WO2012126331A1

WO2012126331A1 - Method and system for transferring data

Info

Publication number: WO2012126331A1
Application number: PCT/CN2012/072387
Authority: WO
Inventors: 邓云
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-03-22
Filing date: 2012-03-15
Publication date: 2012-09-27
Also published as: CN102695290B; CN102695290A

Abstract

Disclosed are a method and system for transferring data. The method comprises: an access network element of a first access network acquiring address information of an access network element of a second access network; the access network element of the first access network establishing an interface with the access network element of the second access network on the basis of the address information; the access network element of the first access network and the access network element of the second access network transferring a signaling and/or data via the interface. In the present invention, a cross-system direct interface is established, thus not only reducing data delay, but also reducing cross-system switchover delay, and lowering network maintenance costs for the operator.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a data transmission method and system. 1 is a schematic diagram of a 3GPP access system architecture according to the related art. As shown in FIG. 1, an architectural diagram of a 3GPP access system includes a radio access network part and a core network part, wherein the radio access network part includes GSM EDGE. The GSM EDGE Radio Access Network (GERAN), the Universal Mobile Telecommunications System (UMTS) access network, and the Long-Term Evolution (LTE) access network. Specifically, both the access network of the GERAN and the UMTS are connected to the Serving General Packet Radio Service Supporting Node (SGSN) of the core network element service, and the mobility of the LTE access network and the core network element The management entity (Mobility Management Entity, MME for short) is connected. The RANTS includes a Base Station Subsystem (BSS), and includes a Base Station Controller (BSC) and a Base Station (BS). The UMTS access network element includes a wireless network. The controller (Radio Network Controller, RNC for short) and the base station (NodeB); the access network element of the LTE is an Evolved NodeB (abbreviated as e B). In order to ensure that the user equipment (User Equipment, UE for short) in the connected state can move freely between different access systems, an S3 interface is established between the SGSN and the MME, and the interface can implement the terminal between different access systems. Switch. In order to achieve a higher transmission rate, 3GPP proposes a carrier aggregation (Carrier Aggregation, CA for short) technical solution, which uses multiple carriers (or multiple serving cells) to simultaneously serve user equipment. The existing carrier aggregation scheme mainly utilizes multiple carriers in a single system to simultaneously provide services for user equipment. For example, two or more carriers in UMTS use two or more carriers to simultaneously communicate with user equipment, or two or two in LTE. The above carrier simultaneously maintains communication with the user equipment. However, in an actual network, due to the limitation of the number of carrier frequencies, some mobile operators do not have enough frequencies to deploy multiple UMTS and LTE systems at the same time, and the mobile operator adjusts the carrier frequency of UMTS and LTE according to the number of user equipments accessing the network. Since the UMTS system and the LTE system coexist for a long time, when the capacity of a single system (the carrier frequency limitation) is insufficient to provide a high transmission rate, different system joint transmission schemes are usually adopted, which may also be called cross-system carrier aggregation. . 2 is a schematic diagram of joint transmission according to the related art. As shown in FIG. 2, the user equipment uses two access technologies simultaneously, and two wireless links are established for transmitting data, which can not only obtain higher throughput. Quantity, and can achieve better load balancing effect. Before the joint transmission scheme is adopted, the load balancing between the systems can only be implemented by the method of switching and redirection. If the joint transmission scheme is adopted, the network side can dynamically adjust each user equipment according to the load dynamics of different access systems. The transmission rate on different links can better achieve load balancing. If the user equipment adopts the joint transmission scheme, the data needs to be split and aggregated between the two systems, and the data is transmitted through the core network, but this will cause a large data delay. For a user equipment that does not use the joint transmission scheme, if the user equipment needs to implement handover between different access systems, the manner of switching through the core network may also cause a large delay in the handover process, and may even cause handover failure. SUMMARY OF THE INVENTION The present invention provides a data transmission method and system to solve at least the problem of data transmission between two access networks through a core network in the related art, thereby causing a large data delay. In order to achieve the above object, according to an aspect of the present invention, a data transfer method is provided. The data transmission method according to the present invention includes: an access network element of the first access network acquires address information of an access network element of the second access network; and an access network element of the first access network according to the address information And establishing an interface with the access network element of the second access network; the access network element of the first access network and the access network element of the second access network perform signaling and/or data transmission through the interface. Before the access network element of the first access network acquires the address information of the access network element of the second access network, the method further includes: the access network element of the first access network passes through the core network The access network element of the second access network sends an address information acquisition request. The address information obtaining request includes at least one of the following: an identifier of an access network element of the first access network, a location area identifier information of an access network element of the first access network, and an access network of the second access network. The identifier of the network element and the location area identifier information of the access network element of the second access