WO2008092408A1 - Method, device and system for establishing s1 signaling connection in evolved network - Google Patents

Method, device and system for establishing s1 signaling connection in evolved network Download PDF

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Publication number
WO2008092408A1
WO2008092408A1 PCT/CN2008/070210 CN2008070210W WO2008092408A1 WO 2008092408 A1 WO2008092408 A1 WO 2008092408A1 CN 2008070210 W CN2008070210 W CN 2008070210W WO 2008092408 A1 WO2008092408 A1 WO 2008092408A1
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WO
WIPO (PCT)
Prior art keywords
signaling connection
enodeb
epc
handover
connection parameter
Prior art date
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PCT/CN2008/070210
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English (en)
French (fr)
Inventor
Hongzhuo Zhang
Yong Qiu
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Huawei Technologies Co., Ltd.
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=39673677&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2008092408(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP08706587.6A priority Critical patent/EP2079250B2/en
Priority to ES08706587.6T priority patent/ES2417487T5/es
Priority to EP18195166.6A priority patent/EP3448074B1/en
Priority to EP17156171.5A priority patent/EP3203777B1/en
Priority to PL18195166T priority patent/PL3448074T3/pl
Publication of WO2008092408A1 publication Critical patent/WO2008092408A1/zh
Priority to US12/466,628 priority patent/US8363619B2/en
Priority to US13/731,270 priority patent/US10172042B2/en
Priority to US13/931,225 priority patent/US8842638B2/en
Priority to US16/208,584 priority patent/US11129058B2/en

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Classifications

    • 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
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data
    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/13—Cell handover without a predetermined boundary, e.g. virtual cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/045—Interfaces between hierarchically different network devices between access point and backbone network device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for establishing an S1 signaling connection in an evolved network.
  • the S1 interface is eUTRAN (Evolved Radio Access Network) and CN
  • the interface between the Node (the core network node, including the MME/UPE), which is divided into the control plane interface S1-C P and the user plane interface S1-UP.
  • the SI-CP is the interface between eUTRAN and MME (control plane entity)
  • S1-UP is the interface between eUTRAN and UPE (user plane entity).
  • the application part is the S1 control plane interface application part protocol.
  • SCTP Stream Control Transmission Protocol
  • the protocol stack of the S1-CP interface is shown in Figure 1.
  • the SI signaling connection identifier can be assigned by the entity that initiated the establishment of the NAS signaling connection.
  • the SI signaling connection identifier can be assigned by the entity that initiated the establishment of the NAS signaling connection.
  • the S1 signaling Transmitting the SI signaling connection identifier to the opposite node in the first NAS message on the connection, for example, including the S1 signaling connection identifier in the S1 application layer signaling message initial UE message Initial UE
  • the eNodeB entity is delivered to the MME, and the eNodeB and the MME need to save the S1 signaling connection identifier in the period in which the SI signaling connection exists;
  • the eNodeB and the MME respectively allocate communication instances for the newly established S1 signaling connection, and the S1 signaling connection is coupled by SCTP associations and SCTP streams (SCTP)
  • the eNodeB When the eRANAP communication entity of the eNodeB needs to send a message to the eRANAP communication entity of the MME, the eNodeB adds the S1 signaling connection identifier to the PPI field of each SCTP data block, and then sends the message to the MME entity through the SCTP protocol. ;
  • the MME entity correctly routes the message to the communication instance of the S1 signaling connection according to the PPI field in each SCTP data block.
  • Method 2 As shown in FIG. 2, an eNodeB and an MME are respectively assigned a communication context identifier (MME communication context identifier), and the eNodeB or MME entity carries a corresponding communication context identifier in each application layer signaling message.
  • the peer application layer signaling entity routes the signaling message to the correct communication entity according to the communication context identifier.
  • an S1 signaling connection between the target eNodeB and the EPC needs to be established to implement the connection between the target eNodeB and the EPC.
  • the embodiment of the invention provides a method, a device and a system for establishing an S1 signaling connection in an evolved network, which solves the problem that the S1 signaling connection cannot be established between the target eNodeB and the EPC after the handover is completed in the prior art.
  • the embodiments of the present invention are implemented by the following technical solutions:
  • An embodiment of the present invention provides a method for sending S1 signaling connection parameter information, including:
  • the source evolved base station eNodeB sends a handover request message carrying the S1 signaling connection parameter information of the source eNodeB to the target eNodeB, and initiates a handover procedure of the user equipment UE to the target eNodeB.
  • An embodiment of the present invention provides a method for establishing an S1 signaling connection in an evolved network, including:
  • An embodiment of the present invention provides an evolved base station, including:
  • S1 signaling connection parameter allocation module configured to allocate an S1 signaling connection parameter of the eNodeB and the EPC to the UE;
  • S1 signaling connection identifier information sending module 2 configured to send the received S1 signaling connection parameter And the S1 signaling connection parameter allocated by the S1 signaling connection parameter allocation module is sent to the EPC.
  • An embodiment of the present invention provides a system for establishing an SI signaling connection in an evolved network, including:
  • At least two evolved base stations eNodeB including a source eNodeB and a target eNodeB,
  • the source eNodeB includes:
  • S1 signaling connection parameter sending module one configured to send the original S1 signaling connection parameter of the source eNodeB and the EPC to the target eNodeB;
  • the target eNodeB includes:
  • an S1 signaling connection parameter allocation module configured to allocate an S1 signaling connection parameter of the eNodeB and the EPC to the UE;
  • an S1 signaling connection identifier information sending module 2 configured to send the received source eNodeB and the EPC The original S1 signaling connection parameter and the S1 signaling connection parameter of the target eNodeB and the EPC allocated by the S1 signaling connection parameter allocation module are sent to the EPC.
  • the embodiment of the present invention adds the S1 signaling connection parameter, such as the S1 signaling connection identifier or the communication context identifier, in the message of the handover process, so that the UE is performing.
  • the target eNodeB can establish an S1 signaling connection with the EPC according to the S1 signaling connection parameter, which effectively solves the problem that the target eNodeB cannot establish S1 signaling with the EP C after the Intra-LTE handover is performed by the prior art UE.
  • the problem with the connection is performed by the prior art UE.
  • FIG. 1 is a structural diagram of a protocol stack of a prior art S1-CP interface
  • FIG. 2 is a schematic diagram of the use of the prior art communication context identifier
  • FIG. 3 is a flow chart of prior art switching
  • FIG. 5 is a flowchart of Embodiment 1 of Embodiment 1 of the present invention.
  • FIG. 6 is a flowchart of Embodiment 2 of Embodiment 1 of the present invention
  • FIG. Figure 7 is a flowchart of Embodiment 2 of the present invention
  • FIG. 8 is a flowchart of Embodiment 1 of Embodiment 2 of the present invention.
  • FIG. 9 is a flowchart of Embodiment 2 of Embodiment 2 of the present invention.
  • FIG. 10 is a schematic structural diagram of a system according to an embodiment of the present invention.
  • intra-LTE intra-LTE handover
  • the HO) process is shown in Figure 3 and includes the following steps:
  • Step 301 The UE context in the source eNodeB includes roaming restriction information, and the source eNodeB entity configures the measurement control process of the UE according to the roaming restriction information.
  • the roaming restriction information is provided after the connection establishment or the last TA (tracking area) update, and the source eNo deB provides measurement information to the UE, which helps control the connection movement process of the UE.
  • Step 302 The UE triggers the reporting of the measurement report according to the specified rule.
  • the UE may report the measurement report to the source eNodeB according to a specified rule, such as system information.
  • Step 303 The source eNodeB decides to switch the UE to a cell controlled by the target eNodeB after the UE performs handover according to the measurement report reported by the UE and the RRM (Radio Resource Management) information of the source eNodeB.
  • RRM Radio Resource Management
  • Step 304 The source eNodeB sends a handover request to the target eNodeB. HANDOVER
  • the information includes: an X2 signaling context reference of the UE at the source eNodeB, and an EPC (Evolved Packet Core) of the UE at the S1 interface Signaling context reference, target cell identity, RRC (Radio Resource Control Protocol context, SAE bearer context.
  • EPC Evolved Packet Core
  • the target eNodeB addresses the source eNodeB and EPC with the S1/X2 signaling connection reference of the UE.
  • the SAE bearer context includes: address information of the radio network layer and the transport network layer required for the target eNodeB handover preparation, the quality of service profile of the SAE bearer, and possible access layer configuration information, resources required for the target eNodeB configuration.
