WO2011013178A1 - Procédé et appareil permettant une commande de préparation de transfert intercellulaire intrant dans un système de communication mobile - Google Patents

Procédé et appareil permettant une commande de préparation de transfert intercellulaire intrant dans un système de communication mobile Download PDF

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WO2011013178A1
WO2011013178A1 PCT/JP2009/003659 JP2009003659W WO2011013178A1 WO 2011013178 A1 WO2011013178 A1 WO 2011013178A1 JP 2009003659 W JP2009003659 W JP 2009003659W WO 2011013178 A1 WO2011013178 A1 WO 2011013178A1
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information
mobile terminal
csg
cell
enb
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PCT/JP2009/003659
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English (en)
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Hong Tat Toh
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Panasonic Corporation
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Priority to PCT/JP2009/003659 priority Critical patent/WO2011013178A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • 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]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • This invention pertains to mobile communications network. More specifically, it relates to upload a list of cells identities information within mobile's vicinity to network. Such information should assist mobility management procedure in a mobile communication system.
  • a Mobile Terminal is required to support handover from one cell to another cell. This includes handover between macro cells, between CSG (Closed Subscriber Group) cells, and between a macro cell and a CSG cell.
  • the Base Stations e.g. eNodeB (eNB) & Home eNodeB (HeNB)
  • eNB eNodeB
  • HeNB Home eNodeB
  • S1-based handover via core network i.e. Mobility Management Entity (MME)
  • MME Mobility Management Entity
  • MME Mobility Management Entity
  • PCI physical cell identity
  • eNB may not be able to identify the CSG cells uniquely among neighbouring cells as reported by Mobile Terminal.
  • second reporting configuration to include more detail information like Cell Global Identity (CGI) of that intended cell is required, as defined in [3GPP TS 36.300]) to resolve the above problems.
  • CGI Cell Global Identity
  • a possible approach to remove the need of having Mobile Terminal to make second reporting configuration is, e.g. make the Mobile Terminal always report CGI information in the first reporting configuration message. But, this would further delay reporting, e.g. Mobile Terminal is required to always access target cell System Information Block 1 (SIB1) information in order to retrieve CGI of the target cell. This would increase waiting time for the Mobile Terminal to transmit reporting to network.
  • SIB1 Target Cell System Information Block 1
  • the present invention relates to the upload a list of non-accessible CSG cells to eNB such that for eNB to make handover decision to HeNB without further delay.
  • This invention introduces a list of CSG cells information which is a list of Non-Allowed-CSG-List (NACL), as generate and upload to the eNB by Mobile Terminal before reporting.
  • the NACL consists of the list of individual cell information (e.g. Physical Cell Identity (PCI), Cell Global Identity (CGI), CSG identity) such that the detected cells are within Mobile Terminal's vicinity.
  • PCI Physical Cell Identity
  • CGI Cell Global Identity
  • CSG identity e.g. Physical Cell Identity
  • the Mobile Terminal should perform autonomous search and suitability check procedures of that detected CSG cell.
  • the Mobile Terminal When NACL is generated, the Mobile Terminal would provide this NACL to the eNB via uplink dedicated signaling. The eNB could adopt this NACL to perform handover decision based on the reported PCI transmitted from the Mobile Terminal.
  • the reported PCI configured in the reporting configuration message by Mobile Terminal is sufficient for eNB to exclude reported CSG cell that fall within the NACL as handover candidate cell.
  • extra operation in acquiring addition relevant information from non-allowed CSG cell which could be the suitable handover candidate cell, by the Mobile Terminal and interaction between eNB and MME for access control verification is removed by the present invention. Therefore, eNB can make correct handover decision to accessible CSG cell without further delay.
  • Another object of the present invention is to enable Mobile Terminal to generate and upload a list of Allowed-CSG-List (ACL) to eNB before reporting.
  • the Mobile Terminal should generate the ACL based on autonomous search and suitability check procedures.
  • the ACL would be uploaded and adopted by eNB to make correct handover decision to CSG cell without acquiring addition relevant information from target CSG cell.
  • inbound handover mobility to CSG cell would not result in Mobile Terminal service interruption and latency in mobility experience.
