CN100382652C - Method of implementing switching mobile station to target base station - Google Patents
Method of implementing switching mobile station to target base station Download PDFInfo
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Abstract
The present invention relates to a method of realizing switching a mobile station to a target base station. A, an MSS modulate scanning request RNG-REQ to a destination BS according to an ascending code modulation method, an RNG-REQ message carries information that whether a DCD/UCD message relative to DCD/UCD and DL_MAP/UL_MAP messages pre-stored in the MSS are consistent, or a DCD/UCD message of the destination BS is not previously obtained; b, the destination BS demodulate the RNG-REQ message via the ascending code modulation method; if the destination BS is determined not consistent or not previously obtained, then go to step c; if true, the destination BS carries out a fast search procedure with the MSS; c, the destination BS transmits the DCD/UCD message relative to the current DL_MAP/UL_MAP message of the destination BS to the MSS in single broadcast; d, the MSS uses the UCD/UCD and DL_MAP/UL_MAP messages to obtain a code modulation method assigned to the MSS and carries out the fast search process with the destination BS.
Description
Technical field
The present invention relates to the handoff technique of system of broadband wireless communication, particularly a kind of travelling carriage (MSS) of realizing switches to the method for target BS (BS).
Background technology
Fixed broadband wireless inserts standard IEEE 802.16d and has defined different physical-layer techniques at different frequency range, and this fixed broadband wireless inserts the range of application of standard IEEE 802.16d mainly towards dwelling house, small office (SOHO), teleworker and the user of small enterprise markets such as (SME).
Fixed broadband wireless inserts standard IEEE 802.16d and adopts a kind of non-resource future mechanism, and the professional shared downlink resource that BS sends to MSS is by after the BS unified distribution, comes broadcast announcement MSS's by downlink resource allocations figure (DL_MAP) message.Similarly, the professional shared ascending resource that MSS sends to BS also is by after the BS unified distribution, comes broadcast announcement MSS's by uplink resource allocation figure (UL_MAP) message.
Fixed broadband wireless inserts resource allocation that standard IEEE 802.16d indicates current BS radio frames by DL-MAP message and UL-MAP message as shown in Figure 1, and Fig. 1 inserts time division duplex (TDD) the system frame structure schematic diagram of standard IEEE 802.16d for fixed broadband wireless: it is synchronous that the lead code (Preamble) in this TDD system-frame is used for MSS realization downlink frame; Frame control head (FCH) is broadcast code modulation mode and the message-length partly that is used for indicating this TDD system-frame, is convenient to the correct demodulation broadcast of MSS part; The broadcast part can comprise DL_MAP message, UL_MAP message, down channel descriptor (DCD) and upstream channel descriptor (UCD), wherein, DL_MAP message carries downlink resource call number (DIUC), the code modulation mode that is used for indicating downlink, UL_MAP message carries ascending resource call number (UIUC), be used to indicate up code modulation mode, the broadcasting of DCD/UCD message cycle is used to carry the mapping relations between the employed concrete code modulation mode of DIUC/UIUC and up-downgoing; The data cell of descending transmission (DL Burst PDU) part is carried and will be sent downlink data packet; The data cell of up transmission (UL Burst PDU) part is used to specify terminal and sends the upstream data bag in the corresponding moment.
DL_MAP/UL_MAP message is also carried counting (Count) value of its associated DCD/UCD message respectively, when MSS receives the DL_MAP/UL_MAP message that BS broadcasts, can the DIUC/UIUC that carries of storage DL_MAP/UL_MAP, and the associated DCD of current DL_MAP and UL_MAP message and the Count value of UCD message.Correspondingly, the BS periodic broadcast issues carries in the DCD/UCD message of DIUC/UIUC and concrete code modulation mode mapping relations, also carries DCD counting (Chang Count) value/UCD Chang Count value.When MSS receives the DCD/UCD message of this periodic broadcasting, then the mapping relations between the code modulation mode of the DIUC/UIUC that carries of DIUC/UIUC that carries according to DL_MAP/UL_MAP message and DCD/UCD message and up-downgoing determine that BS distributes to MSS up-downgoing resource.
In order to realize the continuous transmission of wireless communication system business under mobile environment, fixed broadband wireless inserts and has introduced the notion of switching among the standard IEEE 802.16e.Simultaneously, in order to accelerate switch speed as much as possible, MSS is when switching to target BS, target BS can be arranged search (FastRanging) chance fast for MSS in advance, reserve ascending resource to MSS, thereby the MSS switch speed is accelerated in the delay that can not cause MSS to switch because of the competition of MSS.