  • Step 305 The target eNodeB completes the admission control according to the received SAE bearer service quality profile to improve the possibility of successful handover;
  • Step 306 The target eNodeB sends a handover request response HANDOVER REQUEST to the source eNodeB.
  • the source eNodeB receives the handover request response HANDOVER REQUEST
  • the COMMAND message is set to the UE, and the start timer is started;
  • the ACKNOLEDGE message contains the newly allocated C-RNTI and other possible parameters, such as: access parameters
  • the COMMAND message contains: the newly assigned C-RNTI, the possible start time, and the SI of the target eNodeB.
  • Step 307 After receiving the handover command sent by the source eNodeB entity, the UE starts to perform the handover process.
  • the UE After the COMMAND starts to exceed the quota, the UE completes the synchronization process with the target eNodeB, and then acquires the uplink inter-turn advance amount;
  • Step 309 The network responds with an assigned advance amount of the uplink
  • Step 310 Once the target cell is successfully accessed, the UE goes to the target eNodeB.
  • the CONFIRM message indicates that the handover is completed, and the target eNodeB checks whether the C-RNTI in the message is allocated by itself for confirmation;
  • Step 311 Target eNodeB sends handover completion to EPC HANDOVER
  • the EPC switches the data route to the target eNodeB and releases the resources of the source eNodeB related user plane and the transport network layer;
  • Step 312 The EPC sends a handover completion response to the target eNodeB.
  • Step 313 Target eNodeB sends resource release to source eNodeB RELEASE
  • Step 314 Receive the resource release RELEASE
  • the source eNodeB releases the resources of the radio resource and control plane associated with the UE context.
  • the embodiment of the present invention implements a new S1 signaling connection between the target eNodeB and the EPC after the handover is completed by carrying S1 signaling connection parameters, such as S1 signaling connection identification information or communication context identification information, in some messages in the handover process. the process of.
  • the handover request sent by the source eNodeB to the target eNodeB is HANDOVER.
  • the current S1 signaling connection identifier information that is, the original S1 signaling connection identifier information is added, and the current S1 signaling connection identifier information includes: the source eNodeB and the S1 signaling connection identifier used before the EPC handover, and the same Optional includes SCTP coupled identification and SCTP flow identification.
  • the COMPLETE message carries the original S1 signaling connection identification information and the new S1 signaling connection identifier, and the same carries the HAANDOVER.
  • the new S1 signaling connection identification information is used in the SCTP message of the COMPLETE message.
  • the new S1 signaling connection identification information includes: an SCTP coupled identifier (optional), an SCTP flow identifier (optional), and an S1 signaling connection identifier.
  • the COMPLETE message before the EPC entity sends a handover completion response HO COMPLETE ACK message to the target eNodeB, creates a new communication instance, and saves the HANDOVER.
  • the new S1 signaling connection identifier information carried in the COMPLETE message, and the EPC searches for the original communication instance according to the original S1 signaling connection identification information, so that the target eNodeB establishes an S1 signaling connection with the EPC.
  • Step 501 The UE context in the source eNodeB includes roaming restriction information, and the source eNodeB entity is configured according to [77]
  • the roaming restriction information is provided after the connection establishment or the last TA (Tracking Area) update, and the source eNo deB provides measurement information to the UE, which helps control the connection movement process of the UE.
  • Step 502 The UE triggers the reporting of the measurement report according to the specified rule.
  • the UE may report the measurement report to the source eNodeB according to a specified rule, such as system information.
  • Step 503 The source eNodeB determines, according to the measurement report reported by the UE and the RRM (Radio Resource Management) information of the source eNodeB, that the UE needs to perform handover, and decides to switch the UE to a cell controlled by the target eNodeB.
  • RRM Radio Resource Management
  • Step 504 The source eNodeB sends a handover request to the target eNodeB. HANDOVER
  • the information required for the handover preparation includes: an X2 signaling context reference of the UE at the source eNodeB, and an EPC of the UE at the S1 interface (evolution) Signaling context reference, target cell identity, RRC (Radio Resource Control Protocol) context, SAE bearer context, original S1 signaling connection identification information.
  • the original S1 signaling connection identifier information includes: an S1 signaling connection identifier used before the source eNodeB and the EPC switch.
  • the peers optionally include an SCTP coupled identifier and an SCTP flow identifier.
  • the target eNodeB addresses the source eNodeB and EPC with the S1/X2 signaling connection reference of the UE.
  • the SAE bearer context includes: target address information of the radio network layer and the transport network layer required for the eNodeB handover preparation
  • the service quality profile of the SAE bearer and the possible access layer configuration information, and the target eNodeB configures the required resources.
  • Step 505 The target eNodeB completes the admission control according to the received SAE bearer service quality profile, so as to improve the possibility of successful handover;
  • the target eNodeB can allocate a corresponding C-RNTI according to the received SAE bearer service quality profile if it can meet the resource requirements of the SAE bearer;
  • Step 506 The target eNodeB sends a handover request response to the source eNodeB HANDOVER REQUEST
  • the source eNodeB receives the handover request response HANDOVER REQUEST
  • the COMMAND message is set to the UE, and the start timer is started;
  • the ACKNOLEDGE message contains the newly allocated C-RNTI and other possible parameters, such as: access parameters Establish RNL/TNL information for forwarding tunnels, etc.
  • the COMMAND message contains: the newly assigned C-RNTI, the possible start time, and the SI of the target eNodeB.
  • Step 507 After receiving the handover command sent by the source eNodeB entity, the UE starts to perform the handover process.
  • the UE After the COMMAND starts to exceed the quota, the UE completes the synchronization process with the target eNodeB, and then acquires the uplink inter-turn advance amount;
  • Step 509 The network responds with an assigned upstream inter-turn advance
  • Step 510 Once the target cell is successfully accessed, the UE goes to the target eNodeB.
  • the CONFIRM message indicates that the handover is completed, and the target eNodeB checks whether the C-RNTI in the message is allocated by itself for confirmation;
  • Step 511 Target eNodeB sends handover completion to MME HANDOVER
  • the MME is an entity in the EPC, responsible for the mobility management of the control plane, including user context and mobile state management, assigning Linyi identity, etc.;
  • the target eNodeB allocates new S1 signaling connection identifier information, and the new S1 signaling connection identifier information includes an S1 signaling connection identifier, and optionally includes an SCTP coupling identifier and an SCTP flow identifier.
  • the COMPLETE message carries the new SI signaling connection identifier information and the original SI signaling connection identifier information.
  • the UPE switches the data route to the target eNodeB, and releases the resources of the source eNodeB and the transport network layer;
  • the UEP is an entity in the EPC, and is responsible for initiating paging for downlink data in idle state, managing and storing IP bearer parameters and routing information in the network.
  • MME received the above HANDOVER After the COMPLETE message, a new communication instance is created, and the new S1 signaling connection identifier information carried in the HANDOVER COMPLETE message is saved, and the MME searches for the original communication instance according to the original S1 signaling connection identification information. Step, not shown in the figure;
  • Step 511a The MME sends a re-routing request message to the UPE, requesting the UPE to perform user plane routing update.
  • Step 511b The UPE sends a re-routing response message to the MME, indicating that the user plane routing update is completed.
  • Step 512 The MME sends a handover complete response to the target eNodeB.
  • Step 513 Target eNodeB sends resource release to source eNodeB RELEASE
  • Step 514 Receive the above resource release RELEASE
  • the source eNodeB releases the radio resource and control plane resources related to the UE context.
  • the foregoing embodiment carries the original S1 signaling connection identifier information in the handover request message in the handover process, and carries the S1 signaling connection identifier information newly allocated by the target eNodeB and the original S1 signaling connection identifier in the handover complete message.
  • the information is that, after the UE is handed over to the target cell, the S1 signaling connection between the EPC and the target eNodeB can be established according to the original S1 signaling connection identifier information and the new S1 signaling connection identifier information.
  • Step 611 of the embodiment includes:
  • Target eNodeB sends handover completion to UPE HANDOVER
  • the COMPLETE message notifies the UPE that the UE has replaced the cell, and establishes an S1 signaling connection;
  • UEP is an entity in the EPC. It is responsible for initiating paging for downlink data in idle state, managing and storing IP bearer parameters and routing information within the network.
