WO2011039960A1 - 移動体通信システム - Google Patents
移動体通信システム Download PDFInfo
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- WO2011039960A1 WO2011039960A1 PCT/JP2010/005625 JP2010005625W WO2011039960A1 WO 2011039960 A1 WO2011039960 A1 WO 2011039960A1 JP 2010005625 W JP2010005625 W JP 2010005625W WO 2011039960 A1 WO2011039960 A1 WO 2011039960A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/08—Reselecting an access point
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Definitions
- the present invention relates to a mobile communication system that performs wireless communication between a plurality of mobile terminals and a base station.
- the W-CDMA Wideband Code Division Multiple Access
- HS-DSCH High Speed-Downlink Shared Channel
- HSDPA High Speed Down Link Link Packet Access
- HSUPA High Speed Up Link Link Packet Access
- LTE Long Term Evolution LTE
- SAE Architecture Evolution
- LTE the access scheme, radio channel configuration, and protocol are completely different from those of the current W-CDMA (HSDPA / HSUPA).
- W-CDMA uses code division multiple access (Code-Division-Multiple-Access)
- LTE has OFDM (Orthogonal-Frequency-Division-Multiplexing) in the downlink direction and SC-FDMA (Single in the uplink direction).
- the bandwidth is selectable for each base station within 1.4 / 3/5/10/15/20 MHz in LTE, whereas W-CDMA is 5 MHz. Also, LTE does not include circuit switching as in W-CDMA, and only packet communication is used.
- LTE is defined as an independent radio access network separate from the W-CDMA network because the communication system is configured using a new core network different from the W-CDMA core network (GPRS). Therefore, in order to distinguish from a W-CDMA communication system, in an LTE communication system, a base station (Base station) that communicates with a mobile terminal (UE: User Equipment) is an eNB (E-UTRAN NodeB), and a plurality of base stations A base station controller (Radio Network Controller) that exchanges control data and user data is called an EPC (Evolved Packet Core) (aGW: sometimes called Access Gateway).
- EPC Evolved Packet Core
- aGW sometimes called Access Gateway
- the E-MBMS service is a broadcast-type multimedia service and may be simply referred to as MBMS.
- Mass broadcast contents such as news, weather forecasts, and mobile broadcasts are transmitted to a plurality of mobile terminals. This is also called a point-to-multipoint service.
- Non-Patent Document 1 describes current decisions regarding the overall architecture (Architecture) in the LTE system in 3GPP.
- the overall architecture (Non-Patent Document 1, Chapter 4.6.1) will be described with reference to FIG.
- FIG. 1 is an explanatory diagram illustrating a configuration of an LTE communication system.
- a control protocol for example, RRC (Radio Resource Management)
- a user plane for example, PDCP: Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- PHY Physical Layer
- E-UTRAN Evolved Universal Terrestrial Radio Access
- the base station 102 performs scheduling (scheduling) and transmission of a paging signal (also referred to as a paging signal or paging message) notified from the MME 103 (mobility management entity).
- Base stations 102 are connected to each other via an X2 interface.
- the base station 102 is connected to the EPC (Evolved Packet Core) via the S1 interface, more specifically, connected to the MME 103 (Mobility Management Entity) via the S1_MME interface, and connected to the S-GW 104 (Serving Gateway) via the S1_U interface.
- the MME 103 distributes the paging signal to a plurality or a single base station 102.
- the MME 103 performs mobility control (Mobility control) in a standby state (Idle State).
- the MME 103 manages a tracking area (Tracking Area) list when the mobile terminal is in a standby state and an active state (Active State).
- the S-GW 104 transmits / receives user data to / from one or a plurality of base stations 102.
- the S-GW 104 becomes a local mobility anchor point (Mobility Anchor Point) during handover between base stations.
- P-GW PDN ⁇ Gateway
- the control protocol RRC between the mobile terminal 101 and the base station 102 performs broadcast, paging, RRC connection management (RRC connection management), and the like.
- RRC_Idle and RRC_CONNECTED are states of the base station and the mobile terminal in RRC.
- RRC_IDLE PLMN (Public Land Mobile Mobile Network) selection, system information (System information, SI) notification, paging, cell re-selection, mobility, and the like are performed.
- RRC_CONNECTED a mobile terminal has RRC connection (connection), can transmit / receive data to / from the network, and performs handover (Handover, HO), measurement of a neighbor cell (Neighbour cell), and the like.
- Non-Patent Document 1 (Chapter 5) describes the current decisions regarding the frame configuration in the LTE system in 3GPP. This will be described with reference to FIG.
- FIG. 2 is an explanatory diagram showing a configuration of a radio frame used in the LTE communication system.
- one radio frame (Radio frame) is 10 ms.
- the radio frame is divided into 10 equally sized sub-frames.
- the subframe is divided into two equally sized slots.
- a downlink synchronization signal (Downlink Synchronization Signal: SS) is included in the first and sixth subframes for each radio frame.
- SS Downlink Synchronization Signal
- the synchronization signal includes a first synchronization signal (Primary Synchronization Signal: P-SS) and a second synchronization signal (Secondary Synchronization Signal: S-SS).
- P-SS Primary Synchronization Signal
- S-SS Secondary Synchronization Signal
- Channels other than MBSFN (Multimedia (Broadcast multicast service Single Frequency Network) and channels other than MBSFN are performed on a subframe basis.
- MBSFN subframe MBSFN subframe
- Non-Patent Document 2 describes a signaling example at the time of MBSFN subframe allocation.
- FIG. 3 is an explanatory diagram showing the configuration of the MBSFN frame.
- an MBSFN subframe is allocated for each MBSFN frame (MBSFN frame).
- a set of MBSFN frames (MBSFN frame Cluster) is scheduled.
- a repetition period (Repetition Period) of a set of MBSFN frames is assigned.
- Non-Patent Document 1 describes the current decisions regarding the channel configuration in the LTE system in 3GPP. It is assumed that the same channel configuration as a non-CSG cell is used in a CSG (Closed ⁇ Subscriber-Group cell) cell.
- a physical channel (Non-Patent Document 1, Chapter 5) will be described with reference to FIG.
- FIG. 4 is an explanatory diagram illustrating physical channels used in the LTE communication system.
- a physical broadcast channel 401 PhysicalPhysBroadcast channel: PBCH
- PBCH Physical PhysicalPhysBroadcast channel
- the BCH transport block transport block
- a physical control channel format indicator channel 402 (Physical Control indicator channel: PCFICH) is transmitted from the base station 102 to the mobile terminal 101. PCFICH notifies base station 102 to mobile terminal 101 about the number of OFDM symbols used for PDCCHs. PCFICH is transmitted for each subframe.
- a physical downlink control channel 403 (Physical downlink control channel: PDCCH) is a downlink channel transmitted from the base station 102 to the mobile terminal 101. PDCCH includes resource allocation, HARQ information regarding DL-SCH (downlink shared channel which is one of the transport channels shown in FIG. 5), and PCH (paging which is one of the transport channels shown in FIG. 5). Channel).
- the PDCCH carries an uplink scheduling grant (Uplink Scheduling Grant).
- the PDCCH carries ACK / Nack that is a response signal for uplink transmission.
- PDCCH is also called an L1 / L2 control signal.
- a physical downlink shared channel 404 (Physical downlink shared channel: PDSCH) is a downlink channel transmitted from the base station 102 to the mobile terminal 101. PDSCH is mapped with DL-SCH (downlink shared channel) which is a transport channel and PCH which is a transport channel.
- a physical multicast channel 405 (Physical multicast channel: PMCH) is a downlink channel transmitted from the base station 102 to the mobile terminal 101. PMCH is mapped with MCH (multicast channel) which is a transport channel.
- a physical uplink control channel 406 (Physical Uplink control channel: PUCCH) is an uplink channel transmitted from the mobile terminal 101 to the base station 102.
- the PUCCH carries ACK / Nack which is a response signal (response) to downlink transmission.
- the PUCCH carries a CQI (Channel Quality Indicator) report.
- CQI is quality information indicating the quality of received data or channel quality.
- the PUCCH carries a scheduling request (Scheduling Request: SR).
- a physical uplink shared channel 407 (Physical Uplink shared channel: PUSCH) is an uplink channel transmitted from the mobile terminal 101 to the base station 102.
- a physical HARQ indicator channel 408 Physical Hybrid ARQ indicator: PHICH
- the PHICH carries ACK / Nack that is a response to uplink transmission.
- a physical random access channel 409 Physical random access channel: PRACH
- PRACH Physical random access channel
- a symbol known as a mobile communication system is inserted into the first, third and last OFDM symbols of each slot.
- RSRP reference symbol received power
- FIG. 5 is an explanatory diagram for explaining a transport channel used in an LTE communication system.
- FIG. 5A shows mapping between the downlink transport channel and the downlink physical channel.
- FIG. 5B shows mapping between the uplink transport channel and the uplink physical channel.
- a broadcast channel (Broadcast channel: BCH) is broadcast to the entire base station (cell).
- BCH is mapped to the physical broadcast channel (PBCH).
- Retransmission control by HARQ Hybrid ARQ
- DL-SCH Downlink Shared channel
- Broadcasting to the entire base station (cell) is possible.
- Quasi-static resource allocation is also called Persistent Scheduling.
- DRX Discontinuous reception
- the DL-SCH is mapped to the physical downlink shared channel (PDSCH).
- a paging channel (Paging channel: PCH) supports DRX of the mobile terminal in order to enable low power consumption of the mobile terminal. Notification to the entire base station (cell) is required. It is mapped to a physical resource such as a physical downlink shared channel (PDSCH) that can be dynamically used for traffic, or a physical resource such as a physical downlink control channel (PDCCH) of another control channel.
- PDSCH physical downlink shared channel
- PDCCH physical downlink control channel
- Multicast channel is used for broadcasting to the entire base station (cell).
- MCH multicast channel
- MCH is mapped to PMCH.
- Retransmission control by HARQ is applied to the uplink shared channel (Uplink Shared channel: UL-SCH).
- Uplink Shared channel: UL-SCH Uplink Shared channel: UL-SCH.
- the UL-SCH is mapped to the physical uplink shared channel (PUSCH).
- the random access channel (Random access channel: RACH) shown in FIG. 5B is limited to control information. There is a risk of collision.
- the RACH is mapped to a physical random access channel (PRACH).
- HARQ is a technique for improving the communication quality of a transmission path by combining automatic retransmission (AutomaticAutoRepeat reQuest) and error correction (Forward Error Correction).
- error correction functions effectively by retransmission even for a transmission path in which communication quality changes.
- further quality improvement can be obtained by combining the reception result of the initial transmission and the reception result of the retransmission upon retransmission.
- the transmission side that has received “Nack” retransmits the data.
- “Ack” is transmitted from the reception side to the transmission side.
- the transmitting side that has received “Ack” transmits the next data.
- An example of the HARQ system is “Chase Combining”. Chase combining is to transmit the same data sequence for initial transmission and retransmission, and is a method for improving gain by combining the initial transmission data sequence and the retransmission data sequence in retransmission.
- IR Intelligent Redundancy
- FIG. 6 is an explanatory diagram illustrating logical channels used in the LTE communication system.
- FIG. 6A shows mapping between the downlink logical channel and the downlink transport channel.
- FIG. 6B shows mapping between the uplink logical channel and the uplink transport channel.
- the broadcast control channel (Broadcast control channel: CHBCCH) is a downlink channel for broadcast system control information.
- the BCCH that is a logical channel is mapped to a broadcast channel (BCH) that is a transport channel or a downlink shared channel (DL-SCH).
- a paging control channel (Paging control channel: PCCH) is a downlink channel for transmitting a paging signal.
- PCCH paging control channel
- PCCH is used when the network does not know the cell location of the mobile terminal.
- the PCCH that is a logical channel is mapped to a paging channel (PCH) that is a transport channel.
- the shared control channel (Common control channel: CCCC) is a channel for transmission control information between the mobile terminal and the base station.
- CCCH is used when the mobile terminal does not have an RRC connection with the network.
- the CCCH is mapped to a downlink shared channel (DL-SCH) that is a transport channel.
