CN106304242B

CN106304242B - A kind of multi-hop communication system and its node

Info

Publication number: CN106304242B
Application number: CN201510264045.4A
Authority: CN
Inventors: 施小娟
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2015-05-21
Filing date: 2015-05-21
Publication date: 2018-12-21
Anticipated expiration: 2035-05-21
Also published as: WO2016184150A1; CN106304242A

Abstract

The present invention provides a kind of multi-hop communication system and its node；The system, including: includes user equipment (UE), an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network in a communication path of the multi-hop communication system, the gateway node is characterized in that, for being communicated with the equipment of the core network by the S1 interface by establishing S1 interface between wired backhaul and the equipment of the core network；It is also used to by establishing wireless backhaul Ub interface between wireless backhaul link and one of routing node of at least one intermediary routing node, is communicated by the Ub interface with the intermediary routing node；It is also used to by establishing logic S1 interface between wireless backhaul link and the initial access node, is communicated by the logic S1 interface with the initial access node.

Description

A kind of multi-hop communication system and its node

Technical field

The present invention relates to the communications field more particularly to a kind of multi-hop communication systems and its node.

Background technique

Cellular wireless mobile communication system develops since the 1980s, meets the voice communication of the mankind from the beginning Demand develops the basic data communication requirement for finally gradually meeting the mankind on the basis of voice service.Honeycomb in the prior art Wireless communication system is disposed and is runed by wireless carriers, and the careful planning of operator is passed through in the construction of network, as Fig. 1 is The network topology schematic diagram of cellular radio access network in the prior art, in Fig. 1, each macro base station (macro (e) NB, MNB) Addressing is planned by operator and is determined that each macro base station can achieve several hundred rice even wireless coverage of several kms, so as to reality Nearly continuity seamless coverage in existing operator region.

With the arrival in mobile interchange epoch, new mobile application demand, especially those require high quality, high-speed, There is the growth of explosion type in the mobile application demand of low delay, according to industry prediction, in coming 10 years, wireless mobile services Thousands of times of growth will occur in amount, and it is so huge to realize that the wireless communication system of covering macro over long distances cannot achieve in the prior art Capacity requirement.On the other hand, industry is found by the statistics to user's communication behavior and habit, most of high data traffic Mobile service concentration appears in indoor environment and hot zones, such as market, school, user's family, large size performance, marketplace Have the characteristics that area distribution is wide Deng, indoor environment and hot zones and dissipate, single regional scope is small, user's concentration, the prior art The wide covering of middle cellular radio, uniform fold, fixed covering feature make it that can not well adapt to this zonule model The characteristic that interior service set occurs is enclosed, in addition, cellular radio for example is built due to various in the prior art The blocking etc. of object will cause cellular radio signal indoors environment be not so good as outdoor environment, this but also in the prior art honeycomb without Gauze network is unable to satisfy the large data capacity demand under indoor environment in future.

To solve the above problems, a kind of wireless access network minor node (small radio access network node, SRAN-node it) comes into being.In concept, wireless access network minor node refers to transmission power macro base station than in the prior art Transmission power it is low to the coverage area also small wireless access network node of the coverage area of macro base station than in the prior art, therefore Wireless access network minor node is referred to as low power nodes (Lower Power Node, LPN), specifically can be micro-base station (Pico Node), Home eNodeB (Femto/Home (e) NB), wireless relay access device (Relay) and other may go out For existing any transmission power far below macro base station in the prior art, user equipment can link access network by wireless communication Access network equipment.And it is the huge capacity promotion demand for meeting future broadband wireless communication systems, in particular in adaptation specific region Centralized big data quantity requirement, industry prediction can increase the deployment density of SRAN-node in specific region to realize net The growth of network capacity, meets user demand, and the network industry of this dense deployment in specific region is referred to as super-intensive network (Ultra Dense Network, UDN).Fig. 2 is deployment in the specific region of cellular radio access network in the prior art The schematic diagram of UDN, wherein in the mansion shown in 200, in the stadium shown in 210, the hot spot region shown in 230 deploys A large amount of SRAN-node.

Network capacity can be improved in UDN, and while improving network capacity, following network is also not intended to increase network Capital expenditure (Capital Expenditure, CAPEX) and operation expenditure (Operating Expense, OPEX), this just anticipates Taste the deployment of UDN need to reduce artificial plan, optimization and management, can be according to network topology, network load, business demand Deng indoors, outdoor hot spot region or high traffic region complete flexible rapid deployment, and realize self-configuring, self-optimizing and From healing.Realize that all these targets, industry generally believe that only part or a small amount of SRAN-node can be by having in UDN Line connects (wired backhaul), such as optical fiber, cable core network access equipment, and other SRAN-node are then needed support Wireless backhaul (wireless backhaul), the characteristic disposed using short distance intensive between SRAN-node, passes through SRAN- Wireless backhaul link between node realizes interconnecting between SRAN-node, and passes through two by wireless backhaul link Wireless connection (one jump) between a SRAN-node or successively by the wireless connection (multi-hop) between multiple SRAN-node Core network access equipment.

Dense deployment is needed in the following UDN a large amount of SRAN-node, and the even a large amount of SRAN-node in part therein it Between further through wireless backhaul link realization interconnect, and by one jump or multi-hop wireless connect core network access equipment. Therefore the technical issues of establishing the communication system for realizing the data communication under intensive multi-hop scene, being achievement urgent need to resolve.

Summary of the invention

The present invention provides a kind of multi-hop communication system and its node, and technical problems to be solved are that how to establish realization intensive The communication system of data communication under multi-hop scene.

In order to solve the above technical problems, the present invention provides the following technical scheme that

A kind of multi-hop communication system includes user equipment (UE), one in one communication path of the multi-hop communication system Initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, in which:

The initial access node establishes wireless access Uu interface for passing through between wireless access links and the UE, Pass through the Uu interface and the UE communication；It is also used to by establishing logic S1 between wireless backhaul link and the gateway node Interface is communicated by the logic S1 interface with the gateway node；It is also used to through wireless backhaul link and described at least one One of intermediary routing node in a intermediary routing node establishes wireless backhaul Ub interface, by the Ub interface with it is described Intermediary routing node communication；

The intermediary routing node, for passing through wireless backhaul link and the initial access node and/or the gateway Wireless backhaul Ub interface is established between node and/or other intermediary routing nodes, realizes data described by the Ub interface Relay transmission between initial access node and gateway node；

The gateway node, for passing through by establishing S1 interface between wired backhaul and the equipment of the core network The S1 interface is communicated with the equipment of the core network；It is also used to save by wireless backhaul link and at least one described intermediate routing Wireless backhaul Ub interface is established between one of routing node of point, it is logical by the Ub interface and the intermediary routing node Letter；It is also used to pass through the logic S1 by establishing logic S1 interface between wireless backhaul link and the initial access node Interface is communicated with the initial access node.

