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WO2009097733A1 - Procédé, appareil et système de traitement de service de domaine à commutation de paquet - Google Patents

Procédé, appareil et système de traitement de service de domaine à commutation de paquet Download PDF

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Publication number
WO2009097733A1
WO2009097733A1 PCT/CN2008/073779 CN2008073779W WO2009097733A1 WO 2009097733 A1 WO2009097733 A1 WO 2009097733A1 CN 2008073779 W CN2008073779 W CN 2008073779W WO 2009097733 A1 WO2009097733 A1 WO 2009097733A1
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WO
WIPO (PCT)
Prior art keywords
packet domain
user equipment
network
domain
target network
Prior art date
Application number
PCT/CN2008/073779
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English (en)
Chinese (zh)
Inventor
Qingyu Li
Wei Guo
Jian Zhang
Xiaoqin Duan
Xiaobo Wu
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009097733A1 publication Critical patent/WO2009097733A1/fr

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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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]

Definitions

  • the present invention relates to the field of communications, and in particular, to a technique for a user to process a packet domain service.
  • 2G/3G second generation mobile communication technology / third generation mobile communication technologies, such as GSM and WCDMA networks.
  • the network can be regarded as a comprehensive coverage to some extent.
  • SAE/LTE System Architecture Evolution/Long Term Evolution
  • HSPA High Speed Packet Access
  • HSPA+ High Speed Packet Access Evolution
  • WiMAX Worldwide Interoperability for Microwave Access
  • PS domain networks For convenience of description, networks such as SAE/LTE, HSPA, HSPA+, and WiMAX that provide only PS (Packet Switching) domains are collectively referred to as PS domain networks.
  • the voice calls of the mobile communication can be classified into the following categories:
  • the first type is a session type service carried by a CS (Circuit Switching) domain, such as a voice call;
  • CS Circuit Switching
  • the second type is the session-type service carried by the PS domain, which is also called VoIP (Voice over IP).
  • VoIP Voice over IP
  • the QoS Quality of Service, Service
  • IMS IP Multimedia Subsystem
  • Quality guarantees, such as IP-hosted voice calls.
  • voice calls are transmitted on their PS domain bearers, and IMS is IP-based.
  • the network controls voice calls.
  • voice calls are generally carried on the CS domain.
  • SA domain networks such as SAE/LTE, HSPA, HSPA+, and WiMAX
  • coverage is provided for hotspots, and 2G/3G networks can be regarded as a full coverage to some extent. Therefore, in the case where only the user's high-speed data service is provided or the IMS has not been deployed, some CS services, including voice calls, need to be carried by the CS domain of the traditional network, that is, some CS services of the user need to return to 2G/3G.
  • the CS domain of the network is implemented. This is the process of CS Fallback.
  • the inventors have found that at least the following problems exist in the prior art: In the prior art, if the UE performs CS Fallback, the UE reverts to the CS domain network, and the UE performs the service in the PS domain network before the fallback. How to deal with it, the existing technology does not provide an effective solution, so that when the UE backs up and tries to perform the service of the PS domain network, the UE and the network side may perform unnecessary signaling processing, which increases the complexity. Reduced efficiency. Summary of the invention
  • the embodiment of the invention provides a packet domain service processing method, so that a user can process a packet domain service.
  • An embodiment of the present invention provides a packet domain service processing method, including:
  • the user equipment located in the packet domain acquires packet domain service processing capability information of the target network, and determines whether to transfer the packet domain service to the target network.
  • a call unit configured to receive a circuit domain paging message or perform another call setup process; the determining unit, configured to acquire packet domain service processing capability information of the target network, to determine whether to transfer the packet domain service to the target network;
  • a mobile communication system includes a terminal side capable of communicating with a network side, where the terminal side includes:
  • the user equipment when receiving the circuit domain paging or performing another call setup process, acquires packet domain service processing capability information of the target network, and determines whether to transfer the packet domain service to the target network.
  • the user equipment located in the packet domain determines whether to transfer the packet domain service to the target network according to the packet domain service processing capability of the target network. .
