CN1794865A - Method of switching terminal between base station - Google Patents
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- CN1794865A CN1794865A CNA2005100749497A CN200510074949A CN1794865A CN 1794865 A CN1794865 A CN 1794865A CN A2005100749497 A CNA2005100749497 A CN A2005100749497A CN 200510074949 A CN200510074949 A CN 200510074949A CN 1794865 A CN1794865 A CN 1794865A
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- 230000000977 initiatory effect Effects 0.000 description 7
- 230000003993 interaction Effects 0.000 description 4
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- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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Abstract
This invention provides a method for switching terminals among base stations including: after the switch is triggered, a service BS sends a piece of pre-informed information to the adjacent BS including the basic needed information of the being switched terminal MSS, after the adjacent BS receives the pre-informed information, it confirms the normal switch time of the MSS and assigns the quick accessed up resource for the MSS and informs it to the MSS, which receives the up resource assigned information sent by a preset final target BS from the adjacent BS to send information to said final target BS to access initially, in which, the target BS determines the normal switch time and assigns fast ranging IE for the MSS when the time is up so that the target BS can assign fast ranging IE in definite time for the MSS to realize quick switch of terminals.
Description
Technical field
The present invention relates to the wireless access wide band technology field, relate to the method that a kind of terminal (MSS) is switched or rather between base station (BS).
Background technology
The IEEE802.16 protocol definition wireless metropolitan area network standard of fixed broadband wireless access (BWA), this standard pin has defined different physical-layer techniques to different frequency range.The range of application of this standard mainly is towards dwelling house, small office/family office (SOHO), teleworker and the user of small enterprise (SME) market.
In the IEEE802.16 agreement, the message interaction process of eating dishes without rice or wine when MSS switches between BS has been described, as shown in Figure 1, may further comprise the steps:
The flow process that the terminal that above-mentioned flow process is the IEEE802.16 agreement to be provided is switched between the base station.Because under normal conditions, target BS is public access-in resource district by the up searching resource of UL_MAP message assignment, the terminal of each new access all sends the request of access at this resource-area to the base station in other words, if the terminal challenge that switches to target BS like this is the terminal of other new accesses only, will cause prolong switching time.Therefore, in the IEEE802.16 agreement, also propose, in order to accelerate switching flow, target BS can be switched the quick ascending resource (Fast RangingIE) that inserts of the MSS assignment of coming for needs, but in the IEEE802.16 agreement, do not illustrate target BS when this FastRanging IE of assignment, so also can't realize the quick switching of terminal.In addition, the flow process among Fig. 1 does not provide in order to finish this switching yet, and serving BS broadcasts and target BS be interactive information how, when is included in concrete mutual what information.And, the method for being initiated switching by terminal only is provided in the prior art, the triggering mode of switching is single.
Summary of the invention
In view of this, the invention provides the method that a kind of terminal is switched between the base station, target BS can be at the time assignment Fast Ranging IE that determines in the method, and can realize the quick switching of MSS.
For achieving the above object, the invention provides the method that a kind of MSS switches between BS, this method may further comprise the steps:
After a, the handover trigger, serving BS BS sends to neighbor bss and switches pre-notification message, and this switches the primary demand information of the terminal MS S that comprises in the pre-notification message that needs switch;
After b, neighbor bss receive and switch pre-notification message, determine the time that the corresponding MSS of this message formally switches, and after this time of arrival, be the ascending resource that this MSS assignment inserts fast, and the ascending resource information of the quick access of assignment be notified to this MSS by ascending resource assignation message;
C, described MSS initially insert by send message to this final goal BS on the ascending resource of this message assignment after receiving the ascending resource assignation message that predetermined final goal BS sends from described neighbor bss.
Described handover trigger can for:
Sending MSS handoff request message trigger by MSS to serving BS broadcasts switches;
Or, and after the service conditions of MSS determines the MSS that need switch to other BS, the MSS that is determined triggered switch by the load balancing strategy and the control algolithm of serving BS broadcasts according to self;
Or by network controller according to load balancing strategy and control algolithm, after determining MSS to be switched to the serving BS broadcasts of other BS, send the handoff request message trigger to the serving BS broadcasts of being determined and switch.
Neighbor bss described in the step b determine time that MSS formally switches can for:
B11, neighbor bss are determined the formal time of switching according to MSS primary demand information in the pre-notification message of switching that receives and self radio resource dispatching strategy.
May further include behind the described step b11:
B12, neighbor bss will be determined formally carries out information and self response message of MSS primary demand information is returned to serving BS broadcasts by switching pre-push-notification-answer information switching time;
After b13, serving BS broadcasts receive the pre-push-notification-answer message of switching that neighbor bss returns, the information in the information of neighbor bss and the corresponding pre-push-notification-answer message of switching is handed down to MSS;
B14, MSS determine final objective BS according to described information after receiving the described information that serving BS broadcasts issues;
Among the described step c, predetermined final goal BS is determined final goal BS among the described step b14 in neighbor bss.
