WO2010073630A1

WO2010073630A1 - Mobile body communication system

Info

Publication number: WO2010073630A1
Application number: PCT/JP2009/007133
Authority: WO
Inventors: 前田美保; 望月満; 三枝大我; 岩根靖
Original assignee: 三菱電機株式会社
Priority date: 2008-12-23
Filing date: 2009-12-22
Publication date: 2010-07-01
Also published as: JP2012044234A

Abstract

Disclosed is a mobile body communication system wherein a mobile terminal receives a physical cell identity that is allocated to a communication cell, the mobile body communication system including a cell intended for use by a specific participant, which allows use by a specific mobile terminal (CSG), and a cell intended for use by a non-specific user, which is usable by a non-specific mobile terminal (non-CSG), and selects a cell. The physical cell identity is classified into a first classification, which is allocated to the CSG cell, and a second classification, which is allocated to the non-CSG cell, wherein the physical cell identity that is included in the first classification is allocated to a CSG cell that operates in hybrid mode.

Description

Mobile communication system

The present invention relates to a mobile communication system in which a base station performs wireless communication with a plurality of mobile terminals.

Among the communication systems called third generation, the W-CDMA (Wideband Code Division Multiple Access) system has been commercialized in Japan since 2001. Also, by adding a packet transmission channel (HS-DSCH: High Speed-Downlink Shared Channel) to the downlink (individual data channel, individual control channel), data transmission using the downlink is further accelerated. Realized HSDPA (High Speed Down Link Link Packet Access) services have been started. Furthermore, in order to further increase the speed of data transmission in the uplink direction, a service has also been started for the HSUPA (High Speed Up Link Link Packet Access) system. W-CDMA is a communication system defined by 3GPP (3rd Generation Partnership Project), which is a standardization organization for mobile communication systems, and standardized release 8 editions are compiled.

In 3GPP, as a communication method different from W-CDMA, “Long Term Evolution” (Long Term Evolution LTE) is used for the radio section, and the entire system configuration including the core network (also simply referred to as network) is “System”. A new communication method called “Architecture Evolution (SAE)” is being studied. In LTE, the access scheme, radio channel configuration, and protocol are completely different from those of the current W-CDMA (HSDPA / HSUPA). For example, W-CDMA uses code division multiple access (Code Division Multiple Access), whereas LTE has OFDM (Orthogonal Frequency Division Multiplexing) in the downlink direction and SC-FDMA (Single in the uplink direction). Career Frequency Division Multiple Access). 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 referred to as EPC (Evolved Packet Core) (sometimes referred to as aGW: Access Gateway). In the LTE communication system, a unicast service and an E-MBMS service (Evolved Multimedia Broadcast Multicast Service) are provided. 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 the current decisions regarding the overall architecture of the LTE system in 3GPP. The overall architecture (Chapter 4 of Non-Patent Document 1) will be described with reference to FIG. FIG. 1 is an explanatory diagram illustrating a configuration of an LTE communication system. In FIG. 1, a control protocol (for example, RRC (Radio Resource Management)) and a user plane (for example, PDCP: Packet Data Convergence Protocol, RLC: Radio Link Control, MAC: Medium Access Control, PHY: Physical layer) for the mobile terminal 101 are based. If terminated at station 102, Evolved Universal Terrestrial Radio Access (E-UTRAN) is composed of one or more base stations 102.
The base station 102 performs scheduling (Scheduling) and transmission of a paging signal (also referred to as a paging message 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 an EPC (Evolved Packet Core) through an S1 interface. More specifically, it is connected to the MME 103 (Mobility Management Entity) via the S1_MME interface, and is 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. Further, the MME 103 performs mobility control (Mobility control) in an idle state. The MME 103 manages a tracking area list when the mobile terminal is in a standby state and an 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 at the time of handover between base stations. Further, there is a P-GW (PDN Gateway), which performs packet filtering and UE-ID address allocation for each user.

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. In FIG. 2, 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 (# 0) and sixth (# 5) subframes for each frame. The synchronization signal includes a first synchronization signal (Primary Synchronization Signal: P-SS) and a second synchronization signal (Secondary Synchronization Signal: S-SS). Channels other than MBSFN (Multimedia （Broadcast multicast service Single Frequency Network) and channels other than MBSFN are performed on a subframe basis. Hereinafter, a subframe for MBSFN transmission is referred to as an MBSFN subframe (MBSFN sub-frame). 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. In FIG. 3, 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 構成 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. In FIG. 4, a physical broadcast channel 401 (PhysicalPhysBroadcast channel: PBCH) is a downlink channel transmitted from the base station 102 to the mobile terminal 101. The BCH transport block (transport block) is mapped to four subframes in a 40 ms interval. There is no obvious signaling of 40ms timing. 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. The 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. PUSCH is mapped with UL-SCH (uplink shared channel which is one of the transport channels shown in FIG. 5). A physical HARQ indicator channel 408 (Physical Hybrid ARQ indicator: PHICH) is a downlink channel transmitted from the base station 102 to the mobile terminal 101. The PHICH carries ACK / Nack that is a response to uplink transmission. A physical random access channel 409 (Physical random access channel: PRACH) is an uplink channel transmitted from the mobile terminal 101 to the base station 102. The PRACH carries a random access preamble.

As a downlink reference signal (Reference signal), a symbol known as a mobile communication system is inserted into the first, third and last OFDM symbols of each slot. As a measurement of the physical layer of the mobile terminal, there is a reference symbol received power (RSRP).

The transport channel will be described with reference to FIG. 5 (Chapter 5 of Non-Patent Document 1). 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. As for the downlink transport 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) is applied to the downlink shared channel (Downlink Shared channel: DL-SCH). Broadcasting to the entire base station (cell) is possible. Supports dynamic or semi-static resource allocation. Quasi-static resource allocation is also called Persistent Scheduling. In order to reduce the power consumption of the mobile terminal, DRX (Discontinuous reception) of the mobile terminal is supported. 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. A multicast channel (Multicast channel: MCH) is used for broadcasting to the entire base station (cell). Supports SFN combining of MBMS services (MTCH and MCCH) in multi-cell transmission. Supports quasi-static resource allocation. MCH is mapped to PMCH.

Retransmission control by HARQ (Hybrid ARQ) is applied to the uplink shared channel (Uplink Shared channel: UL-SCH). Supports dynamic or semi-static resource allocation. 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 will be described.

HARQ is a technology for improving the communication quality of a transmission path by combining automatic retransmission (Automatic Repeat request) and error correction (Forward Error Correction). There is also an advantage that error correction functions effectively by retransmission even for a transmission path in which communication quality changes. In particular, further quality improvement can be obtained by combining the reception result of the initial transmission and the reception result of the retransmission upon retransmission. An example of the retransmission method will be described. If the reception data cannot be decoded correctly on the reception side (CRC Cyclic Redundancy Check error has occurred (CRC = NG)), "Nack" is transmitted from the reception side to the transmission side. The transmission side that has received “Nack” retransmits the data. When the reception data can be correctly decoded on the reception side (when no CRC error occurs (CRC = OK)), “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 a method in which the same data sequence is transmitted for initial transmission and retransmission, and the gain is improved by combining the initial transmission data sequence and the retransmission data sequence in retransmission. The idea is that even if there is an error in the initial transmission data, it is partially accurate, and it is possible to transmit data with higher accuracy by combining the initial transmission data and the retransmission data of the correct part. Based on. Another example of the HARQ scheme is IR (Incremental Redundancy). IR is to increase redundancy. By transmitting parity bits in retransmission, the redundancy is increased in combination with the initial transmission, and the quality is improved by the error correction function.

A logical channel (Chapter 6 of Non-Patent Document 1) will be described with reference to FIG. 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 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. In the downlink method, the CCCH is mapped to a downlink shared channel (DL-SCH) that is a transport channel. In the uplink direction, the CCCH is mapped to an uplink shared channel (UL-SCH) that is a transport 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 4). 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. There are a plurality of CSG-IDs in a mobile communication system. The CSG-ID is then used by the terminal (UE) to facilitate access of CSG related members. It has been discussed at the 3GPP meeting that the CSG cell or information broadcast by the cell is set to a tracking area code (TAC) instead of a CSG-ID. The location tracking of a 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 when communication is not performed (standby state). This area for tracking the location of the mobile terminal is called a tracking area. The CSG white list is a list stored in the USIM in which all CSG-IDs of CSG cells to which the subscriber belongs are recorded. The white list in the mobile terminal is given by the upper layer. Thereby, the base station of the CSG cell allocates radio resources to the mobile terminal.

“Suitable cell” will be described below (Non-Patent Document 4, Chapter 4.3). 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 the PLMN in the “Equivalent PLMN list”, (2) NAS (non-access stratum) The latest information must satisfy the following conditions. (1) The cell is not a barred cell. (2) The cell is not part of the “Prohibited LAs for roaming” list, but part of at least one tracking area (Tracking Area: TA). In that case, the cell needs to satisfy the above (1), (3) the cell satisfies the cell selection evaluation criteria, and (4) the cell is a system information (System Information: SI) as a CSG cell. ), The CSG-ID shall be part of the UE's “CSG White List” (CSG White List) (included in the UE CSG White List).

“Acceptable cell” is described below (Chapter 4.3 of Non-Patent Document 4). 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.

HeNB and HNB are required to support various services. For example, an operator increases the radio resources that can be used by a mobile terminal by allowing the mobile terminal to be registered in a certain HeNB and HNB and allowing only the registered mobile terminal to access the cell of the HeNB and HNB. To enable high-speed communication. Accordingly, the operator sets the charging fee higher than usual. Service. In order to realize such a service, a CSG (Closed Subscriber Group cell) cell that can be accessed only by registered (subscribed, member) mobile terminals has been introduced.

Many CSG (Closed Subscriber Group cells) cells are required to be installed in shopping streets, condominiums, schools, and companies. For example, a CSG cell is installed for each store in a shopping street, each room in an apartment, each classroom in a school, and each section in a company, and only a user registered in each CSG cell can use the CSG cell. Is required.

On the other hand, as another service, it is also considered that not only registered mobile terminals but also unregistered mobile terminals use some radio resources for the CSG cell. For example, in a CSG cell installed in a store in a shopping street, not only a clerk's mobile terminal is registered in the CSG to enable high-speed communication, but also used by a customer's mobile terminal that is not registered in the CSG Is required. In order to cope with such a case, the operation of “hybrid access mode” has been proposed for HeNB and HNB. "Hybrid access mode" means "closed access mode" (closed access mode), which is the first operation mode accessible only to registered mobile terminals, and second operation mode accessible to unregistered mobile terminals An operation mode of a CSG cell that simultaneously services both “open access mode” (third operation mode) is shown. In this case, access is permitted to unregistered mobile terminals while determining whether to permit access to registered mobile terminals. Therefore, HeNBs and HNBs that are installed in a large number of shopping streets and condominiums have a mixture of CSG cells that operate in the open access mode and CSG cells that operate in the closed access mode. Further, the HeNB and HNB are assumed to have a portable size and weight, and it is required that their installation and removal be performed frequently and flexibly. In consideration of such requirements, radio waves from many different modes of cells are transmitted simultaneously at a certain point. That is, in a shopping street, a condominium, etc., a situation occurs where the mobile terminal is in a position where radio waves from a number of cells in various modes reach.

