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CN102256233B - Closed subscriber group (CSG) cell handover method, equipment and system - Google Patents

Closed subscriber group (CSG) cell handover method, equipment and system Download PDF

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Publication number
CN102256233B
CN102256233B CN2011101767943A CN201110176794A CN102256233B CN 102256233 B CN102256233 B CN 102256233B CN 2011101767943 A CN2011101767943 A CN 2011101767943A CN 201110176794 A CN201110176794 A CN 201110176794A CN 102256233 B CN102256233 B CN 102256233B
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target
csg cell
plmn
csg
base station
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CN102256233A (en
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杨义
张娟
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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Priority to PCT/CN2012/073101 priority patent/WO2013000303A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/08—Access security
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a closed subscriber group (CSG) cell handover method, CSG cell handover equipment and a CSG cell handover system, which are used for realizing the handover of user equipment (UE) to a CSG cell in a given public land mobile network (PLMN), wherein the given PLMN is any PLMN except the PLMN in which the UE is currently registered and the PLMNs in an equivalent PLMN list. The CSG cell handover method provided by the invention comprises the following steps of: receiving a proximity indicator message which is transmitted by the UE when approaching to a target CSG cell, wherein the target CSG cell is the CSG cell in the given PLMN of the UE and the given PLMN is any PLMN except the PLMN in which the UE is currently registered and the PLMNs in the EPLMN list; and performing the handover of the UE to the target CSG cell according to the proximity indicator message.

Description

CSG cell switching method, device and system
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a device, and a system for Closed Subscriber Group (CSG) cell handover.
Background
The CSG function can provide a higher access level and a faster service rate for the member user, and can also implement a special charging mode based on the CSG cell. When a User Equipment (UE) subscribes to a member User of some CSG cells, a higher access level and a higher service rate can be obtained. A UE may be subscribed to multiple CSG members of a Public Land Mobile Network (PLMN) at the same time.
Home base stations (Home Node bs, HNBs) and evolved Home base stations (Home evolved NodeB, henbs) are low-power small base stations, which can provide higher speed for users in a smaller coverage range, and also can solve the coverage problem of a location with poor signal propagation for an operator. Typical application scenarios include homes and businesses. Fig. 1 shows a network architecture after a Long Term Evolution Advanced (LTE-a) system introduces an HeNB, where the HeNB may be directly connected to a core network, or may be connected to the core network through a proxy Node, i.e., an evolved Home base station Gateway (HeNB Gateway, HeNB GW). An X2 interface may be established between henbs.
Each CSG cell has a CSG Identifier (ID), and the ue may obtain the CSG ID and the operating mode supported by the cell through system information broadcast over an air interface. A cell supporting the CSG function may have two operating modes: closed (Closed) mode and Hybrid (Hybrid) mode. The CSG cell in the closed mode only allows the subscriber subscribed with the CSG ID to access, and the CSG cell in the mixed mode (which may also be referred to as a Hybrid cell) allows access to both the subscribed subscriber and the non-subscribed subscriber, but provides a higher access level and a faster service rate for the subscribed subscriber. HNBs and henbs are typical base stations that implement CSG functionality. Technically, other types of base stations, such as: both evolved base station (eNB) and Relay Node (RN) may implement CSG functionality.
If the UE subscribes to a CSG cell, the UE and a Home Subscriber Server (HSS) both store a CSG white list, whose contents are a PLMN ID and a CSG ID subscribed under the PLMN. When the UE searches a CSG cell, judging whether the UE can access the CSG cell according to the CSG white list. When the UE registers to the network, the HSS may send information of a CSG cell subscribed by the user on the currently registered PLMN to a serving Mobility Management Entity (MME) of the UE. Referring to fig. 2, the Update Location Answer (Update Location Answer) message includes CSG subscription data. The CSG subscription data includes a CSG ID, expiration time, and the like. When the UE accesses the CSG cell, the MME verifies whether the UE is allowed to access the CSG cell.
Referring to fig. 3, when a UE in a connected state approaches a CSG member cell belonging to a currently registered PLMN, the UE sends a Proximity Indicator (Proximity Indicator) message to a serving base station, and informs the serving base station of frequency information of the cell. Then, the serving base station may send the measurement configuration for the frequency to the UE, so that the UE reads the system information of the Cell, and reports important information therein, such as Physical Cell Identity (PCI), EUTRAN Cell Global Identity (ECGI), CSG ID, member status (for indicating whether the UE is a member user of the CSG Cell), and the like, to the serving base station, thereby facilitating the serving base station to select a target Cell for the UE. Before the UE transmits the proximity indication message, the base station needs to indicate whether the UE activates the proximity indication function in a Radio Resource Control (RRC) connection reconfiguration message. After the base station activates the proximity indication function, the UE may send a proximity indication message to the serving base station when the reporting condition is satisfied.
The flow when the UE performs the X2 interface handover is shown in fig. 4. And the Source base station (Source eNB) performs handover judgment according to the measurement result of the UE, selects a proper Target cell and sends a handover request message to the Target eNB. And after reserving resources for the UE, the target base station returns a confirmation message to the source base station, generates a switching command and sends the switching command to the UE through the source base station. And the UE establishes RRC connection with the target cell after receiving the switching command and returns an RRC connection reconfiguration completion message to the target base station. Then, the target base station sends a path switching request message to the MME, updates the position information of the UE, and switches a downlink data transmission path. And finally, the target base station informs the source base station to release the air interface resource of the UE.
When the source cell and the target cell are both CSG cells and have the same CSG ID, if the target cell supports registration of the UE on the PLMN of the source cell or equivalent PLMN, the UE may perform handover of the X2 interface between the two cells. Otherwise, only the switching of the S1 interface can be performed.
