CN101345987A - Method and base station for implementing fast switch-over in communication network - Google Patents
Method and base station for implementing fast switch-over in communication network Download PDFInfo
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- CN101345987A CN101345987A CNA2007101187354A CN200710118735A CN101345987A CN 101345987 A CN101345987 A CN 101345987A CN A2007101187354 A CNA2007101187354 A CN A2007101187354A CN 200710118735 A CN200710118735 A CN 200710118735A CN 101345987 A CN101345987 A CN 101345987A
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Abstract
The invention relates to a method for implementing rapid switch and base station thereof. The method mainly comprises: first, service base station selects a target base station for the mobile terminal to be switched, or select a corresponding alternative target base station at the same time, and the target base station, or the target base station and the alternative target base station, distributes special switch resource for the mobile terminal; then, the mobile terminal can execute switching operation using the special switch resource to access to the corresponding target base station or the alternative target base station. Thus, the execution of the invention embodiment can do without selecting target base station again while the target base station rejects access, reduces the time cost in the switching curse, and improves the reliability of the switching curse at the same time. To sum up, the execution of the invention embodiment can reduce the switch delay as far as possible while ensuring the switch reliability to satisfy the requirement to switch delay of wireless communication system.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of implementation of quick switching.
Background technology
In wireless communication procedure, because the mobility of travelling carriage makes it to switch between different base stations, to obtain preferable communication performance.
At present, travelling carriage switches the processing procedure prepared as shown in Figure 1 between BS (base station), mainly can may further comprise the steps:
In actual handoff process, above-mentioned steps 2 and step 3 also can be saved;
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
Serving BS broadcasts need send handoff request to a plurality of candidates' target BS in handoff preparation phase, causes need spending the long processing time in handoff preparation phase;
And, because the handoff preparation phase serving BS broadcasts need be carried out alternately with a plurality of candidates' target BS, make a plurality of candidates' target BS to prepare resource, and then may cause the required processing time of MS handoff procedure further to be extended for MS switching in the future.
In a word, the hand-off process scheme that above-mentioned prior art provides, making in the handoff procedure may be because of needed switching time of the long switching delay requirement that can't satisfy system, especially can't satisfy the switching requirement of the travelling carriage that the communication system high speed moves.
Summary of the invention
Embodiments of the invention provide and have realized fast switching method and base station in a kind of communication network, to save the time that takies in the handoff procedure, reduce the switching delay of wireless communication system.
The embodiment of the invention provides in a kind of communication network and has realized fast switching method, comprising:
Serving BS is that to be switched portable terminal is selected a target BS according to quality of service information and/or wireless resource information,
Serving BS is carried out according to selection result notice portable terminal and is switched.
The embodiment of the invention provides a kind of base station, comprising:
The target BS selected cell, being used for according to quality of service information and/or wireless resource information is that to be switched portable terminal is selected a target BS;
The switching notice unit is used for carrying out switching according to the selection result notice portable terminal of described target BS selected cell.
The technical scheme that is provided by the embodiment of the invention described above as can be seen, owing to only selected a target BS for portable terminal according to quality of service information and/or wireless resource information, and this selection result is more accurate, thereby make the selection that need not to carry out once more target BS in the handoff procedure, effectively reduce the time that spends in the handoff procedure, can also improve the reliability of handoff procedure simultaneously.In a word, the realization of the embodiment of the invention can reduce switching delay as far as possible on the basis that guarantees the switching reliability, to satisfy the requirement of wireless communication system to switching delay.
Description of drawings
The processing procedure schematic diagram that Fig. 1 prepares for the switching that provides in the prior art;
The specific implementation processing procedure schematic diagram one that Fig. 2 provides for the embodiment of the invention;
The specific implementation processing procedure schematic diagram two that Fig. 3 provides for the embodiment of the invention;
The implementation structure schematic diagram of the device that Fig. 4 provides for the embodiment of the invention.