In this way, in the case of a mobile terminal in a position where radio waves from a large number of cells set in different operation modes such as open access mode, closed access mode, and hybrid access mode can be reached, many closed access modes that cannot be accessed There is a situation in which search and cell selection are repeated endlessly for cells (CSG cells), that is, CSG cells not registered for user access. In addition, cell search is performed and the selected cell is a cell in hybrid access mode, that is, a cell that supports closed access mode and open access mode, but a mobile terminal that is not registered for user access cannot access. As a result, the cell search and cell selection are repeated again and again. In such a case, control delay, radio resource usage efficiency, and signaling efficiency decrease in the system. Further, there arises a problem that power consumption of a mobile terminal that repeats cell search increases. These problems become important when assuming the arrangement of HeNB and HNB in many different modes as described above. The present invention has been made to solve these problems.

The mobile communication system according to the present invention transmits and receives data using an OFDM (Orthogonal Frequency Division Multiplexing) method as a downlink access method and an SC-FDMA (Single Carrier Frequency Division Multiple Access) method as an uplink access method. Provided in a mobile terminal, a specific subscriber cell that is a communication cell that is permitted to be used by a specific mobile terminal or subscriber, and an unspecified user cell that is a communication cell that can be used by an unspecified mobile terminal or user And a base station controller that manages a desired tracking area where the mobile terminal is located via a plurality of base stations and performs paging processing on the mobile terminal. The mobile terminal is assigned to each communication cell. Cell identification information (PCI), which is information for identifying a communication cell, is received from the base station. In a mobile communication system that selects a cell for communication, a cell for a specific subscriber uses a first operation mode that allows a specific mobile terminal or subscriber to use and an unspecified mobile terminal or user. Cell identification information that can be used simultaneously with a second operation mode that permits use and that can be assigned to a communication cell includes a first classification assigned to a specific subscriber cell and a second assignment assigned to an unspecified user cell. The cell identification information included in the first classification is assigned to the cell for the specific subscriber that is classified into the classification and operates in the second operation mode.

The mobile communication system according to the present invention transmits and receives data using an OFDM (Orthogonal Frequency Division Multiplexing) method as a downlink access method and an SC-FDMA (Single Carrier Frequency Division Multiple Access) method as an uplink access method. Provided in a mobile terminal, a specific subscriber cell that is a communication cell that is permitted to be used by a specific mobile terminal or subscriber, and an unspecified user cell that is a communication cell that can be used by an unspecified mobile terminal or user And a base station controller that manages a desired tracking area where the mobile terminal is located via a plurality of base stations and performs paging processing on the mobile terminal. The mobile terminal is assigned to each communication cell. Cell identification information (PCI), which is information for identifying a communication cell, is received from the base station. In a mobile communication system that selects a cell for communication, a cell for a specific subscriber uses a first operation mode that allows a specific mobile terminal or subscriber to use and an unspecified mobile terminal or user. The cell identification information that can be operated in the second operation mode that permits use and the third operation mode that simultaneously processes the first operation mode and the second operation mode and that can be assigned to the communication cell is specified. It is classified into the first classification to be assigned to the subscriber cell and the second classification to be assigned to the unspecified user cell, and the specific subscriber cell operating in the third operation mode is included in the first classification. Cell identification information to be assigned.

The mobile communication system according to the present invention transmits and receives data using an OFDM (Orthogonal Frequency Division Multiplexing) method as a downlink access method and an SC-FDMA (Single Carrier Frequency Division Multiple Access) method as an uplink access method. Provided in a mobile terminal, a specific subscriber cell that is a communication cell that is permitted to be used by a specific mobile terminal or subscriber, and an unspecified user cell that is a communication cell that can be used by an unspecified mobile terminal or user And a base station controller that manages a desired tracking area where the mobile terminal is located via a plurality of base stations and performs paging processing on the mobile terminal. The mobile terminal is assigned to each communication cell. Cell identification information (PCI), which is information for identifying a communication cell, is received from the base station. In a mobile communication system that selects a cell for communication, a cell for a specific subscriber uses a first operation mode that allows a specific mobile terminal or subscriber to use and an unspecified mobile terminal or user. Cell identification information that can be used simultaneously with a second operation mode that permits use and that can be assigned to a communication cell includes a first classification assigned to a specific subscriber cell, and a second classification assigned to an unspecified user cell. Since the cell identification information included in the first classification is assigned to the cell for the specific subscriber that is classified into the classification and is operating in the second operation mode, the mobile terminal having the white list can perform the PCI for the CSG cell. By performing a search using a PCI belonging to the range, an effect that the search operation can be performed at a high speed can be obtained. This can obtain the effect of preventing the control delay of the mobile communication system. In addition, an effect of reducing power consumption of the mobile terminal can be obtained.

The mobile communication system according to the present invention transmits and receives data using an OFDM (Orthogonal Frequency Division Multiplexing) method as a downlink access method and an SC-FDMA (Single Carrier Frequency Division Multiple Access) method as an uplink access method. Provided in a mobile terminal, a specific subscriber cell that is a communication cell that is permitted to be used by a specific mobile terminal or subscriber, and an unspecified user cell that is a communication cell that can be used by an unspecified mobile terminal or user And a base station controller that manages a desired tracking area where the mobile terminal is located via a plurality of base stations and performs paging processing on the mobile terminal. The mobile terminal is assigned to each communication cell. Cell identification information (PCI), which is information for identifying a communication cell, is received from the base station. In a mobile communication system that selects a cell for communication, a cell for a specific subscriber uses a first operation mode that allows a specific mobile terminal or subscriber to use and an unspecified mobile terminal or user. The cell identification information that can be operated in the second operation mode that permits use and the third operation mode that simultaneously processes the first operation mode and the second operation mode and that can be assigned to the communication cell is specified. It is classified into the first classification assigned to the subscriber cell and the second classification assigned to the unspecified user cell, and the specific subscriber cell operating in the third operation mode is included in the first classification. Cell identification information to be assigned, so that a mobile terminal having a white list performs a search using a PCI belonging to the PCI range for the CSG cell, thereby enabling a search operation to be operated at high speed. Can be obtained. This can obtain the effect of preventing the control delay of the mobile communication system. In addition, an effect of reducing power consumption of the mobile terminal can be obtained.

It is explanatory drawing which shows the structure of the communication system of a LTE system. It is explanatory drawing which shows the structure of the communication system of a LTE system. 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 | Broadcast | multicast | multicast | service | Single | Frequency | Network) frame. It is explanatory drawing explaining the physical channel used with the communication system of a LTE system. It is explanatory drawing explaining the transport channel used with the communication system of a LTE system. It is explanatory drawing explaining the logical channel used with the communication system of a LTE system. It is a block diagram which shows the whole structure of the mobile communication system currently discussed by 3GPP. It is a block diagram which shows the structure of the mobile terminal 311 which concerns on this invention. It is a block diagram which shows the structure of the base station 312 which concerns on this invention. It is a block diagram which shows the structure of MME which concerns on this invention. It is a block diagram which shows the structure of HeNBGW which concerns on this invention. It is a flowchart which shows the outline of the cell search which a mobile terminal (UE) performs in the communication system of a LTE system. It is a conceptual diagram of PCI split. 6 is a flowchart showing cell selection processing of the mobile terminal according to the second embodiment. 6 is a flowchart showing processing of the mobile terminal according to the second embodiment. It is a flowchart which shows the process of the mobile terminal of Embodiment 2 modification. 10 is a flowchart showing processing of a mobile terminal according to the third embodiment. It is a block diagram which shows the whole structure of the mobile communication system currently discussed by 3GPP. FIG. 10 is an explanatory diagram of a cell installation example used in the fourth embodiment. FIG. 10 is a sequence diagram of a mobile communication system in the solution of the fourth embodiment. FIG. 10 is a sequence diagram of a mobile communication system in the solution of the first modification of the fourth embodiment. FIG. 10 is a sequence diagram of a mobile communication system in the solution of the second modification of the fourth embodiment.

Hereinafter, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 7 is a block diagram showing the overall configuration of an LTE mobile communication system currently under discussion in 3GPP. Currently, in 3GPP, CSG (Closed Subscriber Group) cells (e-UTRAN Home-eNodeB (Home-eNB, HeNB), UTRAN Home-NB (HNB)) and non-CSG cells (e-UTRAN eNodeB (eNB) ), UTRAN NodeB (NB), GERAN BSS) and other systems are being studied. For e-UTRAN, configurations such as (a) and (b) in FIG. It has been proposed (Non-Patent Document 1, Non-Patent Document 3). FIG. 7A will be described. 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 (CSG cell) 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 are connected to one eNB. 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.

Next, FIG. 7B will be described. 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 (CSG cell) 72-2. As in FIG. 7A, 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 are connected to one eNB. On the other hand, the Home-eNB 72-2 is connected to the MME 73 via a HeNBGW (Home-eNB Gateway) 74. Home-eNB and HeGW are connected by an interface S1, and HeNBGW 74 and MME 73 are connected through an interface S1_flex. 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_flex.

By connecting one HeNBGW 74 to a Home-eNB belonging to the same CSG-ID using the configuration of FIG. 7B, a plurality of information belonging to the same CSG-ID, such as registration information, can be obtained from the MME 73. When transmitting to the Home-eNB 72-2, it is transmitted to the HeNBGW 74 once, and then transmitted to the plurality of Home-eNBs 7-2, thereby signaling efficiency more directly than the plurality of Home-eNBs 72-2 respectively. Can be enhanced. On the other hand, when each Home-eNB 72-2 communicates individual information with the MME 73, the Home-eNB 72-2 passes through the HeNBGW 74 but only passes (transmits) the information without processing. And MME 73 can communicate with each other as if they were directly connected.

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. In addition, 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. Of the decoded data, 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. 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. There may exist data that is directly output from the transmission data buffer unit 904 to the modulation unit 906 without being encoded. 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. Further, 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.

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. When 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 When 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.

When the data received from the PDN GW is control data, the control data is passed from the PDN GW communication unit 1001 to the control plane control unit 1005. When the data received from the base station 72 is control data, 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. Further, the result processed by the 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. 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. In the management of 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. In white list management, 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. Although these CSG-related management may be performed in other parts of the MME 73, tracking by the idle state mobility management unit 1005-3 instead of the CSG-ID currently being discussed at the 3GPP meeting A method using an area code (Tracking Area Code) can be performed efficiently. 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).

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_flex 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).

