CN102413525A - Rapid downlink switching method in linear overlay network, base station controller (BSC) and base station subsystem - Google Patents
Rapid downlink switching method in linear overlay network, base station controller (BSC) and base station subsystem Download PDFInfo
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Abstract
The invention relates to a rapid downlink switching method in a linear overlay network, a base station controller (BSC) and a base station subsystem. The method comprises the following steps that: the BSC carries out adjacent area configuration to each cell; lately continuous N measuring report information reported by a base transceiver station (BST) is received and stored; according to the measuring report information or the measuring report information combined with switching direction information of a mobile station (MS) stored by BSC, a cell switching service of the current MS is performed. During switching and deciding, a rapid downlink switching algorithm decision formula is used. Average processing is not needed to be performed to the measuring report data. Simultaneously, a wireless quality condition of the served cell is not needed to be considered and the wireless quality of the adjacent cell is only needed to be considered. Under the condition of not influencing a conversation, switching can be initiated as soon as possible. Time for the switching and the decision can be reduced so that a dropped call rate can be effectively reduced and a demand of rapid switching for a high-speed rail can be satisfied.
Description
Technical field
The present invention relates to field of mobile communication, relate in particular to descending fast switch over method, BSC and base station sub-system in a kind of linear covering network that is applied on the high-speed railway private network.
Background technology
In GSM (Global System for Mobile Communications, global system for mobile communications) mobile communication, the travelling carriage (MS that the user hands; Mobile Station) be that mobile terminal locations is unfixed, the base station of network side is then fixed, simultaneously; Because the interference of surrounding environment, along with moving of user, communication quality possibly tend to worsen; Especially in the environment of fast moving such as high-speed railway, because the speed of train is very fast, even per hour above 350 kilometers; Make user terminal in the train pass through Serving cell fast and when getting into another sub-district, be very easy to occur the call drop problem.Wherein solve this call drop problem effective measures be to switch first.Switching flow can guarantee normally carrying out of communication, can also be used to improve the quality of communication.
In the GSM network; Whether switch the judgement by BSC (base station controller, base station controller), BSC receives BTS (Base Transceiver Station; Base transceiver station) measurement report that reports determines whether switching according to the data of measurement report.Existing BSC system supports multiple handoff algorithms, and its switching flow is: BSC receives measurement report, carries out switch decision according to the value of measurement report.The BSC system determines corresponding handoff algorithms automatically according to current wireless environment, if certain handoff algorithms is set up, BSC selects the Target cell of switching, switches trial.
Existing handoff algorithms; One side need be done average treatment to measurement report; On the other hand, need to consider the wireless quality situation of Serving cell and Target cell, when having only wireless quality when wireless quality of Serving cell very poor (being lower than the threshold value of backstage setting) and Target cell better than Serving cell; Switch decision is just set up, and switches trial.Under quick scenes such as high-speed railway, the MS translational speed is very fast, and Serving cell and overlapping region, adjacent area are limited, must in the limited time, switch fast and accurately.And original handover algorithm application can not satisfy the demand that high ferro is switched fast in high iron rule, for scenes such as high ferro, all is belt-like zone because the minizone distributes; MS is in high-speed motion; Must switch,, just initiate to switch when the wireless quality of Serving cell is very poor if adopt original handoff algorithms; Then can cause call drop, influence the user communication quality because of MS can't in time switch to new sub-district.
Summary of the invention
Main purpose of the present invention is to provide descending fast switch over method, BSC and base station sub-system in a kind of linear covering network that is applied on the high-speed railway private network, is intended to improve the switch speed of MS, reduces the probability of call drop.
The present invention proposes descending fast switch over method in a kind of linear covering network, comprising:
Base station controller BSC is carried out neighbor cell configuration to each sub-district, and each adjacent area all disposes directional information;
Reception is also preserved the nearest N continuous measurement report information that base transceiver station BTS reports, and said measurement report information comprises: the movement velocity of mobile station MS and the direction of motion and adjacent area level value under the BSC;
Combine the switching direction information of the MS of BSC preservation to carry out the sub-district service switchover of current MS according to said measurement report information or according to said measurement report information.
Preferably, BSC step that neighbor cell configuration is carried out in each sub-district comprises:
BSC respectively disposes an adjacent area with direction signs in the relative both sides of each sub-district, make the adjacent area of each sub-district be linear distribution, and the directional information of the adjacent area of the same side is configured to identical;
For neighbor cell configuration is used for the level threshold value of switch decision and the dynamic deflection threshold value under the friction speed rank, be stored in the background data base.