Neighbor bss described in the step b determines that the time that MSS formally switches can comprise:
B21, neighbor bss according to the pre-notification message of switching that receives after, self is returned to serving BS broadcasts to the response message of described MSS primary demand information by switching pre-push-notification-answer information;
B22, serving BS broadcasts are determined the time that this MSS formally switches after receiving the pre-push-notification-answer message of switching that neighbor bss returns, and should the time send to described neighbor bss by handoff notification message;
The time that the time that b23, neighbor bss send serving BS broadcasts is defined as formally switching.
From above scheme as can be seen, definite time of formally switching of target BS among the present invention, and after this time arrives, be MSS assignment Fast Ranging IE, thereby target BS can be MSS assignment Fast Ranging IE in the time of determining, has realized the quick switching of MSS;
Among the present invention, by the time of determining by MSS or serving BS broadcasts formally to switch, and the time of formally switching that will determine send to target BS, make the target BS determine the time of formally switching, guaranteed the operate as normal when MSS is in the serving BS broadcasts scope;
Also by determining the time that MSS formally switches according to self strategy, guaranteed the operate as normal of MSS after switching to target BS among the present invention by target BS;
Among the present invention also by by target BS receive switch pre-notification message after, for distributing, the MSS that initiates to switch takies the HO_ID of resource less than MAC Address, and this HO_ID is sent to serving BS broadcasts by switching pre-push-notification-answer message, serving BS broadcasts sends to MSS again with this HO_ID then, thereby MSS is in the process that inserts target BS, can use this HO_ID to carry out, thereby save FastRanging IE resource;
Serving BS broadcasts is by after receiving the final handover information of confirming of MSS among the present invention, just the target BS to final affirmation sends its time of formally switching of message informing, thereby avoided BS to its initial option, and the final nonoptional BS of MSS sends above-mentioned message, thereby reduced message flow, saved resource;
In addition, the present invention also provides does not respectively have interface to have solution under the situation that can't directly transmit message between different initiation mode and the BS, increased range of application of the present invention.
Description of drawings
The message interaction process figure that Fig. 1 eats dishes without rice or wine when switching between BS for MSS in the IEEE802.16 agreement;
Fig. 2 is an overview flow chart of the present invention;
Fig. 3 is the flow chart of first embodiment of the invention;
Fig. 4 is the flow chart of second embodiment of the invention;
Fig. 5 is the flow chart of third embodiment of the invention;
Fig. 6 is the part flow chart of eighth embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Main thought of the present invention is that after the handover trigger, serving BS broadcasts sends the pre-notification message of switching of the MSS primary demand information that comprises that needs switch to neighbor bss; After neighbor bss receives and switches pre-notification message, determine the time that the corresponding MSS of this message formally switches, and after arriving this time, be the ascending resource that this MSS assignment inserts fast, and the ascending resource information of the quick access of assignment is notified to this MSS by ascending resource assignation message; MSS sends message to this final goal BS on the ascending resource of assignment and initially inserts after the ascending resource assignation message that receives predetermined final goal BS transmission in this message.
Overall procedure of the present invention as shown in Figure 2, concrete steps are as follows:
After step 201, the handover trigger, serving BS broadcasts sends the pre-notification message of switching of the MSS primary demand information that comprises that needs switch to neighbor bss;
After step 202, neighbor bss receive and switch pre-notification message, determine the time that the corresponding MSS of this message formally switches, and after this time of arrival, be the ascending resource that this MSS assignment inserts fast, and the ascending resource information of the quick access of assignment be notified to this MSS by UL_MAP message;
In above-mentioned steps 201, handover trigger can be to be triggered by terminal, also can be by base station triggers, can also be to be triggered by network controller.
In addition, in the present invention, target BS can also take the less switching sign (HO_ID) of resource for the MSS that switches distributes, to save in access procedure mutual resource needed amount between the MSS and target BS.
Below the present invention is described in detail by specific embodiment.
Among first embodiment of the inventive method, switch by MSS and initiate, its flow process as shown in Figure 3,
Concrete steps are as follows:
In this step, MSS can also carry out initial ranging with neighbor bss, and carries out synchronously, so that terminal when switching to certain adjacent base station, accelerates to insert the process of search.Here initial ranging and synchronizing process are same as the prior art, no longer elaborate.
In this step, MSS can trigger switching by the mode of serving BS broadcasts and neighbor bss signal quality relatively, promptly after signal quality that MSS judges serving BS broadcasts is lower than the signal quality of certain neighbor bss, just to serving BS broadcasts transmission MOB_MSSHO_REQ message; Also the mode that can detect by the signal error rate to current reception triggers switching, promptly after the error rate that detects current demand signal reaches the thresholding of determining by emulation or other modes in advance, just sends MOB_MSSHO_REQ message to serving BS broadcasts.
In this step, the switching target BS that serving BS broadcasts is selected may be one, also may be greater than one.If the switching target BS that selects is one, then this target BS is final switching target BS.