Embodiment
In the embodiment of the invention, serving BS in the wireless communication system is to be that MS selects to determine corresponding target BS according to quality of service information and/or wireless resource information, perhaps, also can select to determine target BS and alternative target base station simultaneously according to quality of service information and/or wireless resource information, thereby make that the selection result of target BS or alternative target base station is relatively accurate, to improve handover success rate and reliability.
In the embodiment of the invention, can also be by selected target BS, perhaps private resource is switched in target BS and alternative target base station for this MS distributes, as being the special-purpose range measurement resource of MS preparation, so that MS utilizes described switching private resource to realize handover operation.
The embodiment of the invention specifically can but be not limited to be applied in the IEEE802.16 wireless communication system.
In above-mentioned processing procedure, serving BS specifically can switch decision according to making at one in the current QoS class information that can support of scanning result (being the measurement report of adjacent base station), MS ability, the MS of adjacent base station current qos requirement, the wireless resource information such as load information of adjacent base station, adjacent base station or multinomial combination, with the to be switched target BS of decision MS, perhaps, determine corresponding target BS and alternative target base station.Wherein, the wireless resource information such as load information of adjacent base station can adopt the mode of periodicity or Event triggered to obtain from upper layer network equipment by serving BS.
In handoff procedure, target BS can pass to serving BS with the switching dedicated resource information of described switching private resource correspondence, and should switch dedicated resource information by serving BS and pass to portable terminal; Perhaps, also can directly described switching dedicated resource information be passed to portable terminal by target BS.For example, at target BS or alternative target base station is after MS prepares special-purpose switching private resource, target BS or alternative target base station can utilize the range measurement resource information of the special use of the range measurement resource correspondence that separately broadcast (as UL-MAP (up mapping) message etc.) should special use to be notified to MS as switching dedicated resource information, perhaps, also can utilize the range measurement resource information that switch indicating information should special use to be transmitted to MS by serving BS as switching dedicated resource information.
Carry out in the handover operation process at MS, MS can decide switching time in its sole discretion after receiving the switch indicating information that serving BS sends, perhaps, also can after receiving the switch indicating information that serving BS sends, switch immediately, perhaps, the time that the time that the MS that also can be after receiving the switch indicating information that serving BS sends notifies in according to this message switches determines to carry out handover operation.
In the embodiment of the invention, at serving BS is after portable terminal is selected the alternative target base station, serving BS can also be notified described target BS with the sign of described alternative target base station, like this, after target BS refusal handoff request, this target BS just can notify described alternative target base station to handle this handoff request, thereby further improves the reliability of switching, and reduces switching delay; Perhaps, selecting the serving BS of alternative target base station for portable terminal also can be after knowing that portable terminal can't switch to described target BS, directly with described alternative target base station communication, portable terminal is switched to this alternative target base station, reliability so that further raising is switched reduces switching delay.
For ease of the understanding to the embodiment of the invention, will be example with several concrete Application Examples below be described further the specific implementation of the embodiment of the invention.
Embodiment one
In this embodiment one, serving BS only is that MS selects a to be switched target BS, and is not that MS selects the alternative target base station when making the switching decision.
As shown in Figure 2, in this embodiment, handoff process specifically can may further comprise the steps:
Serving BS specifically can but be not limited to switch decision according to making at one in wireless resource information such as the current qos requirement of scanning result, MS ability, the MS of adjacent base station, the load information of adjacent base station and the current QoS class information that can support of adjacent base station or multinomial combination, thereby determine the to be switched target BS of MS;
For optimization utilizes whole Internet resources, serving BS broadcasts specifically can comprehensively above each factor determine only switching target (being target BS), the switching target that this switching target is not necessarily optimum when making the switching decision; For example, if the qos requirement of current MS is lower, the transmission rate of requirement is lower, does not then need MS is switched on the BS that high-grade QoS can be provided, and upward gets final product and only switch to the BS that can satisfy its QoS demand.
