CN101998449B

CN101998449B - Transmission system and method applied to wireless relay

Info

Publication number: CN101998449B
Application number: CN200910163464.3A
Authority: CN
Inventors: 奚进; 黄亚达
Original assignee: ZTE Corp
Current assignee: Shenzhen Fu Hai Sunshine Technology Co., Ltd.
Priority date: 2009-08-17
Filing date: 2009-08-17
Publication date: 2015-07-22
Anticipated expiration: 2029-08-17
Also published as: CN101998449A; WO2011020413A1

Abstract

The invention discloses a transmission system applied to a wireless relay. The system comprises at least two transmission network access nodes which are connected with a relay, wherein the relay is simultaneously accessed into a transmission network by a transmission network access node positioned on a core network and a transmission network access node positioned on a Donor NB (DNB) and transmitting relay data on transmission channels which are respectively established among different transmission network access nodes. The invention also discloses a transmission method applied to a wireless relay. The method comprises the following step: the relay is simultaneously accessed into the transmission network by the transmission network access node positioned on the core network and the transmission network access node positioned on the DNB. By adopting the system and the method of the invention, the relay can be simultaneously accessed into the transmission network by two transmission passages, thereby solving the problem of relay data transmission comprising scene switching.

Description

A kind of transmission system and transmission method being applied to wireless relay

Technical field

The present invention relates to the wireless relay field in cellular radio communication system, particularly relate to a kind of transmission system and the transmission method that are applied to wireless relaying technique.

Background technology

Cellular radio communication system is primarily of terminal (UE, User Equipment), wireless access network and core net composition, and as shown in Figure 1, Fig. 1 comprises base station, terminal and core net.Wherein, the network be made up of base station or the network be jointly made up of base station and base station controller are all called wireless access network, and wireless access network is responsible for Access Layer affairs, the management of such as Radio Resource.Physics or connection in logic can be there is according to actual conditions, as the base station 1 in Fig. 1 and base station 2 or base station 3 between base station.Each base station can be connected with one or more than one core net node.Core net is responsible for Non-Access Stratum affairs, such as location updating etc., and is the anchor point in user face.UE refers to and can carry out the various equipment of network communication, such as mobile phone or notebook computer etc. with cellular radio communication.

In cellular radio communication system, the wireless coverage of fixed base stations network is restricted due to various reason, and such as various building structure is to reasons such as the stops of wireless signal, causes inevasible existence in the covering of wireless network to cover leak.In addition, in the border district of community, due to weakening of wireless signal strength, and the interference of neighbor cell, cause UE when cell edge, communication quality is poor, and the error rate of wireless transmission is raised.In order to improve data transmission throughput, group mobility, casual network is disposed, the throughput in cell edge area and the covering of new region, there is a solution to be introduce a kind of wireless network node at cellular radio communication system, be called via node (Relay).

Relay has the website by wireless link relay data and possibility control information function between other network nodes, is also via node/relay station.The operation principle of Relay as shown in Figure 2.Wherein, the UE that the UE that base station is directly served makes grand UE, Relay serve is relaying UE.Interface link between each network element comprises: the link that direct transfers, access link and back haul link, and wherein, the link that direct transfers is the wireless link between base station and UE, comprises the link that direct transfers of uplink and downlink; Access link is the link between Relay and UE, comprises the access link of uplink and downlink; Back haul link is the wireless link between base station and Relay, comprises the back haul link of uplink and downlink.

Relay can by multiple method relay data, such as directly amplify the base station received and send wireless signal, or is carried out corresponding process after the data receiver that base station is sent, can be demodulation or decoding after, be transmitted to UE again, or base station and relaying cooperation send data to UE, contrary Relay also can the data that send to base station from UE of relaying.

In numerous trunk types, have a kind of relaying, its feature is as follows:

UE cannot distinguish the community under Relay and fixed base stations, and namely as broad as long with the community under base station from the community under UE, Relay, this type of community can be called Relay community.The Relay community physical cell identity (PCI that have oneself the same as all communities, physical cell identity), equally with normal cells send broadcast, when UE resides in relaying cell, relaying cell can use to UE by allocation schedule Radio Resource separately, separate with the wireless resource scheduling of the base station participating in relaying.Interface between Relay community and RelayUE and protocol stack identical with between ordinary base station community and UE.Wherein, the base station of relaying is otherwise known as Donor base station, i.e. the base station that connected by back haul link of Relay.