  • Another object of the present invention is to enable eNB to control the frequency of uploading the cell information from Mobile Terminal as it is not necessary for Mobile Terminal to upload the same piece of cell information to eNB. This would reduce the amount of signaling loads being transmit from Mobile Terminal to eNB.
  • Another object of the present invention is to monitor the validity of the uploaded cell information as adopted in eNB since the accessibility status of the CSG cells may change. This is to ensure the validity of the uploaded cell information as stored in eNB is guarantee.
  • Another object of the present invention is to support the uploading scheme for Mobile Terminal in high mobility environment since the surrounding detected CSG cells could change quite often.
  • Figure 1 illustrates the system architecture that adopts the uploading scheme to generate Non-Allowed-CSG-List parameter according to the present invention.
  • Figure 2 illustrates an operation sequence of the present invention in generating Non-Allowed-CSG-List parameter for Source eNodeB (s_eNB) in the architecture as shown in Figure 1.
  • Figure 3A illustrates an example architecture of a s_eNB that implements the present invention.
  • Figure 3B illustrates an operation logic for the s_eNB to use the Non-Allowed-CSG-List parameter.
  • Figure 4A illustrates an example architecture of a Mobile Terminal that implements the present invention.
  • Figure 4B illustrates an operation logic of the Mobile Terminal to generate the Non-Allowed-CSG-List parameter.
  • Figure 5 illustrates an operation sequence of the present invention in generating Allowed-CSG-List parameter for Source eNodeB (s_eNB) in the architecture as shown in Figure 1.
  • Figure 6 illustrates an operation logic for the s_eNB to use the Allowed-CSG-List parameter.
  • Figure 7 illustrates an operation logic of the Mobile Terminal to generate the Allowed-CSG-List parameter.
  • Figure 8 illustrate an operation logic for the Mobile Terminal to upload of cell information parameter upon request.
  • Figure 9 illustrate an operation logic for the Mobile Terminal to update the uploaded cell information parameter.
  • Figure 10 illustrate an operation logic for the Mobile Terminal in high mobility environment to support the cell information parameter uploading scheme.
  • the Mobile Communication System (100) includes a number of CSG cells (140, 142, 144, 146, 148, 150) that are provided via Base Stations (108, 110, 112, 114, 116, 118).
  • Base Stations can use the interfaces (126, 128, 130, 132, 134, 136) to connect to other nodes of the operator's core network e.g. Mobility Management Entity (MME), (102) via a Home eNodeB Gateway (HeNB-GW) (104) using interface (122).
  • MME Mobility Management Entity
  • HeNB-GW Home eNodeB Gateway
  • the Base Station is also referred to as Home eNodeB (HeNB) (108, 110, 112, 114, 116, 118). This CSG cells deployment is within a Base Station coverage known as eNodeB (eNB) (106).
  • the eNB (106) is also connected to MME (102) via interface (124).
  • the Mobile Terminal (120) is connected to the Source eNB (s_eNB) (106) in macro cell (138).
  • the HeNBs (108, 110, 112, 114, 116, 118) can directly connect to the MME (102) without going through the HeNB-GW (104).
  • interfaces 126, 128, 130, 132, 134, 136 would terminate on MME (102). This would not affect the general principle of the present invention.
  • the Mobile Terminal (120) is originally communicating with the s_eNB (106).
  • the s_eNB (106) provides operator's services to the Mobile Terminal (120) using interface (124).
  • the s_eNB (106) connects to an operator core network control entity, MME (102).
  • MME (102) is in charge of managing the access control of the Mobile Terminal (120), i.e. MME (102) decides if a Mobile Terminal (120) is allowed to connect to any of the CSG cell base stations.
  • the Mobile Terminal (120) when connected to the s_eNB (106), the Mobile Terminal (120) may decide to trigger, e.g. when the stored allowed Closed Subscriber Group (CSG) list in Mobile Terminal (120) is non-empty, an autonomous search procedure (202) in order to detect the neighbouring CSG cells within Mobile Terminal's (120) vicinity, similar to that specified in [3].
  • CSG Closed Subscriber Group
  • the Mobile Terminal (120) Upon the trigger of autonomous search procedure (202), the Mobile Terminal (120) should be able to detect neighbouring HeNBs (114, 116, 118) and start to perform the suitability check procedure by reading the System Information Block from the detected CSG cells via system information (204, 206, 208). In the suitability check procedure, the Mobile Terminal (120) should decide whether the cell information of that detected CSG cell need to be generated within the NACL information in (210).
