CN102131250B - A kind of data forwarding method based on wireless transmitting system and system - Google Patents
A kind of data forwarding method based on wireless transmitting system and system Download PDFInfo
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Abstract
The invention discloses a kind of data forwarding method based on wireless transmitting system, including: the user terminal (UE) under source via node (RN)/source Home eNodeB (HNB)/source home evolved node B (HeNB) needs to switch over, then HNB/ source, source RN/ source HeNB initiates handover request to its affiliated receiving base station (DeNB)/HNB gateway/HeNB gateway；DeNB/HNB gateway/HeNB gateway judges that UE needs to cut out from RN/ source, source HNB/ source HeNB, and target network element is agreed to receive described handover request, then the downlink user face data of UE are transmitted to target network element.The present invention also discloses a kind of data forwarding system based on wireless transmitting system accordingly.The present invention can reduce the downlink data transmission brought because of air interface time delay and interrupt, it is ensured that the seriality of UE business transmission during switching.
Description
Technical field
The present invention relates to Long Term Evolution (LongTermEvolution, LTE) technology and senior Long Term Evolution (LongTermEvolutionAdvance, LTE-A) technology, particularly relates to a kind of data forwarding method based on wireless transmitting system and system.
Background technology
Fig. 1 is the structural representation of cellular radio communication system in prior art, as shown in Figure 1, cellular radio communication system is mainly made up of terminal, access network and core net, wherein, the network being made up of base station or base station and base station controller is referred to as wireless access network (RadioAccessNetwork, RAN), it is responsible for Access Layer affairs, such as the management of Radio Resource.Physics or connection in logic can be there is according to practical situation, such as the base station 1 in Fig. 1 and base station 2 or base station 1 and base station 3 between base station.Usually, each base station can connect with one or more than one core net node (CoreNetwork, CN)；Core net is responsible for Non-Access Stratum affairs, such as location updating etc., and is the anchor point in user face；Terminal (UserEquipment, UE) refers to can be with the various equipment of cellular radio communication network communication, such as mobile phone or notebook computer etc..
In cellular radio communication system, the wireless coverage of fixed base stations network is restricted due to various reasons, and the reasons such as the stop of wireless signal can be caused inevitably to exist in the covering of wireless network and cover leak by the most various building structure；Still further aspect, border district in community, due to weakening of wireless signal strength, and the interference of neighbor cell, the error rate cause UE communication quality is poor when cell edge, being wirelessly transferred is raised, in order to improve the coverage rate of data transfer rate, group mobility, casual network deployment, the handling capacity in cell edge area and the covering of new region, having a solution is to introduce a kind of wireless network node at cellular radio communication system, is referred to as relaying (Relay).
Relay is to have between other network nodes by the website of wireless link relay data function, also via node/relay station (RelayNode/RelayStation) it is, it is also possible to have control informational function, Fig. 2 is Relay schematic network structure, as in figure 2 it is shown, Relay network includes:
Grand (Macro) UE: the UE that base station directly services；
In RelayUE:Relay network, the UE of Relay service；
Direct transfer link (directlink): the wireless link between base station and UE, comprises up-downgoing (DL/ULdownlink/uplink) and direct transfers link；
Access link (accesslink): the wireless link between Relay and UE, comprises DL/UL access link；
Back haul link (backhaullink): the wireless link between base station and Relay, comprises DL/UL repeated link.
Relay can be by multiple method relay data, such as directly amplify the wireless signal that the base station received sends, or is carried out after the data receiver that base station is sent the process of correspondence, the bag being properly received is relayed to terminal, or base station and relaying cooperation send data to terminal, accordingly, Relay also can relay the data sent from terminal to base station.
In numerous trunk types, having a kind of relaying to be referred to as type one and relay (TypeIrelay), its feature is as follows:
UE cannot be distinguished by the community under relaying and fixed base stations, and i.e. relaying itself is from UE, it is simply that a community, and with the community under base station is as broad as long, this type of community is properly termed as relaying cell.There is the physical cell identity (physicalcellidentity of oneself relaying cell, PCI), the same with normal cells send broadcast, in UE resides in relaying cell, relaying cell can individually use to UE by allocation schedule Radio Resource, can be independent of the wireless resource scheduling of the base station participating in relaying, its base station that Donor base station, i.e. Relay are connected by backhaullink that is otherwise known as.Between interface and protocol stack and ordinary base station community and UE between relaying cell and RelayUE identical.
Type one Relay is referred to as Relay node (Relaynode, RN), and the eNB being responsible for access style one Relay is referred to as receiving base station (Donor-eNB, DeNB).
Air interface between RN and RelayUE is referred to as Uu interface.
Air interface between RN and DeNB is referred to as Un interface.
On Uu interface, all of radio access layer chain of command and user plane protocol end in RN.