network. The address information acquisition request is a radio access network information management RIM information request data packet, where the RIM information request data packet includes an application layer identifier of the newly added address information. The access network element of the first access network and the access network element of the second access network each include one of the following: a base station of a long term evolution system, a radio network controller of a universal mobile communication system, and a universal mobile communication system. Base station, global mobile communication enhanced data rate Global mobile communication evolution technology base station controller of the radio access network system. The address information includes one of the following: an IP address of an access network element of the second access network; an IP address of the access network element of the second access network; and a port of the access network element of the second access network number. In order to achieve the above object, according to another aspect of the present invention, a data transfer system is provided. The data delivery system according to the present invention includes an access network element of the first access network and an access network element of the second access network, where the access network element of the first access network includes: an acquisition module, In order to obtain the address information of the access network element of the second access network, the establishing module is configured to establish an interface with the access network element of the second access network according to the address information; and the data transmission module is set to be the second The access network element of the access network performs signaling and/or data transmission through the interface. The access network element of the first access network further includes: a sending module, configured to send an address information obtaining request to the access network element of the second access network through the core network. The address information obtaining request includes at least one of the following: an identifier of an access network element of the first access network, a location area identifier information of an access network element of the first access network, and an access network of the second access network. The identifier of the network element and the location area identifier information of the access network element of the second access network. The address information acquisition request is a radio access network information management RIM information request data packet, where the RIM information request data packet includes an application layer identifier of the newly added address information. By establishing a direct interface across systems, the present invention not only reduces data latency, but also reduces latency across system handovers and reduces operator network maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of a 3GPP access system architecture according to the related art; FIG. 2 is a schematic diagram of joint transmission according to the related art; FIG. 3 is a flowchart of a data transfer method according to an embodiment of the present invention; Is an interaction flowchart according to a preferred embodiment of the present invention; FIG. 5 is an interaction flowchart according to a preferred embodiment 2 of the present invention; 6 is an interaction flowchart according to a preferred embodiment 3 of the present invention; and FIG. 7 is a structural block diagram of a data delivery system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. The embodiment of the present invention provides a data transfer method. FIG. 3 is a flowchart of a data transfer method according to an embodiment of the present invention. As shown in FIG. 3, the following steps S302 to S306 are included. Step S302: The access network element of the first access network acquires address information of the access network element of the second access network. Step S304, the access network element of the first access network establishes an interface with the access network element of the second access network according to the address information. Step S306, the access network element of the first access network and the access network element of the second access network perform signaling and/or data transmission through the interface. In the related art, two access networks transmit data through the core network, thereby causing a large data delay; switching between systems needs to be performed through the core network, which also causes a large handover delay. In the embodiment of the present invention, by establishing a direct interface across the system, data delay can be reduced, handover delay can be reduced, and network maintenance cost of the operator can be reduced. Preferably, before the access network element of the first access network acquires the address information of the access network element of the second access network, the method further includes: accessing the network element of the first access network through the core The network sends an address information acquisition request to the access network element of the second access network. Preferably, the address information obtaining request includes at least one of: an identifier of an access network network element of the first access network, a location area identifier information of an access network element of the first access network, and a second access network The identifier of the access network element and the location area identification information of the access network element of the second access network. Preferably, the address information acquisition request is a RIM information request data packet, wherein the RIM information request data packet includes an application layer identifier of the newly added address information. Preferably, the access network element of the first access network and the access network element of the second access network each comprise one of the following: a base station of the long term evolution system, a radio network controller of the universal mobile communication system, and a universal mobile Base of communication system Station, Global Mobile Telecommunications Enhanced Data Rate Global Mobile Telecommunications Evolution Technology Base Station Controller for Radio Access Network Systems. Preferably, the address information includes one of: an IP address of an access network element of the second access network; an IP address of the access network element of the second access network and an access network of the second access network The port number of the meta. It should be noted that the address information in the present invention refers to the transport layer address information (Transport Layer).