  • the Mobile Terminal (120) should generate the intended cell identifier information, e.g. Physical Cell identity (PCI), Cell Global Identity (CGI), CSG identity (CSGID)) from the reception of the system information and stored within the NACL information. For example, with the reception of system information, the Mobile Terminal (120) should access the System Information Block 1 as defined in [2] to retrieve the cell identifier information, e.g. Cell identity, Public Land Mobile Network identity and CSG identity of that detected CSG cell. Based on the reception of cell identifier information, the Mobile Terminal (120) should perform a suitability check against with the stored allowed CSG list.
  • PCI Physical Cell identity
  • CGI Cell Global Identity
  • CSG identity CSG identity
  • the Mobile Terminal (120) should generate the NACL information by including the cell identifier information of the detected CSG cell.
  • a typical NACL entry may include the following information:
  • the Mobile Terminal (120) should configure the NACL information and transmit to s_eNB (106) via uplink dedicated signaling (212), e.g. RRC Connection Setup Complete, RRC Connection Reconfiguration Complete, Measurement Report as defined in [2].
  • the s_eNB (106) Upon receiving the Cells Identifier Report (212), the s_eNB (106) should stored the configured NACL information and use this configured information to support handover mobility procedure. In order to allow s_eNB (106) monitor the radio condition of the Mobile Terminal (120), the s_eNB (106) should configure the measurement configuration to Mobile Terminal (120) via downlink dedicated signaling (214), e.g. RRC Connection Reconfiguration as defined in [2]. Based on the reception of measurement configuration, the Mobile Terminal (120) could start to monitor the radio condition of the neighbouring cells.
  • downlink dedicated signaling e.g. RRC Connection Reconfiguration as defined in [2].
  • the Mobile Terminal (120) Upon the reporting criteria has met, the Mobile Terminal (120) should report the cells it has measured. The Mobile Terminal (120) should configure the reported cells information and transmit to s_eNB (106) via uplink dedicated signaling (216), e.g. Measurement Report as defined in [2].
  • the s_eNB (106) should adopt the NACL information to assist handover decision procedure.
  • the s_eNB (106) should perform the checking procedure (218) as to determine if there is cell identifier present in both the stored NACL information and the reported cell information. Upon same cell identifier is determined within these two configured information, the s_eNB (106) should exclude this cell identifier as a candidate cell for handover procedure. For example, based on radio condition, a CSG cell is consider as a suitable cell for handover, Mobile Terminal (120) should verify if that CSG cell is accessible or not by acquiring addition relevant information from that CSG cell.
  • s_eNB (106) would consider that CSG cell is not accessible to the Mobile Terminal (120) and should exclude that CSG cell as handover candidate cell (i.e. no acquiring of addition relevant information from that CSG cell is required).
  • the s_eNB (106) could obviate the extra operation before decide on the intended cell as target cell to perform handover execution procedure.
  • the s_eNB (106) should configure the handover configuration information and transmit to Mobile Terminal (120) via downlink dedicated signaling (220), e.g. RRC Connection Reconfiguration message as defined in [2].
  • handover decision could be decided by s_eNB (106) faster and this would greatly reduce Mobile Terminal (120) from encountering handover failure due to delay in receiving Handover Command message before Mobile Terminal (120) encounter bad radio condition.
  • the s_eNB (106) comprises two major components, namely the CSG List Management Unit (302) and the Mobility Management Unit (306).
  • Mobility Management Unit (306) is in charge of handling all the mobility management related signaling between the Mobile Terminal (120) and s_eNB (106).
  • the protocol used between them is as specified in [2].
  • the CSG List Management Unit (302) is in charge of managing the NACL information of the detected CSG cells as provided from Mobile Terminal (120) via Cell Identifier Report (212) and adopts the NACL information to assist in handover mobility procedure. For example, when a measurement report is transmitted from the Mobile Terminal (120) as shown in Figure 2, the Mobility Management Unit (306) will consult the CSG List Management Unit (302) via interface (304) of whether the Mobile Terminal (120) should treat this CSG cell as non-accessible by checking the reported PCI of the CSG cell against with the stored NACL information. Based on this checking procedure, the CSG List Management Unit (302) could identify non-accessible CSG cell and narrow down the number of CSG cells as target cell by excluding the detected CSG cell to be a handover candidate cell.