  • the target eNodeB allocates new S1 signaling connection identifier information, where the new S1 signaling connection identifier information includes an S1 signaling connection identifier, and optionally includes an SCTP coupled identifier and an SCTP flow identifier;
  • the COMPLETE message carries the new SI signaling connection identifier information and the original SI signaling connection identifier information.
  • the UPE switches the data route to the target eNodeB and releases the resources of the user plane and the transport network layer associated with the source eNodeB.
  • Step 611a UPE receives the above HANDOVER
  • the route update request message is sent to the MME to notify the MME that the user plane route has been updated, and the route update request message carries the new S1 signaling connection identifier information and the original S1 signaling connection identifier information;
  • the MME After receiving the routing update request message, the MME creates a new communication instance, and saves the new S1 signaling connection identifier information carried in the routing update message.
  • the MME searches for the original communication instance according to the original S1 signaling connection identifier information, and the step is an optional step, which is not shown in the figure;
  • Step 611b After the foregoing operation is completed, the MME sends a route update response message to the UPE.
  • the original control plane entity communication context identifier (MME) is added in the HANDO VER REQUEST message sent by the source eNodeB to the target eNodeB.
  • eNodeB Communication Context Identifier optionally increasing the source eNodeB communication context identifier (eNodeB Communication Context Identifier);
  • the target eNodeB separates the new eNodeB Communication Context Identifier, and the handover sent to the EPC by the target eNodeB is completed.
  • the COMPLETE message carries the original control plane entity communication context identifier and the new eNodeB communication context identifier, optionally adding a source eNodeB communication context identifier;
  • the EPC entity After the COMPLETE message, the EPC entity creates a new communication instance before sending the handover completion response HO COMPLETE ACK message to the target eNodeB, and saves the HANDOVER.
  • the new eNodeB communication context identifier carried in the COMPLETE message The EPC searches for the original communication instance according to the original control plane entity communication context identifier;
  • EPC assigns a new control plane entity communication context identifier (MME Communication Context
  • the COMPLETE ACK message is sent to the target eNodeB.
  • a specific implementation of the second embodiment, as shown in FIG. 8, includes the following steps:
  • Step 801 The UE context in the source eNodeB includes roaming restriction information, and the source eNodeB entity configures the measurement control process of the UE according to the roaming restriction information.
  • the above roaming restriction information is provided after the connection is established or after the last TA (tracking area) update, source e
  • the NodeB provides measurement information to the UE, which helps control the connection movement process of the UE.
  • Step 802 The UE triggers the reporting of the measurement report according to the specified rule.
  • the UE may report the measurement report to the source eNodeB according to a specified rule, such as system information.
  • Step 803 The source eNodeB determines, according to the measurement report reported by the UE and the RRM (Radio Resource Management) information of the source eNodeB, that the UE needs to perform handover, and decides to switch the UE to a cell controlled by the target eNodeB.
  • RRM Radio Resource Management
  • Step 804 The source eNodeB sends a handover request to the target eNodeB HANDOVER
  • the REQUEST message the information required to carry the target eNodeB handover preparation in the handover request message; [130]
  • the information required for the handover preparation includes: the X2 signaling context reference of the UE in the source eNodeB, and the EPC of the UE on the S1 interface ( Signaling context reference, target cell identity, RRC (Radio Resource Control Protocol) of the evolved packet core)
  • the target eNodeB addresses the source eNodeB and EPC with the S1/X2 signaling connection reference of the UE.
  • the foregoing SAE bearer context includes: address information of the radio network layer and the transport network layer required for the target eNodeB handover preparation, the quality of service profile of the SAE bearer, and possible access layer configuration information, and the target eNodeB configures the required resources.
  • Step 805 The target eNodeB completes the admission control according to the received SAE bearer service quality profile.
  • the target eNodeB can meet the resource requirements of the SAE bearer, allocate the corresponding resource according to the received SAE bearer service quality profile, and reserve a C-RNTI;
  • Step 806 The target eNodeB sends a handover request response to the source eNodeB. HANDOVER REQUEST
  • the source eNodeB receives the handover request response HANDOVER REQUEST
  • the COMMAND message is set to the UE, and the start timer is started;
  • the ACKNOLEDGE message includes the newly allocated C-RNTI and other possible parameters, such as: access parameters, RNL/TNL information for establishing a forwarding tunnel, and the like;
  • the COMMAND message contains: the newly assigned C-RNTI, the possible start time, and the SI of the target eNodeB.
  • Step 807 After receiving the handover command sent by the source eNodeB entity, the UE starts to perform the handover process.
  • the UE After the COMMAND starts to exceed the quota, the UE completes the synchronization process with the target eNodeB, and then acquires the uplink inter-turn advance amount;
  • Step 809 The network responds with an assigned upstream inter-turn advance
  • Step 810 Once the target cell is successfully accessed, the UE goes to the target eNodeB.
  • the CONFIRM message indicates that the handover is completed, and the target eNodeB checks whether the C-RNTI in the message is allocated by itself for confirmation;
  • Step 811 Target eNodeB sends handover completion to MME HANDOVER
  • Target eNodeB separates new eNodeB communication context identifier (eNodeB Communication Context)
  • the COMPLETE message carries the original control plane entity communication context identifier and the new eNodeB communication context identifier, and optionally carries the source eNodeB communication context identifier;
  • UPE switches data routing to the target eNodeB and releases the user plane and transport network associated with the source eNodeB Network resources;
  • the MME searches for the original communication instance according to the original control plane entity communication context identifier, and the step is an optional step, which is not shown in the figure;
  • Step 811a the MME sends a re-routing request message to the UPE, requesting the UPE to perform user plane routing update.
  • Step 811b The UPE sends a re-routing response message to the MME, indicating that the user plane routing update is completed.
  • Step 812 The MME sends a handover complete response to the target eNodeB.
  • the MME may allocate a new control plane entity communication context identifier, and carry the new control plane entity communication context identifier in the HO COMPLETE ACK message;
  • Step 813 Target eNodeB sends resource release to source eNodeB RELEASE
  • Step 814 Receive the above resource release RELEASE
  • the source eNodeB releases the radio resource and control plane resources related to the UE context.
  • the above embodiment carries the original control plane entity communication context identifier in the handover request message in the handover process, and carries the communication context identifier newly allocated by the target eNodeB and the original control plane entity communication context identifier in the handover completion message.
  • the S1 signaling connection between the EPC and the target cell can be established according to the original S1 signaling connection identifier information and the new S1 signaling connection identifier information.
  • FIG. 9 Another embodiment of the second embodiment of the present invention is shown in FIG. 9. The difference from the embodiment of the second embodiment is the step 911.
  • the step 911 of the embodiment includes:
  • Step 911 Target eNodeB sends handover completion to UPE HANDOVER
  • the COMPLETE message notifies the UPE that the UE has replaced the cell and establishes an S1 signaling connection
  • Target eNodeB separates new eNodeB communication context identifier (eNodeB Communication Context) Identifier); and in the HANDOVER
  • the COMPLETE message carries the original control plane entity communication context identifier and the new eNodeB communication context identifier, and optionally carries the source eNodeB communication context identifier;
  • the UPE switches the data route to the target eNodeB, and releases the resources of the source eNodeB related user plane and the transport network layer;
  • Step 911a UPE received the above HANDOVER
  • the MME After the COMPLETE message, the MME sends a route update request message to notify the MME that the user plane route has been updated, and the route update request message carries the original control plane entity communication context identifier and the new eNodeB communication context identifier.
  • the MME After receiving the routing update request message, the MME creates a new communication instance, and saves the new eNodeB communication context identifier carried in the route update request message.
  • the MME searches for the original communication instance according to the original control plane entity communication context identifier, and the step is an optional step, which is not shown in the figure;
  • Step 911b The MME allocates a new control plane entity communication context identifier, and sends a route update response message carrying the newly allocated control plane entity communication context identifier to the UPE.
  • Step 12 UPE sends a handover completion response to the target eNodeB HO COMPLETE
  • the handover completion response message may carry the newly allocated control plane entity communication context identifier
  • a further embodiment of the present invention provides an S1 signaling connection establishment system in an evolved network.
