WO2011140777A1 - Procédé et dispositif permettant de libérer rapidement des ressources côté source lors d'un transfert intercellulaire - Google Patents

Procédé et dispositif permettant de libérer rapidement des ressources côté source lors d'un transfert intercellulaire Download PDF

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Publication number
WO2011140777A1
WO2011140777A1 PCT/CN2010/077261 CN2010077261W WO2011140777A1 WO 2011140777 A1 WO2011140777 A1 WO 2011140777A1 CN 2010077261 W CN2010077261 W CN 2010077261W WO 2011140777 A1 WO2011140777 A1 WO 2011140777A1
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Prior art keywords
enb
source enb
handover
source
target enb
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PCT/CN2010/077261
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English (en)
Chinese (zh)
Inventor
彭聪
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中兴通讯股份有限公司
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Publication of WO2011140777A1 publication Critical patent/WO2011140777A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0027—Control or signalling for completing the hand-off for data sessions of end-to-end connection for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release

Definitions

  • the present invention relates to a handoff technology of a Long Term Evolution (LTE) mobile communication system, and in particular, to a method and apparatus for quickly releasing a source side resource.
  • LTE Long Term Evolution
  • Mobility management is an important attribute of mobile communication systems, and handover is the key content of mobility management. Reasonable handover behavior can reduce the overhead that the system pays for mobility.
  • the state of the user equipment (UE, User Equipment) is divided into two types: a connected state (RRC CON ECTED ) and an idle state ( RRC IDLE ).
  • RRC CON ECTED connected state
  • RRC IDLE idle state
  • the handover is divided into handover within the evolved Node B (eNB, Evolved NodeB), and handover between the eNBs.
  • the handover in the eNB means that the source cell and the target cell of the handover are located in the same eNB; the handover between the eNBs means that the source cell and the target cell of the handover are located in different eNBs.
  • the switching frequency is divided into the same frequency switching and the different frequency switching. From the perspective of whether the wireless technology used by the UE changes before and after the handover, the handover is further divided into an intra-LTE handover and an LTE inter-system handover.
  • the handover between the eNBs is divided into X2 interface switching and S1 interface switching, whether the handover angle is required to be completed through the EPC (Evolved Packet Core), or the switching occurs between the S1 interface and the X2 interface.
  • the service gateway S-GW, Serving Gateway
  • the handover is further divided into the S-GW changed handover and the S-GW unchanged handover.
  • the EPC has two core device entities, one is the Mobility Management Entity (MME), which is responsible for the control of the control plane signaling; the other is the S-GW, which is responsible for the user plane signaling processing and is responsible for the user's GRPS tunneling protocol.
  • MME Mobility Management Entity
  • S-GW Serving Mobility Management Entity
  • GTP-U GPRS Tunnelling Protocol User Plane Tunnel management.
  • GTP-U GPRS Tunnelling Protocol User Plane Tunnel management.
  • the eNB establishes at least one GTP-U tunnel with the S-GW.
  • One end of the tunnel is on the user plane entity of the eNB, and the other end is on the S-GW.
  • the uplink service data is sent by the UE to the user plane of the eNB, and then sent by the user to the S-GW.
  • the downlink service data is sent by the S-GW to the user plane of the eNB,
  • handover is initiated and initiated by the eNB.
  • the S-GW needs to change the downlink transmission path after the UE switches to the target eNB, and no longer sends data to the source eNB, but starts to send data to the target eNB. The initial stage of the handover occurs.
  • the S-GW does not know that the UE will handover to the target eNB, and also transmits downlink data to the source eNB, and the source eNB has downlink data that has not been sent to the UE and is received from the UE side but has not yet received Data sent to the S-GW. In order to ensure non-destructive handover of data, no packet loss of service data occurs.
  • uplink data and downlink data are established between the source eNB and the target eNB for each E-RAB (E-UTRAN Radio Access Bearer).
  • E-RAB E-UTRAN Radio Access Bearer
  • the user plane channel transmits the uplink and downlink data received by the source eNB but not yet transmitted to the target eNB, which is called data back propagation.
  • the S-GW After the air interface UU ends the handover procedure, the S-GW will get the path conversion notification and then change the downlink data transmission path.
