CN102223677A - Switching method and switching system based on IASA (inter access system anchor) load balancing device - Google Patents
Switching method and switching system based on IASA (inter access system anchor) load balancing device Download PDFInfo
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Abstract
The invention discloses a communication system and a communication method based on an IASA (inter access system anchor) load balancing device, belonging to the technical field of communication. In the invention, the load balancing device carries out centralized perception to all access networks in the heterogeneous convergence communication field to control switching between a 3GPP (3rd generation partnership project) access system and other access systems; and after the network is accessed to a user, the IASA load balancing device monitors and scans load conditions of all access network gateways in a real-time manner, and calculates the average load rate of all gateways and network load factor. If the network load exceeds the threshold value, partial users switch to other networks with light loads; and if the network load does not exceed the threshold value, and the current gateway load of the user is overweight, the user switches to other gateways of the current network. By adopting the invention, the load balance of the access network and the gateway can be realized, and the network performance problems such as congestion, call drop and time delay extension caused by heavy network or gateway load are solved.
Description
Technical field
The present invention relates to isomery converged communication field, (the 3 to be specifically related to the 3G (Third Generation) Moblie partnership project
RdGeneration Partnership Project is called for short 3GPP) and the mobile communication system Long Term Evolution that proposes (Long Time Evolution, LTE)/System Architecture Evolution (System Architecture Evolution, SAE) communication in.
Background technology
Along with the continuous development of the communication technology, various new wireless access wide band technologies continue to bring out, and the 3G system has been formed challenge.In order to guarantee that 3GPP is in 10 years even the competitiveness after 10 years, 3GPP has started wireless access network Long Term Evolution research project (Long Term Evolution in 2004, LTE), in addition, 3GPP has also carried out the related work of System Architecture Evolution, and it is defined as SAE(System Architecture Evolution, System Architecture Evolution), to reach the minimizing time delay, higher user data rate, higher power system capacity and better covering are provided, reduce the purpose of operator's cost.
In SAE isomery fusion architecture, core net (EPC) is the data message scheduling of being responsible between each heterogeneous access networks and the center control section that switches.Since each Access Network can not the mutual perception ambient network behaviour in service, can't know information such as wireless resource utility efficiency, in the overlapping region that a plurality of heterogeneous networks cover if only by received signal intensity (RSS, Received Signal Strength) selects access network, may cause some network to be selected by the stronger user of a large amount of RSS, and other networks are only selected by less user, promptly exist the load between the heterogeneous network unbalanced, under the serious situation, may cause certain network congested problem too much to take place because of inserting the user.
In the SAE framework, different Access Networks can be 3GPP network or non-3GPP network, and wherein, the 3GPP network mainly is meant access networks such as 2G, 3G and E-UTRAN, but not the 3GPP network mainly comprises WLAN, networks such as WiMAX.
" fusion " of dissimilar wireless networks becomes the inexorable trend of future wireless development, because heterogeneous network is in the network architecture, the difference of aspects such as safety guarantee and Qos mechanism, it is the process of a complexity that isomery merges, the a plurality of aspects that relate to mobile communication system comprise service layer, control aspect, access aspect, transmission aspect and air interface aspect.In design and realization heterogeneous wireless network convergence systematic procedure, fusion between the different radio access network will face many technical problems, as seamless mobility management, UNE framework, heterogeneous wireless resource management, end-to-end reshuffle and QoS ensures etc.Wherein, the mobility management mechanism that the fusion architecture design of xenogenesis wireless access technology reaches based on certain architectures is basis and an important leverage of supporting the seamless fusion of isomery, also be the emphasis of heterogeneous network and new network architectural studies, have important scientific research and engineering application value.
Merge problem for heterogeneous network, application number is 200510019098 patent " fusion method of WLAN (wireless local area network) and 3GPP net ", at wireless lan (wlan) and 3GPP network integration scene, design gateway or agency, unified with the authentication that realizes two kinds of network-termination devices; Application number is 200810040678.7 patent " control device and the method that are used for heterogeneous wireless network convergence in a kind of gateway device ", a kind of control method that is used for heterogeneous wireless network convergence in gateway device is provided, comprises the data message that receives self terminal; Data message is carried out format conversion and to Correspondent Node being sent data message, and a kind of control device and a kind of restaurant food ordering management system that is used for heterogeneous wireless network convergence in gateway device is provided.This invention realizes the communication of different networks equipment room, and preferably is applicable to ZIGBEE network and blueteeth network that above patent is not all considered the problem of load balancing between each isomerization access network by merging heterogeneous wireless network.