  • the system implementation is as shown in FIG. 10, and includes:
  • At least two evolved base stations eNodeB where the eNodeB is a source eNodeB that performs handover as a UE, and is configured with:
  • an S1 signaling connection parameter allocation module configured to allocate, to the UE, an S1 signaling connection parameter of the eNodeB and the EPC;
  • the S1 signaling connection parameter includes: an S1 signaling connection identifier or an MME/eNodeB communication context identifier
  • the SI signaling connection parameter sending module 1 is configured to send the original SI signaling connection parameter to the target eNodeB, that is, send the S1 signaling connection parameter of the source eNodeB and the EPC allocated by the S1 signaling connection parameter allocation module to the target to the target
  • the S1 signaling connection parameter may be included in the S1 signaling connection identifier information in the PPI field in the SCTP protocol packet header, and carried in the handover request message for transmission;
  • the S1 signaling connection identifier information is the same
  • the SCTP coupled identifier and the SCTP flow identifier are included; or the MME communication context identifier and the eNodeB communication context identifier are
  • the eNodeB is configured as a target eNodeB for handover as a UE, and is configured with:
  • the S1 signaling connection parameter allocation module is configured to allocate, to the UE, the S1 signaling connection parameter of the eNodeB and the EPC.
  • the S1 signaling connection identifier information sending module 2 is configured to send the original S1 signaling connection parameter of the source eNodeB and the EPC, and the S1 signaling connection parameter of the target eNodeB and the EPC, that is, send the original S1 signaling connection parameter and new S1 signaling connection parameter; the signaling connection identification information may be sent in a handover complete message;
  • the system may further include a core EPC of the evolved packet, configured to update the route according to the information sent by the S1 signaling connection parameter sending module 2, and save the S1 signaling connection parameter of the target eNodeB and the EPC. And can find the original communication entity according to the original S1 signaling connection parameter.
  • a core EPC of the evolved packet configured to update the route according to the information sent by the S1 signaling connection parameter sending module 2, and save the S1 signaling connection parameter of the target eNodeB and the EPC. And can find the original communication entity according to the original S1 signaling connection parameter.
  • the foregoing EPC further includes a control plane entity MME and a user plane entity UPE, which are specifically:
  • the MME saves the S1 signaling connection parameter of the target eNodeB and the EPC, and searches for the original communication entity according to the original S1 signaling connection parameter; when the S1 signaling connection parameter is the MME communication context identifier and the eN odeB communication context
  • the MME is also used to assign a new control plane entity communication context identifier.
  • the embodiment of the present invention adds an S1 signaling connection identifier or a message context identifier to the message in the handover process, so that after the UE performs the handover, the target eNodeB can establish S1 signaling according to the identifier and the EPC.
  • the connection effectively solves the problem that the target eNodeB cannot establish a connection with the EPC after the handover of the UE in the prior art.

Description

说明书 一种演进网络中建立 SI信令连接的方法、 装置及系统
[1] 技术领域
[2] 本发明涉及通信技术领域， 尤其涉及一种演进网络中建立 S1信令连接的方法、 装置及系统。
[3] 发明背景
[4] 在 SAE (系统架构演进） /LTE (长期演进） 网络中， S1接口为 eUTRAN (演进 的无线接入网） 和 CN
Node (核心网节点， 包括 MME/UPE) 之间的接口， 该接口分为控制面接口 S1-C P和用户面接口 S1-UP。 其中 SI-CP为 eUTRAN和 MME (控制面实体） 之间的接 口， S1-UP为 eUTRAN和 UPE (用户面实体） 之间的接口。
[5] 在 SAE/LTE网络中， eNodeB (eUTRAN中包括的演进的基站） 和 MME间， 两个 S1-CP应用部分实体间的逻辑连接称为 S1信令连接， S1-CP
应用部分为 S1控制面接口应用部分协议。 在目前的 SAE/LTE网络中， 釆用 SCTP (流控制传输协议） 作为 S1接口控制面信令的传输协议。 S1-CP接口的协议栈如 图 1所示。
[6] 图 1中所示的 eRANAP协议实体即为 S1-CP
应用部分协议实体， 为了使在 SCTP传输链路上的应用信令正确路由到 S1控制面 接口应用部分的实体中，
需要在传输链路和 S1信令连接间存在一个一一对应的关联关系， 目前可选的关 联方法有如下两种：
