JP5013533B2 - Wireless communication terminal apparatus, wireless communication system, and wireless reception method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication terminal device capable of reducing power consumption of a wireless terminal by suppressing increase of overhead of a P-BCH (MIB) as much as possible; a wireless communication base station; a wireless communication mobile management device; and a wireless communication mobile management method. <P>SOLUTION: A mobile wireless communication system is provided with this wireless communication mobile management device (MME) 101, a macro-cell wireless communication base station device (Macro Node B) 102, a Home wireless base station device (Home Node B) 103, and a wireless communication terminal device (UE) 104. The Macro Node B102 and the Home Node B103 manage a macro-cell area and CSG cells, respectively. The respective CSG cells are divided into groups called CSG Groups, and an ID called a CSG Group ID is allocated to each group. The CSG Group is uniquely set in a particular area, for instance, one macro TA or macro cell. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

The present invention, suppressing an increase in overhead in Ha command over the wireless communication terminal apparatus that can reduce power consumption of the wireless communication terminal, a radio communication system and a wireless reception method.

  In recent years, mobile radio communication services have been developed with a wider bandwidth and higher data rates, and multimedia services such as music and video have been realized. In order to realize further high-speed data services, 3GPP, a standardization organization for mobile communication technologies, standardizes mobile communication technologies called LTE (Long Term Evolution) that realize data rates exceeding 100 Mbps, and such high-speed data services. Mobile network configuration and node function expansion (SAE: System Architecture Evolution) have been standardized to support wireless access networks and network IP.

  Now, in the next generation mobile radio communication system, in addition to macro and micro cells, which are large cells currently in operation, areas in small zones of several tens of meters such as homes, offices, and restaurants (Femto cell: Femto cell) Installation of a small cell radio communication base station apparatus that covers (Cell) is considered. Hereinafter, this small cell radio communication base station apparatus is referred to as a home radio communication base station apparatus (Home Node B).

  Currently, in 3GPP, when Home Node B is installed in a home, there is a Close Service Group Cell (hereinafter referred to as CSG cell) that permits access only to limited group members, such as the family in the home. It is being considered.

  Management of access rights and determination of access permission will be described. A unique ID is assigned to each CSG cell, and the femto cell that can be accessed can be identified by storing the ID list of the CSG cell that can be accessed in advance by the radio communication terminal apparatus (UE).

  Further, the UE that is permitted to access is preferentially connected to the CSG cell. That is, as shown in FIG. 40, when the UE 104 enters the coverage area of the CSG cell 103 ′, even if the radio wave from the macro radio communication base station apparatus (Macro Node B) 102 is received, the Home Node is preferentially used. Connect to B103.

3GPP TSG RAN WG2 Document, R2-072829 "Measurement Control on LTE_ACTIVE state for CSG cells" 3GPP TSG RAN WG2 Document, R2-073307 "Measurement of home & private eNBs" 3GPP TSG RAN WG2 Document, R2-073374 "Cell ID Assignment fro Home Node B"

  Non-Patent Document 1 presents a procedure as shown in FIG. 41 as a procedure in which the communicating UE 104 detects such a CSG cell 103 ′ and performs handover from the macro cell 105 to the CSG cell 103 ′.

  First, a radio communication mobility management apparatus (hereinafter referred to as MME) 101 has location information of a CSG cell 103 ′ accessible by each UE 104 in units of a macro tracking area (hereinafter referred to as TA) 106 or a macro cell 105.

  When a UE 104 is handed over to a macro cell 105 in which an accessible CSG cell 103 ′ exists, the MME 101 notifies the destination Macro Node B 102 of the presence of the accessible CSG cell 103 ′ (Indicate the existence of CSG cell: step S601). ).

  When the macro cell 105 and the CSG cell 103 ′ have the same frequency, the Macro Node B 102 that knows the presence of the CSG cell 103 ′ can simultaneously receive a signal from the macro cell 105 and a signal from the CSG cell 103 ′. However, when the macro cell 105 and the CSG cell 103 ′ have different frequencies in order to prevent radio wave interference, in order to detect the CSG cell 103 ′, data communication for performing measurement (reception level measurement) of the CSG cell 103 ′ is performed for a short period of time. During the interval, the Gap to be interrupted is assigned to the UE 104, and the UE 104 performs measurement of the CSG cell 103 ′ having a different frequency during the gap (step S602).

  The Macro Node B 102 requests Gap Measurement from the UE 104 in order to cause the UE 104 to detect System Information called SU-1 (Scheduling Unit 1) including the full ID of the cell (Step S603). Here, SU-1 is broadcasted in a long cycle, and its position is specified by System Information called MIB (Master Information Block) sent in P-BCH (Primary-Broadcast Channel) It takes time to detect SU-1 (step S604).

  When the UE 104 detects the full ID of the CSG cell 103 ′, the UE 104 confirms that the CSG cell 103 ′ is accessible to the UE 104, and sends the full ID to the macro node B 102 in the measurement report. The cell 103 ′ is specified, whether or not the UE 104 can be accessed is confirmed, and a Handover procedure is performed (step S605).

  As described above, in Non-Patent Document 1, in order for Macro Node B 102 to perform CSG cell identification and HO decision, UE needs to perform Gap measurement for a long time and send a plurality of Measurement Reports. This increases signaling and delays. Also, since the UE needs to detect Full ID from SU-1 and perform Long Gap Measurement, it affects users who are performing high-speed packet services. There is also a problem that power consumption increases.

  As described in Non-Patent Document 2, as a means of solving this signal increase and long gap measurement, the full ID is detected following the normal cell search process by sending the full ID by P-BCH. It is possible. However, since Full ID is assumed to be about 50 bits, according to this method, the overhead of P-BCH is greatly increased as described in Non-Patent Document 2. Since P-BCH ensures good reception characteristics even at the cell edge, it is desired to reduce overhead.

  Another solution is to increase the number of SCH IDs (Synchronization channel Identity) as described in Non-Patent Document 3. However, in order to increase the number of SCH IDs, it is necessary to increase the number of SCH sequences, which increases the processing load / processing time of cell search and also affects the already determined macro cell SCH configuration. Become.

  As described above, in the measurement and handover procedure of the CSG cell described in Non-Patent Document 1, signaling increases and a delay occurs. Further, since it is necessary to detect the Full ID broadcasted by SU-1, it is necessary to perform Long Gap Measurement, which has a problem affecting users who are performing high-speed packet services.

The present invention has been made in view of the above points, and a wireless communication terminal capable of suppressing the increase in overhead of P-BCH as described in Non-Patent Documents 2 and 3 as much as possible and reducing the power consumption of the wireless communication terminal device An object is to provide an apparatus, a wireless communication system, and a wireless reception method .

  The wireless communication terminal apparatus of the present invention includes synchronization information receiving means for receiving the synchronization channel identifier of the first base station from the first base station through the synchronization channel, and control for receiving a reception level measurement instruction from the second base station. Signal receiving means, level detecting means for measuring the reception level of a signal transmitted from the first base station, broadcast information receiving means for receiving the first group identifier through a broadcast channel from the first base station, Transmitting means for transmitting a measurement result message including the reception level to the second base station based on the synchronization channel identifier of the first base station and the first group identifier.

According to the above configuration, since the measurement result message including the reception level is transmitted based on the synchronization channel identifier and the first group identifier, the overhead in handover such as Long Gap Measurement and multiple measurement reports is increased as much as possible. And power consumption of the wireless communication terminal device can be reduced.

  In the wireless communication terminal apparatus of the present invention, the control signal receiving unit further receives a list indicating base stations accessible from a second base station, and the transmitting unit includes the synchronization channel identifier and the group identifier. Based on the list, a measurement result message including the reception level is transmitted to the second base station.

  According to the above configuration, since the measurement result message including the reception level is transmitted based on the synchronization channel identifier, the group identifier, and the list, an increase in overhead during handover is suppressed as much as possible, and the power consumption of the wireless communication terminal apparatus is reduced. be able to.

  In the wireless communication terminal device of the present invention, the measurement result message further includes the synchronization channel identifier and the group identifier.

  According to the above configuration, since the measurement result message further includes a synchronization channel identifier and a group identifier, the base station that has received the measurement result message can specify the handover destination base station.

  Also, in the wireless communication terminal apparatus of the present invention, the broadcast information receiving means further receives a second group identifier from the second base station through a broadcast channel, and the transmitting means receives the synchronization channel identifier and the first Based on the group identifier and the second group identifier, a measurement result message including the reception level is transmitted to the second base station.

  According to the above configuration, since the measurement result message including the reception level is transmitted based on the synchronization channel identifier, the first group identifier, and the second group identifier, the overhead from the base station that transmits the first group identifier is reduced. Can be reduced.

  Further, in the wireless communication terminal apparatus of the present invention, the synchronization information receiving means further receives a synchronization channel identifier of the second base station from the second base station through the synchronization channel, and the transmitting means comprises the first Based on the synchronization channel identifier of the base station, the synchronization channel identifier of the second base station, and the first group identifier, a measurement result message including the reception level is transmitted to the second base station.

