CN106376037B - Across PLMN switching method, base station and communication system in a kind of base station - Google Patents

Across PLMN switching method, base station and communication system in a kind of base station Download PDF

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CN106376037B
CN106376037B CN201510428543.8A CN201510428543A CN106376037B CN 106376037 B CN106376037 B CN 106376037B CN 201510428543 A CN201510428543 A CN 201510428543A CN 106376037 B CN106376037 B CN 106376037B
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base station
plmn
switching
handover
mme
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CN106376037A (en
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邹俊
许兵舰
游佳莹
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/142—Reselecting a network or an air interface over the same radio air interface technology

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses across PLMN switching methods in a kind of base station, it include: the PLMN negotiation result that base station obtains core net, determine that the network share scene of base station, the network share scene of the base station include that multi-operator core network (MOCN) is shared and gateway core network (GWCN) is shared according to the negotiation result；The measurement report that user equipment (UE) is sent is received, the PLMN of the PLMN of source cell and switching target small area in base station are determined according to the measurement report；When the PLMN difference of the PLMN of the source cell and the switching target small area, across PLMN switching in base station corresponding with the network share scene of the base station is executed.The embodiment of the present invention further simultaneously discloses a kind of base station and communication system.

Description

inter-PLMN switching method in base station, base station and communication system
Technical Field
The present invention relates to Public Land Mobile Network (PLMN) handover technology in the field of communications, and in particular, to a PLMN-crossing handover method in a base station, and a communication system.
Background
Long Term Evolution (LTE) is a mobile communication System of Universal Mobile Telecommunications System (UMTS) technical standard established by The 3rd Generation Partnership Project (3 GPP) organization. In general, in an LTE mobile communication system, an operator network, also called PLMN, is divided into two parts, namely a core network and an access network, where a core network node is composed of a Mobility Management Entity (MME), a Serving Gateway (SGW), a packet data Gateway (PGW, PDN Gateway), and the like; the access network Node is composed of an Evolved Node B (eNodeB), and the involved network nodes are an MME and an eNodeB in the PLMN selection/handover process.
Network sharing refers to sharing of a wireless network between different operators. Two architecture modes of Network sharing are defined in the 3GPP TS 23.251 protocol, which are a Multi-Operator Core Network (MOCN) sharing technology and a Gateway Core Network (GWCN) sharing technology, respectively. As shown in fig. 1, an MOCN is an eNodeB connected to multiple core network nodes, and an eNodeB network element is shared among multiple operators to provide services for the multiple operators. As shown in fig. 2, the GWCN is a shared access network and a part of core network nodes, and not only eNodeB network elements are shared, but also a part of core network devices (e.g., MME) are shared, so as to provide services for multiple operators.
In a mobility scenario under network sharing, an eNodeB needs to support handover between the same PLMN, and also supports handover between a shared LTE area and a non-shared LTE area, between a shared LTE area and a 2G/3G area, and between different PLMNs. For the switching between different PLMNs, namely the switching across PLMNs, the protocol can only adopt the switching mode of X2 among stations or S1 among stations. Wherein, the X2 handover is the direct transmission of data and signaling by the handover between eNodeBs, and the S1 handover is the transfer of data and signaling by the eNodeBs through the MME.
In an LTE system, in an existing network sharing architecture, in a cell scenario where a User Equipment (UE) is handed over from a cell of one PLMN1 in an enodeb to another PLMN2, since the enodeb cannot synchronously update changed UE context information (including information such as PLMNs) to a corresponding MME, a cross-PLMN handover scenario in the enodeb cannot be realized in the prior art. Moreover, in the existing network sharing scenario, when the measurement report reported by the UE meets the intra-enodeb handover condition, the UE cannot perform intra-enodeb handover in time to cause a UE call drop due to the fact that the prior art does not support the intra-enodeb inter-PLMN scenario, and the application scenario of network sharing is limited.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention desirably provide a method for switching inter-PLMN in a base station, and a communication system, so as to solve the problem that the prior art does not support inter-PLMN scenes in the base station, and reduce UE dropped calls caused by inter-PLMN switching in the base station, thereby improving flexibility, universality, and stability of an application scene of network sharing.
The technical scheme of the invention is realized as follows:
the embodiment of the invention provides a method for switching cross-PLMN in a base station, which comprises the following steps:
acquiring a PLMN negotiation result of a core network, and determining a network sharing scene of a base station according to the negotiation result, wherein the network sharing scene of the base station comprises multi-operator core network MOCN sharing and gateway core network GWCN sharing;
receiving a measurement report sent by User Equipment (UE), and determining a Public Land Mobile Network (PLMN) of a source cell and a PLMN of a switching target cell in a base station according to the measurement report;
and when the PLMN of the source cell is different from the PLMN of the switching target cell, executing inter-PLMN switching in the base station corresponding to the network sharing scene of the base station.
Wherein the inter-PLMN handover within the base station corresponding to the network sharing scenario of the base station comprises: a handover preparation phase and a handover execution phase.
The network sharing scene of the base station is MOCN sharing, and inter-PLMN switching in the base station under the MOCN sharing scene is executed; the handover preparation phase comprises:
sending a first switching request message to a source Mobile Management Entity (MME), wherein the first switching request message carries PLMN information of a switching target cell, so that the source MME determines a target MME according to the PLMN information of the switching target cell;
receiving a second switching request message sent by the target MME, wherein the second switching request message carries the bearer information created by the target MME;
sending a handover request acknowledgement message to the target MME, wherein the handover request acknowledgement message indicates that the handover target cell completes handover admission processing and preparation;
and receiving a switching command message sent by the source MME, and creating a first RRC connection reconfiguration message corresponding to the switching according to the switching command message.