Next, an example of a general cell search method in a mobile communication system is shown. 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. When cell search is started in the mobile terminal, slot timing and frame timing using the first synchronization signal (P-SS) and the second synchronization signal (S-SS) transmitted from the neighboring base stations in step ST1201. 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. Currently, 504 PCIs are being studied, and the 504 PCIs are used for synchronization, and the PCI of the synchronized cell is detected (specified). Next, for a synchronized cell, in step ST1202, a reference signal RS (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. Next, in ST1203, a cell having the best RS reception quality (for example, a cell having the highest RS reception power) (best cell) is selected from one or more cells detected up to ST1202. Next, in ST 1204, PBCH of the best cell is received, and BCCH which is broadcast information is obtained. MIB (Master Information Block) including cell configuration information is carried on BCCH on PBCH. MIB information includes, for example, DL (downlink) system bandwidth, the number of transmission antennas, SFN (SystemＦFrame Number), and the like.

Next, at 1205, the DL-SCH of the cell is received based on the MIB cell configuration information, and SIB (System Information Block) 1 in the broadcast information BCCH is obtained. SIB1 includes information about access to the cell, information about cell selection, and scheduling information of other SIBs (SIBk; integer of k ≧ 2). SIB1 includes TAC (Tracking Area Code). Next, in ST1206, 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. If they are different from each other, 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. After updating the TA, 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.

In LTE and UMTS (Universal Mobile Telecommunication System), introduction of a CSG (Closed Subscriber Group) cell is being studied. As described above, 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. In addition, 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. Specifically, the white list is stored in the SIM / USIM. The white list carries CSG information of the CSG cell registered by the mobile terminal. Specifically, CSG-ID, TAI (Tracking Area Identity), TAC, etc. can be considered as CSG information. If CSG-ID and TAC are associated with each other, either one is sufficient. Further, GCI may be used if CSG-ID or TAC is associated with GCI (Global Cell Identity). From the above, 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. On the other hand, a mobile terminal having a white list can access both a CSG cell of a registered CSG-ID and a non-CSG cell.
In 3GPP, it is discussed to divide all PCIs (Physical Cell Identity) into CSG cells and non-CSG cells (referred to as PCI split) (Non-Patent Document 5). Further, it is discussed that the 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). On the other hand, a mobile terminal having PCI split information can perform a cell search using the PCI split information.
Non-Patent Document 6 discloses three different modes of access to HeNB and HNB. An open access mode, a closed access mode, and a hybrid access mode. Each mode has the following characteristics. In the open access mode, the HeNB or HNB is operated as a normal cell of a normal operator. In the closed access mode, the HeNB or HNB is operated as a CSG cell. This is a CSG cell accessible only to CSG members. In the hybrid access mode, a non-CSG member is a CSG cell to which access is permitted at the same time.

The practical example of the hybrid access mode is shown below. It is considered that HeNB (or HNB) may be arranged to improve coverage in the shopping mall. Consider a case where the HeNB is operated in the hybrid access mode. It is assumed that the shopping mall owner and employee can receive a preferential charge when receiving services via the HeNB by registering with the HeNB. This method of use is a method of using the closed access mode. On the other hand, customers who are not registered in the HeNB can also receive services via the HeNB. This method of use is a method of using the open access mode. As described above, the hybrid access mode is a mode that operates as a closed access mode for registered users and simultaneously operates as an open access mode for unregistered users. Therefore, the hybrid access mode is different from the open access mode and the closed access mode.

Also, a specific example of closed access mode service is shown. By permitting access to the cell only to the registered mobile terminal, the radio resources that can be used by the mobile terminal can be increased to enable high-speed communication. Accordingly, the operator sets the charging fee higher than usual. Service. In contrast, a cell in hybrid access mode serves both closed access mode and open access mode simultaneously. In this case, only the registered mobile terminal is not permitted to access. The mobile terminal in the open access mode also uses the radio resource of the cell. Accordingly, the communication speed of the closed access mode in the hybrid access mode cell is equal to or lower than the communication speed of the closed access mode cell. The operator reduces the billing fee accordingly. The use of such services is being considered. Therefore, the mobile terminal needs to be able to determine whether to select the closed access mode cell or the hybrid access mode cell from the cell search and cell selection. For this reason, in 3GPP, it has been proposed to broadcast an indicator (Hybrid access indicator) indicating whether the access mode of a cell is hybrid or closed to broadcasted mobile terminals (Non-patent Document 8). . Non-Patent Document 7 describes signaling related to PCI split. However, there is no description regarding the hybrid access mode of HeNB and HNB.

Non-Patent Document 7 describes a signaling method for PCI split information. In the signaling method shown in Non-Patent Document 7, it is necessary to notify the code value by a start code or an enumerated value. For example, when there are 504 codes in all PCIs, 9 bits are required to indicate 504 codes. In the present embodiment, a method for notifying PCI split information from a base station to a mobile terminal by a method different from Non-Patent Document 7 is disclosed. In the present embodiment, PCI split information is indicated by “number of divisions” and “number of remainders” of the PCI code. As a specific example, (the number of PCI codes) MOD X = Y. PCI split information is indicated by the values of X and Y. For example, X may be 2, Y = 0 may be used for the CSG cell, and Y = 1 may be used for the non-CSG cell. The PCI split information notified from the base station to the mobile terminal using radio resources is the X value, the Y value for the CSG cell, and the Y value for the non-CSG cell. In comparison, the amount of information is reduced, and the effect of effective use of radio resources can be obtained. For example, if Y = 0 is assigned to a non-CSG cell, if it is determined statically or semi-statically, only the X value and the Y value for the CSG cell are required from the base station to the mobile terminal. As a result, the amount of information can be further reduced, and radio resources can be effectively used. Further, there is an advantage that the ratio of the PCI range for the CSG cell and the PCI range for the non-CSG cell can be easily changed by changing the X value. For example, X may be 3, Y = 0, 1 for the CSG cell, and Y = 2 for the non-CSG cell. As a result, the PCI range for the CSG cell can be doubled compared to the PCI range for the non-CSG cell.

Embodiment 2. FIG.
The subject of this Embodiment is shown below. When a HeNB (which may be HNB) is operated in the hybrid access mode, although it is a CSG cell, a non-CSG member is a cell to which access is permitted at the same time. Therefore, it is assumed that the PCI included in the PCI range for the non-CSG cell is allocated to the HeNB operated in the hybrid access mode by the conventional PCI split. In this case, after the mobile terminal having the white list (the mobile terminal registered in any CSG cell) receives the PCI split information, the PCI included in the PCI range for the non-CSG cell is allocated by the cell search operation. There arises a problem that the HeNB operated in the hybrid access mode is excluded from the target. There are mobile terminals that are excluded from search targets even though they are registered in the HeNB operated in the hybrid access mode. This is because the mobile terminal registered in the HeNB operated in the hybrid access mode in the case of a mobile communication system that can be charged preferentially when the registered mobile terminal performs communication in the CSG cell. In spite of being within the coverage of the HeNB, the HeNB is excluded from the search target, and a problem that is disadvantageous for the user who cannot receive the charge preferential treatment occurs. On the contrary, if the HeNB operated in the hybrid access mode is not excluded from the search target, the mobile terminal having the white list performs the cell search operation for all cells even after receiving the PCI split information. As a result, there is a problem that it takes a long time to select (or reselect) a CSG cell. This causes problems such as system control delay and increased power consumption of the mobile terminal.

In the present embodiment, the above problem is solved by the following method. PCI for CSG cells is allocated to the HeNB operated in the hybrid access mode as the mobile communication system. As in the prior art, the PCI belonging to the PCI range for the CSG cell in the conventional PCI split is not allocated only to the CSG cell, but is allocated to the CSG cell and the HeNB operated in the hybrid access mode in this embodiment. The concept will be described with reference to FIG. FIG. 13 shows a conceptual diagram of PCI split in the current 3GPP discussion.
A range A indicates all PCIs. For example, there are 504 ways (504 codes). For example, the PCI range for the CSG cell is set as range B. For example, a PCI range for a non-CSG cell is set as a range C. In the present embodiment, for example, PCI belonging to range B is allocated to the HeNB operated in the hybrid access mode with the CSG cell. PCIs belonging to range C are assigned to non-CSG cells. In other words, the cell identification information (PCI) includes the PCI (first classification) included in the range B allocated to the CSG cell (specific subscriber cell) and the non-CSG cell (unspecified user). Are classified into two types of PCI (second classification) included in the range C to be assigned to the cell. In the present embodiment, PCI included in range B is assigned to a cell operating in the hybrid access mode.

Next, an example of operation as a mobile terminal in the present embodiment will be described using FIG.
In Step ST6101, the mobile terminal receives the PCI split information disclosed in the present embodiment from the base station (macro cell, HeNB, HNB, CSG cell, non-CSG cell, etc.), and has PCI split information. Determine whether. When not having, it transfers to step ST6102. If so, the mobile terminal makes a transition to step ST6104. In step ST6102, the mobile terminal performs cell search in the entire PCI range. In step ST6103, the mobile terminal determines whether cell selection has been performed. If so, the process ends. If not, the process returns to step ST6101.

A detailed operation example of cell selection performed in step ST6103 will be described with reference to FIG. In Step ST1501, the mobile terminal selects a cell with the best reception quality of the reference signal (Reference signal: RS) (for example, a cell with the highest RS reception power) as the best cell. In Step ST1801, the mobile terminal determines whether the best cell is a CSG cell, a non-CSG cell, or a HeNB operated in the hybrid access mode. For this determination, a CSG indicator (Non-patent Document 9) mapped to system information broadcast from the base station can be used. Moreover, the hybrid access indicator (nonpatent literature 8) mapped by the system information alert | reported from a base station can be used. When it is a non-CSG cell, it transfers to step ST1503. When it is a CSG cell, it transfers to step ST1508. When the HeNB is operated in the hybrid access mode, the mobile terminal makes a transition to step ST1802. In Step ST1503, the mobile terminal determines whether or not to perform cell selection with priority on the CSG cell in the current cell search. When the cell selection is not performed with priority on the CSG cell, the mobile terminal makes a transition to step ST1504. When performing cell selection with priority on the CSG cell, the mobile terminal makes a transition to step ST1505. In step ST1504, the mobile terminal selects the cell. Thereafter, the process ends. In Step ST1505, the mobile terminal removes the cell from the cell search target, and moves to Step ST1506. In step ST1506, the mobile terminal determines whether to continue the search. A specific example of whether or not to continue is that if there are other cells that are subject to cell search, the search is judged to be continued, and if there are no other cells that are subject to cell search, the search is continued. Judge that there is no. Further, it is determined that the search is continued if it is within an allowable time from the start of cell search to the completion of cell selection, and it is determined that the search is not continued if the allowable time has expired or has expired. When continuing a search, it transfers to step ST1507. If the search is not continued, the process ends. In Step ST1507, the mobile terminal receives the PCI split information disclosed in the present embodiment from the base station (macro cell, HeNB, HNB, CSG cell, non-CSG cell, etc.) and has PCI split information. Determine whether. When not having, it returns to step ST1501. If so, the mobile terminal makes a transition to step ST6104 in FIG.