Under the new framework of LTE/SAE, application number is 200810108646.6 patent application " a kind of changing method of load rebalance of mobility management entity ", a kind of changing method of load rebalance of mobility management entity is provided, when the heavy balance of generation load is switched, can guarantee effectively that UE is follow-up and the network interworking flow process is carried out normally and the continuing property of session, realize the load balancing between the MME; More than study between each sub-district that mainly is confined in the homogeneous network, for the mobile management between the isomery connecting system, resource management especially problem of load balancing does not also have clear and definite regulation and research method.
Summary of the invention
For solving the above-mentioned technical problem that exists in the prior art, the present invention proposes a kind of based on spanning into the anchor point (IASA of system, the load balancing device of center perception isomerization access network load state Inter Access System Anchor), to be implemented in the SAE isomery fusion architecture, to the concentrated perception and the control of each Access Network utilance.The changing method based on load balancing between a kind of 3GPP connecting system and other connecting systems is provided, to solve most of users only with received signal intensity (RSS, Received Signal Strength) as the network insertion criterion, cause between each Access Network load unbalanced, some offered load is overweight, even the possibility of generation " paralysis ", be specially:
A kind of changing method of the load balancing device based on IASA, IASA load balancing device real time scan detects the load state information of all IADs, is higher than gateway nominal load rate threshold value if connect the gateway average load rate of this subscriber equipment in the period T
, whether the load factor of calculating current access network in this cycle is greater than offered load rate threshold value
If the load factor of current access network is more than or equal to threshold value
, trigger vertically and switch, select the light network of load as the switching target network, the gateway that load factor is minimum in the selection switching target network is as intended gateway; If the load factor of current access network is lower than threshold value, the triggering level is switched, and selects the lightest gateway of load as switching reorientation purpose gateway in consolidated network, finally finishes the switching of subscriber equipment between heterogeneous network
IASA has the function of all gateways use information in each isomery connecting system of real-time monitoring (comprising 3GPP system and non-3 GPP system).The present invention adds load equalizer in IASA.This load equalizer adopts suitable distribution method that network requests is distributed on the available gateway in the isomery gateway pond (as shown in Figure 1).On the one hand, the load of the data traffic by each gateway of management turnover between can balanced heterogeneous network, thus make the visitor of network can select best IAD and reduce the congested generation of " focus " Local Area Network.On the other hand, because the gateway service disruption that physics aspect (power down, hardware/software fault) causes, cause this gateway can not be again that subscriber equipment service, this load equalizer can guarantee that the stable service network that withdraws from of gateway interrupts to avoid subscriber equipment to connect.After definite certain gateway will withdraw from service, can to not finish the transfer of data work of the subscriber equipment of previous connection simultaneously with any new user equipment allocation to this gateway.Thereby having guaranteed does not have the good service of interrupting, and has simplified the management to gateway.
Particularly, described method comprises:
A) subscriber equipment is selected access network (the non-3GPP of 3GPP/) according to the size of received signal intensity (RSS Received Signal Strength).
Subscriber equipment is judged according to the signal strength signal intensity of the non-3GPP network of 3GPP/ that receives and is selected access network.
B) IASA load balancing device is monitored the load state of the gateway of each access network of scanning in real time.
C) IASA load balancing device calculates the average load rate of all gateways in the one-period T.
If certain gateway average load rate is higher than nominal load rate threshold value, i.e. this gateway load is overweight, then calculates the load factor value of this gateway belonging network in this cycle; If the gateway load is reasonable, then continue to monitor and calculate the load factor value of this gateway in following one-period.
D) IASA load balancing device calculates the load factor of network in the one-period T.
E) if need vertically switch, then the user need switch to comparatively idle network from current network.IASA load balancing device notification source gateway vertically switches preparation, and selects load factor is minimum in the switching target network gateway as intended gateway, and informs the address of ownership goal network and gateway.Finish the switching of user between 3GPP and non-3GPP network at last.
F) if need carry out level switches, promptly overweight the or congestion problems of load does not appear in the residing network of user, and the gateway load that subscriber equipment connected is overweight.IASA load balancing device selects the lightest gateway of load as intended gateway by comparing the loading condition of each gateway, and the user carries out to switch and is relocated to intended gateway.
G) for the overweight access network of load, IASA load balancing device is notified in the corresponding access point next cycle and is forbidden new user's access, thereby avoids the current network load state to worsen; The systematic function of having avoided unnecessary switching to cause simultaneously descends.