  According to the above configuration, the measurement result message including the reception level is transmitted based on the synchronization channel identifier of the first base station, the synchronization channel identifier of the second base station, and the first group identifier. An increase in the overhead of broadcast information from the base station can be reduced.

A radio communication system according to the present invention includes the above-described radio communication terminal apparatus, synchronization information transmission means for transmitting a synchronization channel identifier through a synchronization channel, and broadcast information transmission means for transmitting a group identifier through a broadcast channel. a home radio communication base station apparatus identified as the synchronization channel identifier by said group identifier, Ri Tona, the home radio communication base station apparatus, that corresponds to said first base station.

  According to the above configuration, an increase in overhead during handover can be suppressed as much as possible, and power consumption of the wireless communication terminal apparatus can be reduced.

  The radio reception method of the present invention also includes a synchronization information receiving step for receiving the synchronization channel identifier of the first base station from the first base station through the synchronization channel, and a reception level measurement instruction from the second base station. A control signal reception step, a level detection step for measuring a reception level of a signal transmitted from the first base station, a broadcast information reception step for receiving a first group identifier from the first base station through a broadcast channel, Transmitting a measurement result message including the reception level to the second base station based on the synchronization channel identifier of the first base station and the first group identifier.

  According to the above configuration, since the measurement result message including the reception level is transmitted based on the synchronization channel identifier and the first group identifier, the overhead in handover such as Long Gap Measurement and multiple measurement reports is increased as much as possible. And power consumption of the wireless communication terminal device can be reduced.

  According to the present invention, a closed service group cell that can be accessed by a combination of a synchronization channel identifier and a group identifier is specified, so that the number of synchronization channel identifiers is increased or a complete identifier is not detected by Long Gap measurement. An increase in information overhead can be suppressed.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a mobile radio communication system according to Embodiment 1 of the present invention. As shown in FIG. 1, a mobile radio communication system according to Embodiment 1 of the present invention includes a radio communication mobility management apparatus (MME) 101, a macro cell radio communication base station apparatus (Macro Node B) 102, a Home radio base station apparatus. (Home Node B) 103 and radio communication terminal (UE) 104 are provided. Macro Node B 102 manages a macro cell, and Home Node B 103 manages a CSG cell.

  As shown in FIG. 1, each CSG cell is divided into groups called CSG Groups, and IDs called CSG Group IDs are assigned to the groups. The CSG Group is uniquely set in a specific area, for example, one macro TA or macro cell.

  A unique SCH ID (Synchronization channel Identity) is assigned to each CSG cell in each CSG group. As shown in FIG. 2, in LTE currently under consideration in 3GPP, the total number of SCH IDs is 510, and a part of them is assigned as a specific ID for a CSG cell. For the cell search of the CSG cell, the SCH ID of the searched CSG cell can be detected by comparing with the corresponding ID sequence.

  As shown in FIG. 2, CSG cell SCH IDs are allocated across different P-SCHs (Primary-SCHs) as shown in FIG. 2, and SCH IDs belonging to the same P-SCH are allocated as shown in FIG. Can be considered. According to the latter, P-SCH can be specified at the time of cell search for CSG cells, and the processing load at the time of cell search can be reduced.

  The CSG group ID is broadcast from the Home Node B 103 by P-BCH (Primary-Broadcast Channel). UE104 which detected SCH ID by the cell search detects CSG group ID from P-BCH next. FIG. 4 shows the configuration of Home Node B103. In synchronization information transmitting section 111, the synchronization channel ID (SCH ID) is mapped to the synchronization channel and transmitted. In the broadcast information transmitting unit 112, the CSG Group ID is added to the MIB (Master Information Block) together with other broadcast information. The wireless transmission / reception unit 113 transmits the MIB using P-BCH. The Home Node B 103 is connected to another device connected to the network via the network interface unit 114.

  Here, the CSG Group ID will be described. The CSG Group ID does not need to be set uniquely in the PLMN (Personal Land Mobile Network) like the conventional Full ID. In combination with the SCH ID, the CSG Group ID can be set unique in the local area like the same macro TA or macro cell. it can. The reason why the CSG Group ID does not need to be unique within the PLMN is that, for example, the network device such as the MME has a relationship between the CSG cell that each UE can access and the Macro Tracking Area or Macro cell that includes the CSG cell. This is because the measurement (reception level measurement) of the CSG cell performed by the UE under the instruction can be limited to the Macro TA or the Macro cell in which the CSG cell exists.

  Therefore, CSG Group ID can be realized with a small number of bits compared to Full ID, and the overhead of P-BCH can be suppressed as much as possible. For example, if 25 SCH IDs are assigned to CSG cells and the CSG Group ID is 8 bits, more than 5000 unique combinations of CSG cell IDs can be realized in the local area.

  Also, P-BCH overhead can be further reduced by deleting information unnecessary for the CSG cell from the information transmitted on the P-BCH defined in the macro cell and sending the CSG Group ID. Examples of information to be deleted include Downlink System Bandwidth, Signaling of Reference symbol Transmission power, Number of transmission antenna, and MBSFN parameters.

  A series of operations of CSG cell measurement, access availability detection, and measurement report using the ID configuration and ID detection method described above are shown in the flowchart of FIG.

  When the UE is handed over to a new macro TA (or macro cell) (step S101), the MME confirms whether an accessible CSG exists in the macro TA (or macro cell) from information held in advance (step S102).

  When an accessible CSG exists in the macro TA, the MME notifies the presence of an accessible CSG cell to the Macro Node B (step S103). Then, Macro Node B instructs UE to perform Gap Measurement of the CSG cell frequency (step S104).

  Next, when the UE detects a new CSG cell (step S105), it determines whether the SCH ID detected in the cell search process is equal to the SCH ID of an accessible CSG cell stored in advance (step S106).

  When the detected SCH ID is equal to the SCH ID of the accessible CSG cell, the UE determines whether the CSG Group ID in the P-BCH is equal to the CSG Group ID of the accessible CSG cell stored in advance (Step S107). ).

  When the CSG Group ID in the P-BCH is equal to the CSG Group ID of the accessible CSG cell, the UE recognizes it as an accessible CSG cell, and includes the SCH ID and CSG Group ID in the reception level measurement result and displays the Measurement Report as Macro. The data is sent to Node B (step S108).

  Here, ID information held by each device will be described. The UE has the SCH ID and CSG Group ID of an accessible CSG cell. The MME has a relationship between a CSG cell that can be accessed by each UE and a macro TA in which the UE exists (may be a relationship with a macro cell). Macro Node B has the SCH ID and CSG group ID of the peripheral CSG cell ID and the address of Home Node B of the CSG cell, for example, the IP address.

  FIG. 6 shows the configuration of UE 104 that performs CSG cell detection and measurement report according to the flowchart of FIG. The level detection unit 122 detects the reception level of the reference signal and symbol (Reference Symbol) in the reception signal frame, and notifies the determination unit 127 of the detection result.

  The synchronization information receiving unit 123 establishes synchronization using the synchronization channel and detects an ID (SCH ID: Synchronization channel Identity) included in the synchronization channel, and the broadcast information receiving unit 124 detects the CSG group ID. The detection result is notified to the determination unit 127.

  In addition, the control signal receiving unit 125 receives an instruction to perform reception level measurement (Measurement) of a neighboring cell from the base station (Macro Node B), and also a CSG cell list (hereinafter referred to as a White List) that can be accessed by each UE 104. Receive in advance. The received White List is stored in the user data storage unit 128.

  FIG. 7 shows an example of the White List. As shown in FIG. 7, the White List includes a synchronization channel ID (SCH-ID) and CSG Group ID as accessible CSG cell IDs, and may also include a tracking area ID as full ID information. is there.

  The determination unit 127 compares the reference signal reception level with a predetermined threshold, and when it is equal to or higher than the threshold, the detected SCH ID and CSG Group ID of the CSG cell and the accessible CSG stored in the user data storage unit 128 The cell SCH ID and CSG group ID are compared. As a result of the comparison in the determination unit 127, if the two match, the control signal transmission unit 126 generates a measurement result message (Measurement Report), and includes the detected reference signal reception level, SCH ID, CSG Group ID, and wireless The transmission / reception unit 121 notifies the macro node B102.

  FIG. 8 shows a series of the above sequence of CSG cell measurement, accessible CSG cell detection, measurement report, and handover.

  So far, the handover from the macro cell to the CSG cell has been described. However, when accessible CSG cells are adjacent, handover between CSG cells can be realized by the same procedure. FIG. 9 shows a handover procedure between CSG cells (Home Node B).

  Since it is a handover between CSG cells, it is assumed that the frequency is the same, and it is not necessary to perform Gap measurement, but it can be accessed with SCH-ID and CSG group ID as in the case of handover from a macro cell to a CSG cell. A CSG cell is specified and a measurement report is sent (step S121).