For example, target BS is after MS has prepared special-purpose range measurement resource, it can utilize the range measurement resource information of the special use of the range measurement resource correspondence that broadcast (as UL-MAP message etc.) should special use to be notified to MS, also can by serving BS should special use range measurement resource information be transmitted to MS;
Alternatively, in this switching response message, can carry the range measurement resource information of the special use of preparing as the corresponding dedicated resource information of switching, so that the range measurement resource information of described special use can be transmitted to MS by serving BS into MS.
After step 5, serving BS receive the switching response message of target BS, then send switch indicating information to MS, MS switches with notice;
Wherein, if comprise its range measurement resource information in the switching response message that target BS is sent for the special use of MS preparation, then serving BS can also carry the range measurement resource information that target BS is the special use of MS distribution at this in the switch indicating information that MS sends, make MS can know corresponding access information, promptly obtain the corresponding dedicated resource information of switching;
Alternatively, the time that serving BS can also notify MS to switch in this switch indicating information, the time of specifically carrying out switching with instruct MS;
In this step, described switch indicating information specifically can adopt MOB-BSHO-REQ (the handoff request message among the IEEE802.16e (this request is initiated by BS)) or the MOB-BSHO-RSP (message format of the switching response message among the IEEE802.16e (handoff request that this message is initiated at MS by BS) message; That is to say, in this step, can adopt the message format of similar these two message to determine the form of switch indicating information, perhaps, can in these two message, increase the form of corresponding IE (information element) back as described switch indicating information.
In this step, MS can directly obtain described switching private resource (as the range measurement resource of special use) information from target BS, also can obtain corresponding private resource (as the range measurement resource of the special use) information of switching of switching private resource that target BS is its distribution from serving BS indirectly;
In this step, MS carries out the time of handover operation and can determine voluntarily after receiving the switch indicating information that serving BS sends, perhaps, also can after receiving the switch indicating information that serving BS sends, carry out handover operation, the instruct MS of perhaps, also can be after receiving the switch indicating information that serving BS sends carrying in according to message is specifically carried out the time of switching and is carried out handover operation;
Step 7, MS successful switch are behind target BS, and target BS sends handoff completion message to serving BS, so that the notification service base station, MS is handover success.
Embodiment two
In this embodiment two, when serving BS is made the switching decision, be that MS selects a to be switched target BS, also be MS selects an alternative target base station simultaneously.
As shown in Figure 3, in this embodiment, corresponding handoff process specifically can comprise:
Particularly, serving BS can switch decision according to making at one in wireless resource information such as the current qos requirement of scanning result, MS ability, the MS of adjacent base station, the load information of adjacent base station and the current QoS class information that can support of adjacent base station or multinomial combination, with to be switched target BS and the candidate BS of decision MS;
Particularly, in this handoff request message, can carry the ID (sign) etc. of MS context, the desired QoS information of MS and candidate BS;
Target BS is after receiving the handoff request of serving BS, and execution in step 3 is to step 7, and perhaps, execution in step 3 ' is to step 8 ', will describe respectively below:
(1) step 3 to the processing procedure of step 7 comprises:
Target BS can utilize broadcast (as UL-MAP message) will switch corresponding switching private resource (as the range measurement resource of the special use) information of private resource (as the range measurement resource of special use) and be notified to MS, perhaps, also can will switch private resource (as the range measurement resource of special use) information and be transmitted to MS by serving BS;
Alternatively, in this message, can carry corresponding switching private resource (as the range measurement resource of the special use) information of preparing into MS of switching private resource (as the range measurement resource of special use), so that switching private resource (as the range measurement resource of the special use) information that target BS is sent to serving BS sends to MS;
After step 5, serving BS receive the switching response message that target BS sends, send switch indicating information to MS, MS switches with notice;
Wherein, if in the switching response message that target BS is sent, be included as corresponding switching private resource (as the range measurement resource of the special use) information of switching private resource (as the range measurement resource of special use) that MS prepares, then serving BS can carry corresponding switching private resource (as the range measurement resource of the special use) information of switching private resource (as the range measurement resource of special use) that target BS is the MS distribution in switch indicating information, with notice MS;
Alternatively, switch indicating information in this step can be used the message format of MOB-BSHO-REQ or MOB-BSHO-RSP message, and the corresponding IE of increase (information element) carries above-mentioned switching private resource (as the range measurement resource of special use) information in this message;
In this step, MS specifically can directly obtain described switching private resource (as the range measurement resource of special use) information from target BS, perhaps, also can obtain corresponding switching private resource (as the range measurement resource of the special use) information of switching private resource (as the range measurement resource of special use) that target BS is its distribution from serving BS indirectly;
In this step, MS carries out the time of handover operation and can determine voluntarily after receiving the switch indicating information that serving BS sends, perhaps, also can after receiving the switch indicating information that serving BS sends, carry out handover operation, the instruct MS of perhaps, also can be after receiving the switch indicating information that serving BS sends carrying in according to message is specifically carried out the time of switching and is carried out handover operation;
Step 7, MS successful switch are behind target BS, and target BS sends handoff completion message to serving BS, so that the notification service base station, MS is handover success.
