CN101365242A - Method and system based on mobile prediction and group switching - Google Patents
Method and system based on mobile prediction and group switching Download PDFInfo
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- CN101365242A CN101365242A CNA2008100422313A CN200810042231A CN101365242A CN 101365242 A CN101365242 A CN 101365242A CN A2008100422313 A CNA2008100422313 A CN A2008100422313A CN 200810042231 A CN200810042231 A CN 200810042231A CN 101365242 A CN101365242 A CN 101365242A
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Abstract
The invention discloses a group switch method based on a mobility prediction. Multi-service group user ends which move along fixed routes in a major public transportation system need to apply to a target base station for group switch according to detected changes of a wireless channel. The method further provides a mobility prediction based on location information, which comprises the following steps: the process of reselecting a target cell is simplified by using a mobile historical database; and the target cell is enabled to obtain relative information of all group users in advance through a backup backbone network. Required channel resources are reallocated through strategies such as borrowing channels, etc. Therefore, the system switch speed of the group user terminal is greatly improved, and QoS of broadband wireless communications in the switch process is guaranteed. The method further discloses a group switch system based on the mobility prediction, which mainly comprises a location information unit, a switch judging unit, a channel borrowing and resource allocating unit and a channel allocating unit.
Description
Technical field
The present invention relates to the broadband wireless communications field, relate in particular to colony's changing method and system based on moving projection, the colony that can be widely used in the mobile subscriber of multi-service group in the large-scale public transport switches.
Background technology
Growing along with the technology of broadband wireless communications, following wide-band mobile communication system expectation provide higher message transmission rate, wider signal cover and support high-speed mobile.Traditional changing method adopts each user terminal constantly to scan the quality of the wireless channel of Current Serving BTS usually, will carry out reselecting of base station in the time can not keeping the communication conditions needed, switches to adjacent signal strength signal intensity base station preferably then.In the urban environment of user's intensity, especially in large-scale public transport moving process, the user terminal problem that switching at present exists in the process of switching affiliated in it is:
Excessive signaling consumption during switching, communication quality descended even causes call drop when handoff delay, switching caused switching according to packet loss;
Current switchover policy is not accomplished to select target BS fast thereby carry out moving projection according to the position mobile message when cinr (carrier-in-interference noise ratio) descends rapidly, thereby consuming time very big in the cell selecting process;
The switching that the multi-user service that moves for colony connects, be connected when disconnecting with former serving BS, reenter the service quality of every kind of business of maintenance that can not be complete in the target BS process in switching, these problems all may cause high speed mobile terminal to switch satisfaction to descend.
In whole handoff procedure, because different business has different requirements, so selection can improve the performance of the switching of BWA based on colony's changing method of moving projection.In a word, no matter be present 3G, still in B3G from now on even the 4G wireless communication system, because to the more and more higher requirement of telecommunication service quality and the complexity of system design, certainly will be also more and more higher to the requirement of handoff technique, the design philosophy that provides QoS (service quality) to guarantee need be overthrown and then be adopted to traditional handover mechanism.
Summary of the invention
The object of the present invention is to provide a kind of colony's changing method and system,, improve the telecommunication service quality in the handoff procedure to reduce the delay time and the cutting off rate of user terminal when switching based on moving projection.
For reaching above purpose, solution of the present invention is:
A kind of colony's changing method based on moving projection, its key step is as follows:
In large-scale public transportation system, mobile-relay station is installed, the horde body and function family that it is served receive to the handoff request of target BS or own initiatively send handoff request after, relay station scans adjacent sites, serving BS obtains the positional information of Reference Group's user terminal according to mobile relayed information prediction, select targeted sites, serving BS is mutual by backup network and target BS then, targeted sites is the parameter that the multi-service user of this colony disposes wireless channel, and described user terminal carries out colony according to the pre-configured parameter of channel to targeted sites and switches.
Further, also comprise channel from using strategy, target BS is that user's dynamic assignment resource is switched in colony, when inadequate resource, carries out resource distribution by dynamically use bandwidth from the connection of the low priority service type set up.
Also comprise colony's switch decision, the remaining bandwidth of target BS carries out colony's user terminal and switches greater than switching required bandwidth; Otherwise calculate the bandwidth that non-real-time service can be used,, carry out the user of colony and switch if greater than the required bandwidth of using; Otherwise calculate the bandwidth that real time business can be used, switch if the sum that can use bandwidth, carries out the user of colony greater than the required bandwidth of using; Otherwise colony switches the lower connection request of medium priority and will be rejected.
Serving BS comprises by the mutual content of backup network and target BS: serving BS provides the channel parameter of mobile subscriber terminal at physical layer and link layer to target BS; Target BS notification service base station subchannels distribution condition.