  As described above, in Embodiment 1 of the present invention, CSG cells are grouped, and a group ID (CSG Group ID) is a P-BCH (MIB) from each Home Node B that covers the CSG cell. The UE can identify an accessible CSG cell by a combination of the SCH ID that can be detected in the cell search process and the CSG Group ID detected from the P-BCH. This notifies Macro Node B of the measurement results of CSG cells that can be accessed with a single Gap measurement and Measurement Report without increasing the number of SCH IDs or detecting the Full ID sent by SU-1. In addition to reducing signaling, Long Gap measurement necessary for full ID detection in SU-1 can be avoided.

(Embodiment 2)
Next, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 10 shows Handover Procedure according to Embodiment 2 of the present invention.

  In the first embodiment, an example has been described in which CSG cell identification is realized in a local area such as Macro TA or Macro cell using SCH ID and CSG group ID. In this case, a very large number of CSG cells are expected to be installed, and the CSG cell ID (SCH ID + CSG Group ID) may overlap between different CSG cells.

  In Embodiment 2, when the combination of the SCH ID for identifying the CSG cell and the CSG Group ID overlaps between different CSG Cells, during the Handover Preparation period, the MME or the destination Home Node B (Target Home Node In B), a procedure for determining whether access is possible using the full ID, reducing unnecessary signaling after handover preparation, and avoiding unauthorized access to the CSG cell by a UE without access authority will be described.

  The sequence in FIG. 10 will be described. In FIG. 10, the sequence until the UE transmits a measurement report is the same as that shown in FIG. Macro Node B, which has received a combination of SCH ID and CSG Croup ID in the Measurement Report, identifies multiple CSG cells as candidate Handover destinations because the ID combination overlaps with two or more CSG cells. Then, (1) Handover Request for one of the CSG cells is sent to the MME.

  The Handover Request includes a TMSI (Temporary Mobile Subscriber Identity) as an ID of the UE, an address (IP address) of a target CSG cell, and “Flag of uncertain identification”. “Flag of uncertain identification” is a flag that indicates that there are multiple CSG cells identified by Macro Node B, and there is no UE in the Target CSG cell to which the Handover Request is sent, and that Handover may fail. is there. That is, “Flag of uncertain identification” is a flag indicating that a combination (cell identifier) of the detected SCH ID and CSG Croup ID is used in a plurality of Home Node Bs.

  Handover Request to Home Node B managing the CSG cell is not sent directly between Macro Node B and Home Node B, and between Home Node B and Macro Node B. Sent by.

  The MME that has received the Handover Request grasps the CSG cell that can be accessed from the included UE ID, and also identifies and collates the CSG cell from the address of the Target CSG cell. As a result of the collation, if it is determined that the UE that has requested Handover does not have access authority to the target CSG cell, (2) a Handover NACK signal is sent back to the Source Macro Node B.

  Macro Node B that has received the Handover NACK sends (3) Handover Request again to other CSG cell candidates. As shown in FIG. 11, the Handover Request is repeatedly sent until a Handover ACK is sent back from the accessible CSG cell (step S211).

  Further, in FIG. 10, the MME determines whether or not the UE can access the CSG cell, but it can also be performed at the Home Node B of the Target. FIG. 12 shows a sequence for determining whether or not the UE can be accessed by the Target Home Node B and returning a Handover NACK from the Target Home Node B if the UE cannot access.

  Each Home Node B holds ID (IMSI: International Mobile Subscriber Identity) as accessible UE information, and judges whether or not access is possible by IMSI. Since the TMSI is included in the Handover Request from the Source Macro Node B, the MME retrieves the IMSI from the TMSI and sends it to the Target Home Node B included in the Handover Request command.

  As described above, CSG cells that are in the coverage of CSG cells that cannot be accessed by the UE, and CSG cell IDs overlap, so that Source Macro Node B cannot be accessed from Handover candidates of multiple CSG cells with the same CSG cell ID Explained the procedure rejected when a Handover Request is sent to.

  On the other hand, as another scenario when the IDs of CSG cells overlap, a case will be described in which a Handover Request is sent to Home Node B that is not in a CSG cell accessible by the UE but accessible by Source Macro Node B. FIG. 13 shows a sequence diagram.

  Upon receiving the measurement report, Macro Node B sends a Handover Request to the CSG cell candidate. Among these, when sent to Home Node B of an accessible CSG cell, if it is determined that Target Home Node B is accessible from the UE ID, information for accessing Target Home Node (New RNTI: Radio (3) Handover ACK is returned to Macro Node B including Network Temporary ID and access parameters.

  Here, Target Home Node B recognizes from the “Flag of uncertain identification” included in the Handover Request that the UE may be in another CSG cell coverage and may not be accessed. In order to manage, a timer (T1) is started (step S241).

  On the other hand, the Source Macro Node B that has received the Handover ACK notifies the UE of (4) Handover Command including the access information. The Target Home Node B that has started the T1 timer sends (5) Handover Fail signal to the Source Macro Node B when the UE does not access within the specified time and the timer ends.

  Macro Node B that receives the Handover fail signal recognizes that the UE is not in the coverage of the CSG cell that the UE can access from the Handover fail signal, and starts re-establishing access with the UE that failed to access the CSG cell To do.

  In addition, Macro Node B does not immediately perform data forwarding of the downlink data accumulated in Buffer to Target Home Node B by notifying the UE of the Handover Command, but the UE completes the access and sends the Resource via the MME. Performed after a Release Request is notified.

  FIGS. 14 and 15 show configurations of the Macro Node B 102 and the Home Node B 103 according to the second embodiment, respectively. In Macro Node B102, when the measurement report sent from the UE is received by the control signal receiving unit 203, the neighboring cell information stored in the database 201 is obtained from the SCH ID and CSG group ID of the CSG cell included in the Measurement Report. By using the neighboring cell detection unit 202, the handover destination CSG cell is searched and specified.

  When there are a plurality of CSG cells corresponding to the combination of the SCH ID and the CSG Group ID as a result of searching by the neighboring cell detection unit 202, the control signal transmission unit 204 generates “flag of uncertain identification” and includes it in the Handover Request. The handover destination CSG cell is notified via the network interface unit 206.

  On the other hand, the Home Node B 103 manages accessible UE information together with SCH IDs and CSG group IDs of neighboring CSG cells and SCH ID information of macro cells in the database 211. The access determination unit 212 compares the UE ID included in the Handover Request received by the control information reception unit 216 with the access UE information stored in the database 211 to determine whether access is possible. Then, the control signal transmission unit 217 generates a Handover ACK or a Handover NACK and sends it back to the Source Macro Node B via the network interface unit 219.

  In addition, when “flag of uncertain identification” is included in the Handover Request, when it is determined that access is possible as a result of collation with the access UE information, a Handover Command is returned to the Source Macro Node B and the timer management unit In step 213, the timer T1 is operated to monitor UE access for a certain period. When there is no access from the UE and the timer T1 expires, the Home Node B 103 generates a Handover Fail message in the control signal transmission unit 217 and notifies the Source Macro Node B via the network interface unit 219.

  Further, the Home Node B 103 adds a CSG Group ID to the MIB (Master Information Block) generated by the control signal transmission unit 217 and broadcasts it via the wireless transmission / reception unit 218 using P-BCH (Primary Broadcast Channel).

  Next, FIG. 16 shows the configuration of the MME 101. When the MME 101 receives the Handover Request at the control information receiving unit 223, the MME 101 determines that the request is a request to the CSG cell from the destination address, and the UE ID included in the Handover Request and each CSG cell stored in the database 221. The access determination unit 222 collates the accessible UE list and sends a Handover Request to the Home Node B of the Request destination via the interface unit 225 if they match. On the other hand, if they do not match, the MME 101 notifies the Target Macro Node B of Handover NACK.

  When entrusting access to the CSG cell to Target Home Node B, the MME 101 obtains a permanent ID (IMSI: International Mobile Subscriber Identity) from a temporary ID (TMSI: Temporary Mobile Subscriber Identity) included in the Handover Request. Determine and add to Handover Request and send to Target Home Node B.

  As described above, in the second embodiment of the present invention, the combination of SCH ID and CSG Group ID for identifying CSG cells overlaps between different CSG cells in a region where a large number of CSG cells are dense. In the Handover Preparation period, the MME or the destination Home Node B (Target Home Node B) uses the Full ID assigned to the CSG cell and the access authority information of each UE to determine whether the UE can be accessed. This makes it possible to reduce useless signaling and to avoid access to a CSG cell without access authority.

  In addition, Macro Node B that has received the Measurement Report sends a Handover Request to Target Home Node B, including a flag indicating that the CSG cell is not uniquely identified, and Home Node B monitors the UE access. In addition, it is possible to detect a Handover Failure that occurs when other CSG cell coverages having the same ID combination exist at an early stage and to prompt the return to the original Macro Node B.

(Embodiment 3)
Next, Embodiment 3 of the present invention will be described in detail with reference to the drawings. FIG. 17 is a diagram showing the configuration of the mobile radio communication system according to Embodiment 3 of the present invention. The third embodiment of the present invention is different from the first embodiment in that the CSG group ID added to the CSG cell MIB (P-BCH) is divided into two parts. With this configuration, the overhead of P-BCH (MIB) broadcast from the CSG cell can be reduced.

