CN101730032A - Method for realizing data forwarding and donor base station - Google Patents
Method for realizing data forwarding and donor base station Download PDFInfo
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Abstract
The invention discloses a method for realizing data forwarding, and a donor base station. The method comprises the following steps of: in a handover process of user equipment (UE), when a forwarding path of a bearer which needs to perform the data forwarding relates a Un interface between the donor base station and a relay node, establishing one or more data radio bearers on the Un interface; establishing a one-to-one corresponding relation between the established data radio bearer and a general packet radio service tunneling protocol (GTP) tunnel on the forwarding path of the bearer which needs to perform the data forwarding; and performing forwarding on the bearer which needs to perform the data forwarding through the established data radio bearer and a corresponding GTP tunnel. The technical scheme of the invention can realize the data forwarding in the handover process of the UE when the forwarding path of the bearer which needs to perform the data forwarding relates to the Un interface.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of method and donor base station of realizing data forwarding.
Background technology
After Long Term Evolution (LTE, the Long Term Evolution) technology of 3GPP, the 3GPP tissue continues the LTE scheme is strengthened, and this technique for enhancing is called the LTE enhancing, and (promptly LTE-A is the follow-up evolution of LTE technology for LTE-A, LTE-Advanced) technology.
In the LTE-A technology, in the framework of Access Network, increased via node (RN, Relay Node).RN can be regarded as the extension of evolution base station (eNB), for system provides more economical covering.RN is connected by wave point with eNB, and it can strengthen covering quality at the edge that eNB covers, and also can dispose the scope of expanding covering outside the eNB overlay area.
Fig. 1 is the schematic diagram of the RN in existing LTE-A networking.As shown in Figure 1, for providing the eNB of wireless access service, RN is called donor base station (DeNB, Donor eNB); Be connected by wireless Un interface between RN and the DeNB, the Uu interface by LTE between RN and the subscriber equipment (UE) is connected; Mobility Management Entity/the gateway of DeNB and core net (MME/SGW, Mobility Management Entity/Serving Gateway) is connected to UE by the S1 interface provides service; The MME/SGW of RN and core net is connected to UE by the S1 interface service is provided.
In Fig. 1, for the connection of S1 interface, shown two kinds of scenes: a kind of S1 of being interface terminates in DeNB, shown in solid line among the figure, for the UE under the DeNB provides service; Another kind is that the S1 interface terminates in RN, and as shown in phantom in FIG., for the UE under the RN provides service, this S1 interface need pass through the DeNB transfer.For a kind of scene in back, the S1 control plane terminates in RN by the transfer of DeNB, and the S1 user plane directly terminates in DeNB, and promptly DeNB is as the forward node of S1 interface signaling and the terminal node of S1 user plane data transmission.
The transfer menu of DeNB is present, and S1 Application Protocol (S1AP) signaling and user plane data all arrive DeNB earlier, and DeNB also knows has signaling and data to arrive, and can resolve even revise them, is transmitted to RN or core net afterwards again.
Fig. 2 is the S1 interface control plane protocol stack schematic diagram in the framework shown in Figure 1.Fig. 3 is the S1 interface user plane protocols stack schematic diagram in the framework shown in Figure 1.S1 interface control plane terminates in RN, and by the DeNB transfer, DeNB can revise the partial content in the S1AP signaling.The S1 interface user plane terminates in DeNB, during down direction, the data in general packet wireless service tunnel protocol (GTP, the GPRS Tunnel Protocol) tunnel solve from the tunnel at DeNB, transmit by Un interface data radio bearer (DRB, Date Radio Bearer); The data that up direction transmits at Un interface DRB are bundled at DeNB and are transferred to core net in the GTP tunnel.According to above-mentioned Architecture characteristic, the S1 interface signaling of UE is respectively at RN and DeNB, and the transmission of the control plane between DeNB and the MME, and S1AP is carried by Radio Resource control (RRC, Radio Resource Control) agreement on the Un interface.The S1 interface user data of UE is respectively at RN and DeNB, and the user-plane transmissions between DeNB and the SGW.RN is exactly a sub-district under the DeNB for core net, can only see DeNB and UE for UE provides the core net of service, does not consider whether RN exists.
In existing LTE-A correlative study, for the X2 interface between the eNB, generally set X2 interface and the S1 interface has similar protocol stack structure, promptly X2 application protocol (X2AP) terminates in RN, provides the transfer service by DeNB; X2-U terminates in DeNB, reuses the X2 interface of having set up between DeNB and the eNB.X2 interface protocol stack under this setting is shown in Figure 4 and 5.Fig. 4 is an X2 interface control plane protocol stack schematic diagram.Fig. 5 is an X2 interface user-plane protocol stack schematic diagram.