Wherein, the gateway node includes the first protocol stack, second protocol stack and third protocol stack；

Wherein first protocol stack is used to carry the S1 interface between the gateway node and the equipment of the core network；Institute Second protocol stack is stated for carrying the logic S1 interface between the gateway node and the initial access node；The third association View stack is used to carry the Ub interface between the gateway node and one intermediary routing node；

First protocol stack successively includes L1 layers, L2 when the control plane for carrying the S1 interface from top to bottom Layer, IP layers of Internet Protocol, SCTP layers of Flow Control Transmission Protocol and S1-AP layers of S1 interface application protocol；When described for carrying When the user face of S1 interface, from top to bottom successively including L1 layers, L2 layers, IP layers, User Datagram Protocol UDP layer and user face GTP-U layers of GPRS Tunnel Protocol；

The second protocol stack successively includes IP when the control plane for carrying the logic S1 interface from top to bottom Layer, SCTP layers and S1-AP protocol layer；It from top to bottom successively include IP when the user face for carrying the logic S1 interface Layer, UDP layer and GTP-U layers；

The third protocol stack successively includes the physical layer realized using Wireless LAN WLAN technology from top to bottom PHY, media intervention control MAC layer and logical link control LLC layer；

Wherein, the second protocol stack is carried on the third protocol stack.

Wherein, the third protocol stack further include:

IP layers, it is located on LLC layer.

Wherein, the gateway node realizes the gateway proxy between the UE and the equipment of the core network, specifically includes:

Two tunnels GTP-U are established for the evolved packet system carrying EPS bearer of the UE, one builds on core Between net device service gateway S-GW/ grouped data network gateway P-GW and the gateway node, another builds on the net Between artis and the initial access node；

Wherein, the tunnel GTP-U between the equipment of the core network S-GW/P-GW and the gateway node is carried on the net On S1 interface between artis and the equipment of the core network；GTP- between the gateway node and the initial access node The tunnel U is carried on the logic S1 interface between the gateway node and the initial access node.

Wherein, the gateway node completes described two as the gateway proxy between the UE and the equipment of the core network One-to-one mapping between a tunnel GTP-U.

Wherein, the gateway node realizes the initial access node S-GW/P-GW agent functionality, specifically includes:

The EPS for carrying all UE for accessing the initial access node is established for the initial access node The evolved packet system node aggregation of bearer carries EPS-node bearer；In the gateway node and the initial access The tunnel GTP-U for carrying the EPS-node bearer is established on the logic S1 interface of node.

Wherein, the gateway node is completed to carry the second of the first protocol stack of the S1 interface and the carrying Ub interface The conversion of the following protocol layer of link layer between protocol stack including link layer, specific to complete:

Conversion between the LLC layer of the L1 layer of first protocol stack and L2 layers and second protocol stack, MAC layer and PHY layer；

When the gateway node completes protocol layer conversion, the protocol layer on link layer does not change；

The gateway node is converted into mesh according to the transforming relationship inside gateway node, by source link layer and following protocol layer Mark link layer and protocol layer below.

Wherein, the initial access node includes the 4th protocol stack, the 5th protocol stack and the 6th protocol stack；

Wherein, the 4th protocol stack is used to carry the Uu interface between the initial access node and the UE；It is described 5th protocol stack is used to carry the logic S1 interface between the initial access node and the gateway node；6th agreement Stack is used to carry the Ub interface between the initial access node and one intermediary routing node；

4th protocol stack, when the control plane for carrying the Uu interface, from top to bottom successively include PHY layer, MAC layer, wireless spread-spectrum technology rlc layer, PDCP layers of Packet Data Convergence Protocol, radio resource control RRC layer and non-access NAS Layer；It from top to bottom successively include PHY layer, MAC layer, rlc layer and PDCP layer when the user face for carrying the Uu interface；

5th protocol stack successively includes IP when the control plane for carrying the logic S1 interface from top to bottom Layer, SCTP layers and S1-AP layers；When the user face for carrying the logic S1 interface, from top to bottom successively include IP layers, UDP layer and GTP-U layers；

6th protocol stack successively includes PHY, MAC and LLC protocol layer realized using WLAN technology from top to bottom；

Wherein, the 4th protocol stack is carried on the 5th protocol stack.

Wherein, the 6th protocol stack further include:

IP layers, it is located on LLC layer.

Wherein, the initial access node establishes the EPS bearer of the UE in institute between the gateway node After stating the tunnel GTP-U between initial access node and the gateway node, the initial access node is with the UE described Radio bearer RB is established on Uu interface, the initial access node is arranged one-to-one between the EPS bearer and the RB Mapping.

Wherein, the initial access node is completed to carry the 4th protocol stack of the Uu interface and carries the Ub interface The conversion of the following protocol layer of link layer between 6th protocol stack including link layer, specific to complete:

Conversion between the L1 layer of the LLC of 4th protocol stack, MAC, PHY protocol layer and the 6th protocol stack and L2 layers；

When the initial access node completes protocol layer conversion, the protocol layer on link layer does not change；

The initial access node is according to the transforming relationship inside initial access node, by source link layer and following protocol layer It is converted into Target Link-Layer and view layer below.

Wherein, the intermediary routing node includes the 7th protocol stack, and the 7th protocol stack is for carrying the intermediate routing section Point and the Ub interface between the initial access node and/or the gateway node and/or other intermediary routing nodes；

7th protocol stack successively includes the PHY realized using WLAN technology and MAC layer and LLC layer from top to bottom.

Wherein, the 7th protocol stack further include:

IP layers, it is located on LLC layer.

A kind of gateway node in multi-hop communication system includes user in one communication path of the multi-hop communication system Equipment UE, an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, the net Artis is characterized in that, S1 interface is established between wired backhaul and the equipment of the core network for passing through, by described S1 interface is communicated with the equipment of the core network；It is also used to through wireless backhaul link and at least one intermediary routing node Wireless backhaul Ub interface is established between one of routing node, is communicated by the Ub interface with the intermediary routing node； It is also used to pass through the logic S1 interface by establishing logic S1 interface between wireless backhaul link and the initial access node It is communicated with the initial access node.

The third protocol stack successively includes the physical layer PHY realized using WLAN technology, media intervention control from top to bottom MAC layer processed and logical link control LLC layer；

Wherein, the second protocol stack is carried on the third protocol stack.

Wherein, the third protocol stack further include:

IP layers, it is located on LLC layer.

A kind of initial access node in multi-hop communication system includes in one communication path of the multi-hop communication system User equipment (UE), an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, institute It states initial access node to be characterized in that, establishes wireless access Uu interface between wireless access links and the UE for passing through, Pass through the Uu interface and the UE communication；It is also used to by establishing logic S1 between wireless backhaul link and the gateway node Interface is communicated by the logic S1 interface with the gateway node；It is also used to through wireless backhaul link and described at least one One of intermediary routing node in a intermediary routing node establishes wireless backhaul Ub interface, by the Ub interface with it is described Intermediary routing node communication.

Wherein, the 4th protocol stack is carried on the 5th protocol stack.

Wherein, the 6th protocol stack further include:

IP layers, it is located on LLC layer.

Wherein, the initial access node establishes the EPSbearer of the UE in institute between the gateway node After stating the tunnel GTP-U between initial access node and the gateway node, the initial access node is with the UE described Radio bearer RB is established on Uu interface, the initial access node is arranged one-to-one between the EPS bearer and the RB Mapping.