Below, based on Long Term Evolution (LTE, Long Term Evolution) cellular radio communication system, the interface specification of above-mentioned Relay community back haul link is described.LTE system adopts internet protocol-based (IP, Internet Protocol) flat architecture, as shown in Figure 3, by the Universal Terrestrial Radio Access Network (E-UTRAN of evolution, Evolved Universal Terrestrial Radio Access Network), the node of evolved data core net (EPC, Evolved Packet Core) composition.Wherein, the node of EPC comprises: mobile management unit (MME, Mobility Management Entity), gateway (S-GW, ServingGateway), packet data network gateway (P-GW, PDN Gateway).MME is responsible for chain of command signaling, comprises the chain of command related works such as mobile management, the process of Non-Access Stratum signaling, the contextual management of mobile management of user; S-GW is responsible for transmission, the forwarding and route handoff etc. of UE user face data; P-GW connects EPC and bag data network as the node of the Internet, is responsible for being filtered into business data flow (Service Data Flows) as the distribution of UE IP address, IP packet by type of service and being tied to the transmission bearer etc. of correspondence.

The node of E-UTRAN comprises eNB, is logically connected to each other by X2 interface between eNB, for supporting the mobility of UE in whole network, ensures the seamless switching of user.Each eNB is by S1 interface, be connected to System Architecture Evolution (SAE, System Architecture Evolution) core net, namely be connected with MME by control plane S1-MME interface, be connected with S-GW by user plane S1-U interface, S1 interface supports the Mulit-point Connection between eNB and MME and S-GW.Be connected by S11 interface between MME and S-GW, be connected between S-GW and P-GW by S5 interface, also can be merged into a network element, now S5 interface does not exist.Each eNB by Uu interface, is defined as the transmission that wave point between UTRAN and UE and UE carry out signaling and data at first.After introducing Relay, the wave point between Relay and eNB is Un interface, and the interface between Relay and UE and between eNB and UE is identical, so be also Uu interface.

In the node architecture of current existing relay system, Relay data are entered to the node of transmission network, a kind of framework is: be defined on core network element by the access node of transmission network, the P-GW of such as Relay; Another kind of framework is: be defined in by the access node of transmission network in host base station (DeNB, DonoreNB), and the local access network of such as DeNB closes (LBO GW, Local Break Out GW).But in the transmission efficiency of data, all there is limitation when especially considering different mobility demand, specifically set forth below in these two kinds of frameworks.

On the one hand, access node is positioned to the framework of core network element, the data transmitted due to all Relay are all encapsulated in Realy in this transmission channel of core network element, when certain UE of Relay administration switches, hand off signaling will be routed to access network elements after arriving core network element by Relay again, oppositely still.And the data inverse-transmitting path in switching will return core network element from same paths after arriving Relay by core network element again, access network element then just can be routed to; On the other hand, access node is positioned to the framework of the LBO transmission channel of DeNB, because this transmission channel is based upon as it provides on the host base station of wireless access, so when Relay itself switches, need to set up new transmission channel at target DeNB, and the transmission channel being nested in many UE in this passage needs to be switched to newly-built transmission channel respectively, switching flow is complicated.Visible, Relay can only access a single transmission channel, and due in above-mentioned two transmission channels, every bar transmission channel all exists respective limitation, the transmission of the Relay data under scene such as is unfavorable for such as switching.Therefore, at present, be linked into the transmission plan of core net and DeNB by above-mentioned two transmission channels in the urgent need to a kind of Relay, to solve the problem of the Relay transfer of data comprising handoff scenario simultaneously.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of transmission system and the transmission method that are applied to wireless relay, make Relay can be linked into transmission network by above-mentioned two transmission channels simultaneously, thus solve the problem of the Relay transfer of data comprising handoff scenario.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of transmission system being applied to wireless relay, this system comprises: one group of via node (Relay) and one group of evolved base station (eNB), described eNB is as the host base station (DeNB) of described RELAY, and this system also comprises: at least two the transmission network access nodes be connected with described Relay;

Wherein, described Relay, for by the transmission network access node be positioned in core net and the transmission network access node be positioned on DeNB, access transmission network simultaneously, and the transmission channel set up respectively between different transmission network access node transmits Relay data.

Wherein, every bar transmission channel has transport address, and transport address specifically comprises: be responsible for the address distributed by the transmission network access node corresponding with current transmission channel.

Wherein, the mode of setting up of transmission channel specifically comprises: set up the mode that packet data network (PDN) is connected between described Relay with described transmission network access node.

Wherein, described transmission network access node specifically comprises: packet data network gateway (P-GW), and P-GW is optionally positioned in core net or on DeNB;

Described transmission channel specifically comprises: inner at DeNB, and the general packet wireless service tunnel protocol of the user level set up between DeNB and P-GW (GTPU) tunnel.

Wherein, described Relay data specifically comprise: the user face data of Relay self; Described Relay data also comprise: the chain of command dedicated signaling of the UE that common control channel makes or Relay administers of the wireless access network element that Relay provides and user face data.

A kind of transmission method being applied to wireless relay, the method comprises: Relay is by the transmission network access node be positioned in core net and the transmission network access node be positioned on DeNB, access transmission network simultaneously, and the transmission channel set up respectively between different transmission network access node transmits Relay data.