  As shown in FIG. 18, one of the two CSG group IDs is a macro cell-specific CSG group ID part (CSG Group ID1), and the other is a CSG Group ID part that identifies a group in the same Macro cell. (CSG Group ID2). Of the two divided parts, CSG Group ID1 is broadcast from Macro Node B as System Information of each Macro cell, and CSG Group ID2 is Home Node B in (MIB) P-BCH as System Information of the CSG cell. Will be informed.

  FIG. 19 shows a handover procedure from Macro Node B (Macro cell) to Home Node B (CSG cell) in the third embodiment. The UE receives CSG Group ID1 from the connected Macro Node B as broadcast information, and detects CSG Group ID2 from the SCH ID and P-BCH in the cell search of the CSG cell, and determines that it is an accessible CSG cell. Then, a measurement report is sent to Macro Node B by adding the detected ID to the reception level detection result, and Handover is started (step S301).

  FIG. 20 shows a flowchart of a series of operations of Measurement and Measurement Report of an accessible CSG cell.

  When the UE is handed over to a new macro cell (step S311), the MME confirms whether an accessible CSG exists in the macro TA (or macro cell) from information held in advance (step S312). If an accessible CSG exists in the macro TA, the MME notifies the presence of an accessible CSG cell to the Macro Node B (step S313).

  Next, the UE detects CSG Group ID1 from the broadcast information of Macro Node B (step S314). Then, Macro Node B instructs UE to perform Gap Measurement of the CSG cell frequency (step S315).

  Next, when the UE detects a new CSG cell (step S316), the UE determines whether the SCH ID detected in the cell search process is equal to the SCH ID of an accessible CSG cell stored in advance (step S317).

  When the detected SCH ID is equal to the SCH ID of an accessible CSG cell, the UE detects CSG Group ID2 in the P-BCH, and combines with the already detected CSG Group ID1 to allow access stored in advance. It is determined whether it is equal to the CSG Group ID of the CSG cell (step S318).

  If CSG Group ID1 is equal to the CSG Group ID of the accessible CSG cell, the UE recognizes it as an accessible CSG cell, includes the SCH ID and CSG Group ID in the reception level measurement result, and sends the Measurement Report to Macro Node B. Send (step S319).

  The configuration of the UE in the third embodiment is the same as the configuration in the first embodiment shown in FIG. 6, and the level detection unit 122 detects the reception level of the reference signal and symbol (Reference symbol) in the received signal frame, The detection result is notified to the determination unit 127.

  The synchronization information receiving unit 123 detects the SCH ID, and the control signal receiving unit 125 detects CSG Group ID1 from the broadcast information of the macro cell and CSG group ID2 from the P-BCH of the CSG cell, The determination unit 127 is notified of the result.

  The determination unit 127 compares the reference signal reception level with a predetermined threshold, and stores the detected SCH ID and CSG Group ID (CSG Group ID1 and CSG Group ID2) and the user data storage unit 128 when the received level is equal to or higher than the threshold. Compare the SCH ID and CSG group ID of the accessible CSG cell. As a result of the comparison in the determination unit 127, if the two match, the control signal generation unit 126 generates a measurement result message (Measurement Report), and includes the detected reference signal reception level, SCH ID, and CSG Group ID. The transmission / reception unit 121 notifies Macro Node B.

  In addition, the configurations of Macro Node B and Home Node B in Embodiment 3 are the same as the configurations of Embodiment 1 shown in FIG. 4, and in addition to the functions of Embodiment 1, Macro Node B 102 has CSG Group It has a function of generating and transmitting ID1 as broadcast information (System Information Brock) by the broadcast information transmission unit.

  On the other hand, Home Node B 103 in Embodiment 3 broadcasts all CSG Group IDs in P-BCH in Embodiment 1, but broadcasts only divided CSG Group ID 2 in MIB (P-BCH). To do.

  In addition, in the CSG cell existing at the boundary of the macro cell, when moving from one macro cell to the CSG cell, the CSG group ID1 of the accessible CSG cell stored in advance in the UE from the macro cell is broadcast, but from the other Since different Group ID1 is notified, the phenomenon that it cannot access occurs.

  In order to solve this, as shown in FIG. 21, a plurality of CSG groups are assigned to CSG cells existing at the boundary of the macro cell so as to have a plurality of CSG Group IDs. This makes it possible to detect the ID (SCH ID + CSG Group ID) of an accessible CSG cell and perform a Handover Procedure regardless of whether it has moved from any neighboring macro cell.

  Further, in FIG. 19, the broadcast information from Macro Node B is used as a method for notifying the UE of CSG Group ID1, but using Measurement Command as shown in FIG. 22 and Handover Command as shown in FIG. It is also possible to notify.

  As described above, in Embodiment 3 of the present invention, the CSG group ID added to the MIB (P-BCH) of the CSG cell is divided into two, and the CSG group ID 1 unique to one Macro cell is the Macro. The CSG Group ID2 for notifying the UE as the cell broadcast information and identifying the other macro cell group is notified to the UE by the MIB (P-BCH) of the CSG cell. Furthermore, the overhead of the P-BCH (MIB) of the CSG cell can be reduced.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings. In the fourth embodiment of the present invention, among the CSG group IDs, the macro cell-specific partial CSG Group ID 1 shown in the third embodiment is set as the SCH ID assigned to each macro cell, and in the process of macro cell search, the CSG Cell An example of detecting Group ID1 (macro cell SCH ID) will be described.

  FIG. 24 is a flowchart showing a series of operations of CSG cell measurement, ID detection, and measurement report. Note that the SCH ID of the macro cell is set to be unique within the macro TA, thereby preventing overlap of the CSG Cell ID 1 within the macro TA.

  When the UE performs a cell search for a new macro cell and detects a SCH ID (CSG Group ID1) (step S401), the UE hands over to a new macro TA (or macro cell) (step S402). Then, the MME confirms whether there is an accessible CSG in the macro TA (or macro cell) from the information held in advance (step S403).

  When an accessible CSG exists in the macro TA, the MME notifies the presence of an accessible CSG cell to the Macro Node B (step S404). Then, the Macro Node B instructs the UE to perform Gap Measurement on the CSG cell frequency (Step S405).

  Next, when the UE detects a new CSG cell (step S406), it determines whether the SCH ID detected in the cell search process is equal to the SCH ID of an accessible CSG cell stored in advance (step S407).

  When the detected SCH ID is equal to the SCH ID of the accessible CSG cell, the UE detects CSG Group ID2 in the P-BCH, and combines with the already detected CSG Group ID1 to allow access stored in advance. It is determined whether it is equal to the CSG Group ID of the CSG cell (step S408).

  Then, if CSG Group ID1 is equal to the CSG Group ID of the accessible CSG cell, the UE recognizes it as an accessible CSG cell, includes the SCH ID and CSG Group ID in the reception level detection result, and sends the Measurement Report to Macro Node B. Send (step S409).

  As described above, in the fourth embodiment of the present invention, the CSG Group ID 1 defined in the third embodiment is used as the SCH ID of the macro cell, so that new information is added to the broadcast information, Measurement Configuration Command, and Handover Command of each macro cell. CSG Group ID1 can be detected and a series of handover operations to the CSG cell can be performed without adding CSG Group ID1.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings. In the fifth embodiment of the present invention, by determining the system for the CSG cell identifier, SCH ID, CSG Group ID, and Full ID described so far in the first to fourth embodiments, the ID in the network and UE An example of simplifying management will be described.

  Each UE needs to have a SCH ID, CSG Group ID, and Full ID as information of a CSG cell that can be accessed in advance in order to access the CSG cell. In the CSG cell, since a unique TA ID (Tracking Area ID) is assigned to each cell, this is a full ID.

  FIG. 25 shows the ID configuration of the CSG cell in the fifth embodiment in comparison with that of the macro cell. As shown in FIG. 25, in the CSG cell, since a unique TA ID is assigned to each CSG cell in the world, it is necessary to assign more bits to the TA ID than in the macro cell.

  For example, when the total of TA ID and Cell ID given to one cell is 44 bits, in the CSG cell, the X bit is assigned to the TA ID, and the remaining 44-X bits are assigned to the CSG Group ID. In this way, a unique TA ID is assigned to the CSG cell, and the cell can be identified by the TA ID, so there is no need to provide a Cell ID as in a macro cell.

  Further, as shown in FIG. 25, the lower bits of TA ID are SCH-ID. For example, if the number of SCH IDs is 510, the lower 9 bits of TA ID are SCH IDs. That is, the total ID information of the CSG cell is composed of TA ID (Full ID), CSG Group ID, and SCH ID (low order bits of Full ID). Total ID information is set so that the CSG Group ID is unique in the local area such as Macro TA and Macro Cell when Home Node B is set up, and the SCH-ID is unique within the same CSG Group. A corresponding TA ID is allocated. This ID information is managed by the MME.