On Un interface, at least include the compression of wireless medium access protocol (MAC), radio link control (RLC), head and decompression protocol (PDCP) protocol layer.
nullLTE system uses internet protocol-based (InternetProtocol，IP) flat architecture，Fig. 3 is LTE network configuration diagram，As shown in Figure 3，LTE system is by the Universal Terrestrial Radio Access Network (EvolvedUniversalTerrestrialRadioAccessNetwork of evolution，E-UTRAN)、CN node and other support nodes composition，Wherein，CN node includes: mobile management unit (MobilityManagementEntity，MME)、Gateway (ServingGateway，S-GW)，MME is responsible for mobile management、The process of Non-Access Stratum signaling、The chain of command related works such as the management of the mobile management context of user；S-GW is responsible for the transmission of UE user face data, forwarding and route handoff etc.；Logically interconnected by X2 interface between eNB, for supporting UE mobility in whole network, it is ensured that the seamless switching of user.
Fig. 4 is X2 interface chain of command protocol stack schematic diagram, and as shown in Figure 4, the Internet of X2 interface chain of command protocol stack uses IP agreement, the Stream Control Transmission Protocol that the transport layer on Internet uses.The X2-AP agreement of the application layer of the superiors, i.e. chain of command uses the signaling of the transmission carrying transmission X2-AP of bottom.Fig. 5 is X2 interface user face protocol stack schematic diagram, as it is shown in figure 5, X2 user face is formed transmission carrying by GTP-U/UDP/IP, is used for transmitting user face PDU (ProtocolDataUnit) between eNB and eNB.Transmission carrying is identified by TEID and the IP address of GTP-U, including: source GTP-UTEID, target side GTP-UTEID (TunnelEndpointIdentifier), source IP address and target side IP address, wherein, UDP port number is fixed as 2152, and GTP-U is that a tunnel protocol is for the seamless transit completing on IPv4 and IPv6.Each transmission carrying is for one operational data (ServiceDataFlows) of carrying.
Each eNB carries out the transmission of signaling and data by Uu interface (wave point being originally defined as between UTRAN and UE) and UE, Fig. 6 and Fig. 7 shows the air protocol stack between L1, L2, L3 of eNB and UE respectively from chain of command and user face.
Before introducing RN network element, lte-a system of the prior art has clear and definite protocol definition to X2 handoff procedure, Fig. 8 is the data forwarding schematic flow sheet introduced before RN network element in X2 switching, as shown in Figure 8, before switching, sub data transmission between the SGW of UE and UE is two parts: in ground side (non-air interface), SGW and source eNB (SourceeNB) transmit described UE data；Interface side aloft, is transmitted data by UE and source eNB.In handoff procedure, being sent to source eNB by SGW but be because switching the most not having enough time to be delivered successfully be forwarded target eNB (targeteNB) to the data of UE, this flow process is referred to as data forwarding (dataforwarding).After switching completes, the data transmission between the SGW of UE and UE is divided into two parts again: ground side (using non-air interface), SGW and target eNB transmit described UE data；Interface side (UE is to target eNB) aloft, is transmitted data by UE and target eNB.Owing to source eNB and target eNB use terrestrial interface, so propagation delay time is less, the requirement that service disconnection maximum is born can be met.
After Fig. 9 is for introducing RN network element, a kind of typical network architecture schematic diagram, in the figure, RN1 is a RN equipment, is linked on DeNB1, and another RN equipment RN2 is also coupled in DeNB1 simultaneously, and RN3 equipment is linked in DeNB2.Use new Un air interface to link between DeNB and RN, in this air interface, between DeNB and RN, there is X2 interface.DeNB1 and DeNB2 is use X2 interface.X2 bottom between DeNB1 and DeNB2 uses ground side agreement (non-air interface protocol).After UE is linked into RN equipment, other network elements, such as UE can be switched to and be linked into RN1, DeNB1, RN2, DeNB2 or RN3 can be switched to.
After introducing RN network element, in some public technologies, data forwarding is also had associated description, a typical application scenarios is selected to illustrate, Figure 10 is that in Fig. 9, certain UE under RN1 uses X2 interface to be switched to the data forwarding schematic flow sheet during RN3, as shown in Figure 10, before switching, the sub data transmission between the SGW of UE and UE is three parts: Part I, in ground side (non-air interface), is transmitted described UE data by SGW and source DeNB；Part II interface side aloft, is transmitted data by source RN (SourceRN) and source DeNB；Part III interface side aloft, is transmitted data by source RN and UE.In handoff procedure, being sent to source DeNB by SGW but be because switching the most not having enough time to be delivered successfully carry out forward process to the data demand of UE, this flow process is divided into three different steps in the illustrated case: passed through air interface by data forwarding to source DeNB by source RN；Terrestrial interface is passed through by data forwarding to target DeNB by source DeNB；Air interface is passed through by data forwarding to target RN (TargetRN) by target DeNB.After switching completes, the sub data transmission between the SGW of UE and UE is three parts: Part I, in ground side (non-air interface), is transmitted described UE data by SGW and target DeNB；Part II interface side aloft, is transmitted data by target RN and target DeNB；Part III interface side aloft, is transmitted data by target RN and UE.
According to foregoing description, owing to, in the case of source RN forwarding data to target RN, employing two air interfaces and terrestrial interface, so propagation delay time is relatively large.UE access target RN can carry out data transmission when, when the data of forward the most do not arrive target RN, UE and target RN need the described data such as always to arrive, the maximum latency that this time requires often beyond business itself, thus cause the data-transmission interruptions of described switching UE.
