CN101043712B - Method and system for realizing switch in wireless communication system - Google Patents
Method and system for realizing switch in wireless communication system Download PDFInfo
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Abstract
The related switch method in wireless communication system comprises: first, SBS of UE determines the UE needs indeed switch operation, obtains target BS message from an intermediate entity; the intermediate entity reports the original and target BS message to SBS; then, according to BS message, SBS executes the switch operation. This invention releases whole system loading, decreases message quantity, and reduces the process complexity for original BS.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the handoff technique in a kind of wireless communication system.
Background technology
In wireless communication system, for satisfying the mobile communication requirement of portable terminal, need in system, realize handoff functionality, to guarantee that terminal can switch to access network under the different entities.Usually, handoff procedure comprises switch decision, switches and prepare and switch to carry out three phases.
In WCDMA R6 (being called for short R6) standard, stipulate, in the switch decision stage, source RNC (radio network controller) is the information that obtains Target RNC by the lur interface, comprise the Target RNC sign, information such as the interference of Target cell and load condition, wherein, Target RNC is to finish providing of area interference and information on load by RRM (RRM) functional entity that is positioned at RNC.Because the terminating point of RRC (Radio Resource control) entity is at RNC, so the judgement of switching and the main body of execution should be RNC, therefore, the switching among the R6 can fully independently be finished at RNC.
Development along with the WCDMA technology, in LTE (long period evolution), 3 nodes of R6, promptly NB (base station), RNC and GGSN (gateway GPRS service node) have become two nodes, are eNB (the wireless universal access base station of evolution) and aGW (the wireless universal IAD of evolution); And, the RRM function among the R6 in LTE also separated into two parts be: the RRM in the sub-district and the RRM of minizone.RRM in the sub-district is relevant with scheduling, is positioned at the eNB node.And the position of the RRM entity of minizone may be at eNB or above eNB node (upper layer node).
At present, relate to obtaining of information before the switch decision for the switching under the state of activation, switch decision and switching command issue contextual processing etc. in the handoff procedure.Wherein, switching command issue with switch in contextual transmission all relevant with the terminating point of RRC entity, the structure of obtaining with minizone RRM entity of switching message is closely related.
The system configuration that provides in LTE has direct or indirect interface as can be known between the eNB.The structure of minizone RRM functional entity have distributed and centralized two kinds may, distributed RRM functional entity is positioned at eNB, centralized RRM functional entity then is positioned on the eNB node, as may be at aGW.
Direct interface is arranged between eNB, when the RRM of minizone is distributed, switching flow under the then corresponding state of activation as shown in Figure 1, in Fig. 1, MME (mobile management entity) and UPE (user entity) and aGW notion are equal to, and, MME and UPE can divide and be arranged, also can adopt both is structures of unification, and when the structure that adopts unification, then Signalling exchange between the two can omit.
As shown in Figure 1, corresponding switching flow specifically may further comprise the steps:
Step 11:UE (subscriber equipment) sends measurement report to source base station;
Step 12: source base station carries out handover decisions according to the information of obtaining from target BS respectively; And behind the decision target BS, send the request contexts data to target BS, promptly send request target base station preparation resource.
Step 13: target BS is ready to the switchable resource of identical UE, sends acknowledge message to source base station, allows source base station to switch.
Because minizone RRM is a distributed frame, so interference between the sub-district and information on load are directly to send to source base station from target BS, source base station is then handled one by one to each target BS information of receiving;
Step 14 is to step 111: source base station will send switching command to UE, carry each target BS information in the order, and UE and each target BS carry out follow-up processing to realize handoff procedure.
In above-mentioned processing procedure, source base station need be handled the message that a plurality of target BS are sent, and therefore, makes that the processing procedure of source base station is comparatively loaded down with trivial details;
And, the structure of the direct interface of the distributed and eNB of this RRM, when making renewal when the RRM of NB information, need send this updating message to each relevant NB, therefore, the frequent signaling traffic load that will cause the interface between the eNB among the LTE between the eNB among the mobility of the UE LTE that may cause is heavier.