The network sharing scene of the base station is MOCN sharing, and inter-PLMN switching in the base station under the MOCN sharing scene is executed; the handover execution phase comprises:
sending the first RRC connection reconfiguration message to the UE, wherein the first RRC connection reconfiguration message indicates the UE to execute random access in the switching target cell;
sending a first state transition message to the source MME;
receiving a second state transition message sent by the target MME;
receiving a first RRC connection reconfiguration complete message sent by the UE, wherein the first RRC connection reconfiguration complete message indicates that the UE is switched completely;
sending a switching notification message to the target MME, and updating the context information of the UE to the target MME according to the switching notification message;
and receiving a UE context release command sent by the source MME, wherein the UE context release command indicates the release of the radio resources of the source cell and the release of the UE context.
The network sharing scene of the base station is GWCN sharing, and inter-PLMN switching in the base station under the GWCN sharing scene is executed; the handover preparation phase comprises:
and carrying the PLMN information of the switching target cell selected by the UE to a switching target side cell in a base station.
The network sharing scene of the base station is GWCN sharing, and inter-PLMN switching in the base station under the GWCN sharing scene is executed; the handover execution phase comprises:
sending a second RRC connection reconfiguration message to the UE, wherein the second RRC connection reconfiguration message indicates the UE to execute random access in the switching target cell;
receiving a second RRC connection reconfiguration complete message sent by the UE, wherein the second RRC connection reconfiguration complete message indicates that the UE is switched completely;
sending a path switching request message to an MME, and updating the context information of the UE to the MME according to the path switching request message;
and receiving a path switching request response message sent by the MME, and updating the context information of the UE and releasing the UE context according to the path switching request response message.
An embodiment of the present invention further provides a base station, where the base station includes: the device comprises an acquisition unit, a receiving unit and a switching unit; wherein,
the acquiring unit is used for acquiring a PLMN negotiation result of a core network and determining a network sharing scene of a base station according to the negotiation result, wherein the network sharing scene of the base station comprises multi-operator core network MOCN sharing and gateway core network GWCN sharing;
the receiving unit is used for receiving a measurement report sent by User Equipment (UE), and determining a Public Land Mobile Network (PLMN) of a source cell and a PLMN of a handover target cell in a base station according to the measurement report;
the switching unit is configured to execute inter-PLMN handover within the base station corresponding to the network sharing scenario of the base station when the PLMN of the source cell is different from the PLMN of the handover target cell.
Wherein the switching unit performs inter-PLMN handover within the base station corresponding to the network sharing scenario of the base station, including: a handover preparation phase and a handover execution phase.
Wherein the base station further comprises: a transmitting unit; if the network sharing scenario of the base station is MOCN sharing, in the handover preparation stage,
the sending unit is configured to send a first handover request message to a source mobility management entity MME, where the first handover request message carries PLMN information of the handover target cell, so that the source MME determines a target MME according to the PLMN information of the handover target cell; the target MME is also used for sending a switching request confirmation message to the target MME, wherein the switching request confirmation message indicates that the switching target cell is completed in switching admission processing and preparation;
the receiving unit is configured to receive a second handover request message sent by the target MME, where the second handover request message carries bearer information created by the target MME; and the source MME is also used for receiving a switching command message sent by the source MME and creating a first RRC connection reconfiguration message corresponding to the switching according to the switching command message.
Wherein, if the network sharing scene of the base station is MOCN sharing, the inter-PLMN switching in the base station under the MOCN sharing scene is executed, in the switching execution stage,
the sending unit is configured to send the first RRC connection reconfiguration message to the UE, where the first RRC connection reconfiguration message instructs the UE to perform random access in the handover target cell; further configured to send a first state transition message to the source MME; the UE is also used for sending a switching notification message to the target MME and updating the context information of the UE to the target MME according to the switching notification message;
the receiving unit is configured to receive a second state transition message sent by the target MME; the UE is further configured to receive a first RRC connection reconfiguration complete message sent by the UE, where the first RRC connection reconfiguration complete message indicates that the UE has completed handover; and the UE is further configured to receive a release order sent by the source MME, where the release order indicates release of radio resources of the source cell and release of the UE context.
Wherein, the base station also comprises a sending unit; if the network sharing scenario of the base station is GWCN sharing, in the handover preparation phase,
and the sending unit is used for carrying the PLMN information of the handover target cell selected by the UE to a handover target side cell in a base station.
Wherein, if the network sharing scenario of the base station is GWCN sharing, in the handover execution phase,
the sending unit is configured to send a second RRC connection reconfiguration message to the UE, where the second RRC connection reconfiguration message instructs the UE to perform random access in the handover target cell; the UE is also used for sending a path switching request message to an MME and updating the context information of the UE to the MME according to the path switching request message;
the receiving unit is configured to receive a second RRC connection reconfiguration complete message sent by the UE, where the second RRC connection reconfiguration complete message indicates that the UE has completed handover; and the UE is further configured to receive a path switching request response message sent by the MME, and update context information of the UE and release the UE context according to the path switching request response message.
An embodiment of the present invention further provides a communication system, where the communication system includes: user equipment, a core network and any of the base stations as described above.
The embodiment of the invention provides a method for switching over PLMN in a base station, the base station and a communication system, which are used for acquiring a PLMN negotiation result of a core network and determining a network sharing scene of the base station according to the negotiation result, wherein the network sharing scene of the base station comprises MOCN sharing and GWCN sharing; receiving a measurement report sent by UE, and determining the PLMN of a source cell and the PLMN of a switching target cell in a base station according to the measurement report; and executing inter-PLMN switching in the base station corresponding to the network sharing scene of the base station when determining that the PLMN of the source cell is different from the PLMN of the switching target cell. The embodiment of the invention carries out the processing scheme of the inter-PLMN switching in the base station corresponding to the network sharing scene by predetermining the network sharing scene of the base station, can effectively update the UE context information after the inter-PLMN switching in the base station to the MME, ensures the service continuity, also solves the problem that the prior art does not support the inter-PLMN scene in the base station, reduces the UE call drop caused by the inter-PLMN switching in the base station, and further improves the flexibility, the universality and the stability of the application scene of the network sharing.