So, UE on RN network element is switched to other adjacent network elements, when such as other RN network elements under DeNB, DeNB, the RN under other DeNB, other DeNB, owing to S1/X2 ends in RN node, so, can there is long propagation delay time because using air interface transmission during carrying out data forwarding in downlink data, and this propagation delay time can further result in the interruption of UE business datum in handoff procedure, same problem is there is also based on similar reason, Home eNodeB (HNB) system and home evolved node B (HeNB) system.
Summary of the invention
In view of this, present invention is primarily targeted at a kind of data forwarding method based on wireless transmitting system of offer and system, it is possible to reduce the downlink data transmission brought because of air interface time delay and interrupt, it is ensured that the seriality of UE business transmission during switching.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
A kind of data forwarding method based on wireless transmitting system, including:
User terminal UE under the home evolved node B HeNB of Home eNodeB HNB/ source, via node RN/ source, source needs to switch over, HNB/ source, RN/ source, the most described source HeNB initiates corresponding handover request to its affiliated receiving base station DeNB/HNB gateway/HeNB gateway, and described handover request at least carries target network element information；
Described DeNB/HNB gateway/HeNB gateway judges that described UE needs to cut out from HNB/ source, RN/ source, described source HeNB, and target network element is agreed to receive described handover request, then the downlink user face data of described UE are transmitted to described target network element.
Described target network element is: the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, other RN/HNB/HeNB under DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, the DeNB/HNB gateway/HeNB gateway different from the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, RN/HNB/HeNB DeNB/HNB gateway/HeNB gateway under different from the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source.
Described DeNB/HNB gateway/HeNB gateway judge described UE need from RN/ source, source HNB/ source HeNB cut out as: DeNB/HNB gateway/HeNB gateway judges according to the handover request from RN/ source, source HNB/ source HeNB.
HNB/ source, RN/ source, described source HeNB, after its affiliated DeNB/HNB gateway/HeNB gateway initiates handover request, further comprises the steps of:
Described handover request is transmitted to target network element by described DeNB/HNB gateway/HeNB gateway；
Described target network element agrees to receive described handover request, then return Handover Request Acknowledge to described DeNB/HNB gateway/HeNB gateway,
Described DeNB/HNB gateway/HeNB gateway judge described UE need from RN/ source, source HNB/ source HeNB cut out as: DeNB/HNB gateway/HeNB gateway judges according to the Handover Request Acknowledge from target network element.
Described DeNB/HNB gateway/HeNB gateway judge target network element agree to receive described handover request as: described DeNB/HNB gateway/HeNB gateway receives the Handover Request Acknowledge from target network element,
The downlink user face data of described UE are transmitted to described target network element by described DeNB/HNB gateway/HeNB gateway: described DeNB/HNB gateway/HeNB gateway receives after the Handover Request Acknowledge of target network element, forward the downlink user face data of described UE to target network element.
The method further comprise the steps of: DeNB/HNB gateway/HeNB gateway to target network element forward described UE the downlink user face data setting time after, to RN/ source, source HNB/ source HeNB forward described Handover Request Acknowledge.
The data of DeNB/HNB gateway/between HeNB gateway and target network element forward and use X2 interface user face.
Described DeNB/HNB gateway/HeNB gateway receives after the Handover Request Acknowledge of target network element, create the descending backup buffers of described UE, and before the downlink user face data of described UE are transmitted to described target network element by described DeNB/HNB gateway/HeNB gateway, the downlink user face data of described UE are backed up.
A kind of data forwarding system based on wireless transmitting system, including: UE, HNB/ source, RN/ source, source HeNB, DeNB/HNB gateway/HeNB gateway and target network element,
HNB/ source, RN/ source, described source HeNB, when the UE under it needs to switch over, initiates corresponding handover request to its affiliated receiving base station DeNB/HNB gateway/HeNB gateway, and described handover request at least carries target network element information；
The downlink user face data of described UE for judging that UE needs to cut out from HNB/ source, RN/ source, described source HeNB, and when target network element agrees to receive described handover request, are transmitted to target network element by described DeNB/HNB gateway/HeNB gateway；
Described target network element, is used for receiving the downlink user face data of the UE of DeNB/HNB gateway/HeNB gateway forwards.
Described DeNB/HNB gateway/HeNB gateway judge described UE need from RN/ source, source HNB/ source HeNB cut out as: DeNB/HNB gateway/HeNB gateway judges according to the handover request from RN/ source, source HNB/ source HeNB.
Described DeNB/HNB gateway/HeNB gateway, is additionally operable to handover request is transmitted to target network element；
Described target network element, is additionally operable to, when agreeing to receive described handover request, return Handover Request Acknowledge to DeNB/HNB gateway/HeNB gateway,
Described DeNB/HNB gateway/HeNB gateway judge described UE need from RN/ source, source HNB/ source HeNB cut out as: DeNB/HNB gateway/HeNB gateway judges according to the Handover Request Acknowledge from target network element.