At present, realize that flow chart that MSS switches to target BS fast is as shown in Figure 2:
The serving BS broadcasts at step 200, the current place of MSS is broadcasted neighboring broadcast messages (NBR-ADV) message to MSS, this message carries the DCD/UCD message with the serving BS broadcasts neighbor bss, and this DCD/UCD message is carried mapping relations and the DCD/UCD message Chang Count value between the code modulation mode of DIUC/UIUC and up-downgoing;
Because the DCD/UCD whether NBR-ADV message carries with the serving BS broadcasts neighbor bss is optionally, decide by serving BS broadcasts, so NBR-ADV message also can not carried the DCD/UCD message with the serving BS broadcasts neighbor bss;
It will switch to the DCD/UCD message of target BS the NBR-ADV message stores that step 201, MSS are broadcasted according to serving BS broadcasts;
Step 202, MSS move to target BS, and target BS is to MSS broadcasting DL_MAP/UL_MAP message, and this message is carried the Change Count value of the current associated DCD/UCD message of DIUC/UIUC and DL_MAP/UL_MAP;
Because before MSS moves to target BS, serving BS broadcasts is determined the target BS that MSS will switch to according to the measured received signal to noise ratio situation of MSS that MSS reports, serving BS broadcasts sends the message that MSS will switch to target BS to target BS, target BS receive this message in advance the assignment ascending resource give MSS;
Step 203, MSS switch to after the target BS, DCD/UCD message is according to the DCD/UCD message of target BS, the code modulation mode of the up-downgoing that the DIUC/UIUC that definite DL_MAP/UL_MAP message that receives is carried is indicated is promptly determined the up-downgoing code modulation mode that target BS is used to assignment;
The ascending resource that step 204, MSS arrange by target BS sends search request message (RNG-REQ) to target BS;
Step 205, target BS are searched for (Ranging) process with MSS after receiving this searching request, finish the Initial R anging process in the handoff procedure of MSS, and send the response message (RNG-RSP) of searching request to MSS.
In step 200 and step 201, MSS also can utilize following manner to obtain switching to the DCD/UCD message of target BS: MSS to utilize sweep spacing and target BS to enter (Association) process alternately before switching, in this process, MSS and target BS realize storing after the DCD/UCD message that receiving target BS is broadcasted synchronously.
Realize that schematic diagram that MSS switches to target BS fast as shown in Figure 3: BS1 is MSS current service BS, and MSS receives the NBR_ADV message that BS1 issues in the n frame, therefrom the MSS DCD/UCD message that obtains and stored neighbor bss.At the n+5 frame, MSS has been because the arrival of handoff threshold has been initiated handoff request by terminal handoff request MOB_MSSHO_REQ message to BS1, and carries the received signal to noise ratio situation of the neighbor bss that MSS measures.At the n+6 frame, BS1 judges and the target BS of the MSS switching of having made a strategic decision is BS3, by base station handoff response MOB_BSHO_RSP message informing MSS.As replying, at the n+7 frame, MSS sends to switch and indicates MOB_HO_IND message indication BS1 to prepare to switch, before this sometime, BS1 can notify BS3 by backbone network, informs that MSS will switch to BS3, and mutual certain operations information, search and the access procedure of quickening MSS and BS3.At the n+13 frame, just BS3 receives after the notice of BS1, initiatively behind ascending resource of assignment, determine the DIUC/UIUC that MSS uses, broadcast by DL_MAP/UL_MAP message, MSS receives the DCD/UCD message of back according to the BS3 that stores in advance, determines the indicated up code modulation mode of UIUC that the UL_MAP message that receives is carried, thereby determine the ascending resource of use, send RNG-REQ to BS3.At the n+14 frame, after BS3 receives RNG-REQ, the indicated up code modulation mode that adopts DL_MAP message to carry, DIUC sends RNG-RSP to MSS, and MSS switches to BS3.
The process that switches to target BS fast by present realization MSS as can be seen, fixed broadband wireless inserts the resource allocation mechanism of standard IEEE 802.16 and indicates the up-downgoing resource respectively by DL_MAP/UL_MAP message.Therefore, though MSS may pass through NBR-ADV message or obtain the DCD/UCD message of neighbor bss by the Association process of MSS and neighbor bss before moving to target BS, and might just switch to adjacent BS by MSS, thereby MSS can determine that according to the DCD/UCD message and the current DL_MAP/UL_MAP message of broadcasting of target BS of target BS target BS is the up-downgoing code modulation mode that the assignment of MSS institute is used according to the DCD/UCD message of the target BS of storing in advance after switching to target BS in theory.But, in practical operation, MSS is very possible can't be according to the DCD/UCD message and the current DL_MAP/UL_MAP message of broadcasting of target BS of the target BS of storage determine that target BS is the up-downgoing code modulation mode of MSS institute assignment in advance after switching to target BS.Cause the reason of this situation to have two: first, the target BS that MSS chooses at last not in the Neighboring Cell List of neighboring broadcast messages NBR-ADV, thereby can't obtain the DCD/UCD message of target BS by neighboring broadcast messages NBR_ADV; Second, the DCD/UCD message of target BS be periodic broadcasting and can upgrade, though therefore MSS may obtain the DCD/UCD message of target BS by the Association process that may exist before NBR-ADV message or the switching before switching to target BS, but in the process before MSS switches to target BS, target BS might have been upgraded DCD/UCD message fully, just upgraded the mapping relations between DIUC/UIUC and the concrete up-downgoing code modulation mode, thereby made MSS determine that correctly target BS is the mapping relations of the DIUC/UIUC and the concrete code modulation mode of institute's assignment in the MSS up-downgoing resource of distributing according to the DCD/UCD message of the target BS of storage in advance and the current DL_MAP/UL_MAP message of broadcasting of target BS.
