CN102149213A - Relaying transmission method based on GTP (GPRS Tunneling Protocol) protocol and system thereof - Google Patents
Relaying transmission method based on GTP (GPRS Tunneling Protocol) protocol and system thereof Download PDFInfo
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Abstract
The invention discloses a relaying transmission method based on a GTP (GPRS Tunneling Protocol) protocol. GTP-C-plane signaling data and GTP-U-plane service data are separately transmitted by using a signaling replaying mode. The invention also discloses a transmission replaying system based on a GTP protocol, which is used for realizing the method. The system comprises a service supporting node (SGSN), a gateway supporting node (GGSN) and a relay supporting node (RGSN), wherein the RGSN is connected between the SGSN and the GGSN, and provided with a signaling analyzing and forwarding unit and a relay managing unit. In the invention, the GTP-C-plane signaling data is transmitted between the SGSN and the GGSN by the RGSN while the GTP-U-plane service data is directly transmitted between the SGSN (or RNC (Radio Network Controller)) and the GGSN without using the RGSN, thereby separately transmitting the GTP-C-plane signaling data and the GTP-U-plane service data to effectively solve network bottleneck problems and increase transmission service quality.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to a kind of relay transmission method and system thereof based on the GTP agreement.
Background technology
GTP (GPRS Tunnelling Protocol, GPRS Tunnel Protocol) is one group of IP-based, as to be used for supporting at GSM and UMTS network general packet radio service (GPRS) communications protocol.At mobile communications network, wireless access network is linked into core net by GPRS serving GPRS support node SGSN, SGSN connects with the establishment that GGSN GGSN carries out GTP tunnel by the GTP agreement then, realizes that portable terminal is linked into the function of outer data network.Communication system such as GPRS, WCDMA and CDMA 2000 for example.
With GPRS is example, as shown in Figure 1, wherein serving GPRS support node SGSN and gateway support node GGSN are the key equipments of GPRS communication system core network, the two all comprises the session management Core Feature, be responsible for when terminal or network initiation packet data context PDP activate request, carry out the management function such as foundation, renewal and dismounting of GTP tunnel and the forwarding capability of business datum.According to the 3GPP standard, the GTP agreement has been formulated the regulation that conversation management functional is realized, GTP tunnel comprises signaling plane (GTP-C) and user's face (GTP-U) specifically.Management roles such as the foundation of GTP-C charge tunnel, dismounting; GTP-U is responsible in the protocol encapsulation/decapsulation of the enterprising industry affair in the tunnel of having set up packet and bag forwarding task.The 3GPP standard also further the regulation, as shown in Figure 2, in 3G network radio network controller (RNC) directly tunnel style on user's face, directly be connected with GGSN.
In the mobile communication network structure of prior art, SGSN logically is directly to link to each other with GGSN, to realize the foundation and the data forwarding of GTP tunnel.And this direct connected mode has limited the flexibility of GTP professional ability, and one of solution of being taked is to adopt GTP agreement trunking scheme.
At present, the common GTP agreement trunking scheme that adopts, as shown in Figure 3, relaying support node RGSN is connected respectively with GGSN with SGSN by gn interface, thereby realizes the forwarding of packet on GTP-C and the GTP-U face.The agreement flow process is as shown in Figure 4, and is specific as follows:
101, by the dns resolution result, SGSN initiates the PDP Context request to create to RGSN;
102, RGSN searches relay purposes GGSN, transmits the PDP Context request to create to relay purposes GGSN then;
103, GGSN sends PDP Context to RGSN and creates acceptance response;
104, RGSN transmits PDP Context to SGSN and creates acceptance response;
105, create response message according to PDP Context, if be success response, then SGSN and RGSN have set up the GTP-C/U tunnel, carry out data and transmit;
106, create response message according to PDP Context, if be success response, then RGSN and GGSN have set up the GTP-C/U tunnel, carry out the data relaying and transmit transmission;
107, finish data and transmit, SGSN initiates the PDP Context removal request to RGSN;
108, RGSN transmits the PDP Context removal request to GGSN;
109, GGSN sends PDP Context deletion acceptance response to RGSN;
110, RGSN transmits PDP Context deletion acceptance response to SGSN.