Described DeNB/HNB gateway/HeNB gateway judge target network element agree to receive described handover request as: described DeNB/HNB gateway/HeNB gateway receives the Handover Request Acknowledge from target network element,
The downlink user face data of described UE are transmitted to described target network element by described DeNB/HNB gateway/HeNB gateway: described DeNB/HNB gateway/HeNB gateway receives after the Handover Request Acknowledge of target network element, forward the downlink user face data of described UE to target network element.
Described DeNB/HNB gateway/HeNB gateway, is additionally operable to, after the downlink user face data setting time forwarding described UE to target network element, forward Handover Request Acknowledge to RN/ source, source HNB/ source HeNB.
Described DeNB/HNB gateway/HeNB gateway, is additionally operable to receiving after the Handover Request Acknowledge of target network element, creates the descending backup buffers of described UE；And before the downlink user face data of UE are transmitted to described target network element, the downlink user face data of described UE are backed up.
Present invention data forwarding method based on wireless transmitting system and system, in the case of not changing existing air interface transmission mechanism, data are directly forwarded by DeNB/HNB gateway/HeNB gateway, interrupt it is thus possible to reduce the downlink data transmission brought because of air interface time delay, it is ensured that the seriality of UE business transmission during switching.
Accompanying drawing explanation
Fig. 1 is the structural representation of cellular radio communication system in prior art；
Fig. 2 is Relay schematic network structure；
Fig. 3 is LTE network configuration diagram；
Fig. 4 is X2 interface chain of command protocol stack schematic diagram；
Fig. 5 is X2 interface user face protocol stack schematic diagram；
Fig. 6 is the air protocol stack between L1, L2, L3 of eNB and UE shown from chain of command；
Fig. 7 is the air protocol stack between L1, L2, L3 of eNB and UE shown from user face；
Fig. 8 is the data forwarding schematic flow sheet introduced before RN network element in X2 switching；
After Fig. 9 is for introducing RN network element, a kind of typical network architecture schematic diagram；
Figure 10 is that in Fig. 9, certain UE under RN1 uses X2 interface to be switched to the data forwarding schematic flow sheet during RN3；
Figure 11 is present invention data forwarding method based on wireless transmitting system schematic flow sheet；
Figure 12 is the data forwarding detailed process schematic diagram used after the present invention in UE switching；
Figure 13 is the embodiment of the present invention 1 data forwarding method based on wireless transmitting system schematic flow sheet；
Figure 14 is the embodiment of the present invention 2 data forwarding method based on wireless transmitting system schematic flow sheet；
Figure 15 is the embodiment of the present invention 3 data forwarding method based on wireless transmitting system schematic flow sheet；
Figure 16 is the embodiment of the present invention 4 data forwarding method based on wireless transmitting system schematic flow sheet.
Detailed description of the invention
The basic thought of the present invention is: in the case of not changing existing air interface transmission mechanism, directly forwards data by DeNB/HNB gateway/HeNB gateway.
Figure 11 is present invention data forwarding method based on wireless transmitting system schematic flow sheet, and as shown in figure 11, present invention data forwarding based on wireless transmitting system includes:
Step 1101: the UE under the HNB/ source HeNB of RN/ source, source needs to switch over.
Now, the downlink user face data of UE arrive RN/HNB/HeNB via DeNB/HNB gateway/HeNB gateway and are handed down to described UE again.In the present invention, RN/ source, source HNB/ source HeNB refers to the RN/HNB/HeNB network element that UE cuts out.
Step 1102: RN/ source, source HNB/ source HeNB initiates corresponding handover request to its affiliated receiving base station DeNB/HNB gateway/HeNB gateway.
Here, handover request at least carries target network element information, it should be noted that target network element described here is generally: the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, other RN/HNB/HeNB under DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, the DeNB/HNB gateway/HeNB gateway different from the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, RN/HNB/HeNB DeNB/HNB gateway/HeNB gateway under different from the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source.
Step 1103: described handover request is transmitted to target network element by described DeNB/HNB gateway/HeNB gateway.
Step 1104: target network element agrees to receive described handover request, then return Handover Request Acknowledge to described DeNB/HNB gateway/HeNB gateway.
Here, Handover Request Acknowledge typically can comprise: ULGTPTunnelEndpoint field and/or DLGTPTunnelEndpoint field.
In the case of step 1105:DeNB/HNB gateway/HeNB gateway judges that UE needs to cut out from HNB/ source, RN/ source, described source HeNB, and target network element is agreed to receive described handover request, the downlink user face data of UE are transmitted to target network element.
It should be noted that the target network element that UE switches is other DeNB/HNB gateway/HeNB gateways, then the DeNB/HNB gateway/HeNB gateway belonging to the HeNB of HNB/ source, source RN/ source forwards the data to described target DeNB/ target HNB gateway/target HeNB gateway；If the target network element of UE switching is the RN/HNB/HeNB under other DeNB/HNB gateway/HeNB gateways, then the DeNB/HNB gateway/HeNB gateway belonging to the HeNB of HNB/ source, source RN/ source forwards the data to other DeNB/HNB gateway/HeNB gateways described, then by other DeNB/HNB gateways/HeNB gateway forwards downlink data to target RN/HNB/HeNB.