Because after serving BS broadcasts is selected switching target BS in step 305, it is MSS assignment Fast RangingIE need to send the HO_Notification message informing to the switching target BS that selects on the one hand, need on the other hand to send the target BS of MOB_BSHO_RSP message informing for its selection to MSS, so can being serving BS broadcasts, above-mentioned steps 306 and step 307 carry out simultaneously, also can be first execution in step 306 execution in step 307 again, can also be first execution in step 307 execution in step 306 again.
Step 310, serving BS broadcasts judge whether the information that comprises in this message is to proceed to switch, if proceed to switch, then execution in step 311 after receiving MOB_HO_IND message; Otherwise execution in step 312.
It is the timer of this MSS reservation of resource that step 311, serving BS broadcasts start predefined, and is released to the resource that this MSS distributes behind timer expiry automatically, and execution in step 313 then.
In this step, serving BS broadcasts judge be to proceed to switch after, can also judge whether the target BS that original serving BS broadcasts is selected is one, start timer and discharge the resource step automatically if then only carry out in overtime back; Otherwise serving BS broadcasts starts timer and discharges the resource step automatically in overtime back except that carrying out, can also determine that serving BS broadcasts selected, but the nonoptional target BS of MSS, and to these BS transmission cancellation switching (HO_Withdraw) message of determining, notify these BS not need to set up Fast Ranging IE for MSS, these BS no longer for MSS sets up Fast Ranging IE, can not issue UL_MAP message to MSS yet after receiving this message.
More than be the description of the flow process of the first embodiment of the present invention, further specify this embodiment by a kind of concrete situation more below.
Suppose that serving BS broadcasts is BS1, the possible target BS that MSS selects in above-mentioned steps 302 comprises BS2 and BS3, be 7 frames definite switching time after, then in step 303, BS1 sends HO_Pre_Notification_Request message to BS2 and BS3 respectively.Suppose again in step 305, the HO_Pre_Notification_RSP message that BS1 returns respectively according to BS2 and BS3, the switching target of selecting is BS3, and this constantly distance receive MOB_MSSHO_REQ message that MSS sends over and done with the time of 4 frames, then in step 307, BS1 only sends HO_Notification message to BS, and the relative time that the initiation that comprises in this message is switched is for to deduct 43 frames that calculate by 7.And BS3 is after receiving HO_Notification message, at the MSS assignment Fast Ranging IE of the 3rd frame for initiating to switch, and Fast Ranging IE information is sent to MSS by UL_MAP message, MSS sends RNG_REQ message to BS3 according to the Fast Ranging IE information in this message and initially inserts after receiving UL_MAP message on the Fast of correspondence Ranging IE.
In the step 301 of present embodiment flow process, MSS is initiating will to scan the signal quality information that obtains these neighbor bss to neighbor bss before the switching, and MSS directly draws together the neighbor bss signal quality information that these obtain in advance in the terminal handoff request message after initiating to switch in step 302 then.But in the present embodiment, can also after initiating switching, just scan by MSS the signal quality of neighbor bss, be specially: in above-mentioned steps 301, MSS receives only the NBR_ADV message that serving BS broadcasts sends, but do not carry out the flow process that scans with the serving BS broadcasts negotiation, and in step 302, MSS is before sending terminal handoff request message to serving BS broadcasts, at first send scan request message to serving BS broadcasts, serving BS broadcasts is after receiving scan request message, issue the scanning response message to MSS, after this information in the sweep spacing that issues in according to scan request message of MSS and the NBR_ADV message that receives in step 301 scans the signal quality information that obtains neighbor bss to neighbor bss, and then carries out the step that sends the terminal handoff request to serving BS broadcasts and trigger and switch.
In the second embodiment of the present invention, still the cycle receives the NBR_ADV message that serving BS broadcasts sends to MSS, in the sweep spacing of consulting to determine with serving BS broadcasts in advance each neighbor bss is carried out scanning survey according to the frequency of the neighbor bss among the NBR_ADV and pilot tone (Preamble Index) information, obtain the signal quality of these neighbor bss.But different with first embodiment in this embodiment is that the MSS cycle is given serving BS broadcasts with the signal quality of these neighbor bss by scanning survey report (MOB_SCAN_Report) information reporting.
Report to serving BS broadcasts on the basis of neighbor bss signal quality at above-mentioned MSS, the flow process of present embodiment as shown in Figure 4, concrete steps are as follows:
In this step, serving BS broadcasts perhaps under the heavier situation of load, need allow certain MSS or certain several MSS switch under the relatively nervous situation of resource.If have only a MSS then only be meant serving BS broadcasts in this flow process and the mutual flow process of this MSS; If several MSS are arranged then serving BS broadcasts and each MSS carry out this flow process carries out alternately.It can be whether to have surpassed predefined thresholding according to current interface-free resources of distributing or current load to judge that serving BS broadcasts judges whether need to switch.The load here mainly is meant the processor resource of BS itself, as the load factor of queue resource, CPU and the information such as port flow of BS back-end network.It then is according to the professional idle condition information of the MSS in self that BS selects to need to switch the MSS that walks, the perhaps precedence information of the Business Stream of MSS, the perhaps signatory class information of the user of MSS, and it is the most idle according to predefined respective threshold selection business, perhaps Business Stream priority is minimum, perhaps the signatory minimum MSS of rank of user.