- DL-SCH downlink shared channel
- UL-SCH uplink shared channel
- the multicast control channel (Multicast control channel: MCCH) is a downlink channel for one-to-many transmission. This is a channel used for transmission of MBMS control information for one or several MTCHs from the network to the mobile terminal.
- MCCH is a channel used only for a mobile terminal receiving MBMS.
- MCCH is mapped to a downlink shared channel (DL-SCH) or multicast channel (MCH) which is a transport channel.
- the dedicated control channel (Dedicated control channel: DCCH) is a channel that transmits dedicated control information between the mobile terminal and the network.
- the DCCH is mapped to the uplink shared channel (UL-SCH) in the uplink, and is mapped to the downlink shared channel (DL-SCH) in the downlink.
- the dedicated traffic channel (Dedicate Traffic channel: DTCH) is a channel for one-to-one communication to an individual mobile terminal for transmitting user information.
- DTCH exists for both uplink and downlink.
- the DTCH is mapped to the uplink shared channel (UL-SCH) in the uplink, and is mapped to the downlink shared channel (DL-SCH) in the downlink.
- a multicast traffic channel (Multicast Traffic channel: MTCH) is a downlink channel for transmitting traffic data from a network to a mobile terminal.
- MTCH is a channel used only for a mobile terminal that is receiving MBMS.
- the MTCH is mapped to the downlink shared channel (DL-SCH) or multicast channel (MCH).
- GCI is a global cell identity.
- a CSG cell (Closed Subscriber Group cell) is introduced in LTE and UMTS (Universal Mobile Telecommunication System). CSG will be described below (Chapter 3.1 of Non-Patent Document 3).
- a CSG (Closed Subscriber Group) is a cell in which an operator identifies an available subscriber (a cell for a specific subscriber). The identified subscriber is allowed to access one or more E-UTRAN cells of the Public Land Mobile Network (PLMN). One or more E-UTRAN cells to which the identified subscribers are allowed access are referred to as “CSG cell (s)”. However, PLMN has access restrictions.
- a CSG cell is a part of a PLMN that broadcasts a unique CSG identity (CSG identity: CSG ID, CSG-ID). Members of the subscriber group who have been registered for use in advance and access the CSG cell using the CSG-ID as access permission information.
- the CSG-ID is broadcast by the CSG cell or the cell.
- the CSG-ID is then used by the mobile terminal (UE) to facilitate access of CSG related members.
- the location tracking of the mobile terminal is performed in units of areas composed of one or more cells.
- the position tracking is to enable tracking of the position of the mobile terminal and calling (the mobile terminal receives a call) even in the standby state.
- the CSG white list is a list stored in the USIM in which all CSG IDs of the CSG cells to which the subscriber belongs are recorded.
- the CSG white list may be referred to as an allowed CSG ID list.
- Suitable cell will be described below (Chapter 4.3 of Non-Patent Document 3).
- a “suitable cell” is a cell that the UE camps on to receive normal service. Such a cell was provided by (1) the selected PLMN or registered PLMN, or part of a PLMN in the “Equivalent PLMN list”, (2) NAS (non-access stratum) The latest information must satisfy the following conditions: (a) The cell is not a barred cell. (B) The cell is not part of the “Prohibited LAs for roaming” list, but part of at least one tracking area (Tracking Area: TA).
- the cell needs to satisfy the above (1), (c) the cell satisfies the cell selection evaluation criteria, (d) the cell is a system information (System Information: SI) as a CSG cell. ),
- SI System Information
- the CSG-ID is part of the UE's “CSG White List” (CSG White List) (included in the UE CSG White List).
- “Acceptable cell” will be described below (Chapter 4.3 of Non-Patent Document 3). This is a cell where the UE camps on in order to receive a limited service (emergency call). Such a cell shall meet all the following requirements: That is, the minimum set of requirements for initiating an emergency call in an E-UTRAN network is shown below. (1) The cell is not a barred cell. (2) The cell satisfies the cell selection evaluation criteria.
- camping on a cell means that the UE has completed cell selection / reselection processing and the UE has selected a cell for monitoring system information and paging information.
- Non-Patent Document 4 discloses three different modes of access to HeNB and HNB.
- An open access mode Open access mode
- a closed access mode Click access mode
- a hybrid access mode Hybrid access mode
- Each mode has the following characteristics.
- the HeNB or HNB is operated as a normal cell of a normal operator.
- the closed access mode the HeNB or HNB is operated as a CSG cell.
- a non-CSG member is a CSG cell to which access is permitted at the same time.
- the cell in the hybrid access mode is a cell that supports both the open access mode and the closed access mode.
- a cell in the hybrid access mode is also referred to as a hybrid cell.
- HeNB HeNB
- a UE that is a member of a certain CSG needs to be able to access a CSG cell belonging to the same CSG with priority over other cells.
- Preferential access of UEs that are CSG members may also be applied to hybrid cells.
- a hybrid cell is a CSG cell in which both CSG members and non-CSG members are allowed access simultaneously. Therefore, in the hybrid cell, it is necessary to make the CSG member accessed in the closed access mode preferentially accessible over the non-CSG member accessed in the open access mode.
- non-CSG members are given to the hybrid cell by giving priority to the UE of the CSG member to the hybrid cell or during cell reselection from the hybrid cell. It has been proposed to stay longer than other UEs (Non-Patent Document 7). As another method, it has been proposed to redirect a non-CSG member UE to another cell when the hybrid cell is in a congestion state (Non-Patent Document 8).
- Non-Patent Document 7 as a method for making a CSG member preferentially accessible in a hybrid cell, the UE of the CSG member at the time of cell reselection to or from the hybrid cell is proposed. If the hybrid cell is allowed to stay longer than the non-CSG member UE, the coverage in the closed access mode may become wider than the coverage in the open access mode. In such a case, areas where the access destinations of the CSG member UE and the non-CSG member UE are different, and a large interference occurs due to mutual UE access.
- An object of the present invention is to provide a mobile communication system capable of eliminating a communication area in which a base station as an access destination is different between a mobile terminal in a closed mode and a mobile terminal in an open mode.
- the present invention provides a closed mode access from a mobile terminal included in the same access group to a base station included in the access group when an access group including one or more mobile terminals and one or more base stations is registered.
- a mobile communication system that permits a hybrid to open mode access from mobile terminals not included in the same access group,
- the mobile communication system is characterized in that the communication area of the base station in the open mode and the communication area of the base station in the closed mode are the same.
- the base station in the open mode and the communication area of the base station in the closed mode are the same, the base station that is the access destination between the mobile terminal in the closed mode and the mobile terminal in the open mode Different communication areas can be eliminated, and interference can be greatly reduced.
- FIG. 2 is an explanatory diagram showing a configuration of a radio frame used in an LTE communication system. It is explanatory drawing which shows the structure of a MBSFN (Multimedia
- MBSFN Multimedia
- FIG. 7 is a block diagram showing the overall configuration of an LTE mobile communication system currently under discussion in 3GPP.
- CSG Cell Subscriber Group
- e-UTRAN Home-eNodeB Home-eNodeB
- HNB UTRAN Home-NB
- eNB eNodeB
- NB UTRAN NodeB
- GERAN BSS GERAN BSS
- a mobile terminal (UE) 71 performs transmission / reception with the base station 72.
- the base station 72 is classified into an eNB (non-CSG cell) 72-1 and a Home-eNB 72-2.
- the eNB 72-1 is connected to the MME 73 via the interface S1, and control information is communicated between the eNB and the MME.
- a plurality of MMEs 73 are connected to one eNB 72-1.
- the eNBs are connected by an interface X2, and control information is communicated between the eNBs.
- the Home-eNB 72-2 is connected to the MME 73 via the interface S1, and control information is communicated between the Home-eNB and the MME.
- a plurality of Home-eNBs are connected to one MME.
- the Home-eNB 72-2 is connected to the MME 73 via a HeNBGW (Home-eNB Gateway) 74.
- the Home-eNB and the HeGW are connected via the interface S1, and the HeNBGW 74 and the MME 73 are connected via the interface S1.
- One or a plurality of Home-eNBs 72-2 are connected to one HeNBGW 74, and information is communicated through S1.
- the HeNBGW 74 is connected to one or a plurality of MMEs 73, and information is communicated through S1.
- the interface X2 between the Home-eNB 72-2 is not supported. From the MME 73, the HeNBGW 74 appears as an eNB 72-1. From the Home-eNB 72-2, the HeNBGW 74 appears as an MME 73. Regardless of whether the Home-eNB 72-2 is connected to the EPC via the HeNBGW 74, the interface S1 between the Home-eNB 72-2 and the EPC is the same. Mobility to or from Home-eNB 72-2 that spans MME 73 is not supported. Home-eNB 72-2 supports only one cell.
- FIG. 8 is a block diagram showing a configuration of a mobile terminal (terminal 71 in FIG. 7) according to the present invention. Transmission processing of the mobile terminal shown in FIG. 8 will be described. First, control data from the protocol processing unit 801 and user data from the application unit 802 are stored in the transmission data buffer unit 803. The data stored in the transmission data buffer unit 803 is transferred to the encoder unit 804 and subjected to encoding processing such as error correction. There may exist data that is directly output from the transmission data buffer unit 803 to the modulation unit 805 without being encoded. The data encoded by the encoder unit 804 is subjected to modulation processing by the modulation unit 805.
- the modulated data is converted into a baseband signal, and then output to the frequency conversion unit 806 where it is converted into a radio transmission frequency. Thereafter, a transmission signal is transmitted from the antenna 807 to the base station 312.
- the reception process of the mobile terminal 311 is executed as follows.
- a radio signal from the base station 312 is received by the antenna 807.
- the reception signal is converted from a radio reception frequency to a baseband signal by the frequency conversion unit 806, and demodulated by the demodulation unit 808.
- the demodulated data is transferred to the decoder unit 809 and subjected to decoding processing such as error correction.
- control data is passed to the protocol processing unit 801, and user data is passed to the application unit 802.
- a series of processing of the mobile terminal is controlled by the control unit 810. Therefore, the control unit 810 is connected to each unit (801 to 809), which is omitted in the drawing.
- FIG. 9 is a block diagram showing the configuration of the base station (base station 72 in FIG. 7) according to the present invention. A transmission process of the base station shown in FIG. 9 will be described.
- the EPC communication unit 901 transmits and receives data between the base station 72 and EPC (MME73, HeNBGW74, etc.).
- the other base station communication unit 902 transmits / receives data to / from other base stations. Since the interface X2 between the Home-eNB 72-2 is a direction that is not supported, the Home-eNB 72-2 may not include the other base station communication unit 902.
- the EPC communication unit 901 and the other base station communication unit 902 exchange information with the protocol processing unit 903, respectively.
- Control data from the protocol processing unit 903 and user data and control data from the EPC communication unit 901 and the other base station communication unit 902 are stored in the transmission data buffer unit 904.
- Data stored in the transmission data buffer unit 904 is transferred to the encoder unit 905 and subjected to encoding processing such as error correction.
- the encoded data is subjected to modulation processing by the modulation unit 906.
- the modulated data is converted into a baseband signal, and then output to the frequency conversion unit 907 to be converted into a radio transmission frequency. Thereafter, a transmission signal is transmitted from the antenna 908 to one or a plurality of mobile terminals 71.
- the reception process of the base station 72 is executed as follows. Radio signals from one or a plurality of mobile terminals 311 are received by the antenna 908. The received signal is converted from a radio reception frequency to a baseband signal by the frequency conversion unit 907, and demodulated by the demodulation unit 909. The demodulated data is transferred to the decoder unit 910, and decoding processing such as error correction is performed. Of the decoded data, the control data is passed to the protocol processing unit 903 or the EPC communication unit 901 and the other base station communication unit 902, and the user data is passed to the EPC communication unit 901 and the other base station communication unit 902. A series of processing of the base station 72 is controlled by the control unit 911. Therefore, the control unit 911 is connected to each unit (901 to 910), which is omitted in the drawing.
- Home-eNB 72-2 has the same function as eNB 72-1.
- it when connecting with HeNBGW74, it has the function shown below. It has a function of finding an appropriate serving HeNBGW 74.
- the Home-eNB 72-2 is only connected to one HeNBGW 74, that is, when connected to the HeNBGW 74, the Home-eNB 72-2 does not use the Flex function in S1.