It should be noted that, DeNB/HNB gateway/HeNB gateway can judge that UE needs to cut out from HNB/ source, RN/ source, described source HeNB in several ways, such as, can carry out judging (such as judging before step 1103) according to the handover request from RN/ source, source HNB/ source HeNB, can also judge according to the Handover Request Acknowledge from target network element, it is also possible to judge from transmission or the RX path of message.
It should be noted that data forward the interface used preferably to use X2 interface user face.
Here, it is determined that target network element is agreed to receive described handover request i.e. DeNB/HNB gateway/HeNB gateway to receive the Handover Request Acknowledge from target network element.
DeNB/HNB gateway/HeNB gateway receives after the Handover Request Acknowledge of target network element; the downlink user face number of described UE directly can be forwarded to target network element; after the descending backup buffers of described UE can also be created; the downlink user face data of described UE are forwarded again to target network element; in view of the protection after handoff failure, DeNB/HNB gateway/HeNB gateway also includes before the downlink user face data of UE are transmitted to described target network element: back up the downlink user face data of described UE.
Step 1106:DeNB/HNB gateway/HeNB gateway, after target network element forwards the downlink user face data setting time of UE, forwards Handover Request Acknowledge to RN/ source, source HNB/ source HeNB.
Data forwarding detailed process during UE switches after using the present invention is as shown in figure 12, can be seen that, the present invention is not in the case of changing existing air interface transmission mechanism, data are directly forwarded by DeNB/HNB gateway/HeNB gateway, interrupt it is thus possible to reduce the downlink data transmission brought because of air interface time delay, it is ensured that the seriality of UE business transmission during switching.
The present invention also proposes a kind of data forwarding system based on wireless transmitting system, including: UE, HNB/ source, RN/ source, source HeNB, DeNB/HNB gateway/HeNB gateway and target network element, wherein,
RN/ source, source HNB/ source HeNB, when the UE under it needs to switch over, initiates corresponding handover request to its affiliated receiving base station DeNB/HNB gateway/HeNB gateway, and described handover request at least carries target network element information；
The downlink user face data of described UE for judging that UE needs to cut out from HNB/ source, RN/ source, described source HeNB, and when target network element agrees to receive described handover request, are transmitted to target network element by DeNB/HNB gateway/HeNB gateway；
Target network element, is used for receiving the downlink user face data of the UE of DeNB/HNB gateway/HeNB gateway forwards.
DeNB/HNB gateway/HeNB gateway judge described UE need from RN/ source, source HNB/ source HeNB cut out as: DeNB/HNB gateway/HeNB gateway judges according to the handover request from RN/ source, source HNB/ source HeNB.
DeNB/HNB gateway/HeNB gateway, is additionally operable to handover request is transmitted to target network element；
Target network element, is additionally operable to, when agreeing to receive described handover request, return Handover Request Acknowledge to DeNB/HNB gateway/HeNB gateway,
DeNB/HNB gateway/HeNB gateway judge described UE need from RN/ source, source HNB/ source HeNB cut out as: DeNB/HNB gateway/HeNB gateway judges according to the Handover Request Acknowledge from target network element.
DeNB/HNB gateway/HeNB gateway judge target network element agree to receive described handover request as: described DeNB/HNB gateway/HeNB gateway receives the Handover Request Acknowledge from target network element,
The downlink user face data of described UE are transmitted to described target network element by DeNB/HNB gateway/HeNB gateway: described DeNB/HNB gateway/HeNB gateway receives after the Handover Request Acknowledge of target network element, forward the downlink user face data of described UE to target network element.
DeNB/HNB gateway/HeNB gateway, is additionally operable to, after the downlink user face data setting time forwarding described UE to target network element, forward Handover Request Acknowledge to RN/ source, source HNB/ source HeNB.
DeNB/HNB gateway/HeNB gateway, is additionally operable to receiving after the Handover Request Acknowledge of target network element, creates the descending backup buffers of described UE；And before the downlink user face data of UE are transmitted to described target network element, the downlink user face data of described UE are backed up.
Enforcement to technical scheme is described in further detail below in conjunction with the accompanying drawings.
Embodiment 1
In the present embodiment, UE is switched to the DeNB belonging to described RN from its affiliated RN, as a example by Fig. 9, UE is switched to DeNB1 by RN1, Figure 13 is the embodiment of the present invention 1 data forwarding method based on wireless transmitting system schematic flow sheet, as shown in figure 13, the embodiment of the present invention 1 data forwarding method based on wireless transmitting system includes:
Step 1301:RN1 judges have UE to cut out, and switching target is DeNB1, then RN1 sends X2-Ap handover request (handoverrequest) message to DeNB1.