  For the CSG cells that can be accessed, the series of IDs shown in FIG. 25 is notified from the MME as a CSG access list to the UE using a signal such as Tracking Area Update, as shown in FIG. 26, and stored in the memory in the UE. Is done. When the ID of the CSG cell is changed due to network expansion or laying of a new CSG cell, the memory information of the UE is updated by notification from the MME.

  As described above, the identifier of the CSG cell, SCH ID, CSG Group ID, and TA ID (Full ID) are set at the time of Home Node B setup with association, and the MME manages to notify the UE, The update can be easily performed using an existing signal such as an existing Tracking Area Update signal.

(Embodiment 6)
In Embodiments 1 to 5 described so far, the access right of an accessible CSG cell is determined based on the CSG cell identifier, SCH ID, and CSG Group ID. However, in Embodiment 6 of the present invention, P-BCH The CSG bit (1 bit) for identifying the CSG cell broadcasted in step 1 and the MME are used to check the access rights of each UE and identify the cell to which each UE is connected, and the network performs handover. What specifies the previous CSG cell will be described.

FIG. 27 shows a CSG cell access right confirmation and handover control method according to the sixth embodiment. The configurations of Macro Node B, Home Node B, and MME in Embodiment 6 are shown in FIGS. 28, 29, and 30, respectively. The UE configuration is the same as in Embodiment 1 (FIG. 6).
Hereinafter, the operations of the UE, Macro Node B, Home Node B, and MME will be described with reference to these drawings.

  The terminal (UE) performs a cell search of the CSG cell, and if the level detected by the level detection unit 122 is equal to or greater than the threshold, the SCH ID (Physical ID) detected from the synchronization channel by the synchronization signal reception unit 124 is included. The Measurement Report signal is generated by the control signal transmission unit 126 and transmitted to the Macro Node B (FIG. 27: S701).

  Next, after receiving the measurement report by the control signal receiving unit 203, the macro node B, the control processing unit 207 determines that the handover target cell is a CSG cell from the SCH ID (Physical ID) included in the measurement report. Recognize that it exists (S702). Here, Macro Node B holds the SCH ID of the CSG cell overlaid in its own cell coverage as peripheral CSG cell information, or determines the SCH ID group assigned to the CSG cell in advance. Macro Node B determines from the SCH ID that the target cell is a CSG cell. Since the SCH ID can be detected by holding the SCH ID of the CSG cell that can be accessed by each terminal, the CSG cell may be notified when the Measurement Report is sent (S701).

  The control processing unit 207 of Macro Node B, which has recognized that it is a CSG cell, generates an access right confirmation request signal “Access right Confirmation request” for the MME (MME / S-GW), and the Global ID ( TMSI (Temporary Mobile Subscriber Identity) is transmitted to the MME via the control signal transmission unit 204 and the network interface unit 206 (S703).

  When the MME receives the access right confirmation request signal, the control processing unit 226 and the access determination unit 222 identify an accessible CSG cell (Home Node B) existing in the coverage area of the Macro Node B for the UE. (S704). Then, the control processing unit 226 of the MME notifies the specified Home Node B of each CSG bit (1 bit) broadcasted by the P-BCH to notify that each Home Node B is a CSG Cell. A request signal (CSG bit temporary change request) for temporarily inverting is generated and transmitted to the Home Node B via the control signal transmission unit 224 and the interface unit 225 (S705). Here, FIG. 31 shows an example of information broadcast on the P-BCH. However, the CSG Group ID used in Embodiments 1 to 5 is excluded here. As shown in FIG. 31, the CSG bit is broadcast from each Home Node B on P-BCH, for example, together with physical parameter information such as bandwidth and scheduling information of other System information. In S704 of FIG. 27, if there is no CSG cell that can be accessed by the UE in the coverage of the Macro Node B, the MME notifies the Macro Node B to that effect and performs the procedure for handover. Is terminated.

  Next, when Home Node B receives a CSG bit temporary change request, the control processing unit 501 inverts the CSG bit in the P-BCH, for example, to indicate that it is a CSG cell, the normal CSG bit is set. If it is set to 1, it is changed to 0, and the broadcast information transmitter 502 puts it on a predetermined P-BCH and broadcasts it from the radio transceiver 505 to the UE (S708).

  On the other hand, the MME transmits a CSG bit confirmation request signal (CSG bit confirmation request) to Macro Node B that has transmitted the access right confirmation request signal (S706). The Macro Node B that has received the request signal generates a Measurement Command in the control processing unit 207, and instructs the UE to perform CSG cell layer measurement again, and to detect and report the CSG bit (S707). ).

  Upon receiving the Measurement Command (S707), the UE performs measurement of the CSG cell again, receives the P-BCH, and detects the CSG bit in the broadcast information receiving unit 124. And UE produces | generates Measurement Report including the detection result in the control signal transmission part 126, and transmits to Macro Node B (S709).

  If the CSG bit detection result is reversed (1 normal to 0 abnormal), Macro Node B determines that the UE is under a CSG cell that can be accessed by the UE, and controls the HO Request signal including the CSG bit confirmation result. The data is generated by the unit 207 and transmitted to the MME (S710). Even when the node is not inverted, Macro Node B generates a Confirmation Response signal indicating the confirmation result, notifies the MME, and the Handover procedure is terminated.

  The MME that has received the HO request signal including the confirmation result officially forwards the HO Request to the Home eNB that is the handover target (S711), and the Handover Procedure is performed (S712 to S714). Furthermore, when the MME forwards the HO request, the control processing unit 226 generates a request signal (CSG bit normal operation request) for returning the inverted CSG bit to the original, and notifies the Home Node B together ( S711).

  As described above, in Embodiment 6 of the present invention, when the SCH ID (Physical ID) indicating the CSG cell is included in the Measurement Report sent from the UE, the MME holds it in advance. The CSG cell that can be accessed by the UE is identified from the access list of each CSG cell, and the CSG bit broadcasted by the Home Node B that manages the CSG cell using the P-BCH is inverted, and the UE is again measured. By confirming the reversal of the CSG bit, the access right of the UE to the CSG cell and the location of the UE can be confirmed, and handover can be performed. In addition, according to the present embodiment, it is not necessary to perform long gap measurement, which is a problem of the prior art, so that a reduction in throughput can be prevented. Also, according to the present embodiment, since the handover to the CSG cell can be performed using the existing CSG bit broadcasted by P-BCH, the CSG group ID is broadcasted by P-BCH. The overhead of P-BCH can be reduced as compared with the first to fifth embodiments. Furthermore, this embodiment has an advantage that it is not necessary to maintain a list of CSG cell SCH IDs (Physical IDs) and CSG Group IDs that can be accessed in advance by the UE.

  According to the present embodiment, as shown in FIG. 32, when the same SCH ID (Physical ID) is used in a plurality of CSG cells (Home Node B) within the coverage of the same Macro Node B Is also effective. That is, according to the present embodiment, the MME specifies the CSG cell that can be accessed by each UE, and instructs the CSG bit inversion only to Home Node B that manages the specified CSG cell. Even when SCH ID (Physical ID) is used, confirmation of access right and identification of a CSG cell in which a UE exists can be performed, and handover can be performed.

(Embodiment 7)
In the seventh embodiment of the present invention, the same SCH ID (Physical ID) is used in a plurality of CSG cells in the same Macro Node B coverage in the access CSG cell confirmation method and handover described in the sixth embodiment. In the case of being used, confirmation of access right and handover are realized when a plurality of different UEs simultaneously transmit a measurement report including the SCH ID of the CSG cell to Macro Node B.

  First, in multiple CSG cells within the same Macro Node B coverage, when the same SCH ID (Physical ID is used), multiple different UEs sent measurement reports for accessing the same CSG cell at the same time. The problem in this case will be briefly described with reference to Fig. 33 and Fig. 34. As shown in Fig. 33, when the SCH IDs of two CSG cells cause Collision, In this case, even if the CSG accessible to each UE is different, the CSG bit of either one of the CSG cells is inverted as shown in Embodiment 6. In addition, by detecting the CSG bit of each UE, the position of each UE can be specified, and thus the access right of each UE can be determined.

  On the other hand, as shown in FIG. 34, when SCH ID Collision is caused by three or more CSG cells, the position of two UEs can be specified simultaneously only by inverting the CSG bit of one of the CSG cells. I can't. Further, when the CSG bits of the CSG cells accessible by each UE are reversed at the same time, as shown in FIG. 34, erroneous detection occurs when the UEs exist in CSG cells accessible to each other. As a method for avoiding erroneous detection, it is conceivable to perform location specification of each UE and confirmation of access right by inverting CSG bits of each accessible CSG cell in order. However, in this method, there is a delay until the confirmation of all UEs is completed, and there is a high possibility that a radio link disconnection occurs in a UE having a poor reception environment from the Macro cell. Furthermore, signaling associated with inversion / forward rotation of CSG bit increases.

  For such a problem, in Embodiment 7, Macro Node B requested the MME to confirm the access right of each UE, the type of downlink data being executed by each UE, and the priority. Depending on, the confirmation method of the access right for each UE is selected. With this configuration, it is possible to increase the number of UEs that can be processed simultaneously, thereby reducing the processing load and processing time.

