CN101146339B - SGSN-spanning switching method and mobile communication network - Google Patents
SGSN-spanning switching method and mobile communication network Download PDFInfo
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- CN101146339B CN101146339B CN200610153556XA CN200610153556A CN101146339B CN 101146339 B CN101146339 B CN 101146339B CN 200610153556X A CN200610153556X A CN 200610153556XA CN 200610153556 A CN200610153556 A CN 200610153556A CN 101146339 B CN101146339 B CN 101146339B
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Abstract
The invention relates to mobile communication field and discloses a cross-SGSN shift method and mobile communication network. In the invention, when the terminal conducts cross-SGSN shifting, the network side maintains the load between the former SGSN and GGSN, create a load between the former SGSN and target SGSN, and transmits business data package of the terminal via GGSN, the former SGSN and target SGSN. As the data package cached by the former SGSN for the terminal can be sent to the target SGSN via the newly created load and then sent by the target SGSN to the terminal, the loss of business data package can be reduced or avoided.
Description
Technical field
The present invention relates to moving communicating field, particularly the handoff technique of SGSN-spanning.
Background technology
GPRS (General Packet Radio Service, be called for short " GPRS ") be to go up a kind of new packet data bearers business that development is come out in existing global system for mobile communications (Global System for Mobile communication is called for short " GSM ").GPRS provides end to end, wireless IP connects.
GPRS to the transitional technology that 3G (Third Generation) Moblie develops, unites two into one mobile communication and data network as GSM, makes IP operation be introduced wide mobile market.The difference that GPRS and GSM are the most basic is, GSM is a kind of circuit switching system, and speed is per second 9.6Kbps, and GPRS adopts the mode of packet switching.
Gprs service will bring better service and bigger chance to user and operator: provide third generation business to carry out market development to the user, prolong the life cycle of GSM simultaneously.
GPRS possesses following main feature:
Provide from 9kbps to access rate to the user more than 171.2kbps.More effectively utilize Radio Resource, dynamically be coordinated in 1 to 8 time slot on the same carrier frequency to the unique user branch.Wireless interface resource can be shared according to being chosen between the voice-and-data business of service traffics and network operator.
The asymmetric transmission of support uplink and downlink more effectively realizes the intercommunication with IP network.GPRS provides and IP network, the X.25 intercommunication of network from protocol architecture.
All functions that can provide Internet to provide to the user.The user will have IP fixing or dynamic assignment a address when having a telephone number.GPRS user's settling time is shorter.
The operator can be with the user service flow amount as expenses standard.
Provide than GSM data service rich data business (also comprising supplementary service and short message service) more to the user, support four kinds of QoS.
In other words, GPRS is the wireless network of the group mode on a kind of GSM of being superimposed upon, and can upgrade to any one GSM network, makes the GSM network can be from second generation mobile communications network to the evolution of the third generation (3G) network, the system in the 2.5th generation of being known as.It maximally utilises existing wireless network infrastructure, has improved wireless resource utility efficiency.
Fig. 1 illustrates GPRS standard framework.
GPRS one deck network that superposeed on the basis of GSM legacy network is formed the GSM/GPRS network, GPRS has increased service universal grouping wireless business supporting node (ServingGPRS Support Node on the basis of GSM network, abbreviation " SGSN "), ggsn (Gateway GPRS Support Node is called for short " GGSN "), charging gateway (optionally), Border Gateway entities such as (optionally).Simultaneously, realize connection between each entity by the GPRS backbone network.
Wherein, SGSN is a basic composition network element of packet switching (Packet Switching is called for short " PS ") network.Its significant feature is the subscriber equipment (UserEquipment for this SGSN coverage, abbreviation " UE ") IP that transmits I/O divides into groups, its status is similar to circuit switching (Circuit Switching, abbreviation " CS ") the visit mobile services switching centre in the territory (Visitor Mobileservices Switching Center is called for short " VMSC ").