In Step ST1508, the mobile terminal determines whether it has a CSG-ID in the white list. In other words, it is determined whether it is registered in any CSG cell. If it has a CSG-ID or if it is registered in a CSG cell, the mobile terminal makes a transition to step ST1509. If it does not have a CSG-ID or if it is not registered in the CSG cell, the mobile terminal makes a transition to step ST1510. In Step ST1509, the mobile terminal determines whether the CSG-ID of the cell is included in the white list. In other words, it is determined whether or not the cell is registered in the CSG-ID of the cell. If it has the CSG-ID, or if it has been registered with the CSG-ID, the mobile terminal makes a transition to step ST1504. If it does not have the CSG-ID, or if it is not registered with the CSG-ID, the mobile terminal makes a transition to step ST1510. A mobile terminal removes the said cell from the object of a cell search in step ST1510, and transfers to step ST1511. In step ST1511, the mobile terminal determines whether to continue the search. A specific example of whether or not to continue is that if there are other cells that are subject to cell search, the search is judged to be continued, and if there are no other cells that are subject to cell search, the search is continued. Judge that there is no. Further, it is determined that the search is continued if it is within an allowable time from the start of cell search to the completion of cell selection, and it is determined that the search is not continued if the allowable time has expired or has expired.
When continuing the search, the mobile terminal makes a transition to step ST1512. If the search is not continued, the process ends. In Step ST1512, the mobile terminal receives the PCI split information disclosed in the present embodiment from the base station (macro cell, HeNB, HNB, CSG cell, non-CSG cell, etc.) and has PCI split information. Determine whether. When not having, it returns to step ST1501. If so, the mobile terminal makes a transition to step ST6104 in FIG. In step ST1802, the mobile terminal determines whether it has a CSG-ID in the white list. In other words, it is determined whether it is registered in any CSG cell. If it has a CSG-ID or if it is registered in a CSG cell, the mobile terminal makes a transition to step ST1803. If the mobile terminal does not have a CSG-ID or has not registered in the CSG cell, the mobile terminal makes a transition to step ST1504. In Step ST1803, the user equipment determines whether to select a cell with priority on the CSG cell. When cell selection is not performed with priority on CSG cells, the mobile terminal makes a transition to step ST1504. When performing cell selection with priority on the CSG cell, the mobile terminal makes a transition to step ST1509.

In step ST6104, the mobile terminal determines whether it has a CSG-ID in the white list. In other words, it is determined whether it is registered in any CSG cell. If it has a CSG-ID or if it is registered in a CSG cell, the mobile terminal makes a transition to step ST6105. If the mobile terminal does not have a CSG-ID or has not registered in the CSG cell, the mobile terminal makes a transition to step ST6109. In Step ST6105, the mobile terminal performs a cell search using a PCI belonging to the PCI range for the CSG cell using the PCI split information disclosed in the present embodiment, and moves to Step ST6106. In step ST6106, the mobile terminal determines whether cell selection has been performed. If so, the process ends. When not performed, it transfers to step ST6107. A detailed operation example of cell selection performed in step ST6106 will be described with reference to FIG. Unlike step 6103, step ST6106 is a cell selection operation of a mobile terminal that has PCI split information, performs a cell search using a PCI belonging to the PCI range for the CSG cell, and has a white list. Therefore, after the processing in step 1501 in FIG. 14, it is determined in step ST1801 that the CSG cell or the HeNB operated in the hybrid access mode. If it is determined as a CSG cell, the process proceeds to step ST1508, YES is determined in step ST1508, it is determined in step ST1509, and the process proceeds to step ST1504 or step ST1510. After the process of step ST1510, it is determined in step ST1511, and step ST1512 or the process ends. In step ST1512, YES is determined. When it is determined that the HeNB is operated in the hybrid access mode, YES is determined in step ST1802, YES is determined in step ST1803, and the process proceeds to step ST1509.

In step ST6107, the mobile terminal determines that there is no CSG cell registered in the vicinity, and that there is no HeNB operated in the hybrid access mode, and selects a non-CSG cell in this embodiment. The cell search is performed using the PCI belonging to the PCI range for the non-CSG cell using the disclosed PCI split information, and the process proceeds to step ST6108. In Step ST6108, the mobile terminal determines whether cell selection has been performed. If so, the process ends. If not, the process returns to step ST6105. A detailed operation example of cell selection performed in step ST6108 will be described with reference to FIG. In step ST6108, unlike step 6103, a mobile terminal that has PCI split information, performs a cell search using a PCI belonging to the PCI range for a non-CSG cell, and does not prioritize the CSG cell in the current cell search. This is a cell selection operation. Therefore, after the process of step 1501 in FIG. 14, it is determined as a non-CSG cell in step ST1801, NO is determined in step ST1503, and the process of step ST1504 is performed.
In Step ST6109 of FIG. 15, the mobile terminal performs cell search in the entire PCI range. In Step ST6110, the mobile terminal selects the cell with the best reception quality of the reference signal (Reference signal: RS) (for example, the cell with the highest received power of RS) as the best cell. In Step ST6111, the mobile terminal determines whether the best cell is a non-CSG cell or a HeNB operated in the hybrid access mode. For this determination, a CSG indicator mapped to system information broadcast from the base station can be used. Further, a hybrid access indicator mapped to system information broadcast from the base station can be used. If it is a non-CSG cell or a HeNB operated in the hybrid access mode, the mobile terminal makes a transition to step ST6113. If it does not come out in the non-CSG cell or the HeNB operated in the hybrid access mode, in other words, if it is a CSG cell, the mobile terminal makes a transition to step ST6112. In Step ST6112, the mobile terminal removes the cell from the cell search target, and moves to Step ST6109. In Step ST6113, the mobile terminal selects the cell. Thereafter, the process ends.

The following effects can be obtained by this embodiment. If a mobile terminal having a white list performs a search using a PCI belonging to the PCI range for the CSG cell, it becomes possible to search for a HeNB operated in the hybrid access mode with the CSG cell. That is, it is possible to search HeNBs operated in the hybrid access mode without searching using PCIs belonging to the PCI range for non-CSG cells. In the related art, in order for a mobile terminal having a white list to search for a HeNB operated in the hybrid access mode, it is necessary to search the entire PCI range. For example, in a mobile communication system in which when a registered mobile terminal communicates in the CSG cell, charging preferential treatment is received, the mobile terminal preferentially selects the HeNB operated in the CSG cell or the hybrid access mode. In the present embodiment, when a cell is desired to be selected, a cell search operation can be performed except for the non-CSG cell in the PCI detection stage (step ST1201 in FIG. 12). On the other hand, in the conventional technique, if the system information SIB1 is not received, it is unknown whether it is a non-CSG cell or a CSG cell. Further, if the system information SIB1 is not received, it is unclear whether or not the system is operated in the hybrid access mode. Therefore, until system information (SIB1) is received (step ST1205 in FIG. 12), it is not possible to perform a cell search by removing a non-CSG cell or the like from a search target, or to select a HeNB operated in a hybrid mode. It becomes possible. By using this embodiment in this way, it is possible to obtain an effect that the search operation can be operated at high speed. This can obtain the effect of preventing the control delay of the mobile communication system. In addition, an effect of reducing power consumption of the mobile terminal can be obtained. This also makes it unnecessary to change to the PCI split method by introducing HeNB operated in the hybrid access mode. Thereby, the effect of avoiding the complexity of the mobile communication system can be obtained.

Embodiment 2 Modification 1
In the above solution, the cell search operation of a mobile terminal having a white list has been accelerated compared to the prior art, but the cell search operation of a mobile terminal having no white list has not been accelerated. . Specifically, after a mobile terminal not having a white list (a mobile terminal not registered in the CSG cell) receives PCI split information, a hybrid in which a PCI included in the PCI range for the CSG cell is allocated in a cell search operation. There arises a problem that the HeNB operated in the access mode is removed from the target cell. The HeNB operated in the hybrid access mode is excluded from the search target even though it is a non-CSG member access permitted mode. Therefore, the problem that the mobile terminal which does not have the white list which exists in the coverage of HeNB operated by hybrid access mode does not perform cell selection of the said HeNB occurs. This means that communication cannot be performed at a communicable location due to inconvenience of PCI allocation. On the other hand, if the HeNB operated in the hybrid access mode is not excluded from the search target in the above, the cell search operation targeting all cells even after the mobile terminal without the white list receives the PCI split information This causes problems such as system control delay and increased power consumption of the mobile terminal. In the case of a mobile terminal that does not have a white list at a position where radio waves from a large number of CSG cells can reach, a number of inaccessible CSG cells (that is, CSG cells that are not registered for user access) are searched endlessly. Repeated situations arise.
In such a case, control delay, radio resource usage efficiency, and signaling efficiency decrease in the system. Further, there arises a problem that power consumption of a mobile terminal that repeats cell search increases. These problems become important when assuming the future arrangement of CSG cells as described above.

In this modification, a method for solving the above problem is disclosed. The base station notifies the mobile terminals being served as to whether or not there is a HeNB operated in the hybrid access mode in the neighboring cell (hereinafter referred to as “neighboring hybrid status”). The base station notifies a mobile terminal being served thereby of whether there is a HeNB operated in the hybrid access mode in the vicinity of the own cell or in the measurement target cell. Specifically, a 1-bit indicator may be provided so that “1” is set when it is present, and “0” is set when it is not present (or vice versa).

A specific example of the notification method of the surrounding hybrid status is shown below. It is mapped to a broadcast control channel (BCCH) that is a logical channel, further mapped to a broadcast channel (BCH) that is a transport channel, and a physical broadcast channel (PBCH) that is a physical channel, and is notified to the mobile terminal. It is mapped to master information, mapped to a master information block (MIB), mapped to a broadcast control channel (BCCH) that is a logical channel, further broadcast channel (BCH) that is a transport channel, physical broadcast channel that is a physical channel ( PBCH) and notified to the mobile terminal. When the peripheral hybrid situation is mapped to the MIB, the following effects can be obtained. For example, in an LTE communication system, there is MIB or SIB1 as broadcast information received at the minimum necessary for an operation waiting from a cell search. Therefore, by including the surrounding hybrid status in the broadcast information received at the minimum necessary for the operation waiting from the cell search, the mobile terminal does not need to obtain another broadcast information block, and the surrounding hybrid status can be quickly reduced with low power consumption. Can be obtained.