Fig. 6 is the signaling process figure that UE switches to target eNB in the prior art from source RN.The X2AP signaling is carried transmission by RRC message on the Un interface, because SGW and PDN Gateway (PGW) may be separate equipment, also may be arranged in the equipment, and all be the node on the user plane path, therefore S GW and PGW are shown in the square frame, then as shown in Figure 6, may further comprise the steps:
Step 601 is after source RN receives the RRC measurement report of UE transmission, according to analyzing the handoff procedure of decision startup to this UE.
Step 602, source RN forms the X2AP signaling: handoff request (Handover Request) message; RN is carried at handoff request (Handover Request) message in uplink information transmission (UL Information Transfer) message of RRC and sends the source DeNB that the wireless access service is provided for source RN to then.
Step 603, source DeNB sends handoff request (HandoverRequest) message to target eNB, and target eNB is returned Handover Request Acknowledge (Handover Request ACK) message to source DeNB after finishing the switchable resource preparation.
Step 604, source DeNB is with the X2AP signaling: Handover Request Acknowledge (HandoverRequest ACK) message is carried to pass in downlink information transmission (DL InformationTransfer) message of RRC initiates the source RN that switches.
Step 605, source RN reshuffles (RRC Connection Reconfiguration) message by send the RRC connection that comprises switching command (HandoverCommand) to UE, require UE to switch to goal systems, and the correlated series information of those carryings of changeing before needs are carried out send by SN state transfer message from origin system.Meanwhile, source RN stops to transmit downlink data to UE.
Here the RN downlink data that receives and be buffered among the RN that UE need be failed in source is forwarded to target eNB, and this process is called the data forwarding process.
Step 606, UE sends RRC to target eNB and connects to reshuffle and finish (RRCConnection Reconfiguration Complete) message, target eNB finish and SGW/PGW between the path conversion.
Step 607, after UE inserts goal systems, related resource in the deletion origin system, be specially: target eNB sends the UE context to DeNB and discharges (UE Context Release) message, source DeNB sends to source RN and comprises downlink information transmission (DL Information Transfer) message that the UE context discharges (UE ContextRelease) message, finishes RRC between DeNB and the RN and is connected reconfiguration course.Arrive this, switching flow finishes.
In the step 603 of above-mentioned flow process, target eNB comprises in the switching request acknowledgement message that source DeNB sends: target eNB is that the carrying (UEEPS carrying) of the needs execution data forwarding of UE distributes the address information of the data forwarding tunnel on X2 interface (referring to the interface between source DeNB and the target eNB).The transport layer address of forwarding tunnel in target eNB of the EP S carrying of having changeed before this address information has indicated each to treat.After source DeNB receives the switching request acknowledgement message of target eNB transmission, set up corresponding forward-path (GTP-U tunnel) according to transport layer address wherein, so that source RN will successfully not send the downlink grouped of UE to and be transmitted to target eNB, after being connected to target eNB, UE sends to UE from target eNB again.
Though existing method has roughly provided under the above-mentioned framework implementation based on data forwarding in the changing method of X2 interface and the handoff procedure, does not indicate data forwarding from details and how on earth realizes.Especially only adopt existing scheme can not on the Un interface, realize the preceding commentaries on classics of data.For example, on the Un interface, after receiving the switching request acknowledgement message that target eNB sends, DeNB can not directly be transmitted to RN, because the user plane of Un interface is not supported the GTP agreement, the GTP address of carrying in the switching request acknowledgement message can't be used to set up the transmission channel of data forwarding for RN, but those information that UE does not receive have only RN just to know again, and data forwarding can only be initiated by RN.In addition, when UE switches to RN from eNB, or UE switches to from RN under the scene of another RN and has the problems referred to above.
In sum, in the existing LTE-A system that comprises RN, in the UE handoff procedure, when the forward-path that need carry out the carrying of data forwarding relates to Un interface between DeNB and the RN, can not realize data forwarding.
Summary of the invention
The invention discloses a kind of method that realizes data forwarding, this method when the forward-path that need carry out the carrying of data forwarding relates to Un interface between DeNB and the RN, can normally realize data forwarding in the UE handoff procedure.