[7] 方法 1：釆用 SCTP协议包头中的 PPI (Payload Protocol
Identifier, 有效负荷协议标识） 字段传输 S1信令连接的标识信息， 实现步骤如下
[8] 1) eNodeB或 MME在 NAS (非接入层） 信令连接建立吋，
为每个 UE分配一个 S1信令连接标识 （SI signalling connection
ID) ， 可以由发起 NAS信令连接建立的实体分配 SI信令连接标识。 在该 S1信令 连接上的第一条 NAS消息中将该 SI信令连接标识传送给对端节点， 如将 S1信令 连接标识包含在 S1应用层信令消息初始 UE消息 Initial UE
Message中， 由 eNodeB实体传递给 MME, eNodeB和 MME需要在 SI信令连接存在 的周期内保存这个 S1信令连接标识；
2) eNodeB和 MME分别为新建立的 S1信令连接分配通信实例， 该 S1信令连接 由两端 SCTP实体的偶联 （SCTP Association) 和 SCTP流 （SCTP
Stream) 以及 S 1信令连接标识唯一标识；
3) 当 eNodeB的 eRANAP通信实体需要发送消息到 MME的 eRANAP通信实体吋, eNodeB将 S1信令连接标识填加到每个 SCTP数据块的 PPI字段中， 然后通过 SCTP 协议将该消息发送给 MME实体；
4) MME实体根据每个 SCTP数据块中的 PPI字段将该消息正确路由到该 S1信令 连接的通信实例。
方法 2:如图 2所示， 为 eNodeB和 MME分别分配一个通信上下文标识 （MME communication context identifier, eNB communication context identifier) , eNodeB或 MME实体在每条应用层信令消息中携带相应的通信上下文标识， 对端 应用层信令实体根据该通信上下文标识将信令消息路由到正确的通信实体中。 而在切换过程中， 切换完成后， 需要建立目标 eNodeB和 EPC间 S1信令连接， 来 实现目标 eNodeB和 EPC的连接。
发明内容
本发明实施例提供一种演进网络中建立 S1信令连接的方法、 装置及系统， 解决 了现有技术中切换完成后目标 eNodeB和 EPC间无法建立 S1信令连接的问题。 本发明实施例是通过以下技术方案实现的：
本发明实施例提供一种发送 S1信令连接参数信息的方法， 包括：
源演进的基站 eNodeB发送携带源 eNodeB的 S 1信令连接参数信息的切换请求消 息给目标 eNodeB , 发起用户设备 UE向目标 eNodeB的切换过程。
本发明实施例提供一种演进网络中建立 S1信令连接的方法， 包括：
接收携带源演进基站 eNodeB的 S1信令连接参数信息的切换请求消息； 当 UE进入目标小区后， 分配新的 eNodeB的 S 1信令连接参数； [22] 发送携带源 eNodeB的 SI信令连接参数和目标 eNodeB的 SI信令连接参数的切换 完成消息到演进的分组核心 EPC。
[23] 本发明实施例提供一种演进的基站， 包括：
[24] S1信令连接参数分配模块， 用于为 UE分配 eNodeB与 EPC的 S1信令连接参数； [25] S1信令连接标识信息发送模块二， 用于发送接收到的 S1信令连接参数及所述 S1 信令连接参数分配模块分配的 S1信令连接参数给 EPC。
[26] 本发明实施例提供一种演进网络中建立 SI信令连接的系统， 包括：
[27] 至少两个演进的基站 eNodeB， 包括源 eNodeB和目标 eNodeB，
[28] 所述源 eNodeB包括：
[29] S1信令连接参数发送模块一， 用于发送源 eNodeB与 EPC的原 S1信令连接参数给 目标 eNodeB；
[30] 所述目标 eNodeB包括：
[31] S1信令连接参数分配模块， 用于为 UE分配 eNodeB与 EPC的 S1信令连接参数； [32] S1信令连接标识信息发送模块二， 用于发送接收到的源 eNodeB与 EPC的原 S1信 令连接参数及所述 S1信令连接参数分配模块分配的目标 eNodeB与 EPC的 S1信令 连接参数给 EPC。
[33] 由上述本发明实施例提供的技术方案可以看出， 本发明实施例通过在切换过程 的消息中增加 S1信令连接参数， 如 S1信令连接标识或通信上下文标识， 使得 UE 在进行 Intra-LTE切换后， 目标 eNodeB可以根据所述 S 1信令连接参数与 EPC建立 S 1信令连接， 有效解决了现有技术 UE进行 Intra-LTE切换后目标 eNodeB无法与 EP C建立 S1信令连接的问题。
[34] 附图简要说明
[35] 图 1为现有技术 S1-CP接口的协议栈结构图；
[36] 图 2为现有技术通信上下文标识使用示意图；
[37] 图 3为现有技术切换流程图；
[38] 图 4为本发明实施方式一流程图；
[39] 图 5为本发明实施方式一的实施例一流程图；
[40] 图 6为本发明实施方式一的实施例二流程图； [41] 图 7为本发明实施方式二流程图；
[42] 图 8为本发明实施方式二的实施例一流程图；
[43] 图 9为本发明实施方式二的实施例二流程图；
[44] 图 10为本发明实施例的一种系统结构示意图。
[45] 实施本发明的方式
[46] 目前在 SAE/LTE网络中， LTE内切换 (intra-LTE
HO) 流程如图 3所示， 包括如下步骤：
[47] 步骤 301 : 源 eNodeB内的 UE上下文包含有漫游限制信息， 源 eNodeB实体根据 该漫游限制信息配置 UE的测量控制过程；
[48] 该漫游限制信息在连接建立吋或在最后一次 TA (跟踪区） 更新吋提供， 源 eNo deB提供测量信息给 UE， 有助于控制 UE的连接移动过程。
[49] 步骤 302: UE根据指定的规则触发测量报告的上报；
[50] UE可以根据某个指定的规则如系统信息等上报测量报告给源 eNodeB。
[51] 步骤 303: 源 eNodeB根据该 UE上报的测量报告和源 eNodeB的 RRM (无线资源 管理） 信息， 在 UE进行切换吋， 决定将 UE切换到由目标 eNodeB控制的一个小区 中；
[52] 步骤 304: 源 eNodeB向目标 eNodeB发送切换请求 HANDOVER
REQUEST消息， 该切换请求消息中承载目标 eNodeB切换准备吋所需的信息； [53] 该信息包括： UE在源 eNodeB的 X2信令上下文参考、 UE在 S1接口的 EPC (演进 的分组核心） 的信令上下文参考、 目标小区标识、 RRC (无线资源控制协议 上下文、 SAE承载上下文。
[54] 目标 eNodeB用 UE的 S1/X2信令连接参考来寻址源 eNodeB和 EPC。 该 SAE承载上 下文包括： 目标 eNodeB切换准备吋所需的无线网络层和传输网络层的地址信息 、 SAE承载的服务质量概貌、 以及可能的接入层配置信息， 目标 eNodeB配置所 需要的资源。
[55] 步骤 305： 目标 eNodeB根据接收到的该 SAE承载服务质量概貌完成准入控制， 以提高切换成功的可能性；
[56] 目标 eNodeB如果能够满足 SAE承载的资源需求， 则根据收到的该 SAE承载服务 质量概貌分配相应资源， 同吋预留一个 C-RNTI (小区-无线网络临吋标识） ； [57] 步骤 306: 目标 eNodeB向源 eNodeB发送切换请求应答 HANDOVER REQUEST
ACKNOLEDGE消息， 源 eNodeB接收到该切换请求应答 HANDOVER REQUEST
ACKNOLEDGE消息后， 发送切换命令 HANDOVER
COMMAND消息给 UE定， 并启动开始定吋器；
[58] 该 HANDOVER REQUEST
ACKNOLEDGE消息中包含新分配的 C-RNTI及其它可能的参数， 如： 接入参数
、 建立转发隧道用的 RNL/TNL信息等等；
[59] 上述 HANDOVER
COMMAND消息中包含： 新分配的 C-RNTI、 可能的开始吋间、 目标 eNodeB的 SI
_t$
[60] 步骤 307: UE收到源 eNodeB实体发送的切换命令后， 开始执行切换过程；
[61] 步骤 308: HANDOVER
COMMAND开始定吋器超吋后， UE与目标 eNodeB完成同步过程， 然后获取上行 吋间提前量；
[62] 步骤 309: 网络以分配的上行吋间提前量响应；
[63] 步骤 310: —旦成功接入目标小区， UE就向目标 eNodeB
发送切换完成 HANDOVER
CONFIRM消息， 表示切换完成， 目标 eNodeB检査消息中的 C-RNTI是否是自己 所分配来进行确认；
[64] 步骤 311 : 目标 eNodeB向 EPC发送切换完成 HANDOVER
COMPLETE消息， 通知 EPC该 UE已经更换小区；
[65] EPC将数据路由切换到目标 eNodeB , 并释放源 eNodeB相关的用户面和传输网 络层的资源；
[66] 步骤 312: EPC向目标 eNodeB发送切换完成应答 HO COMPLETE
ACK消息， 确认切换完成；
[67] 步骤 313: 目标 eNodeB向源 eNodeB发送资源释放 RELEASE
RESOURCE消息， 触发源 eNodeB释放资源； 步骤 314: 收到该资源释放 RELEASE
RESOURCE消息后， 源 eNodeB释放和该 UE上下文相关的无线资源和控制面的资 源。
本发明实施例通过在切换流程中的一些消息中携带 S1信令连接参数， 如， S1信 令连接标识信息或通信上下文标识信息， 来实现切换完成后目标 eNodeB和 EPC 间建立新 S1信令连接的过程。
本发明实施方式一的方案为：
如图 4所示， 在现有的切换流程中， 在源 eNodeB向目标 eNodeB发送的切换请求 HANDOVER
REQUEST消息中， 增加当前的 S1信令连接标识信息， 即原 S1信令连接标识信息 ， 该当前的 S1信令连接标识信息包括： 源 eNodeB和 EPC切换前使用的 S1信令连 接标识， 同吋可选的包括 SCTP偶联标识及 SCTP流标识。