Drawings
FIG. 1 is a schematic diagram of a MOCN architecture for network sharing;
figure 2 is a schematic diagram of a GWCN architecture for network sharing;
fig. 3 is a schematic diagram of a PLMN negotiation process between a base station and a core network in an MOCN scenario;
fig. 4 is a schematic diagram of a PLMN negotiation process between a base station and a core network in a GWCN scenario;
fig. 5 is a first flowchart of a method for switching inter-PLMN in a base station according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a second method for switching between inter-PLMN in a base station according to an embodiment of the present invention;
fig. 7 is a first schematic diagram illustrating a signaling flow for inter-PLMN handover in a base station according to an embodiment of the present invention;
fig. 8 is a third flowchart of a method for switching inter-PLMN in a base station according to an embodiment of the present invention;
fig. 9 is a schematic diagram illustrating a signaling flow of inter-PLMN handover in a base station according to an embodiment of the present invention;
fig. 10 is a first schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a base station according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example one
The base station is configured to include operator networks PLMN1 and PLMN2, the core network device includes MME1 and MME2, the operator network of MME1 is PLMN1, and the operator network of MME2 is PLMN 2.
As shown in fig. 3, the PLMN negotiation process between the base station and the core network in the MOCN scenario includes:
step 101, the eNodeB determines a Stream Control Transmission Protocol (SCTP) association established by a Transport Layer (Transport Layer), and numbers the association.
Specifically, the eNodeB determines SCTP association information of all MMEs according to the transport layer, and numbers the associations, where an association number of the MME1 may be AssoID1, and an association number of the MME2 may be AssoID 2.
Wherein, eNodeB may be abbreviated as eNB; the transport layer is a layer responsible for overall data transmission and data control transmission; SCTP is a reliable datagram transport protocol over protocols providing unreliable transport services, an association in SCTP is a correspondence between two SCTP endpoints, which contains the two SCTP endpoints and protocol state information including information such as authentication tags and transport sequence numbers, an association can be uniquely identified by the SCTP endpoint using the association with a transport address, and there will not be more than one association between the two SCTP endpoints at any time.
Step 102, the eNB sends S1 a setup request message.
Specifically, the eNB sends an S1SETUP REQUEST message to the MME1 on SCTP association as AssoID1, and simultaneously, the eNB sends an S1SETUP REQUEST message MME2 on SCTP association as AssoID 2. Wherein, the PLMN in Global eNB ID in the S1SETUP REQUEST message is a Global PLMN, and Broadcast PLMNs in Supported Tas fills out PLMN1 and PLMN 2.
Step 103, the eNB receives S1 the setup response message.
Specifically, on the SCTP association as AssoID1, the eNB receives an S1SETUP RESPONSE message replied by the MME1, where an operator List service Plmn List served in the S1SETUP RESPONSE message carries the Plmn1, and stores and supports the Plmn1 on the association AssoID1 of the MME1 for cell broadcasting and routing of subsequent MMEs. And on the SCTP association as AssoID2, the eNB receives an S1SETUP RESPONSE message replied by the MME2, wherein an operator List service Plmn List served in the S1SETUP RESPONSE carries the Plmn2, and stores support Plmn2 on the association AssoID2 of the MME2 for cell broadcast and routing of subsequent MMEs.
And step 104, the eNB selects an MME for the UE according to the PLMN supported by the corresponding SCTP coupling.
Specifically, the eNB selects an MME for the UE according to the PLMN condition supported by the corresponding SCTP association, the UE sends the selected PLMN information to the corresponding MME, and sends the S1 handover request to the MME accessed and handed in.
In an MOCN scenario, each MME only supports one single PLMN, and therefore, the network sharing scenario of the base station can be determined according to the number of PLMNs supported by each MME in the PLMN negotiation result of the base station and the core network.
Example two
The base station is set to comprise an eNB1 and an eNB2, operator networks including PLMN1 and PLMN2 are included in the eNB1, operator networks including PLMN1 are included in the eNB2, core network equipment includes an MME, and operator networks including the MME are PLMN1 and PLMN 2.
As shown in fig. 4, the PLMN negotiation process between the base station and the core network in the GWCN scenario includes:
step 201, the eNB determines the SCTP association established by the transport layer, and numbers the association.
Specifically, the eNB1 determines SCTP association information of the MME according to the self transport layer, the eNB2 determines SCTP association information of the MME according to the self transport layer, and the association number of the eNB1 with the MME is AssoID1, and the association number of the eNB2 with the MME is AssoID 2.
Step 202, the eNB sends S1 a setup request message.
Specifically, on SCTP association as AssoID1, eNB1 sends an S1SETUP REQUEST message to MME, where a PLMN in Global eNB ID in the S1SETUP REQUEST message is a Global PLMN, and broadcastlmns in Supported Tas fills in PLMN1 and PLMN 2.
Specifically, on SCTP association as AssoID2, eNB2 sends an S1SETUP REQUEST message to MME, where a PLMN in Global eNB ID in the S1SETUP REQUEST message is a Global PLMN, and broadcastlmns in Supported Tas fills in PLMN 1.
Step 203, the eNB receives S1 the setup response message.
Specifically, the eNB1 receives an S1SETUP RESPONSE message replied by the MME at the SCTP association as AssoID1, where an operator List service Plmn List served in the S1SETUP RESPONSE message carries the PLMNs 1 and the Plmn2, and selects the PLMNs that the eNB1 and the MME have in common, that is, the PLMNs 1 and the Plmn2, and then stores information supporting the PLMNs 1 and the Plmn2 on the association AssoID1 for cell broadcasting and routing of subsequent MMEs.