The invention also discloses a kind of DeNB, this DeNB makes in the UE handoff procedure, when the forward-path that need carry out the carrying of data forwarding relates to Un interface between DeNB and the RN, can normally realize data forwarding.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of method that realizes data forwarding, this method is applied to comprise in the Long Term Evolution enhancing LTE-A system of via node RN, in the user equipment (UE) handoff procedure, when the forward-path that need carry out the carrying of data forwarding related to Un interface between donor base station DeNB and the RN, this method comprised:
On the Un interface, set up more than one Data Radio Bearer DRB; Wherein the quantity of the DRB that is set up is identical with the carrying quantity that described needs carry out data forwarding;
General packet wireless service tunnel protocol GTP tunnel on the forward-path of the carrying that the DRB that set up and described needs are carried out data forwarding is set up one-to-one relationship; The quantity of wherein said GTP tunnel is identical with the carrying quantity that described needs carry out data forwarding;
The carrying that described needs are carried out data forwarding is passed through respectively to walk around before the DRB that set up and corresponding GTP tunnel carry out and is sent out.
The invention also discloses a kind of DeNB, this DeNB comprises: DRB sets up module, relating module and preceding revolving die piece, wherein,
DRB sets up module, is used for the handoff procedure at UE, when the forward-path that the needs of UE carry out the carrying of data forwarding relates to Un interface between described DeNB and its subordinate's the RN, sets up more than one Data Radio Bearer DRB on this Un interface; Wherein, the quantity of the DRB that is set up is identical with the carrying quantity that described needs carry out data forwarding;
Relating module is used for the GTP tunnel that DRB sets up on the forward-path of the carrying that DRB that module sets up and described needs carry out data forwarding is set up one-to-one relationship; The quantity of wherein said GTP tunnel is identical with the carrying quantity that described needs carry out data forwarding;
Preceding revolving die piece, be used to receive the carrying of carrying out data forwarding from the needs of described GTP tunnel, and according to the one-to-one relationship between DRB and the GTP tunnel, the carrying that is received is transmitted by corresponding DRB, and/or, be used to receive the carrying of carrying out data forwarding from the needs of described DRB, and, the carrying that is received transmitted by corresponding GTP tunnel according to the one-to-one relationship between DRB and the GTP tunnel.
As seen from the above technical solution, the present invention is this to set up more than one DRB on the Un interface, and the GTP tunnel on the forward-path of the carrying that the DRB that set up and described needs are carried out data forwarding is set up one-to-one relationship, the technical scheme of walking around and sending out before the DRB that set up and corresponding GTP tunnel carry out is passed through in the carrying of then needs being carried out data forwarding respectively, when the forward-path that carries out the carrying of data forwarding at needs relates to Un interface between DeNB and the RN, can normally realize data forwarding.
Description of drawings
Fig. 1 is the schematic diagram of the RN in existing LTE-A networking;
Fig. 2 is the S1 interface control plane protocol stack schematic diagram in the framework shown in Figure 1;
Fig. 3 is the S1 interface user plane protocols stack schematic diagram in the framework shown in Figure 1;
Fig. 4 is an X2 interface control plane protocol stack schematic diagram;
Fig. 5 is an X2 interface user-plane protocol stack schematic diagram;
Fig. 6 is the signaling process figure that UE switches to target eNB in the prior art from source RN;
Fig. 7 is the signaling process figure of UE when source RN switches to target eNB in the embodiment of the invention;
Fig. 8 is the signaling process figure of UE when source eNB switches to target RN in the embodiment of the invention;
Fig. 9 is the signaling process figure of UE when source RN switches to target RN in the embodiment of the invention;
Figure 10 is the signaling process figure based on S1 interface of UE when source RN switches to target eNB in the embodiment of the invention;
Figure 11 is the composition structural representation of a kind of DeNB in the embodiment of the invention.
Embodiment
Core concept of the present invention is: in comprising the LTE-A system of RN, in the UE handoff procedure, when the forward-path that need carry out the carrying of data forwarding relates to Un interface between DeNB and the RN, on this Un interface, set up more than one Data Radio Bearer (DRB, Data Radio Bearer), the DRB that set up and described needs are carried out GTP tunnel on the forward-path of carrying of data forwarding and set up one-to-one relationship (quantity of DRB and GTP tunnel all to carry out the carrying quantity of data forwarding identical with described needs) here, the carrying of then described needs being carried out data forwarding is passed through respectively to walk around before the DRB that set up and corresponding GTP tunnel carry out and is sent out.
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Fig. 7 is the signaling process figure of UE when source RN switches to target eNB in the embodiment of the invention.As shown in Figure 7, this method may further comprise the steps:
Step 701～step 703 is identical with step 601～step 603.
Step 704 after source DeNB receives the switching request acknowledgement message of target eNB transmission, is set up corresponding GTP tunnel according to transport layer address wherein earlier between source DeNB and target eNB; Then, source DeNB by self with source RN between the Un interface on the initiation RRC be connected reconfiguration course, on this Un interface, set up more than one DRB, and set up the one-to-one relationship of the GTP tunnel between DRB and source DeNB and the target eNB.