In addition, in handoff procedure, the contextual information that comprises resource allocation information is present in source base station and the target BS, but owing between source base station and target BS, do not provide reliable contextual information synchronous implementation, therefore, can't guarantee the consistency of the business of UE.
Direct interface is arranged between eNB, when the RRM of minizone was centralized, corresponding switching flow figure still reference was shown in Figure 1, and between the above-mentioned eNB direct interface is arranged, the RRM of minizone is that the processing mode of distributed situation is similar, and difference is that it is different having only obtaining of minizone RRM information.Each NB sends to the RRM server with oneself interference and information on load, is safeguarded the RRM information of the minizone of NB by the unification of RRM server.Like this, make minizone RRM information renewal and safeguard fairly simple, but still the other problems that exists in the unresolved such scheme.
Between eNB, there is not direct interface, when the RRM of minizone is centralized, corresponding switching flow figure is still with reference to shown in Figure 1, different with the two kinds of situations in front is the direct interface of this situation neither one between eNB, be that interacting message between source base station and the target BS need be realized by intermediate entities, like this, though solved because the change of single NB information causes the signaling traffic load problem of relevant NB information updating information.But do not provide solution yet for the other problems that exists in the handoff procedure.
Summary of the invention
The purpose of this invention is to provide a kind of method and system that in wireless communication system, realize switching, thereby can solve the complexity that source base station is handled, improve hand-off process efficient, and can effectively reduce the load of entire wireless communication system.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of method that in wireless communication system, realizes switching, comprising:
The serving BS of A, subscriber equipment obtains target BS information to intermediate entities after definite subscriber equipment need carry out handover operation; Comprise: after the serving BS of subscriber equipment determines that subscriber equipment need carry out handover operation, then be sent as the request message of acquisition request target BS information to intermediate entities; Described intermediate entities is returned each target BS information that intermediate entities is obtained respectively to this serving BS unification after receiving described request message;
B, described serving BS carry out handover operation according to the described target BS information of obtaining from middle entity;
Described method also comprises:
After target BS was finished switching, the up-to-date contextual information in the serving BS of determining to obtain comprised resource allocation information in the contextual information;
Determine the comparative result of described up-to-date contextual information and the contextual information that obtains before, afterwards, determine whether that according to predetermined judgment criterion needs initiate the resource distribution operation again, and when needed, initiate the resource distribution processing procedure again.
Described intermediate entities comprises:
The universal land radio access web IAD of evolution or the upper layer node on the base station, described gateway comprises Mobility Management Entity and user entity.
Described steps A also comprises:
If serving BS is not received the target BS information that intermediate entities is sent within the predetermined time, then obtain target BS information to intermediate entities again.
Described steps A also comprises:
If described serving BS is not received the target BS information that intermediate entities is sent yet after satisfying predetermined condition, then stop to obtain target BS information to intermediate entities.
Described predetermined condition comprises:
Preset time conditional information and/or the predetermined number of times conditional information that obtains target BS information to intermediate entities.
Described method also comprises:
Serving BS sends to intermediate entities with up-to-date contextual information after obtaining the handoff completion message that target BS sends;
Intermediate entities initiatively sends to target BS with the up-to-date contextual information of the serving BS that obtains.
Described intermediate entities is also shaken hands by signaling or retransmission mechanism sends the up-to-date contextual information of serving BS to target BS.
Described judgment criterion comprises: determine that the synchronous again condition that adopts up-to-date contextual information whether can cause the subscriber equipment physical layer is definite.
Described method is applied in the Long Term Evolution LTE system.