The peripheral hybrid situation is mapped to the broadcast control channel (BCCH), which is a logical channel, and further mapped to the downlink shared channel (DL-SCH), which is a transport channel, and the physical downlink shared channel (PDSCH), which is a physical channel. Notified to the terminal.
It is mapped to system information, mapped to a system information block (SIB), mapped to a broadcast control channel (BCCH) that is a logical channel, further a downlink shared channel (DL-SCH) that is a transport channel, and a physical that is a physical channel It is mapped to the downlink shared channel (PDSCH) and notified to the mobile terminal. When the peripheral hybrid status is mapped to SIB1 in the system information, the following effects can be obtained. For example, in an LTE communication system, MIB or SIB1 is broadcast information received as a minimum necessary for an operation waiting from a cell search. Therefore, by including the neighboring hybrid status in the broadcast information received at the minimum necessary for the operation waiting from the cell search, the mobile terminal does not need to obtain other broadcast information blocks and can quickly obtain the neighboring hybrid status with low power consumption. Can be obtained. Also, the current 3GPP and below are being discussed. The CSG indicator, which indicates that the cell is a CSG cell, is the direction mapped to SIB1. The hybrid access indicator for distinguishing the hybrid access mode is the direction mapped to SIB1. Further, SIB1 is a direction in which cell reselection common information is mapped. Under such circumstances, it is possible to map the surrounding hybrid status, which is information used when determining whether or not to perform a cell search operation to search for a HeNB operated in the hybrid access mode, to the SIB1. The mobile terminal can obtain the parameters used in the cell search process of the mobile terminal by receiving the same system information, and the effects of avoiding the operation complexity of the mobile terminal and preventing control delay can be obtained.

When the peripheral hybrid status is mapped to SIB4 in the system information, the following effects can be obtained. In the current 3GPP, the inter-frequency neighboring cell list (intra Freq Neighbouring Cell List) is mapped to SIB4. Under such circumstances, it becomes possible for the mobile terminal to obtain the parameters used in the process of obtaining the status of the neighboring cell by receiving the same system information, thereby avoiding complexity and control of the operation of the mobile terminal. The effect of delay prevention can be obtained. In addition, the HeNB operated in the hybrid access mode may be included in the inter-frequency neighboring cell list. Moreover, you may have an indicator which shows whether it is HeNB operate | moved by a hybrid access mode for every cell of the periphery cell list between the same frequency. When the peripheral hybrid status is mapped to SIB9 in the system information, the following effects can be obtained. In the current 3GPP, the HeNB identifier (a home eNB identifier (HNBID)) is mapped to the SIB9. Under such circumstances, it becomes possible for the mobile terminal to obtain parameters used in the process of obtaining information related to the HeNB by receiving the same system information, avoiding the complexity of operation of the mobile terminal, and controlling delay. The effect of prevention can be obtained. Also, when the peripheral hybrid status is mapped to SIB4 or SIB9 in the system information, the amount of information transmitted and the amount of signaling can be reduced compared to mapping to SIB1 that is repeatedly transmitted in a relatively short period. For this reason, it is possible to obtain an effect that the mobile terminal can obtain the system information without increasing the signaling load as the system.

Or in the neighboring hybrid situation, the parameters related to the physical resource of common recognition are the logical control channel (CCCH), dedicated control channel (DCCH), multicast control channel (MCCH), or multicast traffic channel (MTCH). Is further mapped to the downlink shared channel (DL-SCH) which is a transport channel and the physical downlink shared channel (PDSCH) which is a physical channel, and is notified to the mobile terminal.

Next, an example of the operation as a mobile terminal in this modification will be described with reference to FIG. FIG. 16 has parts similar to FIG. Therefore, the description of the same step number is omitted. In Step ST6201, the mobile terminal determines whether there is a HeNB operated in the hybrid access mode in the neighboring cell (or in the measurement target cell). For this determination, the “peripheral hybrid status” disclosed in the present modification, which is mapped to information broadcast from the base station, can be used. When there is a HeNB operated in the hybrid access mode in the neighboring cell, the mobile terminal makes a transition to step ST6109. When it does not exist, it transfers to step ST6202. In Step ST6202, the user equipment performs a cell search using the PCI belonging to the PCI range for the non-CSG cell using the PCI split information disclosed in the present embodiment, and moves to Step ST6203. A mobile terminal judges whether cell selection was performed in step ST6203. If so, the process ends. If not, the process returns to step ST6202. A detailed operation example of cell selection performed in step ST6203 will be described with reference to FIG. In step ST6203, unlike step ST6103, it has PCI split information, performs a cell search with a PCI belonging to the PCI range for a non-CSG cell, does not have a white list, and selects a CSG cell with the current cell search. This is a cell selection operation of a mobile terminal not prioritized. Therefore, after the processing of step ST1501 in FIG. 14, it is determined as a non-CSG cell in step ST1801, and the process proceeds to step ST1503. In step ST1503, NO is determined, and the process proceeds to step ST1504.

This modification can obtain the following effects in addition to the effects of the second embodiment. It is possible to increase the cell search speed of a mobile terminal that does not have a white list. There is no need for a mobile terminal not having a white list to search using a PCI belonging to the PCI range for the CSG cell in an environment where there is no HeNB operated in the hybrid access mode. This can provide an effect that the search operation can be operated at high speed. This can obtain the effect of preventing the control delay of the mobile communication system. In addition, an effect of reducing power consumption of the mobile terminal can be obtained. Assuming future CSG cell placement, this is an important effect.

Embodiment 3 FIG.
In the first modification of the second embodiment, it is disclosed that the base station notifies the mobile terminals being served thereof of the surrounding hybrid status. As a specific example of the notification of the peripheral hybrid status, it has been disclosed to notify whether or not a HeNB operating in the hybrid access mode exists in the peripheral cell. Further, as another specific example, it has been disclosed that a mobile terminal being served thereby is notified of whether there is a HeNB operating in the hybrid access mode in the vicinity of the own cell or in the measurement target cell.

In the third embodiment, seven more specific examples of notification of the surrounding hybrid status are disclosed below.

(1) Notify that there is a HeNB operating in the hybrid access mode in the vicinity (in the neighboring cell or the measurement target cell, and so on). The measurement target cell means, for example, a cell from which the mobile terminal is required to measure from the network side to the mobile terminal.

(2) Notify that there is no HeNB operating in the hybrid access mode in the vicinity.

(3) Notify the PCI of the HeNB operating in the hybrid access mode that exists in the vicinity. For example, consider a case where the neighboring hybrid status is notified using a neighboring cell list (NCL: Neighboring Cell List), a neighboring cell list between different frequencies, or a neighboring cell list between different systems. By notifying the neighboring hybrid status by each neighboring cell list, it becomes possible for the mobile terminal to receive information on neighboring cells together, thereby avoiding the operation complexity of the mobile terminal, preventing control delay, and reducing the processing load. Obtainable.
Two specific examples of the method of notifying the PCI of the HeNB operating in the hybrid access mode existing in the vicinity using the neighbor cell list are disclosed below.

(3-1) Notify the neighboring hybrid status in the current neighboring cell list. Information that makes it possible to distinguish the cell operating in the hybrid access mode together with the PCI of the neighboring cell may be added. Four specific examples of information that can be distinguished are disclosed below.

(3-1-1) Indicates the access mode. For example, a closed access mode, an open access mode, and a hybrid access mode are shown.

(3-1-2) Indicates whether or not the hybrid access mode.

(3-1-3) Indicates that it is in hybrid access mode.

(3-1-4) Indicates that it is not in the hybrid access mode.

(3-2) Notify the PCI of the HeNB operating in the hybrid access mode by separating from the current neighboring cell list. The peripheral cell list may be separated according to the access mode of the peripheral cell. The mobile terminal can recognize from the neighboring cell list separated for each access mode that each cell with PCI included in the neighboring cell list operates in each access mode. Further, a peripheral cell list for cells operating in the hybrid access mode may be provided. The mobile terminal can recognize that the cell with PCI included in the neighboring cell list for the cell operating in the hybrid access mode is operating in the hybrid access mode.

(4) Notify the range of PCI allocated to the hybrid cell (cell operating in the hybrid access mode). Notification may be made only when there is a cell operating in the hybrid access mode in the vicinity.

In 3GPP, it is proposed to reserve a subset of PCIs / PSCs for a hybrid cell from a set of PCIs / PCSs that can be used for a macro cell and broadcast the information to a mobile terminal (Non-Patent Document 10). . That is, it has been proposed to reserve a PCI range (hereinafter, referred to as a hybrid cell PCI range) used by the hybrid cell in the non-CSG PCI. On the other hand, details about a method for notifying a mobile terminal of a PCI range for a hybrid cell are not disclosed.

The following effects can be obtained by notifying the PCI range allocated to the hybrid cell from the serving cell only when there is a cell operating in the hybrid access mode in the neighboring cell. By notifying the range of PCI allocated to the hybrid cell, whether or not the HeNB operating in the hybrid access mode exists in the neighboring cell shown in the first modification of the second embodiment, or the neighboring hybrid in the present embodiment A further specific example (1) of the situation, “there is a HeNB that operates in the hybrid access mode in the vicinity”, or “a hybrid in the vicinity”, which is a further specific example (2) of the peripheral hybrid situation in the present embodiment. The same information can be notified without notifying that there is no HeNB operating in the access mode. Thereby, the effect of avoiding the complexity of the mobile communication system due to effective utilization of radio resources and an increase in notification information can be obtained.

(5) Notify the range of PCI allocated to hybrid cells existing in the vicinity. Thereby, compared with the further specific example (4) of the surrounding hybrid situation in the present embodiment, the number of PCIs used by the mobile terminal for cell search for detection of the HeNB operating in the hybrid access mode. Can be reduced. Thereby, the effect of reducing the processing load on the mobile terminal can be obtained.

In this embodiment, the notification method of the surrounding hybrid status is the same as that in the first modification of the second embodiment, and thus the description thereof is omitted.

(6) The fact that there is a HeNB that operates in the hybrid access mode at the current carrier frequency (also referred to as a serving frequency), or that there is no HeNB that operates in the hybrid access mode, or there is a HeNB that operates in the hybrid access mode. Notify if it exists. Since this information does not depend on the situation of neighboring cells, the effect of avoiding the complexity of the mobile communication system can be obtained.

(7) Whether there is an HeNB that operates in the hybrid access mode in the current mobile communication system, or no HeNB that operates in the hybrid access mode, or whether there is an HeNB that operates in the hybrid access mode. Notice.
Since the information does not depend on the situation of the neighboring cells and the carrier frequency, an effect of avoiding the complexity of the mobile communication system can be obtained. Release is divided depending on whether or not there is an HeNB that operates in the hybrid access mode, and notification of the release version indicates that there is an HeNB that operates in the hybrid access mode in the current mobile communication system, or operates in the hybrid access mode. It is only necessary to have information indicating that there is no HeNB or whether there is a HeNB operating in the hybrid access mode. Thereby, the effect of avoiding the complexity of the mobile communication system due to effective utilization of radio resources and an increase in notification information can be obtained.

An example of operation as a mobile terminal in this embodiment will be described. An example of the operation as a mobile terminal in the case where further specific examples (1) and (2) of the surrounding hybrid situation in the present embodiment are applied is the same as that of the first modification of the second embodiment (FIG. 16). Therefore, explanation is omitted. An example of the operation as a mobile terminal when a further specific example (3) of the surrounding hybrid situation in the present embodiment is applied will be described with reference to FIG. The same reference numerals as those in FIG. 15 and FIG.