Above-mentioned trunking scheme is called with the road relaying.Should exist following technological deficiency with the road trunking scheme::
(1) GTP-C face and GTP-U surface current amount all will be passed through relaying support node RGSN, and relaying support node RGSN need carry out the state-maintenance in tunnel.
(2) GTP-C face and GTP-U surface current amount all will be passed through via node, and relaying support node RGSN needs powerful processing data packets ability, thereby becomes new network bottleneck.
(3) GTP-U surface current amount has increased transfer delay, has reduced quality of service through relaying support node RGSN.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of relay transmission method based on GTP agreement, employing signaling trunking scheme is provided, with realization GTP-C plane signaling data are separated transmission with GTP-U face business datum, thereby effectively solve the network bottleneck problem, improve the transport service quality.Another object of the present invention is to provide the relay transmission system that realizes said method based on the GTP agreement.
Purpose of the present invention is achieved by the following technical programs:
A kind of relay transmission method based on the GTP agreement provided by the invention may further comprise the steps:
A) by the dns resolution result, serving GPRS support node SGSN initiates the PDP Context request to create to relaying support node RGSN;
B) RGSN receives described PDP Context request to create signaling, according to the requirement of setting up of transparent relay logic and GTP-U endpoint of a tunnel, revises the protocol fields parameter value in the described request to create signaling and generates new PDP Context request to create signaling; Search relay purposes gateway support node GGSN then, transmit new PDP Context request to create signaling to described relay purposes gateway support node GGSN;
C) relay purposes GGSN sends PDP Context and creates the acceptance response signaling, requires to transmit to SGSN according to transparent relay logic and signaling relaying through RGSN;
D) SGSN receives the PDP Context that RGSN sends and creates the acceptance response signaling, preserve the tunnel and set up relevant information, according to signaling parameter with GGSN as the GTP-U endpoint of a tunnel;
E) SGSN and GGSN be according to Signalling exchange information, between directly set up the GTP-U tunnel, carry out business datum and pass on; Under direct tunnel style, directly set up the GTP-U tunnel between RNC and the GGSN;
F) business datum transmits and finishes, and carries out the PDP Context deletion and handles.
The present invention sets up in the process the tunnel, and relaying support node RGSN requires to generate new PDP Context request to create signaling according to the foundation of GTP-U endpoint of a tunnel.SGSN receives by GGSN and sends the PDP Context establishment acceptance response signaling of transmitting through RGSN, with GGSN as the GTP-U endpoint of a tunnel, make SGSN/RNC and GGSN directly set up the GTP-U tunnel, carry out that data are passed on and, thereby realize purpose that GTP-C plane signaling data and GTP-U face business datum are separated transmission without relaying support node RGSN.
The PDP Context that RGSN sends for GGSN in the step c) of the present invention is created the acceptance response signaling, can take two kinds of mode processing forward, and the PDP Context deletion in this moment described step f) handles with it that correspondence has two kinds of processing modes.Specific as follows:
Mode one:
RGSN revises the protocol fields parameter value in the establishment acceptance response signaling that GGSN sends and generates new PDP Context and create the acceptance response signaling in the described step c), transmits to SGSN then;
PDP Context deletion treatment step is as follows in the described step f):
F1-1) SGSN initiates the PDP Context removal request according to the tunnel information of preserving to RGSN;
F1-2) RGSN receives PDP Context removal request signaling, transmits PDP Context removal request signaling to relay purposes GGSN;
F1-3) RGSN receives the PDP Context deletion acceptance response signaling that GGSN sends, and transmits to SGSN;
F1-4) SGSN receives PDP Context deletion acceptance response signaling, carries out subsequent treatment.
In this way, PDP Context request to create/response signaling and PDP Context removal request/response signaling all pass through relay process and the forwarding of RGSN.
Mode two:
RGSN directly transmits the establishment acceptance response signaling that GGSN sends in the described step c) to SGSN;
The PDP Context deletion treatment step of described step f) is as follows:
F2-1) SGSN directly initiates the PDP Context removal request to GGSN according to the tunnel information of preserving;
F2-2) SGSN receives the PDP Context deletion acceptance response signaling that GGSN sends, and carries out subsequent treatment.