The flow when the UE performs the S1 interface switching is shown in fig. 5. The source base station performs handover decision according to the measurement result of the UE, selects a suitable target cell, and sends a handover request message to an MME (i.e., source MME) of the UE. The source MME finds a target MME (TargetMME) according to the identification of the target cell, and the target MME sends a switching request to the target base station. And after reserving resources for the UE, the target base station returns a switching request confirmation message to the target MME, generates a switching command and sends the switching command to the UE through the source MME and the source base station. And the UE establishes RRC connection with the target cell after receiving the switching command and returns an RRC connection reconfiguration completion message to the target base station. And then the target base station sends a switching notification message to the MME, updates the position information of the UE and switches a downlink data transmission path. And finally, the target MME informs the source side of releasing the resources of the UE.
When the target cell is a CSG cell, the source side (which may be an eNB, HeNB, RN, etc.) sends the CSG ID of the target cell to the source MME in a Handover request (Handover Required). The source MME checks if the CSG ID is a member cell under the UE currently registered PLMN. If yes, the following S1 interface switching process is continuously executed, otherwise, the switching is refused. When the target cell is a Hybrid cell, the source MME judges whether the UE is a member user of the target Hybrid cell or not, and transmits the judgment result (member or non-member) to the target MME; the target MME transmits the CSG ID and the member state to the target eNB through a Handover Request (Handover Request).
Fig. 6 illustrates a UE context modification procedure for modifying a context that has been established for the UE, including modifying security keys, CSG membership status, and the like. When MME enables a new root Key (K)ASME) Or the CSG member status of the UE changes, etc., the MME may initiate a UE context modification procedure.
When the serving cell of the UE is the CSG cell in the closed mode, the eNB may switch the UE to another cell or release the connection of the UE when knowing that the CSG member state of the UE changes (changes from member to non-member) through a UE Context Modification Request (UE Context Modification Request) message.
When the serving cell of the UE is a Hybrid cell, the eNB learns that the CSG member status (membership status) of the UE is changed (from a member to a non-member or from a non-member to a member) through the UE Context ModificationRequest message, and serves the UE according to the changed member status.
However, in the prior art, since the UE reports the CSG member cells under the currently registered PLMN and an Equivalent PLMN list (hereinafter abbreviated EPLMN list) only in the proximity indication, the serving base station of the UE can only know which CSG cells under these PLMNs are the subscribed member cells of the UE. This will result in the serving base station of the UE being able to only handover the UE to CSG member cells under these PLMNs. When the UE subscribes to CSG member cells of multiple operators, the CSG information that the UE subscribes to per operator may be different, and the PLMN IDs of some subscribed operators may not appear on the EPLMN list. When the UE approaches a CSG member cell under an unregistered operator, but the PLMN ID corresponding to the CSG member cell is not in the EPLMN list, the UE cannot report that the CSG member cell is also the CSG member cell to the network side, and therefore the serving base station of the UE cannot switch the UE to the CSG member cell, thereby affecting the UE to enjoy member treatment of the CSG member cell.
Disclosure of Invention
The embodiment of the invention provides a CSG cell switching method, equipment and a system, which are used for switching UE to CSG cells except registered PLMN and CSG cells under EPLMN list.
The CSG cell switching method provided by the embodiment of the invention comprises the following steps:
receiving a proximity indication message sent by User Equipment (UE) when the UE approaches a target CSG cell, wherein the target CSG cell is a CSG cell in a specific Public Land Mobile Network (PLMN) of the UE, and the specific PLMN is a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list (EPLMN list);
and switching the UE to the target CSG cell according to the proximity indication message.
Another CSG cell handover method provided in an embodiment of the present invention includes:
the method comprises the steps that User Equipment (UE) determines to be close to a target CSG cell, the target CSG cell is a specific Public Land Mobile Network (PLMN) of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list;
the UE determines that a proximity indication message is required to be sent to a network side, wherein the proximity indication message is used for realizing that the network side switches the UE to a target CSG cell;
and the UE sends a proximity indication message to the network side.
The base station device provided by the embodiment of the invention comprises:
a proximity indication message receiving unit, configured to receive a proximity indication message sent by a UE when the UE approaches a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list;
and the CSG cell switching unit is used for switching the UE to the target CSG cell according to the proximity indication message.
An embodiment of the present invention provides a mobility management device, including:
a receiving unit, configured to receive a PLMN ID, a CSGID, and a cell access mode of a target CSG cell sent by a source base station of a UE;
and the target MME is used for notifying the PLMN ID, the CSG ID and the cell access mode of the target CSG cell of the target MME.
The network system provided by the embodiment of the invention comprises:
a base station, configured to receive a proximity indication message sent by a UE when approaching a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list; determining a target CSG cell according to the proximity indication message; informing a source mobility management entity MME of the UE of the PLMN ID, the CSG ID and the cell access mode of the target CSG cell;
the MME is used for notifying the target MME of the received PLMN ID, CSG ID and cell access mode information when receiving the PLMN ID, CSG ID and cell access mode of the target CSG cell sent by a source base station of the UE when serving as the source MME of the UE; when the target MME serving as the UE receives the PLMN ID, the CSG ID and the cell access mode of the target CSG cell sent by the source MME of the UE, the target base station is informed that the UE is a member user of the target CSG cell.
Another network system provided in an embodiment of the present invention includes:
a base station, configured to receive a proximity indication message sent by a UE when approaching a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list; switching the UE to a target CSG cell according to the proximity indication message;
a mobility management entity MME, which is used for acquiring CSG subscription data of the PLMN when the MME is used as a target MME of the UE, and judging whether the UE is a member user of a target CSG cell or not according to the CSG subscription data; and when the UE is determined not to be the member user of the target CSG cell, releasing the connection of the UE or informing the target base station that the UE is not the member user of the target CSG cell.