In this step, source DeNB sets up more than one DRB on the Un interface process comprises: source DeNB sends the RRC connection to source RN and reshuffles (RRC ConnectionReconfiguration) message, and source RN reshuffles to source DeNB transmission RRC connection and finishes (RRC Connection Reconfiguration Complete) message.
In this step, all to carry out the quantity of carrying of data forwarding identical with the needs of UE for the quantity of the quantity of the GTP tunnel that source DeNB is set up and the DRB that is set up.And which carrying of UE need to be carried out to walk around before the data and is sent out, and the information such as transport layer address of setting up GTP tunnel for those carryings can obtain from Handover Request Acknowledge (Handover RequestACK) message, and this is same as the prior art.
In this step, the process that source DeNB sets up GTP tunnel is a prior art, and the detailed process that source DeNB sets up DRB by initiation RRC connection reconfiguration course is same as the prior art, is not repeating here.
Step 705 is with step 604.
Step 706 is with step 605.
Like this, source RN sends to source DeNB by the DRB that is set up on the Un interface respectively with the carrying that the needs of UE carry out data forwarding, again by source DeNB according to the corresponding relation between DRB that is set up and the GTP tunnel, will carry respectively and be transferred to target eNB by each GTP tunnel.
Step 707 is with step 606.
Step 708 is with step 607.
Fig. 8 is the signaling process figure of UE when source eNB switches to target RN in the embodiment of the invention.As shown in Figure 8, this method may further comprise the steps:
Step 801 is after source eNB receives the RRC measurement report of UE transmission, according to analyzing the handoff procedure of decision startup to this UE.
Step 802, source eNB sends handoff request (Handover Request) message to the target DeNB that the wireless access service is provided for target RN.
Step 803, target DeNB is carried at handoff request (Handover Request) message in downlink information transmission (DL Information Transfer) message of RRC and sends target RN to, and target RN is carried at Handover Request Acknowledge (Handover Request ACK) message in uplink information transmission (UL Information Transfer) message of RRC and passes to target DeNB.
Step 804, target DeNB after the switching request acknowledgement message that receives from target RN, self with target RN between the Un interface on initiate RRC and be connected reconfiguration course, set up more than one DRB.
In this step, target DeNB self with target RN between the Un interface on set up more than one DRB process comprise: target DeNB sends RRC to target RN and is connected and reshuffles (RRC Connection Reconfiguration) message, and target RN sends the RRC connection to target DeNB and reshuffles and finish (RRC Connection ReconfigurationComplete) message.
In this step, all to carry out the quantity of carrying of data forwarding identical with the needs of UE for the quantity of the DRB that target DeNB set up.And which carrying of UE need to be carried out to walk around before the data and is sent out, and the information such as transport layer address of setting up GTP tunnel for those carryings can obtain from Handover Request Acknowledge (Handover Request ACK) message, and this is same as the prior art.
Step 805, target DeNB sends Handover Request Acknowledge (HandoverRequest ACK) message to source eNB, and sets up more than one GTP tunnel between self and source eNB, and sets up the one-to-one relationship between the DRB on these GTP tunnels and the Un interface.
In this step, the quantity of carrying that the quantity of the GTP tunnel that target DeNB set up and the needs of UE carry out data forwarding is identical.The detailed process that target DeNB sets up GTP tunnel is a prior art.
Step 806, source eNB reshuffles (RRC Connection Reconfiguration) message by send the RRC connection that comprises switching command (HandoverCommand) to UE, require UE to switch to goal systems from origin system, and the correlated series information of needs being carried out preceding those carryings of changeing sends by SN state transfer message, meanwhile, source eNB stops to transmit downlink data to UE.
Like this, source eNB sends to target DeNB by GTP tunnel respectively with the carrying that needs carry out data forwarding, again by target DeNB according to the corresponding relation between DRB and the GTP tunnel, with the carrying send to target RN by the DRB that on the Un interface, is set up respectively.
Step 807, UE sends RRC to target RN and connects to reshuffle and finish (RRCConnection Reconfiguration Complete) message, target eNB finish and SGW/PGW between the path conversion.
Step 808, after UE inserts goal systems, related resource in the deletion origin system, be specially: target RN sends to target DeNB and comprises uplink information transmission (UL Information Transfer) message that the UE context discharges (UE ContextRelease) message, target DeNB sends the UE context to source eNB and discharges (UE Context Release) message, finishes RRC between target DeNB and the target RN and is connected reconfiguration course.Arrive this, switching flow finishes.
Fig. 9 is the signaling process figure of UE when source RN switches to target RN in the embodiment of the invention.As shown in Figure 9, this method may further comprise the steps:
Step 901 is after source RN receives the RRC measurement report of UE transmission, according to analyzing the handoff procedure of decision startup to this UE.
