile Telecommunication System).
  • Each such wireless communication system includes a radio access network (RAN).
  • RAN radio access network
  • the RAN is called UTRAN (UMTS Terrestrial RAN).
  • a UTRAN (or Evolved UTRAN) includes one or more Radio Network Controllers (RNCs, or generically a controller of a radio network), each having control of one or more Node Bs (e-Node Bs), which are wireless terminals configured to communicatively couple to one or more UE terminals.
  • RNCs Radio Network Controllers
  • a GSM RAN includes one or more base station controllers (BSCs), each controlling one or more base transceiver stations (BTSs).
  • BSCs base station controllers
  • BTSs base transceiver stations
  • BSS base station system
  • the exemplary embodiments of this invention further provide a method, apparatus and computer program product(s) for a UE to execute the signaling as shown in Figures 4-5 and respond as described with reference to those figures, though not necessarily limited to the exemplary messages noted there. Further, the UE will store locally a neighbor list from a previous cell while in a new cell and use that previously stored neighbor list for determining measurement reports and neighboring cell information.
  • the various exemplary embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • various aspects of the exemplary embodiments of this invention may be illustrated and described as block and signaling diagrams, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

Abstract

L'invention concerne un équipement utilisateur UE qui reçoit une indication du fait qu'une autre cellule différente d'une cellule de réseau de desserte est une cellule de réseau privé, détermine qu'il lui est interdit d'accéder à l'autre cellule, et exclut des mesures de l'autre cellule dans des rapports de mesure de liaison montante qu'il envoie à la cellule de réseau de desserte. L'indication peut être reçue dans une signalisation de liaison descendante dédiée (instruction de transfert après un rapport de mesure déclenché) ou diffusée par la cellule de desserte ou la cellule privée, et l'équipement utilisateur constate que la cellule privée n'est pas sur sa liste blanche de cellule privée. Selon l'entité ayant envoyé l'indication, l'équipement utilisateur peut signaler au nœud B évolué (eNB) de desserte ou à un eNB suivant qu'il lui est interdit d'accéder à cette cellule privée. L'indication peut être qu'une couche de fréquence entière est à accès limité. L'équipement utilisateur transporte sa liste de voisins à partir de la cellule la plus récente sur laquelle il se trouvait lorsqu'il transite par la cellule privée interdite.
PCT/IB2008/052457 2007-06-22 2008-06-20 Appareil, procédé et produit programme d'ordinateur fournissant une signalisation entre terminal mobile et réseau en présence de cellules privées/groupes d'abonnés fermés WO2009001269A2 (fr)

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TWI501663B (zh) * 2009-06-19 2015-09-21 Interdigital Patent Holdings 家用節點ｂ偵測及測量方法及裝置
CN105050134A (zh) * 2009-06-19 2015-11-11 交互数字专利控股公司 在wtru中实施的用于检测hnb的方法
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WO2011013178A1 (fr) * 2009-07-31 2011-02-03 Panasonic Corporation Procédé et appareil permettant une commande de préparation de transfert intercellulaire intrant dans un système de communication mobile
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US9781636B2 (en) 2009-10-30 2017-10-03 Interdigital Patent Holdings, Inc. Method and apparatus for efficient signaling and usage of resources for wireless communications supporting circuit switched and packet switched sessions
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WO2011057300A3 (fr) * 2009-11-09 2011-08-18 Qualcomm Incorporated Amélioration de resélection de cellule
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CN114145046A (zh) * 2019-07-18 2022-03-04 三星电子株式会社 用于在无线通信系统中确定小区的方法和装置
WO2022063132A1 (fr) * 2020-09-23 2022-03-31 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Appareil et procédé de communication associé

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