The invention provides a kind of system that in wireless communication system, realizes switching, comprise the serving BS and the switch aim base station of subscriber equipment, it is characterized in that, also comprise:
Intermediate entities is used to receive the request message of described serving BS acquisition request target BS information, and provides each target BS information of obtaining respectively to described serving BS unification;
The target BS information acquisition unit is arranged in the serving BS, is used for obtaining target BS information to intermediate entities after described serving BS determines to carry out handover operation;
The contextual information updating block is arranged in the serving BS, is used for after handoff procedure is finished current contextual information being sent to target BS, and described contextual information comprises resource allocation information;
The resource updates control unit, be arranged in the target BS, be used for after handoff procedure is finished according to the current contextual information of receiving and before the contextual information that obtains, and predetermined judgment criterion determines whether to carry out resource reconfiguration, and triggers the resource reconfiguration unit when needed;
The resource reconfiguration unit is arranged in the target BS, carries out resource reconfiguration operation under the triggering of resource updates control unit.
Described intermediate entities comprises:
The universal land radio access web IAD of evolution or the upper layer node on the base station.
The universal land radio access web IAD of described evolution comprises mobile management entity and user entity.
Described system also comprises:
In described serving BS, also be provided with timer, when the target BS information acquisition unit when intermediate entities is obtained target BS information, pick up counting,, then stop to obtain target BS information to intermediate entities if when timer expiry, do not receive target BS information yet;
Perhaps,
In described serving BS, also be provided with counter, when the target BS information acquisition unit is counted when intermediate entities is obtained target BS information at every turn, when Counter Value reaches predetermined value, do not receive target BS information yet, then stop to obtain target BS information to intermediate entities.
As seen from the above technical solution provided by the invention, among the present invention, owing to adopted the intermediate entities unification that target BS information is sent to serving BS as source base station, therefore, can effectively reduce the load of entire wireless communication system on the one hand, can also reduce the message number of the processing of source base station needs on the other hand, reduce the processing complexity of source base station.Simultaneously, also because after switching is finished, the invention provides the Synchronous Processing process of the contextual information between source base station and the serving BS, make the consistency that can effectively guarantee the UE business in the handoff procedure, promptly guarantee UE after switching, still can obtain with switch finish before consistent resource service.
Description of drawings
Fig. 1 is a hand-off process schematic flow sheet of the prior art;
Fig. 2 is the specific implementation schematic flow sheet one of the method for the invention;
Fig. 3 is the specific implementation schematic flow sheet two of the method for the invention;
Fig. 4 is the specific implementation structural representation of system of the present invention.
Embodiment
Among the present invention,, adopt intermediate entities such as aGW to be present between source base station and the target BS as an information forwarding person when between the eNB during no direct interface.Intermediate entities such as aGW are used for the auxiliary source base station and obtain target BS information, like this, can not introduce tangible influence to time delay for switching, and can optimize performance of handoffs.
Simultaneously, under the intrasystem switch instances of various LTE, also solved the nonsynchronous problem of context in the handoff procedure when in handoff procedure, introducing intermediate entities such as aGW, thereby can keep the consistency of UE service.
In addition, also by taking suitable strategy, make the acquisition process of the target BS information by intermediate entities such as aGW can not produce negative influence among the present invention to the switching between the eNB.
Among the present invention, described intermediate entities can for: aGW, described aGW specifically can comprise MME or two entities of UPE, that is to say, described MME or UPE all can be used as described intermediate entities and realize function corresponding.For ease of the understanding of the present invention, be described in detail below in conjunction with the specific implementation of accompanying drawing to method provided by the invention.