  FIG. 35 shows a CSG cell access right confirmation and handover control sequence in the seventh embodiment. The configurations of Macro Node B, Home Node B, MME, and UE in the seventh embodiment are the same as those in the sixth embodiment. The operation of UE, Macro Node B, Home Node B, and MME will be described below with reference to these drawings.

  When a plurality of different UEs simultaneously send a measurement report for performing a handover to a CSG cell in which a SCH ID (Physical ID) Collision has occurred (S801), the Macro Node B responds to the MME. Then, a Collision resolution request signal is sent (S802). This request signal includes the IDs (TMSI) of all UEs that have transmitted Measurement Reports regarding CSG cells having the same Physical ID. The MME that has received the request signal uses the control processing unit 226 and the access determination unit 222 to specify an accessible CSG cell (Home eNB) existing in the coverage area of the Macro Node B for the plurality of UEs (S803). Then, the control processing unit 226 generates a signal (Access right information Response) shown as a result thereof and returns it to the Macro Node B (S804).

  Here, a selection method of the access right confirmation method of Macro Node B to which the access right information is returned will be described with reference to FIG. First, the Macro Node B obtains access right information from the MME (S1001), determines whether “a plurality of UEs that can access the same CSG cell” (S1002), and if Yes, proceeds to S1003 and simultaneously Since it can be confirmed, it is processed preferentially. Furthermore, when there is a UE receiving High Priority Date such as VoIP in the terminal, access right confirmation and UE location confirmation are performed preferentially by CSG bit inversion (S1004). On the other hand, even if it is not a plurality of UEs that can access the same CSG cell (S1002: No), if the UE receives a High Priority Date such as VoIP (S1005: Yes), the CSG bit inversion is preferentially performed. The access right and the UE location are confirmed (S1004). The UE that does not satisfy the above conditions (S1005: No) uses the Long Gap measurement to detect the TAI (Global ID) included in SU-1, thereby confirming the access right and specifying the location of the UE. (S1006). The process of S1006 is performed in parallel with the CSG bit inversion confirmation of another UE.

  If there is no UE receiving High Priority data, there may be a case where CSG bit inversion confirmation is performed in consideration of the reception level of each UE from Macro Node B. In addition, when there are multiple UEs receiving High Priority data such as VoIP, or multiple groups that can access the same CSG cell, the reception level from each Node's Macro Node B is taken into account. Node B determines the order in which CSG bits are inverted.

  Macro Node B generates a measurement command for requesting Long Gap Measurement by the control processing unit 207 for the UE that has selected access right confirmation by Long Gap Measurement, sends it to the UE, and includes TAI ( Request detection of Global ID. On the other hand, the Macro Node B generates a response signal (Response “the selection of CSG bit method”) for the UE that has selected the confirmation method by CSG bit inversion in the control processing unit 207. And the ID of the UE is transmitted to the MME.

  When the MME receives a CSG bit method selection response signal (Response “the selection of CSG bit method”), according to the procedure shown in Embodiment 6, the UE confirms the access right to the CSG cell, A handover is performed.

  As described above, in Embodiment 7 of the present invention, when the same SCH ID (Physical ID) is used in a plurality of CSG cells in the same Macro Node B coverage, a plurality of different UEs are simultaneously used. When sent to the Measurement Report that includes the SCH ID for accessing the CSG cell, Macro Node B requested the MME to confirm the access rights of each UE and the downtime that each UE is executing. A method for confirming the access right for each UE is selected according to the type and priority of the link data. With this configuration, it is possible to increase the number of UEs that can be processed simultaneously, thereby reducing the processing load and processing time. Further, according to the seventh embodiment, it is possible to reduce the possibility of a decrease in throughput by limiting the cases in which the Long Gap measurement is performed, compared to the conventional technique in which the Long Gap measurement is always performed.

  Note that, according to the present embodiment, as shown in FIG. 37, when a certain UE is executing access right confirmation by CSG Bits inversion for CSG cells using the same SCH ID (Physical ID) In this case, even when another UE transmits a Measurement Report including the SCH ID, the CSG cell that can be accessed by the MME and the confirmation method at the Macro Node B are selected in the same manner.

(Embodiment 8)
In the eighth embodiment of the present invention, when the same SCH ID (Physical ID) is used in a plurality of CSG cells in the same Macro eNB coverage described in the seventh embodiment, a plurality of different UEs simultaneously An example in which a plurality of bits for performing access confirmation / terminal location identification when a measurement report including the same SCH ID (Physical ID) is transmitted will be described. With this configuration, the number of UEs that can be processed simultaneously can be increased.

  FIG. 38 shows a CSG cell access right confirmation and handover control sequence in the eighth embodiment. The configurations of Macro Node B, Home Node B, MME, and UE in the eighth embodiment are the same as those in the sixth and seventh embodiments. The operation of UE, Macro Node B, Home Node B, and MME will be described below with reference to these drawings.

  When a plurality of different UEs transmit a measurement report for simultaneously performing handover to a CSG cell in which a collision of SCH ID (Physical ID) occurs (S901), Macro Node B requests access right confirmation A signal (Access right confirmation request) is generated by the control processing unit 207 and sent to the MME (S902). This request signal includes the ID (TMSI) of each UE that has transmitted a Measurement Report regarding a CSG cell having the same SCH ID (Physical ID). The MME that has received the request signal uses the control processing unit 226 and the access determination unit 222 to specify an accessible CSG cell (Home eNB) that exists in the coverage area of the Macro Node B for the plurality of UEs. When the CSG cells that can be accessed by each UE are different, the MME sets a plurality of bits (hereinafter referred to as L bits) for performing access confirmation and terminal location notification broadcast from each Home Node B to a specified value. The control processing unit 226 generates a request signal for transmission to each Home Node B (S903). Further, the MME notifies the Macro Node B of the L-bits setting value of the CSG Cell that can be accessed by each UE, and instructs each UE to confirm the L bit (S904). That is, in S904, the MME transmits an L bit confirmation request signal “Request to confirm L bits” including the value of the L bit to be confirmed by each UE to the Macro Node B.

  Next, FIG. 39 shows an example of information broadcast on P-BCH including L bits. As shown in FIG. 39, the L bit is broadcast from each Home Node B using P-BCH, for example, together with CSG bit and scheduling information of other System information. The number of L bits is set in consideration of the maximum number of P-BCH transmission bits. The L bit is normally set to an initial value, and is changed to a specified value for a certain period in accordance with a setting request signal from the MME. For example, when the number of bits is 3 bits as shown in FIG. 39, the initial value is 000 and the specified value is set to 101, 111, or the like. The specified value of the L bit may be set including the CSG bit used in the sixth and seventh embodiments.

  The Macro Node B that has received the L bit confirmation request signal from the MME again requests each UE to confirm the L bit reported on the P-BCH as a Measurement Command for instructing Gap measurement. “detection of L bits” is generated by the control processing unit 207 and sent to the UE (S905). Here, since the L bit is broadcast using P-BCH, it is not necessary to provide a Long Gap to detect the L bit, and detection is performed using the Short Gap (S906).

  When each terminal detects the L bit broadcasted by the P-BCH by the broadcast information receiving unit 124 according to the instruction from the Macro Node B, the control signal transmitting unit 126 outputs a measurement report including the L bit detection result. And is transmitted to Macro Node B (S907).

  Macro Node B compares the detection result of the L bit sent in the Measurement Report with the setting value notified from the MME in the control processing unit 207, and if it is the same value, it is under the CSG cell accessible by the UE. Recognizing that it exists (S908). Then, the Macro Node B generates a Handover Request signal in the control processing unit 207 and transmits it to the target Home Node B via the MME. On the other hand, if the detected value of the L bit is different from the notified installation value, it is determined that the UE is in a CSG cell different from the CSG cell accessible by the UE, and the Handover procedure is terminated.

  As described above, in Embodiment 8 of the present invention, when the same SCH ID (Physical ID) is used in a plurality of CSG cells in the same Macro Node B coverage, a plurality of different UEs are simultaneously When transmitting a Measurement Report that includes a Collisioned SCH ID, by using the L bit newly provided in the P-BCH, by confirming the access right / terminal location of each UE, The access right confirmation and the handover process can be performed in parallel, and the load and signaling associated with the process and the processing time can be reduced. In addition, since the L-bit is newly defined and sent by P-BCH, the overhead of P-BCH increases, but it is not necessary to perform Long Gap measurement compared to the conventional technology that always performs Long Gap measurement, thereby avoiding a decrease in throughput. can do. Furthermore, unlike the CSG Group ID shown in Embodiment 1, instead of assigning a fixed ID to each CSG cell, the specified value of the L bit is dynamically changed at the time of Collision resolution, so the CSG Group ID can be fixed. Compared with the case of assignment, the number of bits can be reduced, and the overhead of P-BCH can be reduced.