Wherein, different transmission channels has different transport addresses;

The method comprises further: the transmission network access node corresponding with current transmission channel, is responsible for distributing transport address to current transmission channel.

Wherein, described Relay, sets up described transmission channel and specifically comprises between different transmission network access node:

Between described Relay and described transmission network access node, set up described transmission channel respectively by the mode setting up PDN connection, and enter transmission network.

Wherein, described transmission network access node specifically comprises: P-GW; Described transmission channel specifically comprises: GTPU tunnel;

Between described Relay and the P-GW in core net and the P-GW on DeNB, set up described PDN respectively and connect; And inner at DeNB, and between DeNB to the P-GW in core net and the P-GW on DeNB, set up GTPU tunnel respectively.

Wherein, transmit described Relay data to comprise further: the common control channel of the wireless access network element that Relay provides makes the user data as Relay, be transferred to transmission network by the access node being positioned at DeNB or core net, and arrive core net control network element or access network elements from transmission network;

When the access node transmitting the order of described common control channel is positioned on DeNB, optionally, is terminated by DeNB and process;

Or, transmit described Relay data to comprise further: the chain of command dedicated signaling of the UE that Relay administers and user face data are as the user data of Relay, be transferred to transmission network by the access node being positioned at DeNB or core net, and arrive from transmission network the transmission network access network element that core net control network element, access network elements or UE are positioned at core net.

Relay of the present invention is by the transmission network access node be positioned in core net and the transmission network access node be positioned on DeNB, access transmission network simultaneously, and the transmission channel set up respectively between different transmission network access node transmits Relay data.

Adopt the present invention, solve the limitation of the wireless relay system only having a transmission channel, access while making Relay compatible core net and DeNB, that is, Relay is by being positioned at transmission network access node in core net and being positioned at the access node of the local transmission network on DeNB, access different transmission networks simultaneously, to set up two transmission channels, avoid in prior art the limitation that a single transmission channel can only be adopted to exist separately, thus solve the problem of the Relay transfer of data comprising handoff scenario.

Accompanying drawing explanation

Fig. 1 is the structural representation of cellular radio communication system in prior art;

Fig. 2 is the structural representation of Relay network in prior art;

Fig. 3 is the configuration diagram of LTE network in prior art;

Fig. 4 is the network architecture schematic diagram of example 1,2,3 of the present invention;

Fig. 5 is the Relay access process schematic diagram of example 2 of the present invention;

Fig. 6 is UE access and the switching flow schematic diagram of example 3 of the present invention;

Fig. 7 is the network architecture schematic diagram of the embodiment of the present invention 4,5;

Fig. 8 is UE access and the switching flow schematic diagram of example 5 of the present invention;

Fig. 9 is the network architecture schematic diagram of example 6 of the present invention.

Embodiment

Basic thought of the present invention is: Relay is by the transmission network access node be positioned in core net and the transmission network access node be positioned on DeNB, core network access and DeNB simultaneously, and the transmission channel set up respectively between different transmission network access node transmits Relay data.

Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme.

Be applied to a transmission system for wireless relay, this system comprises: one group of Relay and group eNB, and eNB is as the DeNB of Relay.Here, Relay, eNB and DeNB are existing, are not specifically addressed here.This system also comprises: at least two the transmission network access nodes be connected with Relay.Wherein, Relay, for by the transmission network access node be positioned in core net and the transmission network access node be positioned on DeNB, access transmission network simultaneously, and the transmission channel set up respectively between different transmission network access node transmits Relay data.

Here, the transport address that every bar transmission channel has specifically comprises: be responsible for the address distributed by the transmission network access node corresponding with current transmission channel.

Here, the mode of setting up of transmission channel specifically comprises: set up the mode that packet data network (PDN) is connected between Relay with transmission network access node.

Here, transmission network access node specifically comprises: P-GW, and P-GW is optionally positioned in core net or on DeNB.Transmission channel specifically comprises: inner at DeNB, and the general packet wireless service tunnel protocol of the user level set up between DeNB and S-GW/P-GW (GTPU) tunnel.

Here, Relay data specifically comprise: the chain of command dedicated signaling of the UE that the common control channel of the wireless access network element that Relay provides makes, the user face data of Relay self or Relay administer and user face data.

Here, different transmission channels has different transport addresses.The method comprises further: the transmission network access node corresponding with current transmission channel, is responsible for distributing transport address to current transmission channel.

Here, Relay sets up transmission channel and specifically comprises between different transmission network access node: between RELAY and transmission network access node, sets up transmission channel, and enter transmission network respectively by the mode setting up PDN connection.

Here, transmission network access node specifically comprises: P-GW; Transmission channel specifically comprises: GTPU tunnel.Between Relay and the S-GW/P-GW in core net and the P-GW on DeNB, set up PDN respectively and connect; And inner at DeNB, and between DeNB to the P-GW in core net and the P-GW on DeNB, set up GTPU tunnel respectively.