- the Home-eNB 72-2 is connected to the HeNBGW 74, it is not simultaneously connected to another HeNBGW 74 or another MME 73.
- the TAC and PLMN ID of the Home-eNB 72-2 are supported by the HeNBGW 74.
- the selection of the MME 73 in “UE attachment” is performed by the HeNBGW 74 instead of the Home-eNB 72-2.
- Home-eNB 72-2 may be deployed without network planning. Thus, Home-eNB 72-2 may be moved from one geographic region to another. It may therefore be necessary to connect to different HeNBGWs 74 by location.
- FIG. 10 is a block diagram showing a configuration of MME (Mobility Management Entity) according to the present invention.
- the PDN GW communication unit 1001 transmits and receives data between the MME 73 and the PDN GW.
- the base station communication unit 1002 transmits and receives data between the MME 73 and the base station 72 using the S1 interface.
- the data received from the PDN GW is user data
- the user data is passed from the PDN GW communication unit 1001 to the base station communication unit 1002 via the user plane processing unit 1003 and transmitted to one or a plurality of base stations 72.
- the data received from the base station 72 is user data
- the user data is transferred from the base station communication unit 1002 to the PDN GW communication unit 1001 via the user plane processing unit 1003 and transmitted to the PDN GW.
- the control data is passed from the PDN GW communication unit 1001 to the control plane control unit 1005.
- the control data is transferred from the base station communication unit 1002 to the control plane control unit 1005.
- the HeNBGW communication unit 1004 is provided when the HeNBGW 74 exists, and performs data transmission / reception through an interface (IF) between the MME 73 and the HeNBGW 74 depending on the information type.
- the control data received from the HeNBGW communication unit 1004 is passed from the HeNBGW communication unit 1004 to the control plane control unit 1005.
- the result of processing in the control plane control unit 1005 is transmitted to the PDN GW via the PDN GW communication unit 1001.
- control plane control unit 1005 is transmitted to one or a plurality of base stations 72 via the S1 interface via the base station communication unit 1002, and to one or a plurality of HeNBGWs 74 via the HeNBGW communication unit 1004. Sent.
- the control plane control unit 1005 includes a NAS security unit 1005-1, an SAE bearer control unit 1005-2, an idle state mobility management unit 1005-3, and the like, and performs overall processing for the control plane.
- the NAS security unit 1005-1 performs security of a NAS (Non-Access Stratum) message.
- the SAE bearer control unit 1005-2 manages the bearer of SAE (System Architecture Evolution).
- the idle state mobility management unit 1005-3 performs mobility management in a standby state (LTE-IDLE state, also simply referred to as idle), generation and control of a paging signal in the standby state, and one or more mobile terminals 71 being served thereby Tracking area (TA) addition, deletion, update, search, tracking area list (TA List) management and so on.
- TA Tracking area
- the MME initiates the paging protocol by transmitting a paging message to a cell belonging to a tracking area (tracking area: tracking TA) where the UE is registered.
- the idle state mobility management unit 1005-3 may perform CSG management, CSG-ID management, and white list management of the Home-eNB 72-2 connected to the MME.
- CSG-ID the relationship between the mobile terminal corresponding to the CSG-ID and the CSG cell is managed (added, deleted, updated, searched). For example, it may be a relationship between one or a plurality of mobile terminals registered for user access with a certain CSG-ID and a CSG cell belonging to the CSG-ID.
- the relationship between a mobile terminal and a CSG-ID is managed (added, deleted, updated, searched). For example, one or a plurality of CSG-IDs registered by a certain mobile terminal as a user may be stored in the white list. Management related to these CSGs may be performed in other parts of the MME 73.
- a series of processing of the MME 313 is controlled by the control unit 1006. Therefore, although not shown in the drawing, the control unit 1006 is connected to each unit (1001 to 1005).
- MME73 performs access control for one or a plurality of mobile terminals of CSG (Closed Subscriber Groups). Execution of paging optimization (Paging optimization) is accepted as an option.
- CSG Cell Subscriber Groups
- Paging optimization Paging optimization
- FIG. 11 is a block diagram showing a configuration of the HeNBGW according to the present invention.
- the EPC communication unit 1101 transmits and receives data between the HeNBGW 74 and the MME 73 using the S1 interface.
- the base station communication unit 1102 transmits and receives data between the HeNBGW 74 and the Home-eNB 72-2 using the S1 interface.
- the location processing unit 1103 performs processing for transmitting registration information and the like to a plurality of Home-eNBs among data from the MME 73 passed via the EPC communication unit 1101.
- the data processed by the location processing unit 1103 is passed to the base station communication unit 1102 and transmitted to one or more Home-eNBs 72-2 via the S1 interface.
- Data that does not require processing in the location processing unit 1103 and is simply passed (transmitted) is passed from the EPC communication unit 1101 to the base station communication unit 1102 and sent to one or more Home-eNBs 72-2 via the S1 interface. Sent.
- a series of processing of the HeNBGW 74 is controlled by the control unit 1104. Therefore, although not shown in the drawing, the control unit 1104 is connected to each unit (1101 to 1103).
- Non-Patent Document 1 The functions of the HeNBGW 74 currently being discussed in 3GPP are shown below (Non-Patent Document 1, chapters 4, 6 and 2). Relay for S1 application.
- the S1 application that is a part of the procedure of the MME 73 to the Home-eNB 72-2 but is not related to the mobile terminal 71 is terminated.
- procedures unrelated to the mobile terminal 71 are communicated between the Home-eNB 72-2 and the HeNBGW 74, and between the HeNBGW 74 and the MME 73.
- the interface X2 is not set between the HeNBGW 74 and other nodes. Execution of paging optimization (Paging optimization) is accepted as an option.
- FIG. 12 is a flowchart illustrating an outline from a cell search to a standby operation performed by a mobile terminal (UE) in an LTE communication system.
- UE mobile terminal
- FIG. 12 is a flowchart illustrating an outline from a cell search to a standby operation performed by a mobile terminal (UE) in an LTE communication system.
- P-SS first synchronization signal
- S-SS second synchronization signal
- Synchronize In combination with P-SS and S-SS, a synchronization code (SS) is assigned a synchronization code corresponding to a PCI (Physical Cell Identity) allocated for each cell.
- PCI Physical Cell Identity
- a reference signal RS Reference (Reference (Signal) transmitted from the base station for each cell is detected, and the received power is measured.
- the reference signal RS uses a code corresponding to PCI one-to-one, and can be separated from other cells by correlating with the code. By deriving the RS code of the cell from the PCI specified in ST1201, it becomes possible to detect the RS and measure the RS received power.
- a cell having the best RS reception quality (for example, a cell having the highest RS reception power, that is, the best cell) is selected from one or more cells detected up to ST1202.
- PBCH of the best cell is received, and BCCH which is broadcast information is obtained.
- MIB Master Information Block
- the MIB information includes, for example, DL (downlink) system bandwidth (also called transmission bandwidth setting (transmission bandwidth configuration: dl-bandwidth)), the number of transmission antennas, SFN (System frame number), and the like.
- SIB1 System Information Block 1 in the broadcast information BCCH is obtained.
- SIB1 includes information related to access to the cell, information related to cell selection, and scheduling information of other SIBs (SIBk; k ⁇ 2).
- SIB1 includes TAC (Tracking Area Code).
- the mobile terminal compares the TAC received in ST1205 with the TAC already held by the mobile terminal. If the result of the comparison is the same, a standby operation is started in the cell.
- the mobile terminal requests a change of TA to perform TAU (TrackingTrackArea Update) to the core network (Core Network, EPC) (including MME) through the cell.
- the core network updates the TA based on the identification number (UE-ID or the like) of the mobile terminal sent from the mobile terminal together with the TAU request signal.
- the core network transmits a TAU acceptance signal to the mobile terminal.
- the mobile terminal rewrites (updates) the TAC (or TAC list) held by the mobile terminal with the TAC of the cell. Thereafter, the mobile terminal enters a standby operation in the cell.
- CSG Cell Subscriber Group
- access is permitted only to one or a plurality of mobile terminals registered in the CSG cell.
- One or a plurality of mobile terminals registered with the CSG cell constitute one CSG.
- a CSG configured in this way is given a unique identification number called CSG-ID.
- a single CSG may have a plurality of CSG cells. If a mobile terminal registers in one of the CSG cells, it can access other CSG cells to which the CSG cell belongs.
- Home-eNB in LTE and Home-NB in UMTS may be used as a CSG cell.
- the mobile terminal registered in the CSG cell has a white list.
- the white list is stored in the SIM / USIM.
- the white list carries CSG information of the CSG cell registered by the mobile terminal.
- CSG-ID, TAI (Tracking Area Identity), TAC, etc. can be considered as the CSG information. If CSG-ID and TAC are associated with each other, either one is sufficient.
- GCI may be used as long as CSG-ID and TAC are associated with GCI (Global Cell Identity).
- a mobile terminal that does not have a white list (including a case where the white list is empty in the present invention) cannot access a CSG cell, and only accesses a non-CSG cell. Can not.
- a mobile terminal having a white list can access both a CSG cell of a registered CSG-ID and a non-CSG cell.
- PCI split Physical Cell Identity
- PCI split information is reported from the base station to the mobile terminals being served by the system information.
- a basic operation of a mobile terminal using PCI split is disclosed.
- a mobile terminal that does not have PCI split information needs to perform a cell search using all PCIs (for example, using all 504 codes).
- a mobile terminal having PCI split information can perform a cell search using the PCI split information.
- 3GPP allows temporary CSG members. Temporary members are also called temporary members, or visitors. Temporary members can set the period for which they are recognized as CSG members (Non-Patent Document 6).
- a mobile terminal selects or reselects a CSG cell.
- the first is an automatic mode.
- Selection or reselection is performed using an allowed CSG list (Allowed CSG ID List) in the mobile terminal.
- the camp-on is performed on one cell in the selected PLMN only when it is a non-CSG cell or a CSG cell with a CSG ID existing in the allowed CSG list. If the allowed CSG list of the mobile terminal is empty, the mobile terminal stops the autonomous search function of the CSG cell (Non-Patent Document 3, Chapter 5.4.2.8.1).
- the second is Manual mode.
- the features of the manual mode are shown below.
- the mobile terminal presents the user with a list of CSGs that are available on the currently selected PLMN.
- the list of CSG provided to the user by the mobile terminal is not limited to the CSG included in the allowed CSG list stored in the mobile terminal.
- the mobile terminal After the user selects based on the list of the CSG, the mobile terminal camps on the cell with the selected CSG ID and tries to register (Non-Patent Document 3, Chapter 5.4.2.8.1) ).
- Non-Patent Document 7 proposed in 3GPP describes a method for making a CSG member preferentially accessible in a hybrid cell, cell reselection to a hybrid cell, or from a hybrid cell to another cell, or from another cell to a hybrid cell.
- a technique is disclosed in which a CSG member UE is given priority during cell reselection to a cell so that the hybrid cell stays longer than a non-CSG member UE. If the hybrid cell is allowed to stay longer than a UE that is a non-CSG member, the coverage in the closed access mode may be wider than the coverage in the open access mode.
- FIG. 13 shows a conceptual diagram when a CSG member UE stays longer than a non-CSG member UE in a hybrid cell.
- reference numeral 1301 denotes a non-CSG cell, which is a macro cell (eNB) as an example here.
- Reference numeral 1302 denotes coverage by the non-CSG cell.
- Reference numeral 1303 denotes a hybrid cell (a HeNB in a hybrid access mode).
- Reference numeral 1304 denotes coverage accessible in both the open access mode and the closed access mode in the hybrid cell.
- Reference numeral 1305 (shaded portion) indicates coverage accessible only in the closed access mode in the hybrid cell.
- Reference numeral 1306 denotes a UE having the same CSG member as the CSG to which the hybrid cell belongs.
- the 1307 is a non-CSG member UE.
- the CSG member UE communicates with the non-CSG cell 1301 outside the coverage 1305 area, and the UE 1306 that has moved to the coverage 1305 area communicates with the hybrid cell 1303 by cell reselection.
- the UE 1307 that is a non-CSG member is still communicating with the non-CSG cell 1301 even in the area of the coverage 1305, and communicates with the hybrid cell 1303 by cell reselection only after moving to the coverage 1304.