The MOB_SCAN_Report message that step 402, serving BS broadcasts report according to MSS, the neighbor bss that comprises in this message sends HO_Pre_Notification_Request message.
Different with first embodiment is to be to be determined according to the handover trigger factor of self by serving BS broadcasts the above-mentioned switching time that is included in the handoff notification message.For example handover trigger is because the queue resource in the serving BS broadcasts has reached the handover trigger thresholding of setting, and then BS can determine the time that need formally switch according to the maximum of this formation that guarantees its operate as normal and the maximal rate of formation growth.
More than be the explanation to second embodiment of the invention, the neighbor bss Information Selection that reports according to MSS of serving BS broadcasts sends the neighbor bss of HO_Pre_Notification_Request message in a second embodiment.And in the third embodiment of the present invention, do not report the signal quality information of neighbor bss to serving BS broadcasts at MSS, perhaps serving BS broadcasts does not receive the signal quality information of the neighbor bss that MSS reports, perhaps in serving BS broadcasts, the neighbor bss signal quality information that MSS reports is expired, be that serving BS broadcasts has been deleted or abandoned under the situation of these information, serving BS broadcasts also can be initiated to switch, and below the 3rd embodiment is elaborated.
In addition, in the present embodiment, serving BS broadcasts also can initiatively require MSS that neighbor bss is scanned, and the signal quality information that will scan acquisition reports serving BS broadcasts, be specially: serving BS broadcasts judge need MSS wherein need switch to other BS after, when sending the pre-push-notification-answer message of switching to neighbor bss, also the terminal of switching to needs issues the scanning response message, terminal is after receiving this scanning response message, according to the information in the NBR_ADV message that issues before this scanning response message and the serving BS broadcasts, neighbor bss is scanned, and obtain the signal quality information of these neighbor bss in scanning after, the signal quality information of neighbor bss is reported serving BS broadcasts; Then the signal quality information that serving BS broadcasts is still the neighbor bss of the response message of carrying among the HO_Pre_Notification_RSP that returns according to neighbor bss and terminal to report in step 504 is selected switching target BS.
In the third embodiment of the present invention, identical among the method that serving BS broadcasts initiate to be switched and second embodiment, as shown in Figure 5, the most of step in its flow process is also identical with Fig. 4 among second embodiment, only distinguishing step is described below.
In step 501, serving BS broadcasts is according to self load balancing strategy and control algolithm, and the service conditions of each MSS that is connected with this serving BS broadcasts, judges whether and need switch to other BS by MSS wherein, if execution in step 502 then; Carry out this step otherwise return.Follow-up step 502 is identical with step 402 and step 403 among Fig. 4 with 503, and in step 504, different with step 404 among Fig. 4 is, the information of carrying among the HO_Pre_Notification_RSP that serving BS broadcasts is only returned according to neighbor bss is selected the switching target BS of MSS.
Among above-mentioned first embodiment, initiate to switch, among the second and the 3rd embodiment, initiate to switch by serving BS broadcasts by MSS.Among the present invention, can also initiate to switch, the situation that ASN GW initiates to switch is elaborated below by the 4th embodiment by network controller (ASN GW).
In fourth embodiment of the invention, network controller is according to load balancing strategy and the control algolithm of the BS that is provided with in self, need to judge whether the MSS among certain BS to switch to other BS, if need among this BS then to select the MSS that switches, and the serving BS broadcasts that inserts to the selected MSS that need to switch sends handoff request message, and comprises the MSS information that needs switch and the time of formal switching in this request message; Otherwise, continue to return this step of execution.
Here, it can be resource or the load current according to its each BS that controls that the network control implement body judges whether to need to switch, and whether has surpassed predefined thresholding and has judged.And the time that the method for determining formal switching time also can formally be switched with the MSS that serving BS broadcasts among second embodiment is determined is identical, is promptly determined according to load balancing strategy and the control algolithm of the BS that wherein is provided with by ASN GW.In addition, the mode of the MSS that selection need be switched also with second embodiment in serving BS broadcasts select the mode of the MSS that need switch identical, promptly according to the professional idle condition information of the MSS among the BS, the perhaps precedence information of the Business Stream of MSS, the perhaps signatory class information of the user of MSS, and the most idle according to predefined respective threshold selection business, perhaps Business Stream priority is minimum, perhaps the signatory minimum MSS of rank of user.
Serving BS broadcasts is after the handoff request information that receives ASN GW transmission, according to the MSS information in this message, information with this MSS that stores in self, determine that this MSS switches needed primary demand information, and these information are sent to neighbor bss by HO_Pre_Notification_Request message.The above-mentioned BS that receives handoff request information is the serving BS broadcasts of the MSS that need switch.After this, the flow process of switching can with above-mentioned three embodiment in arbitrary identical, no longer elaborate here.