Step 902, source RN is carried at handoff request (Handover Request) message and sends in the uplink information message transfer (UL Information Transfer) of RRC to the source DeNB of wireless access service is provided himself.
903, source DeNB just handoff request (Handover Request) message sends to the target DeNB that the wireless access service is provided for target RN.
Step 904, target DeNB is carried at handoff request (Handover Request) message in downlink information transmission (DL Information Transfer) message of RRC and sends target RN to, and target RN is carried at Handover Request Acknowledge (Handover Request ACK) message in uplink information transmission (UL Information Transfer) message of RRC and passes to target DeNB.
Step 905, target DeNB after the switching request acknowledgement message that receives from target RN, self with target RN between the Un interface on initiate RRC and be connected reconfiguration course, set up more than one DRB.
In this step, target DeNB self with target RN between the Un interface on set up more than one DRB process comprise: target DeNB sends RRC to target RN and is connected and reshuffles (RRC Connection Reconfiguration) message, and target RN sends the RRC connection to target DeNB and reshuffles and finish (RRC Connection ReconfigurationComplete) message.
In this step, all to carry out the quantity of carrying of data forwarding identical with the needs of UE for the quantity of the DRB that target DeNB set up.And which carrying of UE need to be carried out to walk around before the data and is sent out, and the information such as transport layer address of setting up GTP tunnel for those carryings can obtain from Handover Request Acknowledge (Handover Request ACK) message, and this is same as the prior art.
Step 906, target DeNB sends Handover Request Acknowledge (HandoverRequest ACK) message to source DeNB, and between self and source DeNB, set up more than one GTP tunnel, and set up the one-to-one relationship between the DRB that is set up in these GTP tunnels and the step 905.
In this step, the quantity of carrying that the quantity of the GTP tunnel that target DeNB set up and the needs of UE carry out data forwarding is identical.The detailed process that target DeNB sets up GTP tunnel is a prior art.
907, source DeNB after the switching request acknowledgement message that receives from target RN, self with source RN between the Un interface on initiate RRC and be connected reconfiguration course, set up more than one DRB.And set up one-to-one relationship between these DRB and the GTP tunnel, GTP tunnel refers to the GTP tunnel between source DeNB and the target DeNB.
In this step, source DeNB self with source RN between the Un interface on set up more than one DRB process comprise: source DeNB sends RRC to source RN and is connected and reshuffles (RRCConnection Reconfiguration) message, and source RN sends the RRC connection to source DeNB and reshuffles and finish (RRC Connection Reconfiguration Complete) message.
In this step, all to carry out the quantity of carrying of data forwarding identical with the needs of UE for the quantity of the DRB that source DeNB is set up.And which carrying of UE need to be carried out to walk around before the data and is sent out, and the transport layer address information of setting up GTP tunnel for those carryings can obtain from Handover Request Acknowledge (Handover Request ACK) message.
908, source DeNB sends downlink information transmission (the DL Information Transfer) message of carrying Handover Request Acknowledge (HandoverRequest ACK) message to source RN.
Step 909, source RN reshuffles (RRC Connection Reconfiguration) message by send the RRC connection that comprises switching command (HandoverCommand) to UE, require UE to switch to goal systems from origin system, and the correlated series information of needs being carried out preceding those carryings of changeing sends by SN state transfer message, meanwhile, source RN stops to transmit downlink data to UE.
Like this, source RN sends to source DeNB by the DRB that source DeNB is set up respectively with the carrying that needs carry out data forwarding, source DeNB is according to DRB that self stands and the corresponding relation between the GTP tunnel, to carry respectively and be transferred to target DeNB by each GTP tunnel, DRB that is set up according to self by target DeNB and the corresponding relation between the GTP tunnel send to target RN by the DRB that self sets up respectively with carrying again.
Step 910, UE reshuffles to target RN transmission RRC connection and finishes (RRCConnection Reconfiguration Complete) message.
Step 911, after UE inserts goal systems, related resource in the deletion origin system, be specially: target RN sends to target DeNB and comprises uplink information transmission (UL Information Transfer) message that the UE context discharges (UE ContextRelease) message, target DeNB sends the UE context to source DeNB and discharges (UE Context Release) message, source DeNB sends to source RN and comprises downlink information transmission (DL Information Transfer) message that the UE context discharges (UE Context Release) message, target DeNB finish and SGW/PGW between path conversion, between target DeNB and the target RN and finish RRC between source DeNB and the source RN and be connected reconfiguration course.Arrive this, switching flow finishes.
In the above-described embodiment, be that example is illustrated technical scheme of the present invention with hand off signaling in the X2 interface transmission.But need to prove here, when hand off signaling when the control plane of S1 interface transmits, the solution of the present invention is suitable equally.Below illustrate.