The embodiment of the invention provides user equipment, which comprises:
a proximity determining unit, configured to determine that the UE is close to a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list;
a determining and indicating unit, configured to determine that a proximity indication message needs to be sent to a network side, where the proximity indication message is used to implement that the network side switches the UE to the target CSG cell;
and the sending indication unit is used for sending the proximity indication message to the network side.
In the embodiment of the invention, an approach indication message sent by User Equipment (UE) when approaching a target CSG cell is received, wherein the target CSG cell is a CSG cell in a specific Public Land Mobile Network (PLMN) of the UE, and the specific PLMN is a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list (evolved public land mobile network) EPLMN list; and switching the UE to the target CSG cell according to the proximity indication message, thereby realizing that the UE is switched to CSG cells except registered CSG cells under PLMN and EPLMN list.
Drawings
FIG. 1 is a diagram of an E-UTRAN network architecture including HeNBs;
FIG. 2 is a diagram illustrating an Update Location (Update Location) process;
FIG. 3 is a diagram illustrating a Proximity indication (Proximity indication) message;
FIG. 4 is a diagram illustrating the switching process of the X2 interface;
fig. 5 is a schematic diagram of the interface switching process of S1;
FIG. 6 is a diagram of a UE context modification procedure;
fig. 7 is a schematic general flowchart of a CSG cell handover method according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of the TAU process (when successful) provided by the embodiment of the present invention;
FIG. 9 is a schematic diagram of a TAU flow (in failure) provided by an embodiment of the present invention;
fig. 10 is a schematic flow chart illustrating a process of modifying the member status after the TAU process according to the embodiment of the present invention;
fig. 11 is a schematic structural diagram of a base station device according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of an MME according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a CSG cell switching method, equipment and a system, which are used for switching UE to CSG cells except registered PLMN and CSG cells under EPLMN list.
The embodiment of the invention allows the UE to report the CSG member cells under a plurality of operators, so that the base station has the opportunity to switch the UE to the CSG contracted cell under different PLMN.
According to the embodiment of the invention, when the CSG cell close to the UE is positioned in the CSG white list (not limited to whether the CSG cell is the CSG cell under the current registered PLMN), the UE sends the proximity indication to the service base station. The base station allocates a measurement Gap (Gap) for the UE to use for measurements on this PLMN in the measurement configuration. And the UE sends the information of PLMN ID, CSG ID, ECGI, PCI, member state and the like of the CSG cell to a service base station in the measurement report, so that the base station has a chance to switch the UE to the CSG cell.
The base station may configure whether the UE activates a proximity indication procedure on other PLMNs using the RRC connection reconfiguration message. The other PLMNs, that is, the specific PLMNs, described in the embodiment of the present invention refer to PLMNs other than the PLMN currently registered by the UE and the PLMN in the equivalent PLMN list EPLMN list.
In the CSG cell handover process, a target base station (i.e., a base station to which a target CSG cell belongs) and a target MME (i.e., an MME to which the target CSG cell belongs) first consider the UE as a member user of the target CSG cell (which may be simply referred to as a target cell), and handover the UE to the target cell. Then, after obtaining the CSG subscription data of the UE on the target PLMN (i.e., the PLMN to which the target CSG cell belongs), it is determined whether the UE is allowed to access the target cell.
In the embodiment of the present invention, the serving base station and the target base station of the UE include, but are not limited to, an eNB, an HNB, an HeNB, an RN, and the like.
Referring to fig. 7, at a network side, a CSG cell handover method provided in an embodiment of the present invention includes:
s101, receiving a proximity indication message sent by User Equipment (UE) when the UE approaches a target CSG cell, wherein the target CSG cell is a CSG cell in a PLMN (public land mobile network) of the UE, and the specific PLMN is a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMNlist;
and S102, switching the UE to the target CSG cell according to the proximity indication message.
Preferably, for an X2 interface handover (X2HO), the handing over the UE to the target CSG cell according to the proximity indication message includes:
and the source base station (the current service base station of the UE) of the UE determines the target CSG cell according to the proximity indication message and informs the target base station that the UE is a member user of the target CSG cell.
The determined target CSG cell includes information such as a serving base station (i.e., a target base station) of the determined target CSG cell.
Preferably, for S1 interface handover (S1 HO), the handing over the UE to the target CSG cell according to the proximity indication message includes:
the source base station of the UE determines a target CSG cell according to the proximity indication message;
a source base station of the UE informs a source mobility management entity MME of the UE of PLMNID, CSG ID and a cell access mode of a target CSG cell;
a source MME of the UE informs a target MME of a PLMN ID, a CSG ID and a cell access mode of a target CSG cell;
and the target MME informs the target base station UE of being a member user of the target CSG cell.
Preferably, for intra-base station handover (intra-eNB HO), the handing over the UE to the target CSG cell according to the proximity indication message includes:
and the serving base station of the UE takes the UE as a member user of the target CSG cell.
Preferably, after the UE is handed over to the target CSG cell, the method further includes:
the target MME acquires CSG subscription data of the PLMN, and judges whether the UE is a member user of the target CSG cell or not according to the CSG subscription data;
and when the target MME determines that the UE is not a member user of the target CSG cell, releasing the connection of the UE or informing the target base station that the UE is not a member user of the target CSG cell.
Preferably, when the target MME notifies the target base station that the UE is not a member user of the target CSG cell, the target MME notifies the target base station that the UE is not a member user of the target CSG cell by transmitting a Downlink NAS Transport message through a Downlink non-access stratum.
That is, after the UE is handed over to the target CSG cell, it is further verified whether the UE is a member user of the CSG cell to which the UE is handed over according to the CSG subscription data of the PLMN to which the UE is handed over.
Preferably, before the receiving the proximity indication message sent by the UE when the UE approaches the target CSG cell, the method further includes:
and sending indication information for activating the UE to execute the proximity indication function in the specific PLMN to the UE.