Serving BS broadcasts is before sending HO_Pre_Notification_Request message to neighbor bss in the 4th embodiment, can judge the signal quality information whether neighbor bss that MSS reports is arranged in the serving BS broadcasts, if the signal quality information of the neighbor bss that MSS reports is arranged in the serving BS broadcasts, then only send HO_Pre_Notification_Request message to neighbor bss, and when select target BS from neighbor bss, the signal quality information of the neighbor bss that reports according to the information among the HO_Pre_Notification_RSP and MSS comprehensively carries out; Otherwise, if there is not the signal quality information of the neighbor bss that MSS reports, then serving BS broadcasts can be after the handoff request information that receives ASN GW transmission, send the scanning response message to MSS, the sweep spacing that notice MSS comprises in this message scans the signal quality that obtains neighbor bss to neighbor bss, and these signal qualitys are reported serving BS broadcasts; After MSS receives the scanning response message, the signal quality information of the neighbor bss that scans and scanning is obtained reports serving BS broadcasts, then serving BS broadcasts is when select target BS from neighbor bss, and still the signal quality information of the neighbor bss that reports according to the information among the HO_Pre_Notification_RSP and MSS comprehensively carries out.
In addition, because in above-mentioned four embodiment, serving BS broadcasts all is before the MOB_HO_IND message that receives the MSS transmission, sending HO_Notification message informing target BS to the target BS of selecting is MSS assignment Fast Ranging IE in advance, if the target BS that this moment, serving BS broadcasts was selected is selected as final objective BS by MSS on the one hand, then serving BS broadcasts need it be MSS assignment Fast Ranging IE to these BS transmissions HO_Withdraw message informing; On the other hand, the information that comprises in the MOB_HO_IND message that may report owing to MSS is switched for no longer proceeding, and serving BS broadcasts also needs to send the HO_Withdraw message informing to the target BS that has sent HO_Notification message, and it is not MSS assignment Fast Ranging IE.In order to save above-mentioned HO_Notification message and HO_Withdraw message, also for further conserve network resources, serving BS broadcasts can just send HO_Notification message after the MOB_HO_IND message that receives the MSS transmission, below by the 5th embodiment it is elaborated.
In the fifth embodiment of the present invention, serving BS broadcasts is after selecting switching target BS, only carry out the step that sends the message of the switching target BS information that comprises selection to MSS, the specific implementation of this step and the flow process before this step can be identical with the arbitrary embodiment among above-mentioned four embodiment.Then, MSS returns MOB_HO_IND message to serving BS broadcasts after the message of the switching target BS information that comprises selection that receives the serving BS broadcasts transmission, if the information that comprises in this message is switched for proceeding.Serving BS broadcasts judges whether this message is switched for proceeding, if the switching target BS then in this message sends the time that its MSS of HO_Notification message informing formally switches after receiving the MOB_HO_IND message that MSS returns; If not then directly finishing this switching flow.
Usually when MSS and target BS initially insert alternately, adopt the sign of the MAC Address of MSS as this MSS.The shared resource of MAC Address is 48 bytes, and shared resource is bigger, and for target BS, the MSS that switches to wherein can be not too many, can use to take the sign of the big MAC Address of resource as MSS.So in the sixth embodiment of the present invention, target BS takies the less switching sign (HO_ID) of resource for the MSS that initiates to switch distributes after receiving HO_Pre_Notification_Request message.Generally, for distributing the resource of 8 bytes, HO_ID can satisfy the demand.Certainly, under special circumstances, for the byte number that HO_ID distributes also can be more some more, for example 10 bytes, or 12 bytes.After target BS will have been distributed HO_ID for the MSS that switches, to inform serving BS broadcasts for the HO_ID that MSS distributes by HO_Pre_Notification_RSP message, serving BS broadcasts sends to corresponding MSS by MOB_BSHO_RSP message with HO_ID again, then this MSS is in the process that initially inserts alternately with target BS, use HO_ID to replace MAC Address, just reduced mutual resource needed amount between MSS and the target BS, thereby target BS can reduce also for the Fast Ranging IE size of switching the MSS distribution of coming.
More than among each embodiment, for the time of formally switching all be by the equipment that initiate to switch, determine as terminal, BS or ASN GW, but in the present invention, the time of formally switching can also be determined by target BS, describe in detail below by the 7th embodiment.