  • the CSG List Management Unit (302) will pass the outcome of the checking result to Mobility Management Unit (306) via interface (304).
  • the Mobility Management Unit (310) would then decide on the intended cell as target cell for Mobile Terminal (120) to be handover to.
  • the handover configuration information is configured to Mobile Terminal (120) via downlink dedicated signaling, as shown in Figure 2.
  • the CSG List Management Unit (302) will be notified of the NACL information by the Mobility Management Unit (306), as in step 308.
  • the CSG List Management Unit (302) will store the NACL information, as in step 310. If the CSG List Management Unit (302) already has a stored copy of NACL information, the latest received NACL information should be used instead. In another words, the CSG List Management Unit (302) will replace the stored copy with the newly received copy of NACL information, as in step 310.
  • the NACL information should be used to assist s_eNB (106) to perform handover decision procedure, as in step 312.
  • the CSG List Management Unit (302) will perform a suitability check procedure based on the stored NACL information and the received reported cell identifier information.
  • s_eNB (106) should decide which reported PCI should adopt to perform the suitability check procedure. For example, based on radio condition, s_eNB (106) should choose the strongest cell in term of signal strength, to perform this suitability check procedure. The purpose of this checking procedure is to verify if that reported PCI of the CSG cell is non-accessible to the Mobile Terminal (120). Upon same PCI is detected in both the reported PCI and NACL information, the s_eNB (106) should exclude that reported PCI as candidate for handover (i.e.
  • s_eNB (106) should choose another reported PCI from the reported cell identifier information to perform the suitability check procedure again. For example, the second strongest cell in term of signal strength could be chosen by s_eNB (106) to perform the suitability check procedure.
  • the s_eNB (106) should consider that reported PCI as candidate for handover, as in step 316.
  • step 316 the CSG List Management Unit (302) should consider the reported PCI as handover candidate cell and pass this information to Mobility Management Unit (306) via interface (304), as in step 318.
  • the Mobility Management Unit (306) should generate the handover configuration information and transmit this configuration information to Mobile Terminal (120), as in step 320 via a downlink dedicated signaling, e.g. RRC Connection Reconfiguration as defined in [2].
  • a downlink dedicated signaling e.g. RRC Connection Reconfiguration as defined in [2].
  • the CSG List Management Unit (302) can take into account other information in performing the suitability check procedure against with NACL information, e.g. Mobile Terminal's (120) location, previous camped on cell information, relationship between HeNBs and HeNBs/eNBs, load condition of the system, cost for accessing the system, etc.
  • NACL information e.g. Mobile Terminal's (120) location, previous camped on cell information, relationship between HeNBs and HeNBs/eNBs, load condition of the system, cost for accessing the system, etc.
  • the ASCU (402) is in charge of handling the detected CSG cells based on the trigger of autonomous search procedure.
  • the Mobile Terminal (120) should perform the autonomous search procedure upon the Mobile Terminal (120) need to realize the availability of CSG cells within the Mobile Terminal (120)'s vicinity.
  • the ASCU (402) will pass this detected CSG cell to CLGU (406) via interface (404).
  • the CLGU (406) is in charge of the generating of the NACL information.
  • the CLGU (406) will base on the PCI of the detected CSG cell to access the system information of that CSG cell. From the system information, the cell identifier information, e.g. Cell identity, CSG identity, PLMN identity of the CSG cell is retrieved.
  • the Mobile Terminal (120) would use the cell identifier information to carry out a suitability check against with the allowed CSG list as stored in the Mobile Terminal (120). Once the outcome of the suitability check has conclude that the detected CSG cell is non-accessible to Mobile Terminal (120), the Mobile Terminal (120) will start to generate the NACL information by including the cell identifier information of that detected CSG cell.
  • the CLGU (406) will continue to generate the NACL information based on the availability of the detected CSG cell that is non-accessible to Mobile Terminal (120). Upon the trigger for uploading NACL information has met, the CLGU (406) will pass the NACL information to Upload Cells Control Unit (410) via interface (408).