Specifically, the eNB2 receives an S1SETUP RESPONSE message replied by the MME at the SCTP association as AssoID2, where an operator List service Plmn List served in the S1SETUP RESPONSE message carries the Plmn1 and the Plmn2, and takes the Plmn, that is, the Plmn1, that the eNB1 and the MME commonly have, and then stores the supported Plmn1 on the association AssoID2 for cell broadcasting and routing of subsequent MMEs.
Specifically, in a GWCN scenario, each MME may support multiple PLMNs, and therefore, a network sharing scenario of a base station may be determined according to the number of PLMNs supported by each MME in a PLMN negotiation result of the base station and a core network.
EXAMPLE III
An embodiment of the present invention provides a method for switching inter-PLMN in a base station, as shown in fig. 5, the method includes:
301, the eNB obtains a PLMN negotiation result of a core network, and determines a network sharing scenario of the base station according to the negotiation result, where the network sharing scenario of the eNB includes MOCN sharing and GWCN sharing.
Specifically, in an MOCN scenario, each MME may only support one single PLMN, and in a GWCN scenario, each MME may support multiple PLMNs, and a network sharing scenario of the base station may be determined according to the number of PLMNs that each MME may support in a PLMN negotiation result of the core network, where the network sharing scenario includes MOCN sharing and GWCN sharing. The PLMN negotiation process between the base station and the core network may refer to embodiment one and embodiment two, which are not described herein again in this embodiment of the present invention.
As shown in fig. 1, the MOCN sharing technology is that one eNodeB is connected to multiple core network nodes, and eNodeB network elements are shared among multiple operators to provide services for the eNodeB network elements. As shown in fig. 2, the GWCN sharing technology is to share an access network and a part of core network nodes at the same time, and not only eNodeB network elements are shared, but also a part of core network devices (e.g. MME) are shared to provide services for multiple operators.
Step 302, the eNB receives a measurement report sent by the UE, and determines the PLMN of the source cell and the PLMN of the handover target cell in the base station according to the measurement report.
Specifically, after the eNB acquires a measurement report sent by the UE, the measurement report generally includes a measurement identifier, and the content of a frequency point corresponding to the current report, a measurement event threshold triggered by an event, a periodic trigger purpose, and the like can be obtained from a measurement configuration stored in the eNB through the identifier network; serving cell measurement quantities (reference signal received power, RSRP, and reference signal received quality, RSRQ); the measured neighbor cell list includes a physical cell identity, a value of a measurement quantity corresponding to the cell, a cell identity, a tracking area code, and a PLMN list. The PLMN of the eNB-endogenous cell and the PLMN of the handover target cell may be determined from the measurement report.
Specifically, according to the 23.251 protocol, selecting a PLMN of a handover target cell in the eNB, where the selection principle is to preferentially select an available cell supporting a current serving PLMN as the handover target cell; and if the available cell supporting the current service PLMN is not used as the handover target cell, selecting the available cell supporting the peer-to-peer PLMN or selecting one available cell as the handover target cell according to the configuration of the eNB side.
And 303, when the PLMN of the source cell is different from the PLMN of the handover target cell, the eNB performs intra-eNB inter-PLMN handover corresponding to the network sharing scenario of the eNB.
Specifically, the eNB determines whether the PLMN of the source cell is the same as the PLMN of the handover target cell according to the PLMN information determined by the measurement report. And when the PLMN of the source cell is different from the PLMN of the switching target cell, the eNB executes the intra-eNB inter-PLMN switching corresponding to the network sharing scene of the eNB, wherein the intra-eNB inter-PLMN switching comprises intra-eNB inter-PLMN switching under an MOCN sharing scene and intra-eNB inter-PLMN switching under a GWCN sharing scene. The intra-eNB inter-PLMN handover corresponding to the network sharing scenario of the eNB comprises a handover preparation stage and a handover execution stage, and different handover preparation stages and handover execution stages are executed under different network sharing scenarios.
According to the switching method of the inter-PLMN in the base station provided by the embodiment of the invention, the network sharing scene of the base station is predetermined, and the inter-PLMN in the base station corresponding to the network sharing scene is switched, so that the context information of the UE after the inter-PLMN in the base station is switched can be effectively updated to the MME, the service continuity is ensured, the problem that the prior art does not support the inter-PLMN in the base station is solved, the UE call drop caused by the inter-PLMN in the base station is reduced, and the flexibility, the universality and the stability of the application scene of the network sharing are improved.
Example four
An embodiment of the present invention provides a method for switching inter-PLMN in a base station, as shown in fig. 6, the method includes:
step 401, the eNB obtains a PLMN negotiation result of the core network, and determines that the network sharing scenario of the eNB is MOCN sharing according to the negotiation result.
Specifically, in an MOCN scenario, each MME may only support one individual PLMN, and according to a PLMN negotiation result of the core network, each MME may support one individual PLMN, and may determine that the network sharing scenario of the eNB is MOCN sharing. The PLMN negotiation process between the eNB and the core network may refer to embodiment one, and details of the embodiment of the present invention are not repeated herein.
Step 402, the eNB receives a measurement report reported by the UE, and determines the PLMN of the source cell and the PLMN of the handover target cell in the base station according to the measurement report.
Specifically, according to the 23.251 protocol, selecting a PLMN of a handover target cell in the eNB, where the selection principle is to preferentially select an available cell supporting a current serving PLMN as the handover target cell; and if the available cell supporting the current service PLMN is not used as the handover target cell, selecting the available cell supporting the peer-to-peer PLMN or selecting one available cell as the handover target cell according to the configuration of the eNB side.
Specifically, as shown in fig. 7, after receiving a measurement report reported by the UE, the source Cell1 of the eNB may determine, according to the measurement report, a PLMN of the source Cell of the eNB and a PLMN of the handover target Cell, where the measurement report includes information such as a measured neighbor Cell list including a physical Cell identifier, a value of a measurement amount corresponding to the Cell, a Cell identifier, a tracking area code, and a PLMN list.