The processing procedure of (2) step 3 ' to step 8 ' comprising:
Step 3 ', target BS is refused this handoff request;
Step 4 ', target BS sends handoff request to the alternative target base station;
Particularly, target BS is when making the refusal access, information such as the contextual information of this MS that can receive from serving BS or the desired QoS of MS are transmitted to the alternative target base station by handoff request, and can carry the ID of serving BS in this handoff request;
Step 5 ', target BS sends and switches refuse information to serving BS;
Particularly, after serving BS was receiving the switching refuse information that target BS sends, then serving BS can notify MS to carry out the processing procedure that inserts from the alternative target base station in switch indicating information, with the handover operation of realization based on the alternative target base station;
Step 6 ', after the handoff request that target BS sends is received in the alternative target base station, then be responsible for MS and prepare the corresponding private resource (as the range measurement resource of special use) that switches;
In this step, corresponding switching private resource (as the range measurement resource of the special use) information of the switching private resource of this special use (as the range measurement resource of special use) can send to MS by broadcast (as UL-MAP message etc.) by the alternative target base station, perhaps, also can be transmitted to MS by serving BS;
Alternatively, this step also can be omitted, be that private resource (as the range measurement resource of special use) can not switched for MS distributes in the alternative target base station yet, and can in broadcast, carry out common ranging process by (for example in the UL-MAP message) notice MS, to insert alternative target base station (promptly do not utilize and switch private resource (as the range measurement resource of special use) access target BS).
Step 7 ', MS carries out the access procedure to the alternative target base station;
Be specifically as follows: if MS has received that the alternative target base station that serving BS sends is the special-purpose switchable resource (as the range measurement resource of special use) that MS prepares, then MS utilizes special-purpose switchable resource (as the range measurement resource of special use) to find range, to carry out access procedure; Perhaps, the broadcast that MS reads the alternative target base station (for example: UL-MAP message), distributed switching private resource (special-purpose range measurement resource) if the alternative target base station is MS, then utilized switching private resource (as the range measurement resource of special use) to find range, to carry out access procedure.If private resource (as the range measurement resource of special use) is not switched for MS distributes in the alternative target base station, then MS carries out common ranging process, and to carry out access procedure, promptly the mode that adopts competition to insert switches to the alternative target base station;
The mode of describing among the embodiment before the mode of the time that execution is switched of determining MS can adopt;
Step 8 ', the MS successful switch is behind candidate BS, and target BS sends handoff completion message to serving BS.The notification service base station, MS is handover success.
In the foregoing description one and embodiment two, serving BS is when select target base station or candidate BS, if serving BS and target BS are synchronous, then can be by base station after portable terminal or serving BS or target BS or the candidate BS calculating switching and the timing offset between the portable terminal, afterwards, portable terminal obtain described timing offset and utilize this timing offset realize between itself and base station synchronously.In handoff procedure, if described timing offset is by serving BS or target BS or candidate BS calculating, then serving BS or target BS or candidate BS calculate the described timing offset notice portable terminal of determining with it, for example, can by in the switch indicating information or broadcast (for example: UL-MAP message) carry described timing offset and send to portable terminal, so that portable terminal was adjusted timing offset before carrying out range operation.