  • the packet domain service can be transferred to the target network, so that the UE can still perform the original packet domain service after the CS Fallback, so that the user can obtain a good service experience.
  • the target network does not support the packet domain service, the ongoing packet domain service may be suspended, so that the UE can quickly resume the original packet domain service when it is re-arranged to the packet domain network; and the ongoing packet domain service can also be terminated. Therefore, it is possible to avoid waste of resources caused by the user still occupying the packet domain network resources when the user is camped on the traditional network.
  • FIG. 1 is a schematic diagram of a network architecture in a scenario applied to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a network architecture in another scenario to which the embodiment of the present invention is applied;
  • FIG. 3 is a schematic diagram of a network architecture in another scenario to which the embodiment of the present invention is applied;
  • FIG. 5 is a schematic diagram of a specific application example 2 of the method provided by the embodiment of the present invention in the network architecture shown in FIG. 1;
  • FIG. 6 is a schematic diagram of a specific application embodiment 4 of the network architecture shown in FIG. 2 according to the method provided by the embodiment of the present invention;
  • FIG. 5 is a schematic diagram of a specific application example 2 of the method provided by the embodiment of the present invention in the network architecture shown in FIG. 1;
  • FIG. 6 is a schematic diagram of a specific application embodiment 4 of the network architecture shown in FIG. 2 according to the method provided by the embodiment of the present invention;
  • FIG. 5 is a schematic diagram of a specific application example 2 of the method provided by the embodiment of the present invention in the network architecture shown in FIG. 1;
  • FIG. 6 is a schematic diagram of a specific application embodiment 4 of the network architecture shown in FIG. 2 according to the method provided by the embodiment of the present invention;
  • FIG. 5 is a schematic diagram of a specific application example 2 of the method provided by the embodiment of
  • FIG. 7 is a schematic diagram of a specific application example 5 of the method provided by the embodiment of the present invention in the network architecture shown in FIG. 2;
  • FIG. 8 is a schematic diagram of a specific application example 6 of the method provided by the embodiment of the present invention in the network architecture shown in FIG. 2;
  • FIG. 9 is a schematic diagram of a specific application embodiment 7 of the method provided by the embodiment of the present invention in the network architecture shown in FIG. 2;
  • FIG. 10 is a schematic diagram of a mobile communication system according to an embodiment of the present invention. detailed description
  • SAE/LTE In the initial deployment phase of SA domain networks such as SAE/LTE, HSPA, HSPA+, and WiMAX, coverage is provided for hotspots, and 2G/3G networks can be regarded as a full coverage to some extent.
  • the SAE/LTE network is used as an example of the PS domain network to describe the solution
  • the voice service is used as an example to describe the CS service to be initiated. It can be applied to the case where the UE camped on the PS domain network falls back to the legacy network CS domain due to the CS service.
  • MSC Mobile Switching Center
  • the CS paging message is sent by the (Mobility Management Entity).
  • the current network has two schemes, Architecture A and Architecture B.
  • the architecture A adds an ICF (Interworking Function), and CS Fallback is implemented in the architecture.
  • the IWF sends the circuit domain call signaling in the SAE/LTE network to keep the UE in the UE.
  • the Active state which in turn switches the UE to the 2G/3G network through the Handover process and establishes a circuit domain call.
  • the CS domain call signaling is established in the LTE/SAE network, and the CS Fallback is performed in the handover manner. Therefore, the user's selection right for the CS service is slightly different from the traditional call selection mechanism, that is, the called user receives the Setup. After the (establishment) message, the recipient's willingness to choose will be based on the calling number.
  • architecture B is implemented through the Gs+ interface.
  • Fallback similar to architecture A, can also associate SAE/LTE networks with 2G/3G networks by introducing intermediate modules.
  • This module can be a back-to-back gateway for implementing SAE/LTE networks and 2G/3G networks.
  • Mobility management function can be called MM Proxy module.
  • MM Proxy Mobility Management Agent
  • the UE attaches to the MME it will be jointly attached to the MM Proxy (Mobility Management Agent) module, so that when there is a CS call, the MM Proxy can page the UE on the SAE/LTE network through the MME.