The function that SGSN provides comprises: the route and the forwarding capability of the packet data package in this SGSN area, for all the PS users in this SGSN area provide service, encrypt and authentication functions, conversation management functional, the mobile management function, and with universal mobile telecommunications system grounding wireless access network (UMTSTerrestrial Radio Access Network, be called for short " UTRAN "), GGSN, attaching position register (Home Location Register, be called for short " HLR "), (the Mobile SwitchingCenter of mobile switching centre, be called for short " MSC "), short message service GMSC (gateway mobile switching center) (Short MessageService-Gateway Mobile Switching Centre, be called for short " SMS-GMSC "), short message InterWorking MSC interface functions such as (MSC Short Message Service Interworking MSC are called for short " SMS-IWMSC ").
Also integrated (the Visitor LocationRegister of VLR Visitor Location Register in the CS network that is similar among the SGSN, abbreviation " VLR ") function, when the user is in Attached (adhering to) state, stored among the SGSN with grouping relevant user profile and positional information.Similar with VLR, the most of user profile among the SGSN is obtained from HLR in position updating process.
In addition, GGSN also is one the Network Element Function entity of introducing in order to provide the PS business function in the UMTS network, and route and the encapsulation of packet between PS net and external data network is provided.Which GGSN the user selects as gateway, is definite according to the Access Point Name (APN) of user's CAMEL-Subscription-Information and user's request in packet data protocol (Packet Data Protocol, be called for short " PDP ") context activation process.
The function that GGSN provides comprises: with the interface function of external IP packet network, specifically, GGSN need provide UE to insert the critical point function of extenal grouped network, viewpoint from extranets, GGSN just looks like to be the router of all User IPs in the addressable PS network, need be with the external network exchanging routing information; Session management promptly, is finished UE and is set up process with the communication of extranets; And the function that mobile subscriber's grouped data is mail to correct SGSN.
Terminal is under READY (business is carried out) state, moved into new sub-district, and new sub-district belongs to another SGSN (GPRS service node), then terminal must be done the position renewal, switch to new sub-district by former sub-district, will make the Routing Area Update between SGSN during switching.
State before the SGSN Routing Area Update as shown in Figure 2, wherein heavy line is the carrying of transmission terminal business data packet.Can see that this bearer path is " GGSN---former SGSN---source BSC---source base station---terminal ".
State behind the SGSN Routing Area Update as shown in Figure 3, wherein heavy line is the carrying of transmission terminal business data packet.Can see that this bearer path is " GGSN---target SGSN---target BS C---target BS---terminal ".
When switching, be cached with the data that send to terminal from the needs of GGSN among the former SGSN, these data GGSN may not keep.And after switching, new bearer path has switched to target SGSN and has gone, and no longer passes through former SGSN, thus the data among the former SGSN can be dropped, thereby cause losing of data.Terminal can trigger the re-transmission on upper strata in the time of can't receiving desired data in the time of pre-fixed length, thereby causes the shake and the delay of business data packet.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of changing method and mobile communications network of SGSN-spanning, makes that terminal losing of business data packet when SGSN-spanning switches reduced.
For achieving the above object, the invention provides a kind of changing method of SGSN-spanning, comprise following steps:
Terminal is when the route district of former SGSN switches to the route district of target SGSN, network side keeps the carrying of first between former SGSN and the GGSN, between former SGSN and target SGSN, set up second carrying, by the business data packet of the described first and second carrying transmission terminals.
Wherein, described terminal is for using the terminal of grouping commutative field service.
In this external described method, described business comprises Streaming Media and session service.
In this external described method, former SGSN sends to this terminal with the data of the described terminal of institute's buffer memory by target SGSN after second carrying is set up.
The present invention also provides a kind of mobile communications network, comprise at least one GGSN and at least two SGSN, when the SGSN at the original place of terminal is used for terminal in its route district and switches to the route district of target SGSN, be second carrying between this terminal foundation and the target SGSN, and the carrying of first between maintenance and the GGSN;
GGSN is used for terminal when the interval switching of different SGSN routes, first carrying between maintenance and the original place SGSN of this terminal.