As shown in Figure 2, in handoff procedure, method of the present invention may further comprise the steps:
Step 21: the measurement report that source base station is sent according to UE determines that needs switch;
Step 22: source base station sends information request message to intermediate entities, requires to obtain corresponding target BS information, so that carry out follow-up hand-off process;
For example, can adopt aGW to obtain target BS information, thereby optimize the switch decision process as intermediate entities auxiliary source base station;
Step 23: after intermediate entities receives described request message, return target BS information to source base station;
That is to say, among the present invention, intermediate entities such as aGW are not all directly to be given to source base station in the information of receiving target BS at every turn, but after collecting the information of target BS (one group of target BS) completely, send to source base station according to please seeking unification of source base station again;
Step 24: source base station receives the target BS information that intermediate entities is returned, thereby obtains target BS information;
For guaranteeing to obtain the reliability of target BS information process; at source base station a target BS information processing mechanism of not receiving that under predetermined condition intermediate entities is returned can be set; mechanism such as timer or maximum number of repetitions restriction for example can be set; when source base station still can not obtain target BS information from intermediate entities such as aGW at timer expiry or when surpassing the number of times of re-transmission request message; then source base station will stop to obtain the process of target BS information after timer expiry or after surpassing maximum number of times of transmission.
Step 25: after source base station acquires corresponding target BS information, just can carry out follow-up hand-off process operation, and after handover operation finishes, execution in step 26;
Step 26: target BS carries out the judgement whether needs are initiated the resource distribution operation again according to the up-to-date contextual information of source base station that obtains, comprise resource allocation information in the described contextual information, if desired, then execution in step 27, otherwise, execution in step 28;
The specific implementation of this step is: target BS more up-to-date two hereinafter with the context that obtains before, if adopt new context can not cause the synchronous again of UE physical layer, then select to adopt this up-to-date context, it is execution in step 27, otherwise, do not upgrade context, promptly execution in step 28.
For determining that target BS can accurately obtain the up-to-date contextual information of source base station, need in handoff procedure, back up and transmit corresponding contextual information by intermediate entities; For example can back up and transmit the contextual information of up-to-date source base station to target BS by aGW, do the judgement that reconfigures Radio Resource for target BS, back up and transmit by aGW and make and can shake hands or retransmission mechanism guarantees that the up-to-date contextual information of source base station can be sent to target BS reliably by signaling, and the Radio Resource of source of release base station as early as possible;
The UE successful switch is after target BS, and after target BS obtains the up-to-date contextual information of source base station, then context is compared, whether initiate reshuffling of first resource again according to predefined criterion decision simultaneously, realize that the switching front and back are contextual synchronously;
Be specially: after UE switched to target BS, source base station sent to aGW to context after receiving the handoff completion message of target BS, and aGW initiatively sends to target BS to context.
Realize this step former because: because in handoff procedure, context is arranged at respectively in source base station and the target BS; Source base station contextual information is passed to target BS connects to target BS and UE during, contextual information on the source base station may change, therefore, need be provided with corresponding treatment mechanism with the contextual information of guaranteeing source base station and target BS synchronously, require consistent business so that target BS is set up with new context, guarantee professional service performance;
Step 27: the processing procedure of initiating to reconfigure resource according to the up-to-date contextual information of source base station.
Step 28: need not to initiate to reconfigure the processing of resource.
The invention will be further described with two concrete Application Examples below in conjunction with accompanying drawing.
Embodiment one
Among the present invention, when between the eNB during no direct interface, then corresponding hand-off process flow process specifically may further comprise the steps as shown in Figure 3:
Step 31:UE is to the source base station reporting measurement reports, and the notification source base station need be switched;
Step 32: source base station is received and is then sent information request message to the MME as intermediate entities when described measurement report and affirmation need be switched;
After step 33:MME receives described information request message, definite information and other handover informations that need offer each target BS of source base station;
The information of each target BS that step 34:MME will determine and other handover informations send to source base station by information request response message;
Step 35: information and other handover informations of described each target BS obtained in the information request response that the source base station basis receives, and carries out handover decisions according to this information;
Afterwards, proceed follow-up handoff process, promptly step 36 is to step 315, and step 319, and the processing implementation procedure that concrete processing mode can adopt prior art to provide also can adopt other to handle implementation procedure.