On the terminal side, a CSG cell handover method provided in an embodiment of the present invention includes:
the method comprises the steps that User Equipment (UE) determines to be close to a target CSG cell, the target CSG cell is a specific Public Land Mobile Network (PLMN) of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list;
the UE determines that a proximity indication message is required to be sent to a network side, wherein the proximity indication message is used for realizing that the network side switches the UE to a target CSG cell;
and the UE sends a proximity indication message to the network side.
Preferably, the determining, by the UE, that a proximity indication message needs to be sent to the network side includes:
the UE determines that a proximity indication message needs to be sent to a network side according to a preset proximity indication function executed in a specific PLMN; or,
and the UE determines that a proximity indication message needs to be sent to the network side according to indication information which is sent by the network side and used for activating the UE to execute the proximity indication function in the specific PLMN.
A description of several specific embodiments is given below.
The first embodiment is as follows: x2HO
The base station configures whether the UE activates to realize the proximity indication function on other PLMNs (namely PLMNs except the PLMN currently registered by the UE and the PLMN in the EPLMN list).
Under the premise that the proximity indication function is implemented on other PLMNs, when the UE approaches a cell in the CSG white list, the UE enters the coverage of the CSG cell, and the signal strength of the CSG cell reaches a preset threshold, the UE sends a proximity indication message to the serving base station, where the proximity indication message carries the frequency of the PLMN of the CSG cell and may further carry a PLMN ID.
When the UE approaches the target CSG cell, because the UE knows the ID of the currently registered PLMN and the EPLMN list, it can determine whether the target CSG cell is a CSG cell under another PLMN according to the PLMN ID corresponding to the CSG ID of the target CSG cell, and if the target CSG cell is a CSG cell under another PLMN and it is determined that the proximity indication function implemented on another PLMN is activated, send a proximity indication message to the serving base station. And then switching the UE to the target CSG cell by adopting the technical scheme provided by the embodiment of the invention. And if the target CSG cell is the registered CSG cell under the PLMN or the EPLMN list, switching the UE to the target CSG cell by adopting the prior art.
Judging whether the ID of the PLMN of the target cell is in a roaming limited list of the UE, if so, not measuring the cell; otherwise, the serving base station of the UE sends measurement configuration information for measuring the CSG cell to the UE, where the measurement configuration information includes a frequency of the PLMN, a measurement gap, and the like.
And the UE measures the CSG cell according to the measurement configuration information sent by the service base station and then sends the measured information such as the PCI to the service base station.
If the service base station can uniquely determine a CSG cell according to the PCI reported by the UE, the base station takes the CSG cell as one of the handover candidate cells. Otherwise, the serving base station notifies the UE to read information such as ECGI corresponding to the PCI, and at this time, the UE needs to report information such as ECGI, PLMN ID, CSG ID, and member status of the CSG cell corresponding to the PCI in the measurement report message.
Through the steps, the source base station of the UE can determine the target CSG cell, including determining the information of the PLMN, the base station and the like of the target CSG cell.
Then, if the serving base station (i.e., the source base station) of the UE decides to handover the UE to the target CSG cell, a handover request is sent to the target base station. The source base station indicates the ID of the PLMN of the target CSG cell (also PLMN ID located in the CSG whitelist of the UE) to the target base station in this message. When the target cell is a Hybrid cell, the source base station adds "member status" information in the message, that is, notifies the target base station that the UE is a member user of the target CSG cell, where the "member status" information is used to indicate whether the UE is a member user of the target cell.
The target base station returns a switching request confirmation message to the source base station.
The source base station sends a handover command (i.e., RRC connection reconfiguration message) to the UE.
And the UE sends an RRC connection reconfiguration completion message to the target base station.
The target base station sends a Path Switch Request (Path Switch Request) message to the MME of the UE, and notifies the MME of the PLMN ID (i.e., the PLMN ID of the target cell) currently registered by the UE.
The MME returns a Path Switch request acknowledge (Path Switch RequestAcknowledgee) message to the target base station.
The target base station sends a UE Context Release (UE Context Release) message to the source base station.
At this point, the operation of switching the UE to the target CSG cell is completed.
After the handover is completed, the UE performs a Tracking Area Update (TAU) process, the MME sends the ID of the currently registered PLMN of the UE (that is, the PLMN of the CSG cell currently being handed over to) to the HSS, the HSS searches for CSG subscription data corresponding to the PLMN ID, if found, the CSG subscription data of the UE on the PLMN is sent to the MME, otherwise, other data corresponding to the PLMN ID are sent to the MME, where there is no CSG subscription data. The MME judges whether the current CSG cell of the UE allows the UE to access according to the received CSG subscription data, and specifically comprises the following steps:
if the CSG cell to which the UE is currently handed over is a CSG cell in the closed mode and the UE is a member of the CSG cell (that is, the CSG subscription data includes an ID of the current CSG cell of the UE), as shown in fig. 8, the MME sends a TAU Accept (TAU Accept) message to the UE; otherwise, the MME may:
as shown in fig. 9, this TAU is rejected, and the connection of the UE is released;
alternatively, as shown in fig. 10, the MME sends a TAU Accept message to the UE. Subsequently, the MME initiates a UE context modification procedure to the serving base station of the UE, indicating that the UE is a "non-member" of the CSG cell. Subsequently, the serving base station of the UE releases the connection of the UE.
Alternatively, the MME indicates that the UE is "non-member" by carrying the Downlink NASTransport message of the TAU Accept message on the S1 interface, i.e. the last two steps in fig. 10 need not be performed. Subsequently, the serving base station of the UE releases the connection of the UE, and the base station executes the flow shown in fig. 6.