  • the Upload Cells Control Unit (410) is in charge of uploading all the NACL information as stored in the Mobile Terminal (120) to the s_eNB (106) via uplink dedicated signaling, as shown in Figure 2.
  • the protocol used between them is as specified in [2].
  • the ASCU (402) will trigger the autonomous search procedure when the allowed CSG list as stored in Mobile Terminal (120) is non-empty, as in step 412.
  • the ASCU (402) will perform a search on the neighbouring cells to look for the availability of CSG cell, as in step 414.
  • the Mobile Terminal (120) Upon a CSG cell is detected, the Mobile Terminal (120) will base on the detected PCI of the CSG cell to perform a suitability check procedure with the stored allowed CSG list, as in step 416.
  • the ASCU (402) will determine if the detected CSG cell is accessible or non-accessible to the Mobile Terminal (120).
  • the ASCU (402) When the accessible CSG cell is determined, the ASCU (402) will continue to monitor other CSG cell within Mobile Terminal (120)'s vicinity without generating the NACL information. When the non-accessible CSG cell is determined, the ASCU (402) will generate the NACL information by including the cell identifier information of the detected CSG cell and stored this information in the Mobile Terminal (120), as in step 418. For example, upon a new NACL entry is created, the Mobile Terminal (120) will firstly categorize the NACL entry based on per PLMN type. Upon different CSG cell of each PLMN is allocated, Mobile Terminal (120) will further categorize into per Radio Access Technology (RAT) type within one PLMN type.
  • RAT Radio Access Technology
  • NACL information e.g. categorize based on same PCI with different CGI information, categorize based on same carrier frequency, etc. It is obvious to anyone skilled in the art that the other alternative of managing the NACL information does not affect the general principle of the present invention.
  • the Mobile Terminal (120) will check if the criterion for trigger the uploading of the NACL information has met, as in step 420. For example, when collected neighbour CSG cells has not been changing for a span time period, the Mobile Terminal (120) will trigger this uploading scheme by making an implicit reporting with special reporting cause.
  • the s_eNB (106) could configure a reporting criteria parameter to solely monitor for this uploading scheme. Such parameter could be based on a threshold to act as a trigger to monitor if the number of collected neighbour CSG cells has exceeded the threshold level.
  • step 420 when the upload triggered has not met, the Mobile Terminal (120) will continue to monitor other CSG cell within Mobile Terminal (120)'s vicinity. Otherwise, the Mobile Terminal (120) will configure the cells identifier report based on the NACL information, as in step 422 and upload this report to s_eNB (106) via uplink dedicated signaling, e.g. Measurement report, RRC Connection Reconfiguration Complete, RRC Connection Setup Complete, RRC Connection Reestablishment Complete as defined in [2], as in step 424.
  • uplink dedicated signaling e.g. Measurement report, RRC Connection Reconfiguration Complete, RRC Connection Setup Complete, RRC Connection Reestablishment Complete as defined in [2], as in step 424.
  • NACL information after being uploaded to s_eNB (106) from Mobile Terminal (120) should be based on certain fixed duration. For example, the following options could be adopted: 1) NACL information is valid within a connection; 2) NACL information is valid for a fixed duration period, e.g. 24 hours starting from the last update.
  • NACL information e.g. periodic update of NACL information within a connection, etc. It is obvious to anyone skilled in the art that the other alternative of updating the NACL information does not affect the general principle of the present invention.
  • the Mobile Terminal (120) will trigger the autonomous search procedure and perform the suitability check procedure on the detected CSG cell by reading the System Information Block 1 (SIB1) from the detected CSG cells via system information before decide on generating the ACL information in (502).
  • SIB1 System Information Block 1
  • the Mobile Terminal (120) should generate the intended cell identifier information, e.g. Physical Cell identity (PCI), Cell Global Identity (CGI), CSG identity (CSGID)) from the reception of the system information and stored within the ACL. For example, with the reception of system information, the Mobile Terminal (120) should access the System Information Block 1 as defined in [2] to retrieve the cell identifier information, e.g. Cell identity, Public Land Mobile Network identity and CSG identity of that detected CSG cell. Based on the reception of cell identifier information, the Mobile Terminal (120) should perform a suitability check against with the stored allowed CSG list.