The switching flow of the seventh embodiment of the present invention can be based on above-mentioned six embodiment, and be with the difference of above-mentioned six embodiment, when initiating to switch, no matter be terminal, serving BS broadcasts still is ASN GW, and the uncertain time of formally switching, but by target BS after receiving the HO_Pre_Notification_Request message that serving BS broadcasts sends, primary demand information and self radio resource dispatching strategy according to MSS in this message are determined the time that this MSS can formally switch, and should the time send to serving BS broadcasts by HO_Pre_Notification_RSP message, when this target BS arrived in the time of the formal switching of self determining, be MSS assignment Fast Ranging IE, and send the UL_MAP message that comprises this Fast Ranging IE information to MSS.Serving BS broadcasts sends to the MSS that switches again with time of the formal switching that comprises in this message after receiving the HO_Pre_Notification_RSP message that target BS sends.After MSS receives the time of the formal switching that serving BS broadcasts sends, when selecting final objective BS, can comprehensively carry out by the time of the formal switching of serving BS broadcasts transmission the response message and the above-mentioned target BS of the primary demand information of this MSS according to target BS and these target BS that signal quality, the serving BS broadcasts of each target BS are selected and issued.In addition, serving BS broadcasts does not then need to comprise the time of formal switching again in the HO_Notification message that sends to neighbor bss.
More than each embodiment be based on having interface between the BS, the situation that can directly communicate by this interface.In the present invention, solution under the situation that does not have interface between the BS also is provided, difference with above-mentioned each embodiment in this solution is, in the foregoing description between the BS interactive messages all need to be undertaken alternately by the ASN GW between two BS, below only initiate to switch to example with MSS, be elaborated to carrying out mutual switching flow by ASN GW between the BS by the 8th embodiment, other initiate to switch as BS, ASN GW initiates the idiographic flow of corresponding above-mentioned each embodiment such as switching and employing HO_ID, can realize with reference to above-mentioned each embodiment and the 8th embodiment.
As shown in Figure 6, in step 601, MSS send MOB_MSSHO_REQ message to serving BS broadcasts after, pass through handoff request (HO_REQ) message in step 602 serving BS broadcasts, neighbor bss information that MSS is reported and the primary demand information of MSS notice ASN GW are in step 603, after ASN GW receives HO_REQ message, judge that whether the neighbor bss in this message is the BS of this ASN GW control, if execution in step 604 then; Otherwise execution in step 606.
Here, a plurality of if neighbor bss has, then whether ASN GW judges in the control range of oneself each neighbor bss respectively, for each in the neighbor bss of own control range execution in step 604 all; For each execution in step 606 all of the neighbor bss in own control range not.
In step 604, ASN GW sends the HO_Pre_Notification_Request message of the primary demand information that comprises the MSS that initiates switching to the neighbor bss of oneself controlling, then after step 605 neighbor bss is received the HO_Pre_Notification_Request message of ASN GW, return HO_Pre_Notification_RSP message and give ASN GW, identical among the particular content that is comprised in these message and the front embodiment.
In step 606, ASN GW sends the pre-notice of switching (HO_Pre_Notification) message according to the neighboring AS N GW of information under this neighbor bss of this neighbor bss, the content that comprises in this message is removed outside the content in the above-mentioned HO_Pre_Notification_Request message, also comprises the information of neighbor bss; In step 607, neighboring AS N GW issues HO_Pre_Notification_Request message according to neighbor bss information in this message to corresponding BS after receiving HO_Pre_Notification message; In step 608, neighbor bss returns HO_Pre_Notification_RSP message and gives this neighbor bss affiliated neighboring AS NGW after receiving HO_Pre_Notification_Request message then; In step 609, after neighboring AS N GW receives HO_Pre_Notification_RSP message, return HO_Pre_Notification_RSP message to former ASN GW.
After receiving HO_REQ message, step 610, ASN GW in the predefined time HO_Pre_Notification_RSP message is received, and after this predefined time of arrival, information in the HO_Pre_Notification_Request message that receives is informed serving BS broadcasts by HO_RSP message, in step 611, serving BS broadcasts therefrom selects neighbor bss as the switching target BS that recommends MSS according to the above-mentioned information of carrying in the HO_RSP, is handed down to MSS by MOB_BSHO_RSP message then.
After this, in follow-up flow process, between mutual and target BS and the MSS between MSS and the serving BS broadcasts mutual all with first embodiment in identical, different among interaction flow between the BS and first embodiment, specifically realize with reference to above-mentioned steps 602 to step 611, only need step 602 concrete message to the step 611 is modified in the follow-up flow process of corresponding first embodiment that interactive messages get final product no longer detailed description here between the BS.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1, the method switched between the base station of a kind of terminal is characterized in that this method may further comprise the steps:
After a, the handover trigger, serving BS BS sends to neighbor bss and switches pre-notification message, and this switches the primary demand information of the terminal MS S that comprises in the pre-notification message that needs switch;
After b, neighbor bss receive and switch pre-notification message, determine the time that the corresponding MSS of this message formally switches, and after this time of arrival, be the ascending resource that this MSS assignment inserts fast, and the ascending resource information of the quick access of assignment be notified to this MSS by ascending resource assignation message;
C, described MSS initially insert by send message to this final goal BS on the ascending resource of this message assignment after receiving the ascending resource assignation message that predetermined final goal BS sends from described neighbor bss.
2, method according to claim 1 is characterized in that, described handover trigger is:
Sending MSS handoff request message trigger by MSS to serving BS broadcasts switches;
Or, and after the service conditions of MSS determines the MSS that need switch to other BS, the MSS that is determined triggered switch by the load balancing strategy and the control algolithm of serving BS broadcasts according to self;
Or after determining that according to load balancing strategy and control algolithm needs switch to the serving BS broadcasts of other BS with MSS by network controller ASN GW, send the handoff request message trigger to the serving BS broadcasts of being determined and switch.