Preferably, saidly comprise according to measurement report information or the step that combines the switching direction information of the MS that BSC preserves to carry out the sub-district service switchover of current MS according to said measurement report information:
Obtain the current threshold value and the dynamic deflection threshold value of the descending level in corresponding adjacent area of configuration from background data base according to the movement velocity of current MS in the current measurement report information;
When said BSC does not have the switching direction information of said current MS, from current measurement report information, obtain the direction of motion of said current MS;
The direction of motion of current MS is away from current service cell; And when the adjacent area level value corresponding with the direction of motion of said current MS is all greater than said current threshold value in the said nearest N continuous measurement report information; The sub-district switching flow as switching target small area, is initiated to said current MS in said adjacent area; Perhaps
Preserve the switching direction information of said current MS as said BSC; And the nearest N continuous corresponding with this a switching direction adjacent area level value is during all greater than said current threshold value; The sub-district switching flow as switching target small area, is initiated to said current MS in said adjacent area;
Preserving said adjacent area direction is the switching direction of said current MS.
Preferably, saidly also comprise according to measurement report information or the step that combines the switching direction information of the MS that BSC preserves to carry out the sub-district service switchover of current MS according to said measurement report information:
The direction of motion of current MS is for getting into current service cell; Perhaps the direction of motion of current MS is one of at least less than said current threshold value away from current service cell and a nearest N continuous adjacent area level value corresponding with this direction of motion; The switching direction information of perhaps preserving said current MS as said BSC; And the nearest N continuous corresponding with this a switching direction adjacent area level value is not initiated the sub-district switching flow to said current MS during one of at least less than said current threshold value.
The present invention also proposes descending quick switching BSC in a kind of linear covering network, comprising:
The network management configuration module is used for neighbor cell configuration is carried out in each sub-district of BSC, and each adjacent area all disposes directional information;
The measurement report processing module is used to receive and preserve the nearest N continuous measurement report information that BTS reports, and said measurement report information comprises: the movement velocity of MS and the direction of motion and adjacent area level value under the BSC;
The switch decision processing module is used for combining the switching direction information of the MS of BSC preservation to carry out the sub-district service switchover of current MS according to said measurement report information or according to said measurement report information.
Preferably, said network management configuration module also is used for respectively disposing an adjacent area with direction signs in the relative both sides of each sub-district, make the adjacent area of each sub-district be linear distribution, and the directional information of the adjacent area of the same side is configured to identical; And, be stored in the background data base for neighbor cell configuration is used for the level threshold value of switch decision and the dynamic deflection threshold value under the friction speed rank.
Preferably, said switch decision processing module comprises:
The threshold value acquiring unit is used for obtaining from background data base according to the movement velocity of the current MS of current measurement report information the current threshold value and the dynamic deflection threshold value of the descending level in corresponding adjacent area of configuration;
Direction of motion acquiring unit is used for when said BSC does not have the switching direction information of said current MS, from current measurement report information, obtaining the direction of motion of said current MS;
The judgement switch unit; Be used for not having the switching direction information of said current MS as said BSC; The direction of motion of current MS is away from current service cell; And when the adjacent area level value corresponding with the direction of motion of said current MS is all greater than said current threshold value in the said nearest N continuous measurement report information, the sub-district switching flow as switching target small area, is initiated to said current MS in said adjacent area; Perhaps
Preserve the switching direction information of said current MS as said BSC; And the nearest N continuous corresponding with this a switching direction adjacent area level value is during all greater than said current threshold value; The sub-district switching flow as switching target small area, is initiated to said current MS in said adjacent area;
Preserve the unit, being used to preserve said adjacent area direction is the switching direction of said current MS.
Preferably, said judgement switch unit also is used for:
The direction of motion of current MS is for getting into current service cell; Perhaps the direction of motion of current MS is one of at least less than said current threshold value away from current service cell and a nearest N continuous adjacent area level value corresponding with this direction of motion; The switching direction information of perhaps preserving said current MS as said BSC; And the nearest N continuous corresponding with this a switching direction adjacent area level value is not initiated the sub-district switching flow to said current MS during one of at least less than said current threshold value.
The present invention also proposes descending quick base station shifting subsystem in a kind of linear covering network, comprising: BSC, with several BTS of said BSC wireless connections and the MS that communicates by letter with said BTS, wherein:
Said MS is used for the adjacent area level value information of this MS is reported said BSC through said BTS;
Said BTS; Be used to detect the movement velocity and the direction of motion of MS; Receive the adjacent area level value information that MS reports, regularly to said BSC reporting measurement reports information, said measurement report information comprises: the movement velocity of MS and the direction of motion and adjacent area level value under the BSC;
Said BSC is used for neighbor cell configuration is carried out in each sub-district; Receive and preserve the nearest N continuous measurement report information that BTS reports, combine the switching direction information of the MS of BSC preservation to carry out the sub-district service switchover of current MS according to said measurement report information or according to said measurement report information.
Preferably, said BSC is aforesaid BSC.