A kind of intermediary routing node in multi-hop communication system includes in one communication path of the multi-hop communication system User equipment (UE), an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, institute It states intermediary routing node to be characterized in that, for passing through wireless backhaul link and the initial access node and/or the gateway Wireless backhaul Ub interface is established between node and/or other intermediary routing nodes, realizes data described by the Ub interface Relay transmission between initial access node and gateway node.

Wherein, the 7th protocol stack further include:

IP layers, it is located on LLC layer.

Embodiment provided by the invention is guaranteeing backwards compatibility, under the premise of reducing the influence to core net, realizes Low transmission time delay, inexpensive multi-hop communication system in UDN network.

Detailed description of the invention

Fig. 1 is the network topology schematic diagram of cellular radio access network in the prior art；

The schematic diagram that Fig. 2 is deployment UDN in the specific region of cellular radio access network in the prior art；

Fig. 3 is that the super-intensive network in certain area disposes schematic diagram；

Fig. 4 is the system architecture diagram of LTE macrocellular wireless communication system in the prior art；

Fig. 5 is the schematic diagram that UE passes through double bounce wireless backhaul core network access；

Fig. 6 is a kind of protocol stack structure schematic diagram of double bounce communication system of the present invention；

Fig. 7 is the protocol stack structure schematic diagram that the technology of the present invention method is used for single-hop communication system；

Fig. 8 is transmittance process figure of the down user data of the present invention in the system shown in the present invention；

Fig. 9 is a kind of structural block diagram for access network equipment that multi-hop communication system according to the present invention proposes.

Specific embodiment

To make the object, technical solutions and advantages of the present invention clearer, right below in conjunction with the accompanying drawings and the specific embodiments The present invention is described in further detail.It should be noted that in the absence of conflict, embodiment and implementation in the application Feature in example can mutual any combination.

For the expection for meeting the growth of thousands of times of portfolios of coming 10 years, UDN will be widely deployed to undertake a large number of services stream Amount.UDN can be deployed in indoor and outdoor hot spot region or any region for having high traffic demand.Fig. 3 is one certain Super-intensive network in region disposes schematic diagram, the infrastructure limitation of actual deployment network is considered, specifically such as in shown area Wired network port number is wired in domain, and not increase the CAPEX of deployment and Operation Network and OPEX, realizes flexibly and fast Dispose the network, in 8 SRAN-node shown in Fig. 3, there is cable network end in the position that only minor node 303 and 310 is disposed Mouthful, it can equipment of the core network, OAM equipment etc. are connected to by wire-line back haul shown in solid black in figure, such as 303 can connect To equipment 302, and 310 may be coupled to equipment 301.And the position that other 6 minor nodes are disposed is without cable network Port, thus these minor nodes can only by these minor nodes and surrounding other minor nodes between wireless backhaul, by one jump Wireless backhaul or multi-hop wireless backhaul be connected to minor node 303 perhaps minor node 310 eventually by minor node 303 or 310 Cable port be connected to equipment of the core network, OAM equipment etc..

For the user equipment (User Equipment, UE) in UDN, such as the UE311 in figure, 311 by wireless Access link (radio access link) accesses between the minor node 308,311 of its position and equipment of the core network 302 Data transmission needs to be transmitted by 308 by the wireless backhaul link between 308 and 305, then is passed through between 305 and 303 by 305 Wireless backhaul link transmission, could be completed eventually by the wired backhaul between 303 and 302 namely 311 and 302 it Between communication, centre is needed by double bounce wireless backhaul link.All minor nodes in Fig. 3, on the one hand can be by wirelessly connecing On the other hand incoming link and UE communication can pass through other small base station communications of wireless backhaul link and surrounding.

Fig. 4 is long term evolution (Long Term Evaluation, LTE) macrocellular wireless communication system in the prior art System architecture diagram, LTE system uses the flat architecture of internet protocol-based (Internet Protocol, IP), by evolution Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, E- UTRAN), evolved data core net (Evolved Packet Core, EPC) composition.Wherein EPC includes: mobile management unit (Mobility Management Entity, MME), gateway (Serving Gateway, S-GW), packet data network Gateway (PDN Gateway, P-GW).Wherein MME is responsible for control plane management, the place including mobile management, Non-Access Stratum signaling The control planes work such as context management of reason, user；S-GW is responsible for transmission, forwarding and route handoff of UE user face data etc.； P-GW is the node for connecting EPC and bag data net such as internet, is responsible for the distribution such as UE IP address, IP data packet presses service class Type is filtered into business data flow (service data flow) and is tied to corresponding transmission carrying.E-UTRAN includes each macro Base station (eNB).

In Fig. 4, each eNB is connected to EPC by S1 interface, including is connect by control plane S1-MME interface with MME, leads to User face S1-U interface is crossed to connect with S-GW/P-GW.When there is the user face data of UE to need to transmit, MME can be established for UE and be used In the EPS bearer (Evolved Packet System bearer) of transmission data, specifically, being controlled by MME in S-GW/ GTP-U (the GPRS Tunnelling for being used for transmission UE user face data is established between the eNB that P-GW and UE are accessed Protocol User Plane, GTP-U) tunnel, then UE (sending data to P-GW for UE) or P-GW (are used for P-GW Data are sent to UE) user face data of UE is packaged into GTP-U number according to the packet encapsulation format of GTP-U agreement defined According to being carried on the tunnel GTP-U of the foundation after packet, completed via the tunnel GTP-U between the eNB and the P-GW The transmission of UE user face data.It should be noted that S-GW and P-GW can be located on the same physical equipment, can also be located at On different physical equipments, when S-GW and P-GW is located on different physical equipments, it is also required between the two as the EPS Bearer establishes one section of tunnel GTP-U between S-GW and P-GW.

It in Fig. 4, is connected between each eNB by X2 interface, when there is UE user face data to need to transmit between two eNB When, the tunnel GTP-U for being used for transmission UE user face data is established between two eNB, then eNB is advised according to GTP-U agreement The user face data of UE is packaged into the GTP-U that the foundation is carried on after GTP-U data packet by fixed packet encapsulation format On tunnel, the transmission of UE user face data is completed via the tunnel GTP-U between described two eNB.

For the UE in UDN, after one minor node of UE access, data transmission is probably needed through the trifle Then point is jumped even multi-hop wireless backhaul by one by the minor node again and is connected to after one or more other minor node Core net can be transferred to.By taking the UE 311 in Fig. 3 as an example, Fig. 5 gives UE 311 and passes through double bounce wireless backhaul core network access Schematic diagram, the present invention in, by UE access minor node, the path by one or multi-hop wireless backhaul core network access is known as The communication path of the UE, wherein the SRAN-node1 in Fig. 5, SRAN-node2, SRAN-node3 are respectively corresponded in Fig. 3 308,305,303.When thering are data to need to transmit between UE and S-GW/P-GW, if continuing the communication party using the prior art Formula, for example using the communication mode of LTE shown in Fig. 4, need between S-GW/P-GW and SRAN-node3, SRAN-node3 with The tunnel GTP-U is established between SRAN-node2 and between SRAN-node2 and SRAN-node1 to carry the transmission of data, this Kind data transfer mode will cause the very big delay of data transmission and the processing complexity of each minor node caused to improve, therefore have Multi-hop communication system in other words multi-hop communication framework of necessity research suitable for UDN.