Can't before switching to target BS, obtain the DCD/UCD message of target BS as MSS, the perhaps DCD/UCD message of the target BS of being stored and when switching to that the DCD/UCD message of the current use of target BS is inconsistent after the target BS, can influence the switch speed that MSS switches to target BS: first, MSS can't determine correctly that target BS is the code modulation mode of institute's assignment in the ascending resource that distributes of MSS, thereby can't send RNG-REQ to target BS, and after can only waiting until the DCD/UCD message of the current use of target BS periodic broadcasting, determine employed concrete code modulation mode in the ascending resource again according to the DL_MAP/UL_MAP message that the DCD/UCD message and the target BS of this periodic broadcasting are broadcasted, send RNG-REQ to target BS, because the cycle time of broadcasting DCD/UCD message is long, generally reach 10 seconds, this has influenced the switch speed that MSS switches to target BS greatly; Second, MSS can't determine correctly that target BS is the code modulation mode of institute's assignment in the downlink resource that distributes of MSS, thereby can't receive the downstream message and the downlink data that send to MSS from target BS, as RNG-RSP, and serving BS broadcasts may need to send to undecided (pending) business data packet of MSS by target BS in handoff procedure, MSS also can't receive, and after can only waiting until the DCD/UCD message of the current use of target BS periodic broadcasting, determine employed concrete code modulation mode in the downlink resource again according to the DL_MAP/UL_MAP message that the DCD/UCD message and the target BS of this periodic broadcasting are broadcasted, thereby downstream message and downlink data that correct receiving target BS sends, this also can influence the switch speed that MSS switches to target BS greatly.
Therefore, how in practical operation, solve because the DCD/UCD message of target BS update cycle broadcasting causes the problem that MSS can't switch fast according to the DCD/UCD message that switches to the target BS of storage before the target BS and solves the problem that can't switch fast because MSS switches to that target BS does not obtain the DCD/UCD message of target BS before, real realization MSS switches to target BS fast, guarantee the reliable transmission of data, become problem demanding prompt solution.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of and realizes that in handoff procedure MSS switches to the method for target BS, this method can solve DCD/UCD message owing to target BS update cycle broadcasting and cause the problem that MSS can't switch fast according to the DCD/UCD message that switches to the target BS of storage before the target BS and can solve the problem that can't switch fast because MSS switches to that target BS does not obtain the DCD/UCD message of target BS before, and realization MSS switches to target BS fast in practical operation.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
A kind of mobile station MS S that realizes switches to the method for target BS BS fast, and up code modulation mode is set, and this method also comprises:
After a, MSS modulate searching request RNG-REQ by the up code modulation mode that sets in advance, send to target BS, whether consistent this RNG-REQ message carried the associated DCD/UCD message of the downlink and uplink resource allocation map DL_MAP/UL_MAP message of down channel descriptor DCD/ upstream channel descriptor UCD that MSS stores in advance and target BS current broadcast information or do not obtained the information of the DCD/UCD message of target BS in advance;
The RNG-REQ message that b, target BS are received by the up code modulation mode demodulation that sets in advance, according to the information of carrying in the RNG-REQ message, determine that the associated DCD/UCD message of the DL_MAP/UL_MAP message of DCD/UCD message that MSS stores in advance and target BS current broadcast is whether consistent or do not obtain the DCD/UCD message of target BS in advance, if it is inconsistent or do not obtain the DCD/UCD message of target BS, then execution in step c in advance; Otherwise, after target BS and MSS carry out quick search procedure, send search response RNG-RSP to MSS;
C, target BS send the associated DCD/UCD message of the current DL_MAP/UL_MAP message of target BS initiatively for the MSS clean culture;
D, MSS receive the DCD/UCD message that the target BS clean culture sends, use the DL_MAP/UL_MAP message of this DCD/UCD message and target BS broadcasting to obtain the code modulation mode that target BS is distributed to the up-downgoing of this MSS, after carrying out quick search procedure with target BS, target BS sends RNG-RSP to MSS.The up code modulation mode of described setting is the up code modulation mode of lowest-order.
The up code modulation mode of described setting is the up code modulation mode that MSS uses in serving BS broadcasts;
The described target BS of step b by the process of the up code modulation mode demodulation RNG-REQ that sets in advance is:
B1, serving BS broadcasts send to target BS with the up code modulation mode that MSS uses in serving BS broadcasts;
The RNG-REQ message that the up Fast_Ranging_IE that the up code modulation mode demodulation that b2, target BS utilize MSS to use in serving BS broadcasts distributes by target BS from MSS sends.
