CN101562582A - New VOIP framework in wireless access system - Google Patents
New VOIP framework in wireless access system Download PDFInfo
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- CN101562582A CN101562582A CNA2008101041592A CN200810104159A CN101562582A CN 101562582 A CN101562582 A CN 101562582A CN A2008101041592 A CNA2008101041592 A CN A2008101041592A CN 200810104159 A CN200810104159 A CN 200810104159A CN 101562582 A CN101562582 A CN 101562582A
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Abstract
The invention provides a novel integral VOIP framework which has high efficiency and is suitable for a wireless access system. Firstly, an access network of the VOIP framework is connected with a fixed network soft switch by adopting a standard SIP/RTP interface to ensure the simplicity of interconnection between networks, and the novel integral VOIP framework has the advantages of a common VOIP in the aspect of core networks. The mobile management of the network using the new integral VOIP framework is completed in the access network by introducing a service access gateway and a wireless ascription location register which are matched with user identifiers, and thus, the complete mobile application scene can be supported conveniently. In the aspect of media transmission, the novel integral VOIP framework improves the utilization ratio of an air interface and wireless Backhaul bandwidth resources and achieves the high-efficiency transmission of user data by adopting a RTP agent technology at a base station and a data multiplex technology between the base station and the service access gateway.
Description
Technical field
The present invention proposes the complete VOIP framework that a kind of novel and efficient is applicable to wireless access system.
Background technology
The VOIP technology significantly strengthens the speech network performance, because voice-and-data can use same IP-based packet network transmission, has greatly reduced the expense that core net is built simultaneously.
That adopts at present extensively has well solved the IP phone transmission in the cable network based on the VOIP framework of agreement and Session Initiation Protocol H.323.But the existing VOIP framework of use can cause the waste to interface-free resources and wireless Backhaul link in Radio Access Network.Reason is in existing radio data network, the VOIP voice packet eat dishes without rice or wine and wireless Backhaul all as application layer data with RTP/UDP/IP bag carrying, its middle wrapping head is longer, and media data is less relatively, causes efficiency of transmission not high.
In addition, all use the IP address as user ID when realizing VOIP in the existing wireless access system, under the situation of not using at present mobile IP technology, only support nomadic application scenarios, can not realize moving freely on a large scale.
Summary of the invention
The network element of this framework comprises: user terminal (UT), base station (BTS), service access gateway (SAG), wireless attaching position register (SHLR) and fixed network SoftSwitch (SS).Accompanying drawing 1 is the networking diagram of this framework.
The base station be responsible for providing and user terminal between air interface, and and service access gateway between interface.
Service access gateway belongs to access network equipment in this framework, be responsible for user data transparent transmission and voice user's authentication; Carry out protocol conversion, the realization Access Network is connected with flexible exchanging network; Be responsible for the mobile management function simultaneously, with user's mobility shielding in Access Network inside.
Wireless attaching position register SHLR also is an access network equipment, be responsible for storaging user data, user service information and part positional information, realize wireless user's mobile management with service access gateway,, simplified the core net realization to core net shielding user's mobility.The customer data base of SHLR and core net is independent, does not have interface between the two.
The fixed network SoftSwitch belongs to equipment of the core network, is responsible for and the interconnecting of network.The fixed network SoftSwitch is handled the user of native system as common sip terminal, adopt the standard Session Initiation Protocol to control standard Real-time Transport Protocol transmitting user data.Simultaneously, processing such as the charging during intercommunication, route is all finished by the fixed network soft switch.
The network model of this framework is divided into control and two planes of medium.
At control plane, in order to guarantee the normal realization of speech business, this framework is self-defined based on call state machine and the basic call flow process Q.931 stipulated, promptly wireless Backhaul interface call control protocol.The peer-entities of calling out control is positioned at terminal and service access gateway.The base station does not participate in calling out control, does not need to realize call state machine, as long as finish the foundation and the maintenance of relevant wireless transmission resources, and call signaling is directly got final product to terminal and the two-way transparent transmission of service access gateway.Service access gateway is mapped as the standard Session Initiation Protocol with wireless Backhaul interface protocol, and realization is connected with the fixed network SoftSwitch.
Mobile management flow process and message such as simultaneously, this framework is also self-defined subscription authentication and registration, position renewal and switching.Above-mentioned functions is cooperated by terminal, service access gateway and wireless attaching position register, finishes in Access Network inside.During specific implementation, service access gateway needs proxy user to registers kernel network, guarantee that the core net customer data base has enough information to provide service for user's incoming call/exhalation and other supplementary services, and need provide mechanism to guarantee the customer data base content synchronization of wireless attaching position register and core net.