Figure 10 is the signaling process figure based on S1 interface of UE when source RN switches to target eNB in the embodiment of the invention.As shown in figure 10, may further comprise the steps:
Step 1001 step is after source RN receives the RRC measurement report of UE transmission, according to analyzing the handoff procedure of decision startup to this UE.
Step 1002, source RN is carried at handoff request (Handover Request) message in uplink information transmission (UL Information Transfer) message of RRC and sends the source DeNB that the wireless access service is provided for source RN to.
Step 1003, source DeNB sends handoff request message by the S1 interface to MME, MME sends to target eNB by the S1 interface with handoff request message, and target eNB is returned switching request acknowledgement message by the S1 interface to MME, and MME sends to source DeNB by the S1 interface with switching request acknowledgement message.
Step 1004 after source DeNB receives the switching request acknowledgement message of MME transmission, is set up corresponding GTP tunnel according to GTP tunnel transport layer address wherein earlier between source DeNB and target eNB; Then, source DeNB by self with source RN between the Un interface on the initiation RRC be connected reconfiguration course, on this Un interface, set up more than one DRB, and set up the one-to-one relationship of the GTP tunnel between DRB and source DeNB and the target eNB.
In this step, source DeNB sets up more than one DRB on the Un interface process comprises: source DeNB sends the RRC connection to source RN and reshuffles (RRC ConnectionReconfiguration) message, and source RN reshuffles to source DeNB transmission RRC connection and finishes (RRC Connection Reconfiguration Complete) message.
In this step, all to carry out the quantity of carrying of data forwarding identical with the needs of UE for the quantity of the quantity of the GTP tunnel that source DeNB is set up and the DRB that is set up.Which send out and walk around before the carrying needs execution data of UE, and the information such as transport layer address of setting up GTP tunnel for those carryings can obtain from Handover Request Acknowledge (Handover RequestACK) message, in addition, the transport layer address of GTP tunnel is the target eNB distribution and is carried in the switching request acknowledgement message that these are same as the prior art.
Step 1005, source DeNB sends downlink information transmission (the DL Information Transfer) message of carrying Handover Request Acknowledge (HandoverRequest ACK) message to source eNB.
Step 1006, source RN reshuffles (RRC Connection Reconfiguration) message by send the RRC connection that comprises switching command (HandoverCommand) to UE, requires UE to switch to goal systems from origin system.
Like this, source RN sends to source DeNB by the DRB that is set up on the Un interface respectively with the carrying that the needs of UE carry out data forwarding, again by source DeNB according to the corresponding relation between DRB that is set up and the GTP tunnel, will carry respectively and be transferred to target eNB by each GTP tunnel.
Step 1007, UE sends RRC to target eNB and connects to reshuffle and finish (RRCConnection Reconfiguration Complete) message, target eNB sends handoff notification message to MME, target eNB finish and SGW/PGW between the path conversion.
Step 1008, after UE inserts goal systems, related resource in the deletion origin system, be specially: MME sends the UE context to source DeNB and discharges (UE Context Release) message, source DeNB sends to source RN and carries downlink information transmission (DL Information Transfer) message that the UE context discharges (UE ContextRelease) message, finishes RRC between source DeNB and the source RN and is connected reconfiguration course.Arrive this, switching flow finishes.
When UE switches to target RN and UE switches to from source RN under the situation of target RN from source eNB, the situation of hand off signaling when the control plane of S1 interface transmits can be similar according to the foregoing description, enumerates explanation here no longer one by one.
In addition, in the above-described embodiment, the GTP tunnel of walking on the X2 interface with the path of forwarding data is that example is illustrated, if the GTP tunnel (being the user plane on the S1 interface) on the S1 interface is walked in the path of forwarding data, then the solution of the present invention is suitable equally, at this moment, as long as the GTP tunnel on DRB on the Un interface and the S1 interface is set up one-to-one relationship.
Based on the foregoing description, next provide the composition structured flowchart of a kind of donor base station DeNB among the present invention.