The present invention also proposes a kind of switched system of the load balancing based on IASA, IASA load balancing device real time scan detects the load state information of all gateways in the network, is higher than gateway nominal load rate threshold value if connect the gateway average load rate of this subscriber equipment in the period T
, whether the load factor of calculating current access network in this cycle is greater than offered load rate threshold value
If the load factor of current access network is more than or equal to threshold value
, IASA load balancing device notification source gateway vertically switches, and selecting the light network of load is the switching target network, and the gateway that load factor is minimum in the selection switching target network is finished the switching of subscriber equipment between different access networks as intended gateway; If the load factor of current access network is lower than threshold value
, the triggering level is switched, and selects the lightest gateway of load as switching the reorientation intended gateway in consolidated network, and the user carries out to switch and is relocated to intended gateway, realizes subscriber equipment switching between the different gateways under consolidated network.
The communication means based on the load balancing device of IASA that the present invention proposes has solved under the EPS framework among the SAE, and the problem of load balancing between the isomery connecting system has improved utilization ratio of wireless resources, can alleviate the congested of network effectively, timely.To realizing the maximization of system combined resource, improve user QoS satisfaction, all significant, wide application prospect is arranged.Can support operator and other service suppliers effectively to improve the utilance of resource, alleviating network congestion is realized optimizing configuration on network resource, obtains good economic benefit.
Description of drawings
Fig. 1: based on the network architecture figure of IASA load balancing device;
Fig. 2: based on the switching flow block diagram of IASA load balancing device;
Fig. 3: the switching flow schematic diagram of the homogeneous network load balancing that the present invention realizes;
Fig. 4: the switching flow schematic diagram of the heterogeneous network load balancing that the present invention realizes.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further detailed explanation below in conjunction with drawings and the specific embodiments.
Fig. 1 is the network architecture figure based on IASA load balancing device, and the SAE framework in the employing 3GPP standard is as system configuration of the present invention.Shown system architecture can comprise two kinds of networks (WLAN and 3GPP network), two kinds of access points (AP and BS), the load balancing device based on IASA, a plurality of gateway node (ePDG and MME), a plurality of portable terminal (UE) and a home subscriber server (HSS).Wherein: span into the anchor point (IASA of system, Inter Access System Anchor) can support the mobility between different access systems, promptly can trigger the switching of user between different access systems (3GPP system and non-3 GPP system), have the function of real-time monitoring ambient network gateway resource operating position.
The packet data gateway ePDG(Evolved Packet Data Gateway of evolution), be based on the interoperability between 3GPP connecting system and the WLAN and the further evolution of the network element PDG that designs, be responsible for the forwarding of packet data package, and authentication etc.
Mobility Management Entity MME(Mobile Management Entity) is responsible for mobile management in the core network, comprises that the carrying control of paging, security control, core net and terminal are in the mobility control of idle condition etc.
Home subscriber server HSS(Home Subscriber Server), comprises user profile, carry out user's authentication and mandate, and the information of relevant user's physical location can be provided.
Subscriber equipment realizes that by the IAD and the core net of each connecting system wherein, the IAD of 3GPP connecting system is MME alternately, and the wlan system IAD is ePDG.IASA load balancing device is periodically collected the load information of each IAD (MME, ePDG) and network (3GPP, WLAN), assessment load operating position.For the offered load appropriateness, and the overweight situation of some gateway load notifies the user to switch to the lighter purpose gateway of load from the heavy source gateway level of load; For the overweight situation of access network load, select the lighter access network of load, and notify the user vertically to switch to the lighter purpose network of load from the heavy source network of load.
Fig. 2 is the switching flow figure based on IASA load balancing device.Specifically comprise:
A) subscriber equipment (portable terminal) is selected access network (the non-3GPP of 3GPP/) according to the size of received signal intensity (RSS).Particularly, subscriber equipment is judged and the selection access network according to the signal strength signal intensity of the non-3GPP network of 3GPP/ that receives, the network that received signal intensity is strong.
B) IASA load balancing device is monitored the load state of the gateway of each access network of scanning in real time.
C) IASA load balancing device calculates the average load rate of each gateway in the one-period T.
If certain gateway average load rate is higher than specified gateway load factor threshold value (this threshold value can be according to the traffic carrying capacity in the coverage, and the gateway bearing capacity is determined), show that this gateway load is overweight, then calculate the load factor value of this gateway belonging network in this cycle.If the gateway load is reasonable, then continue to monitor and calculate the load factor value of this gateway in following one-period.