  • MM Proxy Mobility Management Agent
  • the above MM Proxy module is a logic module, which may be a single entity, or the function of the module may be implemented on other entities, for example, implemented on an MME or implemented on a traditional MSC entity, and implemented on a legacy MSC entity.
  • the corresponding architecture is the architecture shown in Figure 2.
  • BSS Base Station System
  • RNS Radio Access Network System
  • BSS is a 2G wireless access node
  • RNS is a 3G wireless access node
  • the UE is connected by establishing a connection with these nodes first.
  • Networked The class Gs is the interface name between the MME and the MSC.
  • the MSC is upgraded in Figure 2 to support the transmission of CS paging messages to the MME. If the BSSAP+ (Base Station System Application Part Plus) and MAP (Mobile Application Part) protocols are not supported on the MME, there is a protocol translation entity (Protocol Translator) between the MME and the MSC, which is responsible for converting the Diameter protocol supported by the MME into an MSC.
  • the supported BSSAP+ or MAP protocol The supported BSSAP+ or MAP protocol.
  • the MM (Mobility Management) status in the PS Domain can be divided into three types, namely: PMM-DETACHED (mobility management of packet domain-de-attachment state), PMM-IDLE (movement of packet domain) Sex management - idle state), PMM CONNECTED (packet domain mobility management - connection state).
  • PMM-DETACHED mobility management of packet domain-de-attachment state
  • PMM-IDLE movement of packet domain
  • Sex management - idle state Sex management - idle state
  • PMM CONNECTED packet domain mobility management - connection state
  • SM Session Management
  • the UE performs CS Fallback, after the UE rolls back to the CS domain network, the UE terminates or suspends the service in the PS domain network before the fallback. Accordingly, is the bearer of the PS network released or reserved? If the UE is re-arranged to the PS network after completing the CS call, the PS bearer is re-established, which is a waste of time. If the PS network is reserved and not returned to the legacy CS domain, the UE has the downlink of the PS. When the data is used, the PS network will page the UE as usual, which will cause the paging to fail.
  • the embodiment of the present invention provides a packet domain service processing method, including the following steps.
  • a user equipment located in a packet domain receives a circuit domain paging or performs another call setup process;
  • step 102 acquiring packet domain service processing capability information of the target network
  • step 103 it is determined whether the packet domain traffic is transferred to the target network.
  • the UE After the UE performs the CS Fallback, the UE is no longer camped on the SAE/LTE network. Therefore, the state of the UE in the SAE/LTE network may be the LTE-DETACHED state or the LTE-IDLE state. However, before the CS Fallback, the UE may be in the LTE-IDLE state and the LTE-CONNECTED state. Therefore, the following may be the case:
  • CS Fallback occurs when the UE is in the LTE-CONNECTED state:
  • the determining whether to transfer the packet domain service to the target network further includes: prohibiting the transfer of the packet domain service of the user equipment to the target network:
  • the flag indicates that the UE has been Fallback to the CS domain and temporarily does not allow the UE to perform new uplink/downlink PS services on the PS network, and the UE transitions to the LTE-IDLE state in the SAE/LTE network state; In the LTE-IDLE state, the user can also be paged, so it is also possible to define a new state in addition to the existing three states.
  • MM and SM context can be determined by the operator policy, for example, by setting a dedicated timer, after the timer expires Delete the corresponding MM and SM context (or delete the MM or SM context separately), release the SAE/LTE bearer resources, and change the UE state to LTE-DETACHED; in this scenario, it may involve and policy (PCC)
  • PCC policy
  • the UE is terminated in the MM and SM contexts of the PS core network, and the corresponding bearer is released.
  • the state of the UE in the SAE/LTE network is changed to the LTE-DETACHED state.
  • bearers with active SM status may be reserved, and the MM and SM contexts of the UE in the PS network are not deleted (or the MM or SM context is not deleted separately), and the UE is in the PS core network.
  • the status is still in the LTE-IDLE state, but a special identifier is required to indicate that the UE is currently Fallback to the CS domain.