Step 403, when the PLMN of the source cell is different from the PLMN of the handover target cell, the eNB sends a first handover request message to a source mobility management entity MME, where the first handover request message carries PLMN information of the handover target cell, so that the source MME determines a target MME according to the PLMN information of the handover target cell.
Specifically, the eNB determines whether the PLMN of the source cell and the PLMN of the handover target cell are the same according to the PLMN information determined by the measurement report, and when the PLMN of the source cell is different from the PLMN of the handover target cell, the eNB sends the first handover request message to the source mobility management entity MME. As shown in fig. 7, according to the Selected PLMN information of the Handover Target Cell2, the source Cell1 fills the Selected TAI of the Target ID of the first Handover request message Handover Required with the PLMN of the Handover Target Cell2, sets Direct Forwarding path availability as available, and according to the corresponding coupling information, the source Cell1 of the base station sends the first Handover request message Handover Required to the source mme (source mme). Then, the Source MME selects a corresponding Target MME according to the Selected TAI of the Target ID of the received handover required message, and sends a Forward location Request message to the Target MME (Target MME). After receiving the ForwardRelocation Request message, the Target MME performs a session establishment process with a Target serving gateway (Target SGW).
Step 404, the eNB receives a second handover request message sent by the target MME, where the second handover request message carries bearer information created by the target MME.
Specifically, as shown in fig. 7, on the corresponding SCTP association, the Handover Target Cell2 of the eNB receives a second Handover Request message Handover Request, where the Handover Request message carries bearer information created by the Handover Target MME.
Step 405, the eNB sends a handover request acknowledgement message to the target MME, where the handover request acknowledgement message indicates that the handover admission processing and preparation for the handover target cell are completed.
Specifically, as shown in fig. 7, after the Target Cell2 of the eNB performs admission processing for Handover and preparation for Handover, the Target Cell2 of the eNB sends a Handover request acknowledge message Handover request acknowledge to the Target MME. After the Target MME receives the Handover Request acknowledgement message, the Target MME replies a second migration Request message Forward Relocation Response to the Source MME.
Step 406, the eNB receives the handover command message sent by the source MME, and creates a first RRC connection reconfiguration message corresponding to the handover according to the handover command message.
Specifically, as shown in fig. 7, the Source Cell1 of the eNB receives a Handover Command message Handover Command sent by the Source MME, and after receiving the Handover Command message, indicates that the preparation for Handover across PLMNs in the eNB is completed.
Step 407, the eNB sends the first RRC connection reconfiguration message to the UE, where the first RRC connection reconfiguration message instructs the UE to perform random access in the handover target cell.
Specifically, as shown in fig. 7, the source Cell1 of the eNB creates a first RRC Connection Reconfiguration message RRC Connection Reconfiguration for corresponding Handover according to the received Handover Command message, and issues the RRC Connection Reconfiguration message to the UE through the UU interface. After receiving the RRC connection reconfiguration message for handover, the UE saves the corresponding parameters and triggers random access in the Cell2 of the handover target Cell.
Wherein, the RRC (radio Resource control) processes the third layer information of the control plane between the ue (user equipment) and the eNodeB (Evolved Node-B). The RRC allocates radio resources and sends related signaling, the main part of the control signaling between the UE and EUTRAN is RRC messages, which carry all the parameters needed to establish, modify and release layer and physical layer protocol entities.
Step 408, the eNB sends a first state transition message to the source MME.
Specifically, as shown in fig. 7, the Source Cell1 of the eNB sends a first state transition message eNB Status Transfer to the corresponding Source MME.
Step 409, the eNB receives the second state transition message sent by the target MME.
Specifically, as shown in fig. 7, the handover Target Cell2 of the eNB receives the second state transition message mmestatus Transfer sent by the Target MME, and performs a data back Transfer process.
Step 410, the eNB receives a first RRC connection reconfiguration complete message sent by the UE, where the first RRC connection reconfiguration complete message indicates that the UE has completed handover.
Specifically, as shown in fig. 7, after the synchronization of the handover target Cell2 is successful, the UE sends an RRC Connection Reconfiguration Complete message RRC Connection Reconfiguration Complete to the handover target Cell2, indicating that the UE is handed over. After the handover target Cell2 of the eNB receives the RRC Connection reconfiguration complete message reported by the UE, it is clear that the UE has completed the intra-station inter-PLMN handover.
Step 411, the eNB sends a handover notification message to the target MME, and updates the context information of the UE to the target MME according to the handover notification message.
Specifically, as shown in fig. 7, the Handover Target Cell2 of the eNB updates the context information related to the UE to the corresponding Target MME through a Handover notification message Handover notification. And after receiving the HandoverNotify message, the Target MME triggers the direct bearer modification of the Target MME and the Target SGW.
Step 412, the eNB receives a UE context release command sent by the source MME, where the UE context release command indicates release of the radio resource of the source cell and release of the UE context.
Specifically, as shown in fig. 7, the Source Cell1 of the eNB waits for the Source MME to initiate a UE context release command, and triggers the release of the radio resources related to the Source Cell1 and the UE context release process. And after the release of the relevant radio resources of the source Cell1 and the release of the UE context, the intra-eNB inter-PLMN handover is completed.
According to the switching method of the inter-PLMN in the base station provided by the embodiment of the invention, the network sharing scene of the base station is predetermined, and the inter-PLMN in the base station corresponding to the network sharing scene is switched, so that the context information of the UE after the inter-PLMN in the base station is switched can be effectively updated to the MME, the service continuity is ensured, the problem that the prior art does not support the inter-PLMN in the base station is solved, the UE call drop caused by the inter-PLMN in the base station is reduced, and the flexibility, the universality and the stability of the application scene of the network sharing are improved.