Embodiment two
Corresponding hand-off process flow process provided by the invention specifically may further comprise the steps still as shown in Figure 3:
In this embodiment, step 31 is to step 315, and step 319 all the operation process with embodiment one is identical, different is, has increased the processing procedure of step 316 to step 318 among the embodiment two, specific as follows:
Step 316: after source base station confirms that switching is finished, then send the up-to-date contextual information of UE correspondence to MME;
After step 317:MME receives described up-to-date contextual information, continue to transmit described contextual information to target BS;
Step 318: after target BS obtains described contextual information, then this up-to-date contextual information is compared with the contextual information that obtains before, and determine whether to carry out again corresponding resource distribution operation according to predefined criterion.
By on the basis of embodiment one, having increased the processing of above-mentioned three steps, the professional consistency problem of the UE after can effectively guaranteeing to switch.
The present invention also provides a kind of system that realizes switching in wireless communication system, the specific implementation of this system as shown in Figure 4, specifically comprise: the serving BS of subscriber equipment and switch aim base station, and intermediate entities and the target BS information acquisition unit that is arranged in the serving BS; Described intermediate entities is used for providing target BS information to described serving BS unification, the target BS information of soon obtaining from each base station is respectively once issued serving BS by a piece of news, and wherein target BS information is to obtain by carrying out information interaction with relevant base station; Described target BS information acquisition unit is used for obtaining corresponding target BS information to intermediate entities after described serving BS determines to carry out handover operation.
In the system of the present invention, described intermediate entities can be the universal land radio access web IAD of evolution, and this gateway comprises mobile management entity and user entity; Described intermediate entities can also be the upper layer node on other base stations, as RRM etc.
For rationalizing the realization of system, guarantee that serving BS can be always to the corresponding target BS information of intermediate entities acquisition request when appearance is unusual, therefore, system of the present invention also is provided with corresponding processor in described serving BS, to realize this purpose, specifically can be provided with:
Timer, when the target BS information acquisition unit when intermediate entities is obtained target BS information, pick up counting, if when timer expiry, do not receive target BS information yet, then stop to obtain target BS information to intermediate entities;
Perhaps,
Counter is counted when intermediate entities is obtained target BS information when the target BS information acquisition unit at every turn, does not receive target BS information when Counter Value reaches predetermined value yet, then stops to obtain target BS information to intermediate entities.
In addition, after guaranteeing that switching is finished, the consistency of the contextual information of target BS and source base station also comprises following processing unit in the system of the present invention:
The contextual information updating block is arranged in the serving BS, is used for after handoff procedure is finished current contextual information being sent to target BS, and described contextual information comprises resource allocation information;
The resource updates control unit, be arranged in the target BS, be used for after handoff procedure is finished according to the current contextual information of receiving and before the contextual information that obtains, and predetermined judgment criterion determines whether to carry out resource reconfiguration, and triggers the resource reconfiguration unit when needed;
The resource reconfiguration unit carries out resource reconfiguration operation under the triggering of resource updates control unit.
In sum, realization of the present invention makes intermediate entities such as aGW in handoff procedure, can obtain target BS information etc. in the auxiliary source base station, has reduced source base station directly to obtain the signaling traffic load problem that target BS information is brought; Simultaneously, by the condition that timer etc. stops target BS information is set at source base station, can also reduce the negative effect that intermediate entities such as aGW may cause signaling process in auxiliary handoff procedure.In addition, after switching was finished, intermediate entities such as aGW can also be transmitted latest content on the source base station to target BS, with the contextual information of synchronous target BS and source base station, realized the consistency of business service.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (13)
1. a method that realizes switching in wireless communication system is characterized in that, comprising:
The serving BS of A, subscriber equipment obtains target BS information to intermediate entities after definite subscriber equipment need carry out handover operation; Comprise: after the serving BS of subscriber equipment determines that subscriber equipment need carry out handover operation, then be sent as the request message of acquisition request target BS information to intermediate entities; Described intermediate entities is returned each target BS information that intermediate entities is obtained respectively to this serving BS unification after receiving described request message;
B, described serving BS carry out handover operation according to the described target BS information of obtaining from middle entity;
Described method also comprises:
After target BS was finished switching, the up-to-date contextual information in the serving BS of determining to obtain comprised resource allocation information in the contextual information;
Determine the comparative result of described up-to-date contextual information and the contextual information that obtains before, afterwards, determine whether that according to predetermined judgment criterion needs initiate the resource distribution operation again, and when needed, initiate the resource distribution processing procedure again.