  • the UE is not allowed to perform new uplink/downlink PS services on the PS network. For this state, whether a new one is defined.
  • Status and The retention times of the MM and SM contexts are the same as described above; in this scenario, interaction with the PCC may be involved, and RAT changes, QoS degradation, etc. may be notified.
  • the UE is deleted from the MM and SM contexts of the PS network (or the MM or SM context is deleted separately), and the state of the UE in the PS core network is changed to the LTE-DETACHED state.
  • the bearer with the SM state in Active including the default bearer
  • the method of releasing all may be adopted, or it may be handed over to the PS domain of the target network.
  • the above UE UE state transition in the PS network can be implemented by processes such as Handover, RAU (Routing Area Location Update), LU (Location Update) or Detach (De-attachment).
  • the PS service that the UE is performing can be transferred to the PS domain of the target network to continue the service only when the target network supports the PS service capability.
  • the following methods are used to know whether the target network supports PS services:
  • the network side informs the UE whether the legacy network supports the PS service. If the legacy network supports the PS service capability, the network side may also inform the UE of the strength of the traditional network to support the PS service capability.
  • the PS domain network entity for example, MME
  • MME the PS domain network entity notifies the capability/strongness according to the network configuration when attached to the PS domain network, or may be notified by a traditional network entity (such as an MSC) when attached to the CS domain.
  • MME the PS domain network entity
  • MSC traditional network entity
  • eNB Evolved NodeB
  • the capability of the neighboring 2G/3G cell to support the PS service is sent to the UE through the broadcast message. If the legacy network supports the PS service capability, the eNB may also broadcast the legacy network support PS service capability to the UE. Strength. When the CS Fallback is required, the UE performs the above processing on the PS domain service according to whether the legacy network has the PS service capability or the strength of the PS service capability.
  • the PS domain network core network entity informs the UE of the ability of the legacy network to support the PS service through the NAS (non-access stratum) message or paging (Paging) message, the UE According to this, the PS business is transferred to the target network.
  • NAS non-access stratum
  • Paging paging
  • the UE may send a message to the core network device of the PS domain network (such as a service request). Request message), TAU (Tracking Area Update Message)) to restore the bearer in the original packet domain, thereby re-continuing the original PS service.
  • a message such as a service request.
  • Request message such as a service request.
  • TAU Track Area Update Message
  • the state transition of the above UE in the PS core network is applicable to both the MT (Mobile Terminated) process and the MO (Mobile Originated) process, except that the MT is The called party and the MO are called, and the former has more paging procedures than the latter.
  • the UE and the PS domain core network must forward the information back to the 2G/3G CS domain through the signaling interaction UE to make the PS domain core network perform corresponding processing. From the timing consideration, it can be before the Fallback. If you exchange these information, you can also exchange the information after the Fallback. However, if you exchange these information after Fallback, the disadvantages are relatively large.
  • CS Fallback Request/Response messages can also be implemented by adding corresponding cells to existing messages, such as: Messages such as Paging Response, Handover Required, or Setup. Increase the CS Fallback indicator cell.
  • the Paging Response can be sent as follows:
  • the UE After the UE receives the Paging, it sends the packet to the source MSC through the PS network.
  • the Paging Response is carried in a subsequent message, and may be carried in the PS message and forwarded to the MSC, or may be carried in the CS domain message;
  • the UE When the UE has Fallback to the CS domain, the UE responds to the paging in the CS domain of the target network. The message is sought, and then a call signalling connection of a CS domain is started.
  • the eNB may trigger the handover according to the measurement report from the UE, or may be implemented by using a blind cut method, that is, the handover is not triggered according to the measurement report from the UE. Directly initiate the switching process.
  • the specific application example 1 of the method of the embodiment of the present invention in the network architecture shown in FIG. 1 is described below. If the target network supports the PS service, when the UE receives the paging message with the paging cause as the voice call in the LTE-CONNECTED state, the UE will establish a virtual voice call bearer in the LTE network, and the SAE/LTE network is in progress respectively. The PS service and the CS voice service are transferred to the packet domain and the circuit domain of the target 2G/3G network, that is, PS switching and CS switching are simultaneously performed. After the PS handover ends, the UE initiates the RAU process.