3, method according to claim 1 is characterized in that, switches the MSS primary demand information that comprises in the pre-notification message described in the step a and comprises: the bandwidth and the QoS of MSS sign, connection and service flow parameters, ability parameter and needs that needs switch.
4, method according to claim 1 is characterized in that, neighbor bss described in the step b determines that the time that MSS formally switches is:
B11, neighbor bss are determined the formal time of switching according to MSS primary demand information in the pre-notification message of switching that receives and self radio resource dispatching strategy.
5, method according to claim 4 is characterized in that, further comprises behind the described step b11:
B12, neighbor bss will be determined formally carries out information and self response message of MSS primary demand information is returned to serving BS broadcasts by switching pre-push-notification-answer information switching time;
After b13, serving BS broadcasts receive the pre-push-notification-answer message of switching that neighbor bss returns, the information in the information of neighbor bss and the corresponding pre-push-notification-answer message of switching is handed down to MSS;
B14, MSS determine final objective BS according to described information after receiving the described information that serving BS broadcasts issues;
Among the described step c, predetermined final goal BS is determined final goal BS among the described step b14 from neighbor bss.
6, method according to claim 1 is characterized in that, neighbor bss described in the step b determines that the time that MSS formally switches comprises:
B21, neighbor bss according to the pre-notification message of switching that receives after, self is returned to serving BS broadcasts to the response message of described MSS primary demand information by switching pre-push-notification-answer information;
B22, serving BS broadcasts are determined the time that this MSS formally switches after receiving the pre-push-notification-answer message of switching that neighbor bss returns, and should the time send to described neighbor bss by handoff notification message;
The time that the time that b23, neighbor bss send serving BS broadcasts is defined as formally switching.
7, method according to claim 6 is characterized in that, among the described step b22, serving BS broadcasts determines that the step of the time that MSS formally switches is:
MSS determines time of formally switching according to the signal quality information of serving BS broadcasts, and this time is reported serving BS broadcasts; Serving BS broadcasts is defined as the time that this MSS formally switches with this time after receiving the time of formally switching that MSS reports;
Or serving BS broadcasts is determined the time that this MSS formally switches according to self load balancing strategy and control algolithm;
Or ASN GW determines the time that MSS formally switches among this BS according to the BS load balancing strategy and the control algolithm that wherein are provided with, then this time is handed down to serving BS broadcasts; Service is defined as the time that this MSS formally switches with this time after receiving the time of formally switching that BS issues ASN GW.
8, method according to claim 6 is characterized in that, behind the described step b22, further comprises:
MSS sends the switch indicating information that comprises predetermined final goal BS information to serving BS broadcasts, serving BS broadcasts is after receiving this switch indicating information, determine to have sent before the neighbor bss of handoff notification message and non-final goal BS according to the final goal BS information in the switch indicating information, send cancellation to determined neighbor bss then and switch message, notify its cancellation to arrange the ascending resource that inserts fast for MSS.
9, method according to claim 6 is characterized in that, among the described step b22, the time of formally switching is sent to described neighbor bss further comprise before:
After serving BS broadcasts receives the pre-push-notification-answer message of switching that neighbor bss returns, according to the information in the pre-push-notification-answer message of the switching that is received, or the signal quality information of the neighbor bss that reports after scanning is obtained according to the information in the pre-push-notification-answer message of the switching that is received and MSS, from return the neighbor bss that switches the pre-push-notification-answer message, determine one as final goal BS, and the information in the pre-push-notification-answer message of switching that this BS information and this BS are returned is handed down to MSS;
MSS is after the information that receives the serving BS broadcasts transmission, according to these information and self signal quality information that neighbor bss scans acquisition is determined whether to proceed to switch, and the object information of whether proceeding to switch that will determine sends to serving BS broadcasts by switch indicating information;
Serving BS broadcasts judges whether this message is that indication is proceeded to switch, if the time that will formally switch then described in the execution in step b22 sends to the step of described neighbor bss by handoff notification message after receiving switch indicating information; Otherwise directly finish this flow process;
Among the described step b22, should the time send to described neighbor bss and be: should the time send to the final goal BS that described serving BS broadcasts is determined by handoff notification message by handoff notification message.