If the CSG cell to which the UE is currently handed over is a Hybrid cell and the UE is a member of the cell (that is, the CSG subscription data includes the ID of the current CSG cell of the UE), as shown in fig. 8, the MME sends a TAU Accept message to the UE; otherwise, as shown in fig. 10, after the MME sends the TAU Accept message to the UE, the MME initiates a UE context modification procedure to the serving base station of the UE, indicating that the UE is a "non-member" of the CSG cell, but the serving base station of the UE does not need to release the connection of the UE.
Similarly, the purpose achieved by the last two steps in fig. 10 can also be achieved by indicating that the UE is "non-member" in the Downlink NAS Transport message carrying the TAUAccept message on the S1 interface, so that the two steps are not performed any more, and then the base station performs the flow shown in fig. 6.
It should be noted that some steps in the first embodiment may be omitted, or some steps may be inserted into other processes. The first embodiment provides a better handover procedure. For example, the first step may be omitted, omitting the standardized configuration procedure by pre-specifying that the UE can perform proximity indication on other PLMNs.
Example two: s1 HO
The base station configures whether the UE activates to realize the proximity indication function on other PLMNs (namely PLMNs except the PLMN currently registered by the UE and the PLMN in the EPLMN list).
Under the premise that the proximity indication function is implemented on other PLMNs, when the UE approaches a cell in the CSG white list, the UE enters the coverage of the CSG cell, and the signal strength of the CSG cell reaches a preset threshold, the UE sends a proximity indication message to the serving base station, where the proximity indication message carries the frequency of the PLMN of the CSG cell and may further carry a PLMN ID.
When the UE approaches the target CSG cell, because the UE knows the ID of the currently registered PLMN and the EPLMN list, it can determine whether the target CSG cell is a CSG cell under another PLMN according to the PLMN ID corresponding to the CSG ID of the target CSG cell, and if the target CSG cell is a CSG cell under another PLMN and it is determined that the proximity indication function implemented on another PLMN is activated, send a proximity indication message to the serving base station. And then switching the UE to the target CSG cell by adopting the technical scheme provided by the embodiment of the invention. And if the target CSG cell is the registered CSG cell under the PLMN or the EPLMN list, switching the UE to the target CSG cell by adopting the prior art.
Judging whether the ID of the PLMN of the target cell is in a roaming limited list of the UE, if so, not measuring the cell; otherwise, the serving base station of the UE sends measurement configuration information for measuring the CSG cell to the UE, where the measurement configuration information includes a frequency of the PLMN, a measurement gap, and the like.
And the UE measures the CSG cell according to the measurement configuration information sent by the service base station and then sends the measured information such as the PCI to the service base station.
If the service base station can uniquely determine a CSG cell according to the PCI reported by the UE, the base station takes the CSG cell as one of the handover candidate cells. Otherwise, the serving base station notifies the UE to read information such as ECGI corresponding to the PCI, and at this time, the UE needs to report information such as ECGI, PLMN ID, CSG ID, and member status of the CSG cell corresponding to the PCI in the measurement report message.
If the serving base station (i.e. the source base station) of the UE decides to Handover the UE to the target cell, for example, decides to Handover the UE to the cell when the signal strength of the cell exceeds a preset threshold, a Handover request (Handover Required) is sent to the MME (i.e. the source MME) of the UE, and this message includes the PLMN ID selected by the source base station, the CSG ID of the target cell, and the cell access mode.
The source MME does not check whether the UE allows accessing the target cell, but sends information such as the PLMN ID of the target cell, the CSG ID of the target cell, and a cell access mode (closed cell mode or Hybrid cell mode) selected by the source base station to the target MME through a Forward Relocation Request (Forward Relocation Request) message.
And the target MME sends the PLMN ID of the target cell and the CSG ID of the target cell selected by the source base station to the target base station through a Handover Request message, namely the target MME informs the target base station that the UE is a member user of the target CSG cell, and the UE is allowed to access the target cell by default. If the target cell is a Hybrid cell, the MME also needs to set the "member state" to "member" in the Handover Request message.
The subsequent process is the same as the handover request confirmation step and the subsequent flow in fig. 5.
After the UE completes handover, as in the first embodiment, a TAU procedure is initiated to the MME to verify whether the UE can be handed over to the target CSG cell.
Example three: Intra-eNB HO
The base station configures whether the UE activates to realize the proximity indication function on other PLMNs (namely PLMNs except the PLMN currently registered by the UE and the PLMN in the EPLMN list).
Under the premise that the proximity indication function is implemented on other PLMNs, when the UE approaches a cell in the CSG white list, the UE enters the coverage of the CSG cell, and the signal strength of the CSG cell reaches a preset threshold, the UE sends a proximity indication message to the serving base station, where the proximity indication message carries the frequency of the PLMN of the CSG cell and may further carry a PLMN ID.
When the UE approaches the target CSG cell, because the UE knows the ID of the currently registered PLMN and the EPLMN list, it can determine whether the target CSG cell is a CSG cell under another PLMN according to the PLMN ID corresponding to the CSG ID of the target CSG cell, and if the target CSG cell is a CSG cell under another PLMN and it is determined that the proximity indication function implemented on another PLMN is activated, send a proximity indication message to the serving base station. And then switching the UE to the target CSG cell by adopting the technical scheme provided by the embodiment of the invention. And if the target CSG cell is the registered CSG cell under the PLMN or the EPLMN list, switching the UE to the target CSG cell by adopting the prior art.
Judging whether the ID of the PLMN of the target cell is in a roaming limited list of the UE, if so, not measuring the cell; otherwise, the serving base station of the UE sends measurement configuration information for measuring the CSG cell to the UE, where the measurement configuration information includes a frequency of the PLMN, a measurement gap, and the like.
And the UE measures the CSG cell according to the measurement configuration information sent by the service base station and then sends the measured information such as the PCI to the service base station.