  • PCI Physical Cell identity
  • CGI Cell Global Identity
  • CSG identity CSG identity
  • the Mobile Terminal (120) should generate the ACL information by including the cell identifier information of the detected CSG cell.
  • a typical ACL entry may include the following information:
  • the Mobile Terminal (120) should configure the ACL information and transmit to s_eNB (106) via uplink dedicated signaling (212), e.g. RRC Connection Setup Complete, RRC Connection Reconfiguration Complete, Measurement Report as defined in [2].
  • the s_eNB (106) Upon the measurement report is received, the s_eNB (106) will use the store ACL information to assist handover decision procedure. The s_eNB (106) should perform the checking procedure (504) as to determine if there is cell identifier present in both the stored ACL and the reported cell information. Upon same cell identifier is determined within these two configured information, the s_eNB (106) should consider this cell identifier as a candidate cell for handover procedure. For example, based on radio condition, if a CSG cell is consider as a suitable cell for handover and that CSG cell is fall within the ACL information, s_eNB (106) should consider that CSG cell is accessible and as handover candidate cell to the Mobile Terminal (120) (i.e. no acquiring of addition relevant information from that CSG cell is required).
  • the s_eNB (106) could obviate the extra operation before performing the handover execution procedure and decide on the intended cell as target cell for handover.
  • the s_eNB (106) should configure the handover configuration information and transmit to Mobile Terminal (120) via downlink dedicated signaling (220), e.g. RRC Connection Reconfiguration message as defined in [2].
  • handover decision could be decided by s_eNB (106) faster and this would greatly reduce Mobile Terminal (120) from encountering handover failure due to delay in receiving Handover Command message before Mobile Terminal (120) encounter bad radio condition.
  • the CSG List Management Unit (302) will store the ACL information, as in step 602. If the CSG List Management Unit (302) already has a stored copy of ACL information, the latest received ACL information should be used instead. In another words, the CSG List Management Unit (302) will replace the stored copy with the newly received copy of ACL information, as in step 602.
  • the ACL information should be used to assist s_eNB (106) to perform handover decision procedure, as in step 604.
  • the CSG List Management Unit (302) will perform a suitability check procedure based on the stored ACL information and the received reported cell identifier information. From the reported cell identifier information, s_eNB (106) should decide which reported PCI should adopt to perform the suitability check procedure. For example, based on radio condition, s_eNB (106) should choose the strongest cell in term of signal strength, to perform this suitability check procedure. The purpose of this checking procedure is to verify if that reported PCI of the CSG cell is accessible to the Mobile Terminal (120). Upon different PCI is detected in both the reported PCI and ACL information, the s_eNB (106) should exclude that reported PCI as candidate for handover, as in step 314.
  • s_eNB (106) should choose another reported PCI from the reported cell identifier information to perform the suitability check procedure again. For example, the second strongest cell in term of signal strength could be chosen by s_eNB (106) to perform the suitability check procedure.
  • the s_eNB (106) should consider that reported PCI as candidate for handover (i.e. that reported PCI is an accessible CSG cell for the Mobile Terminal (120)), as in step 316.
  • the Mobile Terminal (120) Upon a CSG cell is detected, the Mobile Terminal (120) will base on the detected PCI of the CSG cell to perform a suitability check procedure with the stored allowed CSG list, as in step 702.
  • the ASCU (402) will determine if the detected CSG cell is accessible or non-accessible to the Mobile Terminal (120). When the non-accessible CSG cell is determined, the ASCU (402) will continue to monitor other CSG cell within Mobile Terminal (120)'s vicinity without generating the ACL information. When the accessible CSG cell is determined, the ASCU (402) will generate the ACL information by including the cell identifier information of the detected CSG cell and stored this information in the Mobile Terminal (120), as in step 704.
  • the Mobile Terminal (120) upon a new ACL entry is created, the Mobile Terminal (120) will firstly categorize the ACL entry based on per PLMN type. Upon different CSG cell of each PLMN is allocated, Mobile Terminal (120) will further categorize into per Radio Access Technology (RAT) type within one PLMN type.
  • RAT Radio Access Technology
  • the Mobile Terminal (120) will check if the criteria to trigger the uploading of the ACL information had met, as in step 706. For example, when collected neighbour CSG cells has not been changing for a span time period, the Mobile Terminal (120) will trigger this uploading scheme by making an implicit reporting with special reporting cause.