The mode that described this RNG-REQ of step a carries information is:
Whether consistent terminal be provided with DCD/UCD message indication DCD/UCDChang Indication in RNG-REQ message, the associated DCD/UCD message of DCD/UCD message of storing in advance as MSS and the current DL_MAP/UL_MAP message of target BS inconsistent or when not obtaining the DCD/UCD message of target BS in advance at all, is changed to 1 for DCD/UCD Chang Indication information field; When the associated DCD/UCD message of the DCD/UCD message of storing in advance as MSS and the current DL_MAP/UL_MAP message of target BS is consistent, be changed to 0 for DCD/UCD Chang Indication information field.
The mode that described this RNG-REQ of step a carries information is:
At RNG-REQ the TLV encoding domain is set, DCD/UCD message and associated inconsistent information of DCD/UCD message or the basic information that does not obtain the DCD/UCD message of target BS in advance of the current DL_MAP/UL_MAP message of target BS that MSS stores are in advance passed through the TLV encoding setting in RNG-REQ message.
Before step a, this method also comprises: whether the associated DCD/UCD message of the DCD/UCD message that MSS judges the target BS of storage in advance and the current DL_MAP/UL_MAP message of target BS the consistent or basic DCD/UCD message that does not obtain target BS in advance, if inconsistent or do not obtain the DCD/UCD message of target BS in advance, then the described RNG-REQ message of step a is carried the DCD/UCD message that MSS stores in advance and the associated inconsistent information of DCD/UCD message of DL_MAP/UL_MAP message of target BS current broadcast at all, perhaps do not obtain the information of the DCD/UCD message of target BS in advance; If consistent, then the described RNG-REQ message of step a is carried the DCD/UCD message that MSS stores in advance and the associated consistent information of DCD/UCD message of DL_MAP/UL_MAP message of target BS current broadcast.
MSS judges whether consistent process is for the DCD/UCD message of the target BS of storing in advance and the associated DCD/UCD message of DL_MAP/UL_MAP message of target BS current broadcast: compare the DCD Change Count and the UCD ChangeCount that carry in the DL_MAP/UL_MAP message, whether store the DCD Chang Count and the UCDChange Count value of carrying in the DCD/UCD message in advance identical, if it is identical, then consistent, if it is inequality, then inconsistent.
Described up code modulation mode is arranged among the quick searching resource Fast_Ranging_IE of target BS distribution
The Fast_Ranging_IE that the described RNG-REQ of step a distributes by target BS sends.
From such scheme as can be seen, method provided by the invention will be through two steps: first step, after MSS moves to target BS, send RNG-REQ to target BS by predefined up code modulation mode modulation, RNG-REQ carries DCD/UCD message and current associated inconsistent information of DCD/UCD message or the basic information of not storing the DCD/UCD message of target BS in advance of DL_MAP/UL_MAP message that is used to broadcast up-downgoing resource allocation and code modulation mode of target BS that MSS stores in advance, target BS begins to carry out the handoff procedure of MSS by predefined up this search request message of code modulation mode demodulate reception RNG-REQ; Second step, the inconsistent information that target BS obtains mentioning the first step in RNG-REQ message or do not store the information of DCD/UCD message of target BS in advance at all after, send the current DCD/UCD message of target BS for this terminal clean culture, MSS just can determine the mapping relations of target BS between the call number of up-downgoing coded modulation call number specified in the DL_MAP/UL_MAP message and concrete code modulation mode according to the DCD/UCD message that receives, thereby can carry out Fast Ranging process with target BS, and the search response message RNG-RSP of receiving target BS transmission, finish the quick switching of MSS.Because the present invention is in step 2, even the inconsistent or basic DCD/UCD message of not storing target BS in advance of the DCD/UCD message of DCD/UCD message that MSS stores in advance and the broadcasting of target BS current period, do not need to wait for the arriving of the periodic broadcasting DCD/UCD message of target BS yet, reduced the switching time of MSS.Therefore, method provided by the invention has solved DCD/UCD message owing to target BS update cycle broadcasting and has caused the problem that MSS can't switch fast according to the DCD/UCD message that switches to the target BS of storage before the target BS and solved because MSS switches to the problem that does not obtain the DCD/UCD message of target BS before the target BS and can't switch fast, thereby realizes that in practical operation MSS switches to target BS fast.
Description of drawings
Fig. 1 inserts time division duplex (TDD) the system frame structure schematic diagram of standard IEEE 802.16d for fixed broadband wireless.
Fig. 2 switches to the process flow diagram of target BS fast for existing techniques in realizing MSS.
Fig. 3 switches to the schematic diagram of target BS fast for existing techniques in realizing MSS.
Fig. 4 switches to the process flow diagram of target BS fast for the present invention realizes MSS.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, below lift specific embodiment and, the present invention is described in more detail with reference to accompanying drawing.