EXAMPLE five
An embodiment of the present invention provides a method for switching inter-PLMN in a base station, as shown in fig. 8, the method includes:
step 501, the eNB acquires a PLMN negotiation result of a core network, and determines that a network sharing scene of the eNB is GWCN sharing according to the negotiation result.
Specifically, in a GWCN scenario, each MME may support multiple PLMNs, and according to a PLMN negotiation result of a core network, each MME may determine that a network sharing scenario of the eNB is GWCN sharing by multiple individual PLMNs. The PLMN negotiation process between the eNB and the core network may refer to embodiment two, which is not described herein again in this embodiment of the present invention.
Step 502, the eNB receives a measurement report reported by the UE, and determines the PLMN of the source cell and the PLMN of the handover target cell in the base station according to the measurement report.
Specifically, as shown in fig. 9, after the source Cell1 of the eNB receives a measurement report reported by the UE, the measurement report includes information such as a measured neighbor Cell list including a physical Cell identifier, a value of a measurement quantity corresponding to the Cell, a Cell identifier, a tracking area code, and a PLMN list. The PLMN of the eNB-endogenous cell and the PLMN of the handover target cell may be determined from the measurement report. The PLMN of the handover target Cell2 in the eNB can be determined from the measurement report.
Specifically, according to the 23.251 protocol, selecting a PLMN of a handover target cell in the eNB, where the selection principle is to preferentially select an available cell supporting a current serving PLMN as the handover target cell; and if the available cell supporting the current service PLMN is not used as the handover target cell, selecting the available cell supporting the peer-to-peer PLMN or selecting one available cell as the handover target cell according to the configuration of the eNB side.
In step 503, when the PLMN of the source cell is different from the PLMN of the handover target cell, the eNB carries the PLMN information of the handover target cell selected by the UE to the handover target side cell in the base station.
Specifically, the eNB determines whether the PLMN of the source Cell is the same as the PLMN of the handover target Cell according to the PLMN information determined by the measurement report, and if the PLMN of the source Cell is different from the PLMN of the handover target Cell, as shown in fig. 9, the existing intra-eNB handover is used for preparation, and the intra-eNB source Cell1 carries the PLMN support information of the handover target Cell selected by the UE to the intra-eNB handover target Cell 2.
Step 504, the eNB sends a second RRC connection reconfiguration message to the UE, where the second RRC connection reconfiguration message instructs the UE to perform random access in the handover target cell.
Specifically, as shown in fig. 9, after the preparation for handover in the eNB is completed, the source Cell1 of the eNB sends a second RRC Connection Reconfiguration message RRC Connection Reconfiguration to the UE, and after the UE receives the RRC Connection Reconfiguration message, the UE saves the corresponding parameters and triggers random access in the handover target Cell 2.
Step 505, the eNB receives a second RRC connection reconfiguration complete message sent by the UE, where the second RRC connection reconfiguration complete message indicates that the UE has completed handover.
Specifically, as shown in fig. 9, after the UE succeeds in synchronizing the handover target Cell2, the handover target Cell2 of the base station receives an RRC Connection Reconfiguration Complete message RRC Connection Reconfiguration Complete, where the RRC Connection Reconfiguration Complete message indicates that the UE is completed to handover.
Step 506, the eNB sends a path switching request message to the MME, and updates the context information of the UE to the MME according to the path switching request message.
Specifically, as shown in fig. 9, after receiving the RRC Connection Reconfiguration Complete message reported by the UE, the handover target Cell2 of the eNB determines that the UE has completed intra-site inter-PLMN handover, and the handover target Cell2 updates the context information related to the UE to the MME through a Path Switch Request message Path Switch Request. And after the MME receives the Path Switch Request, carrying out a relevant ERAB bearing modification process.
Here, the ERAB (Evolved Radio Access Bearer) refers to a Bearer of a User plane, and is used for transmitting voice, data, and multimedia services between a UE (User Equipment) and a CN (Core Network).
Step 507, the eNB receives the path switching request response message sent by the MME, and updates the context information of the UE and releases the UE context according to the path switching request response message.
Specifically, as shown in fig. 9, the handover target Cell2 of the eNB receives the Path Switch Request Ack of the MME, and then the eNB performs the update procedure of the relevant UE context. After the handover target Cell2 of the eNB indicates the release of the UE context of the source Cell1 within the base station, the intra-eNB inter-PLMN handover is completed.
According to the switching method of the inter-PLMN in the base station provided by the embodiment of the invention, the network sharing scene of the base station is predetermined, and the inter-PLMN in the base station corresponding to the network sharing scene is switched, so that the context information of the UE after the inter-PLMN in the base station is switched can be effectively updated to the MME, the service continuity is ensured, the problem that the prior art does not support the inter-PLMN in the base station is solved, the UE call drop caused by the inter-PLMN in the base station is reduced, and the flexibility, the universality and the stability of the application scene of the network sharing are improved.
EXAMPLE six
An embodiment of the present invention provides a base station 1, as shown in fig. 10, where the base station 1 includes: an acquisition unit 10, a receiving unit 11, a switching unit 12; wherein,
an obtaining unit 10, configured to obtain a PLMN negotiation result of a core network, and determine a network sharing scenario of a base station according to the negotiation result, where the network sharing scenario of the base station includes multi-operator core network MOCN sharing and gateway core network GWCN sharing.
A receiving unit 11, configured to receive a measurement report sent by a user equipment UE, and determine, according to the measurement report, a PLMN of a source cell in a base station and a PLMN of a handover target cell.
The switching unit 12 is configured to execute inter-PLMN handover in the base station corresponding to the network sharing scenario of the base station when the PLMN of the source cell is different from the PLMN of the handover target cell.
Here, as shown in fig. 11, the base station 1 may further include a determining unit 13 configured to determine whether the PLMN of the source cell is the same as the PLMN of the handover target cell.