  • the target eNB needs to first send the reversed data to the UE, and then send the data received from the S-GW to the UE.
  • the S-GW will immediately send one or more EndMarker packets for each E-RAB of the UE after changing the transmission path.
  • the end flag packet does not contain user data and carries an end flag in the GTP header.
  • the S-GW no longer sends user data to the source eNB after transmitting the end marker packet.
  • the source eNB transmits the packet to the target eNB if there is data back-transmission on the bearer.
  • the target eNB When the target eNB detects the end flag packet, it discards the packet and then starts to reverse the X2 port. The data is transmitted and the data received from the S-GW is delivered in order, and the data back-transmission resource is released. After the handover is completed, in order to notify the source eNB to release the UE-related resources, the target eNB sends a UE Context Release message (X2 handover) to the source eNB after the handover succeeds, or sends a Handover Notify message to the MME, and then sends the UE Context Release to the source eNB by the MME. Command message (SI).
  • SI UE Context Release message
  • the source eNB may release the radio and control plane related resources, but if the data backhaul has not ended, it may continue, so the user plane resources cannot be released. And when to release user-side resources becomes a problem in the prior art. Properly setting the timing for releasing resources will ensure full utilization of the source eNB user plane resources and complete transmission of back-transmission data. Summary of the invention
  • An object of the present invention is to provide a method for quickly releasing a resource on a switching source side.
  • the timing of releasing the user plane resource is selected by detecting the end flag packet at the source eNB, thereby ensuring data reverse. Successful completion of the transmission and timely release of user resources.
  • Another object of the present invention is to provide a device for quickly releasing a resource on a switching source side, and selecting a timing for releasing a user plane resource by detecting an end flag packet at a source eNB, thereby ensuring smooth completion of data backhaul and timely time of user plane resources. freed.
  • a method for quickly releasing a source side resource comprising:
  • the source eNB determines whether the end marker packet delivered by the S-GW has been received from the bearer of all data backhauls;
  • the source eNB determines that the end flag packet is not received from the bearer of all data backhaul, the data back propagation timer is started, and when the data backhaul timer expires, all resources related to the UE are immediately released; If the source eNB determines that the end marker packet is received from the bearer of the partial data back-off before the data back-off timer expires, releasing the bearer-related user plane resource of the partial data back-transmission; if the data is back-transmitted Before the device times out, the source eNB judges that the end flag packet is received from the bearer of all data backhaul, and immediately releases all resources related to the UE.
  • the S-GW that sends the end marker packet is the same S-GW that the UE participates in handover during the handover process from the source eNB to the target eNB.
  • the source eNB when the source eNB receives the UE context release message, it immediately releases the UE-related radio resources and control plane resources.
  • the handover process of the UE from the source eNB to the target eNB is a handover procedure initiated by using an interface X2 between the source eNB and the target eNB.
  • the method further includes: when the UE needs to handover from the source eNB to the target eNB, the source eNB sends a handover request to the target eNB and receives a handover request acknowledgement returned by the target eNB. And sending the uplink and downlink data back to the target eNB, and sending a handover command to the UE, so that the UE accesses the target eNB;
  • the target eNB After the UE accesses the target eNB, the target eNB sends a path change request message to the mobility management entity (MME), so that the MME notifies the serving gateway S-GW to change its downlink data transmission path;
  • MME mobility management entity
  • the S-GW After receiving the notification from the MME that the downlink data transmission path is changed, the S-GW returns a change of the downlink data transmission path response to the MME, stops sending the downlink data of the UE to the source eNB, and starts sending the information to the target eNB. Downlink data of the UE, and sending an end flag packet to the source eNB on the bearer of all data backhauls;
  • the MME After receiving the change of the downlink data transmission path response returned by the S-GW, the MME sends a path change request acknowledgement message to the target eNB, so that the target eNB sends a UE context release message to the source eNB.
  • the method further includes: The target eNB is notified to release user plane resources related to data back propagation.
  • the handover process of the UE from the source eNB to the target eNB is a handover procedure initiated by the interface S 1 between the source eNB and the target eNB and the core gateway.