Switch to fast in the process of target BS at MSS, will be through two steps: first step, when MSS moves to target BS, target BS has initiatively been distributed ascending resource to MSS, be fast uplink searching resource (Fast_Ranging_IE), when MSS moves to target BS, the mapping relations of UIUC in the UCD message of the target BS that may store in advance by the up code modulation mode call number UIUC that carries in the Fast_Ranging_IE and MSS and concrete code modulation mode, use the code modulation mode modulation of UIUC representative to send RNG-REQ to target BS, target BS receives this RNG-REQ; Second step, target BS is carried out adjustment processes such as power and frequency correction according to the RNG-REQ that receives to MSS, finish the quick access in the handoff procedure of MSS, and to MSS transmission RNG-RSP, MSS can be by DIUC and the mapping relations of code modulation mode and the descending DIUC that current goal BS indicates in DL_MAP message among the DCD of target BS of storage in advance, this RNG-RSP message is carried out demodulation, receive target BS and send RNG-RSP.
In these two steps, need MSS before switching to target BS, to obtain the up-to-date DCD/UCD message of target BS, thereby when obtaining the call number DIUC/UIUC of the code modulation mode that target BS carries during descending and ascending resource in assignment, clearly know the concrete code modulation mode of its representative, thereby the message that receives or send is carried out correct coded modulation demodulation, realize that MSS switches to the process of target BS fast.
When the DCD/UCD message that is switching to the target BS of storing before the target BS according to prior art MSS with when the associated DCD/UCD message of the DL_MAP/UL_MAP message that is switching to target BS current period broadcasting after the target BS is consistent, then can finish the process that MSS switches to target BS fast according to Fig. 2 of the prior art, if inconsistent, the process of then being narrated below the present invention is handled.
In order to realize that in a first step MSS obtained target BS and distributes to code modulation mode in the ascending resource of this MSS before switching to target BS, the present invention can preestablish a kind of up code modulation mode, be defined in MSS and switch to target BS fast and carry out in the Fast Ranging process, target BS and MSS use predefined up code modulation mode to receive and send.
Switch to target BS fast at MSS and carry out in the Fast Ranging process, target BS and MSS use predefined up code modulation mode that two kinds of approach are arranged:
1) directly preestablishes a kind of up code modulation mode, when MSS will switch to target BS, when target BS active assignment Fast_Ranging_IE carries out Fast Ranging to terminal, need not carry the UIUC territory, terminal sends RNG-REQ to target BS, the RNG-REQ that target BS also receives from MSS by predefined this up code modulation mode demodulation by predefined up code modulation mode modulation.Consider the robustness of the Radio Link in the wireless communication system, up code modulation mode that can the initialization system lower-order is as QPSK-1/2.
2) when MSS will switch to target BS and carries out quick search procedure, terminal is by sending RNG-REQ to target BS in the last used up code modulation mode modulation of serving BS broadcasts, serving BS broadcasts sends to target BS with MSS at the last up code modulation mode that uses of serving BS broadcasts by the backbone network of wireless communication system in advance, the RNG-REQ that target BS sends from the up MSS that receives by this demodulates information decoding.
When using above-mentioned dual mode, when carrying out the process of Fast Ranging, target BS just there is no need in Fast_Ranging_IE assignment UIUC territory.Even because specified the UIUC territory, MSS switches to target BS, because MSS may not obtain before the UCD of the associated target BS of UL_MAP message this moment, thereby might not know that this UIUC is concrete corresponding with which kind of up code modulation mode, thereby can't finish this Fast Ranging process.Therefore the present invention will be defined in the UIUC territory deletion among the Fast_Ranging_IE that occurs in the UL_MAP message of fixed broadband wireless access standard IEEE 802.16e.
In order to realize that in second step of the present invention MSS obtains the present employed DCD/UCD message of target BS in advance when switching to target BS, finish and search fast process fast, realize the quick switching of MSS, the process that the present invention carries out is as described below.
At first, whether consistent the MSS DCD/UCD message of judging the target BS of storage in advance and target BS are current is used for the resource allocation of broadcast radio frame and or the basic DCD/UCD message that does not obtain target BS in advance whether to the associated DCD/UCD message of the DL_MAP/UL_MAP message of each Resource Block indication code modulation mode index.
Deterministic process is: MSS is before moving to target BS, if obtain the DCD/UCD message of target BS according to the dual mode of prior art, the DCD/UCD message of the target BS of mapping relations between the code modulation mode with DIUC/UIUC and up-downgoing and DCD/UCD message Chang Count value is carried in storage in advance; After moving to target BS, MSS can receive the DL_MAP/UL_MAP message that carries DIUC/UIUC and DCD/UCD message Change Count value that target BS is broadcasted, whether relatively whether the DCD/UCD message Change Count value of carrying in the DL_MAP/UL_MAP message with to store the DCD/UCD message Chang Count value that DCD/UCD message carries in advance identical, just can determine that the DCD/UCD message of storing in advance and target BS are current to be used for the resource allocation of broadcast radio frame and to indicate the associated DCD/UCD message of the DL_MAP/UL_MAP message of code modulation mode index consistent to each Resource Block.