Here, this X2-Ap handover request message can carry cause field as follows:
| IE/Group Name | Pr esence | Range | IE Type and Reference | Semantics Description |
| CHOICE Cause Group | M | |||
| ＞ Radio Network Layer | ||||
| ＞ ＞ Radio NetworkLayer Cause | M | ENUME RATED ( RN handover to DeNB... ) |
After step 1302:DeNB1 receives described X2-Ap handover request message, it is judged that find that UE needs the target network element of switching to be this DeNB, i.e. DeNB1.DeNB1 now judges that this switching is to be switched to DeNB1 by RN1, and the RN1 cut out is under this DeNB, and this situation for this UE keeps a record.
Step 1303:DeNB1 is agreed to receive described X2-Ap handover request, then create the downlink data relief area of described UE.
Step 1304:DeNB1 sends X2-AP Handover Request Acknowledge (handoverrequestacknowledge) message to RN1, and the downlink user face data of this UE are forwarded directly to the downlink data relief area that creates for described UE by DeNB1.
Downlink data is descended to buffer i.e. at this network element under the circumstances, the unspecial Backup Data of DeNB1.The data being saved in downlink data relief area are no longer sent to RN1 by DeNB.Additionally, it is contemplated that UE is switching when, RN1 there is also the downlink data not having enough time to issue, DeNB1 should send handoverrequestacknowledge message after sending DeNB1 Backup Data.
Step 1305:UE successful switch is to after DeNB1, and DeNB1 is when transmitting downlink data, and the data read in downlink data relief area carry out downlink data transmission.
Embodiment 2
In the present embodiment, UE from its current belonging to source RN be switched to belong to another RN of same DeNB with described source RN, as a example by Fig. 9, UE is switched to RN2 by RN1, Figure 14 is the embodiment of the present invention 2 data forwarding method based on wireless transmitting system schematic flow sheet, as shown in figure 14, the embodiment of the present invention 2 data forwarding method based on wireless transmitting system includes:
Step 1401:RN1 judges have UE to cut out, and switching target is RN2, then RN1 transmission X2-Aphandoverrequest message is to DeNB1, and the community that in message, target CellID is corresponding is the community belonging to RN2.
After step 1402:DeNB1 receives described X2-Aphandoverrequest message, it is judged that the target finding this message is another RN under this DeNB, i.e. RN2, simultaneously, DeNB1 judges that this switching is to be switched to RN2 from RN1, and RN1 is just under this DeNB, and this situation for this UE keeps a record.Afterwards, DeNB1 by X2-Aphandoverrequest message be sent to RN2.
Step 1403:RN2 is after receiving described X2-Aphandoverrequest message, if agreeing to receive described handover request, then create the downlink data relief area of described UE, and set up the X2 user face port accepting downlink data forwarding, afterwards, X2-APhandoverrequestacknowledge message is sent to DeNB1 by RN2.
After step 1404:DeNB1 receives the X2-APhandoverrequestacknowledge message that RN2 sends, identifying this is the return message being switched to RN2 about UE from RN1, then DeNB1 creates descending backup buffers, and directly by the X2 user face of DeNB1 and RN2, UE downlink user face data are transmitted to RN2, afterwards, X2-APhandoverrequestacknowledge is sent to RN1 by DeNB1.
In view of the protection after handoff failure, these UE downlink user face data can be backed up by DeNB1 simultaneously.RN2 is saved in after receiving data in the UE downstream buffer data field of RN2.The data that these back up are not sent simultaneously to RN1 by DeNB1.Additionally, it is contemplated that UE is switching when, RN1 there is also the downlink data not having enough time to issue, DeNB1 just forwards X2-APhandoverrequestacknowledge message to RN1 after forwarding data to RN2.
Step 1405:UE successful switch is to after RN2, and RN2, when transmitting downlink data, carries out downlink data transmission by reading downlink data relief area.
Embodiment 3
In the present embodiment, UE is switched to and the DeNB different for DeNB belonging to the RN of source from source RN, as a example by Fig. 9, UE is switched to DeNB2 by RN1, Figure 15 is the embodiment of the present invention 3 data forwarding method based on wireless transmitting system schematic flow sheet, as shown in figure 15, the embodiment of the present invention 3 data forwarding method based on wireless transmitting system includes:
Step 1501:RN1 judge have UE to cut out, switching target be DeNB2, RN1 transmission X2-Aphandoverrequest message to DeNB1, the community that in message, target CellID is corresponding is the community belonging to DeNB2.
After step 1502:DeNB1 receives described message, it is judged that the target finding this message is other DeNB, i.e. DeNB2.DeNB1 now judges that this switching is to be switched to DeNB2 from RN1, and RN1 is under DeNB1, and DeNB1 is that this situation of this UE keeps a record after identifying this situation, and afterwards, X2-Aphandoverrequest message is sent to DeNB2 by DeNB1.
Step 1503:DeNB2 is after receiving X2-Aphandoverrequest message, if agreeing to receive described handover request, then create the downlink data relief area of described UE, and setting up the X2 user face port accepting downlink data forwarding, DeNB2 sends X2-APhandoverrequestacknowledge message to DeNB1 afterwards.
After step 1504:DeNB1 receives the X2-APhandoverrequestacknowledge message that DeNB2 sends, identify this be UE be the return message being switched to DeNB2 from RN1, then DeNB1 creates descending backup buffers, and directly forward the downlink user face data of UE to DeNB2 by the X2 user face of DeNB1 and DeNB2, afterwards, DeNB1 forwards X2-APhandoverrequestacknowledge message to RN1.