In this way, only PDP Context request to create/response signaling is through relay process and the forwarding of RGSN, and other signalings directly transmit between SGSN and GGSN without the relaying of RGSN.
In addition, the present invention can take following further measure: " SGSN Address for signalling " the field parameter value in the PDP Context request to create signaling that RGSN record SGSN sends in the described step b) and the source IP address of signaling data bag are replaced by described " SGSN Address for signalling " field parameter value the IP address of RGSN and generate new PDP Context request to create signaling then.
When taking aforesaid way for the moment, " GGSN Address for Control Plane " field parameter value that the PDP Context that RGSN sends GGSN in the described step c) is created in the acceptance response signaling is replaced by the IP address of RGSN and generates new PDP Context establishment acceptance response signaling.
To the direct tunnel of 3G network situation, radio network controller (RNC) can directly be set up the GTP-U tunnel with gateway support node GGSN, without relaying support node RGSN.
Another object of the present invention is achieved by the following technical programs:
A kind of relay transmission system based on the GTP agreement provided by the invention comprises serving GPRS support node SGSN, gateway support node GGSN and relaying support node RGSN, and described relaying support node RGSN is connected between SGSN and the GGSN; Described relaying support node RGSN has following functional module:
Signaling is resolved and retransmission unit, be used for the GTP protocol signaling that is received is resolved, and, the signaling that is received is made amendment and generate new GTP protocol signaling and transmit according to the requirement of relay management unit and protocol fields that is provided or protocol fields parameter value;
The relay management unit is used to preserve the relaying session information after signaling is resolved, according to the requirement of signaling trunking scheme, and the needed protocol fields of GTP protocol signaling packet or the protocol fields parameter value that provide desire to transmit.
The present invention has following beneficial effect:
The present invention adopts the mode of signaling relaying, GTP-C plane signaling data are separated transmission with GTP-U face business datum, GTP-C plane signaling data transmit between SGSN and GGSN through relaying support node RGSN, and GTP-U face business datum directly transmits between SGSN (or RNC) and GGSN, without relaying support node RGSN, thereby efficiently solve the network bottleneck problem, improved the transport service quality.
Description of drawings
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing:
Fig. 1 is a prior art GPRS communication system network structural principle schematic diagram;
Fig. 2 is a prior art 3G network tunnel style network configuration principle schematic;
Fig. 3 is that prior art GTP agreement is with road trunking scheme network configuration principle schematic;
Fig. 4 is that prior art GTP agreement is with road trunking scheme signaling process figure;
Fig. 5 is the structural principle block diagram of the embodiment of the invention based on GTP agreement relay transmission system;
Fig. 6 is a GTP protocol signaling trunking scheme network configuration principle schematic embodiment illustrated in fig. 5;
Fig. 7 is the signaling process figure of one of Fig. 5, relay transmission mode embodiment illustrated in fig. 6;
Fig. 8 is two signaling process figure of Fig. 5, relay transmission mode embodiment illustrated in fig. 6.
Embodiment
Fig. 5～Figure 8 shows that embodiments of the invention.As shown in Figure 5, present embodiment comprises serving GPRS support node SGSN, gateway support node GGSN and relaying support node RGSN based on the relay transmission system of GTP agreement, and relaying support node RGSN is connected between SGSN and the GGSN.Relaying support node RGSN has following functional module:
Signaling is resolved and retransmission unit 1, be used for the GTP protocol signaling that is received is resolved, and, the signaling that is received is made amendment and generate new GTP protocol signaling and transmit according to the requirement of relay management unit 2 and protocol fields that is provided or protocol fields parameter value;
Setting up in the process of tunnel, relaying support node RGSN resolves and retransmission unit 1 by its signaling, the GTP agreement GTP-C signaling that is received is resolved, generate new PDP Context request to create signaling and new PDP Context establishment acceptance response signaling according to the foundation requirement of GTP-U endpoint of a tunnel and the requirement of relay management unit 2.SGSN receives new PDP Context and creates the acceptance response signaling, as shown in Figure 6, with GGSN as the GTP-U endpoint of a tunnel, make SGSN and GGSN directly set up the GTP-U tunnel, carry out that data are passed on and, thereby realize purpose that GTP-C plane signaling data and GTP-U face business datum are separated transmission without relaying support node RGSN.