In step ST1701, the mobile terminal determines whether there is a HeNB operating in the hybrid access mode in the neighboring cells (or measurement target cells). For this determination, the PCI of the HeNB operating in the hybrid access mode existing in the vicinity, which is the “peripheral hybrid status” notified from the base station, can be used. If there is a notification of the PCI of the HeNB operating in the hybrid access mode existing in the vicinity, it is determined that there is a HeNB operating in the hybrid access mode in the peripheral cell, and the process proceeds to step ST1702. If there is no notification of the PCI of the HeNB operating in the hybrid access mode existing in the vicinity, it is determined that there is no HeNB operating in the hybrid access mode in the peripheral cell, and the mobile terminal makes a transition to step ST6202.

In step ST1702, the mobile terminal performs cell search using the PCI of the HeNB operating in the hybrid access mode existing in the vicinity, which is the “peripheral hybrid status” notified from the base station. In Step ST1703, the mobile terminal performs a cell search using the PCI belonging to the PCI range for the non-CSG cell using the PCI split information.

An example of the operation as a mobile terminal when a further specific example (4) of the surrounding hybrid situation in the present embodiment is applied, will be described with reference to FIG. The same reference numerals as those in FIG. 15 and FIG.

In step ST1701, the mobile terminal determines whether there is a HeNB operating in the hybrid access mode in the neighboring cells (or measurement target cells). This determination can use the PCI range allocated to the hybrid cell that is notified only when the hybrid access mode exists in the neighboring cell, which is the “neighboring hybrid status” notified from the base station. If there is a notification of the range of PCI allocated to the hybrid cell, it is determined that there is a HeNB operating in the hybrid access mode in the neighboring cell, and the process moves to step ST1702. If there is no notification of the range of PCI allocated to the hybrid cell, it is determined that there is no HeNB operating in the hybrid access mode in the neighboring cells, and the mobile terminal makes a transition to step ST6202.

In step ST1702, the mobile terminal performs a cell search using the PCI included in the PCI range allocated to the hybrid cell, which is the “peripheral hybrid status” notified from the base station. In Step ST1703, the mobile terminal performs a cell search using the PCI belonging to the PCI range for the non-CSG cell using the PCI split information.

An example of the operation as a mobile terminal when a further specific example (5) of the surrounding hybrid situation in the present embodiment is applied will be described with reference to FIG. The same reference numerals as those in FIG. 15 and FIG.

In step ST1701, the mobile terminal determines whether there is a HeNB operating in the hybrid access mode in the neighboring cell (or in the measurement target cell). For this determination, the PCI range assigned to the hybrid cells existing in the vicinity, which is the “peripheral hybrid status” notified from the base station, can be used. If there is a notification of the range of PCI allocated to a hybrid cell existing in the vicinity, it is determined that there is a HeNB operating in the hybrid access mode in the neighboring cell, and the process moves to step ST1702. If there is no notification of the range of PCI allocated to the hybrid cells existing in the vicinity, it is determined that there is no HeNB operating in the hybrid access mode in the neighboring cells, and the mobile terminal makes a transition to step ST6202.

In step ST1702, the mobile terminal performs a cell search using the PCI included in the PCI range allocated to the hybrid cell existing in the vicinity, which is the “peripheral hybrid status” notified from the base station. In Step ST1703, the mobile terminal performs a cell search using the PCI belonging to the PCI range for the non-CSG cell using the PCI split information.

According to the third embodiment, the following effects can be obtained in addition to the effects of the second embodiment, similarly to the first modification of the second embodiment. It is possible to increase the cell search speed of a mobile terminal that does not have a white list. In an environment where a mobile terminal that does not have a white list does not have a HeNB operated in the hybrid access mode, it is not necessary to search using a PCI that belongs to the PCI range for the CSG cell. This can provide an effect that the search operation can be executed at high speed. This can obtain the effect of preventing the control delay of the mobile communication system. In addition, an effect of reducing power consumption of the mobile terminal can be obtained.
Assuming future CSG cell placement, this is an important effect.

Furthermore, as an operation as a mobile terminal in the case where further specific examples (3), (4), and (5) of the surrounding hybrid situation in the present embodiment are applied, the modification 1 of the second embodiment and the present embodiment The following effects can be obtained as compared with the case where the further specific example (1) or (2) of the peripheral hybrid situation is applied. A mobile terminal not registered with CSG can simplify processing in a cell search for detecting a macro cell and a hybrid cell, which are cells corresponding to the open access mode. A mobile terminal not registered with CSG can perform cell search using PCI belonging to the PCI range for non-CSG cells and PCI belonging to the PCI range for hybrid cells in order to detect cells corresponding to the open access mode. It becomes. Alternatively, a mobile terminal not registered with CSG performs a cell search with PCI belonging to the PCI range for non-CSG cell and PCI for hybrid cell existing in the vicinity in order to detect a cell corresponding to the open access mode. Is possible. That is, a CSG unregistered mobile terminal can detect a cell corresponding to the open access mode without performing a cell search using all PCIs, and with a PCI for CSG cells that are not used for a macro cell and a hybrid cell. Cell search operation can be reduced. Thereby, the effect that a further search operation can be performed at high speed can be acquired. This can obtain the effect of preventing further control delay of the mobile communication system. In addition, the effect of further reducing the power consumption of the mobile terminal can be obtained.

Embodiment 4 FIG.
A problem to be solved in the fourth embodiment will be described. The HeNB and HNB may have a plurality of operation modes. This operation mode may be changed after HeNB and HNB are installed. For example, even when the first modification and the third embodiment of the second embodiment are applied, the access mode of the neighboring HeNB may be changed in the same manner. For example, when the operation mode of the neighboring HeNB operating in the closed access mode is changed to the hybrid access mode, it is necessary to change the “neighboring hybrid status” that the serving cell notifies to the mobile terminals being served thereby.

In the fourth embodiment, a method for changing the “peripheral hybrid status” is disclosed. A method of changing the “peripheral hybrid status” when setting the operation mode via the network is disclosed.

For example, the operator sets the HeNB / HNB operation mode via the network. The operator instructs to change the operation mode setting of the HeNB / HNB via the network. The network side notifies the change of the operation mode setting to the HeNB / HNB. Specific examples of the network side include EPC (Evolved Packet Core), MME, S-GW, and HeNBGW. As another specific example, an O & M (Operating & Management) system, a node, an entity, a function, an element, or the like may be used.
For the notification of the change, an S1 interface or a broadband line may be used.
Further, an O & M interface may be used. The notification of the change of the setting of the operation mode may include an operation mode after the change or an operation mode before and after the change.

The network side notifies the changed “neighboring hybrid status” to a cell that needs to change the “neighboring hybrid status” by changing the operation mode setting of the HeNB / HNB. For the notification of the “peripheral hybrid status”, an S1 interface or a broadband line may be used.

Alternatively, the network side may notify a change request to a cell that needs to change the “neighboring hybrid status” by changing the operation mode setting of the HeNB / HNB.
The cell that has received the “neighboring hybrid status” change request executes the “neighboring hybrid status” change. For the notification of the change request, an S1 interface or a broadband line may be used. The request to change the “peripheral hybrid status” includes the identification information (PCI, GCI, etc.) of the HeNB / HNB whose operation mode setting has been changed, the operation mode after the change, or the operation mode before and after the change. May be.

Possibility of selecting HeNB / HNB whose operation mode setting has been changed as a handover destination or a cell reselection destination as a cell whose "neighboring hybrid status" needs to be changed by changing the operation mode setting of the HeNB / HNB A cell with In addition, when the “neighboring hybrid status” is notified to a mobile terminal being served using NCL, even if a cell that needs to change “NCL” is selected by changing the operation mode setting of the HeNB / HNB good.

Seven specific examples of a cell selection method in which the “neighboring hybrid status” needs to be changed by changing the operation mode setting of the HeNB / HNB are disclosed below.

(1) Use a measurement report of a mobile terminal being served by a HeNB / HNB other than the HeNB / HNB whose operation mode setting has been changed. Two more specific examples are disclosed below.

(1-1) The HeNB / HNB whose operation mode setting has been changed is selected as a handover destination (target cell) in a measurement report of a mobile terminal being served by a HeNB / HNB other than the HeNB / HNB whose operation mode setting has been changed. In this case, it is assumed that the “neighboring hybrid status” needs to be changed by changing the operation mode setting of the HeNB / HNB for the serving cell of the mobile terminal.

(1-2) When a user equipment being served by a HeNB / HNB other than the HeNB / HNB whose operation mode setting has been changed reports that the reception quality of the HeNB / HNB whose operation mode setting has been changed is better than the serving cell, It is assumed that the “neighboring hybrid status” needs to be changed by changing the operation mode setting of the HeNB / HNB for the serving cell of the mobile terminal. According to this specific example, since a measurement report of a mobile terminal being served by a HeNB / HNB other than the HeNB / HNB whose operation mode setting has been changed is used, the HeNB / HNB whose operation mode setting has been changed is used as a handover destination or a cell reselection destination. It is possible to accurately select a cell that may be selected as. That is, it is possible to obtain an effect that a useless cell is not selected as a cell that needs to change the “peripheral hybrid status”.

(2) Use a measurement report of a mobile terminal being served by a HeNB / HNB whose operation mode setting has been changed. Three specific examples are disclosed below.

(2-1) A cell selected by the HeNB / HNB whose operation mode setting has been changed as a handover destination (target cell) using a measurement report of a mobile terminal being served by the change of the operation mode setting of the HeNB / HNB Suppose that it is necessary to change the "peripheral hybrid situation".

(2-2) A mobile terminal being served by a serving cell, that is, a cell reported to have better reception quality than the HeNB / HNB whose operation mode setting has been changed, is changed to a “neighboring hybrid situation by changing the operation mode setting of the HeNB / HNB. Need to be changed.

(2-3) Suppose that the mobile terminal being served by the mobile terminal needs to change the “neighboring hybrid status” by changing the operation mode setting of the HeNB / HNB for a cell in which the reception quality is reported to be better than a certain threshold. A certain threshold value may be determined statically or semi-statically.

Compared to the specific example (1), this specific example (2) eliminates the need to use a measurement report of a mobile terminal being served by a HeNB / HNB other than the HeNB / HNB whose operation mode setting has been changed, and the operation mode setting is The measurement report of the mobile terminal being served by the changed HeNB / HNB may be used, and it is possible to obtain an effect that the processing load on the cell selection method that needs to change the “neighboring hybrid status” is reduced.

(3) Cell position information is used. The network side changes the “peripheral hybrid status” by changing the operation mode setting of the HeNB / HNB for cells installed within a certain distance from the HeNB / HNB whose operation mode setting has been changed from the location information of each cell. Cell that needs to be The certain distance may be determined statically or quasi-statically.
Compared with the specific examples (1) and (2), this specific example eliminates the need to store and process the measurement report, thereby reducing the processing load on the cell selection method that requires the “neighboring hybrid status” to be changed. The effect that it is done can be acquired.

(4) When the HeNB / HNB information other than the HeNB / HNB whose operation mode setting has been changed, or the HeNB / HNB information whose operation mode setting has been changed, is included in the neighboring cell list Suppose that the HeNB / HNB other than the HeNB / HNB whose operation mode setting is changed needs to change the “peripheral hybrid status” by changing the operation mode setting of the HeNB / HNB. According to this specific example, the measurement report is stored and processed as compared with the specific examples (1), (2), and (3), or the comparison with the threshold value or the like is not necessary. It is possible to obtain an effect that the processing load on the cell selection method is reduced.