Secondly, send to by first step of the present invention and carry among the RNG-REQ of target BS that DCD/UCD message that MSS stores in advance and target BS are used for the resource allocation of broadcast radio frame and the associated DCD/UCD message of the DL_MAP/UL_MAP message of each Resource Block indication code modulation mode index whether consistent information or the basic information that does not obtain the DCD/UCD message of target BS in advance.
For whether consistent the DCD/UCD message of carrying the target BS that MSS stores in advance and target BS are used for the resource allocation of broadcast radio frame and to the associated DCD/UCD message of the DL_MAP/UL_MAP message of each Resource Block indication code modulation mode index information or the basic information that does not obtain the DCD/UCD message of target BS in advance, the present invention can increase DCD and whether change indication (DCD Chang Indication) in RNG-REQ: if inconsistent, it is 1 that DCD Chang Indication then is set; If consistent, it is 0 that DCD Chang Indication then is set; If do not obtain the information of the DCD of target BS in advance at all, it is 1 that DCD ChangIndication then is set.Similarly, the present invention also can increase UCD message indication (UCD Chang Indication) in RNG-REQ: if inconsistent, it is 1 that UCD Chang Indication then is set; If consistent, it is 0 that UCD Chang Indication then is set; If do not obtain the information of the UCD of target BS in advance at all, it is 1 that UCD Chang Indication then is set.
Whether consistent DCD that MSS stores in advance and target BS are current is used for the resource allocation of broadcast radio frame and to the associated DCD/UCD message of the DL_MAP/UL_MAP message of each Resource Block indication code modulation mode index information or the basic information that does not obtain the DCD/UCD message of target BS in advance in order to carry, the present invention can also increase the TLV encoding domain and realize in RNG-REQ, promptly be used for the resource allocation of broadcast radio frame and inconsistent or when not obtaining the DCD/UCD message of target BS in advance in that the DCD/UCD message of target BS of storage in advance and target BS are current at all, increase the TLV encoding domain and illustrate the associated DCD/UCD message of the DL_MAP/UL_MAP message of each Resource Block indication code modulation mode index.
At last, after target BS receives RNG-REQ message according to first step of the present invention, whether consistent the information that can carry according to RNG-REQ message determined that DCD/UCD message that MSS stores in advance and target BS are current and be used for the resource allocation of broadcast radio frame and or do not obtain the DCD/UCD message of target BS in advance to the associated DCD/UCD message of the DL_MAP/UL_MAP message of each Resource Block indication code modulation mode index at all: if current resource allocation of broadcast radio frame and DCD/UCD the message inconsistent or basic DCD/UCD message that in advance do not obtain target BS associated to the DL_MAP/UL_MAP message of each Resource Block indication code modulation mode index of being used for of DCD/UCD message that MSS stores in advance and target BS, then target BS can send DCD/UCD message for the MSS clean culture according to its other resources condition and algorithm, this DCD/UCD message is carried the mapping relations between the code modulation mode of current DIUC/UIUC and up-downgoing, and MSS no longer needs to wait for the periodic broadcasting of target BS, accelerated the time that MSS switches, MSS uses the DL_MAP/UL_MAP message of the mapping relations of the DIUC/UIUC that defines in this UCD/UCD and concrete code modulation mode and current broadcast can obtain the code modulation mode of the indicated up-downgoing of target BS, and carrying out follow-up MSS handoff procedure needs mutual information and the transmission of finishing pendent up-downgoing business; Be used for broadcast radio frame resource allocation and consistent if the DCD/UCD message that MSS stores in advance and target BS be current to the associated DCD/UCD message of the DL_MAP/UL_MAP message of each Resource Block indication code modulation mode index, then target BS does not process, the mapping relations of DIUC/UIUC that defines in the DCD/UCD message of the target BS that the MSS use is stored in advance and concrete code modulation mode and the DL_MAP/UL_MAP message of current broadcast can obtain the code modulation mode of the indicated up-downgoing of target BS, the transmission of carrying out the information interaction in the MSS handoff procedure and finishing pendent up-downgoing business.
In sum, realize process that MSS switches to target BS fast as described in Figure 4, its detailed process is:
The serving BS broadcasts at step 400, the current place of MSS is broadcasted NBR-ADV to MSS, this message carries the DCD/UCD message with the serving BS broadcasts neighbor bss, have the mapping relations between the code modulation mode of DIUC/UIUC and up-downgoing in this DCD/UCD message, and DCD/UCD message Chang Count value.
The message stores that step 401, MSS broadcast according to serving BS broadcasts its to switch to the DCD/UCD message of target BS.
MSS also can utilize sweep spacing and target BS to enter the Association process, and in this process, MSS and target BS realize storing behind the DCD/UCD that receiving target BS is broadcasted synchronously.
Step 402, MSS move to target BS, target BS is to MSS broadcasting DL_MAP/UL_MAP message, this message is carried the count value DCD/UCD message Change Count of the associated DCD/UCD message of DIUC/UIUC, DL_MAP/UL_MAP message, and carries the Fast_Ranging_IE that distributes to MSS in UL_MAP message.