To the direct tunnel of 3G network situation, as shown in Figure 6, radio network controller (RNC) can directly be set up the GTP-U tunnel with gateway support node GGSN, without relaying support node RGSN.
Adopting above-mentioned relay transmission system to carry out transmission manner has following two kinds, and the selection of its mode can be provided by the relay management unit 2 of relaying support node RGSN.
Mode one, as shown in Figure 7, its relaying transmission method step is as follows:
201, by the dns resolution result, SGSN initiates the PDP Context request to create to RGSN;
202, RGSN receives PDP Context request to create signaling, write down " SGSNAddress for signalling " the field parameter value in this demand signalling and the source IP address of signaling data bag, the requirement of setting up according to transparent relay logic and GTP-U endpoint of a tunnel is replaced by " SGSN Address for signalling " field parameter value the IP address of RGSN and generates new PDP Context request to create signaling; Search relay purposes GGSN then, transmit new PDP Context request to create signaling to relay purposes GGSN;
203, RGSN receives the PDP Context establishment acceptance response signaling that GGSN sends, according to transparent relay logic and the requirement of signaling relaying, " GGSN Address for Control Plane " the field parameter value in this acceptance response signaling is replaced by the IP address of RGSN and generates that new PDP Context is created the acceptance response signaling and transmit to SGSN;
204, SGSN receives new PDP Context and creates the acceptance response signaling, preserve the tunnel and set up relevant information, according to signaling parameter with GGSN as the GTP-U endpoint of a tunnel;
205, SGSN and GGSN be according to Signalling exchange information, between directly set up the GTP-U tunnel, carry out business datum and pass on;
206, business datum transmits and finishes, and SGSN initiates the PDP Context removal request according to the tunnel information of preserving to RGSN;
207, RGSN receives PDP Context removal request signaling, transmits PDP Context removal request signaling to relay purposes GGSN;
208, RGSN receives the PDP Context deletion acceptance response signaling that GGSN sends, and transmits to SGSN;
209, SGSN receives PDP Context deletion acceptance response signaling, carries out subsequent treatment.
Mode two, as shown in Figure 8, its relaying transmission method step is as follows:
301, by the dns resolution result, SGSN initiates the PDP Context request to create to RGSN;
302, RGSN receives PDP Context request to create signaling, write down " SGSNAddress for signalling " the field parameter value in this demand signalling and the source IP address of signaling data bag, the requirement of setting up according to transparent relay logic and GTP-U endpoint of a tunnel is replaced by " SGSN Address for signalling " field parameter value the IP address of RGSN and generates new PDP Context request to create signaling; Search relay purposes GGSN then, transmit new PDP Context request to create signaling to relay purposes GGSN;
303, RGSN receives the PDP Context establishment acceptance response signaling that GGSN sends, and according to transparent relay logic and the requirement of signaling relaying, directly transmits this acceptance response signaling;
304, SGSN receives new PDP Context and creates the acceptance response signaling, preserve the tunnel and set up relevant information, according to signaling parameter with GGSN as the GTP-U endpoint of a tunnel;
305, SGSN and GGSN be according to Signalling exchange information, between directly set up the GTP-U tunnel, carry out business datum and pass on;
306, SGSN directly initiates the PDP Context removal request to GGSN according to the tunnel information of preserving;
307, SGSN receives the PDP Context deletion acceptance response signaling that GGSN sends, and carries out subsequent treatment.