- a UE of a CSG member stays longer than a UE of a non-CSG member, the coverage in the closed access mode may become wider than that in the open access mode. .
- FIG. 14 shows a conceptual diagram of interference that occurs in an area accessible only to CSG member UEs.
- FIG. 14A shows interference occurring in uplink communication
- FIG. 14B shows interference occurring in downlink communication.
- the description of the same reference numerals as in FIG. 13 is omitted.
- solid arrows indicate signals
- broken arrows indicate interference.
- FIG. 14 (a) will be described.
- the CSG member UE (1306) accesses the hybrid cell (1303), and the non-CSG member UE (1307) receives the macro cell (1301). ) Will be accessed.
- the following interference occurs in uplink communication.
- the uplink signal wave from the non-CSG member UE (1307) to the macro cell (1301) interferes with the uplink signal wave of the CSG member UE (1306) being served by the hybrid cell (1401).
- the uplink signal wave from the CSG member UE (1306) to the hybrid cell (1303) interferes with the uplink signal wave of the non-CSG member UE (1307) being served by the macro cell (1402).
- FIG. 14B will be described.
- the CSG member UE (1306) accesses the hybrid cell (1303), and the non-CSG member UE (1307) receives the macro cell (1301). ) Will be accessed.
- the following interference occurs in downlink communication.
- the downlink signal wave from the hybrid cell (1303) to the CSG member UE (1306) interferes with the downlink signal wave of the non-CSG member UE (1307) being served by the macro cell (1403).
- the downlink signal wave from the macro cell (1301) to the non-CSG member UE (1307) interferes with the downlink signal wave to the CSG member UE (1306) being served by the hybrid cell (1404).
- This embodiment discloses a method for solving the above problems.
- the coverage for UEs of non-CSG members and the coverage for UEs of CSG members are made the same.
- the communication area of the cell (base station) in the open access mode and the communication area of the cell (base station) in the closed access mode are made the same.
- the parameters that define the coverage used in the hybrid cell are the same for UEs of non-CSG members and UEs of CSG members.
- the same parameter value is applied to both UEs (CSG member UE and non-CSG member UE).
- Examples of the parameters related to coverage used in the hybrid cell include the maximum transmission power from the cell, the tilt angle of the cell antenna, or the maximum allowable transmission power of each UE being served by the cell.
- the maximum allowable transmission power of the UE is a parameter that can limit the uplink transmission power of the UE as shown in Non-Patent Document 10.
- FIG. 24 shows a conceptual diagram in a case where the coverage for UEs of non-CSG members is the same as the coverage for UEs of CSG members.
- reference numeral 2401 denotes a non-CSG cell, which is a macro cell (eNB) here.
- Reference numeral 2402 denotes coverage by the non-CSG cell.
- Reference numeral 2403 denotes a hybrid cell (HeNB in hybrid access mode).
- Reference numeral 2404 denotes coverage accessible in both the open access mode and the closed access mode in the hybrid cell.
- 2405 is a UE of the same CSG member as the CSG to which the hybrid cell belongs.
- 2406 is a UE of a non-CSG member.
- the macro cell (2401) is not a cell in the hybrid access mode like the hybrid cell but a cell only in the open access mode. For this reason, regardless of the UEs being served by the macro cell (2401), the coverage is one as the macro cell (2401) (2402). Here, similarly, in the hybrid cell (2403), the coverage is set to one as the hybrid cell (2403) regardless of the UE being served thereby (2404).
- both the CSG member UE (2405) and the non-CSG member UE (2406) communicate with the non-CSG cell (2401) outside the coverage (2404) of the hybrid cell (2403).
- both the UE (2405) of the CSG member and the UE (2406) of the non-CSG member communicate with the hybrid cell (2403). Therefore, as shown in FIGS. 14 (a) and 14 (b), it is possible to eliminate areas where the access destinations of CSG member UEs and non-CSG member UEs are different, and the uplink and / or Or, downlink interference can be eliminated.
- the parameter that defines the coverage used in the hybrid cell is the same between the UEs of the non-CSG member and the UE of the CSG member, or the same parameter value is applied to both UEs, so that the control process in the hybrid cell is performed. Can be simplified. In addition, since the same parameter value is applied to both UEs, different control by parameters is unnecessary, and the control process in the UE can be simplified. In addition, the number of parameters in the hybrid cell can be reduced, and the number of parameters that need to be notified to UEs being served thereby can be reduced, so that the amount of signaling can be reduced. Thereby, effects such as effective utilization of radio resources can be obtained.
- Embodiment 2 In the present embodiment, another method for solving the above problems is disclosed.
- the criteria of the reselection procedure, rules, cell ranking criteria, etc. are set to the non-CSG member UE and the CSG member UE. And the same.
- parameters for defining criteria used for cell reselection from a hybrid cell to another cell and cell reselection from another cell to a hybrid cell are the same for both UEs, or the same parameter value Apply.
- Serving cell reception quality threshold for initiating cell reselection as an example of parameters that define the criteria used for cell reselection from a hybrid cell to another cell and cell reselection from another cell to a hybrid cell
- Qoffset an offset value applied to the measurement result of the reception quality of the cell in the cell ranking criteria.
- FIG. 25 shows a conceptual diagram when the cell reselection criteria to / from the hybrid cell are the same for the UEs of non-CSG members and the UEs of CSG members. In the figure, the description of the same numbers as in FIG. 24 is omitted.
- the cell reselection criteria from the hybrid cell (2403) the same for the non-CSG member UE (2406) and the CSG member UE (2405), if the non-CSG member of the hybrid cell (2403) belongs to If the UE (2406) and the CSG member UE (2405) are in the same location, and if the other radio wave environment is the same, both UEs will reselect cells to the macro cell (2401) at the same point. .
- both the CSG member UE (2405) and the non-CSG member UE (2406) communicate with the non-CSG cell (2401) outside the coverage (2404) of the hybrid cell (2403).
- both the UE (2405) of the CSG member and the UE (2406) of the non-CSG member communicate with the hybrid cell (2403). Therefore, as shown in FIGS. 14 (a) and 14 (b), it is possible to eliminate areas where the access destinations of CSG member UEs and non-CSG member UEs are different, and the uplink and / or Or, downlink interference can be eliminated.
- the control process in the cell is performed by making the reselection procedure, rule, cell ranking criteria, and the like the same for the non-CSG member UE and the CSG member UE. Can be simplified.
- the same parameter value is applied to both UEs, different control by parameters is unnecessary, and the control process in the UE can be simplified.
- the number of parameters used in the cell can be reduced, and the number of parameters that need to be notified to UEs being served thereby can be reduced, so that the amount of signaling can be reduced. Thereby, effects such as effective utilization of radio resources can be obtained.
- Embodiment 3 In the present embodiment, another method for solving the above problems is disclosed.
- the case of cell reselection to / from a hybrid cell has been disclosed. That is, for the UE in the RRC_Idle (idle) state, it is possible to eliminate areas where the access destinations of the CSG member UE and the non-CSG member UE are different, and eliminate the uplink and / or downlink interference that occurs in the area. be able to.
- an area in which the access destinations of the CSG member UE and the non-CSG member UE are different from each other in the RRC connected state (RRC_connected) can be eliminated, and uplink and / or generated in the area.
- RRC_connected RRC connected state
- the criteria of the HO procedures, rules, criteria, etc. are set to non-CSG member UE and CSG. Same for member UEs.
- the parameters defining the HO criteria to / from the hybrid cell are made the same for both UEs, or the same parameter values are applied.
- a parameter that defines the HO standard to / from the hybrid cell there is a parameter that serves as a determination index for determining whether or not to generate an event in the measurement report.
- Event occurrence thresholds (Thresh, Thresh1, Thresh2), serving cell offset value (Ocs) applied to the reception quality measurement result, serving cell frequency offset value (Ofs) applied to the reception quality measurement result, Neighbor cell offset value (Ocn) applied to reception quality measurement results, neighboring cell frequency offset value (Ofn), event-specific offset value (Off), event applied to reception quality measurement results
- hysteresis Hys
- the control process in the cell can be simplified by making the HO procedure, rules, criteria, and the like the same for the non-CSG member UE and the CSG member UE.
- the same parameter value is applied to both UEs, different control by parameters is unnecessary, and the control process in the UE can be simplified.
- the number of parameters used in the cell can be reduced, and the number of parameters that need to be notified to UEs being served thereby can be reduced, so that the amount of signaling can be reduced. Thereby, effects such as effective utilization of radio resources can be obtained.
- Embodiment 1 to Embodiment 3 may be applied in combination. This allows the UE to be a CSG member and / or a non-CSG member in both the RRC-Idle state and the RRC connected state and in the operation when transitioning between the RRC-Idle state and the RRC connected state. The area where the UE cannot communicate can be eliminated.
- Embodiment 4 In 3GPP as another method for making a CSG member preferentially accessible in a hybrid cell, it is proposed to redirect a non-CSG member UE to another cell when the hybrid cell is in a congestion state.
- Non-Patent Document 8 describes that a non-CSG member UE already in an RRC connected state (RRC_Connected) is redirected to another cell in a congested hybrid cell.
- This embodiment discloses a method for solving this problem.
- a new RRC connection request (RRC Connection Request) is sent from the CSG member UE.
- RRC Connection Request A procedure for redirecting a UE of a non-CSG member to another cell is triggered using this connection request as a trigger.
- the non-CSG member UE is handed over (HO) to another cell.
- FIG. 15 shows an operation example of a normal HO procedure (Non-Patent Document 1). This is an example of the HO procedure discussed in 3GPP. Here, a case where communication between the source cell and the target cell is performed using the X2 interface is shown.
- the source cell notifies the UE of a measurement control message, and causes the UE to perform the measurement.
- the UE notifies the measurement result to the source cell.
- the source cell determines a target cell using a measurement report from the UE. In this way, in normal HO, each cell determines whether or not the UE needs to be HO and which cell is to be HO based mainly on the reception quality measurement result of the UE. That is, the HO procedure is activated using a measurement report (ST1502) from the UE as a trigger.
- the source cell that has determined the target cell notifies the target cell of a HO request message in ST1504.
- the HO request message includes UE context (UE context) information, which is information related to the UE to be HOed.
- UE context UE context
- the target cell determines whether to allow HO to the UE in consideration of the state of the own cell and information on the UE. Here, the case where it permits is shown.
- the target cell notifies a permission message (Ack) for the HO request in ST1506.
- the source cell that has received the permission message notifies the UE of HO control information.
- the target cell is notified of the data necessary for continuing communication with the HO and the PDCP SN status information related to the data to the target cell.
- the UE that has received the HO control information in ST1507 detaches from the source cell in ST1508, and performs synchronization processing on the target cell in ST1510 based on the target cell information included in the HO control information.
- the target cell After establishing the synchronization process, the target cell notifies the UE of uplink resource allocation information and TA (timing advance) information which is transmission timing information in ST1511.
- the UE that has received the information notifies the target cell of an RRC connection reconfiguration completion message in ST1512. Thereby, data communication between the UE and the target cell is started.
- the target cell that has received ST1512 performs processing for completing HO with the source cell via the MME and serving GW (S-GW), which are host devices.
- S-GW serving GW
- the source cell releases resources used for control associated with information on the UE in ST1514.
- the HO preparation (preparation) step the UE detach process of ST1508, the SN status information transmission of the source cell of ST1509 to ST1512
- the process until reception of completion of RRC connection reconfiguration of the source cell is defined as a HO completion (compression) step.
- FIG. 16 shows an operation example when a hybrid cell in a congested state starts a redirect to another cell of a non-CSG member UE by using a new RRC connection request (RRC Connection Request) from the CSG member UE as a trigger.
- RRC Connection Request RRC Connection Request
- HO is used as a specific method of redirection.
- the description of the same step number as in FIG. 15 is omitted.
- the source cell is a hybrid cell.
- the access mode of the target cell is set to cell A regardless of the particular mode.
- a case where a non-CSG member is in an RRC connected state in a hybrid cell is shown (ST1612).
- the non-CSG member UE may perform services such as data communication with the core network side (MME, S-GW, etc.) via a hybrid cell.
- MME core network side
- S-GW core network side
- ST1601 a CSG member UE being served by a hybrid cell transmits an RRC connection request.