  • the UE deletes the MM and SM context of the SAE/LTE network (or separately deletes the MM or SM context), thereby setting the state of the UE in the SAE/LTE network. LTE - DETACHED status.
  • the UE starts voice traffic in the circuit domain of the target network. Specifically as shown in Figure 4.
  • step 401 to step 402 the MSC sends a CS Call Paging message through the IWF to page the UE.
  • step 403 the UE completes the connection of the circuit domain call signaling with the MSC through the IWF. Since the target network supports the PS service, the UE starts the handover of the PS and the CS at the same time (it may be that the handover is initiated according to the measurement report may also be a blind cut). ). The Paging Response message may be sent in the handover message of the step.
  • step 404 after performing PS handover, the UE initiates a RAU procedure.
  • step 405 the UE performs an optional security procedure with the network.
  • the SGSN instructs the HSS to update the user related information, and the HSS will The MME is notified to delete the user-related information and the MME initiates the release of the UE's bearer resources in the LTE network, so that the state of the user in the SAE/LTE network is changed to LTE-DETACHED.
  • Steps 409-410 are optional.
  • the embodiment of the present invention prefers not to release the core network resources allocated by the core network for the UE, because (1) the UE is in the LTE-CONNECTED state, and the PS service is being performed. From the perspective of business continuity, it is inclined not to replace the Serving GW; (2) Because CS Fallback is required to initiate CS voice service, it is not because of mobility, and it is unlikely that the UE moves out of the Serving GW range. Serving GW There is little chance of a change.
  • the target network when the target network supports the PS service, the ongoing PS service of the SAE/LTE network and the CS voice service that is just connected are transferred to the packet domain and the circuit domain of the target 2G/3G network, that is, the PS is simultaneously performed. Switching and CS switching, so that the UE can still perform the original PS service after CS Fallback, so that the user can obtain a good service experience.
  • the target network does not support the PS service
  • the original PS service is terminated (the UE changes the state of the SAE/LTE network to LTE-DETACHED, And releasing the corresponding bearer) or suspending (the UE transitions to the LTE-IDLE state in the SAE/LTE network state), and in the case of suspension, the MME is required to send an indication that the UE has rolled back to the CS, and the MME immediately receives the indication.
  • the SAE/LTE network air interface and the S1 interface resource are released. If there is downlink data of the UE during this period, the MME does not page the UE. Specifically, as shown in steps 501 to 512 in FIG.
  • the IWF will be used to establish the circuit domain call signaling.
  • the network does not support the PS service.
  • the UE can notify the LTE network to suspend the ongoing PS service (the UE changes state of the SAE/LTE network to LTE-IDLE) or terminates (the state of the UE in the SAE/LTE network) Change to LTE - DETACHED).
  • the UE needs to notify the MME to temporarily release the LTE bearer of the UE before the CS handover or the start of the handover, and does not page the UE when the UE has downlink data. You can tell the MME to start doing this in the following message:
  • the MME obtains an indication of performing reservation or release on the LTE bearer of the user by parsing the Call Confirm message;
  • the MME After receiving the HO REQUIRED message, the MME performs an operation of retaining or releasing the LTE bearer;
  • the UE Before starting the handover, the UE sends a NAS message to the MME to instruct the MME to perform the operation of retaining or releasing the bearer;
  • MM and SM contexts are stored in the SAE/LTE network
  • how long the MM and SM contexts (MM or SM context) are stored in the SAE/LTE network can be determined by the operator policy, for example, by setting a dedicated timer, after the timer expires.
  • the corresponding context will be removed, the bearer will be released, and the UE state will be converted to LTE-DETACHED.
  • the detachment and state change of the UE from the SAE/LTE network can be implemented by using the method of Detach from the SAE/LTE network.
  • the UE can directly initiate the Detach Request after deciding to perform the CS Fallback. Request
  • the MSC may also notify the MME to delete the corresponding context and release the bearer through the IWF after the Fallback to the CS.