  • the s_eNB (106) could configure a reporting criteria parameter to solely monitor for this uploading scheme. Such parameter could be based on a threshold to act as a trigger to monitor if the number of collected neighbour CSG cells has exceeded the threshold level.
  • step 706 when the criteria has not met, the Mobile Terminal (120) will continue to monitor other CSG cell within Mobile Terminal (120)'s vicinity. Otherwise, the Mobile Terminal (120) will configure the cells identifier report based on the ACL information and upload this report to s_eNB (106) via uplink dedicated signaling, e.g. Measurement report, RRC Connection Reconfiguration Complete, RRC Connection Setup Complete, RRC Connection Reestablishment Complete as defined in [2].
  • uplink dedicated signaling e.g. Measurement report, RRC Connection Reconfiguration Complete, RRC Connection Setup Complete, RRC Connection Reestablishment Complete as defined in [2].
  • ACL information after being uploaded to s_eNB (106) from Mobile Terminal (120) should be based on certain fixed duration. For example, the following options could be adopted: 1) ACL information is valid within a connection; 2) ACL information is valid for a fixed duration period, e.g. 24 hours starting from the last update.
  • the Mobile Terminal (120) would implicit trigger the uploading of the NACL information when the criteria had met.
  • the Mobile Terminal (120) is situated in a dense CSG cell deployment and is establishing multiples attempt of connection to the network at the same location, e.g. making multiple voice calls in the cafe.
  • duplicate NACL information would be uploaded to the s_eNB (106) from the Mobile Terminal (120) is expected.
  • the Mobile Terminal (120) Upon the criteria for uploading the NACL information has met, the Mobile Terminal (120) should assure that the s_eNB (106) do request for an upload of the NACL information by performing a checking procedure against with a configured control parameter, as in step 802. For example, a "Boolean" flag is configured to Mobile Terminal (120) by setting True or False. When flag set as True, the Mobile Terminal (120) should upload the NACL information to s_eNB (106). When flag set as False, the Mobile Terminal (120) should not upload the NACL information to s_eNB (106).
  • An alternative approach is to configure an "Uploading Guideline" parameter to Mobile Terminal (120).
  • the Mobile Terminal (120) could base on certain rules to decide if uploading is required or not. For example, when a new non-accessible CSG cell is detected and over a span of time period without changing, the Mobile Terminal (120) would upload the NACL information to s_eNB (106). Otherwise, uploading of NACL information is not required.
  • this control parameter is configured by s_eNB (106) and transmits to Mobile Terminal (120) via downlink dedicated signaling, e.g. RRC Connection Setup, RRC Connection Reconfiguration as defined in [2].
  • the Mobile Terminal (120) When the uploading request criteria has met, the Mobile Terminal (120) would configured the cell identifier report based on the NACL information and transmits to s_eNB via uplink dedicated signaling, e.g. RRC Connection Setup Complete, RRC Connection Reconfiguration Complete, Measurement report as defined in [2]. Otherwise, the Mobile Terminal (120) would continue to monitor other CSG cell within Mobile Terminal (120)'s vicinity. Thus, the signaling load issue due to Mobile Terminal (120) would transmit duplicated NACL information is resolved.
  • control the uploading of NACL information by s_eNB (106) is just one of the possible approaches. There may be alternative approaches, such as the Mobile Terminal (120) would only upload the NACL information to s_eNB (106) when a new non-accessible CSG cell detected.
  • the Mobile Terminal (120) Upon the modification of the stored CSG list, e.g. the modification of allowed CSG list as stored in Mobile Terminal (120), as in step 902, the Mobile Terminal (120) would perform a checking procedure for the recent uploaded NACL information, as in step 904. In step 904, the Mobile Terminal (120) should perform a checking procedure on the Mobile Terminal (120) stored allowed CSG list with the recent uploaded NACL information.
  • the Mobile Terminal (120) When PCI as stored in allowed CSG list is not present in the recent uploaded NACL information, the Mobile Terminal (120) will continue to monitor other CSG cell within Mobile Terminal (120)'s vicinity and consider the recent uploaded NACL information is still valid.