Here, transmit Relay data and comprise following two kinds of situations further:

The common control channel of the wireless access network element that the first situation: Relay provides makes the user data as Relay, be transferred to transmission network by the access node being positioned at local DeNB or core net, and arrive core net control network element or access network elements from transmission network.

Wherein, when the access node transmitting common control channel order is positioned on local DeNB, optionally, is terminated by DeNB and process.

The chain of command dedicated signaling of the UE that the second situation: Relay administers and user face data are as the user data of Relay, be transferred to transmission network by the access node being positioned at local DeNB or core net, and arrive from transmission network the transmission network access network element that core net control network element, access network elements or UE are positioned at core net.

The present invention mainly comprises following content:

One group of Relay, for UE provides wireless access.One group of eNB, for via node provides wireless access.The i.e. DeNB of described Relay.

Via node has at least two access nodes to transmission network simultaneously, and one is positioned at core net, such as P-GW; Another is positioned on DeNB, also can be called the local transmission network access node on DeNB, such as LBO P-GW.

Further, via node sets up transmission channel from different transmission network access nodes, and different passages has different transport addresses, such as IP address, is responsible for distributing this transport address respectively by the transmission network access node of correspondence.

Further, the mode of setting up of transmission channel by setting up with P-GW the mode that PDN is connected, can enter transmission network by P-GW.In this manner Relay can respectively be positioned at core net and set up PDN with the P-GW on DeNB and be connected.And inner at DeNB, and between DeNB to P-GW, set up GTPU tunnel.

Further, make as providing the common control channel of wireless access network element for Relay, the public flow process of such as S1AP, the public flow process of X2AP can be delivered to transmission network as the user data of Relay by the access node of Relay, here, the access node of Relay comprises this locality or core net, and arrive core net control network element from transmission network, the MME of such as Relay or access network elements, such as eNB; When the access node transmitting common signaling is positioned on local DeNB, optionally, can be terminated by DeNB and process.

Further, the chain of command dedicated signaling of the UE that via node is administered, such as S1AP private processes, X2AP specialty flow process and data can be delivered to transmission network as the user data of Relay by the access node of Relay, here, the access node of Relay comprises this locality or core net, and arrives core net control network element from transmission network, the MME of such as UE or access network elements, such as eNB or UE is positioned at the transmission network access network element of core net, the P-GW of such as UE.

In sum, contrast prior art and the present invention known: in prior art, because Relay can only access a single transmission channel, therefore, such as, when having occurred data transmission problems under handoff scenario and had influence on switching, do not possess and select mechanism, this transmission channel can only be adopted.And the present invention, owing to adopting two transmission channels simultaneously, can have complementary advantages to respective transmission channel, such as, possess on the basis of two transmission channels at the same time, channel selecting mechanism can be realized, when there is data transmission problems in a transmission channel, enable another transmission channel, thus, the problem of the Relay transfer of data comprising handoff scenario can be solved.

Carry out citing to the present invention below to set forth.

Example 1:

This example describes a kind of network architecture in the present invention, as shown in Figure 4.Wherein, Relay has two transmission network access nodes: one is the local LBO GW be positioned on DeNB, corresponding on DeNB for Relay sets up local transmission path 10 1; Another is the Relay P-GW being positioned at core net, is easyly to unify with S-GW in figure; Corresponding between DeNB and Relay P-GW for Relay sets up far-end transmission channel 102.The Un interface of different transmission channels between Relay and DeNB is all transmitted by radio bearer 103.

Direct interface X2 passage 111 between Relay and other eNB, the signaling on this interface and data as the business datum of Relay, by local transmission path 10 1 from Relay via the LBO GW DeNB, be sent to corresponding eNB.

The UE accessed by Relay, their S1 signalling path 112 is routed to the P-GW of Relay as the business datum of Relay via DeNB from Relay by far-end transmission channel 102, and arrived UE MME separately from the latter by transmission network.

The UE accessed by Relay, their data channel 113 passes through far-end transmission channel 102 as the business datum of Relay, is routed to the P-GW of Relay from Relay via DeNB, and is arrived UE P-GW separately from the latter by transmission network.

When UE is switched to abutting subdistrict that eNB builds access by the access of Relay Suo Jian community, between source Relay and target eNB, carry out X2 switching flow by direct interface X2 passage 111.In handoff procedure anti-pass path be also by direct interface X2 passage 111, through DeNB arrive target eNB.

Here, it is pointed out that in Fig. 4, the region representation that local transmission path 10 1 is filled with dotted line; The region representation that far-end transmission channel 102 is filled with middle solid line; The region representation that radio bearer 103 is filled with heavy line; Direct interface X2 passage 111 is filled with the shade of sparse left oblique line and is represented; S1 signalling path 112 is filled with the shade of sparse point and is represented; Data channel 113 is filled with the shade of cross spider and is represented.