In the present invention, by taking Fig. 5 as an example, wireless access links between UE and its minor node SRAN-node1 accessed after The continuous label continued to use in the relevant technologies (LTE) is labeled as Uu interface, and the wireless backhaul link between SRAN-node is labeled as Ub Interface, and the wire-line back haul interface between SRAN-node3 and MME and S-GW/P-GW continues to continue to use in the relevant technologies (LTE) Label, is respectively labeled as S1-MME interface and S1-U interface.In the present invention, each minor node both supported by Uu interface and UE it Between communication, and support through communication between Ub interface and other minor nodes.

By taking communication path of the UE in Fig. 5 by double bounce wireless backhaul core network access as an example, Fig. 6 is a kind of double bounce of the present invention The protocol stack structure schematic diagram of communication system (communication path of UE is double bounce communication path).

In multi-hop communication system, in a communication path include at least user equipment (UE), initial access node, one or more A intermediary routing node, gateway node and equipment of the core network.Wherein, initial access node, intermediary routing node, gateway node are equal For SRAN-node, different functions is completed in multihop system.Initial access node accesses net by wireless access links for UE The SRAN-node of network, such as the SRAN-node1 in Fig. 6；Intermediary routing node be realize initial access node and gateway node it Between communication to finally realize access initial access node UE and equipment of the core network between communication provide relay transmission, such as SRAN-node2 in Fig. 6；Gateway node is connected to equipment of the core network by wire-line back haul to finally realize that access initially connects Communication between the UE and equipment of the core network of ingress, such as the SRAN-node3 in Fig. 6.

As shown in fig. 6, wirelessly connecing by related wireless cellular technology between UE and initial access node SRAN-node1 Incoming link Uu interface communication, related wireless cellular technology such as LTE technology, by establishing nothing between UE and initial access node Line carries (Radio Bear, RB) to realize that data are transmitted, therefore as shown in fig. 6, Uu interface both ends, UE and SRAN-node1 On respectively include physical layer (Physical Layer, PHY) and link layer from top to bottom, link layer specifically includes matchmaker in LTE Body access layer (Media Access Control, MAC), wireless chain control layer (Radio Link Control, RLC), number According to packet convergence protocol (Packet Data Convergence Protocol, PDCP), if for transmitting control on Uu interface Face information processed, then on PDCP layers the end UE further include radio resource control layer (Radio Resource Control, RRC) and Non-access control layer (Non-Access-Stratum, NAS), the end SRAN-node1 further includes rrc layer.It should be noted that this hair It is bright specifically by taking the relevant technologies in LTE system as an example, but this is not intended to limit Uu interface using other existing the relevant technologies, such as entirely Ball mobile communication system (Global System for Mobile Communication, GSM), (Universal Mobile Communication System Universal Mobile Telecommunication System, UMTS) etc. technologies, correspond in the related technology, Uu interface The protocol layer at both ends can change according to the relevant technologies.In the present invention, pass through phase between UE and initial access node SRAN-node1 Close the wireless access links Uu interface communication of wireless cellular technology, it is ensured that backwards compatibility, so that having existed in the market Lowest version UE can access multi-hop communication system of the invention, enjoy the network service of UDN.

As shown in fig. 6, passing through the wire transmission Netcom of related wireless cellular technology between gateway node and equipment of the core network Letter, related wireless cellular technology such as LTE technology realize number by establishing S1 interface between gateway node and equipment of the core network According to transmission, specifically, using Fig. 5 as example, the interface established between gateway node SRAN-node3 and equipment of the core network MME is S1-MME interface (S1 control plane interface), then correspondingly, on the both ends of S1-MME interface, SRAN-node3 and MME from top to bottom Physical layer (Layer1, L1), link layer (Layer2, L2) and transport layer (Transport layer) are respectively included, is transmitted here Layer is IP-based protocol stack, from top to bottom successively includes IP (Internet Protocol)/SCTP (Stream Control Transmission Protocol)/S1-AP(S1Application Protocol).Gateway node SRAN-node3 and core The interface established between net equipment S-GW/P-GW is S1-U interface in the user plane, then correspondingly, S1-U interface both ends, SRAN- L1, L2 and Transport layer are respectively included on node3 and S-GW/P-GW from top to bottom, transport layer here is equally base It from top to bottom successively include IP/UDP (User Datagram Protocol)/GTP-U in the agreement of IP.It also needs to illustrate , here specifically by taking LTE system as an example, but this is not intended to limit S1 interface using other existing the relevant technologies, and is applied to it He it is existing in the related technology when, the interface name between the title and gateway node and equipment of the core network of equipment of the core network can Can be different from title herein, but the effect of the logic function completed and the interface established is identical.In the present invention, gateway node By the wire transmission Network Communication of related wireless cellular technology between equipment of the core network, it can accomplish influence to core net most It is small, it might even be possible to zero influence accomplished on core net to be said, so that avoiding the introducing of UDN network causes to open the upgrading of core net Pin.

On the one hand gateway node SRAN-node3 in Fig. 6 is the gateway proxy between UE and equipment of the core network；Another party Face, optimization, gateway node SRAN-node3 can also be the S-GW/P- for the initial access node SRAN-node1 that UE is accessed GW。

Gateway node is the gateway proxy between UE and equipment of the core network, i.e., from UE, gateway node is the core of the UE Heart net equipment (MME/S-GW/P-GW), and from core net, gateway node is that UE accesses " initial access node ".Tool Body, for an EPS bearer of UE, the present invention will establish two tunnels GTP-U, a foundation for the EPS bearer Between S-GW/P-GW and gateway node SRAN-node3, another builds on gateway node SRAN-node3 and UE and is accessed Initial access node SRAN-node1 between, gateway node can be completed as the gateway proxy between UE and equipment of the core network One-to-one mapping between described two tunnels GTP-U.Here, the EPS bearer of UE only exists the core on equipment of the core network One section of tunnel GTP-U between heart net equipment and gateway node, therefore in core net, gateway node is that the UE is " initial Access node ", and the EPS bearer of UE is only existed on initial access node between the initial access node and gateway node One section of tunnel GTP-U, therefore in UE, gateway node is the equipment of the core network of the UE.Gateway node conduct in the present invention Gateway proxy between UE and equipment of the core network can effectively reduce UE and move between the SRAN-node of each dense deployment of UDN Influence when dynamic to core net.

Gateway node is the S-GW/P-GW for the initial access node SRAN-node1 that UE is accessed, specifically, in the present invention When the initial access node and core net accessed for UE by it carries out data transmission, the present invention is in initial access node The EPS bearer for carrying all UE on SRAN-node1 is established between SRAN-node1 and gateway node SRAN-node3 SRAN-node1 node aggregation EPS bearer (to avoid obscuring between UE EPS bearer, here labeled as EPS-node bearer), it establishes between SRAN-node1 and SRAN-node3 for carrying the EPS-node bearer's The tunnel GTP-U is (for obscuring between the tunnel GTP-U that avoids and established by the EPS bearer of UE, here labeled as GTP- node-U).S-GW/P-GW of the gateway node as the UE initial access node accessed in the present invention can initially to connect The data transmission procedure for communicating similar UE between ingress and core net accomplishes that system is most to the additional effect minimum of system Letter.