  • the method before the source eNB receives the UE context release message, the method further includes: when the UE needs to switch from the source eNB to the target eNB, the source eNB sends a message that needs to be handed over to the MME, and then the MME sends the handover to the target eNB. And requesting and receiving a handover request acknowledgement message returned by the target eNB, and sending a handover request command to the source eNB;
  • the source eNB After receiving the handover request command sent by the MME, the source eNB sends a handover command to the UE, and sends a reverse data transmission to the target eNB through the S-GW.
  • the target eNB After the UE accesses the target eNB according to the handover command issued by the source eNB, the target eNB sends a handover notification to the MME, so that the MME notifies the S-GW to change its downlink data transmission path; and the S-GW receives the MME from the MME. After changing the notification of the downlink data transmission path, returning to the MME to change the downlink data transmission path response, stopping sending the downlink data of the UE to the source eNB, starting to send the downlink data of the UE to the target eNB, and back-transferring all the data. Sending an end flag packet to the source eNB respectively on the bearer;
  • the MME After receiving the change of the downlink data transmission path response returned by the S-GW, the MME sends a UE context release message to the source eNB.
  • an apparatus for quickly releasing a source side resource is provided, where the apparatus is disposed in a source eNB, including:
  • the receiving judging module is configured to: when receiving the UE context release message, whether a judgment result of the end flag packet end flag packet sent by the serving gateway S-GW is received from the bearer backed by all the data;
  • a resource release module configured to release all resources related to the UE according to the judgment result of receiving the end flag packet on the bearer of all data backhauls made by the receiving judging module;
  • the backhaul bearer receives the judgment result of the end flag packet, starts timing, and starts the resource release module to release all resources related to the UE when the timer expires;
  • the resource release module releases the partial data inversion according to the judgment result of the bearer receiving the end flag packet from the bearer of the partial data back-reduction made by the receiving judging module. Carrying the relevant user plane resource, or immediately receiving all the resources related to the UE according to the judgment result of receiving the end flag packet from the bearer of all data backhauls made by the receiving judgment module.
  • the apparatus further includes a notification module, configured to notify the target eNB to release the user plane resource related to the data back-off after the source eNB releases all the user plane resources of the UE.
  • the beneficial effects of the present invention are: in the case that the S-GW does not change, regardless of the S1 handover and the X2 handover, the source eNB can release the user plane correlation in time while ensuring the normal completion of data back propagation.
  • Resources such as RBID, transmission resources, etc., can not only reduce the packet loss process, but also reduce the overhead of the system to achieve mobility, and effectively improve the system resource utilization.
  • FIG. 1 is a schematic diagram of an apparatus for quickly releasing a source side resource according to the present invention
  • FIG. 2 is a schematic diagram showing a method for quickly releasing a source side resource according to the present invention
  • FIG. 3 is a schematic diagram showing a method for rapidly releasing a source side resource by using the X2 port to initiate handover according to the present invention
  • FIG. 4 is a schematic diagram showing a method for quickly releasing a source side resource by using the S1 port to initiate handover according to the present invention
  • FIG. 5 is a schematic diagram showing an interface relationship between a UE, an eNB, an MME, and an S-GW in which X2 handover occurs;
  • FIG. 6 is a schematic diagram showing an interface relationship between a UE, an eNB, an MME, and an S-GW in which an S1 handover occurs;
  • Figure 7 is a schematic view showing first and second embodiments of the method of the present invention
  • Figure 8 is a schematic diagram showing a third embodiment of the method of the present invention. detailed description
  • FIG. 1 shows an apparatus for quickly releasing a source side resource according to the present invention.
  • the apparatus is disposed in a source eNB, and any eNB in the LTE system may become a source eNB. Therefore, the apparatus is generally disposed in all eNBs.
  • the device for quickly releasing the switching source side resource includes: a receiving determining module, configured to: when receiving the UE context release message, whether to have received the end delivered by the serving gateway S-GW from the bearer of all data backhaul a judgment result of the flag packet; a resource release module, configured to release all resources related to the UE according to the judgment result of receiving the end flag packet on the bearer of all data back-transmissions made by the receiving judgment module;
  • a data back-emission timer configured to start timing according to the determination result that the receiving judgment module does not receive the end flag packet from the bearer of all data back-transmission, and start the resource release module to release the time when the timing expires All resources related to the UE;
  • the resource release module releases the partial data inversion according to the judgment result of the bearer receiving the end flag packet from the bearer of the partial data back-reduction made by the receiving judging module. Carrying the relevant user plane resource, or immediately receiving all the resources related to the UE according to the judgment result of receiving the end flag packet from the bearer of all data backhauls made by the receiving judgment module.