Example 2:

This example describes the access procedure of above-mentioned example 1 via node, and framework is see the framework of example 1 as described in Figure 4, and the flow process of this example as shown in Figure 5, comprises the following steps:

Step 501:Relay in DeNB wireless coverage, and sets up RRC with this DeNB and is connected.

Step 502:Relay initiates Attach request by Non-Access Stratum signaling to core net, and this demand signalling is carried between Relay and DeNB by RRC information and transmits on eating dishes without rice or wine; Be that Relay selects MME by DeNB, and be carried between DeNB and selected MME by S1 message and transmit.

Step 503:MME is selected by the log-on message of Relay after receiving the request of the Attach in step 502, or is specified the P-GW serving Relay being positioned at EPC by Relay oneself.And between MME and this P-GW, initiate carrying Establishing process.Carrying at least comprises a default bearing, optionally comprises many dedicated bearers.The P-GW of Relay is Relay distributing IP address in the process, i.e. IP_1.

Step 504: be the carrying Resources allocation that step 503 is set up on DeNB and Relay.By setting up the context flow process of UE between MME and DeNB, by RRC reprovision flow process between DeNB to Relay.And in the process, carried the response that the Attach in step 502 is asked by aforementioned messages.And the IP_1 distributed in step 503 is notified Relay.

After above-mentioned steps normally completes, transmission channel 1 is established between the P-GW serving Relay in Relay and EPC, that is: the far-end transmission channel 102 in example 1, the PDN that this transmission channel is set up on core net P-GW by Relay in this example connects appointment.Relay obtains IP address ip _ 1 on this PDN connects.This PDN connection at least has a default bearing, optionally has more than one dedicated bearer.

Step 505:Relay is from OAM download configuration.This flow process as the business datum of Relay, by the acquiescence in transmission channel 1 or dedicated bearer.Be routed to the P-GW of Relay by Relay, and be sent to OAM by P-GW.

After Relay successfully obtains configuration, can set up community with the identity of eNB, and set up S1 with at least one MME and be connected, Establishing process is carried by transmission channel 1, for UE provides wireless access.

Step 506:Relay, with the identity of UE, initiates the PDN request of connecting by Non-Access Stratum signaling to core net.This demand signalling is carried between Relay and DeNB by RRC information and transmits on eating dishes without rice or wine; Be carried between DeNB and MME by S1 message and transmit.In this request, the required foundation of instruction is that local PDN connects.

Step 507:MME, after receiving the request of connecting of the PDN in step 506, judges to need to select local P-GW, so select the P-GW resided on DeNB.Carrying Establishing process is initiated between MME and local P-GW.Carrying at least comprises a default bearing, optionally comprises many dedicated bearers.Local P-GW is Relay distributing IP address in the process, i.e. IP_2.

Step 508: be the carrying Resources allocation that step 507 is set up on DeNB and Relay.By setting up E-RAB Establishing process between MME and DeNB, by RRC reprovision flow process between DeNB to Relay.And in the process, carry the response to the request of connecting of the PDN in step 506 by aforementioned messages.And the IP_2 distributed in step 507 is notified Relay.

After above-mentioned steps normally completes, between Relay and the LBO GW residing at DeNB, establish transmission channel 2, that is: the local transmission path 10 1 in example 1.The PDN that this transmission channel is set up on LBO GW by Relay in this example connects appointment.Relay obtains IP address ip _ 2 on this PDN connects.This PDN connection at least has a default bearing, optionally has more than one dedicated bearer.

Step 509: by configuration or dynamic monitoring, Relay decision-making needs to set up direct interface with eNB A or eNB B.Relay initiates to be connected with the transport layer of eNB A or eNB B the foundation with X2 mouth.The signaling of Establishing process, as the data of Relay, uses the acquiescence in transmission channel 2 or dedicated bearer.Be routed to the LBO GW on DeNB by Relay, and be sent to target eNB by LBO GW according to transport layer address.

Embodiment 3:

Present embodiment describes the access procedure of UE under via node in above-described embodiment 1, and switch to the handoff procedure under adjacent macrocell by via node jurisdiction district.Framework is see the framework of example 1 as described in Figure 4, and the flow process of this example as shown in Figure 6, comprises the following steps:

Step 601:UE in Relay wireless coverage, and sets up RRC with this Relay and is connected.

Step 602:UE initiates Attach request by Non-Access Stratum signaling to core net, and this demand signalling is being eated dishes without rice or wine, and namely Uu is carried between UE and Relay by RRC information and transmits; Be UE selection MME by Relay and carried by S1 message, Relay is using S1 message as business datum, and the far-end transmission channels 102 entering Relay by Un carrying 103 arrive the P-GW of Relay in core net, and arrives selected MME by transmission network.