If the service base station can uniquely determine a CSG cell according to the PCI reported by the UE, the base station takes the CSG cell as one of the handover candidate cells. Otherwise, the serving base station notifies the UE to read information such as ECGI corresponding to the PCI, and at this time, the UE needs to report information such as ECGI, PLMN ID, CSG ID, and member status of the CSG cell corresponding to the PCI in the measurement report message.
If the serving base station (i.e., the source base station) of the UE decides to handover the UE to the target cell, a handover command, i.e., an RRC connection reconfiguration message, is transmitted to the UE. The serving base station of the UE regards the UE as a member user of the target cell, and specifically, adds the identifier of the UE in a locally maintained target cell member list.
The UE returns an RRC connection reconfiguration Complete (RRC connection reconfiguration Complete) message to the serving base station.
And when the UE is switched to the target CSG cell, initiating a TAU process to the MME. And the MME sends the current registered PLMN of the UE to the HSS, and the HSS sends the CSG subscription data of the UE on the PLMN to the MME. And the MME judges whether the current CSG cell of the UE allows the UE to access according to the received CSG subscription data. If the MME has obtained the CSG subscription data of the UE under different PLMNs, it may determine whether the UE allows accessing the current CSG cell after receiving the TAU Request sent by the UE. The procedure in the first embodiment is followed.
In summary, in the embodiment of the present invention, the network configures whether the UE activates the proximity indication function on the other subscribed PLMNs. And the UE reports CSG member cells (PLMN ID, CSG ID, member state and the like) on other signed PLMNs. And the target base station and the target MME firstly regard the UE as a member user of the target cell in the switching process, and judge whether the UE is allowed to access the target cell after the CSG subscription data of the UE on the target PLMN is obtained.
In the embodiment of the invention, the MME side behavior has the following characteristics:
as a source MME, under the condition that CSG subscription data of the UE on a target PLMN are unknown, information such as PLMN ID, CSG ID, cell access mode and the like selected by a source base station is sent to the target MME;
as a target MME, under the condition that CSG subscription data of the UE on the target PLMN is not known, the UE is regarded as a member user of a target cell;
informing the target base station UE of being a non-member of the target cell through a Downlink NAS Transport message, namely informing the target base station UE of not being a member user of the target CSG cell through the Downlink NAS Transport message;
and informing the member state of the target cell (namely whether the target cell is a member user) of the UE by the Path Switch Request ACK process.
In the embodiment of the invention, the base station side behavior has the following characteristics:
configuring whether UE can report a proximity indication on a non-registered PLMN or not;
configuring a measurement gap for measuring CSG cells on other PLMNs for the UE;
CSG cells of other PLMNs may be listed as handover candidate cells;
and as the source base station, indicating the target base station UE as a member user of the target cell.
In the embodiment of the invention, the UE behavior has the following characteristics:
measuring CSG cells on other PLMNs according to the measurement configuration configured by the base station;
and carrying information such as PLMN IDs of CSG member cells on other PLMNs in the measurement report.
On the base station side, referring to fig. 11, a base station device provided in an embodiment of the present invention includes:
a proximity indication message receiving unit 11, configured to receive a proximity indication message sent by a UE when approaching a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list;
and a CSG cell switching unit 12, configured to switch the UE to the target CSG cell according to the proximity indication message.
Preferably, the CSG cell switching unit 12 determines the target CSG cell according to the proximity indication message, and notifies the target base station UE of being a member user of the target CSG cell.
Preferably, the CSG cell switching unit 12 may further determine a target CSG cell according to the proximity indication message; and informing a source mobility management entity MME of the UE that the UE is a member user of the target CSG cell.
Preferably, the CSG cell switching unit 12 may further use the UE as a member user of the target CSG cell.
Preferably, the apparatus further comprises:
an activating unit 13, configured to send, to the UE, indication information for activating the UE to perform a proximity indication function in a specific PLMN.
Referring to fig. 12, a mobility management device according to an embodiment of the present invention includes:
a receiving unit 31, configured to receive a PLMN ID, a CSG ID, and a cell access mode of a target CSG cell sent by a source base station of a UE;
a notification target MME unit 32, configured to notify the target MME of the PLMN ID, CSG ID, and cell access mode of the target CSG cell.
Preferably, the apparatus further comprises:
and a notification target base station unit 33, configured to notify the target base station UE of being a member user of the target CSG cell when receiving the PLMN ID, the CSG ID, and the cell access mode of the target CSG cell sent by the source MME of the UE.
An embodiment of the present invention provides a network system, including:
a base station, configured to receive a proximity indication message sent by a UE when approaching a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list; determining a target CSG cell according to the proximity indication message; informing a source mobility management entity MME UE of the UE of being a member user of a target CSG cell;
the MME is used for notifying the target MME of the received PLMN ID, CSG ID and cell access mode when receiving the PLMN ID, CSG ID and cell access mode of the target CSG cell sent by the source base station of the UE when serving as the source MME of the UE; when the target MME serving as the UE receives the PLMN ID, the CSG ID and the cell access mode of the target CSG cell sent by the source MME of the UE, the target base station is informed that the UE is a member user of the target CSG cell.
Preferably, the target MME is further configured to obtain CSG subscription data of the PLMN, and determine whether the UE is a member user of the target CSG cell according to the CSG subscription data; and when the UE is determined not to be the member user of the target CSG cell, releasing the connection of the UE or informing the target base station that the UE is not the member user of the target CSG cell.
Preferably, when the target MME notifies the target base station that the UE is not a member user of the target CSG cell, the target MME notifies the target base station that the UE is not a member user of the target CSG cell by transmitting a Downlink NAS Transport message through a Downlink non-access stratum.