The method that this serving BS obtains the positional information of mobile subscriber terminal in advance is: be in colony's user terminal in the large-scale public transport under communications status, the adjacent base station by continuous scanning communication system comes user terminal is carried out obtaining of positional information and moving direction.
Set up a mobile historical data base (Movement History Database, MHD), store the mobile historical record of mobile-relay station on the large-scale bus tool, determine the positional information and the moving direction of user terminal, determine next target BS according to Current Serving BTS, obtain the user's of colony handover-target base station.
Particularly, generally speaking, the mobile alignment of large-scale public transport is determined, the current mobile-relay station that is installed in the large-scale public transit system can be the horde body and function family terminal forwarding information of being served, after the signal strength signal intensity that receives was set out scanning, mobile-relay station began the wireless signal strength of scanning neighbor base stations; Mobile-relay station point is made next target BS according to the positional information and the moving direction of this public transport according to mobile historical data base prediction, and select best candidate's website as the target BS that switches according to the metrical information of colony's user terminal, and serving BS is by the relevant user information of backup network notification target base station about this colony's switching; Target BS receives after the user's of colony of this time switching the relevant information, according to the information of obtaining in advance the resource requirement that switches is carried out dynamic assignment, if channel resource inadequately then need the blocking rate that reduces to switch by the self-channel scheme of using, and by backup network notification service base station subchannels distribution condition.
Total system of the present invention mainly comprises positional information unit, switch decision unit, channel is used and resource allocation unit and channel configuration unit.The detection of positional information unit by signal strength signal intensity draws along the position of colony's user terminal of certain route high-speed mobile and according to change in location and makes the moving direction judgement, and contrasts the next target BS that mobile historical data base is found out this serving BS; The switch decision unit according to described signal strength detection report make switch decision and make choosing of target BS according to the result of positional information unit, and come the whole handoff procedure of guide management; Channel is used and resource allocation unit is the target BS chosen obtains colony's user terminal by backup network a relevant information, do not switch the user if there are enough channel resources to offer, then target BS need carry out channel and uses, and redistributes according to carrying out subchannel with the information interaction of serving BS; The channel configuration unit is according to the user terminal channel operating position of serving BS, by target BS the subchannel that distributes carried out again wireless channel parameter configuration.
Owing to adopted such scheme, the present invention has following characteristics: among the present invention, serving BS and target BS are by the backup network interactive information, adopt channel to provide channel resource allocation for switching colony simultaneously from using strategy, make whole handoff procedure save handoff delay time and the obstruction and the call drop that have reduced switching greatly, taken care of yourself communication quality and the quality of handoff in the handoff procedure.
Description of drawings
Fig. 1 is based on the user of the colony switched system structured flowchart of moving projection;
Fig. 2 is a moving projection block diagram as a result;
Fig. 3 is based on the user of the colony switching flow figure of moving projection;
Embodiment
The present invention is further illustrated below in conjunction with the accompanying drawing illustrated embodiment.
When being in the switching between different base station of colony's user terminal in the large-scale public transport among the present invention, change and moving projection according to positional information, simplify the target BS reuse adoption process, optimize the process that rebulids that connects, directly carry out channel configuration for the multi-service user terminal, to reach the process that the user of colony is switched fast according to current information.
Switching to target BS B with all terminal uses from Current Serving BTS A is example, and the colony's changing method among the embodiment is as follows, comprises the steps:
In the scanning mode process, the signal of the mobile-relay station point continuous measurement adjacent cell at colony user terminal place also obtains the positional information and the moving direction at user terminal place according to the position location algorithms of TOA (time of arrival time of arrival (toa)) and TDOA (time difference of arrival is poor the time of advent) in a given time, mobile-relay station in conjunction with mobile historical data base and by channel strength detect in candidate's neighbours base station, select best cell and with it as Target cell, serving BS A will inform target BS B with the colony's user situation in the current mobile-relay station by backup network.
The request prerequisite that switches to target BS B is, user terminal is before switching to target BS B, the mutual of correlated channels parameter carried out by the reserve backbone network in the base station of serving BS and Target cell, do not switch user's use if there are enough channels to offer, then Target cell carries out channel to a large number of users terminal under this system and uses preassignment again with channel, provide safeguard for networking again after the switching of a large number of users terminal in future, and channel is used and distribution condition notification service base station.
User terminal receives wireless channel preassignment situation and the relevant parameter information about target BS B that Current Serving BTS A sends, and changes the wireless channel parameter of physical layer according to the configuration information of service progress transmission.User terminal is finished by the channel parameter of configuration and is switched the back re-networking process.