The MME of step 603:UE is receiving the request of the Attach in step 602 for UE selection S-GW/P-GW, and initiates the carrying Establishing process between S-GW/P-GW.Carrying at least comprises a default bearing, optionally comprises many dedicated bearers.

Step 604: eating dishes without rice or wine, i.e. Uu and Un, and ground side is the carrying Resources allocation that step 603 is set up.E-UTRAN Radio Access Bearer (E-RAB, E-UTRAN Radio Access Bearer) is distributed by UE context Establishing process flow process between MME and Relay.After signaling arrives the P-GW of Relay in core net, arrive Relay as business datum by far-end transmission channel 102 and Un carrying 103.Distributed Data Radio Bearer transmission (DRB, Data Radio Bearer) of Uu mouth by RRC reprovision flow process between Relay and UE.And in the process, carried the response that the Attach in step 602 is asked by aforementioned messages.

After the above step, the user face Path Setup for transmitting the UE of the user face data that UE is correlated with completes.When UE is accessed by Relay, wherein, 121 parts are the DRB between UE and Relay, fill represent with the shade of sparse right oblique line; 122 parts are the GTPU tunnel between the P-GW of Relay and UE, fill represent with the shade of sparse vertical line.122 parts are nested within Relay far-end transmission channel 102.

Step 605:UE sends measurement report to Relay, and Relay decision-making also triggers handoff procedure,

Step 606:Relay initiates handover request to target eNB, wherein carry the contextual information of UE, and the configuration information of anti-pass passage, what adopt in LTE system is GTP-U tunnel protocol, relevant configuration parameter has the IP address of source and the Tunnel End Point Identifier (TEID, Tunnel End ID) of GTP-U.Handover request, by local transmission path 10 1, enters transmission network from DeNB and arrives target eNB.

Step 607: target eNB receives handover request, and after receiving, preserve corresponding contextual information and configuration information, and reply handover acknowledge to Relay.Handover acknowledge message at least should be carried, and the Uu of UE in Target cell configures, and as reconfiguration message, can carry the opposite end configuration information in anti-pass tunnel.Handover acknowledge, by local transmission path 10 1, arrives Relay from Un carrying 103.

After source Relay receives handover acknowledge, anti-pass tunnel 131 has been set up.The part of anti-pass tunnel 131 between Relay and DeNB is nested in local transmission path 10 1.Wherein, anti-pass tunnel 131 is filled with the shade of intensive point and is represented.

Step 608:UE, according to the configuration of eating dishes without rice or wine obtained in step 607, initiates RRC reconfiguration request to Relay, and obtains from target eNB and reshuffled.

Step 609: target eNB transmit path handover request, to the MME of UE, wherein carries the configuration needing to be switched to new transmission channel, if transmission channel is to still using GTP-U tunnel, then the destination address of transmission channel and TEID.The P-GW/S-GW more new bearer of UE can be notified, the configuration in amendment transmission tunnel after MME receives request.In this process by descending transmission tunnel end, i.e. the P-GW/S-GW of the address notice UE of target eNB, latter can return to the address of a uplink tunnel end, returns to target eNB by MME.

After the above step, the user face Path Setup that UE is new completes.Wherein, 141 parts are the DRB between UE and target eNB, fill represent with the shade of intensive right oblique line; 142 parts are the GTPU tunnel between target eNB and the P-GW of UE, fill represent with the shade of intensive vertical line.

Step 610: ideal eNB sends UE release command to Relay, and is discharged in anti-pass tunnel 131 after data inverse-transmitting is complete.Wherein, anti-pass tunnel 131 is filled with the shade of intensive point and is represented.

Example 4:

This example describes the another kind of network architecture of the present invention, as shown in Figure 7.Wherein, Relay has two transmission network access nodes: one is the local LBO GW be positioned on DeNB, corresponding on DeNB for Relay sets up local transmission passage 201; Another is the Relay P-GW being positioned at core net, is easyly to unify with S-GW in figure; Corresponding between DeNB and Relay P-GW for Relay sets up far-end transmission channel 202.The Un interface of different transmission channels between Relay and DeNB is all transmitted by radio bearer 203.

Direct interface X2 passage 211 between described Relay and other eNB, the signaling on this interface and data as the business datum of Relay, by local transmission passage 201 from Relay via the LBO GW DeNB, be sent to corresponding eNB.

The S1 signalling path 212 of described Relay as the business datum of Relay, by local transmission passage 201.Can be terminated by DeNB for common signaling and process, the dedicated signaling of being correlated with for UE arrives on UE MME separately from Relay via the LBO GW DeNB.

The UE accessed by described Relay, their data channel 213 passes through far-end transmission channel 202 as the business datum of Relay, is routed to the P-GW of RELAY from Relay via DeNB, and is arrived UE P-GW separately from the latter by transmission network.

When UE is switched to abutting subdistrict that eNB builds access by the access of Relay Suo Jian community, between source Relay and target eNB, carry out X2 switching flow by direct interface X2 passage 211.In handoff procedure anti-pass path be also by direct interface X2 passage 211, through DeNB arrive target eNB.