In view of the protection after handoff failure, DeNB1 is simultaneously by this UE downlink user face data backup.DeNB2 is saved in after receiving data in the downstream buffer data field of the UE described in DeNB2, and the data that these back up are not sent simultaneously to RN1 by DeNB1.Additionally, it is contemplated that UE is switching when, RN1 there is also the downlink data not having enough time to issue, DeNB1 forwards X2-APhandoverrequestacknowledge message to RN1 after forwarding data to DeNB2.
Step 1505:UE successful switch is to after DeNB2, and DeNB2, when transmitting downlink data, reads downlink data relief area and carries out downlink data transmission.
Embodiment 4
In the present embodiment, UE is switched to and the RN the DeNB different for DeNB belonging to the RN of source from source RN, as a example by Fig. 9, UE is switched to RN3 by RN1, Figure 16 is the embodiment of the present invention 4 data forwarding method based on wireless transmitting system schematic flow sheet, as shown in figure 16, the embodiment of the present invention 4 data forwarding method based on wireless transmitting system includes:
Step 1601:RN1 judges have UE to cut out, and switching target is RN3, then RN1 transmission X2-Aphandoverrequest message is to DeNB1, and the community that in message, target CellID is corresponding is the community belonging to RN3.
After step 1602:DeNB1 receives X2-Aphandoverrequest message, it is judged that the target finding this message is the RN under another DeNB, and in the present embodiment, another DeNB is DeNB2, and described target RN is RN3.DeNB1 now judges that this switching is to be switched to RN3 from RN1, and RN1 is under this DeNB, and DeNB1 is that this situation of this UE keeps a record after identifying this situation, and afterwards, X2-Aphandoverrequest message is sent to DeNB2 by DeNB1.
After step 1603:DeNB2 receives X2-Aphandoverrequest message, it is judged that the target finding this message is the RN3 under this DeNB.DeNB2 the most accordingly judges that this switching is to be switched to RN3 from RN1, and RN1 is not under this DeNB, and DeNB2 is that this situation of this UE keeps a record after identifying this situation, and afterwards, X2-Aphandoverrequest message is sent to RN3 by DeNB2.
After step 1604:RN3 receives X2-Aphandoverrequest message, if agreeing to receive described handover request, then create the downlink data relief area of described UE, and set up the X2 user face port accepting downlink data forwarding, afterwards, X2-APhandoverrequestacknowledge message is sent to DeNB2 by RN3.
After step 1605:DeNB2 receives the X2-APhandoverrequestacknowledge message that RN3 sends, identifying this is that UE is switched to the return message of RN3 from RN1.Then DeNB2 creates the X2 user face port that downlink data forwards, and X2-APhandoverrequestacknowledge message is sent to DeNB1.
After step 1606:DeNB1 receives the X2-APhandoverrequestacknowledge message that DeNB2 sends, identifying this is that UE is switched to the return message of RN3 from RN1, then DeNB1 creates descending backup buffers, and directly by the X2 user face of DeNB1 and DeNB2, the downlink user face data of UE are transmitted to DeNB2, afterwards, X2-APhandoverrequestacknowledge is sent to RN1 by DeNB1.
In view of the protection after handoff failure, this UE downlink data is backed up by DeNB1 simultaneously.After DeNB2 receives data, it is transmitted to RN3 by the X2 user face of DeNB2 and RN3, after RN3 receives receipt, saves it in the downstream buffer data field of described UE.The data that these back up are not sent simultaneously to RN1 by DeNB1.Additionally, it is contemplated that UE is switching when, RN1 there is also the downlink data not having enough time to issue, DeNB1 just forwards X2-APhandoverrequestacknowledge message to RN1 after forwarding data to RN3.
Step 1607:UE successful switch is to after RN3, and RN3, when transmitting downlink data, reads downlink data relief area and carries out downlink data transmission.
The above, only presently preferred embodiments of the present invention, it is not intended to limit protection scope of the present invention.
Claims (11)
1. a data forwarding method based on wireless transmitting system, it is characterised in that the method includes:
User terminal UE under the home evolved node B HeNB of Home eNodeB HNB/ source, via node RN/ source, source needs to switch over, HNB/ source, RN/ source, the most described source HeNB initiates corresponding handover request to its affiliated receiving base station DeNB/HNB gateway/HeNB gateway, and described handover request at least carries target network element information；
Described DeNB/HNB gateway/HeNB gateway judges that described UE needs to cut out from HNB/ source, RN/ source, described source HeNB, and the target network element agreement described handover request of receiving, after then starting the downlink user face data of described UE are transmitted to described target network element, then send Handover Request Acknowledge to HNB/ source, RN/ source, described source HeNB；Described DeNB/HNB gateway/HeNB gateway judge described UE need from RN/ source, source HNB/ source HeNB cut out as: DeNB/HNB gateway/HeNB gateway judges according to the handover request from RN/ source, source HNB/ source HeNB；
Described target network element is: the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, other RN/HNB/HeNB under DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, the DeNB/HNB gateway/HeNB gateway different from the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, RN/HNB/HeNB DeNB/HNB gateway/HeNB gateway under different from the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source.