Compared with prior art, mainly select Target cell fast by moving projection exactly in the above-mentioned flow process, information interaction by backup network then, Target cell switches the distribution and the configuration of needed channel, and with channel configuration advisory serving BS A, switch use for the user of colony if there are enough resources, then use strategy and from already present service chaining, obtain the part channel resource by channel, and then all users of colony that notify participation to switch, make whole handoff procedure save handoff delay time and the obstruction and the call drop that have reduced switching greatly, taken care of yourself communication quality and the quality of handoff in the handoff procedure.
The colony of this Tape movement prediction switches to system of broadband wireless communication and has brought the channel utilization height, and it is low to switch cutting off rate, and handoff algorithms is simple, lighter advantages such as signaling traffic load.Group's changing method based on moving projection mainly is exactly a kind of channel preassignment of networking and scheme of configuration switched, and concrete implementation step is as follows:
In the present invention, when this large-scale bus tool moves to certain cell edge area driver sweep request along fixing mobile alignment after, mobile-relay station point is by scanning neighbor sub-district picked up signal parameter, and it is reported to Current Serving BTS A, mobile-relay station is to add up by the channel parameter that a large amount of wireless user terminals send, accumulation and the calculating of process this section period in continuous position fixing process, constantly the data message of calculating portable terminal report and signal strength signal intensity etc. are carried out the measurement of positional information and the prediction of moving direction and are judged.Localization method is as follows:
The mobile-relay station point can be monitored a series of base station, and measures each poor to time of arrival (toa).For example, if three base stations are arranged then can draw two independently measured values of TDOA.The measured value of each TDOA can determine that a travelling carriage must thereon hyperbolic fix district, position, and the intersection point in two hyperbolic fix districts has then been determined the position of mobile-relay station point.The above has described a self aligning system, otherwise then is a long-range positioning system (Loran).If the transmission of each travelling carriage is monitored in each base station, and note time of arrival (toa) (TOA), again this TOA is sent to a control centre, can calculate required TDOA and draw hyperbola in this control centre, the location point of being fixed by these hyp intersection points and the simple triangulation calculation that adopts the TOA mode to carry out is handled again, can determine the mobile-relay station point with and interior a large amount of colony's user's accurate position, and by the statistics in a period of time we can obtain the moving direction of mobile-relay station point.
After moving direction that obtains colony's user terminal and positional information, we remove to search mobile historical data base (MHD, Movement History Database) historical record, the MHD structure is as shown in table 1, storing the mobile historical record of mobile-relay station point on the large-scale bus tool among the MHD, mainly comprising moving direction, serving BS_ID, average residence time, nexttarget BS_ID and total degree.Because the mobile alignment of large-scale bus tool is fixed, so used the default objects base station record the database if switch to target BS from Current Serving BTS, then this use total degree that moves historical record just adds 1.We can pass through Current Serving BTS combining position information and moving direction by the method, very fast obtain the target BS that the user of this colony will be switched in the future, serving BS can pass through needed channel resource of backup network prior notice target BS and channel configuration situation, the cutting off rate that reduces to switch.
Table 1 Movement History Database (MHD)
After target BS obtained details about this colony's user terminal that serving BS transmits, target BS came to switch user resource allocation for the colony of the multi-service terminal that will arrive according to the report of serving BS.Suppose that total bandwidth is C, remaining bandwidth is expressed as b
Sur, the bandwidth of reserving n% is as the protection channel, and the needed bandwidth of connection request is b
ReqFor the connection request that newly advances, if (b
Sur-b
Req) C*n%, then this request is allowed to; For switching connection request, if (b
Sur-b
Req) 0, then this request is allowed to.If remaining bandwidth is less than the needed bandwidth of connection request, target BS will dynamically be used bandwidth and carry out resource reservation for arriving in the future to switch from the connection of the low priority service type set up, if use the request that the back bandwidth still can not satisfy switching, then some low-level handoff request will be prevented from, and concrete grammar is as follows:
According to the moving projection result, when predicting colony's user terminal when having a large amount of real time business handoff request to arrive, serving BS is informed target BS by backup network, if the remaining bandwidth b of target BS
SurLess than its minimum essential requirement bandwidth b
R_rt, the then required bandwidth b that uses
BrwEqual (b
R_rt-b
Sur).Because BS (base station base station) does not give BE (best effort best effort) bandwidth reserved, therefore only with set up from non-real-time service and real time business be connected use bandwidth.Suppose that the linking number of already present non-real-time service and real time business is respectively N among this BS
NrtAnd N
Rt, b
R_nrtThe minimum reservation bandwidth of non-real-time service, b are kept in expression
Nrt-iFor current each non-real-time service connects the bandwidth of using, wherein 0≤i≤N
Nrtb
Rt-iFor current each real time business connects the bandwidth of using, wherein 0 〉=i≤N
Rt
Do not interrupt for the non-real-time service that keeps having set up connects, can connect the maximum bandwidth of using from each each non-real-time service of having set up and be (b
Nrt_i-b
R_nrt).Therefore the total bandwidth that can use from existing non-real-time service connects is calculated by formula (1).