Wherein, described terminal is for using the terminal of grouping commutative field service.
In addition, described business comprises Streaming Media and session service.
In addition, the original place SGSN of terminal also is used for after second carrying is set up, and the business data packet of this terminal of institute's buffer memory is sent to this terminal by target SGSN.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, when the terminal SGSN-spanning switches, network side keeps carrying between former SGSN and the GGSN constant, a newly-built carrying between former SGSN and target SGSN is by the business data packet via the carrying transmission terminal of GGSN, former SGSN and three nodes of target SGSN.Can issue target SGSN by newly-built carrying because former SGSN is the packet of terminal buffers, send to terminal by target SGSN again, so losing of business data packet can reduce or avoid.The business datum packet loss must lack, and the chance that needs to retransmit also can diminish, and the shake of business data packet and delay also can correspondingly improve.
Description of drawings
Fig. 1 is the framework schematic diagram of GPRS in the prior art;
Fig. 2 is the network state schematic diagram before the routing update between SGSN in the prior art;
Fig. 3 is the network state schematic diagram after the routing update between SGSN in the prior art;
Fig. 4 is according to the network state schematic diagram after the routing update between the SGSN of embodiment of the present invention;
Fig. 5 is the switching flow figure according to the SGSN-spanning of embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The flow process of method execution mode of the present invention as shown in Figure 5.
In step 510, using the terminal of packet switching (Packet Switching, be called for short " PS ") territory business to initiate from the route district of former SGSN to the switching in the route district of target SGSN.The employed PS of terminal territory business can be Streaming Media, session service or the like.The data of PS territory business must be passed through GGSN.
After this enter step 520, first carrying of setting up for terminal between GGSN and the former SGSN remains unchanged.The GGSN continuation sends to former SGSN to the business data packet that needs send to this terminal, and former SGSN carries out buffer memory to these data.
After this enter step 530, when former SGSN initiates to switch in terminal, carry out alternately, newly-built second carrying between former SGSN and target SGSN with target SGSN.Second carrying is used for the business data packet of transmission terminal between these two SGSN.
After this enter step 540, after second carrying is set up, former SGSN will send to target SGSN for the downlink service data bag of terminal buffers, be handed down to terminal by target SGSN by target BS C and target BS.Losing of business data packet because being the packet of terminal buffers, former SGSN can successfully send to terminal, so can reduce or avoid.The business datum packet loss must lack, and the chance that needs to retransmit also can diminish, and the shake of business data packet and delay also can correspondingly improve.
After terminal switches to target SGSN subordinate's target BS, according to the path of target BS, target BS C, target SGSN, former SGSN, GGSN to the network side response data.
After this, if terminal base station of the former SGSN of switchback again in switching then discharges second carrying next time, return to state shown in Figure 2 again.
If terminal switches to another target SGSN base station of (being called second target SGSN here) in switching next time, then discharge the carrying of second between former SGSN and the target SGSN, newly-built the 3rd carrying between the former SGSN and second target SGSN, network state and Fig. 4 are similar, just make target SGSN into second target SGSN and get final product.Certainly, because a SGSN can manage a lot of base stations, so the probability of situation about switching between a plurality of SGSN continuously appearance is less.
Network configuration in network implementation mode of the present invention as shown in Figure 4.This network relates generally to a GGSN and two SGSN, and these two SGSN switch the back provides service for terminal target SGSN for terminal provides the former SGSN of service and terminal SGSN-spanning before the terminal SGSN-spanning switches.The function of these three network equipments in terminal SGSN-spanning handoff procedure unlike the prior art.Describe respectively below:
GGSN is used for terminal when the interval switching of different SGSN routes, first carrying between maintenance and the former SGSN.And in the prior art, GGSN be deleted and former SGSN between carrying, and newly-built carrying between the target SGSN.