  • the ongoing PS service may be suspended, so that the UE can quickly resume the original PS service after being re-arranged to the SAE/LTE network;
  • the PS service can avoid the waste of resources caused by the PS domain network resources still occupied when the user is camped on the traditional network.
  • Example 3 when the UE is in the LTE-IDLE state, the Paging Cause is received as a voice call or a CS paging message marked from the CS domain or an active CS voice call, because the UE needs to be in the SAE first.
  • the LTE network is changed to the LTE-CONNECTED state, and then switched to the 2G/3G network. Therefore, the method for the UE to fall back to the CS domain is similar to that of Embodiment 2, and the bearer of the UE in the SAE/LTE network can be released or retained ( The method is the same as in the example 2).
  • the ongoing PS service may be suspended, so that the UE can quickly resume the original PS service when the UE is re-arranged to the SAE/LTE network;
  • the PS service is performed, thereby avoiding waste of resources caused by the PS domain network resources still being occupied when the user is camped on the legacy network.
  • the paging message is received as the voice call, and the UE needs to be rolled back to the CS domain to establish the CS call, and if the SAE/LTE network can also be used in the SAE/LTE network.
  • the ongoing PS service is transferred to the PS domain of the 2G/3G network, and the PS Handover (PS domain handover) can be used.
  • the UE can trigger the UE to report the measurement report, and the eNB sends a handover request message to the MME according to this, and can also perform blind handover.
  • the method implementation) and the subsequent triggered RAU/LU process implement CS Fallback, ie: transfer the ongoing traffic of the SAE/LTE network to the PS domain of the 2G/3G network through PS Handover, and then the UE will initiate the joint RAU/LU
  • the process after the RAU/LU succeeds, deletes the MM and SM context of the UE in the SAE/LTE network, thereby setting the state of the UE in the SAE/LTE network to LTE DETACHED status.
  • CS Fallback ie: transfer the ongoing traffic of the SAE/LTE network to the PS domain of the 2G/3G network through PS Handover, and then the UE will initiate the joint RAU/LU
  • the process after the RAU/LU succeeds, deletes the MM and SM context of the UE in the SAE/LTE network, thereby setting the state of the UE in the SAE/LTE network to LTE DETACHED status.
  • Figure 6 As shown in Figure 6.
  • step 601 to step 602 the MSC sends a paging message to the MME, and the MME triggers paging to the UE.
  • the embodiment uses the MME to send to the source MSC after receiving the Paging, and may also reply in the CS domain after the CS Fallback is performed. Reply after the location update is complete.
  • step 603 the PS service of the SAE/LTE network is transferred to the PS domain of the 2G/3G network through the PS Handover (which may be initiated according to the measurement report or may be blind).
  • step 604 to step 619 after the PS handover is completed, the UE initiates a joint location update process.
  • the MME and the SM context of the UE in the SAE/LTE network are deleted by the Cancle Location message in step 607, and the bearer of the UE in the SAE/LTE network is further released through steps 608 and 609 (if the Serving-GW does not change, only the UE is released.
  • the air interface and the S1 port carry resources without releasing the core network bearer resources, so that the state of the UE in the SAE/LTE network will be changed to the LTE-DETACHED state.
  • the embodiment prefers not to release the core network resources allocated by the core network for the UE, for two reasons: (1) The UE is in the LTE-CONNECTED state, and the PS service is in progress, from the perspective of service continuity. Considering that the Serving GW is not replaced; (2) The CS Fallback is performed by the UE because the CS voice service is not mobile, and the possibility that the UE moves out of the Serving GW range is small, and the Serving GW is unlikely to change.
  • step 614 and step 615 if no change of the MSC occurs, the two steps are not performed.
  • the ongoing PS service of the SAE/LTE network is transferred to the packet domain of the target 2G/3G network, so that the UE can still perform the original PS service after the CS Fallback. , enabling users to get a good business experience.
  • the specific application example 5 of the method of the embodiment of the present invention in the network architecture shown in FIG. 2 is described below.