In addition, another network system provided in the embodiment of the present invention includes:
a base station, configured to receive a proximity indication message sent by a UE when approaching a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list; switching the UE to a target CSG cell according to the proximity indication message;
the MME is used for acquiring CSG subscription data of the PLMN when the MME is used as a target MME of the UE, and judging whether the UE is a member user of a target CSG cell or not according to the CSG subscription data; and when the UE is determined not to be the member user of the target CSG cell, releasing the connection of the UE or informing the target base station that the UE is not the member user of the target CSG cell.
Preferably, the MME notifies the target base station that the UE is not a member user of the target CSG cell by transmitting a Downlink NAS Transport message through a Downlink non-access stratum, when notifying that the UE is not a member user of the target CSG cell.
Preferably, the base station determines the target CSG cell according to the proximity indication message, and notifies the target base station UE of being a member user of the target CSG cell;
or, the base station determines a target CSG cell according to the proximity indication message; informing a source MME of the UE that the UE is a member user of the target CSG cell;
or, the base station takes the UE as a member user of the target CSG cell.
It should be noted that the functions of the two network systems may be combined together, that is, one network system realizes the functions of the two network systems.
Referring to fig. 13, a user equipment provided in an embodiment of the present invention includes:
a proximity determining unit 21, configured to determine that the UE is close to a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list;
a determining and indicating unit 22, configured to determine that a proximity indication message needs to be sent to a network side, where the proximity indication message is used to implement that the network side switches the UE to the target CSG cell;
a sending instruction unit 23, configured to send a proximity instruction message to the network side.
Preferably, the determining and indicating unit 22 determines that a proximity indication message needs to be sent to the network side according to a preset proximity indication function executed in a specific PLMN; or,
the determining and indicating unit 22 determines that a proximity indication message needs to be sent to the network side according to indication information sent by the network side for activating the UE to execute the proximity indication function in the specific PLMN.
In summary, in the embodiments of the present invention, when the target CSG member cell does not support the currently registered PLMN and EPLMN of the UE but belongs to the subscriber subscribed CSG cell, and the source side does not have the CSG subscription information of the UE on the target PLMN, the source side notifies the target side that the UE is a member subscriber of the target cell.
When the X2 interface switching is executed, the source side is the source base station, and the source base station indicates the target base station UE as a member user of the target cell.
When executing interface switching of S1, the source side is a source MME, and the source MME sends information such as PLMNID, CSG ID, cell access mode and the like of a target cell to the target MME.
When the intra-base-station handover is executed, the source side and the target side are both the serving base station of the UE, and the serving base station regards the UE as a member user of the target cell.
And the target MME indicates the UE as a member user of the target cell in the Handover Request.
And after the target MME obtains the CSG subscription data of the UE on the target PLMN, the MME judges whether the UE is allowed to access the target CSG cell or not. And when the result is negative, releasing the connection of the UE or informing the base station to change the CSG member state of the UE.
The CSG cell information reported by the UE comprises PLMN ID, CSG member state and the like;
before reporting the CSG member cell, the UE receives configuration information which is transmitted by a base station and is measured on a non-registered PLMN;
before the UE sends the proximity indication, the UE receives indication information that the base station activates a 'proximity indication function on the unregistered PLMN'.
And when the MME has CSG subscription data of the UE on the target PLMN, the MME informs the target base station whether the UE is a member user of the target cell during path switching.
And when the MME does not store the CSG subscription data of the UE on the target PLMN, the core network indicates the member information through a downlink NAS direct transmission or UE context modification process.
Therefore, when the UE subscribes to CSG cells of a plurality of operators or PLMNs, the technical scheme provided by the embodiment of the invention can ensure that the UE can be switched between the subscribed CSG cells, breaks through the limitation that the cross-CSG cell switching can be carried out only on the registered PLMN or EPLMN at present, and can ensure that the UE can better obtain the service of CSG member cells.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (22)

1. A method for switching a Closed Subscriber Group (CSG) cell is characterized by comprising the following steps:
receiving a proximity indication message sent by User Equipment (UE) when the UE approaches a target CSG cell, wherein the target CSG cell is a CSG cell in a specific Public Land Mobile Network (PLMN) of the UE, and the specific PLMN is a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list (EPLMN list);
switching the UE to a target CSG cell according to the proximity indication message;
the proximity indication message is a proximity indication message sent by the UE to the serving base station when the CSG cell which the UE approaches is located in the CSG white list.
2. The method of claim 1, wherein the handing over the UE to the target CSG cell according to the proximity indication message comprises:
and the source base station of the UE determines the target CSG cell according to the proximity indication message and informs the target base station that the UE is a member user of the target CSG cell.
3. The method of claim 1, wherein the handing over the UE to the target CSG cell according to the proximity indication message comprises:
the source base station of the UE determines a target CSG cell according to the proximity indication message;
a source base station of the UE informs a source mobility management entity MME of the UE of PLMNID, CSG ID and a cell access mode of a target CSG cell;
a source MME of the UE informs a target MME of a PLMN ID, a CSG ID and a cell access mode of a target CSG cell;
and the target MME informs the target base station UE of being a member user of the target CSG cell.
4. The method of claim 1, wherein the handing over the UE to the target CSG cell according to the proximity indication message comprises:
and the serving base station of the UE takes the UE as a member user of the target CSG cell.
5. The method of any of claims 1-4, wherein after the UE is handed over to the target CSG cell, the method further comprises:
the target MME acquires CSG subscription data of the PLMN, and judges whether the UE is a member user of the target CSG cell or not according to the CSG subscription data;
and when the target MME determines that the UE is not a member user of the target CSG cell, releasing the connection of the UE or informing the target base station that the UE is not a member user of the target CSG cell.
6. The method of claim 5 wherein the target MME notifies the target base station that the UE is not a member user of the target CSG cell by Downlink non-access stratum transmission Downlink NAS Transport message if the target MME notifies the target base station that the UE is not a member user of the target CSG cell.
7. The method according to any of claims 1-4, wherein the receiving the proximity indication message sent by the UE when approaching the target CSG cell further comprises:
and sending indication information for activating the UE to execute the proximity indication function in the specific PLMN to the UE.