- ST1602 the hybrid cell in the congested state that has received the RRC connection request message determines a non-CSG member UE in the RRC connection state to be redirected in its own cell in ST1602.
- HO to another cell is assumed as redirection. As described above, normal HO is mainly triggered by the reception quality measurement result of the UE.
- HO is performed with the reception of a new RRC connection request (RRC Connection Request) from the CSG member UE in the hybrid cell in a congested state as a trigger. Also, after redirecting (handover) an open mode UE (mobile terminal) from a hybrid cell (base station) to another cell (base station), a closed mode UE (mobile terminal) and a hybrid cell (base station) Complete the connection with.
- RRC Connection Request RRC Connection Request
- the hybrid cell that has determined the non-CSG member UE to be HO in ST1602 starts the process of HOing the non-CSG member UE to another cell.
- the non-CSG member UE is notified of the measurement control message, and in ST1502, the UE notifies the measurement result to the hybrid cell.
- the hybrid cell that has determined the target cell in ST1503 transmits a HO request message to the target cell via the MME in ST1605 and ST1606, unlike the procedure shown in FIG.
- FIG. 7 in the current HeNB architecture in 3GPP, there is no X2 interface between cells, and HeNBs are connected by an S1 interface via MME, HeNBGW, or S-GW.
- the HO request message includes information regarding the UE to be HOed.
- the target cell determines whether to allow HO to the UE in consideration of the state of the own cell and information on the UE. Here, the case where it permits is shown.
- the target cell notifies a permission message for the HO request via MME or the like in ST1607 and ST1608. Since this also has no X2 interface, it may be performed through MME or the like.
- the source cell that has received the permission message notifies the UE of HO control information.
- the target cell is notified of the data necessary for continuing communication with HO and the PDCP SN status information related to the target cell.
- the data may be notified via the S-GW, not via the MME or HeNBGW. Then, similarly to FIG. 15, ST1508 to ST1514 are performed.
- the hybrid cell Upon completion of HO in ST1514, the hybrid cell notifies an RRC connection setup message to the CSG member UE that requested the RRC connection in ST1603.
- the CSG member UE that has received the setup message performs setup, and notifies an RRC connection setup completion message to the hybrid cell in ST1604.
- the CSG member UE can perform services such as data communication with the core network side (such as MME) via the hybrid cell.
- the non-CSG member UE notifies the target cell of an RRC connection reconfiguration completion message in ST1512, and data communication between the UE and the target cell is started. As a result, the non-CSG member can communicate with the target cell while maintaining the RRC connection state.
- the UE notifies the hybrid cell of the measurement result in ST1502, and based on the information, the hybrid cell determines the target cell in ST1503.
- ST1501 and ST1502 may not be performed after determining the non-CSG member UE to be HO in ST1602.
- ST1503 is performed. If the hybrid cell recognizes a cell existing in the vicinity, the target cell may be determined based on the recognized cell.
- a method for recognizing a cell in which the hybrid cell exists in the vicinity there are a method in which the HeNB performs reception quality measurement from the neighboring cell and uses the result, or a method in which a measurement result from another UE being served by the hybrid cell is used.
- the time until redirect (HO) can be shortened. Therefore, the time until the CSG member UE can receive the service as the CSG member in the hybrid cell, or the non-CSG member It is possible to shorten the time until communication can be performed in another cell.
- the RRC connection completion procedure of the CSG member UE is performed.
- the redirection (HO) of the non-CSG member UE and the CSG member UE The RRC connection procedure may be performed in parallel. By doing so, even if the redirection (HO) of the UE of the non-CSG member fails, the RRC connection procedure to the hybrid cell of the CSG member UE can be completed, so that the access of the CSG member UE can be prioritized.
- the CSG member UE establishes an RRC connection in the hybrid cell by making the trigger for causing the non-CSG member UE to redirect the non-CSG member UE as a trigger for the RRC connection request from the UE of the CSG member. It becomes possible to transmit / receive data to / from the network side, and to receive service as a CSG member in the hybrid cell.
- the hybrid cell in a congested state is also short of resources for the RRC connection.
- the non-CSG member UE can be redirected, and the CSG member can be RRC connected.
- Embodiment 4 First Modification As another specific method of redirecting a non-CSG member UE that has already been in the RRC connected state (RRC_Connected) to another cell, a new hybrid cell from a CSG member UE is newly used in a congested hybrid cell. When the RRC connection request is made and the hybrid cell receives the completion of RRC connection, a procedure for redirecting the UE of the non-CSG member to another cell is triggered by the completion of RRC connection.
- FIG. 17 shows a method for starting redirection to a non-CSG member UE to another cell by using an RRC connection setup completion message (RRC Connection Setup Complete) as a trigger, as RRC connection completion.
- RRC connection setup completion message RRC Connection Setup Complete
- HO is used as a specific method of redirection.
- ST1611 is the same as the series of processing of ST1611 shown in FIG.
- the non-CSG member UE may perform services such as data communication with the core network side (MME or the like) via a hybrid cell.
- MME core network side
- ST1701 a CSG member UE being served by a hybrid cell transmits an RRC connection request.
- ST1702 the hybrid cell notifies an RRC connection setup message to the CSG member UE that has requested the RRC connection.
- the CSG member UE that has received the setup message performs setup, and notifies an RRC connection setup completion message to the hybrid cell in ST1703.
- the hybrid cell in the congested state that has received the RRC connection setup completion message determines a non-CSG member UE in the RRC connected state to be redirected in ST1704.
- HO to another cell is assumed as redirection.
- HO is triggered by reception of a new RRC connection setup complete (RRC Connection setup complete) message from the CSG member UE in the hybrid cell in the congested state.
- RRC Connection setup complete RRC Connection setup complete
- the CSG member UE since the CSG member UE is in the RRC connection state, it is ready to perform data communication with the core network at any time. Therefore, for example, when a non-CSG member UE in another RRC connection state under the hybrid cell terminates communication or transitions to the RRC_Idle state, the non-CSG member UE that is a target to be redirected (HO) Even if the HO has not yet completed HO, the CSG member can communicate with the core network via the hybrid cell, and can receive service as a CSG member.
- HO is used as a specific method of redirection. Not only HO but also release of RRC connection from hybrid cell, or camp-on to another cell after release of RRC connection from hybrid cell.
- cell selection or cell reselection may be performed. At this time, selection to the hybrid cell whose RRC connection has been released is prohibited.
- a timer may be provided with the prohibited time as a fixed time. By doing so, it is possible to prevent the hybrid cell from being permanently selected and re-selected. With this method, the RRC connection state of the non-CSG member UE cannot be continued, but the RRC connection can be established again in another cell.
- Embodiment 5 in Non-Patent Document 8 when a hybrid cell is in a congestion state, the CSG-indicator, which is broadcast information of the cell, is changed (FALSE ⁇ TRUE) when a non-CSG member UE is redirected to another cell.
- FALSE ⁇ TRUE FALSE ⁇ TRUE
- the CSG-indicator is included in SIB1, and TRUE is set for a CSG cell only in the closed access mode, and FALSE is set for a non-CSG cell only in the open access mode or a hybrid cell in the hybrid mode. Therefore, by changing the CSG-indicator of the hybrid cell (FALSE ⁇ TRUE), the hybrid cell is operated as a CSG cell only in the closed access mode, and non-CSG member UEs cannot access the hybrid cell. .
- FIG. 18 shows the operation of the UE when HO fails in the 3GPP standard (Non-Patent Document 9). If the UE detects a HO failure in ST1801, in ST1802, the UE returns to the setting of the source cell and starts a re-establishment procedure of the RRC connection. In the RRC connection re-establishment procedure, the UE starts T311 (ST1803). T311 is a time allowed for the re-establishment procedure of the RRC connection, and is a timer for the time. Since the UE returns to the setting of the source cell in ST1802, the UE selects the source cell as a suitable cell. If a suitable cell is selected, the mobile terminal immediately moves to ST1804 (A).
- T311 is a time allowed for the re-establishment procedure of the RRC connection, and is a timer for the time. Since the UE returns to the setting of the source cell in ST1802, the UE selects the source cell as a suitable cell.
- the UE stops timer T311, starts T301, and transmits an RRC connection re-establishment request to the source cell.
- T301 is a time allowed for the UE to receive an RRC connection re-establishment message from the source cell, and is a timer for the time.
- the UE moves to ST1806, determines that the RRC connection re-establishment has failed, and leaves the RRC connection state.
- the setting returns to the setting of the source cell.
- the source cell is a cell that has already been accessed and is therefore a suitable cell. That is, in the case of a normal HO failure, the procedure returns to the source cell, and a procedure is always performed when a suitable cell is selected (A).
- the hybrid cell is operated as a CSG cell only in the closed access mode, and the hybrid cell is already in a non-CSG in the RRC connection state.
- the CSG-indicator is TRUE, only UEs of the same CSG member can be handled as a suitable cell. Therefore, UEs that are non-CSG members are not suitable cells.
- the hybrid cell (the source cell) is not a suitable cell, so nothing can be done and the timer of the T311 It will wait for expiration (B).
- the UE moves to ST1806 due to expiration of the T311 timer in ST1807, fails to re-establish the RRC connection, and needs to leave the RRC connection state.
- RRC connection re-establishment is always impossible when HO fails.
- the CSG-indicator of the SIB1 of the hybrid cell in a congested state is changed (FALSE ⁇ TRUE) after the redirection of the non-CSG member UE is successful.
- the non-CSG member UE that has been HOed by the hybrid cell in a congested state can be obtained by executing a setting change that makes it impossible to switch back to the hybrid cell (base station) after successful handover. Even if HO fails for the target cell, it is possible to switch back to the source cell. Accordingly, in FIG. 18, the non-CSG member UE can execute ST1804 through the route of A. As a result, the UE can re-establish the RRC connection.
- the hybrid cell can execute HO again for the non-CSG member UE that has been switched back. Since the non-CSG member UE can switch back until the HO succeeds, it does not leave the RRC connection state.
- Whether or not the non-CSG member UE has successfully redirected may be determined by determining whether or not the HO has been completed in the hybrid cell when HO is used as a specific redirect method. If the HO is completed, the redirection is successful, and if the HO is not completed, the redirection is unsuccessful. Whether or not the HO has been completed may be determined by whether or not the resource release in ST1514 of FIG. 15 has been performed.
- the CSG member can preferentially receive preferential treatment such as high-speed service and charging setting in the hybrid cell, and the UE of the non-CSG member also continues to communicate by HOing to another cell while continuing the RRC connection state. The effect that it becomes possible is acquired.
- Embodiment 5 First Modification
- the CSG member UE cannot access the hybrid cell.
- the UE is regarded as a HO failure after a predetermined time elapses and the UE leaves the RRC connection state with the hybrid cell.
- the predetermined time may be measured using a timer. A timer from when the UE receives the first HO control information by redirection from the source cell until it succeeds in HO may be used.
- the setting of the predetermined time is performed by the source cell and notified to the UE.
- Three notification methods for the predetermined time are disclosed below.
- the cell notifies the UE by PBCH or PDSCH using BCCH as broadcast information.
- the cell notifies on the PBCH using the master information (MIB) or on the PDSCH using the system information (SIB). This can be notified to all mobile terminals being served, and is an excellent method in terms of effective use of radio resources.
- MIB master information
- SIB system information
- the UE In the second method, after a UE determines a UE to be HOed, the UE notifies the UE using a dedicated channel (DCCH). You may make it include in the measurement control message which a cell notifies with respect to this UE, or the mobility (HO) control information which a cell notifies with respect to this UE.
- the notification may be performed before the first HO execution step at the time of HO by redirection.
- the permissible time can be set for each UE, so that it can be set flexibly according to the radio wave status and capability of the UE to be HOed or whether or not it is a CSG member.
- the third method is a static value for the mobile communication system.
- a static value as a mobile communication system refers to a value known to a mobile terminal / base station as a mobile communication system, or a value described in a standard document.
- the method disclosed in Embodiment 11 can be applied.
- a predetermined time until the source cell flexibly succeeds in HO in consideration of the time until one HO failure of the non-CSG member UE and the allowable delay time of access to the hybrid cell of the CSG member UE.
- the new timer disclosed in the eleventh embodiment can be applied.