Address ). The implementation process of the embodiment of the present invention will be described in detail below with reference to examples. Preferred Embodiment 1 In the first preferred embodiment, an Iub interface exists between the RNC in the UMTS system and the base station (base station 1) under its jurisdiction, and the RNC learns the existence according to the measurement report of the user equipment in the cell (cell 1) under the control of the base station 1. Covering cells in the overlapping LTE system (Cell 2, the associated base station is the evolved base station 2). In order to achieve joint transmission, and the inter-system handover delay is shorter, the RNC decides to establish a direct interface with the base station 2, and the process of establishing a direct interface is as follows: FIG. 4 is an interaction flowchart according to a preferred embodiment of the present invention, as shown in FIG. The indication includes the following steps S401 to S407. In step S401, the RNC sends a request for obtaining information to the core network element SGSN, where the request includes the identifier of the base station 2, the Tracking Area Code (TAC) of the cell 2, and the IP address information to be acquired. In order to facilitate the return of the information by the base station 2, the identifier of the RNC and the location area identifier LAI (Location Area Identifier) where the RNC is located are also included in the request for obtaining information. Step S402: After receiving the request for obtaining information, the SGSN sends the request to the MME through the S3 interface according to the tracking area identifier TAC. Step S403, after receiving the request for obtaining information, the MME sends the request to the base station 2 according to the identity of the base station therein. Step S404, after receiving the request for obtaining information, the base station 2 knows that the RNC wants to establish a direct interface with the RNC, and the base station 2 needs to send its own IP address to the RNC. Therefore, the base station 2 carries its own IP address in the response to the information, and then sends the IP address to the MME. Obtain an information response, which also contains the identity of the RNC and its LAI. Step S405: After receiving the response to the acquisition information, the MME sends an acquisition information response to the SGSN. Step S406: After receiving the response information, the SGSN sends a response information response to the RNC. Step S407, after receiving the response information, the RNC obtains the IP address of the base station 2. The RNC can establish a direct interface with the base station 2 through IP transmission. The RNC can send a direct interface setup request to the base station 2, requesting the base station 2 to establish a direct interface with it. If the base station 2 accepts the request, the RNC establishes a direct interface with the base station 2. Through the direct interface, the RNC and the base station 2 can perform joint transmission on some user equipments; through the direct interface, the delay of the cross-system switching between the RNC and the user equipment in the base station 2 is greatly reduced, and the data transmission rate caused by the cross-system handover is also suddenly dropped. Significant changes will be made, and the shortening of the switching delay will increase the success rate of the handover. With the direct interface, the RNC and the base station 2 can directly exchange load information, and the delay is reduced; and other information of the cell under the jurisdiction is exchanged. Through the method of the present invention, the RNC and the base station 2 automatically obtain the IP address used by the other party to establish a direct interface through the core network, thereby realizing the automation of the interface establishment. In this embodiment, the IP address of the other party is obtained in the manner of the request. In this embodiment, the direct interface is established by directly transmitting the IP address to the other party. The specific method is in the request signaling sent by the RNC to the SGSN in step S401. The identifier of the RNC and the IP address of the RNC are included, and the identifier and the TAC of the base station 2 are included. After the base station 2 receives the IP address of the RNC after being forwarded through the core network, the base station 2 determines whether