By formula (1) as can be seen: many more if certain non-real-time service connects the bandwidth that takies, then its bandwidth of lending the real time business connection that is allowed to is many more.
If b
BrwB
Brw_nrt, then the switching connection request of the real time business service of Dao Daing only connects from non-real-time service that to use bandwidth be not enough, must use bandwidth to existing real time business connection simultaneously.Can use from existing each real time business connection
Bandwidth is (b
Rt_i-b
R_rt).
Therefore, the total amount of bandwidth of using from rtPS (service of Real-time Polling Service real time polling) connects can be calculated by through type (2).
If b
Brw_rt＜b
Brw-b
Brw_nrtEven then use bandwidth from the connection of the low priority service type set up, target BS keeps enough bandwidth can not for unsettled rtPS connection request, to be rejected so some in colony switches switched connection request, concrete operations will be carried out different disposal according to user's service priority level.
The user of the colony handoff algorithms based on moving projection that proposes mainly is used in the large-scale public transport in city, this class is positioned at the user terminal ordinary circumstance mobile alignment in fixing mobile place and fixes, can make correct tracking and prediction to motion track, in conjunction with the dynamic preallocated switching Access Control Policy of handoff request target base station resources, adopt simultaneously and use strategy according to the dynamic channel of moving projection and come to provide different priority levels to the connection of different COS, the moment that the user of multi-service colony in fixing public transit system is switched in a large number improves in system's fairness, guarantees the QoS of system.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (7)
1. radio communication colony changing method is characterized in that: comprising:
In large-scale public transportation system, mobile-relay station is installed, the horde body and function family that it is served receive to the handoff request of target BS or own initiatively send handoff request after, relay station scans adjacent sites, serving BS obtains the positional information of Reference Group's user terminal according to mobile relayed information prediction, select targeted sites, serving BS is mutual by backup network and target BS then, targeted sites is the parameter that the multi-service user of this colony disposes wireless channel, and described user terminal carries out colony according to the pre-configured parameter of channel to targeted sites and switches.
2. radio communication as claimed in claim 1 colony changing method, it is characterized in that: comprise that also channel is from using strategy, target BS is that user's dynamic assignment resource is switched in colony, when inadequate resource, carry out resource distribution by from the connection of the low priority service type set up, dynamically using bandwidth.
3. the method that radio communication as claimed in claim 1 colony switches is characterized in that: also comprise colony's switch decision, the remaining bandwidth of target BS carries out colony's user terminal and switches greater than switching required bandwidth; Otherwise calculate the bandwidth that non-real-time service can be used,, carry out the user of colony and switch if greater than the required bandwidth of using; Otherwise calculate the bandwidth that real time business can be used, switch if the sum that can use bandwidth, carries out the user of colony greater than the required bandwidth of using; Otherwise colony switches the lower connection request of medium priority and will be rejected.
4. the method that radio communication as claimed in claim 1 colony switches is characterized in that: serving BS comprises by the mutual content of backup network and target BS: serving BS provides the channel parameter of mobile subscriber terminal at physical layer and link layer to target BS; Target BS notification service base station subchannels distribution condition.
5. radio communication as claimed in claim 1 colony changing method, it is characterized in that: the method that this serving BS obtains the positional information of mobile subscriber terminal in advance is: be in colony's user terminal in the large-scale public transport under communications status, the adjacent base station by continuous scanning communication system comes user terminal is carried out obtaining of positional information and moving direction.
6. radio communication as claimed in claim 5 colony changing method, it is characterized in that: set up a mobile historical data base (Movement History Database, MHD), store the mobile historical record of mobile-relay station on the large-scale bus tool, determine the positional information and the moving direction of user terminal, determine next target BS according to Current Serving BTS, obtain the user's of colony handover-target base station.
7. radio communication colony switched system, it is characterized in that: it mainly comprises positional information unit, switch decision unit, channel is used and resource allocation unit and channel configuration unit, the detection of positional information unit by signal strength signal intensity draws along the position of colony's user terminal of certain route high-speed mobile and according to change in location and makes the moving direction judgement, and contrasts the next target BS that mobile historical data base is found out this serving BS; The switch decision unit according to described signal strength detection report make switch decision and make choosing of target BS according to the result of positional information unit, and come the whole handoff procedure of guide management; Channel is used and resource allocation unit is the target BS chosen obtains colony's user terminal by backup network a relevant information, do not switch the user if there are enough channel resources to offer, then target BS need carry out channel and uses, and redistributes according to carrying out subchannel with the information interaction of serving BS; The channel configuration unit is according to the user terminal channel operating position of serving BS, by target BS the subchannel that distributes carried out again wireless channel parameter configuration.
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