In media plane, the present invention adopts wireless Backhaul data multiplex and RTP agent skill group to improve the efficiency of transmission of user data in network.
In Radio Access Network, interface-free resources is very valuable.This framework is the same with common VOIP, and external media data adopts the Real-time Transport Protocol carrying.If directly, can cause significant wastage to interface-free resources eating dishes without rice or wine to transmit the RTP bag.Efficient when this framework proposes a kind of RTP agent skill group with the interface transmission aloft of raising user data.The basic thought of RTP agent skill group is that the function with the RTP packetization/depacketization realizes in the base station, and data packets for transmission is original medium bag but not RTP/UDP/IP packet between terminal and base station.The speech data that is terminal transmits as loading on the Radio Link of air interface frame.The transmitting redundancy of frame few (not comprising long RTP/UDP/IP data packet head) because system eats dishes without rice or wine, the efficient height just can improve the utilance of bandwidth of air-interface resource greatly.
Wireless Backhaul between base station and the SAG adopts the DMUX data multiplexing technique to improve efficiency of transmission.Up link, the base station is multiplexed with RTP head encapsulation back with every 20ms compressed voice bag, squeezes into one or a spot of several UDP/IP bag back transmission; Down link, SAG also the multi-path voice of automatic network side cladding in the future with after, send to the base station again.
An important novel part of this framework is to support the user to switch in the conversation of whole network, promptly supports moving freely of user.According to the difference that realizes, the switching type of terminal is divided into switching two classes between inner switching of service access gateway and the service access gateway.The inner switching by service access gateway oneself of service access gateway handled, and handoff procedure is similar to common 2G/3G Radio Access Network.The switching of support terminal between service access gateway is a bright spot of this framework under the prerequisite of not changing existing SS.The prerequisite that realizes at first is that the user ID in this framework does not adopt the IP address, but adopts user identifier and interim application identities symbol.User identifier is user of unique identification in wireless access system, is user's permanent information.Interim application identities symbol is distributed by service access gateway in call establishment, and identifying user in the process of calling out carries out signaling and transmits, and regains behind the end of calling.Adopt this mode identifying user promptly can avoid complicated mobile IP problem, and realize the route of user message and data easily.In addition, introduce the notion of anchor service access gateway (AnchorSAG) in this framework, and designed the interface specification between the service access gateway.The anchor service access gateway refers to the service access gateway of the current registration of user, has wherein write down user's business datum.For the mobility to SS shielding user, in user's handoff procedure, SS gets in touch with the anchor service access gateway all the time.When the user switches, at first need to set up the RTP path between service business IAD and the anchor service access gateway, all business datums that mail to terminal or SS are all passed through this path and are transmitted.When switching, call out the state of control and safeguard between terminal and anchor service access gateway, the service business IAD is not preserved and is called out the relevant state information of control.
Fig. 1 has listed critical function and the key technology in this framework, and the equipment and the purpose of this technology of realization.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 1 is the critical function of native system framework and the explanation block diagram of key technology;
Fig. 2 is system group network figure;
Fig. 3 is the start-up logging flow chart;
Fig. 4 is calling procedure figure;
Fig. 5 arrives non-anchor service access gateway switching flow figure for the anchor service access gateway.
Embodiment
Referring to Fig. 2, provide a local network structure of using this framework among the figure, system comprises fixed network SoftSwitch 1, service access gateway 2, wireless attaching position register 3, base station 4 and user terminal 5.
Describe registration, caller and the switching flow of terminal in network respectively below in conjunction with accompanying drawing, further to define the working method of each network element in this framework.
Referring to Fig. 3, provided the signaling process that terminal is registered among the figure in network, wherein also comprised user's Access Network authentication process and core net SIP authentication process.
Referring to Fig. 4, provided the signaling process that terminal is initiated caller among the figure, authentication is the optional step in this process.
(illustrate: for the UT of support call authentication, and opened the calling authorization function on SAG, then SAG can initiate the conversation authentication to UT as required, if SAG does not have the authentication information of terminal or authentication group to use up, just carries out authentication process d-g.Otherwise do not carry out authentication process d-g.)
Step 36, SAG sends not with the INVITE of authentication information to SS, and session is set up in request.
Referring to Fig. 5, provided the signaling process that the terminal generation is switched to non-anchor service access gateway from the anchor service access gateway among the figure.