Particularly, IASA load balancing device is gathered the capacity that t moment current gateway buffer memory has used
, the total capacity of calculating gateway buffer memory
, according to formula
Calculate i gateway t momentary load rate constantly, according to formula
The average load rate of gateway i in the computing cycle T.If
, illustrate that then gateway i load is overweight.
D) IASA load balancing device calculates access network load factor in the one-period T.Supposing has n gateway in this network, the load balancing device is according to the average load rate in all gateway period T in the network of step c calculating
,
, according to formula
Calculate the load factor of network in the one-period, with this load factor and offered load rate threshold value
(this threshold value can be determined according to the bearing capacity of network when the network planning) compares, if
, then this offered load is overweight this cycle, otherwise illustrates that offered load is reasonable in this cycle.
Further, by network load factor in a plurality of cycles of comprehensive assessment, can determine the steady-state value of offered load rate.Preferably, can carry out comprehensive assessment to offered load in three cycles, in chronological sequence order is labeled as three cycles respectively: (
), by (promptly with the historical use information of network
Network load factor in cycle) with current use information (
Network load factor in cycle) be weighted, can get the steady state load rate value of network:
Wherein
Be three weight factors, the pass between the three is
And
, promptly bigger to the influence of steady-state value apart from the offered load rate of current time in nearer time period.
If
, illustrate that then network is busy, need vertically switch (changes step e); Otherwise illustrate that network utilization is reasonable, only load to occur overweight for current gateway, then should carry out level and switch and (change step f).
E) if need vertically switch, promptly current access network load is overweight, occurs congestedly easily, and then the user need switch to comparatively idle network from current network.IASA load balancing device notification source gateway vertically switches preparation, promptly select to switch load factor is minimum in the purpose network gateway as intended gateway, and informs the address of ownership goal network and gateway.Finish the switching of user between heterogeneous network at last.
F) if need carry out level switches, promptly overweight the or congestion problems of load does not appear in the residing network of user, and the employed gateway load of subscriber equipment is overweight.
IASA load balancing device selects the lightest gateway of load as intended gateway by comparing the loading condition of each gateway, and the user carries out to switch and is relocated to intended gateway.
G) for the overweight access network of load, IASA load balancing device is notified in the corresponding access point next cycle and is forbidden new user's access, thereby avoids the current network load state to worsen; The systematic function of having avoided unnecessary switching to cause simultaneously descends.
Fig. 3 for be used in the embodiment of the invention SAE system architecture based on the switching flow figure of load balancing between the different gateways in the homogeneous network.As shown in Figure 3, the switching flow of portable terminal comprises:
The real-time transmitting supervisory request message of step 301-304:IASA.
IASA load balancing device is to source gateway and candidate target gateway (be labeled as gateway 1, gateway 2 and gateway 3, the gateway kind among the present invention comprises ePDG and MME) broadcasting monitoring solicited message, and purpose is to collect the load information of each gateway.
Step 305-308: transmitting supervisory request-reply message.
Each gateway is to IASA load balancing device transmitting supervisory request-reply information, comprising load information separately.
Step 309:IASA load balancing device is assessed each gateway loading condition.If user's current gateway and belonging network load are all reasonable, then the user continues resident this gateway, does not switch; (repeating step 301-308).If judge that certain gateway load is overweight, and offered load is reasonable, changes step 310.
Step 310:IASA load balancing device sends the overweight switching reorientation of load notification message to source gateway.
IASA load balancing device is decided to be intended gateway with the minimum gateway of load factor in gateway 1, gateway 2, the gateway 3, and with the address notification source gateway of this gateway.Be the minimum gateway of load factor by calculating gateway 2 among the present invention.
Step 311: source gateway is an intended gateway to gateway 2() transmission reorientation notice.Wherein, comprise user ID and intended gateway identification information.
Step 312: source gateway sends the overweight switching notice of load to AP/BS, the intended gateway address that notice AP/BS switches to.
Step 313:AP/BS sends handoff request message to source gateway, and the request source gateway leaves AP/BS.
Step 314: gateway 2 sends handoff request message to AP/BS, and request is connected with AP/BS.
Step 315:AP/BS sends handoff request ACK to intended gateway.
Step 316: gateway 2 sends to source gateway and transmits relocation response message.
Step 317: source gateway sends switching command to AP/BS, prepares to carry out to switch.