Under this framework, the access way of Relay is substantially identical with example 2, unique difference is after Relay obtains configuration parameter by OAM, S1 setup is dealt into DeNB by local transmission passage 201 by Relay, and is processed this signaling by DeNB, and replys S1 setup Rsp.

Here, it is pointed out that in Fig. 7, the region representation that local transmission passage 201 is filled with dotted line; The region representation that far-end transmission channel 202 is filled with middle solid line; The region representation that radio bearer 203 is filled with heavy line; Direct interface X2 passage 211 is filled with the shade of sparse left oblique line and is represented; S1 signalling path 212 is filled with the shade of sparse point and is represented; Data channel 213 is filled with the shade of cross spider and is represented.

Example 5:

This example describes the access procedure of UE under via node in above-mentioned example 4, and switches to the handoff procedure under adjacent macrocell by via node jurisdiction district.Framework participates in the framework see example 4 as described in Figure 7, and the flow process of this example as shown in Figure 8, comprises the following steps:

Step 701:UE in Relay wireless coverage, and sets up RRC with this Relay and is connected.

Step 702:UE initiates Attach request by Non-Access Stratum signaling to core net, and this demand signalling is being eated dishes without rice or wine, and namely Uu is carried between UE and Relay by RRC information and transmits; Relay carries this signaling by S1 message and as business datum, the local transmission passage 201 entering Relay by Un carrying 203 arrives DeNB, then is that UE selects MME and forwards by DeNB.

The MME of step 703:UE is receiving the request of the Attach in step 702 for UE selection S-GW/P-GW, and initiates the carrying Establishing process between S-GW/P-GW.Carrying at least comprises a default bearing, optionally comprises many dedicated bearers.

Step 704: eating dishes without rice or wine, i.e. Uu and Un, and ground side is the carrying Resources allocation that step 703 is set up.E-UTRAN Radio Access Bearer E-RAB is distributed by UE context Establishing process flow process between MME and Relay.The P-GW of Relay and UE can mutual notification transmission layer address and be separately the GTPU Tunnel Identifier TEID of UE distribution in this process.Wherein Relay can use access node to be positioned at the transmission channel of core net, i.e. the IP address of far-end transmission channel 202 association is as transport address, and the optional carrying change triggered in far-end transmission channel 202.MME and DeNB of UE transmits signaling by normal S1 interface, and arrives Relay from DeNB by local transmission passage 201 and Un carrying 203.Distributed the Data Radio Bearer transmission DRB of Uu mouth by RRC reprovision flow process between Relay and UE.And in the process, carried the response that the Attach in step 702 is asked by aforementioned messages.

After the above step, the user face Path Setup for transmitting the UE of the user face data that UE is correlated with completes.When UE is accessed by Relay, wherein, 221 parts are the DRB between UE and Relay, fill represent with the shade of sparse right oblique line; 222 parts are the GTPU tunnel between the P-GW of Relay and UE, fill represent with the shade of sparse vertical line.The P-GW of the transport address notice UE of far-end transmission channel 202 is employed, so 222 parts are nested within the far-end transmission channel 202 of Relay due to Relay.

Step 705:UE sends measurement report to Relay, and Relay decision-making also triggers handoff procedure.

Step 706:Relay initiates handover request to target eNB, wherein carries the contextual information of UE, and the configuration information of anti-pass passage, and what adopt in LTE system is GTP-U tunnel protocol, and relevant configuration parameter has the IP address of source and the TEID of GTP-U.Handover request, by local transmission passage 201, enters transmission network from DeNB and arrives target eNB.

Step 707: target eNB receives handover request, and after receiving, preserve corresponding contextual information and configuration information, and reply handover acknowledge to Relay.Handover acknowledge message at least should be carried, and the Uu of UE in Target cell configures, and as reconfiguration message, can carry the opposite end configuration information in anti-pass tunnel.Handover acknowledge, by local transmission passage 201, arrives Relay from Un carrying 203.

After source Relay receives handover acknowledge, anti-pass tunnel 231 has been set up.The part of anti-pass tunnel 231 between Relay and DeNB is nested in local transmission passage 201.Wherein, anti-pass tunnel 231 is filled with the shade of intensive point and is represented.

Step 708:UE, according to the configuration of eating dishes without rice or wine obtained in step 707, initiates RRC reconfiguration request to Relay, and obtains from target eNB and reshuffled.

Step 709: target eNB transmit path handover request, to the MME of UE, wherein carries the configuration needing to be switched to new transmission channel, if transmission channel is to still using GTP-U tunnel, then the destination address of transmission channel and TEID.The P-GW/S-GW more new bearer of UE can be notified, the configuration in amendment transmission tunnel after MME receives request.In this process by descending transmission tunnel end, i.e. the P-GW/S-GW of the address notice UE of target eNB, latter can return to the address of a uplink tunnel end, returns to target eNB by MME.