Step 403, the DCD/UCD message that MSS judges the target BS of storage in advance and target BS be current be used for the resource allocation of broadcast radio frame and to the associated DCD/UCD message of the DL_MAP/UL_MAP message of each Resource Block indication code modulation mode index whether consistent or basic do not store the DCD/UCD message of target BS in advance after, use predefined up code modulation mode modulation RNG-REQ, whether consistent this RNG-REQ message carry the associated DCD/UCD message of the band MSS DCD/UCD message of storing in advance and the current DL_MAP/UL_MAP message of target BS information or the basic information that does not obtain the DCD/UCD message of target BS in advance, and the up quick searching resource district that initiatively distributes by target BS sends to target BS.
Judge whether that consistent process is: relatively whether the DL_MAP/UL_MAP message DCD/UCD message Change Count value of carrying is with to store the DCD/UCD message Chang Count value that DCD/UCD message carries in advance consistent.
MSS uses predefined up code modulation mode can adopt two kinds of approach described in the step 1 of the present invention.
The RNG-REQ message that step 404, target BS receive from MSS by predefined up code modulation mode demodulation, determine that the associated DCD/UCD message of DCD/UCD message that MSS stores in advance and the current DL_MAP/UL_MAP message of target BS is whether consistent or do not store the DCD/UCD message of target BS at all in advance according to the information of carrying, if inconsistent or terminal is not stored the DCD/UCD message of target BS in advance at all, then execution in step 405, otherwise execution in step 407.
Target BS uses predefined up code modulation mode can adopt two kinds of approach described in the step 1 of the present invention.
The DCD/UCD message that step 405, target BS send the current use of target BS for the MSS clean culture according to its other resources condition and algorithm, this DCD/UCD message are carried the mapping relations between the code modulation mode of current DIUC/UIUC and concrete up-downgoing.
Step 406, MSS receive DCD/UCD message, use the mapping relations of the DIUC/UIUC that defines in this DCD/UCD message and concrete code modulation mode and DL_MAP/UL_MAP message to obtain the code modulation mode that target BS is distributed to the up-downgoing of using in the up-downgoing resource of this MSS and the corresponding resource-area, search for the Ranging process fast with target BS, and then finish the fast handover procedures of MSS.
Step 407, target BS and MSS carry out the Ranging process, finish the quick search procedure of MSS, and send RNG-RSP to MSS.
Like this, realize that MSS switches to target BS fast, and because MSS has obtained the up-downgoing resource that target BS is distributed to MSS fast, and can send and correct demodulation coding up-downgoing packet, thereby can make MSS and target BS finish handoff procedure fast and can handle the transmission and the reception of pendent up-downgoing business data packet.
Method of the present invention is applicable to not only that the DCD/UCD message owing to target BS update cycle broadcasting that runs in the MSS handoff procedure causes problem that MSS can't switch fast according to the DCD/UCD message that switches to the target BS of storage before the target BS and because MSS switches to the problem that does not obtain the DCD/UCD message of target BS before the target BS and can't switch fast, and is applicable under sleep pattern or the MSS under the idle pulley returns the similar problem that mode of operation runs into.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. realize that mobile station MS S switches to the method for target BS BS for one kind, it is characterized in that up code modulation mode is set, and this method also comprises:
After a, MSS modulate searching request RNG-REQ by the up code modulation mode that sets in advance, send to target BS, whether consistent this RNG-REQ message carried the associated DCD/UCD message of the downlink and uplink resource allocation map DL_MAP/UL_MAP message of down channel descriptor DCD/ upstream channel descriptor UCD that MSS stores in advance and target BS current broadcast information or do not obtained the information of the DCD/UCD message of target BS in advance;
The RNG-REQ message that b, target BS are received by the up code modulation mode demodulation that sets in advance, according to the information of carrying in the RNG-REQ message, determine that the associated DCD/UCD message of the DL_MAP/UL_MAP message of DCD/UCD message that MSS stores in advance and target BS current broadcast is whether consistent or do not obtain the DCD/UCD message of target BS in advance, if it is inconsistent or do not obtain the DCD/UCD message of target BS, then execution in step c in advance; Otherwise, after target BS and MSS carry out quick search procedure, send search response RNG-RSP to MSS;
C, target BS send the associated DCD/UCD message of the current DL_MAP/UL_MAP message of target BS initiatively for the MSS clean culture;
D, MSS receive the DCD/UCD message that the target BS clean culture sends, use the DL_MAP/UL_MAP message of this DCD/UCD message and target BS broadcasting to obtain the code modulation mode that target BS is distributed to the up-downgoing of this MSS, after carrying out quick search procedure with target BS, target BS sends RNG-RSP to MSS.
2. the method for claim 1 is characterized in that, the up code modulation mode of described setting is the up code modulation mode of lowest-order.
3. the method for claim 1 is characterized in that, the up code modulation mode of described setting is the up code modulation mode that MSS uses in serving BS broadcasts; The described target BS of step b by the process of the up code modulation mode demodulation RNG-REQ that sets in advance is:
B1, serving BS broadcasts send to target BS with the up code modulation mode that MSS uses in serving BS broadcasts;
The RNG-REQ message that the up code modulation mode demodulation that b2, target BS utilize MSS to use in serving BS broadcasts is sent from MSS.