(5) Neighboring cell information of HeNB / HNB whose operation mode setting has been changed, or a cell included in the neighboring cell list needs to be changed to the “neighboring hybrid situation” by changing the operation mode setting of the HeNB / HNB To do. According to this specific example, the measurement report is stored and processed as compared with the specific examples (1), (2), and (3), or the comparison with the threshold value or the like is not necessary. It is possible to obtain an effect that the processing load on the cell selection method is reduced. In addition, the cell selection method that requires changing the “neighboring hybrid status” in that it is not necessary to consider neighboring cell information other than the HeNB / HNB whose operation mode setting has been changed compared to the specific example (4). The effect that the processing load about is reduced can be obtained.

(6) The “neighboring hybrid status” is changed by changing the operation mode setting of the HeNB / HNB for another cell connected to one or a plurality of MMEs to which the HeNB / HNB whose operation mode setting has been changed is connected It is assumed that the cell is necessary. The overall configuration of an LTE mobile communication system currently under discussion in 3GPP will be described with reference to FIG. Currently, in 3GPP, CSG (Closed Subscriber Group) cells (e-UTRAN Home-eNodeB (Home-eNB, HeNB), UTRAN Home-NB (HNB)) and non-CSG cells (e-UTRAN eNodeB (eNB) ), UTRAN NodeB (NB), GERAN BSS) and the like, and a configuration as shown in FIG. 18 is proposed for e-UTRAN (non-patent literature). 1 Chapter 4.6.1). FIG. 18 will be described.

A mobile terminal (UE) 1801 performs transmission / reception with the base station 1802. Base station 1802 is classified into eNB 1802-1 and Home-eNB 1802-2. The eNB 1802-1 is connected to the MME 1803 via the interface S1, and control information is communicated between the eNB and the MME. A plurality of MMEs 1803 may be connected to one eNB 1802-1. The eNBs are connected by an interface X2, and control information is communicated between the eNBs. The Home-eNB 1802-2 is connected to the MME 1803 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. Alternatively, Home-eNB 1802-2 is connected to MME 1803 via HeNBGW (Home-eNB GateWay) 1804. The Home-eNB and the HeGW are connected via the interface S1, and the HeNBGW 1804 and the MME 1803 are connected via the interface S1. One or a plurality of Home-eNBs 1802-2 are connected to one HeNBGW 1804, and information is communicated through S1. The HeNBGW 1804 is connected to one or a plurality of MMEs 1803, and information is communicated through S1. Furthermore, the following configurations are currently being studied in 3GPP.
Interface X2 between Home-eNB 1802-2 is not supported. From the MME 1803, the HeNBGW 1804 appears as an eNB 1802-1. From the Home-eNB 1802-2, the HeNBGW 1804 appears as an MME 1803. Regardless of whether the Home-eNB 1802-2 is connected to the EPC via the HeNBGW 1804, the interface S1 between the Home-eNB 1802-2 and the EPC is the same. Mobility to or from Home-eNB 1802-2 that spans MME 1803 is not supported. Home-eNB 1802-2 supports only one cell.

According to this specific example, compared to the specific examples (1), (2), (3), (4), and (5), the network side uniquely identifies the “peripheral hybrid” regardless of the HeNB / HNB whose operation mode setting has been changed. Since it becomes possible to select a cell that needs to change the “situation”, it is possible to obtain an effect that the processing load on the selection method of the cell that needs to change the “neighboring hybrid situation” is reduced.

(7) A cell that needs to change the “neighboring hybrid status” by changing the operation mode setting of the HeNB / HNB for another cell connected to the HeNBGW to which the HeNB / HNB whose operation mode setting has been changed is connected And According to this specific example, compared to the specific examples (1), (2), (3), (4), and (5), the network side uniquely identifies the “peripheral hybrid” regardless of the HeNB / HNB whose operation mode setting has been changed. Since it becomes possible to select a cell that needs to change the “situation”, it is possible to obtain an effect that the processing load on the selection method of the cell that needs to change the “neighboring hybrid situation” is reduced.

Next, the operation of the mobile communication system will be described. FIG. 19 shows an example of cell arrangement used in the description. A HeNB / HNB 1909 is installed in the coverage 1902 of the macro cell 1901. The coverage of HeNB / HNB 1909 is 1910. A macro cell 1903 is installed adjacent to the macro cell 1901. The coverage of the macro cell 1903 is 1904. HeNB / HNB 1905 and HeNB / HNB 1907 are installed in the vicinity of the cell boundary between the macro cell 1901 and the macro cell 1903. The coverage of HeNB / HNB 1905 is 1906. The coverage of HeNB / HNB 1907 is 1908.

An example of the operation of the mobile communication system is shown using FIG. In step ST2001, for example, the network receives an instruction to change the operation mode setting of the HeNB from an operator.
If it is necessary to change the PCI along with the operation mode change, the network side may select a PCI suitable for the new operation mode. The PCI suitable for the new operation mode may be a PCI included in the PCI range for the new operation mode. In Step ST2002, the network notifies the HeNB that has received an instruction to change the operation mode setting from the operator of the change in the operation mode setting. The network side may notify the PCI suitable for the new operation mode to the HeNB that has received the instruction to change the operation mode setting. The notified PCI may be the pre-change PCI, the post-change PCI, and the post-change PCI, or the pre-change GCI, the post-change GCI, and the post-change GCI. HeNB which received the instruction | indication of operation mode setting change in step ST2003 performs an operation mode setting change according to an instruction | indication. When the PCI notification suitable for the new operation mode is received in step 4001, the PCI change is executed in accordance with the instruction. Or HeNB which received the instruction | indication of the change of operation mode setting may select PCI suitable for a new operation mode. The PCI suitable for the new operation mode may be a PCI included in the PCI range for the new operation mode. At the time of selection, the HeNB may measure reception quality of neighboring cells. An example of a specific PCI selection method is disclosed. A cell having a good reception quality in the reception quality of neighboring cells (a cell having a high SIR when the reception quality is expressed in SIR) is selected as the same or similar PCI as that cell because it is likely to receive interference. Like that. Similar PCI means PCI having high correlation. There may be one or a plurality of cells with good reception quality. A threshold may be used when determining a cell with good reception quality. For example, if the reception quality is better than a threshold value (when the reception quality is expressed by SIR, the reception quality is higher than the threshold value), the cell may be determined as a cell with good reception quality. The selection of the PCI suitable for the new operation mode may be after the operation mode setting change instruction in step ST4002. The HeNB performs a PCI change. When the HeNB selects a PCI suitable for the new operation mode, the HeNB may notify the PCI to the network side. For this notification, an S1 interface or a broadband line may be used. Further, an O & M interface may be used. The notified PCI may be the pre-change PCI, the post-change PCI, and the post-change PCI, or the pre-change GCI, the post-change GCI, and the post-change GCI.

In Step ST2004, the network selects a cell that needs to change the “neighboring hybrid status”. Or you may select the cell which needs to change NCL.
This will be described with reference to FIG. 19, for example. Consider a case where the operation mode setting of the HeNB / HNB 1905 is changed from the closed access mode to the hybrid access mode. In that case, in step ST2004, for example, the macro cell 1901, the macro cell 1903, and the HeNB / HNB 1907 are selected as cells that need to change the “neighboring hybrid status”. This will be described with reference to FIG. 19, for example. Consider a case where the operation mode setting of the HeNB / HNB 1909 is changed from the closed access mode to the hybrid access mode. In this case, for example, in step ST2004, the macro cell 1901 is selected as a cell that needs to change the “neighboring hybrid status”.

In step ST2005, the network changes the “neighboring hybrid status” of the cell selected in step ST2004. Alternatively, the NCL may be changed. In step ST2006, the network notifies the cell selected in step ST2004 of the “neighboring hybrid status” changed in step ST2005. Alternatively, NCL may be notified. In Step ST2007, the cell that has received the “neighboring hybrid status” notifies the mobile terminal being served thereby of the received “neighboring hybrid status”.

The following effects can be obtained by the fourth embodiment. Even when the operation mode setting is changed after the HeNB and HNB are installed, it is possible to obtain an effect that the “neighboring hybrid status” or “NCL” can be appropriately changed. Further, according to the present embodiment, the operator or the owner of the HeNB / HNB does not need to change the “neighboring hybrid status”. By doing so, it becomes possible to update the “peripheral hybrid status” associated with the operation mode setting change while suppressing the workload and cost generation of the operator or the owner of the HeNB / HNB. Thereby, even when the operation mode setting is changed after HeNB and HNB are installed, it is possible to apply the first and third modifications of the second embodiment, and the first modification of the second embodiment. The effect of the third embodiment can be obtained.

Embodiment 4 Modification 1
Since the problem to be solved in the first modification of the fourth embodiment is the same as that of the fourth embodiment, the description thereof is omitted.

In the first modification of the fourth embodiment, a method for changing the “peripheral hybrid status” when the operation mode is set via the HeNB / HNB is disclosed. For example, the owner of the HeNB / HNB directly instructs to change the operation mode setting of the HeNB / HNB. The HeNB / HNB notifies the change request to the cell that needs to change the “neighboring hybrid status” by changing the operation mode setting. The cell that has received the “neighboring hybrid status” change request executes the “neighboring hybrid status” change. For the notification of the change, an X2 interface or a broadband line may be used. The request to change the “peripheral hybrid status” includes the identification information (PCI, GCI, etc.) of the HeNB / HNB whose operation mode setting has been changed, the operation mode after the change, or the operation mode before and after the change. May be.

Three specific examples of a cell selection method in which the “neighboring hybrid status” needs to be changed by changing the operation mode setting of the HeNB / HNB are disclosed below.

(1) Use measurement results of neighboring cells performed by the HeNB / HNB whose operation mode setting has been changed. It may be necessary to change the “neighboring hybrid status” for a cell whose reception quality is better than a certain threshold value by changing the operation mode setting of the HeNB / HNB. A certain threshold value may be determined statically or semi-statically.

(2-2) A mobile terminal being served thereby reports a cell whose reception quality is better than that of the serving cell, that is, the HeNB / HNB whose operation mode setting has been changed, by changing the operation mode setting of the HeNB / HNB. Suppose the situation needs to be changed.

(2-3) Suppose that the mobile terminal being served by the mobile terminal needs to change the “neighboring hybrid status” by changing the operation mode setting of the HeNB / HNB for a cell reported that the reception quality is better than a certain threshold . A certain threshold value may be determined statically or semi-statically.

This specific example eliminates the need for adding a new function of measuring peripheral cells to the cell, as compared to the specific example (1). Thereby, the effect of avoiding the complexity of the mobile communication system can be obtained.