Former SGSN is used for when terminal switches to target SGSN, second carrying between the newly-built and target SGSN, and the carrying of first between maintenance and the GGSN.And in the prior art, former SGSN is the carrying between deletion and the GGSN.Former SGSN also is used for after second carrying is set up, and the terminal traffic packet of institute's buffer memory is sent to this terminal by target SGSN.And in the prior art, former SGSN has abandoned and has been this terminal institute cached business data bag.
Target SGSN is used for terminal to be switched when coming from former SGSN, and second between newly-built and the former SGSN carries.And in the prior art, target SGSN be and GGSN between newly-built carrying.
The network state that forms after SGSN-spanning switches as shown in Figure 4, heavy line wherein is the bearer path for Terminal Service, as can be seen, the bearer path of the solution of the present invention formation is: GGSN---former SGSN---target SGSN---target BS C---target BS---terminal.GGSN can also with other network, as connections such as Internet, so that provide service for terminal.Because former SGSN has been retained in the bearer path of new formation, so the cached business data Bao Buhui of former SGSN loses the shake and also corresponding the improving of delay of the business data packet that is caused by the SGSN-spanning switching.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (6)
1. the changing method of a SGSN-spanning is characterized in that, comprises following steps:
Terminal is when the route district of former SGSN switches to the route district of target SGSN, network side keeps the carrying of first between former SGSN and the GGSN, between former SGSN and target SGSN, set up second carrying, by the business data packet of the described first and second carrying transmission terminals;
Former SGSN sends to this terminal with the data of the described terminal of institute's buffer memory by target SGSN after second carrying is set up.
2. the changing method of SGSN-spanning according to claim 1 is characterized in that, described terminal is for using the terminal of grouping commutative field service.
3. the changing method of SGSN-spanning according to claim 2 is characterized in that, described business comprises Streaming Media and session service.
4. mobile communications network, comprise at least one GGSN and at least two SGSN, it is characterized in that, when the SGSN at the original place of terminal is used for terminal in its route district and switches to the route district of target SGSN, be second carrying between this terminal foundation and the target SGSN, and the carrying of first between maintenance and the GGSN;
GGSN is used for terminal when the interval switching of different SGSN routes, first carrying between maintenance and the original place SGSN of this terminal;
The original place SGSN of terminal also is used for after second carrying is set up, and the business data packet of this terminal of institute's buffer memory is sent to this terminal by target SGSN.
5. mobile communications network according to claim 4 is characterized in that, described terminal is for using the terminal of grouping commutative field service.
6. mobile communications network according to claim 4 is characterized in that described business comprises Streaming Media and session service.
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| CN102123463B (en) * | 2010-01-12 | 2013-01-16 | 中兴通讯股份有限公司 | Wideband code division multiple access (WCDMA) core network and WCDMA core network-based switching method |
| CN102958131B (en) * | 2011-08-16 | 2015-07-15 | 北京信威通信技术股份有限公司 | VLAN (virtual local area network) proxy based routing-area-crossing data traffic switching method |
| CN102752815B (en) * | 2012-06-26 | 2015-12-16 | 华为技术有限公司 | Transmit the method for logic link control protocol data cell, controller and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1561648A (en) * | 2001-10-05 | 2005-01-05 | 艾利森电话股份有限公司 | Optimization of handover procedures in GPRS |
| CN1717098A (en) * | 2004-06-28 | 2006-01-04 | 华为技术有限公司 | Mobile terminal roaming method based on configuration technology |
| CN1722901A (en) * | 2004-07-16 | 2006-01-18 | 华为技术有限公司 | A method of serving radio network subsystem (SRNS) redirection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1561648A (en) * | 2001-10-05 | 2005-01-05 | 艾利森电话股份有限公司 | Optimization of handover procedures in GPRS |
| CN1717098A (en) * | 2004-06-28 | 2006-01-04 | 华为技术有限公司 | Mobile terminal roaming method based on configuration technology |
| CN1722901A (en) * | 2004-07-16 | 2006-01-18 | 华为技术有限公司 | A method of serving radio network subsystem (SRNS) redirection |
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