The switching unit 12 performs inter-PLMN handover in the base station corresponding to the network sharing scenario of the base station, including: a handover preparation phase and a handover execution phase.
Further, as shown in fig. 11, the base station 1 further includes a transmitting unit 14; if the network sharing scenario of the base station is MOCN sharing, in the handover preparation stage,
a sending unit 14, configured to send a first handover request message to a source mobility management entity MME, where the first handover request message carries PLMN information of the handover target cell, so that the source MME determines a target MME according to the PLMN information of the handover target cell; the target MME is also used for sending a switching request confirmation message to the target MME, wherein the switching request confirmation message indicates that the switching target cell is completed in switching admission processing and preparation;
a receiving unit 11, configured to receive a second handover request message sent by the target MME, where the second handover request message carries bearer information created by the target MME; and the source MME is also used for receiving a switching command message sent by the source MME and creating a first RRC connection reconfiguration message corresponding to the switching according to the switching command message.
Further, if the network sharing scenario of the base station is MOCN sharing, performing inter-PLMN handover in the base station under the MOCN sharing scenario, at the handover execution stage,
a sending unit 14, configured to send the first RRC connection reconfiguration message to the UE, where the first RRC connection reconfiguration message instructs the UE to perform random access in the handover target cell; further configured to send a first state transition message to the source MME; the UE is also used for sending a switching notification message to the target MME and updating the context information of the UE to the target MME according to the switching notification message;
a receiving unit 11, configured to receive a second state transition message sent by the target MME; the UE is further configured to receive a first RRC connection reconfiguration complete message sent by the UE, where the first RRC connection reconfiguration complete message indicates that the UE has completed handover; and the UE is further configured to receive a release order sent by the source MME, where the release order indicates release of radio resources of the source cell and release of the UE context.
Further, as shown in fig. 11, the base station further includes a transmitting unit 14; if the network sharing scenario of the base station is GWCN sharing, in the handover preparation phase,
a sending unit 14, configured to carry the PLMN information of the handover target cell selected by the UE to a handover target cell in a base station.
Further, if the network sharing scenario of the base station is GWCN sharing, in the handover execution phase,
a sending unit 14, configured to send a second RRC connection reconfiguration message to the UE, where the second RRC connection reconfiguration message instructs the UE to perform random access in the handover target cell; the UE is also used for sending a path switching request message to an MME and updating the context information of the UE to the MME according to the path switching request message;
a receiving unit 11, configured to receive a second RRC connection reconfiguration complete message sent by the UE, where the second RRC connection reconfiguration complete message indicates that the UE has completed handover; and the UE is further configured to receive a path switching request response message sent by the MME, and update context information of the UE and release the UE context according to the path switching request response message.
In practical applications, the acquiring unit 10, the receiving unit 11, the judging unit 13, the switching unit 12, and the sending unit 14 may be implemented by a Central Processing Unit (CPU), a microprocessor unit (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like located on the base station.
Specifically, for understanding of the base station provided in the embodiment of the present invention, reference may be made to the description of the method for switching across PLMNs in the base station in the third to fifth embodiments, and details of this embodiment are not repeated herein.
The embodiment of the invention provides a base station, which is characterized in that a network sharing scene of the base station is predetermined, inter-base station PLMN switching processing corresponding to the network sharing scene is carried out, UE context information after inter-base station PLMN switching can be effectively updated to an MME, service continuity is ensured, the problem that the prior art does not support the inter-base station PLMN scene is solved, UE call drop caused by inter-base station PLMN switching is reduced, and the flexibility, the universality and the stability of the application scene of network sharing are improved.
The embodiment of the invention also provides a communication system which comprises the user equipment, the core network and the base station, wherein the communication system performs the inter-PLMN switching processing in the base station corresponding to the network sharing scene through predetermining the network sharing scene of the base station, can effectively update the UE context information after the inter-PLMN switching in the station to the MME, ensures the service continuity, solves the problem that the prior art does not support the inter-PLMN scene in the base station, and reduces the UE call drop caused by the inter-PLMN switching in the base station, thereby improving the flexibility, the universality and the stability of the application scene of the network sharing.
It should be noted that, for the signaling transmission related to the first to fifth embodiments of the present invention, reference may be made to protocols 3GPP TS36.331, 3GPP TS36.413, 3GPP TS36.423, 3GPP TS 23.251, and 3GPP TS 23.401.
It should be noted that, the method for switching between PLMNs in a base station, the base station, and the communication system provided in the embodiment of the present invention are only described with reference to the LTE communication system as an example, but not limited thereto, and the method for switching between PLMNs in a base station, the base station, and the communication system are all within the scope of the present invention.
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 a hardware embodiment, a 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.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (11)

1. A method for switching between cross PLMNs in a base station is characterized by comprising the following steps:
acquiring a PLMN negotiation result of a core network, and determining a network sharing scene of a base station according to the negotiation result, wherein the network sharing scene of the base station comprises multi-operator core network MOCN sharing and gateway core network GWCN sharing;
receiving a measurement report sent by User Equipment (UE), and determining a Public Land Mobile Network (PLMN) of a source cell and a PLMN of a switching target cell in a base station according to the measurement report;
when the PLMN of the source cell is different from the PLMN of the switching target cell, executing inter-PLMN switching in the base station corresponding to the network sharing scene of the base station;
the inter-PLMN handover in the base station corresponding to the network sharing scenario of the base station includes: a handover preparation phase and a handover execution phase.