Corresponding to above-mentioned two function that gateway node is completed, i.e. gateway proxy function between UE and equipment of the core network and The S-GW/P-GW function of initial access node, in Fig. 6 shown in black double arrows between SRAN-node1 and SRAN-node3, To support above two functions (or only gateway support agent functionality), there are a logic S1 interface, which is carried on On the physical layer and link layer of SRAN-node1 and SRAN-node3 wireless backhaul link, correspond to control plane interface from it is lower to On successively include IP/SCTP/S1-AP, correspond to interface in the user plane from top to bottom successively include IP/UDP/GTP-U.

As the gateway node in multi-hop communication system, SRAN-node3 also needs to pass through between other SRAN-node Wireless backhaul link is communicated, and therefore, gateway node is in addition to the S1 interface between above-mentioned foundation and equipment of the core network, Yi Jishi Gateway proxy function between existing UE and equipment of the core network, and the S- of initial access node that is accessed of realization UE of optimization Except GW/P-GW function, SRAN-node3 also needs to establish wireless backhaul Ub between intermediary routing node SRAN-node2 and connects Mouthful.

Ub interface is communicated using Wireless LAN (Wireless Local Area Network, WLAN) technology, WLAN is respectively included from top to bottom on the both ends of Ub interface, intermediary routing node SRAN-node2 and gateway node SRAN-node3 The PHY of technology, MAC and logical link control layer (Logical Link Control, LLC), optimization, may be used also on LLC layer To include IP layers.When data packet reaches gateway node SRAN-node3, SRAN-node3 does link layer and agreement below The protocol stack (L1/L2) of primary conversion, that is, the protocol stack (LLC/MAC/PHY) and S1 interface of completing Ub mouthfuls of WLAN is converted, agreement When conversion, the protocol stack of Transport-Protocol does not change, and gateway node SRAN-node3 is according to Internal reforming pass System, by source link layer and following protocol conversion at Target Link-Layer and following agreement.If also IP layers on LLC layer, gateway Node SRAN-node3 when carrying out protocol conversion, by the data conversion from S1 interface at Uu interface data when, increase IP Layer, by increased IP layers the data packet of UE may be implemented between SRAN-node each in multi-hop communication system of the present invention Routing, specific IP layers of realization multihop routing, the relevant technologies are highly developed, and the present invention repeats no more.If not having on LLC layer There are IP layers, routing of the data packet of UE between SRAN-node each in multi-hop communication system of the present invention, according in WLAN technology Related route technology is realized, for example is realized according to the wireless mesh network technology (MESH) of WLAN, specifically can basis 802.11s agreement (Part 11:Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 10:Mesh Networking) it realizes, the present invention repeats no more.

Likewise, as the initial access node in multi-hop communication system on the one hand SRAN-node1 is established between UE Uu interface, radio bearer is established on Uu interface come realize data transmit, on the other hand with the gateway as its S-GW/P-GW Logic S1 interface is established between node, in addition to this, SRAN-node1 also needs between other SRAN-node by wirelessly returning Journey link is communicated, and the nothing between the intermediary routing node SRAN-node2 in other SRAN-node, such as Fig. 6 is established Line backhaul Ub interface.Likewise, Ub interface is communicated using WLAN technology, and the both ends of Ub interface, initial access node SRAN- The PHY of WLAN technology, MAC and LLC layer are respectively included on node1 and intermediary routing node SRAN-node2 from top to bottom, is optimized , it can also include IP layers on LLC layer.When data packet reaches initial access node SRAN-node1, one side SRAN- Node1 is according to establishing EPS bearer on the logic S1 interface between SRAN-node3 and SRAN-node1 and in SRAN- Mapping relations when RB are established on Uu interface between node1 and UE, complete data packet between EPS bearer and RB bear Mapping, wherein SRAN-node1 establishes the GTP-U tunnel for carrying the EPS bearer between SRAN-node3 Behind road, SRAN-node1 establishes RB on the Uu interface between SRAN-node1 and UE, and EPS is arranged in SRAN-node1 One-to-one mapping between bearer and RB.Link layer and agreement below are done primary conversion by another aspect SRAN-node1, The protocol stack (PDCP/RLC/MAC/PHY) of the protocol stack (LLC/MAC/PHY) and Uu interface of completing Ub mouthfuls of WLAN is converted, association When view conversion, protocol stack more than link layer does not change, SRAN-node1 according to Internal reforming relationship, by source link layer and Following protocol conversion is at Target Link-Layer and following agreement.

Intermediary routing node is to realize that the communication between initial access node and gateway node accesses just to finally realize Communication between the UE and equipment of the core network of beginning access node provides relay transmission, thus intermediary routing node communicate with its He establishes wireless backhaul Ub interface between SRAN-node, in Fig. 6, intermediary routing node SRAN-node2 and initial access are saved Point SRAN-node1 and gateway node SRAN-node3 establishes Ub interface, on two end nodes of Ub interface, protects respectively from top to bottom The PHY of WLAN technology, MAC and LLC layer are stayed, can also include IP layers on the LLC layer of optimization.In the present invention, adopted on Ub interface It is transmitted with the physical layer of WLAN technology and link layer, on the one hand can reduce propagation delay time, it on the other hand, can be simply real Multihop routing in existing multihop system, minimizes the expense of SRAN equipment and multihop system.

It should be noted that in the agreement station structure schematic diagram of double bounce communication system shown in fig. 6, three SRAN-node, SRAN-node1, SRAN-node2, SRAN-node3 are respectively the initial access node of the UE, centre routing section in Fig. 6 Point and gateway node, in practical application, for other UE, these three nodes can be used as the initial access section of other UE Point, SRAN-node1 can also be used as the intermediary routing node of other UE.

Using technical method of the invention, it can guarantee backwards compatibility, under the premise of reducing the influence to core net, Low transmission time delay, inexpensive multi-hop communication system in realization UDN network.Furthermore, it is necessary to explanation, technology shown in the present invention Method can equally be well applied to the scene of the communication carried out in UDN by single-hop wireless backhaul, if Fig. 7 is the technology of the present invention method For the protocol stack structure schematic diagram of single-hop communication system, in figure, the Uu between UE and initial access node SRAN-node1 is connect Mouthful with the Uu interface in Fig. 6, S1 interface between gateway node SRAN-node3 and equipment of the core network with the S1 interface in Fig. 6, The function that access node SRAN-node1 and gateway node SRAN-node3 are realized respectively in Fig. 6 SRAN-node1 and Ub interface between SRAN-node3, SRAN-node1 and SRAN-node3 is the same as the description in Fig. 6 to Ub interface.

Based on double bounce communication system protocol stack architecture schematic diagram shown in fig. 6, Fig. 8 gives and uses under the double bounce communication system The transmittance process of family downlink data in systems, comprising:

Step 801, EPS bearer and associated tunnel and radio bearer are established

When the UE shown in Fig. 6 has downlink business to need to transmit, under the control of equipment of the core network MME, held for UE foundation Carry the EPS bearer of the UE downlink data transmission and associated tunnel and radio bearer for carrying the EPS bearer.Tool Body includes:

Under MME control, in the initial access node SRAN-node1 that S-GW/P-GW and UE are accessed eventually by wired Interface is connected to the one section of GTP-U tunnel established between the gateway node SRAN-node3 of core net for carrying the EPS bearer Road, and establish between the gateway node SRAN-node3 and the initial access node SRAN-node1 for carrying this The tunnel other end GTP-U of EPS bearer, and the one-to-one correspondence in setting two sections of tunnels GTP-U closes at SRAN-node3 System.