- Embodiment 6 When the hybrid cell is in a congestion state, when the CSG-indicator, which is the broadcast information of the cell, is changed (FALSE ⁇ TRUE) to redirect the non-CSG member UE to another cell, the non-CSG member UE When the HO fails, it is wasted time until the next operation can be performed away from the RRC connection state. In order to solve this problem, in this embodiment, it is not permitted to return to the setting of the source cell when HO fails. In other words, it does not switch back to the source cell when HO fails.
- the HO fails when the hybrid cell redirects (HO) a non-CSG member UE to another cell. Also do not allow returning to the setting in the source cell. By doing so, it is possible to prevent the UE of the non-CSG member that has failed in HO from returning to the setting of the source cell and performing the procedure for reestablishing the RRC connection. Therefore, unnecessary procedures are eliminated, and the effect that the control at the time of HO failure can be simplified is obtained.
- the procedure for leaving the RRC connection may be started immediately.
- FIG. 19 shows a specific example of the operation of the UE when HO fails disclosed in the present embodiment.
- the UE detects a HO failure in ST1801.
- ST1901 the UE determines whether or not the source cell is HO in a congested state. If it is not HO in the congested state, the process proceeds to ST1802 and a normal procedure for HO failure is executed.
- the UE disallows returning to the setting of the source cell and immediately moves to ST1806.
- the non-CSG member UE redirected (HO) from the hybrid cell in the congested state becomes Yes in ST1901, and immediately fails to re-establish the RRC connection in ST1806 and leaves the RRC connection.
- HO can leave the RRC connection and perform the cell selection procedure without waiting for the time allowed for the normal RRC connection re-establishment procedure (T311). Obviously, the non-CSG member UE can search for a cell that can be camp-on at an early time without delay.
- the procedure for cell reselection may be performed instead of the procedure for cell selection. Further, the non-CSG member UE can search for a cell that can be camped on in an early time without delay.
- the non-CSG member UE When performing cell selection or cell reselection in the procedure of cell selection or cell reselection after leaving the RRC connection, the non-CSG member UE does not select a source cell. This is because HO failure occurs while the broadcast information CSG-indicator of the hybrid cell that is the source cell is operating as TRUE. Since the source cell is no longer a suitable cell, it is impossible to camp on. Therefore, it is possible to immediately access another cell without selecting the congested hybrid cell that was the source cell.
- Embodiment 7 when the hybrid cell is in a congestion state, the CSG-indicator which is the broadcast information of the cell is changed (FALSE ⁇ TRUE) to redirect the non-CSG member UE to another cell.
- FALSE ⁇ TRUE the CSG-indicator which is the broadcast information of the cell
- a plurality of target cells for HO from the hybrid cell are set.
- a plurality of cells as target cells, when the non-CSG member UE fails to perform HO for the first target cell, HO is attempted for other target cells. By doing so, the problem that the RRC connection cannot be re-established at the time of HO failure can be solved.
- FIG. 20 shows a sequence example when a plurality of cells are set as target cells when the hybrid cell is congested. 20, description of the same step numbers as those in FIG. 17 is omitted.
- the source cell is a hybrid cell.
- the non-CSG member UE in the RRC connection state to be redirected (HO) by the source cell is determined.
- the source cell notifies the non-CSG member UE to be HO notified of a measurement control message
- ST2026 the UE notifies a measurement report to the source cell.
- the source cell determines a plurality of target cells in ST2001 based on the measurement report. As disclosed in Embodiment 4, ST2025 and ST2026 can be omitted.
- the source cell that has determined a plurality of target cells in ST2001 notifies each target cell of an HO request message for the plurality of target cells in ST2002, ST2003, and ST2004 via the MME (or HeNBGW).
- the HO request message notified from the source cell to the MME may include information on a plurality of target cells in one message as shown in ST2002, or may be a separate message for each target cell.
- the target cell A and the target cell B are used as a plurality of target cells.
- each target cell determines whether or not to allow HO based on the load status of the own cell, information on the UE included in the HO request message, and the like.
- HO request permission message notified from the MME to the source cell may include information on a plurality of target cells in one message as shown in ST2009, or may be a separate message for each target cell. good. By doing in this way, the source cell can obtain information on a plurality of target cells permitted for HO.
- the source cell determines the priority order for the UE to perform HO among the plurality of target cells permitted for HO.
- the source cell notifies the UE of HO control information.
- the HO control information includes not only information related to one target cell but also information related to a plurality of target cells. Further, priority order information of the plurality of target cells is included. The priority order may be included as numerical information. For example, in order from the highest, 1, 2, 3,... May be attached to each target cell information. Further, the target cell with the highest priority may be notified as the primary target cell, and the next as the secondary target cell. As another method, ST2011 may be notified to the UE a plurality of times.
- Information regarding one target cell may be included in one HO control information, and the UE may be notified of a plurality of target cells.
- the UE performs HO from a target cell having a high priority, and performs HO to a target cell having the next priority when HO fails.
- the HO request message is not notified to a plurality of target cells, but is notified to one target cell in the same manner as the normal HO procedure, and the HO has failed. In this case, the steps after the HO preparation step may be repeated.
- the UE that has received the HO control information from the source cell detaches from the source cell. Therefore, when the HO preparation step is performed on the new target cell when the HO fails, the HO control information of the new target cell must be notified again from the source cell to the UE. Since the UE is detached at this time, the source cell cannot notify the HO control information of the new target cell to the UE.
- the source cell that has determined the priority order of the UE to be HO among a plurality of target cells in ST2010 continues communication with the target cell (here, target cell A) having the highest priority in ST2013 and ST2014 via HO.
- Required data and PDCP SN status information related thereto are notified to the target cell.
- the data may be notified via the S-GW, not via the MME.
- the UE notified of the HO control information in ST2011 detaches from the source cell in ST2012, and starts synchronization processing for the target cell (target cell A) having the highest priority in ST2015.
- target cell A target cell having the highest priority
- ST2015 the case of HO failure is shown.
- the HO fails because the target cell cannot receive the synchronization process failure or the RRC connection reconfiguration completion message (ST2016).
- the source cell In the case of HO failure, the source cell must notify the next priority target cell (in this case, target cell B) of information necessary for continuing communication with HO. For this reason, the source cell must recognize that the target cell A and the UE have failed HO. Therefore, if a UE context release message does not come from the target cell A or MME for a certain period of time, it is determined that HO has failed. Transmission / reception of the UE context release message is a part of the process for HO completion. A timer for measuring a certain time may be provided. The timer may be stopped when the UE context release message is received.
- the source cell determines that HO has failed (ST2017), and in ST2018 and ST2019, data necessary for continuing communication with the target cell B of the next priority in HO and PDCP related thereto. Is notified to the target cell. Data may be notified via the S-GW instead of via the MME.
- a timer for normal HO (T304, see Non-Patent Document 9) may be used as the timer. Or you may make it derive
- the UE determines that HO has failed by the normal timer and starts synchronization processing to the next priority target cell by shortening the timer value for the normal HO by a certain time. It is preferable that information necessary for HO can be notified from the source cell to the target cell having the next priority.
- the UE that has determined that HO has failed for the target cell A in ST2016 in accordance with the information on the plurality of target cells included in the HO control information received from the source cell in ST2011, Here, synchronization processing is started for the target cell B).
- the UE may perform HO again when HO fails and perform synchronization processing (ST2015) therefor. Further, HO may be performed again for cells within the range of the received target cells when HO fails. If the priority order is received in ST2011, HO may be performed according to the priority order.
- the target cell B After the UE establishes synchronization processing for the target cell B, the target cell B notifies the UE of uplink resource allocation information and TA (timing advance) information which is transmission timing information in ST2021. The UE that has received the information notifies the target cell B of an RRC connection reconfiguration completion message in ST2022. As a result, data communication between the UE and the target cell B is started. In ST2023, the target cell B that has received ST2022 performs processing for completing HO with the source cell via the MME and S-GW, which are host devices. Along with the processing for completing HO in ST2023, the source cell releases resources used for control associated with information on the UE in ST2024.
- TA timing advance
- the CSG member can preferentially receive preferential treatment such as high-speed service and the following settings in the hybrid cell, and the UE of the non-CSG member also continues to communicate by HOing to another cell while continuing the RRC connection state. The effect that it becomes possible is acquired.
- the method disclosed in the sixth embodiment may be applied. If the source cell fails due to HO due to the congested state, it does not return to the setting of the source cell, but immediately leaves the RRC connected state. By doing so, even if a non-CSG member UE fails in HO for all target cells, the UE can search for a camp-on capable cell at an early time without delay.
- the maximum number of target cells is allowed when allowing the target cell for HO from the hybrid cell to be a plurality of cells. May be provided.
- a maximum value may be provided in determining a plurality of target cells in ST2001, or a maximum value may be provided in determining priority of target cells in ST2010.
- the maximum value of the target cell which performs this HO may be provided, and UE may perform HO to the target cell within this maximum value.
- the maximum value may be determined in advance, or when the UE uses, the UE may be notified from the source cell or the core network side (MME, HeNBGW) via the source cell.
- broadcast information may be broadcasted to UEs being served by the source cell or may be individually notified to UEs. When notifying UE separately, you may make it notify by including in HO control information.
- Embodiment 8 in the seventh embodiment, when performing the HO preparation step for a plurality of target cells, a method for making a HO request to a plurality of target cells in parallel is disclosed as an example. In this embodiment, as another method, a method of serially making a HO request to a plurality of target cells is disclosed.
- FIG. 21 shows a sequence example when a HO request is serially made to a plurality of target cells.
- FIG. 20 which is a sequence of the entire HO, the processes from ST2001 to ST2010 which are different operations are newly shown.
- the source cell is a hybrid cell.
- the i-th target cell is indicated by target cell #i.
- the source cell determines a plurality of target cells.
- the source cell prioritizes the target cell determined in ST2102.
- the source cell makes a HO request to the target cell with the i-th priority.
- the HO request is notified to the target cell #i via the MME.
- the target cell #i determines whether or not to permit HO for the UE (ST2108), and notifies the source cell of a HO request permission / denial message via the MME in ST2109 and ST2110.
- the source cell that has received the HO request permission / non-permission message determines whether it has notified the HO request to all the target cells determined in ST2101. If not notified, the process returns to ST2104, and the process up to ST2110 is repeated for the next priority target cell.
- the mobile terminal moves to ST2112 and again determines the priority order for the target cell that has received the HO request permission message.
- the source cell only needs to signal the HO request message as necessary. Therefore, since the amount of signaling performed in parallel can be reduced, signal congestion at the interface between the cell, MME, and HeNBGW can be reduced, and signaling transmission / reception errors can be reduced. In the source cell, erroneous reception of the HO request permission / non-permission message can be reduced.
- FIG. 22 shows a sequence example when the desired number of target cells is set. In FIG. 22, the description of the same numbers as those in FIG. 21 is omitted.
- the source cell counts the number of target cells that have received the HO request permission message, and determines whether or not the desired number of target cells has been satisfied. If not, the process returns to ST2104 and repeats the HO request to the next priority target cell. If the desired number of target cells is satisfied in ST2201, the process proceeds to ST2112.
- the source cell needs to signal the HO request message only to the minimum required number of target cells. It is possible to eliminate useless signaling and to stabilize the operation as a system.
- the target cell that has received the HO request permission message within a certain time interval may be set as the target cell.
- a timer for measuring a certain time interval may be provided.
- the target cell that has received the HO request permission message within the time interval is set as the target cell, and the priority order of the target cell notified to the UE in ST2112 is determined again.
- i 0 is set in ST2103, and a timer for measuring the time interval is started, and the processing of ST2201 is determined based on whether or not the timer has expired. If it has not expired, the process returns to ST2104. If it has expired, the process proceeds to ST2112.
- the method disclosed in the first modification of the eighth embodiment is also applicable to the case where the HO request is made in parallel to a plurality of target cells disclosed in the seventh embodiment.
- Embodiment 9 In the seventh and eighth embodiments, at least while the CSG-indicator that is broadcast information of the hybrid cell is operating as TRUE, it is permitted to set a plurality of target cells for HO from the hybrid cell. .