After the above step, the user face Path Setup that UE is new completes.Wherein, 241 parts are the DRB between UE and target eNB, fill represent with the shade of intensive right oblique line; 242 parts are the GTPU tunnel between target eNB and the P-GW of UE, fill represent with the shade of intensive vertical line.

Step 710: ideal eNB sends UE release command to Relay, and is discharged in anti-pass tunnel 231 after data inverse-transmitting is complete.

Example 6:

This example describes the another kind of network architecture of the present invention, as shown in Figure 9.Wherein, Relay has two transmission network access nodes: one is the local LBO GW be positioned on DeNB, corresponding on DeNB for Relay sets up local transmission passage 301; Another is the Relay P-GW being positioned at core net, is easyly to unify with S-GW in figure; Corresponding between DeNB and Relay P-GW for Relay sets up far-end transmission channel 302.The Un interface of different transmission channels between Relay and DeNB is all transmitted by radio bearer 303.

Direct interface X2 passage 311 between described Relay and other eNB, the signaling on this interface and data as the business datum of Relay, by local transmission passage 301 from Relay via the LBO GW DeNB, be sent to corresponding eNB.

The UE accessed by described Relay, their data channel 312 passes through local transmission passage 301 as the business datum of Relay, from Relay via the LBO GW DeNB, is sent to corresponding UE P-GW.

The S1 signalling path 313 of described Relay, as the business datum of Relay, by far-end transmission channel 302, is routed to the P-GW of Relay via DeNB from Relay, and arrived UE P-GW separately from the latter by transmission network.

Here, it is pointed out that in Fig. 9, the region representation that local transmission passage 301 is filled with dotted line; The region representation that far-end transmission channel 302 is filled with middle solid line; The region representation that radio bearer 303 is filled with heavy line; Direct interface X2 passage 311 is filled with the shade of sparse left oblique line and is represented; S1 signalling path 313 is filled with the shade of sparse point and is represented; Data channel 312 is filled with the shade of cross spider and is represented.

Here, the wireless access network more than related to represents with Radio Access Network, is abbreviated as RAN; Relay station represents with Relay Node/Relay Station; Grand UE represents with Macro UE; Relaying UE represents with Relay UE; The link that direct transfers represents with direct link; Uply to represent with uplink, be abbreviated as UL; Descendingly to represent with downlink, be abbreviated as DL; Access link represents with access link; Back haul link represents with backhaul link; Business data flow represents with Service Data Flows; Un carrying is radio bearer.

The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.

Claims

1. one kind is applied to the transmission system of wireless relay, this system comprises: one group of via node Relay and group evolved base station eNB, described eNB is as the host base station DeNB of described Relay, it is characterized in that, this system also comprises: at least two the transmission network access nodes be connected with described Relay;

Wherein, described Relay, for by the transmission network access node be positioned in core net and the transmission network access node be positioned on DeNB, access transmission network simultaneously, and the transmission channel set up respectively between different transmission network access node transmits Relay data; The mode of setting up of transmission channel specifically comprises: set up the mode that packet data network PDN is connected between described Relay with described transmission network access node.

2. system according to claim 1, is characterized in that, every bar transmission channel has transport address, and transport address specifically comprises: be responsible for the address distributed by the transmission network access node corresponding with current transmission channel.

3. system according to claim 1, is characterized in that, described transmission network access node specifically comprises: packet data network gateway P-GW, and P-GW is optionally positioned in core net or on DeNB;

Described transmission channel specifically comprises: inner at DeNB, and the general packet wireless service tunnel protocol GTPU tunnel of the user level set up between DeNB and P-GW.

4. system according to any one of claim 1 to 3, is characterized in that, described Relay data specifically comprise: the user face data of Relay self; Described Relay data also comprise: the chain of command dedicated signaling of the UE that common control channel makes or Relay administers of the wireless access network element that Relay provides and user face data.

5. one kind is applied to the transmission method of wireless relay, it is characterized in that, the method comprises: Relay is by the transmission network access node be positioned in core net and the transmission network access node be positioned on DeNB, access transmission network simultaneously, and the transmission channel set up respectively between different transmission network access node transmits Relay data; Described Relay, sets up described transmission channel and specifically comprises between different transmission network access node:

6. method according to claim 5, is characterized in that, different transmission channels has different transport addresses;

7. method according to claim 5, is characterized in that, described transmission network access node specifically comprises: P-GW; Described transmission channel specifically comprises: GTPU tunnel;

8. the method according to any one of claim 5 to 6, it is characterized in that, transmit described Relay data to comprise further: the common control channel of the wireless access network element that Relay provides makes the user data as Relay, be transferred to transmission network by the access node being positioned at DeNB or core net, and arrive core net control network element or access network elements from transmission network;