  • the apparatus of the present invention further includes a notification module, configured to notify the target eNB to release user plane resources related to data back-transmission after the source eNB releases all UE user resources.
  • the receiving judging module is connected to the resource releasing module, and is configured to send the judging result to the resource releasing module, so that the resource releasing module performs corresponding operations according to the judgment result, such as releasing all resources related to the UE and releasing the radio resources related to the UE.
  • User plane resources related to control plane resources releasing bearers of one or more data backhaul.
  • the receiving judgment module also connects the data back-transfer
  • the timer is configured to start the data back-emission timer according to the judgment result of the end flag packet on the bearer that has not received all the data back-transmission before receiving the user context release message.
  • the data back-off timer is connected to the resource release module, and is configured to start the resource release module to release all resources related to the UE when the timer expires.
  • the resource release module connection notification module is configured to release all resources related to the UE, and the resource notification module is started to send a user plane resource related to data back propagation to the target eNB.
  • FIG. 2 shows a method for quickly releasing a source side resource according to the present invention.
  • the method for quickly releasing a source side resource according to the present invention includes the following steps:
  • Step 201 During the handover process of the user equipment UE from the source eNB to the target eNB, when the source eNB receives the UE context release message, it determines whether the service gateway S-GW has been received from all the data backhauled bearers. The end flag package issued;
  • Step 202 When the source eNB determines that the end flag packet has been received from the bearer of all data backhaul, directly release all resources related to the UE; or, when it is determined that the end flag packet is not received from the bearer of all data backhauling , starting the data back-off timer, and immediately releasing all resources related to the UE when the data back-off timer expires;
  • Step 203 Before the data backhaul timer expires, if the source eNB determines that the end marker packet is received from the bearer of the partial data backhaul, releasing the user plane resource related to the bearer of the partial data backcast; or if the source The eNB determines that the end marker packet is received from the bearer of all data backhauls, and immediately releases all resources related to the UE.
  • the S-GW that sends the end flag packet is the same S-GW that the UE participates in handover during the handover process from the source eNB to the target eNB. That is to say, the S-GW does not change, that is, the S-GW that sends data to the US before the handover and the S-GW that sends the data to the UE after the handover are the same S-GW.
  • FIG. 3 shows a method for quickly releasing a source side resource by using the X2 port to initiate handover, where steps A1 - A4 are steps before the source side resource is quickly released. As shown in Figure 3, the following steps are included:
  • the source eNB transmits a handover request to the target eNB (see flow 3 of FIG. 3) and receives a handover request acknowledgement returned by the target eNB. (See the flow of Figure 5 in Figure 3), start to send the uplink and downlink back-transmission data to the target eNB (see the flow of Figure 3) and the status of the subframe number (see Figure 8 and Figure 8), and send the handover command to the UE (see Figure 3 6), enabling the UE to access the target eNB;
  • the target eNB After the UE accesses the target eNB (see the flow of FIG. 3), the target eNB sends the path change request message to the MME (see process 10 in FIG. 3), so that the MME notifies the service gateway S- by sending a user plane update request.
  • GW changes its downlink data transmission path (see flow chart 11 in Figure 3);
  • the MME After receiving the change downlink data transmission path response returned by the S-GW (see the flow of FIG. 3), the MME sends the path change request acknowledgement message to the target eNB (see process 13 in FIG. 3), so that the target eNB sends the target eNB to the source eNB.
  • a UE-related radio resource and control plane resource message that is, a UE context release message (see FIG. 3 and FIG. 13);
  • the source eNB immediately releases the radio resources and control plane resources related to the UE after receiving the release message of the radio resource and the control plane resource related to the UE (see flowchart 15 in FIG. 3), and releases according to the received Before the message, the source eNB receives the end label on the radio bearer of the UE.
  • the receiving status of the aging packet is released in the timer timeout release mode or the immediate release mode, that is, the user plane resource related to the UE is released, that is, the user plane resource related to the UE is released or released immediately (see flowchart 18 in FIG. 3).