- a method has been disclosed in which the HO preparation step is performed on a plurality of target cells, and the HO execution step and subsequent steps are repeatedly performed when the HO fails.
- the data necessary for continuing communication with the target cell by HO in the HO preparation step and the HO execution step and the PDCP SN status information related thereto are targeted.
- Disclosed is a method for performing a plurality of target cells until the notification to a cell is performed, and repeatedly performing the subsequent steps.
- FIG. 23 shows a sequence example in the case where data necessary for continuing communication and notification of PDCP SN status information related thereto are performed for a plurality of target cells.
- the source cell is a hybrid cell. 23, the description of the same numbers as those in FIG. 20 is omitted. It is the same as FIG. 20 until the source cell determines the priority order of the plurality of target cells in ST2010 of FIG. 23 and notifies the HO control information to the non-CSG member UE in ST2011.
- the source cell notifies the plurality of target cells of data necessary for continuing communication by HO and PDCP SN status information related thereto. Data may be notified via the S-GW, not via the MME.
- the plurality of target cells may be the same as the plurality of target cells included in the HO control information notified to the UE in ST2011.
- the target cell A and the target cell B are used.
- the data required for continuing communication with the HO notified from the source cell to the S-GW may include information on a plurality of target cells in one message. Each message may be a separate message.
- information on multiple target cells is also included in one message for PDCP SN status information related to data required to continue communication with HO notified from the source cell to the MME or HeNBGW. Alternatively, it may be a separate message for each target cell.
- the UE may determine the priority order of the target cells. Even if the UE selects the next target cell when the HO has failed, the target candidate cell already has information necessary for HO, so that the UE can perform HO.
- the source cell notifies information on a plurality of target cells in ST2011, but it is not necessary to notify the priority order information. Therefore, the amount of information can be reduced. Further, the processing of ST2017 shown in FIG. Since the source cell has already notified all the target cells of information necessary for HO, when the UE fails in HO, it is not necessary to send information necessary for HO to the next priority cell. This eliminates the need for the source cell to recognize the HO failure between the UE and the target cell.
- the processing of ST2017 can be made unnecessary. By doing so, it becomes possible to simplify the HO process in the source cell.
- the UE determines the priority order of the target cells, it is possible to obtain an effect that the UE can select a target cell with a higher possibility of connection.
- the CSG member can preferentially receive preferential treatment such as high-speed service and the following settings in the hybrid cell, and the UE of the non-CSG member also continues to communicate by HOing to another cell while continuing the RRC connection state. The effect that it becomes possible is acquired.
- the HO destination is not limited to this, and a plurality of target cells are used. You may apply to the HO procedure in the case of. Thereby, the possibility of HO failure can be reduced.
- the source cell (the hybrid cell in the congested state) notifies the UE to be redirected that the redirect is from the congested hybrid cell.
- the notification is preferably performed before the HO execution step.
- the UE is notified using a dedicated channel (DCCH).
- DCCH dedicated channel
- the source cell or the UE can distinguish between measurement in normal HO and measurement in HO due to redirection from a congested hybrid cell. It is possible to vary the standard of the event, the threshold of the event, and the like.
- the source cell or the UE can distinguish between normal HO and HO by redirection from a congested hybrid cell. It can also be applied to cases where measurement control is omitted.
- 1-bit information may be used as a specific method for indicating that the redirect is from a congested hybrid cell. For example, “0” may be normal HO, and “1” may be HO by redirection from a congested hybrid cell.
- a UE that is redirected (HO) to a hybrid cell in a congested state may be a determination index as to whether or not to perform HO again when HO fails. For example, when the maximum number of target cells differs between normal HO and redirected HO, the number of target cells that can be retried HO is changed based on information indicating that the redirect is from the congested hybrid cell. Just do it.
- the UE By adopting the method disclosed in the present embodiment, it becomes possible for the UE to be redirected to explicitly receive the redirection from the hybrid cell in a congested state. Malfunctions are less likely to occur, such as adopting a method. Therefore, even when a method of redirecting to another cell in the hybrid cell is used as a system, the operation can be stabilized.
- Embodiment 11 In the present embodiment, a timer for measuring the allowable time for HO in which a plurality of target cells are set at the UE is newly provided separately from the timer for measuring the allowable time for a single HO in the conventional target cell. .
- a timer for normal HO (see T304, Non-Patent Document 9) transmits a RRC connection reconfiguration complete message to the target cell from when the UE receives HO control information from the source cell until it succeeds in HO. Time until.
- the timer is a timer for HO for one target cell. It becomes a timer for judging whether HO has failed for one target cell.
- the timer is used for each target cell HO. That is, when HO is possible for a plurality of target cells, it becomes impossible to set an allowable time for a series of HOs.
- the allowable time for a series of HOs determines the delay time until the service start of the UE trying to perform service in the source cell and the communication interruption time of the UE that is performing HO. Therefore, it is important in determining the operation of the system.
- a permissible time (timer) for HO at the UE is newly provided separately from a permissible time (timer) for conventional HO.
- a permissible time (timer) from when the UE receives HO control information from the source cell to when a series of HOs succeeds is provided.
- the UE fails to perform HO and repeatedly performs HO on a plurality of target cells, if the RRC connection reconfiguration complete message can be transmitted to any of the target cells within the timer, it is determined that a series of HOs have succeeded. However, if the RRC connection reconfiguration complete message cannot be transmitted to any target cell within the allowable time, it is regarded as a series of HO failures and the HO failure process is performed. As a HO failure process, it can be used to determine whether or not the source cell performed by the UE disclosed in Embodiment 6 is a HO due to a congestion state (ST1901 in FIG. 19).
- the allowable time for a series of HOs can be limited, it is possible to limit the delay time until the service start of the UE trying to perform service in the source cell and the communication interruption time of the UE that is performing HO. It becomes.
- the allowable time for a series of HOs disclosed in this embodiment and the conventional allowable HO time may be used together.
- the conventional HO allowable time is set as the allowable time for HO of each target cell, and the allowable time for a series of HOs is used for a series of HOs. It ’s fine.
- the UE can recognize the HO failure to the target cell and perform HO to the target cell of the next priority.
- the permissible time for conventional HO may be the permissible time for a series of HOs, and the permissible time for newly provided HO may be the permissible time for HO for each target cell. In any case, the above effect can be obtained.
- the cell notifies the UE by PBCH or PDSCH using BCCH as broadcast information.
- the cell notifies on the PBCH using the master information (MIB) or on the PDSCH using the system information (SIB). This can be notified to all mobile terminals being served, and is an excellent method in terms of effective use of radio resources.
- MIB master information
- SIB system information
- the UE In the second method, after a UE determines a UE to be HOed, the UE notifies the UE using a dedicated channel (DCCH). This notification is performed before the HO execution step. You may make it include in the measurement control message which a cell notifies with respect to this UE, or the mobility (HO) control information which a cell notifies with respect to this UE.
- the permissible time can be set for each UE, so that it can be set flexibly according to the radio wave status and capability of the UE to be HOed or whether or not it is a CSG member.
- the third method is a static value for the mobile communication system.
- a static value as a mobile communication system refers to a value known to a mobile terminal / base station as a mobile communication system, or a value described in a standard document.
- an allowable time for a series of HOs is conventionally set. Is an integer multiple of the allowable time for HO.
- Ttotal Tsingle ⁇ n (n is a positive integer) where Ttotal is a timer for a series of HO and Tsingle is a timer for a conventional HO.
- the method for notifying the value of n can use the method described above. It is possible to reduce the amount of information because n is a positive integer rather than providing a new detailed allowable time.
- n may be the maximum value of the target cell. For the maximum value of the target cell, the method disclosed in the seventh embodiment can be applied. When the maximum value of the target cell is notified from the source cell to the UE, the value of n need not be notified. The amount of information can be further reduced.
- the conventional HO allowable time is used as the allowable time for each target cell, and the newly provided HO allowable time is used as the allowable time for a series of HOs.
- the present invention is not limited to this, and the allowable time for the conventional HO may be set as the allowable time for a series of HOs, and the allowable time for the newly provided HO may be set as the allowable time for each target cell. In any case, the above-described effects can be obtained.
- the present embodiment is not limited to the case where the target cell at the time of HO from the hybrid cell when the hybrid cell is in a congestion state is a plurality of cells, but the target cell is a plurality of cells at the time of HO. This is generally applicable.
- the method disclosed in the fourth to eleventh embodiments may be applied to the HO by performing cell- or network-driven HO at the time of UE CSG deregistration.
- the cell belonging to the CSG is not a suitable cell.
- the source cell is a suitable cell It becomes possible to solve the problem that occurs because it is not.
- the CSG registration period of the temporary (temporary) member UE of the CSG expires, cell- or network-driven HO is performed, and the method disclosed in the fourth to eleventh embodiments is applied to the HO. It may be applied.
- the temporary member UE expires in the CSG registration period, it is possible to solve the same problem as described above that occurs because the cell belonging to the CSG is not a suitable cell.
- the method disclosed in the fourth to eleventh embodiments may be applied to the HO by performing cell- or network-driven HO.
- the cell (HeNB) becomes inaccessible, and thus the same problem as described above can be solved.
- the present invention does not specifically refer to the frequency carrier of the system, cell reselection, cell selection, handover within the same frequency carrier (intra-frequency) may be performed, and other frequency carriers (inter -frequency) cell reselection, cell selection, and handover.
- the present invention can be applied to a case where the CSG cell is operated on a dedicated frequency carrier different from that of the non-CSG cell.
- the hybrid cell in the system can be flexibly arranged and a wide variety of services can be provided.
- a CSG member belonging to the same CSG accessed in the closed access mode can be used rather than a non-CSG member accessed in the open access mode. It becomes possible to give preferential treatment to services and billing settings as being preferentially accessible.
- the present invention has been described centering on the LTE system (E-UTRAN), it is applicable to the W-CDMA system (UTRAN, UMTS) and LTE-Advanced (LTE-Advanced). Furthermore, a mobile communication system in which CSG (Closed Subscriber Group) is introduced, a communication system in which an operator identifies a subscriber and access is permitted to the identified subscriber, as in CSG, and HeNB Similarly, the present invention can be applied to a communication system in which a cell having a smaller cell radius than a normal cell is introduced.