Under MME or SRAN-node3 control, the EPS bearer for carrying all UE on SRAN-node1 is established SRAN-node1 EPS-node bearer and carry the SRAN-node1 and SRAN- of the EPS-node bearer The tunnel GTP-node-U between node3.

After SRAN-node1 is received and established the notice of the EPS bearer for the UE, under SRAN-node1 control The RB for the EPS bearer described in Uu interface bearing is established between SRAN-node1 and UE, and is set at SRAN-node1 Set the one-to-one relationship between RB the and EPS bearer.

It should be noted that according to the business demand of UE multiple EPS bearer and one-to-one correspondence can be established for the UE Associated tunnel and radio bearer.

It should be noted that the transmission path of downlink data is it has been determined that i.e. in the transmittance process of downlink data of the present invention Data pass to SRAN-node3 from core net, then from SRAN-node3 by intermediary routing node SRAN-node2 transmitting SRAN-node1, the selection course in specific path has the relevant technologies to determine, not in the present invention program scope.

802, UE data packet is packaged into EPS bearer on the tunnel GTP-U of S1 interface, passes to SRAN-node3.

When having the data packet of UE to reach core net, S-GW/P-GW is carried to according to the business feature of the data packet Correspondence meets on the EPS bearer of business feature, and data envelope is specifically attached to corresponding EPS bearer in S1 interface On the tunnel GTP-U, SRAN-node3 is passed to.

803, it after SRAN-node3 receives the data from core net, performs the following operation:

(1) SRAN-node3 decapsulates the data packet from S1 interface, and the data envelope after decapsulation is attached to the EPS On the tunnel GTP-U of logic S1 interface of the bearer between SRAN-node3 and SRAN-node1, then encapsulation is obtained Data packet is encapsulated between SRAN-node3 and SRAN-node1 again as the EPS-node bearer foundation of SRAN-node1 On the tunnel GTP-node-U；

Specifically, the data after decapsulation are encapsulated into the EPS bearer in SRAN-node3 and SRAN- here On the tunnel GTP-U of logic S1 interface between node1, its essence is by the EPS bearer in core net and SRAN-node3 Between one section of tunnel GTP-U and one section of tunnel between SRAN-node3 and SRAN-node1 between converted, specifically Conversion includes changing the transport Layer address (Transport Layer address) in tunnel, GTP tunnel Endpoint ID (GTP Tunnel Endpoint Identifier, GTP TEIDs) etc..

(2) data packet that the encapsulation is completed is transformed on the protocol stack of Ub interface WLAN and passes by SRAN-node3 It is defeated, pass to SRAN-node2；

804, after SRAN-node2 receives data packet, according to routing, data are forwarded a packet into SRAN-node2 and SRAN- On Ub interface between node1, SRAN-node1 is passed to.

According to preceding description, the transmission path of downlink data is realized it has been determined that specifically routing by IP layers in the present invention, Or it can be by route technology related in WLAN technology.

805, after SRAN-node1 receives data packet, data packet is decapsulated, according to the EPS bearer and the Uu Data packet after decapsulation is transformed on the protocol stack of Uu interface by the corresponding relationship of the RB of interface, is packaged into Uu interface RB The data packet of upper transmitting is sent to UE.So far, downlink data is transmitted to UE.

The multi-hop communication system proposed according to the present invention, the present invention also propose a kind of access network equipment, the access network equipment Applied to wireless access network minor node or base station etc., as shown in Figure 9.

When initial access node of the access network equipment in the multi-hop communication system at least as user equipment (UE) goes out Now, it includes at least with lower module:

901 protocol stack translation modules: the conversion of link layer and following protocol layer, the association of Ub mouthfuls of WLAN of concrete implementation are realized The protocol stack (PDCP/RLC/MAC/PHY) for discussing stack (LLC/MAC/PHY) and Uu interface is converted；

902Uu functional module interface: it realizes the Uu interface established between UE, is wrapped respectively from top to bottom corresponding to Uu interface Include the protocol layers such as PHY/MAC/RLC/PDCP；It is embodied as UE EPS bearer and establishes corresponding radio bearer on Uu interface；

903S1 functional module interface: the logic S1 interface established between the gateway node that it is finally connected is realized, described The tunnel GTP-U for carrying the EPS bearer of UE is established on S1 interface between gateway node and is established for carrying it certainly The tunnel GTP-node-U of the EPS-node bearer of body.It from top to bottom successively include IP/ corresponding to the control plane of S1 interface The protocol layers such as SCTP/S1-AP, user face corresponding to S1 interface successively protocol layers such as including IP/UDP/GTP-U from top to bottom；

904Ub functional module interface: realization establishes it and (for example realizes intermediary routing node function with other access network equipments Or the access network equipment of gateway node function) between Ub interface, respectively include WLAN's from top to bottom corresponding to Ub interface Protocol stack (LLC/MAC/PHY) preferably can also include ip protocol layer；

When the access network equipment at least occurs as gateway node in the multi-hop communication system, include at least following Module:

901 protocol stack translation modules: the conversion of link layer and following protocol layer, the association of Ub mouthfuls of WLAN of concrete implementation are realized The protocol stack (L1/L2) for discussing stack (LLC/MAC/PHY) and S1 interface is converted；

903S1 functional module interface: realizing the S1 interface established between equipment of the core network (MME/S-GW/P-GW), The tunnel GTP-U for carrying the EPS bearer of UE is established on the S1 interface between equipment of the core network；

Realize the logic S1 interface established between initial access node；

Corresponding to the control plane of S1 interface, successively protocol layers such as including IP/SCTP/S1-AP, connect corresponding to S1 from top to bottom Mouthful user face successively protocol layers such as including IP/UDP/GTP-U from top to bottom；

904Ub functional module interface: realization establishes it and (for example realizes intermediary routing node function with other access network equipments Or the access network equipment of initial access node function) between Ub interface, respectively included from top to bottom corresponding to Ub interface The protocol stack (LLC/MAC/PHY) of WLAN preferably can also include ip protocol layer；

906 initial access node core net function porxy modules: realize that the S-GW/P-GW of initial access node acts on behalf of function Can, it establishes between initial access node on the S1 interface established between initial access node and described is initially connect for carrying The tunnel GTP-node-U of the EPS-node bearer of ingress；

907 gateway proxy functions: the gateway proxy function of UE and equipment of the core network (MME/S-GW/P-GW) are realized, comprising:

The tunnel GTP-U for carrying the EPS bearer of UE is established between initial access node, and described in completion That is established between the tunnel GTP-U and 903S1 functional module interface and equipment of the core network of foundation is used to carry the institute of the UE State the one-to-one mapping relationship between the tunnel GTP-U of EPS bearer.