  • step A5) further includes: after the source eNB releases the user plane resource, sending an end flag packet to the target eNB, and notifying the target eNB to release the user plane resource related to the backhaul (see FIG. 3, process 17).
  • the user plane resource related to the UE is released according to the timer timeout release manner of the foregoing step A5), including the following substeps:
  • the data back-transmission protection timer of the source eNB is started. And releasing the user plane resource related to the one or more radio bearers if the end marker packet on the one or more radio bearers of the UE is received before the data back propagation protection timer expires, if All the resources related to the UE are released when the end flag packet on all radio bearers of the UE is collected;
  • the data back-transmission protection of the source eNB is started. a timer, and if the end flag packet on one or more radio bearers of the UE is received before the data back propagation protection timer expires, releasing the user plane resources related to the one or more radio bearers If the data backhaul protection timer expires and the end flag packet on all radio bearers of the UE has not been received, all resources related to the UE are directly released.
  • the release of the UE-related user plane resource in the immediate release manner of the foregoing step A5) includes the following sub-steps:
  • the receiving status is an end flag packet on all radio bearers of the UE, all resources related to the UE are directly released.
  • the source eNB needs to perform handover from the source eNB to the target. The decision of the eNB.
  • the target eNB when the target eNB receives the handover request from the source eNB, the target eNB will save the UE related information and perform admission control.
  • FIG. 4 is a flowchart of a method for quickly releasing a source side resource by using an S1 interface to initiate a handover according to the present invention.
  • Steps B1 - B5 are steps before the source side resource is quickly released, as shown in FIG. The following steps:
  • the source eNB When the UE needs to handover from the source eNB to the target eNB, that is, when the UE reports a measurement report indicating that the signal quality of the target eNB is better than the signal quality of the source eNB and is higher than a predetermined threshold, the source eNB will make a need to perform the source from the source.
  • the eNB switches to the decision of the target eNB (see flowchart 1-2 of FIG. 4), and the source eNB sends a message to the MME that needs to be handed over (see process 3 in FIG. 4), and then the MME sends a handover request to the target eNB (see process 4 in FIG. 4). And receiving a handover request acknowledgement message returned by the target eNB (see FIG. 4 and FIG. 6), and sending a handover request command to the source eNB (see flowchart 7 in FIG. 4);
  • the source eNB After receiving the handover request command sent by the MME (see the flowchart of FIG. 4), the source eNB sends a handover command to the UE (see flowchart 8 in FIG. 4), and sends the reverse transmission data to the target eNB through the S-GW (see Figure 4 flow 9-10);
  • the target eNB After the UE accesses the target eNB according to the handover command sent by the source eNB (see the flow of FIG. 4), the target eNB sends a handover notification to the MME (see the process 12 in FIG. 4), so that the MME sends the modify bearer request. Notifying the S-GW to change its downlink data transmission path (see Figure 13 and Figure 13);
  • the MME After receiving the change of the downlink data transmission path response returned by the S-GW (see the process of FIG. 4), the MME sends a message to the source eNB to release the radio resource and the control plane resource related to the UE by sending the UE context release request. (See Figure 16 in Figure 16);
  • the source eNB After receiving the release message of the radio resource and the control plane resource related to the UE, the source eNB immediately releases the radio resource and control plane resources related to the UE (see FIG. 4 and FIG. 7), and releases according to the received Before the message, the source eNB receives the receiving status of the end flag packet on the radio bearer of the UE, and releases the user plane resource related to the UE according to the timer timeout release mode or the immediate release mode, that is, timeout release or immediate release of the UE Related user plane resources (see Figure 19, Flow 19).
  • the user plane resource related to the UE is released according to the timer timeout release manner of the foregoing step B6), including the following substeps:
  • the data back-transmission protection timer of the source eNB is started. And releasing the user plane resource related to the one or more radio bearers if the end flag packet on the one or more radio bearers of the UE is received before the data back propagation protection timer expires, if All the resources related to the UE are released when the end flag packet on all radio bearers of the UE is collected;
  • the data back-transmission protection of the source eNB is started. a timer, and if the end flag packet on one or more radio bearers of the UE is received before the data back propagation protection timer expires, releasing the user plane resources related to the one or more radio bearers If the data backhaul protection timer expires and the end flag packet on all radio bearers of the UE has not been received, all the resources related to the UE are directly released. Source. The following substeps:
  • the receiving status is an end flag packet on all radio bearers of the UE, all resources related to the UE are directly released.