在目标 eNodeB向 EPC发送的切换完成 HANDOVER
COMPLETE消息中， 携带原 S1信令连接标识信息以及新的 S1信令连接标识， 同 吋在承载 HAANDOVER
COMPLETE消息的 SCTP消息中使用新的 S1信令连接标识信息。 该新的 S1信令连 接标识信息包括： SCTP偶联标识 （可选） 、 SCTP流标识 （可选） 以及 S1信令连 接标识。
在目标 eNodeB向 EPC发送的切换完成 HANDOVER
COMPLETE消息后 , EPC收到 HANDOVER
COMPLETE消息， EPC实体向目标 eNodeB发送切换完成应答 HO COMPLETE ACK消息前， 创建新的通信实例， 同吋保存该 HANDOVER
COMPLETE消息中携带的新的 S 1信令连接标识信息， EPC根据原 S 1信令连接标 识信息査找原通信实例， 从而实现目标 eNodeB与 EPC建立 S1信令连接。
下面结合附图对实施方式一的具体实现过程进行详细说明。
实施方式一的一种具体实施例如图 5所示， 具体包括如下步骤：
步骤 501 : 源 eNodeB内的 UE上下文包含有漫游限制信息， 源 eNodeB实体根据 [77] 该漫游限制信息在连接建立吋或在最后一次 TA (跟踪区） 更新吋提供， 源 eNo deB提供测量信息给 UE， 有助于控制 UE的连接移动过程。
[78] 步骤 502: UE根据指定的规则触发测量报告的上报；
[79] 该 UE可以根据某个指定的规则如系统信息等上报测量报告给源 eNodeB。
[80] 步骤 503: 源 eNodeB根据该 UE上报的测量报告和源 eNodeB的 RRM (无线资源 管理） 信息， 在 UE需要进行切换吋， 决定将 UE切换到由目标 eNodeB控制的一个 小区中；
[81] 步骤 504： 源 eNodeB向目标 eNodeB发送切换请求 HANDOVER
REQUEST消息， 该切换请求消息中承载目标 eNodeB切换准备吋所需的信息； [82] 上述切换准备所需的信息包括： UE在源 eNodeB的 X2信令上下文参考、 UE在 S1 接口的 EPC (演进的分组核心） 的信令上下文参考、 目标小区标识、 RRC (无线 资源控制协议） 上下文、 SAE承载上下文、 原 S1信令连接标识信息。
[83] 该原 S1信令连接标识信息包括： 源 eNodeB和 EPC切换前使用的 S1信令连接标识
， 同吋可选的包括 SCTP偶联标识及 SCTP流标识。
[84] 目标 eNodeB用 UE的 S1/X2信令连接参考来寻址源 eNodeB和 EPC。 该 SAE承载上 下文包括： 目标 eNodeB切换准备吋所需的无线网络层和传输网络层的地址信息
、 SAE承载的服务质量概貌、 以及可能的接入层配置信息， 目标 eNodeB配置上 述需要的资源。
[85] 步骤 505： 目标 eNodeB根据接收到的该 SAE承载服务质量概貌完成准入控制， 以提高切换成功的可能性；
[86] 目标 eNodeB如果能够满足 SAE承载的资源需求， 则根据收到的该 SAE承载服务 质量概貌分配相应资源， 同吋预留一个 C-RNTI;
[87] 步骤 506: 目标 eNodeB向源 eNodeB发送切换请求应答 HANDOVER REQUEST
ACKNOLEDGE消息， 源 eNodeB接收到该切换请求应答 HANDOVER REQUEST
ACKNOLEDGE消息后， 发送切换命令 HANDOVER
COMMAND消息给 UE定， 并启动开始定吋器；
[88] 该 HANDOVER REQUEST
ACKNOLEDGE消息中包含新分配的 C-RNTI及其它可能的参数， 如： 接入参数 、 建立转发隧道用的 RNL/TNL信息等等；
[89] 该 HANDOVER
COMMAND消息中包含： 新分配的 C-RNTI、 可能的开始吋间、 目标 eNodeB的 SI
_t$
[90] 步骤 507: UE收到源 eNodeB实体发送的切换命令后， 开始执行切换过程；
[91] 步骤 508: HANDOVER
COMMAND开始定吋器超吋后， UE与目标 eNodeB完成同步过程， 然后获取上行 吋间提前量；
[92] 步骤 509: 网络以分配的上行吋间提前量响应；
[93] 步骤 510: —旦成功接入目标小区， UE就向目标 eNodeB
发送切换完成 HANDOVER
CONFIRM消息， 表示切换完成， 目标 eNodeB检査消息中的 C-RNTI是否是自己 所分配来进行确认；
[94] 步骤 511 : 目标 eNodeB向 MME发送切换完成 HANDOVER
COMPLETE消息， 通知 MME该 UE已经更换小区， 并建立 S1信令连接；
[95] 该 MME是 EPC中的一个实体， 负责控制面的移动性管理， 包括用户上下文和移 动状态管理， 分配临吋身份标识等；
[96] 该目标 eNodeB分配新的 S1信令连接标识信息， 该新的 S1信令连接标识信息包 括 S1信令连接标识， 同吋可选的包括 SCTP偶联标识及 SCTP流标识；
[97] 目标 eNodeB在 HANDOVER
COMPLETE消息中携带上述新的 SI信令连接标识信息和原 SI信令连接标识信息
[98] UPE将数据路由切换到目标 eNodeB , 并释放源 eNodeB相关的用户面和传输网 络层的资源；
该 UEP是 EPC中的一个实体， 负责空闲状态下为下行数据发起寻呼， 管理保存 IP 承载参数和网络内路由信息等。
[99] 上述操作的具体实现过程包括如下步骤：
[100] MME收到上述 HANDOVER COMPLETE消息后， 创建新的通信实例， 同吋保存该 HANDOVER COMPLETE消息中携带的新的 S 1信令连接标识信息， MME根据原 S 1信令连接标 识信息査找原通信实例， 该步骤为可选步骤， 图中未示出；
[101] 步骤 511a、 MME向 UPE发送重新路由请求消息， 请求 UPE进行用户面路由更新
[102] 步骤 511b、 UPE向 MME发送重新路由响应消息， 表示用户面路由更新完成。
[103] 步骤 512: MME向目标 eNodeB发送切换完成应答 HO COMPLETE
ACK消息， 确认切换完成；
[104] 步骤 513: 目标 eNodeB向源 eNodeB发送资源释放 RELEASE
RESOURCE消息， 触发源 eNodeB释放资源；
[105] 步骤 514: 收到上述资源释放 RELEASE
RESOURCE消息后， 源 eNodeB释放和 UE上下文相关的无线资源和控制面的资源
[106] 上述实施例通过在切换过程中的切换请求消息中承载原 S1信令连接标识信息， 及在切换完成消息中携带目标 eNodeB新分配的 S1信令连接标识信息和原 S1信令 连接标识信息， 实现了在 UE切换到目标小区后能够根据上述原 S1信令连接标识 信息及新 S1信令连接标识信息建立 EPC与目标 eNodeB的 S1信令连接。
[107] 本发明实施方式一的另一种具体实施例如图 6所示， 其与上述实施例的区别在 于步骤 611， 本实施例步骤 611包括：
[108] 目标 eNodeB向 UPE发送切换完成 HANDOVER
COMPLETE消息， 通知 UPE上述 UE已经更换小区， 并建立 S1信令连接；
[109] UEP是 EPC中的一个实体， 负责空闲状态下为下行数据发起寻呼， 管理保存 IP 承载参数和网络内路由信息等。
[110] 目标 eNodeB分配新的 S1信令连接标识信息， 该新的 S1信令连接标识信息包括 S 1信令连接标识， 同吋可选的包括 SCTP偶联标识及 SCTP流标识；
[111] 目标 eNodeB在上述 HANDOVER
COMPLETE消息中携带上述新的 SI信令连接标识信息和原 SI信令连接标识信息 [112] UPE将数据路由切换到目标 eNodeB , 并释放源 eNodeB相关的用户面和传输网 络层的资源。
[113] 上述操作的具体实现过程包括如下步骤：
[114] 步骤 611a、 UPE收到上述 HANDOVER
COMPLETE消息后， 向 MME发送路由更新请求消息， 通知 MME用户面路由已 经更新， 该路由更新请求消息中携带上述新的 S1信令连接标识信息和原 S1信令 连接标识信息；
[115] MME收到上述路由更新请求消息后， 创建新的通信实例， 同吋保存该路由更 新消息中携带的新的 S1信令连接标识信息，
MME根据原 S1信令连接标识信息査找原通信实例， 该步骤为可选步骤， 图中未 示出；
[116] 步骤 611b、 上述操作完成后 MME向 UPE发送路由更新响应消息。
[117] 其他操作步骤与上述实施例相同。
[118] 本发明实施方式二的方案为：
[119] 如图 7所示， 在现有的切换流程中， 在源 eNodeB向目标 eNodeB发送的 HANDO VER REQUEST消息中， 增加原控制面实体通信上下文标识 (MME
Communication Context
Identifier) , 可选地增加源 eNodeB通信上下文标识 (eNodeB Communication Context Identifier)；
[120] 目标 eNodeB分酉己新的 eNodeB通信上下文标识 (eNodeB Communication Context Identifier) ， 在目标 eNodeB向 EPC发送的切换完成 HANDOVER
COMPLETE消息中， 携带上述原控制面实体通信上下文标识及上述新的 eNodeB 通信上下文标识， 可选地增加源 eNodeB通信上下文标识；
[121] 在目标 eNodeB向 EPC发送的切换完成 HANDOVER
COMPLETE消息 , EPC收到该 HANDOVER
COMPLETE消息后， EPC实体向目标 eNodeB发送切换完成应答 HO COMPLETE ACK消息前， EPC创建新的通信实例， 同吋保存该 HANDOVER