When the access network equipment at least occurs as intermediary routing node in the multi-hop communication system, include at least With lower module:

904Ub functional module interface: realization establish its with other access network equipments (such as realize gateway accessing point function or The access network equipment of person's initial access node function) between Ub interface, respectively include WLAN from top to bottom corresponding to Ub interface Protocol stack (LLC/MAC/PHY), preferably can also include ip protocol layer；

905 data relay sending module: realizing after source access network equipment reception data, be transmitted to target access network and set It is standby；

It should be noted that the access network equipment in the multi-hop communication system, can provide a variety of node identities In the presence of, for example an access network equipment can be that be used as intermediary routing node to exist again as initial access node, then the access Net equipment function when providing as initial access node and function when as intermediary routing node simultaneously；For another example, one Access network equipment can be used as gateway node to exist again as initial access node, then the access network equipment provides conduct simultaneously Function when initial access node and function when as gateway node.

According to the access network equipment in multi-hop communication system set forth above and multi-hop communication system, below to the present invention Each node in multi-hop communication system is illustrated:

A kind of gateway node in multi-hop communication system includes user in one communication path of the multi-hop communication system Equipment UE, an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, wherein institute Gateway node is stated, for passing through the S1 interface by establishing S1 interface between wired backhaul and the equipment of the core network It is communicated with the equipment of the core network；It is also used to wherein one by wireless backhaul link and at least one intermediary routing node Wireless backhaul Ub interface is established between a routing node, is communicated by the Ub interface with the intermediary routing node；It is also used to By establishing logic S1 interface between wireless backhaul link and the initial access node, by the logic S1 interface with it is described Initial access node communication.

First protocol stack successively includes L1 layers, L2 when the control plane for carrying the S1 interface from top to bottom Layer, IP layers, SCTP layers of Flow Control Transmission Protocol and S1-AP layers of S1 interface application protocol；When the use for carrying the S1 interface When the face of family, from top to bottom successively including L1 layers, L2 layers, IP layers, User Datagram Protocol UDP layer and user face GPRS Tunnel Protocol GTP-U layers；

Wherein, the second protocol stack is carried on the third protocol stack.

Wherein, the third protocol stack further include:

IP layers, it is located on LLC layer.

A kind of initial access node in multi-hop communication system includes in one communication path of the multi-hop communication system User equipment (UE), an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, Described in initial access node, for passing through institute by establishing wireless access Uu interface between wireless access links and the UE State Uu interface and the UE communication；It is also used to by establishing logic S1 interface between wireless backhaul link and the gateway node, It is communicated by the logic S1 interface with the gateway node；It is also used to through wireless backhaul link and described among at least one One of intermediary routing node in routing node establishes wireless backhaul Ub interface, passes through the Ub interface and the intermediate road It is communicated by node.

Wherein, the 4th protocol stack is carried on the 5th protocol stack.

Wherein, the 6th protocol stack further include: IP layers, be located on LLC layer.

Conversion between LLC layer, MAC layer and the PHY layer of 4th protocol stack and the L1 layer of the 6th protocol stack and L2 layers；

A kind of intermediary routing node in multi-hop communication system includes in one communication path of the multi-hop communication system User equipment (UE), an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, Described in intermediary routing node, for by wireless backhaul link and the initial access node and/or the gateway node, And/or wireless backhaul Ub interface is established between other intermediary routing nodes, realize data described initial by the Ub interface Relay transmission between access node and gateway node.

Wherein, the 7th protocol stack further include: IP layers, be located on LLC layer.

From the above, it can be seen that under the premise of reducing the influence to core net, realizing UDN network guaranteeing backwards compatibility In low transmission time delay, inexpensive multi-hop communication system.

Those of ordinary skill in the art will appreciate that computer journey can be used in all or part of the steps of above-described embodiment Sequence process realizes that the computer program can be stored in a computer readable storage medium, the computer program exists (such as system, unit, device) executes on corresponding hardware platform, when being executed, include the steps that embodiment of the method it One or combinations thereof.

Optionally, integrated circuit can be used also to realize in all or part of the steps of above-described embodiment, these steps can To be fabricated to integrated circuit modules one by one respectively, or make multiple modules or steps in them to single integrated electricity Road module is realized.In this way, the present invention is not limited to any specific hardware and softwares to combine.

Each device/functional module/functional unit in above-described embodiment, which can be adopted, is realized with general computing device realization, it Can be concentrated on a single computing device, can also be distributed over a network of multiple computing devices.

Each device/functional module/functional unit in above-described embodiment realized in the form of software function module and as Independent product when selling or using, can store in a computer readable storage medium.Computer mentioned above Read/write memory medium can be read-only memory, disk or CD etc..

The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to protection scope described in claim.

Claims

1. a kind of multi-hop communication system, which is characterized in that set in a communication path of the multi-hop communication system including user Standby UE, an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, in which:

The initial access node, for passing through by establishing wireless access Uu interface between wireless access links and the UE The Uu interface and the UE communication；It is also used to connect by establishing logic S1 between wireless backhaul link and the gateway node Mouthful, it is communicated by the logic S1 interface with the gateway node；Be also used to by wireless backhaul link and it is described at least one One of intermediary routing node in intermediary routing node establishes wireless backhaul Ub interface, by the Ub interface and it is described in Between routing node communicate；

The intermediary routing node, for passing through wireless backhaul link and the initial access node and/or the gateway section Wireless backhaul Ub interface is established between point and/or other intermediary routing nodes, realizes data described first by the Ub interface Relay transmission between beginning access node and gateway node；

The gateway node establishes S1 interface for passing through, by described between wired backhaul and the equipment of the core network S1 interface is communicated with the equipment of the core network；It is also used to through wireless backhaul link and at least one intermediary routing node Wireless backhaul Ub interface is established between one of routing node, is communicated by the Ub interface with the intermediary routing node； It is also used to pass through the logic S1 interface by establishing logic S1 interface between wireless backhaul link and the initial access node It is communicated with the initial access node.

2. system according to claim 1, it is characterised in that:

The gateway node includes the first protocol stack, second protocol stack and third protocol stack；

Wherein first protocol stack is used to carry the S1 interface between the gateway node and the equipment of the core network；Described Two protocol stacks are used to carry the logic S1 interface between the gateway node and the initial access node；The third protocol stack For carrying the Ub interface between the gateway node and one intermediary routing node；

First protocol stack, when the control plane for carrying the S1 interface, from top to bottom successively include L1 layers, L2 layers, IP layers of Internet Protocol, SCTP layers of Flow Control Transmission Protocol and S1-AP layers of S1 interface application protocol；It is connect when for carrying the S1 When the user face of mouth, from top to bottom successively including L1 layers, L2 layers, IP layers, User Datagram Protocol UDP layer and user face GPRS tunnel Agreement GTP-U layers of road；

The second protocol stack, when the control plane for carrying the logic S1 interface, from top to bottom successively include IP layers, SCTP layers and S1-AP protocol layer；When the user face for carrying the logic S1 interface, from top to bottom successively include IP layers, UDP layer and GTP-U layers；

The third protocol stack successively includes physical layer PHY, the matchmaker realized using Wireless LAN WLAN technology from top to bottom Body intervention control MAC layer and logical link control LLC layer；

Wherein, the second protocol stack is carried on the third protocol stack.