  • the UE when the UE is in the LTE-CONNECTED state and receives the paging message with the paging cause being the voice call, the UE needs to be rolled back to the CS domain to establish the CS call. If the SAE/LTE network cannot be performed, If the PS service is switched to the 2G/3G network, the bearer in the SAE/LTE network can be reserved (so that the UE can quickly continue the original service when the UE re-arranges to the SAE/LTE network) or released, and the process of passing the LU will The UE rolls back to the CS domain. Specifically as shown in Figure 7.
  • the UE When the UE receives the paging request from the CS domain, the UE requests the MME to fall back to the CS domain through the CS Fallback Request message in step 703 and notify the MME to notify the MME before the CS Fallback is performed.
  • the LTE bearer resources are reserved or released. If the MME receives the message, it will release the air interface resource immediately, and according to the operator policy or the configuration timer, if there is downlink data of the user within the timer range, the MME will not page the user. When the timer expires, the MME will release the bearer resources of the user in the SAE/LTE network and convert the UE into the LTE-DETACHED state.
  • step 704 whether the bearer of the original SAE/LTE network is reserved or released can be implemented by:
  • the CS Fallback Request/Response message that the UE can interact with the MME in step 703 indicates that the MME reserves or releases the bearer of the SAE/LTE network; if reserved, sets the state of the UE in the SAE/LTE network to the LTE-IDLE state.
  • the MM & SM context of the UE in the SAE/LTE network is not deleted, and the core network bearer resources allocated by the SAE/LTE network for the UE are reserved; if released, the state of the UE in the SAE/LTE network is set to the LTE-DETACHED state.
  • step 705 the UE sends a Paging Response message to the MSC.
  • step 706 a CS voice call service is performed.
  • the ongoing operation may be suspended.
  • the PS service can be used to enable the UE to continue to relocate the original PS service when it is re-arranged to the SAE/LTE network.
  • the ongoing PS service can also be terminated, thereby preventing the user from occupying the PS network resource when camping on the legacy network. Waste of resources.
  • the UE is in the LTE-IDLE state, and the target network does not support the PS service.
  • the CS Fallback can be implemented through the process of the LU.
  • the UE maintains the LTE IDLE state in the SAE/LTE state while retaining the UE in the SAE/LTE.
  • the MM & SM context of the network is such that the UE can continue the original service after the UE is switched back to the SAE/LTE network from the CS domain, and a special identifier is needed to indicate that the UE is currently Fallback to the CS domain and temporarily does not allow the UE to be in SAE/LTE.
  • the network performs new uplink/downlink PS services.
  • the UE may be directly detached from the SAE/LTE network.
  • the implementation may be triggered by the UE or the MME before the Fallback, or may be notified by the MSC to delete the context/release load after the Fallback to the CS. Specifically as shown in Figure 8.
  • step 801 after receiving the IAM (Initial Address Message) message, the source MSC sends a Paging Request message to the MME, and then the MME pages the UE in the SAE/LTE network.
  • the Paging Response is immediately after receiving the Paging. Reply, you can also reply in the manner described above;
  • step 802 the UE and the MME inform each other of the need for the CS Fallback and the suspension or termination of the PS service, and further trigger the reservation or release of the PS bearer by the MME.
  • step 803 if the bearer is reserved, the update process of the bearer may be triggered, for example: The MBR/GBR (Maximum Bit Rate/Guaranteed Bit Rate) value is reduced to 0 and so on.
  • MBR/GBR Maximum Bit Rate/Guaranteed Bit Rate
  • step 804 to step 812 the UE is rolled back to the CS domain by the LU procedure.
  • the SM & MM context is not deleted, and the UE is still in the LTE-IDLE state in the SAE/LTE state, and the special identifier is temporarily not performed on the PS uplink/downlink. business. How long the SM & MM context is reserved on the core network side can be achieved by setting a timer mechanism.
  • the ongoing PS service may be suspended, so that the UE can quickly resume the original PS service when the UE is re-arranged to the SAE/LTE network;
  • the PS service is performed, thereby avoiding waste of resources caused by the PS domain network resources still being occupied when the user is camped on the legacy network.