Claims (6)
1. relay transmission method based on the GTP agreement is characterized in that may further comprise the steps:
A) by the dns resolution result, serving GPRS support node SGSN initiates the PDP Context request to create to relaying support node RGSN;
B) RGSN receives described PDP Context request to create signaling, according to the requirement of setting up of transparent relay logic and GTP-U endpoint of a tunnel, revises the protocol fields parameter value in the described request to create signaling and generates new PDP Context request to create signaling; Search relay purposes gateway support node GGSN then, transmit new PDP Context request to create signaling to described relay purposes gateway support node GGSN;
C) relay purposes GGSN sends PDP Context and creates the acceptance response signaling, requires to transmit to SGSN according to transparent relay logic and signaling relaying through RGSN;
D) SGSN receives the PDP Context that RGSN sends and creates the acceptance response signaling, preserve the tunnel and set up relevant information, according to signaling parameter with GGSN as the GTP-U endpoint of a tunnel;
E) SGSN and GGSN be according to Signalling exchange information, between directly set up the GTP-U tunnel, carry out business datum and pass on; Under direct tunnel style, directly set up the GTP-U tunnel between RNC and the GGSN;
F) business datum transmits and finishes, and carries out the PDP Context deletion and handles.
2. the relay transmission method based on the GTP agreement according to claim 1 is characterized in that:
RGSN revises the protocol fields parameter value in the establishment acceptance response signaling that GGSN sends and generates new PDP Context and create the acceptance response signaling in the described step c), transmits to SGSN then;
PDP Context deletion treatment step is as follows in the described step f):
F1-1) SGSN initiates the PDP Context removal request according to the tunnel information of preserving to RGSN;
F1-2) RGSN receives PDP Context removal request signaling, transmits PDP Context removal request signaling to relay purposes GGSN;
F1-3) RGSN receives the PDP Context deletion acceptance response signaling that GGSN sends, and transmits to SGSN;
F1-4) SGSN receives PDP Context deletion acceptance response signaling, carries out subsequent treatment.
3. the relay transmission method based on the GTP agreement according to claim 1 is characterized in that:
RGSN directly transmits the establishment acceptance response signaling that GGSN sends in the described step c) to SGSN;
The PDP Context deletion treatment step of described step f) is as follows:
F2-1) SGSN directly initiates the PDP Context removal request to GGSN according to the tunnel information of preserving;
F2-2) SGSN receives the PDP Context deletion acceptance response signaling that GGSN sends, and carries out subsequent treatment.
4. the relay transmission method based on the GTP agreement according to claim 1, it is characterized in that: " SGSN Addressfor signalling " the field parameter value in the PDP Context request to create signaling that RGSN record SGSN sends in the described step b) and the source IP address of signaling data bag are replaced by described " SGSNAddress for signalling " field parameter value the IP address of RGSN and generate new PDP Context request to create signaling then.
5. the relay transmission method based on the GTP agreement according to claim 2 is characterized in that: " GGSNAddress for Control Plane " field parameter value that the PDP Context that RGSN sends GGSN in the described step c) is created in the acceptance response signaling is replaced by the IP address of RGSN and generates new PDP Context establishment acceptance response signaling.
6. the relay transmission system based on the GTP agreement comprises serving GPRS support node SGSN, gateway support node GGSN and relaying support node RGSN, and described relaying support node RGSN is connected between SGSN and the GGSN; It is characterized in that: described relaying support node RGSN has following functional module:
Signaling is resolved and retransmission unit (1), be used for the GTP protocol signaling that is received is resolved, and, the signaling that is received is made amendment and generate new GTP protocol signaling and transmit according to requirement and the protocol fields that is provided or the protocol fields parameter value of relay management unit (2);
Relay management unit (2) is used to preserve the relaying session information after signaling is resolved, and according to the requirement of signaling trunking scheme, the needed protocol fields of GTP protocol signaling packet or the protocol fields parameter value that provide desire to transmit provide the selection relay transmission mode.
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Cited By (2)
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| CN104869668A (en) * | 2015-02-13 | 2015-08-26 | 北京集奥聚合科技有限公司 | Method for access platform to support GTP signaling |
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| US7246176B2 (en) * | 2002-04-30 | 2007-07-17 | Nortel Networks Limited | PDP context distribution among multiple GGSNs |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103931149A (en) * | 2011-08-29 | 2014-07-16 | 瑞典爱立信有限公司 | Implementing a 3g packet core in a cloud computer with openflow data and control planes |
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| CN104869668B (en) * | 2015-02-13 | 2018-05-29 | 北京集奥聚合科技有限公司 | Method for access platform to support GTP signaling |
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