2. method according to claim 1 is characterized in that, described intermediate entities comprises:
The universal land radio access web IAD of evolution or the upper layer node on the base station, described gateway comprises Mobility Management Entity and user entity.
3. method according to claim 1 is characterized in that, described steps A also comprises:
If serving BS is not received the target BS information that intermediate entities is sent within the predetermined time, then obtain target BS information to intermediate entities again.
4. method according to claim 3 is characterized in that, described steps A also comprises:
If described serving BS is not received the target BS information that intermediate entities is sent yet after satisfying predetermined condition, then stop to obtain target BS information to intermediate entities.
5. method according to claim 4 is characterized in that, described predetermined condition comprises:
Preset time conditional information and/or the predetermined number of times conditional information that obtains target BS information to intermediate entities.
6. method according to claim 1 is characterized in that, described method also comprises:
Serving BS sends to intermediate entities with up-to-date contextual information after obtaining the handoff completion message that target BS sends;
Intermediate entities initiatively sends to target BS with the up-to-date contextual information of the serving BS that obtains.
7. method according to claim 6 is characterized in that, described intermediate entities is also shaken hands by signaling or retransmission mechanism sends the up-to-date contextual information of serving BS to target BS.
8. method according to claim 1 is characterized in that, described judgment criterion comprises: determine to adopt up-to-date contextual information whether can cause the synchronous again of subscriber equipment physical layer.
9. according to each described method in the claim 1 to 5, it is characterized in that described method is applied in the Long Term Evolution LTE system.
10. system of realize switching in wireless communication system comprises it is characterized in that the serving BS and the switch aim base station of subscriber equipment, also comprises:
Intermediate entities is used to receive the request message of described serving BS acquisition request target BS information, and provides each target BS information of obtaining respectively to described serving BS unification;
The target BS information acquisition unit is arranged in the serving BS, is used for obtaining target BS information to intermediate entities after described serving BS determines to carry out handover operation;
The contextual information updating block is arranged in the serving BS, is used for after handoff procedure is finished current contextual information being sent to target BS, and described contextual information comprises resource allocation information;
The resource updates control unit, be arranged in the target BS, be used for after handoff procedure is finished according to the current contextual information of receiving and before the contextual information that obtains, and predetermined judgment criterion determines whether to carry out resource reconfiguration, and triggers the resource reconfiguration unit when needed;
The resource reconfiguration unit is arranged in the target BS, carries out resource reconfiguration operation under the triggering of resource updates control unit.
11. system according to claim 10 is characterized in that, described intermediate entities comprises:
The universal land radio access web IAD of evolution or the upper layer node on the base station.
12. system according to claim 11 is characterized in that, the universal land radio access web IAD of described evolution comprises mobile management entity and user entity.
13. system according to claim 10 is characterized in that, described system also comprises:
In described serving BS, also be provided with timer, when the target BS information acquisition unit when intermediate entities is obtained target BS information, pick up counting,, then stop to obtain target BS information to intermediate entities if when timer expiry, do not receive target BS information yet;
Perhaps,
In described serving BS, also be provided with counter, when the target BS information acquisition unit is counted when intermediate entities is obtained target BS information at every turn, when Counter Value reaches predetermined value, do not receive target BS information yet, then stop to obtain target BS information to intermediate entities.
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