3. system according to claim 2, which is characterized in that the third protocol stack further include:

IP layers, it is located on LLC layer.

4. system according to any one of claims 1 to 3, which is characterized in that the gateway node realizes the UE and described Gateway proxy between equipment of the core network, specifically includes:

Two tunnels GTP-U are established for the evolved packet system carrying EPS bearer of the UE, one builds on core net and sets Between standby gateway S-GW/ grouped data network gateway P-GW and the gateway node, another builds on the gateway section Between point and the initial access node；

Wherein, the tunnel GTP-U between the equipment of the core network S-GW/P-GW and the gateway node is carried on the gateway section On S1 interface between point and the equipment of the core network；GTP-U tunnel between the gateway node and the initial access node Road is carried on the logic S1 interface between the gateway node and the initial access node.

5. system according to claim 4, it is characterised in that:

The gateway node completes described two GTP-U tunnels as the gateway proxy between the UE and the equipment of the core network One-to-one mapping between road.

6. system according to any one of claims 1 to 3, which is characterized in that the gateway node realizes the initial access Node S-GW/P-GW agent functionality, specifically includes:

Establish the EPS bearer's for carrying all UE for accessing the initial access node for the initial access node Evolved packet system node aggregation carries EPS-node bearer；In patrolling for the gateway node and the initial access node It collects and establishes the tunnel GTP-U for carrying the EPS-node bearer on S1 interface.

7. system according to any one of claims 1 to 3, which is characterized in that

The gateway node complete to carry the first protocol stack of the S1 interface and carry the Ub interface second protocol stack it Between the following protocol layer of link layer including link layer conversion, it is specific to complete:

The gateway node is converted into object chain according to the transforming relationship inside gateway node, by source link layer and following protocol layer Road floor and protocol layer below.

8. system according to claim 1, which is characterized in that

The initial access node includes the 4th protocol stack, the 5th protocol stack and the 6th protocol stack；

Wherein, the 4th protocol stack is used to carry the Uu interface between the initial access node and the UE；Described 5th Protocol stack is used to carry the logic S1 interface between the initial access node and the gateway node；6th protocol stack is used Ub interface between the carrying initial access node and one intermediary routing node；

4th protocol stack successively includes PHY layer, MAC when the control plane for carrying the Uu interface from top to bottom Layer, wireless spread-spectrum technology rlc layer, PDCP layers of Packet Data Convergence Protocol, radio resource control RRC layer and NAS layers non-access；When It from top to bottom successively include PHY layer, MAC layer, rlc layer and PDCP layer when for carrying the user face of the Uu interface；

5th protocol stack, when the control plane for carrying the logic S1 interface, from top to bottom successively include IP layers, SCTP layers and S1-AP layers；It from top to bottom successively include IP layers, UDP layer when the user face for carrying the logic S1 interface With GTP-U layers；

Wherein, the 4th protocol stack is carried on the 5th protocol stack.

9. system according to claim 8, which is characterized in that the 6th protocol stack further include:

IP layers, it is located on LLC layer.

10. system according to claim 1 or 8, which is characterized in that

The EPS bearer that the initial access node establishes the UE between the gateway node initially connects described Behind the tunnel GTP-U between ingress and the gateway node, the initial access node and the UE are on the Uu interface Radio bearer RB is established, the one-to-one mapping between the EPS bearer and the RB is arranged in the initial access node.

11. system according to claim 1 or 8, which is characterized in that

The initial access node is completed to carry the 4th protocol stack of the Uu interface and carries the 6th agreement of the Ub interface The conversion of the following protocol layer of link layer between stack including link layer, specific to complete:

The initial access node converts source link layer and following protocol layer according to the transforming relationship inside initial access node At Target Link-Layer and view layer below.

12. system according to claim 1, which is characterized in that

The intermediary routing node include the 7th protocol stack, the 7th protocol stack for carry the intermediary routing node and it is described just Ub interface between beginning access node and/or the gateway node and/or other intermediary routing nodes；

13. system according to claim 12, which is characterized in that the 7th protocol stack further include:

IP layers, it is located on LLC layer.

It include user in a communication path of the multi-hop communication system 14. the gateway node in a kind of multi-hop communication system Equipment UE, an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, the net Artis is characterized in that, S1 interface is established between wired backhaul and the equipment of the core network for passing through, by described S1 interface is communicated with the equipment of the core network；It is also used to through wireless backhaul link and at least one intermediary routing node Wireless backhaul Ub interface is established between one of routing node, is communicated by the Ub interface with the intermediary routing node； It is also used to pass through the logic S1 interface by establishing logic S1 interface between wireless backhaul link and the initial access node It is communicated with the initial access node.

15. gateway node according to claim 14, it is characterised in that:

The third protocol stack successively includes the physical layer PHY realized using WLAN technology, media intervention control MAC from top to bottom Layer and logical link control LLC layer；

Wherein, the second protocol stack is carried on the third protocol stack.

16. gateway node according to claim 15, which is characterized in that the third protocol stack further include:

IP layers, it is located on LLC layer.

17. 4 to 16 any gateway node according to claim 1, which is characterized in that the gateway node realizes the UE Gateway proxy between the equipment of the core network, specifically includes:

18. gateway node according to claim 17, it is characterised in that:

19. 4 to 16 any gateway node according to claim 1, which is characterized in that the gateway node is realized described first Beginning access node S-GW/P-GW agent functionality, specifically includes:

20. 4 to 16 any gateway node according to claim 1, which is characterized in that

21. the initial access node in a kind of multi-hop communication system, include in a communication path of the multi-hop communication system User equipment (UE), an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, institute It states initial access node to be characterized in that, establishes wireless access Uu interface between wireless access links and the UE for passing through, Pass through the Uu interface and the UE communication；It is also used to by establishing logic S1 between wireless backhaul link and the gateway node Interface is communicated by the logic S1 interface with the gateway node；It is also used to through wireless backhaul link and described at least one One of intermediary routing node in a intermediary routing node establishes wireless backhaul Ub interface, by the Ub interface with it is described Intermediary routing node communication.

22. initial access node according to claim 21, which is characterized in that the initial access node includes the 4th association Discuss stack, the 5th protocol stack and the 6th protocol stack；

Wherein, the 4th protocol stack is carried on the 5th protocol stack.

23. initial access node according to claim 22, which is characterized in that the 6th protocol stack further include:

IP layers, it is located on LLC layer.

24. the initial access node according to claim 21 or 22, which is characterized in that

25. initial access node according to claim 22, which is characterized in that

26. the intermediary routing node in a kind of multi-hop communication system, include in a communication path of the multi-hop communication system User equipment (UE), an initial access node, at least one intermediary routing node, a gateway node and equipment of the core network, institute It states intermediary routing node to be characterized in that, for passing through wireless backhaul link and the initial access node and/or the gateway Wireless backhaul Ub interface is established between node and/or other intermediary routing nodes, realizes data described by the Ub interface Relay transmission between initial access node and gateway node.

27. intermediary routing node according to claim 26, which is characterized in that

28. intermediary routing node according to claim 27, which is characterized in that the 7th protocol stack further include:

IP layers, it is located on LLC layer.