to establish a direct interface with the RNC. The interface, the base station 2 directly sends a direct interface setup request to the RNC through the IP transmission, so that the direct interface can be established faster. The preferred embodiment 1 describes a scenario in which a direct interface is established between the UMTS and the LTE system. In fact, the same applies to the UMTS and the GERAN system. Since the UMTS and the GERAN system can share the same SGSN, the RNC can access the GERAN system through the shared SGSN. After the base station (or the base station controller BSC) sends the acquisition information request and obtains the IP address of the base station (or the base station controller), the establishment process of the direct interface can be initiated. If the SGSN to which the RNC is connected in the UMTS system is different from the SGSN to which the BSC in the GERAN system is connected, the signaling for obtaining the information request needs to pass through the two SGSNs. Preferred Embodiment 2 In the existing protocol, a radio access network information management (Radio Access Network Information Management, RIM for short) process may be used to obtain cell radio access network information between different systems. In the RIM process, a network element that initiates information acquisition of radio access network information of other systems is called a Controlling Base System (Controlling BSS), and a network element that provides radio access network information is called a Serving BSS, and controls the base station system and The serving base station system needs to support the Base Station Subsystem GPRS Protocol (BSSGP). The control base station system sends a RIM Information Request PDU to the serving base station system through the core network, where the request PDU includes a RIM Container and RIM Routing Information. In the RIM container, it contains the RIM Application Identity (Application Application) and the RIM Sequence Number. The RIM application layer identifier contains the need to obtain cell wireless access. The network information content is SON Transfer, System Information^ MBMS data channel, etc. (the information content of the cell needs to be acquired), where SON Transfer refers to the information including the cell load report (Cell Load Reporting); and the application layer container contains the cell to be acquired. The identifier or the cell identifier that needs to be reported or the cell identifier called Reporting Cell Identifier (Reporting here means that Serving BSS returns to Controlling BSS). The RIM routing information includes a source cell identifier (Source Cell Identifier) and a target cell identifier (Destination Cell Identifier). It should be noted that if it is a BSS in the GERAN system, the source or target cell identifier (Source Cell Identifier or Destination Cell Identifier) is the identifier of the cell under the jurisdiction of the BSS; if it is the RNC in the UMTS system, the source or target The identifier of the cell (Source Cell Identifier or Destination Cell Identifier) refers to the identifier of the RNC; if it is e B in the LTE system, the source or destination cell identifier (Source Cell Identifier or Destination Cell Identifier) is the e B identifier in LTE ( This does not refer to the identity of the cell under the jurisdiction of e B). The existing protocol uniformly uses the identity of the source cell and the identity of the target cell when defining the routing information because the cell is used for routing in the GERAN system. After the introduction of the UMTS system and the LTE system, the routing information is different (in the UMTS system). In the LTE, the route is identified by the RNC; in LTE, the eNB is used to identify the route, and the meanings of the source cell identifier (Source Cell Identifier) and the target cell identifier (Destination Cell Identifier) are changed. 5 is an interaction flowchart according to a preferred embodiment of the present invention. As shown in FIG. 5, the preferred embodiment extends the application of the existing RIM process to enable it to acquire the IP address of the different system serving base station system, so that different systems are available. Establish a direct interface between them and implement IP address acquisition through the RIM process. Step S501, the base station system is controlled to send a RIM information request packet to the core network (RIM Information).