Figure 11 is the composition structural representation of a kind of DeNB in the embodiment of the invention.As shown in figure 11, this DeNB comprises: DRB sets up module 1101, relating module 1102 and preceding revolving die piece 1103, wherein:
DRB sets up module 1101, be used for handoff procedure at UE, when the forward-path that the needs of UE carry out the carrying of data forwarding relates to Un interface between described DeNB and its subordinate's the RN, on this Un interface, set up more than one Data Radio Bearer DRB, with the DRB notice relating module of being set up 1102; Wherein, the quantity of the DRB that is set up is identical with the carrying quantity that described needs carry out data forwarding;
Relating module 1102 is used for the GTP tunnel that DRB sets up on the forward-path of carrying that DRB that module is set up and described needs carry out data forwarding is set up one-to-one relationship, with revolving die piece 1103 before this corresponding relation notice; The quantity of wherein said GTP tunnel is identical with the carrying quantity that described needs carry out data forwarding;
Preceding revolving die piece 1103, be used to receive the carrying of carrying out data forwarding from the needs of described GTP tunnel, and according to the one-to-one relationship between DRB and the GTP tunnel, the carrying that is received is transmitted by corresponding DRB, and/or, be used to receive the carrying of carrying out data forwarding from the needs of described DRB, and, the carrying that is received transmitted by corresponding GTP tunnel according to the one-to-one relationship between DRB and the GTP tunnel.
DeNB as shown in figure 11, when UE when described DeNB provides the source RN of wireless access service to switch to target eNB: DRB sets up module 1101, be used for after the switching request acknowledgement message that receives from target eNB or MME, on the Un interface between described DeNB and the source RN, set up more than one DRB; Before revolving die piece 1103, be used for carrying out the carrying of data forwarding, and according to the one-to-one relationship between DRB and the GTP from the needs that described DRB reception sources RN sends, the carrying that the received GTP tunnel by correspondence is sent to target eNB.
DeNB as shown in figure 11, when UE when source eNB switches to described DeNB the target RN of wireless access service is provided: DRB sets up module 1101, be used to receive after the switching request acknowledgement message from target RN, on the Un interface between self and the target RN, set up more than one DRB; Before revolving die piece 1103, be used for carrying out the carrying of data forwarding, and according to the one-to-one relationship between DRB and the GTP from the needs that described GTP tunnel reception sources eNB sends, the carrying that the received DRB tunnel by correspondence is sent to target RN.
DeNB as shown in figure 11, described DRB sets up module 1101, is used for connecting reconfiguration course by initiating RRC, sets up more than one DRB on the Un interface.
In sum, the present invention is this to set up more than one DRB on the Un interface, and the GTP tunnel on the forward-path of the carrying that the DRB that set up and described needs are carried out data forwarding is set up one-to-one relationship, the technical scheme of walking around and sending out before the DRB that set up and corresponding GTP tunnel carry out is passed through in the carrying of then needs being carried out data forwarding respectively, when the forward-path that carries out the carrying of data forwarding at needs relates to Un interface between DeNB and the RN, can normally realize data forwarding.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. method that realizes data forwarding, this method is applied to comprise in the Long Term Evolution enhancing LTE-A system of via node RN, it is characterized in that, in the user equipment (UE) handoff procedure, when the forward-path that need carry out the carrying of data forwarding related to Un interface between donor base station DeNB and the RN, this method comprised:
On the Un interface, set up more than one Data Radio Bearer DRB; Wherein the quantity of the DRB that is set up is identical with the carrying quantity that described needs carry out data forwarding;
General packet wireless service tunnel protocol GTP tunnel on the forward-path of the carrying that the DRB that set up and described needs are carried out data forwarding is set up one-to-one relationship; The quantity of wherein said GTP tunnel is identical with the carrying quantity that described needs carry out data forwarding;
The carrying that described needs are carried out data forwarding is passed through respectively to walk around before the DRB that set up and corresponding GTP tunnel carry out and is sent out.
2. method according to claim 1 is characterized in that, when UE is when source RN switches to target evolution base station eNB,
Describedly setting up more than one DRB on the Un interface be: provide the source DeNB of wireless access service receiving after the switching request acknowledgement message from target eNB or Mobility Management Entity MME for source RN, on the Un interface between self and the source RN, set up more than one DRB;
GTP tunnel is set up one-to-one relationship and is on the forward-path of the described carrying that the DRB that set up and described needs are carried out data forwarding: source DeNB sets up one-to-one relationship with the GTP tunnel between the DRB that set up and self and the target eNB;
The described carrying that needs are carried out data forwarding is passed through respectively to walk around to send out before the DRB that set up and corresponding GTP tunnel carry out: source RN is after the switching request acknowledgement message that receives from source DeNB, needs are carried out the DRB that the carrying of data forwarding passes through respectively to be set up send to source DeNB, again by source DeNB according to the corresponding relation between DRB that is set up and the GTP tunnel, will carry respectively and be transferred to target eNB by each GTP tunnel.