(3) Neighboring cell information of the HeNB / HNB whose operation mode setting has been changed, or a cell included in the neighboring cell list needs to be changed in the “neighboring hybrid status” by changing the operation mode setting of the HeNB / HNB And According to this specific example, the measurement report is stored and processed as compared with the specific examples (1) and (2), or the comparison with the threshold value or the like is not required, so the selection of the cell that needs to change the “neighboring hybrid status” The effect that the processing load about a method is reduced can be acquired.

Next, the operation of the mobile communication system will be described. FIG. 19 shows an example of cell arrangement used in the description. FIG. 21 shows an example of the operation of the mobile communication system. The cell installation example in FIG. 19 is the same as that in the fourth embodiment, and thus description thereof is omitted. An example of the operation of the mobile communication system is shown using FIG. The same reference numerals as those in FIG. In Step ST2101, the HeNB receives an operation mode setting change instruction from the owner.

In Step ST2102, the HeNB selects a cell that needs to change the “neighboring hybrid status”. Or you may select the cell which needs to change NCL. For example, in FIG. 19, consider a case where the operation mode setting of the HeNB / HNB 1905 is changed from the closed access mode to the hybrid access mode. In that case, in step ST2102, for example, the macro cell 1901, the macro cell 1903, and the HeNB / HNB 1907 are selected as cells that need to change the “neighboring hybrid status”. Further, for example, in FIG. 19, a case where the operation mode setting of the HeNB / HNB 1909 is changed from the closed access mode to the hybrid access mode will be considered. In this case, for example, in step ST2102, the macro cell 1901 is selected as a cell that needs to change the “neighboring hybrid status”.

In step ST2103, the HeNB notifies the cell selected in step ST2102 of a change request for “neighboring hybrid status”. Alternatively, an NCL change request may be notified. HeNB may notify PCI suitable for a new operation mode with respect to the cell selected in step ST4102. The notified PCI may be the pre-change PCI, the post-change PCI, and the post-change PCI, or the pre-change GCI, the post-change GCI, and the post-change GCI. In Step ST2104, the cell that has received the “neighboring hybrid status” change request changes the neighboring hybrid status. Alternatively, the NCL may be changed. In Step ST2105, the cell that has received the “neighboring hybrid status” notifies the mobile terminal being served thereby of the “neighboring hybrid status” changed in Step ST2104.

Modification 1 of Embodiment 4 can be used in combination with Embodiment 4.

In addition to the fourth embodiment, the following effects can be obtained by the first modification of the fourth embodiment.
Even if the operation mode setting of HeNB or HNB that has been performed via HeNB or HNB is changed after the HeNB or HNB is installed, the “peripheral hybrid status” or “NCL” Can be obtained. Further, even if the operation mode setting of the HeNB or HNB is changed via the HeNB or HNB, the operator or the owner of the HeNB / HNB does not need to change the “neighboring hybrid status” according to the present embodiment. By doing so, it is possible to update the “peripheral hybrid status” associated with the operation mode setting change while suppressing the workload and cost generation of the operator or the owner of the HeNB / HNB. Thereby, even if the operation mode setting is changed after the HeNB and HNB are installed even when the operation mode setting of the HeNB and HNB is performed via the HeNB and HNB, the modification of the second embodiment 1 and Embodiment 3 can be applied, and the effects of Modification 1 and Embodiment 3 of Embodiment 2 can be obtained.

Embodiment 4 Modification 2
Since the problem to be solved in the second modification of the fourth embodiment is the same as that of the fourth embodiment and the first modification of the fourth embodiment, description thereof is omitted.

In the second modification of the fourth embodiment, regarding the method of changing the “peripheral hybrid status” when setting the operation mode performed via the HeNB / HNB, a solution different from the first modification of the fourth embodiment is provided. Disclose. For example, the owner of the HeNB / HNB directly instructs to change the operation mode setting of the HeNB / HNB. The HeNB / HNB receives the instruction to change the operation mode setting, and changes the operation mode setting according to the instruction.

The HeNB / HNB notifies the network side of the change of the operation mode setting. An S1 interface or a broadband line may be used for notification of the report. The report may include HeNB / HNB identification information (PCI, GCI, etc.) whose operation mode setting has been changed, an operation mode after the change, or an operation mode before and after the change. Specific examples on the network side include EPC (Evolved packet Core), MME, S-GW, and HeNBGW.

The network side that has received the report notifies the cell that needs to change the “neighboring hybrid status” by changing the operation mode setting of the HeNB / HNB, and notifies the changed “neighboring hybrid status”. For the notification of the change, an S1 interface or a broadband line may be used.

Alternatively, the network side that has received the report may notify a change request to a cell that needs to change the “neighboring hybrid status” by changing the operation mode setting of the HeNB / HNB. The cell that has received the “neighboring hybrid status” change request executes the “neighboring hybrid status” change. For the notification of the change, an S1 interface or a broadband line may be used. The request to change the “peripheral hybrid status” includes the identification information (PCI, GCI, etc.) of the HeNB / HNB whose operation mode setting has been changed, the operation mode after the change, or the operation mode before and after the change. May be.

A specific example of a method for selecting a cell that needs to change the “neighboring hybrid status” by changing the operation mode setting of the HeNB / HNB is the same as that in the fourth embodiment, and a description thereof will be omitted.

Next, the operation of the mobile communication system will be described. FIG. 19 shows an example of cell arrangement used in the description. FIG. 22 shows an example of the operation of the mobile communication system. The same reference numerals as those in FIG. 20 and FIG. In Step ST2201, the HeNB notifies the network side of the report of the operation mode setting change. HeNB may notify PCI suitable for a new operation mode to the network side. The notified PCI may be the pre-change PCI, the post-change PCI, and the post-change PCI, or the pre-change GCI, the post-change GCI, and the post-change GCI.

According to the second modification of the fourth embodiment, the same effect as that of the first modification of the fourth embodiment can be obtained.

In the fourth embodiment, the first modification of the fourth embodiment, and the second modification of the fourth embodiment, the method of changing the “neighboring hybrid situation” when the operation mode of the HeNB / HNB is changed is disclosed. Not only when the operation mode of the HeNB / HNB is changed, but also when a new HeNB / HNB is set, it is necessary to change the “neighboring hybrid status” of the cells in the vicinity of the newly installed location To do. Even in this situation, the fourth embodiment, the first modification of the fourth embodiment, and the second modification of the fourth embodiment are applicable.

In the LTE system, it is considered to support a self-configuration or self-optimization function, and an ANR (Automatic Neighbor Relation) function is being studied (Non-Patent Document 1). The ANR function is a function that allows an operator to handle a relationship (Neighbour Relations (NRs)) with an adjacent cell automatically instead of manually. By performing the process automatically, it is possible to reduce an increase in operator workload and cost.

The method disclosed in the fourth embodiment, the first modification of the fourth embodiment, and the second modification of the fourth embodiment may be incorporated as a part of the ANR function. A method of changing the “peripheral hybrid status” may be incorporated into the ANR function. The ANR function may be provided in the eNB or HeNB / HNB, or may be provided on the network side.

By doing so, it becomes possible to perform the method disclosed in the present embodiment without increasing the workload and cost of the operator or the owner of the HeNB / HNB. The effect of low power consumption can be obtained. Furthermore, even when the number of HeNB / HNBs to be installed in the future increases, it is possible to construct a mobile communication system that supports flexible installation of HeNB / HNBs and changes in operation modes.

In the present invention, although individually described in the first to fourth embodiments, these may be used in combination.

Although 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. Furthermore, it can be applied to a mobile communication system in which CSG (ClosedCloseSubscriber Group) is introduced, and a communication system in which an operator identifies a subscriber and access is permitted to the identified subscriber as in CSG. It is.

The description of the present invention is centered on the case where the HeNB / HNB supports the hybrid access mode. The present invention is also applicable when other entities in the mobile communication system support the hybrid access mode. As a specific example, the present invention can be applied to a case where a cell with a large coverage, for example, a macro cell, or a cell with a small coverage, for example, a micro cell, a pico cell, a femto cell, a hot spot, or a relay, supports the hybrid access mode. It is.

The description of the present invention is centered on the case where the HeNB / HNB supports multiple modes. The present invention is also applicable when other entities in the mobile communication system support multiple modes. As a specific example, the present invention can also be applied when a cell with a large coverage, for example, a macro cell, or a cell with a small coverage, for example, a micro cell, a pico cell, a femto cell, a hot spot, or a relay, supports a plurality of modes. It is.

The mobile communication system according to the present invention is suitable for use in a mobile communication system in which a base station performs wireless communication with a plurality of well terminals because of the effect of reducing power consumption of the mobile terminal.

Claims

A mobile terminal that transmits and receives data using an OFDM (Orthogonal Frequency Division Multiplexing) scheme as a downlink access scheme and an SC-FDMA (Single Career Frequency Division Multiple Access) scheme as an uplink access scheme; A base station provided in a cell for a specific subscriber that is a communication cell that is permitted to be used by a subscriber and a cell for an unspecified user that is a communication cell that can be used by an unspecified mobile terminal or user; and a plurality of base stations The mobile terminal includes a base station controller that manages a desired tracking area where the mobile terminal is located via the base station and performs a paging process on the mobile terminal, and the mobile terminal is assigned to each of the communication cells. And receiving cell identification information (PCI), which is information for identifying the communication cell, from the base station, In a mobile communication system for selecting a cell to be signals,
The specific subscriber cell simultaneously operates a first operation mode for permitting use to a specific mobile terminal or subscriber and a second operation mode for permitting use to an unspecified mobile terminal or user. The cell identification information that can be assigned to the communication cell is classified into a first classification to be assigned to a specific subscriber cell and a second classification to be assigned to an unspecified user cell, and the second operation The mobile communication system, wherein the cell for specific subscribers operating in the mode is assigned cell identification information included in the first classification.
A mobile terminal that transmits and receives data using an OFDM (Orthogonal Frequency Division Multiplexing) scheme as a downlink access scheme and an SC-FDMA (Single Career Frequency Division Multiple Access) scheme as an uplink access scheme; A base station provided in a cell for a specific subscriber that is a communication cell that is permitted to be used by a subscriber and a cell for an unspecified user that is a communication cell that can be used by an unspecified mobile terminal or user; and a plurality of base stations The mobile terminal includes a base station controller that manages a desired tracking area where the mobile terminal is located via the base station and performs a paging process on the mobile terminal, and the mobile terminal is assigned to each of the communication cells. And receiving cell identification information (PCI), which is information for identifying the communication cell, from the base station, In a mobile communication system for selecting a cell to be signals,
The specific subscriber cell includes a first operation mode for permitting use to a specific mobile terminal or subscriber, a second operation mode for permitting use to an unspecified mobile terminal or user, and the first operation mode. Cell identification information that can be operated in a third operation mode that simultaneously processes one operation mode and the second operation mode, and that can be assigned to the communication cell includes a first classification assigned to a cell for a specific subscriber, The cell is classified into the second category assigned to the unspecified user cell, and the cell identification information included in the first category is assigned to the cell for the specific subscriber operating in the third operation mode. A mobile communication system.