A home wireless communication base station apparatus according to the present invention is a home wireless communication base station apparatus comprising synchronization information transmitting means for transmitting a synchronization channel identifier through a synchronization channel and broadcast information transmitting means for transmitting a group identifier through a broadcast channel. Thus, the home radio communication base station apparatus is identified by the synchronization channel identifier and the group identifier.

  According to the above configuration, since the home radio communication base station apparatus is identified by the synchronization channel identifier and the group identifier, it is possible to eliminate the need for identification by a full identifier (Full ID).

  The home wireless communication base station apparatus of the present invention includes a storage means for storing a list of terminals that can access the own apparatus, a control information receiving means for receiving a handover request message from another wireless communication base station, And transmitting a message indicating whether or not to allow handover to the other radio communication base station based on the identifier of the radio communication terminal device included in the handover request message and the list.

  According to the above configuration, since a message indicating whether or not to allow handover to another radio communication base station is transmitted based on the identifier and list of the radio communication terminal device included in the handover request message, Access to non-closed service group cells can be avoided and signaling that is wasted after the handover preparation period is reduced.

  Further, the home wireless communication base station apparatus of the present invention sends a connection request from the wireless communication terminal within a predetermined time when a user requesting handover or a wireless communication terminal apparatus is included in the list. Radio control transmission means for transmitting a message indicating handover failure to the radio communication terminal when not received is further provided.

  According to the above configuration, when a connection request is not received within a predetermined time, a message indicating a handover failure is transmitted, so that signaling that is wasted after the handover preparation period can be reduced.

  In the home radio communication base station apparatus of the present invention, the handover request message includes a flag indicating that the same cell identifier is used by a plurality of radio base station apparatuses.

  According to the above configuration, the handover request message includes the flag indicating that the same cell identifier is used in a plurality of radio base station apparatuses, so that a handover failure can be detected early.

  Further, the radio communication base station apparatus of the present invention includes a control signal receiving unit that receives measurement results of neighboring cells from the radio communication terminal apparatus, and a synchronization assigned to the home radio communication base station apparatus in the measurement result message of the neighboring cells. When a channel identifier and a group identifier are included, and there are a plurality of home wireless communication base stations specified by the synchronization channel identifier and the group identifier, a flag indicating use of the same cell ID identifier in a plurality of cells is included. Control signal transmitting means for transmitting a handover request signal to one of the plurality of home wireless communication base stations.

  According to the above configuration, a handover request signal including a flag indicating use of the same cell ID identifier in a plurality of cells is transmitted, so that a handover failure can be detected early.

  In the radio communication base station apparatus of the present invention, the control signal transmission unit further transmits broadcast information including a group identifier.

  According to the above configuration, since the control signal transmission unit transmits the broadcast information including the group identifier, it is possible to reduce overhead in handover.

  Further, the radio communication mobility management device of the present invention includes an acquisition unit that acquires an identifier of a radio communication terminal device and address information of a handover destination radio base station device from a handover request message transmitted from the radio communication base station device. Determining means for determining whether or not the wireless communication terminal apparatus can access the handover destination wireless base station apparatus; and when the determining means determines that access is not possible, a handover rejection message is transmitted to the wireless communication base station Transmitting means for transmitting to the apparatus.

  According to the above configuration, since a handover rejection message is transmitted when it is determined that access is not possible, access to a closed service group cell without access authority can be avoided, and waste after the handover preparation period can be avoided. The signaling that becomes can be reduced.

  The radio transmission method of the present invention is a radio transmission method comprising: a synchronization information transmission step of transmitting a synchronization channel identifier through a synchronization channel; and a broadcast information transmission step of transmitting a group identifier through a broadcast channel, The home radio communication base station apparatus is identified by the synchronization channel identifier and the group identifier.

  According to the above configuration, since the home radio communication base station apparatus is identified by the synchronization channel identifier and the group identifier, it is possible to eliminate the need for identification by a full identifier (Full ID).

  The radio communication mobility management method of the present invention is a radio communication mobility management method in a radio communication system in which a plurality of closed service group cells are grouped and a group identifier is set for each group. The station device notifies the wireless communication terminal device of the group identifier, and specifies a closed service group cell that can be accessed from the combination of the synchronization channel identifier detected by the wireless communication terminal device in the cell search process and the group identifier. And a step of the wireless communication terminal apparatus notifying a wireless communication base station apparatus of a measurement result message related to an accessible closed service group cell.

  According to the above configuration, since a closed service group cell that can be accessed by a combination of a synchronization channel identifier and a group identifier is specified, an increase in overhead is suppressed without increasing the number of synchronization channel identifiers or detecting a full ID. Can do.

  The radio communication mobility management method of the present invention includes a step in which the radio communication terminal apparatus performs handover to the radio communication base station apparatus that manages a macro cell, and a closed service group cell that is accessible by the radio communication mobility management apparatus. The presence of the closed service group cell accessible to the wireless communication base station device, and the wireless communication base station device, Instructing the wireless communication terminal device to measure a closed service group cell frequency, the wireless communication terminal device detecting a closed service group cell by cell search, and the wireless communication terminal device The synchronization channel identifier detected during the search process is stored in advance. Determining whether it is equal to a synchronization channel identifier of an accessible closed service group cell; and whether the group identifier notified by the wireless communication terminal device is equal to a group identifier of an accessible closed service group cell stored in advance And a step of the wireless communication terminal apparatus sending a measurement result message including the synchronization channel identifier and the group identifier to the wireless communication base station apparatus.

  According to the above configuration, the measurement result of the accessible closed service group cell can be notified to the radio communication base station apparatus with a single measurement result message, and in addition to reducing signaling, Long Gap measurement necessary for Full ID detection Can be avoided.

  Further, the radio communication mobility management method of the present invention provides the radio communication mobility management apparatus or the radio communication terminal apparatus when the combination of the synchronization channel identifier and the group identifier is duplicated between different closed service group cells. However, there is a step of determining whether or not access is possible using the complete identifier of the closed service group cell during the handover preparation period.

  According to the above configuration, when the combination of the synchronization channel identifier and the group identifier overlaps, access is determined using the complete identifier of the closed service group cell, so access to the closed service group cell without access authority is performed. Can be avoided and signaling that is wasted after the handover preparation period can be reduced.

  Also, the radio communication mobility management method of the present invention includes a step of transmitting a handover request message including a flag indicating a possibility of handover failure.

  According to the above configuration, since the handover request message is transmitted including a flag indicating the possibility of handover failure, the handover failure is detected at an early stage, and the return to the original radio communication base station apparatus is performed. Can be urged.

  The wireless communication movement management method according to the present invention includes a step in which the wireless communication terminal apparatus starts a timer in response to a flag included in a handover request message; And the home wireless communication base station device sends a message indicating a handover failure when the timer expires without accessing.

  According to the above configuration, when the timer expires without accessing within the specified time, a message indicating handover failure is sent, so that unnecessary signaling after the handover preparation period is reduced, and a closed service without access authority is provided. Access to the group cell can be avoided.

  In the radio communication mobility management method according to the present invention, the group identifier includes a first group identifier unique to a macro cell and a second group identifier for identifying a group in the macro cell. A communication base station apparatus broadcasts the first group identifier in system information; and the home radio communication base station apparatus broadcasts the second group identifier on a broadcast channel. Have.

  According to the above configuration, since the group identifier is divided into two parts, the overhead of broadcast information can be reduced.

  Further, in the radio communication mobility management method of the present invention, the radio communication terminal apparatus detects the first group identifier from broadcast information of the radio communication base station apparatus, and the radio communication terminal apparatus Detecting a group identifier of 2 and combining with the first group identifier to determine whether it is equal to a group identifier of an accessible closed service group cell; and the wireless communication terminal device includes a synchronization channel identifier and a group identifier. Sending the included measurement result message to the radio communication base station apparatus.

  According to the above configuration, since the measurement result message is transmitted based on the synchronization channel identifier, the first group identifier, and the second group identifier, an increase in overhead in handover such as multiple measurement result message transmissions is suppressed. be able to.

  The radio communication mobility management method according to the present invention includes a step of assigning a plurality of group identifiers to a closed service group cell existing at a macro cell boundary.

  According to the above configuration, since a plurality of group identifiers are assigned to the closed service group cell existing at the boundary of the macro cell, the closed service group cell that can be accessed even if moving from any neighboring macro cell is detected, and the handover process is performed. It can be done accurately.

  Further, the radio communication mobility management method of the present invention includes a step of notifying the radio communication terminal apparatus of the first group identifier using a measurement command or a handover command.

  According to the above configuration, since the first group identifier is notified to the radio communication terminal apparatus using the measurement command or the handover command, the overhead of broadcast information can be reduced.

  Further, in the radio communication mobility management method of the present invention, the step of setting the first group identifier as a synchronization channel identifier assigned to each macro cell, and the radio communication terminal apparatus in the process of cell search for a macro cell, Detecting a group identifier.

  According to the above configuration, since the first group identifier is the synchronization channel identifier assigned to each macro cell, the first group identifier that is new information is added to the broadcast information, measurement command, and handover command of each macro cell. Without performing this, a series of handover operations to the closed service group cell can be performed.