  • the radio bearer of the UE includes one or more AM mode radio bearers transmitting uplink and downlink data and one or more UM mode radio bearers transmitting downlink data.
  • Figure 5 shows the interface relationship between the UE, the eNB, the MME, and the S-GW where the X2 port is switched.
  • Figure 6 shows the interface relationship between the UE, the eNB, the MME, and the S-GW.
  • Figure 7 shows the actual flow of a fast-release switching source-side resource using the X2 port to initiate a handover.
  • Figure 8 shows the actual flow of a fast-release switching source-side resource using the S1 interface to initiate a handover.
  • Example 1 a method for quickly releasing a source side resource by using the X2 port to initiate a handover and a fast release switching source side resource using the S1 port to initiate a handover are performed by using three specific embodiments. The method is described in detail.
  • Example 1
  • the connection relationship between the UE, the eNB, the MME, and the S-GW of the X2 handover in which the S-GW does not change is established.
  • the UE in the RRC connection state establishes two bearers, and one of the bearer transmission modes is the AM mode.
  • the transmission mode of another bearer is UM mode. See Figure 7 for this embodiment.
  • Step 101 The UE detects that the signal quality of a cell in the target eNB is higher than a certain threshold of the serving cell, and reports the A3 event (see the flow of FIG. 7).
  • the source eNB determines that the UE needs to perform the X2 handover to the target eNB. (See Flow 2 of Figure 7), a Handover Request message is sent to the target eNB (see Flow 3 of Figure 7).
  • the target eNB After receiving the UE, the target eNB saves the UE related information, performs admission and local resource preparation (see Figure 4, Flow 4), and then Sending a Handover Request Acknowledge message to the source eNB (see FIG. 7 and FIG. 5), which carries information such as a local transport layer address, a TEID, and a handover command forwarded by the source eNB to the UE.
  • Step 102 The source eNB receives the handover request acknowledgement message, sends the handover command to the UE (see flowchart 6 in FIG. 7), and then starts to send the backhaul data to the target eNB (see flow diagram 7 in FIG. 7) and the subframe number.
  • State Transfer SN Status Transfer
  • the uplink and downlink data are back-transmitted on the bearer of the AM mode, and the downlink data is only reversed on the bearer of the UM mode.
  • Step 103 The UE receives the handover command and accesses the target eNB (see the flow of FIG. 7).
  • the target eNB sends a Path Switch Request message to the MME (see flowchart 10 in FIG. 7), and carries the E that needs to be switched.
  • the MME sends a User Plane Update Request notification to the S-GW (see Flow 11 of Figure 7) which changes the downlink data transmission path.
  • Step 104 After receiving the user plane update request, the S-GW stops transmitting the downlink data of the UE to the source eNB, starts sending downlink data of the UE to the target eNB, and returns a user plane update response to the MME (User Plane Update Response) ) (See Figure 12, Flow 12).
  • MME User Plane Update Response
  • an end flag packet is immediately sent to the source eNB on each bearer (see flowchart 16 in FIG. 7).
  • Step 105 The bearer of the AM mode of the source eNB receives the end flag packet, and sets the flag (EndMarkFlag) of the end flag packet associated with the bearer to 1; the end of the UM mode of the source eNB receives the end flag packet, and judges all bearers. When the end flag packet is received, the flag of whether the UE receives the end flag packet of all bearers is set to 1.
  • Step 106 The MME sends a Path Switch Request Acknowledge message to the target eNB (see the flowchart of FIG. 7). After receiving the target eNB, the UE sends a UE Context Release message to the source eNB (see FIG. 7). Flow 14), informing it to release the radio resource and control plane related resources related to the UE, and the source eNB receives the UE context After the message is released, the UE-related radio resource and control plane related resources are released (see Figure 15 and Figure 15).