COMPLETE消息中携带的新的 eNodeB通信上下文标识， EPC根据原控制面实体通信上下文标识査找原通信实例；
[122] EPC分配新的控制面实体通信上下文标识 （MME Communication Context
Identifier) ， 携带于发送给目标 eNodeB的切换完成应答 HANDOVER
COMPLETE ACK消息中发送至目标 eNodeB。
[123] 实施方式二的一种具体实施例如图 8所示， 包括如下步骤：
[124] 步骤 801 : 源 eNodeB内的 UE上下文包含有漫游限制信息， 源 eNodeB实体根据 该漫游限制信息配置 UE的测量控制过程；
[125] 上述漫游限制信息在连接建立吋或在最后一次 TA (跟踪区） 更新吋提供， 源 e
NodeB提供测量信息给 UE， 有助于控制 UE的连接移动过程。
[126] 步骤 802: UE根据指定的规则触发测量报告的上报；
[127] UE可以根据某个指定的规则如系统信息等上报测量报告给源 eNodeB。
[128] 步骤 803: 源 eNodeB根据 UE上报的测量报告和源 eNodeB的 RRM (无线资源管 理） 信息， 在 UE需要进行切换吋， 决定将 UE切换到由目标 eNodeB控制的一个小 区中；
[129] 步骤 804: 源 eNodeB向目标 eNodeB发送切换请求 HANDOVER
REQUEST消息， 该切换请求消息中承载目标 eNodeB切换准备吋所需的信息； [130] 上述切换准备吋所需的信息包括： UE在源 eNodeB的 X2信令上下文参考、 UE在 S1接口的 EPC (演进的分组核心） 的信令上下文参考、 目标小区标识、 RRC (无 线资源控制协议）
上下文、 SAE承载上下文、 原控制面实体通信上下文标识 (MME Communication Context Identifier) , 可选地， 包括源 eNodeB通信上下文标识 (eNodeB
Communication Context Identifier)。
[131] 目标 eNodeB用 UE的 S1/X2信令连接参考来寻址源 eNodeB和 EPC。 上述 SAE承载 上下文包括： 目标 eNodeB切换准备吋所需的无线网络层和传输网络层的地址信 息、 SAE承载的服务质量概貌、 以及可能的接入层配置信息， 目标 eNodeB配置 上述需要的资源。
[132] 步骤 805: 目标 eNodeB根据接收到的上述 SAE承载服务质量概貌完成准入控制
， 以提高切换成功的可能性； [133] 目标 eNodeB如果能够满足 SAE承载的资源需求， 则根据收到的该 SAE承载服务 质量概貌分配相应资源， 同吋预留一个 C-RNTI;
[134] 步骤 806: 目标 eNodeB向源 eNodeB发送切换请求应答 HANDOVER REQUEST
ACKNOLEDGE消息， 源 eNodeB接收到该切换请求应答 HANDOVER REQUEST
ACKNOLEDGE消息后， 发送切换命令 HANDOVER
COMMAND消息给 UE定， 并启动开始定吋器；
[135] 上述 HANDOVER REQUEST
ACKNOLEDGE消息中包含上述新分配的 C-RNTI及其它可能的参数， 如： 接入 参数、 建立转发隧道用的 RNL/TNL信息等等；
[136] 上述 HANDOVER
COMMAND消息中包含： 新分配的 C-RNTI、 可能的开始吋间、 目标 eNodeB的 SI
_t$
[137] 步骤 807: UE收到源 eNodeB实体发送的切换命令后， 开始执行切换过程；
[138] 步骤 808: HANDOVER
COMMAND开始定吋器超吋后， UE与目标 eNodeB完成同步过程， 然后获取上行 吋间提前量；
[139] 步骤 809: 网络以分配的上行吋间提前量响应；
[140] 步骤 810: —旦成功接入目标小区， UE就向目标 eNodeB
发送切换完成 HANDOVER
CONFIRM消息， 表示切换完成， 目标 eNodeB检査消息中的 C-RNTI是否是自己 所分配来进行确认；
[141] 步骤 811 : 目标 eNodeB向 MME发送切换完成 HANDOVER
COMPLETE消息， 通知 MME该 UE已经更换小区， 并建立 S1信令连接；
[142] 目标 eNodeB分酉己新的 eNodeB通信上下文标识 (eNodeB Communication Context
Identifier); 并在上述 HANDOVER
COMPLETE消息中携带上述原控制面实体通信上下文标识及上述新的 eNodeB通 信上下文标识， 可选地， 携带源 eNodeB通信上下文标识；
[143] UPE将数据路由切换到目标 eNodeB , 并释放源 eNodeB相关的用户面和传输网 络层的资源；
[144] 上述操作的具体实现过程包括如下步骤：
[145] MME收到上述 HANDOVER
COMPLETE消息后， 创建新的通信实例， 同吋保存该 HANDOVER
COMPLETE消息中携带的新的 eNodeB通信上下文标识，
MME根据上述原控制面实体通信上下文标识査找原通信实例， 该步骤为可选步 骤， 图中未示出；
[146] 步骤 811a、 MME向 UPE发送重新路由请求消息， 请求 UPE进行用户面路由更新
[147] 步骤 811b、 UPE向 MME发送重新路由响应消息， 表示用户面路由更新完成。
[148] 步骤 812: MME向目标 eNodeB发送切换完成应答 HO COMPLETE
ACK消息， 确认切换完成；
[149] 可选地， MME可分配新的控制面实体通信上下文标识， 并将该新的控制面实 体通信上下文标识携带于 HO COMPLETE ACK消息中；
[150] 步骤 813: 目标 eNodeB向源 eNodeB发送资源释放 RELEASE
RESOURCE消息， 触发源 eNodeB释放资源；
[151] 步骤 814: 收到上述资源释放 RELEASE
RESOURCE消息后， 源 eNodeB释放和 UE上下文相关的无线资源和控制面的资源
[152] 上述实施例通过在切换过程中的切换请求消息中承载原控制面实体通信上下文 标识， 及在切换完成消息中携带目标 eNodeB新分配的通信上下文标识和上述原 控制面实体通信上下文标识， 实现了在 UE切换到目标小区后能够根据上述原 S1 信令连接标识信息及新 S1信令连接标识信息建立 EPC与目标小区的 S1信令连接。
[153] 本发明实施方式二的另一具体实施例如图 9所示， 其与上述实施方式二的实施 例的区别在于步骤 911， 本实施例步骤 911包括：
[154] 步骤 911 : 目标 eNodeB向 UPE发送切换完成 HANDOVER
COMPLETE消息， 通知 UPE该 UE已经更换小区， 并建立 S1信令连接；
[155] 目标 eNodeB分酉己新的 eNodeB通信上下文标识 (eNodeB Communication Context Identifier); 并在该 HANDOVER
COMPLETE消息中携带该原控制面实体通信上下文标识及新的 eNodeB通信上下 文标识， 可选地， 携带源 eNodeB通信上下文标识；
[156] UPE将数据路由切换到目标 eNodeB , 并释放源 eNodeB相关的用户面和传输网 络层的资源；
[157] 上述操作的具体实现过程包括如下步骤：
[158] 步骤 911a、 UPE收到上述 HANDOVER
COMPLETE消息后， 向 MME发送路由更新请求消息， 通知 MME用户面路由已 经更新， 该路由更新请求消息中携带所述原控制面实体通信上下文标识及所述 新的 eNodeB通信上下文标识；
[159] MME收到上述路由更新请求消息后， 创建新的通信实例， 同吋保存该路由更 新请求消息中携带的新的 eNodeB通信上下文标识，
MME根据原控制面实体通信上下文标识査找原通信实例， 该步骤为可选步骤， 图中未示出；
[160] 步骤 911b、 MME分配新的控制面实体通信上下文标识， 并向 UPE发送携带有 该新分配的控制面实体通信上下文标识的路由更新响应消息。
[161] 步骤 12: UPE向目标 eNodeB发送切换完成应答 HO COMPLETE
ACK消息， 确认切换完成；
[162] 可选地， 该切换完成应答消息中可携带所述新分配的控制面实体通信上下文标 识；
[163] 本实施例的其他操作步骤与实施方式二的上述实施例相同。
[164] 本发明又一实施例提供一种演进网络中 S1信令连接建立系统， 该系统实施例如 图 10所示， 包括：
[165] 至少两个演进的基站 eNodeB , 所述 eNodeB在作为 UE进行切换的源 eNodeB吋， 设置有：
[166] S1信令连接参数分配模块， 用于为 UE分配本 eNodeB与 EPC的 S1信令连接参数 ； 所述 S1信令连接参数包括： S1信令连接标识或 MME/eNodeB通信上下文标识 [167] SI信令连接参数发送模块一， 用于发送原 SI信令连接参数给目标 eNodeB , 即 发送 S1信令连接参数分配模块为 UE分配的源 eNodeB与 EPC的 S1信令连接参数给 目标 eNodeB； 所述 S 1信令连接参数可以釆用 SCTP协议包头中的 PPI字段包含于 S 1信令连接标识信息中， 并承载于切换请求消息中来传输； 所述 S1信令连接标识 信息同吋可选的包含 SCTP偶联标识及 SCTP流标识； 或釆用 MME通信上下文标 识和 eNodeB通信上下文标识。
[168] 该 eNodeB在作为 UE进行切换的目标 eNodeB吋， 设置有：
[169] S1信令连接参数分配模块， 用于为 UE分配本 eNodeB与 EPC的 S1信令连接参数
[170] S1信令连接标识信息发送模块二， 用于发送源 eNodeB与 EPC的原 S1信令连接参 数及该目标 eNodeB与 EPC的 S1信令连接参数， 即发送原 S1信令连接参数及新 S1 信令连接参数； 该信令连接标识信息可以承载于切换完成消息中发送；