  Further, the radio communication mobility management method of the present invention includes a complete identifier of a closed service group cell, a synchronization channel identifier, and a group set by the radio communication mobility management device in association with each other when the home radio communication base station device is set up. Managing identifiers.

  According to the above configuration, since the complete identifier, the synchronization channel identifier, and the group identifier of the closed service group cell are set and managed in association with each other, ID management in the network and the wireless communication terminal device can be simplified.

  Further, the wireless communication mobility management method of the present invention provides the identification information of the closed service group cell accessible by the wireless communication terminal apparatus, which is notified as a closed service group access list from the wireless communication mobility management apparatus. A step of storing in the memory in the own device, and a step of updating the memory information of the wireless communication terminal device by a notification from the wireless communication mobility management device when there is a change in the identification information of the closed service group cell And having.

  According to the above configuration, when there is a change in the identification information of the closed service group cell, the memory information is updated by a notification from the wireless communication mobility management device, so that ID management in the network can be easily performed.

INDUSTRIAL APPLICABILITY The present invention has an effect of suppressing an increase in P-BCH (MIB) overhead as much as possible and reducing power consumption of a wireless terminal, and can be used as a wireless communication terminal apparatus, a wireless communication system, a wireless reception method, and the like.

The figure which shows the structure of the mobile radio | wireless communications system which concerns on Embodiment 1 of this invention. Explanatory drawing when allocating across different P-SCH (Primary-SCH) in Embodiment 1 of the present invention Explanatory drawing when assigning SCH IDs belonging to the same P-SCH in Embodiment 1 of the present invention The figure which shows the structure of Home Node B103 which concerns on Embodiment 1 of this invention. The flowchart which shows a series of operation | movement of the measurement of the CSG cell which concerns on Embodiment 1 of this invention, detection of accessibility, and Measurement Report The figure which shows the structure of UE104 which performs the detection of CSG cell and Measurement Report in Embodiment 1 of this invention. The figure which shows an example of White List which concerns on Embodiment 1 of this invention The figure which shows the sequence of a measurement of the CSG cell which concerns on Embodiment 1 of this invention, the detection of the accessible CSG cell, Measurement Report, and Handover The figure which shows Handover Procedure between the CSG cells (Home Node B) concerning Embodiment 1 of this invention The figure which shows Handover Procedure which concerns on Embodiment 2 of this invention The figure which shows that Handover Request is repeatedly performed until Handover ACK is returned in Embodiment 2 of this invention. The figure which shows the sequence which judges UE access permission in Target Home Node B in Embodiment 2 of this invention FIG. 11 is a sequence diagram when a Handover Request is sent for Home Node B accessible by Source Macro Node B in Embodiment 2 of the present invention. The figure which shows the structure of Macro Node B102 which concerns on Embodiment 2 of this invention. The figure which shows the structure of Home Node B103 which concerns on Embodiment 2 of this invention. The figure which shows the structure of MME101 which concerns on Embodiment 2 of this invention. The figure which shows the structure of the mobile radio | wireless communications system which concerns on Embodiment 3 of this invention. Explanatory drawing which divides CSG group ID into two parts in Embodiment 3 of this invention The figure which showed Handover Procedure from Macro Node B (Macro cell) in Embodiment 3 of this invention to Home NB (CSG cell) Flowchart of a series of operations of CSG cell measurement and measurement report accessible in the third embodiment of the present invention Explanatory drawing which allocates several CSG Group to the CSG cell which exists in the boundary of a macrocell in Embodiment 3 of this invention Explanatory drawing which uses Measurement Command as a notification method to UE of CSG Group ID1 in Embodiment 3 of this invention. Explanatory drawing using Handover Command as a notification method to UE of CSG Group ID1 in Embodiment 3 of the present invention The flowchart which shows a series of operation | movement of Measurement of CSG cell, detection of ID, and Measurement Report in Embodiment 4 of this invention. The figure which shows the ID structure of the CSG cell in Embodiment 5 of this invention compared with a macro cell Explanatory drawing when a series of IDs that can be accessed in Embodiment 5 of the present invention is notified from the MME as a CSG access list Sequence diagram (1) showing a series of operations of a CSG cell access right confirmation and handover control method in Embodiment 6 of the present invention The figure which shows the structure of Macro Node B which concerns on Embodiment 6 of this invention. The figure which shows the structure of Home Node B which concerns on Embodiment 6 of this invention. The figure which shows the structure of MME which concerns on Embodiment 6 of this invention. The figure which shows an example of the information (including CSG bit) alert | reported from Home Node B in Embodiment 6 of this invention Sequence diagram (2) showing a series of operations of the CSG cell access right confirmation and handover control method according to Embodiment 6 of the present invention FIG. (1) for demonstrating the problem which concerns on Embodiment 7 of this invention FIG. (2) for demonstrating the problem which concerns on Embodiment 7 of this invention FIG. (1) showing the confirmation of the access right of the CSG cell and the handover control sequence in the seventh embodiment of the present invention The flowchart which shows the selection method of the access right confirmation method of Macro Node B which returned the access right information in Embodiment 7 of this invention FIG. (2) showing the confirmation of the access right of the CSG cell and the handover control sequence in the seventh embodiment of the present invention The figure which shows the confirmation of the access right of the CSG cell in Embodiment 8 of this invention, and a handover control sequence The figure which shows an example of the information (including L bit) alert | reported from Home Node B in Embodiment 8 of this invention Explanatory drawing when UE 104 enters the coverage area of CSG cell 103 'in the conventional system Explanatory drawing of the procedure which hands over from macrocell 105 to CSG cell 103 'in the conventional system

101 Wireless communication mobility management device (MME)
102 Macrocell wireless communication base station equipment (Macro Node B)
103 Home radio base station equipment (Home Node B)
104 Wireless communication terminal equipment (UE)
105 Macro cell 106 Macro tracking area 111, 214 Synchronization information transmission unit 112, 215 Broadcast information transmission unit 113, 121, 205, 218, 505 Wireless transmission / reception unit 114, 206, 219, 506 Network interface unit 122 Level detection unit 123 Synchronization information reception Unit 124, 502 Notification information receiving unit 125, 203, 503 Control signal receiving unit 126, 204, 224, 504 Control signal transmitting unit 127 Determination unit 128 User data storage unit 129 User data processing unit 2011, 2111, 221 Database 202 Peripheral cell Detection unit 207, 501, 226 Control processing unit 212, 222 Access determination unit 213 Timer management unit 216, 223 Control information reception unit 217 Control signal transmission unit 218 Wireless transmission / reception unit 225 Interface Scan unit

Claims (7)

Synchronization information receiving means for receiving the synchronization channel identifier of the first base station from the first base station through the synchronization channel;
Control signal receiving means for receiving a reception level measurement instruction from the second base station;
Level detection means for measuring a reception level of a signal transmitted from the first base station;
Broadcast information receiving means for receiving the first group identifier from the first base station through the broadcast channel;
Transmitting means for transmitting a measurement result message including the reception level to the second base station based on the synchronization channel identifier of the first base station and the first group identifier;
A wireless communication terminal apparatus comprising: The control signal receiving means further receives a list indicating accessible base stations,
The transmission means transmits a measurement result message including the reception level to the second base station based on the synchronization channel identifier, the group identifier, and the list.
The wireless communication terminal device according to claim 1.   The radio communication terminal apparatus according to claim 1, wherein the measurement result message further includes the synchronization channel identifier and the group identifier. The broadcast information receiving means further receives a second group identifier from the second base station through a broadcast channel,
The transmission means transmits a measurement result message including the reception level to the second base station based on the synchronization channel identifier, the first group identifier, and the second group identifier. The wireless communication terminal device according to claim 3. The synchronization information receiving means further receives the synchronization channel identifier of the second base station from the second base station through the synchronization channel;
The transmission means sends a measurement result message including the reception level to the second base station based on the synchronization channel identifier of the first base station, the synchronization channel identifier of the second base station, and the first group identifier. Send to base station,
The wireless communication terminal device according to any one of claims 1 to 3. A wireless communication terminal device according to claim 1;
A home radio communication base station comprising synchronization information transmitting means for transmitting a synchronization channel identifier through a synchronization channel and broadcast information transmitting means for transmitting a group identifier through a broadcast channel, the home radio communication base station being identified by the synchronization channel identifier and the group identifier a device, Ri Tona,
The home radio communication base station apparatus, a wireless communication system that corresponds to the first base station according to claim 1. A synchronization information receiving step of receiving the synchronization channel identifier of the first base station from the first base station through the synchronization channel;
A control signal receiving step of receiving a reception level measurement instruction from the second base station;
A level detection step of measuring a reception level of a signal transmitted from the first base station;
A broadcast information receiving step of receiving a first group identifier from the first base station through a broadcast channel;
Transmitting a measurement result message including the reception level to the second base station based on the synchronization channel identifier of the first base station and the first group identifier;
A wireless reception method comprising:

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