4. the method for claim 1 is characterized in that, the mode that described this RNG-REQ of step a carries information is:
Whether consistent terminal be provided with DCD/UCD message indication DCD/UCDChang Indication in RNG-REQ message, the associated DCD/UCD message of DCD/UCD message of storing in advance as MSS and the current DL_MAP/UL_MAP message of target BS inconsistent or when not obtaining the DCD/UCD message of target BS in advance at all, is changed to 1 for DCD/UCD Chang Indication information field; When the associated DCD/UCD message of the DCD/UCD message of storing in advance as MSS and the current DL_MAP/UL_MAP message of target BS is consistent, be changed to 0 for DCD/UCD Chang Indication information field.
5. the method for claim 1 is characterized in that, the mode that described this RNG-REQ of step a carries information is:
At RNG-REQ the TLV encoding domain is set, DCD/UCD message and associated inconsistent information of DCD/UCD message or the basic information that does not obtain the DCD/UCD message of target BS in advance of the current DL_MAP/UL_MAP message of target BS that MSS stores are in advance passed through the TLV encoding setting in RNG-REQ message.
6. the method for claim 1, it is characterized in that, before step a, this method also comprises: whether the associated DCD/UCD message of the DCD/UCD message that MSS judges the target BS of storage in advance and the current DL_MAP/UL_MAP message of target BS the consistent or basic DCD/UCD message that does not obtain target BS in advance, if inconsistent or do not obtain the DCD/UCD message of target BS in advance, then the described RNG-REQ message of step a is carried the DCD/UCD message that MSS stores in advance and the associated inconsistent information of DCD/UCD message of DL_MAP/UL_MAP message of target BS current broadcast at all, perhaps do not obtain the information of the DCD/UCD message of target BS in advance; If consistent, then the described RNG-REQ message of step a is carried the DCD/UCD message that MSS stores in advance and the associated consistent information of DCD/UCD message of DL_MAP/UL_MAP message of target BS current broadcast.
7. method as claimed in claim 6, it is characterized in that, MSS judges whether consistent process is for the DCD/UCD message of the target BS of storing in advance and the associated DCD/UCD message of DL_MAP/UL_MAP message of target BS current broadcast: compare the DCDChange Count and the UCD Change Count that carry in the DL_MAP/UL_MAP message, whether store the DCD Chang Count and the UCD Change Count value of carrying in the DCD/UCD message in advance identical, if it is identical, then consistent, if it is inequality, then inconsistent.
8. the method for claim 1 is characterized in that, described up code modulation mode is arranged among the quick searching resource Fast_Ranging_IE of target BS distribution
The Fast_Ranging_IE that the described RNG-REQ of step a distributes by target BS sends.
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| US9301215B2 (en) * | 2007-01-12 | 2016-03-29 | Nokia Technologies Oy | Apparatus, method and computer program product providing synchronized handover |
| US8204033B2 (en) * | 2007-04-23 | 2012-06-19 | Institute For Information Industry | Relay station, base station, relay method, transmission method, and computer readable medium thereof for use in a multi-hop network |
| CN101389058B (en) * | 2007-09-10 | 2012-09-05 | 中兴通讯股份有限公司 | Method for processing downlink broadcast message in radio communication system |
| CN101272632B (en) * | 2008-05-08 | 2010-07-28 | 上海交通大学 | Broadcast multicast data transfer method based on breadth re-modulation in passive optical network |
| CN102625390B (en) * | 2011-02-01 | 2016-03-09 | 华为技术有限公司 | Method, terminal and serving BS that a kind of terminal switch and indicating terminal switch |
| CN102076042B (en) * | 2011-02-01 | 2013-08-07 | 华为技术有限公司 | Method for switching terminal, and terminal |
| CN102333356B (en) * | 2011-08-03 | 2014-06-25 | 中国联合网络通信集团有限公司 | Service cell selection method, wireless network controller and access network system |
| CN103052074A (en) * | 2011-10-12 | 2013-04-17 | 中兴通讯股份有限公司 | Method and device for reducing uplink co-channel interference |
| CN103096255B (en) * | 2013-01-11 | 2016-05-11 | 大唐移动通信设备有限公司 | A kind of broadcast message sending method and a kind of base station |
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| JP2003230167A (en) * | 2002-02-04 | 2003-08-15 | Ntt Docomo Inc | Mobile communication terminal and connection method possible to connect with ad hoc network |
| WO2004010629A2 (en) * | 2002-07-19 | 2004-01-29 | Nokia Corporation | Method and system for handovers using service description data |
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| JP2003230167A (en) * | 2002-02-04 | 2003-08-15 | Ntt Docomo Inc | Mobile communication terminal and connection method possible to connect with ad hoc network |
| WO2004010629A2 (en) * | 2002-07-19 | 2004-01-29 | Nokia Corporation | Method and system for handovers using service description data |
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