2. The inter-base-station PLMN switching method according to claim 1, wherein the network sharing scenario of said base station is MOCN sharing, and the inter-base-station PLMN switching under the MOCN sharing scenario is executed; the handover preparation phase comprises:
sending a first switching request message to a source Mobile Management Entity (MME), wherein the first switching request message carries PLMN information of a switching target cell, so that the source MME determines a target MME according to the PLMN information of the switching target cell;
receiving a second switching request message sent by the target MME, wherein the second switching request message carries the bearer information created by the target MME;
sending a handover request acknowledgement message to the target MME, wherein the handover request acknowledgement message indicates that the handover target cell completes handover admission processing and preparation;
and receiving a switching command message sent by the source MME, and creating a first RRC connection reconfiguration message corresponding to the switching according to the switching command message.
3. The inter-base-station PLMN switching method according to claim 2, wherein the network sharing scenario of the base station is MOCN sharing, and the inter-base-station PLMN switching under the MOCN sharing scenario is performed; the handover execution phase comprises:
sending the first RRC connection reconfiguration message to the UE, wherein the first RRC connection reconfiguration message indicates the UE to execute random access in the switching target cell;
sending a first state transition message to the source MME;
receiving a second state transition message sent by the target MME;
receiving a first RRC connection reconfiguration complete message sent by the UE, wherein the first RRC connection reconfiguration complete message indicates that the UE is switched completely;
sending a switching notification message to the target MME, and updating the context information of the UE to the target MME according to the switching notification message;
and receiving a UE context release command sent by the source MME, wherein the UE context release command indicates the release of the radio resources of the source cell and the release of the UE context.
4. The inter-base-station PLMN switching method according to claim 1, wherein the network sharing scenario of said base station is GWCN sharing, and the inter-base-station PLMN switching under the GWCN sharing scenario is executed; the handover preparation phase comprises:
and carrying the PLMN information of the switching target cell selected by the UE to a switching target side cell in a base station.
5. The inter-base-station PLMN switching method according to claim 4, wherein the network sharing scenario of said base station is GWCN sharing, and the inter-base-station PLMN switching under the GWCN sharing scenario is executed; the handover execution phase comprises:
sending a second RRC connection reconfiguration message to the UE, wherein the second RRC connection reconfiguration message indicates the UE to execute random access in the switching target cell;
receiving a second RRC connection reconfiguration complete message sent by the UE, wherein the second RRC connection reconfiguration complete message indicates that the UE is switched completely;
sending a path switching request message to an MME, and updating the context information of the UE to the MME according to the path switching request message;
and receiving a path switching request response message sent by the MME, and updating the context information of the UE and releasing the UE context according to the path switching request response message.
6. A base station, characterized in that the base station comprises: the device comprises an acquisition unit, a receiving unit and a switching unit; wherein,
the acquiring unit is used for acquiring a PLMN negotiation result of a core network and determining a network sharing scene of a base station according to the negotiation result, wherein the network sharing scene of the base station comprises multi-operator core network MOCN sharing and gateway core network GWCN sharing;
the receiving unit is used for receiving a measurement report sent by User Equipment (UE), and determining a Public Land Mobile Network (PLMN) of a source cell and a PLMN of a handover target cell in a base station according to the measurement report;
the switching unit is configured to execute inter-PLMN handover within the base station corresponding to a network sharing scenario of the base station when the PLMN of the source cell is different from the PLMN of the handover target cell;
the switching unit executes inter-PLMN switching in the base station corresponding to the network sharing scene of the base station, and comprises: a handover preparation phase and a handover execution phase.
7. The base station of claim 6, wherein the base station further comprises: a transmitting unit; if the network sharing scenario of the base station is MOCN sharing, in the handover preparation stage,
the sending unit is configured to send a first handover request message to a source mobility management entity MME, where the first handover request message carries PLMN information of the handover target cell, so that the source MME determines a target MME according to the PLMN information of the handover target cell; the target MME is also used for sending a switching request confirmation message to the target MME, wherein the switching request confirmation message indicates that the switching target cell is completed in switching admission processing and preparation;
the receiving unit is configured to receive a second handover request message sent by the target MME, where the second handover request message carries bearer information created by the target MME; and the source MME is also used for receiving a switching command message sent by the source MME and creating a first RRC connection reconfiguration message corresponding to the switching according to the switching command message.
8. The base station of claim 7, wherein if the network sharing scenario of the base station is MOCN sharing, performing inter-PLMN handover in the base station under the MOCN sharing scenario, and in the handover performing stage,
the sending unit is configured to send the first RRC connection reconfiguration message to the UE, where the first RRC connection reconfiguration message instructs the UE to perform random access in the handover target cell; further configured to send a first state transition message to the source MME; the UE is also used for sending a switching notification message to the target MME and updating the context information of the UE to the target MME according to the switching notification message;
the receiving unit is configured to receive a second state transition message sent by the target MME; the UE is further configured to receive a first RRC connection reconfiguration complete message sent by the UE, where the first RRC connection reconfiguration complete message indicates that the UE has completed handover; and the UE is further configured to receive a release order sent by the source MME, where the release order indicates release of radio resources of the source cell and release of the UE context.
9. The base station of claim 6, wherein the base station further comprises a transmitting unit; if the network sharing scenario of the base station is GWCN sharing, in the handover preparation phase,
and the sending unit is used for carrying the PLMN information of the handover target cell selected by the UE to a handover target side cell in a base station.
10. The base station of claim 9, wherein if the network sharing scenario of the base station is GWCN sharing, in the handover performing stage,
the sending unit is configured to send a second RRC connection reconfiguration message to the UE, where the second RRC connection reconfiguration message instructs the UE to perform random access in the handover target cell; the UE is also used for sending a path switching request message to an MME and updating the context information of the UE to the MME according to the path switching request message;
the receiving unit is configured to receive a second RRC connection reconfiguration complete message sent by the UE, where the second RRC connection reconfiguration complete message indicates that the UE has completed handover; and the UE is further configured to receive a path switching request response message sent by the MME, and update context information of the UE and release the UE context according to the path switching request response message.
11. A communication system, the communication system comprising: user equipment, a core network and a base station according to any of claims 6 to 10.
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