10, method according to claim 6 is characterized in that, among the described step b22, the time of formally switching is sent to described neighbor bss further comprise before:
The information that serving BS broadcasts directly will be returned in the neighbor bss information of switching pre-push-notification-answer information and the corresponding pre-push-notification-answer message of switching is handed down to MSS, perhaps from the neighbor bss that returns pre-push-notification-answer message, select neighbor bss, and the information in the pre-push-notification-answer message of switching of neighbor bss information that will be selected goes out and correspondence is handed down to MSS greater than one;
MSS is after the reception serving BS broadcasts issues described speech breath, determine whether to proceed to switch according to this information, determine final objective BS if then also scan the neighbor bss signal quality information that obtains, and the result that will determine sends to serving BS broadcasts by switch indicating information according to this information and self;
Serving BS broadcasts judges whether the information in this message is switched for proceeding, if then carry out the described time that will formally switch sends to described neighbor bss by handoff notification message step after receiving this switch indicating information; Otherwise, directly finish this flow process;
Describedly should the time send to described neighbor bss and be: should the time send to the final goal BS that described MSS determines by handoff notification message by handoff notification message.
According to claim 9 or 10 described methods, it is characterized in that 11, the signal quality information that neighbor bss is obtained in described MSS scanning is:
Information in the neighboring broadcast messages that MSS issues according to the serving BS broadcasts that receives in advance before switching and neighbor bss is scanned the signal quality information that obtains neighbor bss with sweep spacing that serving BS broadcasts consults to obtain;
Or in step a, serving BS broadcasts sent the scanning response message to MSS before neighbor bss sends the pre-notification message of switching; MSS according to this message with the information in the neighboring broadcast messages that issues of the serving BS broadcasts that receives in advance, scans the signal quality information that obtains neighbor bss to neighbor bss after receiving this scanning response message.
12, method according to claim 6 is characterized in that, among the described step b22, serving BS broadcasts further comprises after receiving the pre-push-notification-answer message of switching that neighbor bss returns:
After serving BS broadcasts receives the pre-push-notification-answer message of switching that neighbor bss returns, the information in the information of neighbor bss and the corresponding pre-push-notification-answer message of switching is handed down to MSS; MSS determines final objective BS according to described information after receiving the information that serving BS broadcasts issues;
Among the described step c, predetermined final goal BS is the final goal BS that described MSS determines in neighbor bss.
According to claim 5 or 12 described methods, it is characterized in that 13, described information and the information in the corresponding pre-push-notification-answer message of switching with neighbor bss further comprises before being handed down to MSS:
Information in the pre-push-notification-answer message of switching that service is returned according to neighbor bss, or the signal quality information of information in the pre-push-notification-answer message of returning according to neighbor bss of switching and the neighbor bss that reports after wherein the MSS scanning of record is obtained, selection may be as the neighbor bss of switching target BS;
Described information and the information in the corresponding pre-push-notification-answer message of switching with neighbor bss is handed down to MSS and is: serving BS broadcasts is handed down to MSS with the information in the neighbor bss information selected and the corresponding pre-push-notification-answer message of switching;
Then described MSS determines that final objective BS comprises:
MSS judges whether the neighbor bss number in the information that serving BS broadcasts issues is one, if then this neighbor bss is defined as final objective BS; Otherwise the information that MSS issues according to serving BS broadcasts is selected one and is defined as final objective BS from neighbor bss;
Then described in the step c in neighbor bss predetermined final goal BS be: the final goal BS that described MSS determines.
14, according to claim 1 to 10, or arbitrary described method in 12, it is characterized in that among the described step b, neighbor bss further comprises behind the pre-notification message of switching that receives the serving BS broadcasts transmission:
Neighbor bss is that the MSS in the pre-notification message of described switching distribute to switch sign, and should switch to identify and send to serving BS broadcasts by switching pre-push-notification-answer message;
Further comprise before the described step c:
After serving BS broadcasts receives and switches pre-push-notification-answer message, be that the switching sign that MSS distributes is handed down to MSS with neighbor bss in this message;
Among the described step c, MSS sends message to final goal BS to carry out in the initial access process, adopts and switches sign as self identification.
15, method according to claim 14 is characterized in that, identifies as MSS to switch sign in the ascending resource assignation message described in the step b.
16, according to claim 1 to 10, or arbitrary described method in 12, it is characterized in that can't directly transmit message between the BS, the step of carrying out interacting message between the then described BS is:
Transmit leg BS at first sends to message own affiliated ASN GW, the ASN GW of transmit leg is after the message that receives transmit leg BS transmission, judge whether recipient BS is the interior BS of self control range, if then the forwards that directly transmit leg BS is sent is to recipient BS; Otherwise the forwards that transmit leg ASNGW sends transmit leg BS is to the recipient ASN GW under the recipient BS, and recipient ASN GW gives recipient BS with this forwards after receiving the message that transmit leg ASN GW sends again.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100749497A CN100450285C (en) | 2005-06-06 | 2005-06-06 | Method of switching terminal between base station |
| PCT/CN2006/001230 WO2006131067A1 (en) | 2005-06-06 | 2006-06-06 | Method for fast handover between the base stations |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100749497A CN100450285C (en) | 2005-06-06 | 2005-06-06 | Method of switching terminal between base station |
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| CN100450285C CN100450285C (en) | 2009-01-07 |
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| WO (1) | WO2006131067A1 (en) |
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| Publication number | Publication date |
|---|---|
| WO2006131067A1 (en) | 2006-12-14 |
| CN100450285C (en) | 2009-01-07 |
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