- CSG Cell Subscriber Group
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Abstract
Description
CSG-IDはCSGセルかセルによって報知される。移動体通信システムにCSG-IDは複数存在する。そして、CSG-IDは、CSG関連のメンバーのアクセスを容易にするために移動端末(UE)によって使用される。移動端末の位置追跡は、1つ以上のセルからなる区域を単位に行われる。位置追跡は、待受け状態であっても移動端末の位置を追跡し、呼び出す(移動端末が着呼する)ことを可能にするためである。この移動端末の位置追跡のための区域をトラッキングエリアとよぶ。CSGホワイトリスト(CSG White List)とは、加入者が属するCSGセルのすべてのCSG IDが記録されている、USIMに格納されたリストである。CSGホワイトリストは、許可CSGリスト(Allowed CSG ID List)と呼ばれることもある。
また、別の方法として、ハイブリッドセルが混雑(congestion)状態の場合に、非CSGメンバーのUEを他セルへリダイレクトさせることが提案されている(非特許文献8)。
前記オープンモードにおける基地局の通信エリアと前記クローズドモードにおける基地局の通信エリアとが同一であることを特徴とする移動体通信システムである。
図7は、現在3GPPにおいて議論されているLTE方式の移動体通信システムの全体的な構成を示すブロック図である。現在3GPPにおいては、CSG(Closed Subscriber Group)セル(e-UTRANのHome-eNodeB(Home-eNB,HeNB),UTRANのHome-NB(HNB))とnon-CSGセル(e-UTRANのeNodeB(eNB)、UTRANのNodeB(NB)、GERANのBSS)とを含めたシステムの全体的な構成が検討されており、e-UTRANについては、図7のような構成が提案されている(非特許文献1 4.6.1.章)。
本実施の形態では上記の問題点を解消するための別の方法を開示する。ハイブリッドセルから別のセルへのセル再選択および別のセルからハイブリッドセルへのセル再選択において、該再選択の手順、ルール、セルランキングクライテリアなどの基準を非CSGメンバーのUEとCSGメンバーのUEとで同じにする。具体的な方法として、ハイブリッドセルから別のセルへのセル再選択および別のセルからハイブリッドセルへのセル再選択に用いる基準を規定するパラメータを両UEに対して同じにする、あるいは同じパラメータ値を適用する。ハイブリッドセルから別のセルへのセル再選択および別のセルからハイブリッドセルへのセル再選択に用いる基準を規定するパラメータ例として、セル再選択を開始するためのサービングセルの受信品質閾値(Sintrasearch、Sintersearch)、セルランキングのクライテリアでセルの受信品質の測定結果に対して適用するオフセット値(Qoffset)などがある。
本実施の形態では上記の問題点を解消するための別の方法を開示する。実施の形態2においては、ハイブリッドセルへ/からのセル再選択の場合について開示した。すなわち、RRC_Idle(アイドル)状態のUEに対して、CSGメンバーのUEと、非CSGメンバーのUEとのアクセス先が異なるエリアを無くすことができ、該エリアで生じる上りかつ/または下りの干渉を無くすことができる。
3GPPにおいて、ハイブリッドセルにおいてCSGメンバーを優先的にアクセス可能とさせるための別の方法として、ハイブリッドセルが混雑(congestion)状態の場合に、非CSGメンバーのUEを他セルにリダイレクトさせることが提案されている(非特許文献8)ことを述べた。また、非特許文献8には、混雑状態のハイブリッドセルにおいて、既にRRC接続状態(RRC_Connected)の非CSGメンバーのUEを他のセルにリダイレクトさせることが記載されている。
既にRRC接続状態(RRC_Connected)の非CSGメンバーのUEを他のセルへリダイレクトする具体的な別の方法として、混雑状態のハイブリッドセルにおいて、CSGメンバーのUEから新たにRRC接続要求が行われ、RRC接続完了をハイブリッドセルが受信した場合に、このRRC接続完了をトリガとして、非CSGメンバーのUEを他のセルへリダイレクトさせる手順を起動する。
非特許文献8には、ハイブリッドセルが混雑(congestion)状態の場合に、非CSGメンバーのUEを他セルへリダイレクトさせる場合に、セルの報知情報であるCSG-indicatorを変更(FALSE→TRUE)する方法が記載されている。CSG-indicatorはSIB1に含まれており、クローズドアクセスモードのみのCSGセルの場合TRUEが設定され、オープンアクセスモードのみのnon-CSGセルあるいはハイブリッドモードのハイブリッドセルの場合FALSEが設定される。従って、ハイブリッドセルのCSG-indicatorを変更(FALSE→TRUE)することで、ハイブリッドセルをクローズドアクセスモードのみのCSGセルとして動作させ、非CSGメンバーのUEが該ハイブリッドセルにアクセスすることをできなくする。
しかし、ハイブリッドセルへの切り戻りが不可となるような設定の変更を、HOが成功後に変更するようにした場合、いつまでたってもHO成功しなかった場合は、いつまでたってもCSGメンバーUEが該ハイブリッドセルにアクセスできなくなってしまう。これを防ぐため、所定時間が経過した後にHO失敗とみなし、UEが該ハイブリッドセルとのRRC接続状態から離れるようにしておくと良い。所定時間はタイマーを用いて計時すれば良い。UEがソースセルからのリダイレクトによる最初のHO制御情報を受信してからHOを成功するまでのタイマーとすれば良い。
ハイブリッドセルが混雑(congestion)状態の場合に、セルの報知情報であるCSG-indicatorを変更(FALSE→TRUE)して非CSGメンバーのUEを他セルへリダイレクトさせる場合に、非CSGメンバーのUEがHO失敗時にRRC接続状態から離れて次の動作を行なうことができるようになるまで、無駄な時間を費やすことになってしまう。この問題を解消するため、本実施の形態では、HO失敗時にソースセルの設定に戻ることを許可しないようにする。言い換えると、HO失敗時にソースセルへ切り戻らないようにする。
本実施の形態では、ハイブリッドセルが混雑(congestion)状態の場合に、セルの報知情報であるCSG-indicatorを変更(FALSE→TRUE)して非CSGメンバーのUEを他セルへリダイレクトさせる場合に、非CSGメンバーのUEがHO失敗時に常にRRC接続再設立不可能となってしまう問題を解消するための別の方法を開示する。
実施の形態7では、HO準備ステップを複数のターゲットセルに対して行う際、一例として複数のターゲットセルに対して並行にHO要求を行う方法を開示した。本実施の形態では別の方法として、複数のターゲットセルに対してシリアルにHO要求を行う方法を開示する。
複数のターゲットセルに対してシリアルにHO要求を行う場合、所望のターゲットセル数を設定しておいても良い。
実施の形態7、8では、少なくともハイブリッドセルの報知情報であるCSG-indicatorがTRUEとして動作している間は、該ハイブリッドセルからのHOの際のターゲットセルを複数のセルとすることを許可した。具体的な動作例として、HO準備ステップを複数のターゲットセルに対して行い、HO失敗時にHO実行ステップ以降を繰返し行うようにする方法を開示した。
本実施の形態では、混雑状態のハイブリッドセルからのリダイレクトである旨を、ソースセル(該混雑状態のハイブリッドセル)がリダイレクト対象となるUEに対して通知する。該通知はHO実行ステップより前に行うのが望ましい。
本実施の形態では、ターゲットセルを複数設定したHOのための許容時間をUEにて計時するタイマーを、従来のターゲットセルが単数のHOのための許容時間を計時するタイマーとは別に新たに設ける。
なお、本実施の形態で開示した一連のHOに対する許容時間と、従来のHO許容時間をあわせて用いても良い。複数のターゲットセルに対してHOを可能とするような場合に、従来のHO許容時間をターゲットセル一つずつのHOに対する許容時間として、一連のHOについて一連のHOに対する許容時間を用いるようにすれば良い。ターゲットセルひとつずつのHOに対するタイマーを用いることでUEは該ターゲットセルへのHO失敗を認識でき、次の優先順位のターゲットセルへのHOを行うようにできる。
Claims (17)
- 1以上の移動端末および1以上の基地局からなるアクセスグループが登録された場合に、前記アクセスグループに含まれる基地局に対し同じアクセスグループに含まれる移動端末からのクローズドモードのアクセス、および同じアクセスグループに含まれない移動端末からのオープンモードのアクセスをハイブリッドに許可する移動体通信システムであって、
前記オープンモードにおける基地局の通信エリアと前記クローズドモードにおける基地局の通信エリアとが同一であることを特徴とする移動体通信システム。 - 前記通信エリアを規定するパラメータが前記オープンモードと前記クローズドモードとで同一であることを特徴とする請求項1記載の移動体通信システム。
- 前記クローズドモードのアクセスおよび前記オープンモードのアクセスをハイブリッドに許可するハイブリッド基地局から別の基地局への再選択または別の基地局から前記ハイブリッド基地局への再選択を実行する基準のうち、前記クローズドモードにおいて再選択を実行する基準と前記オープンモードにおいて再選択を実行する基準とが同一であることを特徴とする請求項1記載の移動体通信システム。
- 前記クローズドモードにおいて再選択を実行する基準を規定するパラメータと、前記オープンモードにおいて再選択を実行する基準を規定するパラメータとが同一であることを特徴とする請求項3記載の移動体通信システム。
- 前記クローズドモードのアクセスおよび前記オープンモードのアクセスをハイブリッドに許可するハイブリッド基地局から別の基地局へのハンドオーバまたは別の基地局から前記ハイブリッド基地局へのハンドオーバを実行する基準のうち、前記クローズドモードにおいてハンドオーバを実行する基準と前記オープンモードにおいて再選択を実行する基準とが同一であることを特徴とする請求項1記載の移動体通信システム。
- 前記クローズドモードにおいてハンドオーバを実行する基準を規定するパラメータと、前記オープンモードにおいてハンドオーバを実行する基準を規定するパラメータとが同一であることを特徴とする請求項5記載の移動体通信システム。
- 混雑状態のときにオープンモードの移動端末を前記ハイブリッド基地局から別の基地局にリダイレクトさせることを特徴とする請求項1記載の移動体通信システム。
- クローズドモードの移動端末から前記ハイブリッド基地局に接続が要求された場合、オープンモードの移動端末を前記ハイブリッド基地局から別の基地局にリダイレクトさせた後に、前記クローズドモードの移動端末と前記ハイブリッド基地局との接続を完了させることを特徴とする請求項7記載の移動体通信システム。
- クローズドモードの移動端末から前記ハイブリッド基地局に接続が要求された場合、前記クローズドモードの移動端末と前記ハイブリッド基地局との接続を完了させた後に、オープンモードの移動端末を前記ハイブリッド基地局から別の基地局にリダイレクトさせることを特徴とする請求項7記載の移動体通信システム。
- オープンモードの移動端末を前記ハイブリッド基地局から別の基地局にハンドオーバさせることによってリダイレクトさせる場合、
前記ハイブリッド基地局への切り戻りが不可となるような設定変更を、ハンドオーバが成功となった後に実行することを特徴とする請求項7記載の移動体通信システム。 - オープンモードの移動端末を前記ハイブリッド基地局から別の基地局にハンドオーバさせることによってリダイレクトさせる場合、
所定時間が経過したときに、前記オープンモードの移動端末と前記ハイブリッド基地局との接続を解除することを特徴とする請求項7記載の移動体通信システム。 - 前記ハイブリッド基地局から別の基地局へのリダイレクトに失敗した場合、前記ハイブリッド基地局への切り戻りを禁止することを特徴とする請求項7記載の移動体通信システム。
- 前記ハイブリッド基地局からリダイレクトさせるターゲットの基地局を複数設定することを特徴とすることを特徴とする請求項7記載の移動体通信システム。
- オープンモードの移動端末を前記ハイブリッド基地局から別の基地局にハンドオーバさせることによってリダイレクトさせる場合、
ハンドオーバ準備工程、ハンドオーバ実行工程およびハンドオーバ完遂工程からなるハンドオーバ全工程のうち、前記ハンドオーバ準備工程を複数の基地局に対して並行して行い、ハンドオーバ実行工程およびハンドオーバ完遂工程を複数の基地局に対して成功するまで順次行うことを特徴とする請求項13記載の移動体通信システム。 - 前記ハイブリッド基地局がオープンモードの移動端末を別の基地局にハンドオーバさせることによってリダイレクトさせる場合、
ハンドオーバ準備工程、ハンドオーバ実行工程およびハンドオーバ完遂工程からなるハンドオーバ全工程を複数の基地局に対して成功するまで順次行うことを特徴とする請求項13記載の移動体通信システム。 - 前記ハイブリッド基地局は、別の基地局にリダイレクトさせることをオープンモードの移動端末に通知することを特徴とする請求項7記載の移動体通信システム。
- オープンモードの移動端末を前記ハイブリッド基地局から別の基地局にハンドオーバさせることによってリダイレクトさせる場合、
複数のターゲット基地局に対する一連のハンドオーバの失敗を規定する時間を設定し、当該時間を経過したときにハンドオーバ失敗とすることを特徴とする請求項13記載の移動体通信システム。
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JP2016515338A (ja) * | 2013-03-04 | 2016-05-26 | アップル インコーポレイテッド | 再確立候補としてオーバーレイマクロセルを用いるHetNetロバスト性における再確立 |
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US20210013978A1 (en) * | 2018-01-12 | 2021-01-14 | Institut Für Rundfunktechnik | Transmitter and/or receiver for transmitting and/or receiving radio information signals |
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Also Published As
Publication number | Publication date |
---|---|
JPWO2011039960A1 (ja) | 2013-02-21 |
EP2472938A1 (en) | 2012-07-04 |
US20120196603A1 (en) | 2012-08-02 |
JP5583135B2 (ja) | 2014-09-03 |
CN102550068B (zh) | 2016-02-10 |
US20160073311A1 (en) | 2016-03-10 |
US9585070B2 (en) | 2017-02-28 |
JP5875639B2 (ja) | 2016-03-02 |
JP2014220829A (ja) | 2014-11-20 |
CN105451295A (zh) | 2016-03-30 |
EP2472938A4 (en) | 2016-03-09 |
CN102550068A (zh) | 2012-07-04 |
US9226221B2 (en) | 2015-12-29 |
CN105451295B (zh) | 2019-04-12 |
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