8. A method for switching a Closed Subscriber Group (CSG) cell is characterized by comprising the following steps:
the method comprises the steps that User Equipment (UE) determines to be close to a target CSG cell, the target CSG cell is a specific Public Land Mobile Network (PLMN) of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list;
the UE determines that a proximity indication message is required to be sent to a network side, wherein the proximity indication message is used for realizing that the network side switches the UE to a target CSG cell;
and when the CSG cell close to the UE is positioned on the CSG white list, the UE sends a close indication message to the service base station.
9. The method of claim 8, wherein the UE determines that a proximity indication message needs to be sent to a network side, comprising:
the UE determines that a proximity indication message needs to be sent to a network side according to a preset proximity indication function executed in a specific PLMN; or,
and the UE determines that a proximity indication message needs to be sent to the network side according to indication information which is sent by the network side and used for activating the UE to execute the proximity indication function in the specific PLMN.
10. A base station apparatus, characterized in that the apparatus comprises:
a proximity indication message receiving unit, configured to receive a proximity indication message sent by a UE when the UE approaches a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list; the proximity indication message is a proximity indication message sent by the UE to the base station when the CSG cell which the UE approaches is located in the CSG white list;
and the CSG cell switching unit is used for switching the UE to the target CSG cell according to the proximity indication message.
11. The apparatus according to claim 10, wherein the CSG cell switching unit determines a target CSG cell according to the proximity indication message, and notifies a target base station that the UE is a member user of the target CSG cell.
12. The apparatus according to claim 10, wherein the CSG cell switching unit determines a target CSG cell according to the proximity indication message; and informing a source mobility management entity MME of the UE of the PLMN ID, the CSG ID and the cell access mode of the target CSG cell.
13. The apparatus according to claim 10, wherein the CSG cell handover unit is configured to use the UE as a member user of the target CSG cell.
14. The apparatus according to any one of claims 10-13, further comprising:
an activating unit, configured to send, to the UE, indication information for activating the UE to perform a proximity indication function in a specific PLMN.
15. A network system, characterized in that the system comprises:
a base station, configured to receive a proximity indication message sent by a UE when approaching a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list; determining a target CSG cell according to the proximity indication message; informing a source mobility management entity MME of the UE of the PLMN ID, the CSG ID and the cell access mode of the target CSG cell; the proximity indication message is a proximity indication message sent by the UE to the base station when the CSG cell which the UE approaches is located in the CSG white list;
the MME is used for notifying the target MME of the received PLMN ID, CSG ID and cell access mode information when receiving the PLMN ID, CSG ID and cell access mode of the target CSG cell sent by a source base station of the UE when serving as the source MME of the UE; when the target MME serving as the UE receives the PLMN ID, the CSG ID and the cell access mode of the target CSG cell sent by the source MME of the UE, the target base station is informed that the UE is a member user of the target CSG cell.
16. The system of claim 15, wherein the target MME is further configured to obtain CSG subscription data of the PLMN, and determine whether the UE is a member user of the target CSG cell according to the CSG subscription data; and when the UE is determined not to be the member user of the target CSG cell, releasing the connection of the UE or informing the target base station that the UE is not the member user of the target CSG cell.
17. The system of claim 16 wherein the target MME notifies the target base station that the UE is not a member user of the target CSG cell by transmitting a Downlink NAS Transport message through a Downlink non-access stratum if the target MME notifies the target base station that the UE is not a member user of the target CSG cell.
18. A network system, characterized in that the system comprises:
a base station, configured to receive a proximity indication message sent by a UE when approaching a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list; switching the UE to a target CSG cell according to the proximity indication message; the proximity indication message is a proximity indication message sent by the UE to the base station when the CSG cell which the UE approaches is located in the CSG white list;
a mobility management entity MME, which is used for acquiring CSG subscription data of the PLMN when the MME is used as a target MME of the UE, and judging whether the UE is a member user of a target CSG cell or not according to the CSG subscription data; and when the UE is determined not to be the member user of the target CSG cell, releasing the connection of the UE or informing the target base station that the UE is not the member user of the target CSG cell.
19. The system of claim 18 wherein the MME notifies the target base station that the UE is not a member subscriber of the target CSG cell by transmitting a Downlink NAS Transport message through a Downlink non-access stratum if the MME notifies the target base station that the UE is not a member subscriber of the target CSG cell.
20. The system according to claim 18 or 19, wherein the base station determines a target CSG cell according to the proximity indication message, and notifies the target base station that the UE is a member user of the target CSG cell;
or, the base station determines a target CSG cell according to the proximity indication message; informing a source MME of the UE of the PLMN ID, the CSG ID and the cell access mode of the target CSG cell;
or, the base station takes the UE as a member user of the target CSG cell.
21. A user equipment, characterized in that the equipment comprises:
a proximity determining unit, configured to determine that the UE is close to a target CSG cell, where the target CSG cell is a specific public land mobile network PLMN of the UE, and the specific PLMN is a CSG cell in a PLMN except a PLMN currently registered by the UE and a PLMN in an equivalent PLMN list EPLMN list;
a determining and indicating unit, configured to determine that a proximity indication message needs to be sent to a network side, where the proximity indication message is used to implement that the network side switches the UE to the target CSG cell;
and the sending indicating unit is used for sending the proximity indication message to the serving base station when the CSG cell which the UE approaches is positioned on the CSG white list.
22. The apparatus of claim 21,
the determining and indicating unit determines that a proximity indication message needs to be sent to a network side according to a preset proximity indication function executed in a specific PLMN; or,
the determining and indicating unit determines that a proximity indication message needs to be sent to the network side according to indication information which is sent by the network side and used for activating the UE to execute the proximity indication function in the specific PLMN.
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