The embodiment of the invention also provides a kind of base station, and this base station can be used as serving BS, also can be used as target BS, perhaps, also can be used as the alternative target base station, and its specific implementation structure mainly can comprise following processing unit as shown in Figure 4:
(1) target BS selected cell, being used for according to quality of service information and/or wireless resource information is that to be switched portable terminal is selected a target BS;
Described target BS selected cell specifically comprises:
The parameter information acquiring unit is used for obtaining one or multiple parameters information of the QoS class information of the wireless resource information of the current service quality QoS requirements of scanning result, capacity of mobile terminal, portable terminal at adjacent base station, adjacent base station and the current support of adjacent base station;
The selection operation unit, being used for according to the parameter information that described parameter information acquiring unit obtains is that portable terminal is selected a target BS.
(2) switching notice unit is used for carrying out switching according to the selection result notice portable terminal of described target BS selected cell, inserts corresponding target BS so that portable terminal switches fast.
Alternatively, can also comprise in this base station and switch the private resource allocation units and switch the private resource notification unit, wherein:
Described switching private resource allocation units are used for as target BS the time, switch private resource for this portable terminal distributes, as the range measurement resource that is used to switch etc.;
Described switching private resource notification unit, the switching dedicated resource information that is used for switching private resource correspondence that described switching private resource allocation units are distributed sends described portable terminal to; Specifically can directly notify described portable terminal, perhaps, also can send to described portable terminal by the serving BS transfer by target BS.
Alternatively,, in as the base station of serving BS, can also select the respective alternative target BS for portable terminal for further improving the reliability of switching, so this base station can also comprise base station selected unit of alternative target and switching notice processing unit, wherein:
The base station selected unit of described alternative target is used to be switched portable terminal to select the alternative target base station, so that after portable terminal can't insert target BS, can select to insert this alternative target base station, and to finish corresponding handover operation process;
Described switching notice processing unit is used for after knowing that portable terminal can't switch to described target BS, with described alternative target base station communication, portable terminal is switched to this alternative target base station.
Alternatively, for making portable terminal can obtain to be used for synchronous timing offset, this base station can also comprise timing offset computing unit and timing offset notification unit, wherein,
Described timing offset computing unit is used to calculate base station after the switching and the timing offset between the portable terminal;
Described timing offset notification unit is used for that described timing offset computing unit is calculated the timing offset of determining and notifies described portable terminal.
In sum, in the whole handoff process that the embodiment of the invention provides, the switching decision of a target BS of corresponding selection is based on the load of neighbours base station, the QoS class information of neighbours base station etc. and determines, thereby can effectively improve the reliability of switching, and the delay in minimizing BS and the MS processing and the delay of hand-off execution process, thereby can satisfy the low delay in the handoff procedure, the requirement of high reliability.In a word, the switching implementation procedure that provides of the embodiment of the invention have realize simple, postpone lower, to switch reliability high and do not influence MS and realize advantages such as complexity.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (15)
1, realize fast switching method in a kind of communication network, it is characterized in that, comprising:
Serving BS is that to be switched portable terminal is selected a target BS according to quality of service information and/or wireless resource information,
Serving BS is carried out according to selection result notice portable terminal and is switched.
2, method according to claim 1 is characterized in that, described step for a to be switched target BS of portable terminal selection comprises:
Serving BS is selected a target BS according to one in the QoS class information of the wireless resource information of the current service quality QoS requirements of portable terminal, adjacent base station and the current support of adjacent base station or the multinomial portable terminal that is combined as.
3, method according to claim 1 and 2 is characterized in that, described wireless resource information comprises load information at least.
4, method according to claim 1 is characterized in that, also comprises: serving BS is that to be switched portable terminal is selected the alternative target base station.