  • Step 107 The source eNB receives the UE context release message, and if the EndMarkFlag is 1, the data back-off timer is not started, and all user plane resources related to the UE are directly released (see flowchart 17 in FIG. 7), and the handover succeeds.
  • Example 2
  • the connection relationship between the UE, the eNB, the MME, and the S-GW of the X2 handover in which the S-GW does not change is established, and two bearers are established on the UE in the RRC connection state, and the transmission mode of one bearer is the AM mode.
  • the transmission mode of another bearer is UM mode. See Figure 7 for this embodiment.
  • Step 201 The UE detects that the signal quality of a cell in the target eNB is higher than a certain threshold of the serving cell, and reports the A3 event (see the flow of FIG. 7).
  • the source eNB determines that the UE needs to perform the X2 handover to the target eNB. (See Flowchart 2 of Figure 7), a Handoff Request message is sent to the target eNB (see Flow 3 of Figure 7).
  • the target eNB After receiving the UE, the target eNB saves the UE related information, performs admission and local resource preparation (see FIG. 7 and FIG. 4), and then sends a handover request acknowledgement message to the source eNB (see FIG. 7 and FIG. 5), where the local transport layer address is carried.
  • TEID information such as a handover command forwarded to the UE by the source eNB.
  • Step 202 The source eNB receives the handover request acknowledgement message, sends the handover command to the UE (see process 6 in FIG. 7), and then starts to send the backhaul data to the target eNB (see FIG. 7 and FIG. 7) and the subframe number.
  • State transfer see flow chart 8 in Figure 7
  • the uplink and downlink data are back-transmitted on the bearer of the AM mode, and the downlink data is only reversed on the bearer of the UM mode.
  • Step 203 The UE receives the handover command and accesses the target eNB (see the flow of FIG. 7).
  • the target eNB sends a path change request message to the MME (see process 10 in FIG. 7), and carries the E-RAB information that needs to be switched.
  • the S-GW is sent a user plane update request to notify it to change the downlink data transmission path (see flow chart 11 of FIG. 7).
  • Step 204 After receiving the user plane update request, the S-GW stops sending the downlink data of the UE to the source eNB, starts sending downlink data of the UE to the target eNB, and returns a user plane update response to the MME (refer to the process in FIG. 7). 12).
  • an end flag packet is sent to the source eNB on each bearer (see flowchart 16 in FIG. 7).
  • Step 205 The MME sends a path change request acknowledgement message to the target eNB (see FIG. 7 and the process 13). After receiving the target eNB, the target eNB sends a UE context release message to the source eNB, and informs the UE to release the radio resource and control plane related resources related to the UE. After receiving the UE context release message, the source eNB performs release of the UE-related radio resource and control plane related resources (see flowchart 14 in FIG. 7).
  • Step 206 The source eNB receives the UE context release message, and if the EndMarkFlag is 0, the UE only releases the radio resources related to the UE and the control plane related resources (see flowchart 15 in FIG. 7), but does not release the user plane related resources, and starts. Data back propagation protection timer.
  • Step 207 The bearer of the AM mode of the source eNB receives the end flag packet, and the source eNB releases the user plane resource related to the bearer.
  • Step 208 The bearer of the UM mode of the source eNB receives the end flag packet, and the source eNB releases the user plane resource related to the bearer, and determines that all bearers receive the end flag packet, and then release all user plane resources related to the UE. The switch was successful.
  • the connection relationship between the UE, the eNB, the MME, and the S-GW of the S1 handover in which the S-GW does not change is as shown in FIG. 6.
  • Three bearers are established on the UE in the RRC connection state, and one of the bearer transmission modes is the AM mode.
  • the transmission mode of the other two bearers is UM mode.
  • the flow of this embodiment is shown in Fig. 8.
  • Step 301 The UE detects that the signal quality of a cell in the target eNB is higher than a certain threshold than the signal quality of the serving cell, and reports an A3 event (see FIG. 8 and FIG. 1), and the source eNB determines the UE.
  • the S1 handover to the target eNB is required (see the flow of FIG. 8), and the Handover Required message is sent to the MME (see the flowchart of FIG. 8), which carries the Source to Target transparent container, the reason for the handover, and the like.
  • the pass path is indicated as an indirect back pass.