Claims (10)
1, VOIP framework in a kind of new wireless access system comprises following network element: user terminal, base station, service access gateway, wireless attaching position register and fixed network SoftSwitch is characterized in that this framework comprises following design:
A. the Access Network of this framework adopts the SIP/RTP interface of standard to be connected with the fixed network SoftSwitch;
B. service access gateway and wireless attaching position register are as access network equipment, in the inner mobile management that cooperates the user terminal of finishing this framework of Access Network;
C. at control plane, this framework adopts self-defining based on call state machine and the basic call flow process Q.931 stipulated, be wireless Backhaul interface call control protocol, the peer-entities of calling out control is positioned at user terminal and service access gateway, and the base station does not participate in calling out control;
D. in media plane, this framework is by the RTP agent skill group at place, base station, and the data multiplexing technique between base station and the service access gateway, improves the utilance of eating dishes without rice or wine with wireless Backhaul bandwidth resources.
2, VOIP framework according to claim 1 is characterized in that designing a, and the interface of described Access Network and fixed network SoftSwitch comprises that the user registers, calling and supplementary service flow process.
3, VOIP framework according to claim 1 is characterized in that designing a, and described fixed network SoftSwitch is handled the user terminal of this framework as common sip terminal, adopts the standard Session Initiation Protocol to control standard Real-time Transport Protocol transmitting user data.
4, VOIP framework according to claim 1 is characterized in that designing a, and processing such as the charging when described Access Network and the intercommunication of fixed network SoftSwitch, route are all finished by the fixed network SoftSwitch.
5, VOIP framework according to claim 1 is characterized in that designing b, and described service access gateway is responsible for user data transparent transmission and voice user's authentication; Carry out protocol conversion, the realization Access Network is connected with flexible exchanging network; Be responsible for the mobile management function simultaneously, with user's mobility shielding in Access Network inside.
6, VOIP framework according to claim 1 is characterized in that designing b, and described wireless attaching position register is responsible for storaging user data, user service information and part positional information; Realize wireless user's authentication and mobile management with service access gateway; The customer data base of wireless attaching position register and core net is independent, does not have interface between the two.
7, VOIP framework according to claim 1 is characterized in that designing b, and this framework also provides mechanism to guarantee the customer data base content synchronization of wireless attaching position register and core net.
8, VOIP framework according to claim 1, it is characterized in that designing b, when realizing mobile management, service access gateway needs proxy user to registers kernel network, and the customer data base of guaranteeing core net has enough information to provide service for user's incoming call/exhalation and other supplementary services.
9, VOIP framework according to claim 1 is characterized in that designing b, and finishing mobile management in Access Network inside is to realize by following method:
(1) with the service access gateway of the current registration of user as the anchor service access gateway, in the process that the user is switched between service access gateway, the fixed network SoftSwitch is got in touch with the anchor service access gateway all the time; When switching, at first set up the RTP path between service business IAD and the anchor service access gateway, all business datums that mail to user terminal or fixed network SoftSwitch are all passed through this path and are transmitted; When switching, call out the state of control and safeguard between user terminal and anchor service access gateway, the service business IAD is not preserved and is called out the relevant state information of control;
(2) adopt user identifier and interim application identities symbol rather than IP address to come identifying user, user identifier is user of unique identification in this framework; Interim application identities symbol is distributed by service access gateway in call establishment, and identifying user in the process of calling out carries out signaling and transmits, and regains behind the end of calling.
10, VOIP framework according to claim 1, it is characterized in that designing c, the base station does not participate in calling out control, do not need to realize call state machine, but the foundation of the wireless transmission resources of being responsible for being correlated with and maintenance, and with call control signalling directly to user terminal and the two-way transparent transmission of service access gateway.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102595510A (en) * | 2011-01-06 | 2012-07-18 | 鼎桥通信技术有限公司 | Message processing method and device |
CN103108298A (en) * | 2011-11-10 | 2013-05-15 | 北京信威通信技术股份有限公司 | Implementation method of whole-network calling in mobile communication system |
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US6658259B2 (en) * | 2002-03-07 | 2003-12-02 | Interwave Communications International, Ltd. | Wireless network having a virtual HLR and method of operating the same |
CN1284408C (en) * | 2004-03-15 | 2006-11-08 | 西安大唐电信有限公司 | Method of realizing mobile terminal authentication power and roaming through SCDMA network kernal net |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102595510A (en) * | 2011-01-06 | 2012-07-18 | 鼎桥通信技术有限公司 | Message processing method and device |
CN102595510B (en) * | 2011-01-06 | 2015-05-20 | 鼎桥通信技术有限公司 | Message processing method and device |
CN103108298A (en) * | 2011-11-10 | 2013-05-15 | 北京信威通信技术股份有限公司 | Implementation method of whole-network calling in mobile communication system |
CN103108298B (en) * | 2011-11-10 | 2016-03-23 | 北京信威通信技术股份有限公司 | The implementation method of the whole network calling in a kind of mobile communication system |
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