  • the UE receives the CS page from the network side when the UE is in the LTE-IDLE state, and the target network supports the PS service, and the gp: can transfer the service of the SAE/LTE network to the target network, and
  • the RAU/LU procedure implements the transfer of services and bearers and the state transition of the UE in SAE/LTE, while deleting the MM & SM context of the UE in the SAE/LTE network. See Figure 9 for details.
  • step 901 after receiving the IAM message, the source MSC sends a Paging Request message to the MME, and then the MME pages the UE in the SAE/LTE network.
  • the Paging Response returns immediately after receiving the Paging, and may also be used. Reply in the manner described above;
  • step 902 the UE and the MME mutually know the information that the other party needs to perform CS Fallback and transfer the PS service to the PS domain of the target network;
  • steps 903 to 926 the UE is rolled back to the CS domain by a joint RAU/LU procedure. Because the target network supports the PS service, the foregoing process deletes the MM & SM context of the UE in the SAE/LTE through steps 913a to 913c, thereby setting the state of the UE in the SAE/LTE network to the LTE DETACHED state, and 913b is optional, and the reason is the same.
  • Example 4 In the above embodiment The MSC has also changed, so after completing the RAU, the process of the LU is also required. In the process, step 918 is to delete the context in the source MSC.
  • the related operations and state changes of the UE in the SAE/LTE network can also be implemented through the Detach process.
  • the ongoing PS service of the SAE/LTE network is transferred to the packet domain of the target 2G/3G network, so that the UE can still perform the original PS service after the CS Fallback. , enabling users to get a good business experience.
  • the system in the embodiment of the present invention may further include other numerous entities that implement the communication function, and the technologies that may be disclosed in other prior art belong to the communication.
  • the details of the technology in the field are not described in detail in the embodiment; however, in order to introduce the implementation in the embodiment of the present invention, only the main part of the system is pointed out here.
  • the system includes: a network side 1010 and a terminal side 1020 capable of communicating with the network side 1010, where the terminal side 1020 can include:
  • the user equipment 1021 is configured to obtain packet domain service processing capability information of the target network, and determine whether to transfer the packet domain service to the target network, when receiving the circuit domain paging or performing another call setup process.
  • the user equipment 1021 includes:
  • the calling unit 10211 is configured to receive a circuit domain paging message or perform another call setup process.
  • the determining unit 10212 is configured to obtain packet domain service processing capability information of the target network, and determine whether to transfer the packet domain service to the target network.
  • the processing unit 10213 is configured to perform a packet domain service processing process according to the indication of the determining unit.
  • the judgment condition of the judging unit is one or a combination of the following: the target network has the packet domain service processing capability; the target network does not have the packet domain service processing capability; and the user equipment needs its own service.
  • the program can be instructed to execute related hardware, and the program can be stored in a computer readable storage medium.
  • the program includes the following steps:
  • the user equipment located in the packet domain receives the circuit domain paging. Or performing other call setup procedures, acquiring packet domain service processing capability information of the target network, and determining whether to transfer the packet domain service to the target network.
  • the predetermined condition is one of the following or any combination thereof: the target network has packet domain service processing capability; the target network does not have packet domain service processing capability; and the user equipment needs its own service.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Landscapes

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

Abstract

L'invention porte sur un procédé de traitement de service de domaine à commutation de paquet (PS). Le procédé comprend les opérations suivantes : le dispositif utilisateur situé dans le domaine PS obtient les informations concernant la capacité de traitement de service de domaine PS du réseau de destination après avoir reçu l'appel de domaine à commutation de circuit (CS) ou au cours de l'établissement de l'appel sinon, détermine de transférer le service de domaine PS au réseau de destination ou non. L'invention porte également sur un dispositif utilisateur et sur un système de communication mobile.
PCT/CN2008/073779 2008-02-02 2008-12-26 Procédé, appareil et système de traitement de service de domaine à commutation de paquet WO2009097733A1 (fr)

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