3. method according to claim 1 is characterized in that, when UE when source eNB switches to target RN,
Describedly setting up more than one DRB on the Un interface be: provide the target DeNB of wireless access service receiving after the switching request acknowledgement message from target RN for target RN, on the Un interface between self and the target RN, set up more than one DRB;
Describedly GTP tunnel on the forward-path of the DRB that set up and the carrying that need carry out data forwarding is set up one-to-one relationship be: target DeNB is setting up DRB, and will send to from the switching request acknowledgement message of target RN after the eNB of source, the GTP tunnel between the DRB that set up and self and the source eNB is set up one-to-one relationship;
The described carrying that needs are carried out data forwarding is passed through the DRB that set up and corresponding GTP tunnel respectively and transmitted and be: source eNB sends to target DeNB by GTP tunnel respectively with the carrying that needs carry out data forwarding, again by target DeNB according to the corresponding relation between DRB and the GTP tunnel, the DRB that passes through respectively to be set up sends to target RN with carrying.
4. method according to claim 1 is characterized in that, when UE is when source RN switches to target RN, wherein, source RN provides the wireless access service with target RN by different DeNB,
Describedly setting up more than one DRB on the Un interface be: provide the target DeNB of wireless access service receiving after the switching request acknowledgement message from target RN for target RN, on the Un interface between self and the target RN, set up more than one DRB; With, the source DeNB that provides the wireless access service for source RN after the switching request acknowledgement message that receives from target DeNB, on the Un interface between self and the source RN, set up more than one DRB;
Describedly GTP tunnel on the forward-path of the DRB that set up and the carrying that need carry out data forwarding is set up one-to-one relationship be: target DeNB sets up one-to-one relationship with the GTP tunnel between the DRB that self sets up and self and the source DeNB; With, source DeNB the GTP tunnel between the DRB that self sets up and self and the target DeNB is set up one-to-one relationship;
The described carrying that needs are carried out data forwarding is passed through respectively to walk around to send out before the DRB that set up and corresponding GTP tunnel carry out: source RN carries out the DRB that the carrying of data forwarding set up by source DeNB respectively with needs and sends to source DeNB, source DeNB is according to DRB that self sets up and the corresponding relation between the GTP tunnel, to carry respectively and be transferred to target DeNB by each GTP tunnel, DRB that is set up according to self by target DeNB and the corresponding relation between the GTP tunnel send to target RN by the DRB that self sets up respectively with carrying again.
5. according to each described method in the claim 1 to 4, it is characterized in that, describedly on the Un interface, set up more than one DRB and comprise: connect reconfiguration course by initiating radio resource control RRC, on the Un interface, set up DRB.
6. a donor base station DeNB is characterized in that, this DeNB comprises: DRB sets up module, relating module and preceding revolving die piece, wherein,
DRB sets up module, is used for the handoff procedure at UE, when the forward-path that the needs of UE carry out the carrying of data forwarding relates to Un interface between described DeNB and its subordinate's the RN, sets up more than one Data Radio Bearer DRB on this Un interface; Wherein, the quantity of the DRB that is set up is identical with the carrying quantity that described needs carry out data forwarding;
Relating module is used for the GTP tunnel that DRB sets up on the forward-path of the carrying that DRB that module sets up and described needs carry out data forwarding is set up one-to-one relationship; The quantity of wherein said GTP tunnel is identical with the carrying quantity that described needs carry out data forwarding;
Preceding revolving die piece, be used to receive the carrying of carrying out data forwarding from the needs of described GTP tunnel, and according to the one-to-one relationship between DRB and the GTP tunnel, the carrying that is received is transmitted by corresponding DRB, and/or, be used to receive the carrying of carrying out data forwarding from the needs of described DRB, and, the carrying that is received transmitted by corresponding GTP tunnel according to the one-to-one relationship between DRB and the GTP tunnel.
7. DeNB according to claim 6 is characterized in that, when UE when described DeNB provides the source RN of wireless access service to switch to target eNB,
Described DRB sets up module, is used for after the switching request acknowledgement message that receives from target eNB or MME, sets up more than one DRB on the Un interface between described DeNB and the source RN;
Revolving die piece before described is used for carrying out the carrying of data forwarding from the needs that described DRB reception sources RN sends, and according to the one-to-one relationship between DRB and the GTP tunnel, and the carrying that the received GTP tunnel by correspondence is sent to target eNB.
8. DeNB according to claim 6 is characterized in that, when UE when source eNB switches to described DeNB the target RN of wireless access service is provided,
Described DRB sets up module, is used to receive after the switching request acknowledgement message from target RN, sets up more than one DRB on the Un interface between self and the target RN;
Revolving die piece before described is used for carrying out the carrying of data forwarding from the needs that described GTP tunnel reception sources eNB sends, and according to the one-to-one relationship between DRB and the GTP, and the carrying that the received DRB tunnel by correspondence is sent to target RN.
9. according to each described DeNB in the claim 6 to 8, it is characterized in that,
Described DRB sets up module, is used for connecting reconfiguration course by initiating RRC, sets up more than one DRB on the Un interface.
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