Step 318: between AP/BS and intended gateway, carry out and switch and reorientation.
Step 319:AP/BS source of release gateway resource, indication is switched and is finished, and promptly source gateway disconnects with AP/BS.
Step 320:AP/BS sends to switch to gateway 2 and finishes notice, and indication is switched and finished, and promptly intended gateway switches on the AP/BS.
Step 321: gateway 2 sends the forwarding reorientation to source gateway and finishes message, and the notification source gateway switches to be finished.
Step 322: source gateway is finished to gateway 2 transmission forwarding reorientations and is replied.
Step 323: to HSS register update gateway 2.
Fig. 4 is according to the switching flow block diagram based on load balancing between the heterogeneous network that is used for the SAE system architecture in the embodiment of the invention.As shown in Figure 4, the switching flow of portable terminal comprises:
Step 401-404: transmitting supervisory request message.
IASA load balancing device is the gateway ePDG in WLAN and gateway MME1, MME2 in the 3GPP network and MME3 broadcasting monitoring request message periodically, and purpose is to collect the load information of gateway in WLAN and the 3GPP network.
Step 405-408: transmitting supervisory response message.
Gateway ePDG and MME1, MME2 and MME3 are to IASA load balancing device transmitting supervisory request-reply message, comprising load information separately.
Step 409:IASA load balancing device assessment 3GPP network and WLAN load condition.
If user's current gateway and belonging network load condition are normal, then the user continues resident (repeating step 401-408); If judge that the wlan network load is overweight, then IASA load balancing device triggers UE and switches to the 3GPP network, changes step 410-412.
Step 410-412: send switching command.
IASA load balancing device sends vertical switching command to portable terminal step by step, and carries objective network and gateway address.The gateway that load factor is the lightest in the IASA load balancing device selection 3GPP network is as intended gateway, if gateway MME1 compares the load factor minimum with gateway MME2 with MME3, then defining gateway MME1 is intended gateway.
Step 413:UE initiates handoff request and linking objective gateway MME1 to BS.
Step 414: send authentication message.
Intended gateway MME1 sends authentication message to HSS.
Step 415: intended gateway MME1 is that mobile terminal UE is distributed its IP address in new network.
Step 416: foundation is connected required resource with target radio network, comprises in the network being the bandwidth of UE distribution, user's up TEID(Tunnel Identifier) parameter etc.
Step 417-420: intended gateway MME1 sends handoff completion message step by step to mobile terminal UE.
Step 421: the resource of source of release wireless network (WLAN).
Step 422-423:AP sends to switch to the IASA load balancing by source gateway ePDG and finishes response message, and indication is switched and finished.
Step 424: to HSS register update gateway MME1.
Claims (10)
1. changing method based on the load balancing device of IASA, it is characterized in that: IASA load balancing device real time scan detects the load state information of all gateways in the network, is higher than gateway nominal load rate threshold value if connect the gateway average load rate of this subscriber equipment in the period T
, whether the load factor of calculating current access network in this cycle is greater than offered load rate threshold value
If the load factor of current access network is more than or equal to threshold value
, trigger vertically and switch, selecting the light network of load is the switching target network, the gateway that load factor is minimum in the selection switching target network is finished the switching of subscriber equipment between different access networks as intended gateway; If the load factor of current access network is lower than threshold value
, the triggering level is switched, and selects the lightest gateway of load as switching the reorientation intended gateway in consolidated network, realizes subscriber equipment switching between the different gateways under consolidated network.
2. changing method according to claim 1 is characterized in that: the method for described calculating gateway average load rate and offered load rate is: IASA load balancing device is gathered the capacity that t moment current gateway buffer memory has used
, the total capacity of calculating gateway buffer memory
, according to formula
Calculate i gateway t momentary load rate constantly
, according to formula
The average load rate of gateway i in the computing cycle T
According to formula
Calculate the load factor of network in the one-period
, n is the gateway number.
3. changing method according to claim 1 is characterized in that: further, according to network load factor in a plurality of cycles, determine the steady-state value of offered load rate, network load factor in a plurality of cycles is weighted, obtain the steady state load rate value of network
, if
, illustrating that network is busy, need vertically switch, switch otherwise only carry out level.
4. changing method according to claim 1 is characterized in that: for the overweight access network of load, IASA load balancing device is notified and is forbidden in the corresponding access point next cycle that new user inserts, and avoids unnecessary switching.