  • Step 302 ⁇ Send a handover request message to the target eNB after receiving the handover request message (see Figure 4, Flow 4).
  • the target eNB After receiving the UE, the target eNB saves the relevant information of the UE, performs the admission and local resource preparation (see the flowchart of FIG. 8), and then sends a handover request acknowledgement message to the MME (see the flowchart of FIG. 8), where the local transport layer address and the TEID are carried. And information such as a handover command forwarded by the source eNB to the UE.
  • Step 303 The MME sends a Handover Command message to the source eNB (see the process of Figure 8), which carries the target to source transparent container and other cells sent by the source eNB.
  • the source eNB sends the handover command to the UE (see process 8 in FIG. 8), and then starts sending back data to the S-GW (see FIG. 8 and FIG. 9), and the S-GW transmits the signal to the target eNB.
  • the uplink and downlink data are back-transmitted on the bearer of the AM mode, and the downlink data is only back-transmitted on the bearer of the UM mode.
  • Step 304 The UE receives the handover command and accesses the target eNB (see process 11 in FIG. 8), and the target eNB sends a Handover Notify message to the MME (see FIG. 8 and FIG. 12), and the MME sends the S-GW.
  • a Modify Bearer Request message is sent to inform it to change the downlink data transmission path (see Flow of Figure 13 of Figure 8).
  • Step 305 After receiving the modify bearer request message, the S-GW stops sending downlink data of the UE to the source eNB, starts sending downlink data of the UE to the target eNB (see process 14 in FIG. 8), and returns tampering to the MME. Modify Bearer Response (see Figure 15 Flow 15). To help the target eNB perform reordering of the downlink data, an end flag packet is immediately sent to the source eNB on each bearer (see flowchart 18 in FIG. 8).
  • Step 306 The bearer of the AM mode of the source eNB receives the end flag packet, and the source eNB releases the user plane resource related to the bearer.
  • the bearers of both UE modes have not been received due to an abnormality.
  • the flag package, the exceptions here include but are not limited to the transmission layer link disconnection, packet loss due to signal quality, and the like.
  • Step 307 The MME sends a UE context release message to the source eNB (see the process in Figure 8).
  • Step 308 The data back propagation protection timer expires, and the source eNB releases all local resources related to the UE (see process flow in FIG. 8), and the handover succeeds.
  • the user data packet sent from the S-GW is detected, and if an E-RAB is found, When the end flag packet is reached, the E-RAB related resource is released after the end flag packet is back-transmitted to the target eNB. If all E-RABs are released, the UE's user plane related other resources are released.
  • the S1 handover and the X2 handover source eNB can release the user plane related resources, such as the RBID, in time to ensure that the data back propagation is normally completed, if the S-GW does not change.
  • Transmission resources, etc. can not only reduce the packet loss process, but also reduce the overhead of the system to achieve mobility, effectively improve the system resource utilization, and optimize the overall network.

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

Abstract

La présente invention se rapporte à un procédé et à un dispositif permettant de libérer rapidement des ressources côté source lors d'un transfert intercellulaire. Le procédé comprend les étapes suivantes : après réception d'un message de libération de contexte d'équipement utilisateur (UE), le nœud B évolué (eNB) source détermine si les paquets d'indicateur final ont été reçus de tous les supports pour une transmission de données ; si c'est le cas, le nœud eNB source libère toutes les ressources associées à l'UE ; sinon, le nœud eNB source active un temporisateur de transmission de données et libère immédiatement toutes les ressources associées à l'UE lorsque le temporisateur expire ; avant que le temporisateur de transmission de données n'expire, si le nœud eNB source détermine que lesdits paquets d'indicateur final ont été reçus d'une partie des supports, alors il libère les ressources de plan utilisateur associées à la partie des supports ; ou si le nœud eNB source détermine que lesdits paquets d'indicateur final ont été reçus de tous les supports, alors il libère immédiatement toutes les ressources associées à l'UE.
PCT/CN2010/077261 2010-05-14 2010-09-25 Procédé et dispositif permettant de libérer rapidement des ressources côté source lors d'un transfert intercellulaire WO2011140777A1 (fr)

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CN106900017B (zh) * 2015-12-21 2021-04-02 中兴通讯股份有限公司 数据反传方法及装置
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