[171] 本实施例中， 上述系统还可以包括演进分组的核心 EPC, 用于根据上述 S1信令 连接参数发送模块二发送的信息更新路由， 并保存上述目标 eNodeB与 EPC的 S1 信令连接参数， 并可根据上述原 S1信令连接参数査找原通信实体。
[172] 上述 EPC进一步包括控制面实体 MME和用户面实体 UPE, 具体为：
[173] 由该 MME保存上述目标 eNodeB与 EPC的 S1信令连接参数， 并根据上述原 S1信 令连接参数査找原通信实体； 当该 S1信令连接参数为 MME通信上下文标识和 eN odeB通信上下文标识吋， 该 MME还用于分配新的控制面实体通信上下文标识。
[174] 由该 UPE进行切换完成后的路由更新。
[175] 综上所述， 本发明实施例通过在切换过程的消息中增加 S1信令连接标识或信上 下文标识， 使得 UE在进行切换后， 目标 eNodeB可以根据所述标识与 EPC建立 S1 信令连接， 有效解决了现有技术 UE进行切换后目标 eNodeB无法与 EPC建立连接 的问题。
[176] 以上所述， 仅为本发明较佳的具体实施方式， 但本发明的保护范围并不局限于 此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易想到 的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围 应该以权利要求的保护范围为准。

Claims

权利要求书
[1] 1、 一种发送 si信令连接参数信息的方法， 其特征在于， 包括：
源演进的基站 eNodeB发送携带源 eNodeB的 S1信令连接参数信息的切换请 求消息给目标 eNodeB , 发起用户设备 UE向目标 eNodeB的切换过程。
[2] 2、 如权利要求 1所述的方法， 其特征在于， 所述 S1信令连接参数信息包括
S1信令连接标识信息； 或， 通信上下文标识信息。
[3] 3、 如权利要求 2所述的方法， 其特征在于， 所述 S1信令连接标识信息包括
： S1信令连接标识。
[4] 4、 如权利要求 3所述的方法， 其特征在于， 所述 S1信令连接标识信息进一 步包括：
流控制传输协议 SCTP偶联标识及 SCTP流标识。
[5] 5、 如权利要求 2所述的方法， 其特征在于， 所述通信上下文标识信息包括
： 控制面实体 MME通信上下文标识； 或， MME通信上下文标识和 eNodeB 通信上下文标识。
[6] 6、 一种演进网络中建立 S1信令连接的方法， 其特征在于， 包括：
接收携带源演进基站 eNodeB的 S 1信令连接参数信息的切换请求消息； 当 UE进入目标小区后， 分配新的 eNodeB的 S 1信令连接参数； 发送携带源 eNodeB的 S1信令连接参数和目标 eNodeB的 S1信令连接参数的 切换完成消息到演进的分组核心 EPC。
[7] 7、 如权利要求 6所述的方法， 其特征在于， 所述 S1信令连接参数信息包括
S1信令连接标识信息； 或， 通信上下文标识信息。
[8] 8、 如权利要求 7所述的方法， 其特征在于， 所述 S1信令连接标识信息包括
： S1信令连接标识。
[9] 9、 如权利要求 8所述的方法， 其特征在于， 所述 S1信令连接标识信息进一 步包括：
流控制传输协议 SCTP偶联标识及 SCTP流标识。
[10] 10、 如权利要求 7所述的方法， 其特征在于， 所述通信上下文标识信息包括
： 控制面实体 MME通信上下文标识； 或， MME通信上下文标识和 eNodeB 通信上下文标识。
[11] 11、 如权利要求 6至 10任一项所述的方法， 其特征在于， 所述方法还包括：
EPC接收所述携带新 S1信令连接参数和原 S1信令连接参数的切换完成消息
[12] 12、 如权利要求 11所述的方法， 其特征在于， 所述方法还包括：
所述 EPC保存所述切换完成消息中的新 eNodeB的 S1信令连接参数； 或者， EPC中的 MME接收到所述切换完成消息之后， 向 EPC中的 UPE发送重新路 由请求消息， 请求 UPE进行用户面路由更新； UPE向 MME发送重新路由响 应消息， 表示用户面路由更新完成； 或者，
EPC中的 UPE接收到所述切换完成消息之后， 向 EPC中的 MME发送携带所 述原 S1信令连接参数和新 S1信令连接参数的路由更新请求消息， 通知 MME 用户面路由已经更新； MME收到所述消息后， 向 UPE发送路由更新响应消 息。
[13] 13、 如权利要求 11所述的方法， 其特征在于， 所述方法还包括：
所述 EPC收到所述携带新 S1信令连接参数和原 S1信令连接参数的切换完成 消息后， 根据所述原 S1信令连接参数査找原通信实例。
[14] 14、 如权利要求 11所述的方法， 其特征在于， 所述方法还包括：
所述 EPC中的 MME分配新的 MME通信上下文标识， 并发送携带所述新的 M ME通信上下文标识的切换完成应答消息给目标 eNodeB。
[15] 15、 一种演进的基站， 其特征在于， 包括：
S1信令连接参数分配模块， 用于为 UE分配 eNodeB与 EPC的 S1信令连接参数
S1信令连接标识信息发送模块二， 用于发送接收到的 S1信令连接参数及所 述 S1信令连接参数分配模块分配的 S1信令连接参数给 EPC。
[16] 16、 一种演进网络中建立 SI信令连接的系统， 其特征在于， 包括：
至少两个演进的基站 eNodeB， 包括源 eNodeB和目标 eNodeB， 所述源 eNodeB包括：
SI信令连接参数发送模块一， 用于发送源 eNodeB与 EPC的原 S1信令连接参 数给目标 eNodeB;
所述目标 eNodeB包括：
S1信令连接参数分配模块， 用于为 UE分配 eNodeB与 EPC的 S1信令连接参数
S1信令连接标识信息发送模块二， 用于发送接收到的源 eNodeB与 EPC的原
S1信令连接参数及所述 S1信令连接参数分配模块分配的目标 eNodeB与 EPC 的 S1信令连接参数给 EPC。
[17] 17、 如权利要求 16所述的系统， 其特征在于， 所述 EPC还根据所述原 S1信 令连接参数査找原通信实体。
[18] 18、 如权利要求 16或 17所述的系统， 其特征在于， 所述 EPC进一步包括： 控制面实体 MME和用户面实体 UPE;
所述 MME, 用于保存所述目标 eNodeB与 EPC的 S1信令连接参数， 并根据所 述原 S1信令连接参数査找原通信实体；
所述 UPE, 用于进行切换完成后路由更新。
[19] 19、 如权利要求 18所述的系统， 其特征在于， 所述 MME还用于分配新的 M
ME通信上下文标识发送给目标 eNodeB。
PCT/CN2008/070210 2007-01-29 2008-01-29 Method, device and system for establishing s1 signaling connection in evolved network WO2008092408A1 (en)

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EP08706587.6A EP2079250B2 (en) 2007-01-29 2008-01-29 Establishing s1 signaling connection in evolved network
ES08706587.6T ES2417487T5 (es) 2007-01-29 2008-01-29 Establecimiento de una conexión de señalización S1 en una red evolucionada
EP18195166.6A EP3448074B1 (en) 2007-01-29 2008-01-29 Method, apparatus and system for establishing s1 signaling connection in an evolved network
EP17156171.5A EP3203777B1 (en) 2007-01-29 2008-01-29 Establishing s1 signaling connection in an evolved network
PL18195166T PL3448074T3 (pl) 2007-01-29 2008-01-29 Sposób, urządzenie i system do ustanawiania połączeń sygnalizacyjnych S1 w rozwiniętej sieci
US12/466,628 US8363619B2 (en) 2007-01-29 2009-05-15 Method, apparatus and system for establishing S1 signaling connection in an evolved network
US13/731,270 US10172042B2 (en) 2007-01-29 2012-12-31 Method, apparatus and system for establishing signaling
US13/931,225 US8842638B2 (en) 2007-01-29 2013-06-28 Method, apparatus and system for establishing S1 signaling connection in an evolved network
US16/208,584 US11129058B2 (en) 2007-01-29 2018-12-04 Method, apparatus, and system for establishing signaling connection in communication network

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