5, method according to claim 4 is characterized in that, this method also comprises:
The alternative target base station is that portable terminal distributes the switching private resource;
By self broadcast or will switch the switching dedicated resource information notice portable terminal of private resource correspondence by serving BS.
6, method according to claim 5 is characterized in that, this method also comprises:
Portable terminal reads the broadcast of alternative target base station, determine that the alternative target base station is that portable terminal has distributed the switching private resource if judge, then utilize described switching private resource to switch to the alternative target base station, otherwise the mode that portable terminal adopts competition to insert switches to the alternative target base station.
7, according to claim 4,5 or 6 described methods, it is characterized in that, is that described method also comprised after portable terminal was selected the alternative target base station at serving BS:
Serving BS is notified described target BS with the sign of described alternative target base station, after the target BS refusal handoff request, notifies described alternative target base station to handle this handoff request;
Perhaps,
Serving BS is notified described target BS with the sign of described alternative target base station, after the target BS refusal handoff request, notify described alternative target base station to handle this handoff request, and target BS also pass to the alternative target base station with the contextual information of portable terminal, service quality and/or the serving BS sign that portable terminal requires;
Perhaps,
After serving BS knows that portable terminal can't switch to described target BS, with described alternative target base station communication, portable terminal is switched to this alternative target base station.
8, according to claim 4,5 or 6 described methods, it is characterized in that this method also comprises:
By base station after serving BS or target BS or the calculating switching of alternative target base station and the timing offset between the portable terminal, and with this timing offset notice portable terminal; Perhaps, directly calculate definite described timing offset by portable terminal.
9, according to claim 1,2,4,5 or 6 described methods, it is characterized in that, also comprise:
, this portable terminal switches private resource for distributing by this target BS;
Target BS sends described switching dedicated resource information to described portable terminal, utilizes this switching private resource to carry out handover operation to make portable terminal.
10, method according to claim 9 is characterized in that, described target BS comprises the step that described switching dedicated resource information sends described portable terminal to:
Target BS passes to serving BS with described switching dedicated resource information, and should switch dedicated resource information by serving BS and pass to portable terminal;
Perhaps,
Target BS directly passes to portable terminal with described switching dedicated resource information.
11, a kind of base station is characterized in that, comprising:
The target BS selected cell, being used for according to quality of service information and/or wireless resource information is that to be switched portable terminal is selected a target BS;
The switching notice unit is used for carrying out switching according to the selection result notice portable terminal of described target BS selected cell.
12, base station according to claim 11 is characterized in that, also comprises:
Switch the private resource allocation units, be used for the time, switch private resource for this portable terminal distributes as target BS;
Switch the private resource notification unit, the switching dedicated resource information that is used for switching private resource correspondence that described switching private resource allocation units are distributed sends described portable terminal to.
13, base station according to claim 11 is characterized in that, described target BS selected cell specifically comprises:
The parameter information acquiring unit is used for obtaining one or multiple parameters information of the QoS class information of the wireless resource information of the current service quality QoS requirements of portable terminal, adjacent base station and the current support of adjacent base station;
The selection operation unit, being used for according to the parameter information that described parameter information acquiring unit obtains is that portable terminal is selected a target BS.
14, according to claim 11,12 or 13 described base stations, it is characterized in that, also comprise:
The base station selected unit of alternative target is used to be switched portable terminal to select the alternative target base station;
The switching notice processing unit is used for after knowing that portable terminal can't switch to described target BS, with described alternative target base station communication, portable terminal is switched to this alternative target base station.
15, claim 11,12 or 13 described base stations is characterized in that, also comprise:
The timing offset computing unit is used to calculate base station after the switching and the timing offset between the portable terminal;
The timing offset notification unit is used for that described timing offset computing unit is calculated the timing offset of determining and notifies described portable terminal.
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| CNA2007101187354A CN101345987A (en) | 2007-07-12 | 2007-07-12 | Method and base station for implementing fast switch-over in communication network |
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| CN102131255A (en) * | 2010-01-15 | 2011-07-20 | 华为技术有限公司 | Switching method and network node (NN) in relay network |
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