Method the most according to claim 1, it is characterised in that HNB/ source, RN/ source, described source HeNB, after its affiliated DeNB/HNB gateway/HeNB gateway initiates handover request, further comprises the steps of:
Described handover request is transmitted to target network element by described DeNB/HNB gateway/HeNB gateway；
Described target network element agrees to receive described handover request, then return Handover Request Acknowledge to described DeNB/HNB gateway/HeNB gateway.
Method the most according to claim 2, it is characterised in that
Described DeNB/HNB gateway/HeNB gateway judge target network element agree to receive described handover request as: described DeNB/HNB gateway/HeNB gateway receives the Handover Request Acknowledge from target network element,
The downlink user face data of described UE are transmitted to described target network element by described DeNB/HNB gateway/HeNB gateway: described DeNB/HNB gateway/HeNB gateway receives after the Handover Request Acknowledge of target network element, forward the downlink user face data of described UE to target network element.
Method the most according to claim 3, it is characterized in that, the method further comprise the steps of: DeNB/HNB gateway/HeNB gateway to target network element forward described UE the downlink user face data setting time after, to RN/ source, source HNB/ source HeNB forward described Handover Request Acknowledge.
Method the most according to claim 1, it is characterised in that the data of DeNB/HNB gateway/between HeNB gateway and target network element forward and use X2 interface user face.
Method the most according to claim 3, it is characterized in that, described DeNB/HNB gateway/HeNB gateway receives after the Handover Request Acknowledge of target network element, create the descending backup buffers of described UE, and before the downlink user face data of described UE are transmitted to described target network element by described DeNB/HNB gateway/HeNB gateway, the downlink user face data of described UE are backed up.
7. a data forwarding system based on wireless transmitting system, it is characterized in that, this system includes: user terminal UE, Home eNodeB HNB/ source, via node RN/ source, source home evolved node B HeNB, receiving base station DeNB/HNB gateway/HeNB gateway and target network element, it is characterised in that
HNB/ source, RN/ source, described source HeNB, when the UE under it needs to switch over, initiates corresponding handover request to its affiliated DeNB/HNB gateway/HeNB gateway, and described handover request at least carries target network element information；
Described DeNB/HNB gateway/HeNB gateway, for judging that UE needs to cut out from HNB/ source, RN/ source, described source HeNB, and during the target network element agreement described handover request of receiving, after starting the downlink user face data of described UE are transmitted to target network element, then send Handover Request Acknowledge to HNB/ source, RN/ source, described source HeNB；Described DeNB/HNB gateway/HeNB gateway judge described UE need from RN/ source, source HNB/ source HeNB cut out as: DeNB/HNB gateway/HeNB gateway judges according to the handover request from RN/ source, source HNB/ source HeNB；
Described target network element, is used for receiving the downlink user face data of the UE of DeNB/HNB gateway/HeNB gateway forwards.
System the most according to claim 7, it is characterised in that
Described DeNB/HNB gateway/HeNB gateway, is additionally operable to handover request is transmitted to target network element；
Described target network element, is additionally operable to, when agreeing to receive described handover request, return Handover Request Acknowledge to DeNB/HNB gateway/HeNB gateway；
Described target network element is: the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, other RN/HNB/HeNB under DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, the DeNB/HNB gateway/HeNB gateway different from the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source；Or, RN/HNB/HeNB DeNB/HNB gateway/HeNB gateway under different from the DeNB/HNB gateway/HeNB gateway belonging to the HNB/ source HeNB of RN/ source, source.
System the most according to claim 8, it is characterised in that described DeNB/HNB gateway/HeNB gateway judge target network element agree to receive described handover request as: described DeNB/HNB gateway/HeNB gateway receives the Handover Request Acknowledge from target network element,
The downlink user face data of described UE are transmitted to described target network element by described DeNB/HNB gateway/HeNB gateway: described DeNB/HNB gateway/HeNB gateway receives after the Handover Request Acknowledge of target network element, forward the downlink user face data of described UE to target network element.
System the most according to claim 9, it is characterised in that
Described DeNB/HNB gateway/HeNB gateway, is additionally operable to, after the downlink user face data setting time forwarding described UE to target network element, forward Handover Request Acknowledge to RN/ source, source HNB/ source HeNB.
11. systems according to claim 9, it is characterised in that
Described DeNB/HNB gateway/HeNB gateway, is additionally operable to receiving after the Handover Request Acknowledge of target network element, creates the descending backup buffers of described UE；And before the downlink user face data of UE are transmitted to described target network element, the downlink user face data of described UE are backed up.
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| CN108811004B (en) * | 2017-04-28 | 2020-07-17 | 捷开通讯(深圳)有限公司 | Auxiliary base station switching method and device |
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| 《Report of email discussion [66#22] on Relay architecture,R2-093972》;NTT DOCOMO;《3GPP TSG-RAN WG2 #66bis》;20090703;全文 * |
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