Request PDU), the newly added RIM application layer identifier is included in the request PDU, and the newly added RIM application layer identifier refers to IP address information (or Transport Layer Address). Similar to the existing RIM process, the RIM information request packet also includes RIM routing information: Source Cell Identifier and Destination Cell Identifier. Here, the control base station system may be a base station controller in the GERAN system, or in a UMTS system.

RNC, or a base station in an LTE system. The object of the RIM information request packet transmission (ie, the serving base station system) is a base station controller (in the GERAN system) or an RNC0JMTS system in the different system; or a base station (in the LTE system). Step S502: After receiving the data packet requested by the RIM information, the core network sends the data packet requested by the RIM information to the serving base station system by using the routing information contained therein. Step S503: After receiving the data packet requested by the RIM information, the serving base station system generates a radio access network information packet (RAN INFORMATION PDU), where the IP address (or transport layer address) of the serving base station system is included. The serving base station system transmits a radio access network information packet to the core network. Step S504, the core network forwards the data packet to the control base station system according to the routing information included in the radio access network information data packet. Step S505, the control base station system obtains the IP address of the serving base station system by parsing the received radio access network information data packet, and can initiate a direct interface establishment request to the serving base station system by using the IP transmission, thereby realizing the purpose of establishing the direct interface. In this embodiment, the control base station system can obtain the IP address of the serving base station system, for example, the RNC can acquire the IP address of the base station in the LTE system, or the base station in the LTE can acquire the IP address of the RNC, and then the RNC and the base station in the LTE system A direct interface can be established. After the HSPA (High Speed Packet Access) technology is introduced in the UMTS system, if the user equipment is configured to use the HSPA technology, the network node that schedules the user equipment is the base station (the base station to which the user equipment accesses the cell), in order to achieve cross-system Joint transmission requires a base station in the UMTS system and a base station in the LTE system (or a base station controller in the GERAN system) to establish a direct interface. At this time, the RIM process can still be used to establish the direct interface. For example, the base station in the LTE system sends the RIM information request data packet to the RNC through the core network, and the data packet includes the existing RIM routing information and the newly added RIM application layer. The identifier (IP address information) further includes a cell identifier for requesting reporting, where the cell identifier requested to be reported refers to the identifier of the cell managed by the base station managed by the RNC; the RNC receives the data packet requested by the RIM information, and returns the data packet to the base station in the LTE. The IP address of the base station to which the cell to be reported belongs. After the base station in the LTE system obtains the IP address of the base station in the UMTS system, a direct interface can be established. Through the direct interface, the delay of the user equipment for cross-system switching is greatly reduced, and the data transmission rate drop caused by the cross-system switching will also be significantly improved, and the shortening of the switching delay can improve the success rate of the handover. Preferred Embodiment 3 In the preferred embodiment 3, in the UMTS system, the cell managed by the base station B1 under the RNC and the cell under the base e b in the LTE system have overlapping coverage areas, so it is desirable to establish a direct interface between the two base stations. So that the two systems can implement joint transmission to the user equipment. Because of the HSPA technology in the UMTS system, the network node implementing the scheduling is a base station (e.g., B1), so a direct connection between the base stations of the two systems is required. FIG. 6 is an interaction flowchart according to a preferred embodiment 3 of the present invention. As shown in FIG. 6, the following steps S601 to S605 are included. Step S601, e Bl sends a request for acquiring an address information to the core network, where the identifier of the RNC is included in the request, and the location area identifier LAL where the RNC is located further includes the identifier of B1 or the identifier of the cell under the jurisdiction of B1. In order to facilitate the RNC to return information, the identifier of the eNB 1 and the tracking area identifier TAC where the eNB 1 is located are also included in the request for obtaining the address information. Step S602: After receiving the request for obtaining the address information, the core network sends the request to the RNC according to the routing information. Step S603, after receiving the request for obtaining the address information, the RNC may send the acquisition address information to obtain the address information by requesting the acquisition of the address information from the B1, and then return the response to the core network to obtain the address information response; if the RNC has already learned the address of the B1, Information, you can immediately return to get the address information response. In this response, the IP address and port number of B1 are included. The response also includes the identity of eNB1 and the TAC in which it is located. Step S604: After receiving the response to obtain the address information, the core network sends the response signaling to the eNB1. Step S605, after receiving the address information response, the eNB1 obtains the IP address information and the port number of the B1, and can initiate an interface establishment request directly to the NB1 through the IP transmission, so as to establish an interface for joint transmission. The preferred embodiment describes the process of obtaining the address information initiated by the eNB. If the process of obtaining the address information by the B1 is similar to the above description, the only difference is that the B1 needs to send the address information request to the core network through the RNC. In the request, the identifier of the RNC and the location area identifier LAI where the RNC is located need to be included in order to obtain the address information response and can be routed back to the RNC. It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different than that herein. The embodiment of the invention provides a data delivery system, which can be used to implement the above data transmission method. FIG. 7 is a structural block diagram of a data delivery system according to an embodiment of the present invention. As shown in FIG. 7, an access network element 72 of a first access network and an access network element 74 of a second access network are included, where The access network element 72 of the first access network includes an acquisition module 722, an establishment module 724, and a data delivery module 726. The structure is described in detail below. The obtaining module 722 is configured to obtain the address information of the access network element of the second access network. The establishing module 724 is connected to the obtaining module 722, and is configured to obtain the address information acquired by the obtaining module 722, and the second access network. The access network element establishes an interface; the data delivery module 726 is coupled to the establishing module 724, and configured to perform signaling and/or data transmission with an interface established by the access network element of the second access network through the establishing module 724. Preferably, the access network element 72 of the first access network further includes: a sending module 728, configured to send an address information obtaining request to the access network element of the second access network through the core network. Preferably, the address information obtaining request includes at least one of: an identifier of an access network network element of the first access network, a location area identifier information of an access network element of the first access network, and a second access network The identifier of the access network element and the location area identification information of the access network element of the second access network. Preferably, the address information acquisition request is a RIM information request data packet, wherein the RIM information request data packet includes an application layer identifier of the newly added address information. It should be noted that the data delivery system described in the device embodiment corresponds to the foregoing method embodiment, and the specific implementation process has been described in detail in the method embodiment, and details are not described herein again. In summary, according to the above embodiments of the present invention, a data transfer method and system are provided. By establishing a direct interface across systems, the present invention can reduce data latency and reduce operator network maintenance costs. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A method of data transfer, comprising:

The access network element of the first access network acquires the address information of the access network element of the second access network; the access network element of the first access network according to the address information, and the An access network element of the second access network establishes an interface;

The access network element of the first access network and the access network element of the second access network perform signaling and/or data transmission through the interface.

The method according to claim 1, wherein, before the access network element of the first access network acquires the address information of the access network element of the second access network, the method further includes: The access network element of the first access network sends an address information acquisition request to the access network element of the second access network through the core network.

3. The method of claim 2, wherein the address information acquisition request comprises at least one of:

The identifier of the access network element of the first access network, the location area identifier information of the access network element of the first access network, and the identifier of the access network element of the second access network And location area identifier information of the access network element of the second access network.

The method according to claim 2, wherein the address information acquisition request is a radio access network information management RIM information request data packet, wherein the RIM information request data packet includes an application layer identifier of the newly added address information.

The method according to any one of claims 1 to 4, wherein the access network element of the first access network and the access network element of the second access network both include the following One:

A base station of a long term evolution system, a radio network controller of a universal mobile communication system, a base station of a universal mobile communication system, and a base station controller of a global mobile communication enhanced data rate global mobile communication evolution technology radio access network system.

The method according to any one of claims 1 to 4, wherein the address information comprises one of the following:

An IP address of the access network element of the second access network;

The IP address of the access network element of the second access network and the port number of the access network element of the second access network.

A data delivery system, comprising: an access network element of a first access network and an access network element of a second access network, wherein the access network element of the first access network comprises:

The obtaining module is configured to obtain the address information of the access network element of the second access network, and the establishing module is configured to establish an interface with the access network element of the second access network according to the address information;

And a data delivery module, configured to perform signaling and/or data transmission with the access network element of the second access network through the interface.

The system according to claim 7, wherein the access network element of the first access network further comprises: a sending module, configured to access the access network of the second access network through the core network The meta sends an address information acquisition request.

9. The system of claim 8, wherein the address information acquisition request comprises at least one of:

10. The system according to claim 8, wherein the address information acquisition request is a radio access network information management RIM information request data packet, wherein the RIM information request data packet includes an application layer identifier of the newly added address information.