  • PCI as stored in the allowed CSG list is present in the recent uploaded NACL information, the Mobile Terminal (120) should consider the recent uploaded NACL information is invalid.
  • the Mobile Terminal (120) should notify this invalidity of the NACL information to s_eNB (106), as in step 906. For example, after a non-accessible CSG cell has become an accessible CSG cell and has included in the Mobile Terminal's (120) allowed CSG list or due to power "ON"/"OFF" of CSG cells within Mobile Terminal's (120) vicinity, the Mobile Terminal (120) will send a "notification" flag to s_eNB (106) via an uplink dedicated signaling, e.g. RRC Connection Reconfiguration Complete or Measurement Report as defined in [2]. Upon realize the invalidity of the NACL information, the s_eNB (106) should stop using the NACL information to perform handover mobility procedure and wait for the update NACL information. The Mobile Terminal (120) would trigger autonomous search procedure as to re-generate and upload the updated NACL information to s_eNB (106). Thus, with this validity check scheme, the uploaded NACL information as stored in s_eNB (106) is guaranteed.
  • s_eNB
  • validity checking for NACL information by Mobile Terminal (120) is just one of the possible approaches.
  • a control parameter is configured to Mobile Terminal (120) to check if the speed for Mobile Terminal (120) is fast or slow.
  • a configured threshold parameter to monitor the "speed elements"of the Mobile Terminal (120).
  • the "speed elements” can refer as 1) range of fading signal; 2) number of handover attempts; or 3) number of updating the NACL information to s_eNB (106) over a span time interval.
  • the Mobile Terminal (120) Upon high mobility environment for the Mobile Terminal (120) is detected, the Mobile Terminal (120) will terminate the uploading of the NACL information, as in step 1004. In this case, the Mobile Terminal's (120) should stop uploading NACL information to s_eNB (106), as in step 1006.
  • the s_eNB (106) should not use NACL information for handover mobility procedure. For example, when the "speed elements"is above the threshold parameter, the Mobile Terminal (120) will stop uploading the NACL information to s_eNB (106) and consider all detected CSG cells within Mobile Terminal's (120) vicinity are not candidate for handover. Thus, the Mobile Terminal's (120) should only report macro cells to s_eNB (106) for handover mobility procedure.
  • NACL information is just one of the possible approaches.
  • the s_eNB (106) can simply ignore the NACL information and handover to a macro cell.

Abstract

Selon la présente invention, afin qu'un terminal mobile effectue un transfert vers une cellule de groupe d'abonnés fermé (CSG), il est nécessaire de fournir des informations appropriées pour que le réseau identifie la cellule cible, par exemple l'identité globale de cellule (CGI), l'identité de groupe d'abonnés fermé (CSGID). Ces informations doivent être utilisées pour effectuer la vérification de contrôle d'accès entre un réseau fédérateur (à savoir une entité MME) et une station de base (à savoir un nœud eNB). Toutefois, en considérant comme non accessibles des cellules de groupe CSG cibles voisines qui se trouvent à proximité du terminal mobile, on s'attend à plusieurs tentatives d'interaction entre l'entité MME et le nœud eNB. De plus, pour récupérer des informations appropriées provenant de la cellule de groupe CSG cible, la station de base doit configurer le terminal mobile pour une mesure supplémentaire. Ceci peut retarder fortement le processus de transfert intercellulaire. La présente invention se rapporte à un procédé permettant de générer et de téléverser la liste d'informations concernant des cellules de groupe CSG non accessibles vers la station de base. En se servant de ces informations, la station de base peut exclure des cellules de cette liste téléversée comme étant des cellules candidates pour un transfert intercellulaire. La présente invention se rapporte également à un procédé alternatif permettant de téléverser vers la station de base une liste d'informations concernant des cellules de groupe CSG accessibles. La présente invention se rapporte également à des variantes qui permettent à la station de base de commander la technique de téléversement ; de surveiller la validité des informations de cellule téléversées ; et de supporter la technique de téléversement du terminal mobile dans un environnement à forte mobilité. Avec ce mécanisme, on peut éviter un échec de transfert intercellulaire.
PCT/JP2009/003659 2009-07-31 2009-07-31 Procédé et appareil permettant une commande de préparation de transfert intercellulaire intrant dans un système de communication mobile WO2011013178A1 (fr)

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