5. changing method according to claim 1, it is characterized in that: in the homogeneous network between the different gateways, each gateway is to IASA load balancing device transmitting supervisory request-reply information, if user's current gateway and belonging network load are all reasonable, then the user continues resident this gateway, does not switch; IASA load balancing device sends the overweight switching reorientation of load notification message to source gateway, and the gateway that load factor is minimum is decided to be intended gateway, the intended gateway address that source gateway notice access point AP/BS switches to; AP/BS sends handoff request message to source gateway, and the request source gateway leaves AP/BS; AP/BS sends handoff request ACK to intended gateway, and source gateway sends switching command to AP/BS, carries out between AP/BS and intended gateway and switches and reorientation; AP/BS source of release gateway resource.
6. changing method according to claim 1, it is characterized in that: for heterogeneous network, switching as portable terminal between 3GPP network and the wlan network, the gateway of heterogeneous network is to IASA load balancing device transmitting supervisory request-reply message, IASA load balancing device assessment 3GPP network and WLAN load condition, if user's current gateway and belonging network load condition are normal, then the user continues resident; If judge that the wlan network load is overweight, then IASA load balancing device triggering mobile terminals UE switches to the 3GPP network; IASA load balancing device sends vertical switching command to portable terminal step by step, and the gateway that load factor is the lightest in the IASA load balancing device selection 3GPP network is as intended gateway; UE initiates handoff request and linking objective gateway to base station BS, intended gateway is that UE distributes its IP address in new network, foundation is connected required resource with new network, and intended gateway sends handoff completion message step by step to portable terminal, the resource of source of release wireless network.
7. switched system based on the load balancing of IASA, it is characterized in that: IASA load balancing device real time scan detects the load state information of all gateways in the network, is higher than gateway nominal load rate threshold value if connect the gateway average load rate of this subscriber equipment in the period T
, whether the load factor of calculating current access network in this cycle is greater than offered load rate threshold value
If the load factor of current access network is more than or equal to threshold value
, IASA load balancing device notification source gateway vertically switches, and selecting the light network of load is the switching target network, and the gateway that load factor is minimum in the selection switching target network is finished the switching of subscriber equipment between different access networks as intended gateway; If the load factor of current access network is lower than threshold value
, the triggering level is switched, and selects the lightest gateway of load as switching the reorientation intended gateway in consolidated network, and the user carries out to switch and is relocated to intended gateway, realizes subscriber equipment switching between the different gateways under consolidated network.
8. switched system according to claim 7 is characterized in that: the method for described calculating gateway average load rate and offered load rate is: IASA load balancing device is gathered the capacity that t moment current gateway buffer memory has used
, the total capacity of calculating gateway buffer memory
, according to formula
Calculate i gateway t momentary load rate constantly
, according to formula
The average load rate of gateway i in the computing cycle T
According to formula
Calculate the load factor of network in the one-period
, n is the gateway number.
9. switched system according to claim 7, it is characterized in that: in the homogeneous network between the different gateways, each gateway is to IASA load balancing device transmitting supervisory request-reply information, if user's current gateway and belonging network load are all reasonable, then the user continues resident this gateway, does not switch; IASA load balancing device sends the overweight switching reorientation of load notification message to source gateway, and the gateway that load factor is minimum is decided to be intended gateway, the intended gateway address that source gateway notice access point AP/BS switches to; AP/BS sends handoff request message to source gateway, and the request source gateway leaves AP/BS; AP/BS sends handoff request ACK to intended gateway, and source gateway sends switching command to AP/BS, carries out between AP/BS and intended gateway and switches and reorientation; AP/BS source of release gateway resource.
10. switched system according to claim 7, it is characterized in that: for heterogeneous network, switching as portable terminal between 3GPP network and the wlan network, the gateway of heterogeneous network is to IASA load balancing device transmitting supervisory request-reply message, IASA load balancing device assessment 3GPP network and WLAN load condition, if user's current gateway and belonging network load condition are normal, then the user continues resident; If judge that the wlan network load is overweight, then IASA load balancing device triggering mobile terminals UE switches to the 3GPP network; IASA load balancing device sends vertical switching command to portable terminal step by step, and the gateway that load factor is the lightest in the IASA load balancing device selection 3GPP network is as intended gateway; UE initiates handoff request and linking objective gateway to base station BS, intended gateway is that UE distributes its IP address in new network, foundation is connected required resource with new network, and intended gateway sends handoff completion message step by step to portable terminal, the resource of source of release wireless network.
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