Descending fast switch over method, BSC and base station sub-system are carried out neighbor cell configuration through BSC to each sub-district in a kind of linear covering network that the present invention proposes, movement velocity and the direction of motion and the adjacent area level value of MS in the measurement report information that reports according to BTS; And the switching direction information that combines the MS that BSC preserves carries out the sub-district service switchover of current MS, when switch decision, adopts descending quick handoff algorithms judgement formula, do not need measurement report data is averaged processing; Simultaneously need not consider the wireless quality situation of Serving cell yet, and only need consider the wireless quality of adjacent area, and linear environmental quality such as comprehensive high ferro; The direction of motion that is MS can not change in a period of time; Switching to the adjacent area of the direction of motion will inevitably take place in MS in motion process, therefore except switching first; Only whether the level value of the adjacent area on the needs consideration MS directions of motion (switching direction) is adjudicated and can be let MS insert; Guarantee under the situation that does not influence conversation, can initiate as early as possible to switch, reduce the required time of switch decision; Effectively reduce the call drop probability, satisfy the demand that high ferro is switched fast.
Description of drawings
Fig. 1 is descending fast switch over method one an embodiment schematic flow sheet in the linear covering network of the present invention;
Fig. 2 is the level value sketch map of MS intersection in the sub-district in the descending fast switch over method one embodiment high ferro private network in the linear covering network of the present invention;
Fig. 3 is a neighbor cell configuration sketch map among descending fast switch over method one embodiment in the linear covering network of the present invention;
Fig. 4 combines the switching direction information of the MS of BSC preservation to carry out the schematic flow sheet of the sub-district service switchover of current MS according to measurement report information or according to measurement report information among descending fast switch over method one embodiment in the linear covering network of the present invention;
Fig. 5 is descending quick switching BSC one an example structure sketch map in the linear covering network of the present invention;
Fig. 6 is the structural representation of switch decision processing module among descending quick switching BSC one embodiment in the linear covering network of the present invention;
Fig. 7 is that descending quick base station shifting subsystem is unified the example structure sketch map in the linear covering network of the present invention.
In order to make technical scheme of the present invention clearer, clear, will combine accompanying drawing to do further to detail below.
Embodiment
Embodiment of the invention solution mainly is through BSC neighbor cell configuration to be carried out in each sub-district; The switching direction information that the movement velocity of MS and the direction of motion and adjacent area level value and BSC preserve in the measurement report information that reports according to BTS is carried out the sub-district service switchover of current MS; Reduce the required time of switch decision, effectively reduce the call drop probability.
Being applied to linear private network environment such as high ferro below with the present invention is that example describes technical scheme of the present invention, but is not limited thereto kind of a situation.
As shown in Figure 1, one embodiment of the invention proposes descending fast switch over method in a kind of linear covering network, comprising:
Step S101, BSC carries out neighbor cell configuration to each sub-district;
Present embodiment method running environment relates to the base station sub-system of being made up of BSC and some BTS, and in this base station sub-system, when carrying out the business information transmission between MS and the BTS, BTS measures the quality of up link, and BSC is given in regular reporting.MS measures the quality of down link; Be that the level value of adjacent area described in the present embodiment is measured to the received signal level on the BCCH of other BTS around it simultaneously; MS delivers to BSC through slow associated control channel (SACCH, Slow AssociatedControl Channel) through BTS with measurement result.BSC is according to the calculating to measurement result, and whether decision switches.After BSC thinks that the current channel that is using of certain MS need switch, handoff request is proposed then.
The present embodiment method specifically is applied in the linear private network environment such as high ferro, and under the high ferro scene, the high ferro region covered is long and narrow belt-like zone; The intersection of Serving cell and adjacent area among the BSC, along with MS to the moving of adjacent area, the level value of Serving cell constantly descends; The level value of adjacent area then constantly rises; Because in the existing handoff algorithms, switching be the wireless quality at Serving cell become very poor the time just carry out switch decision, promptly the level value of Serving cell is lower than certain threshold value and just carries out switch decision; If existing big online handover algorithm application on the high ferro private network, is then produced following problem:
As shown in Figure 2, if the Serving cell level value is to just carrying out switch decision below the A point, and this moment the adjacent area level value fine, if carry out switch decision this moment, possibly cause switching untimely.If the Serving cell level just switches below having arrived the B point, and the level of adjacent area is also very little at this moment, if carry out switch decision this moment, possibly cause MS to switch the back call drop.Therefore, when existing handoff algorithms is used for the high ferro private network, need to consider when carry out switch decision, promptly the threshold value of carrying out switch decision need be set in the backstage, and change of network environment is various, parameter is provided with comparatively difficulty.
In the present embodiment; In order to improve the switching promptness rate, reduce the call drop probability, the present embodiment method is with a CS (CircuitSwitch; Circuit switching; Referring to that call voice is professional) switching flow in the business is divided into switching first with non-the switching first and handles, and the introducing switching direction carries out switch decision according to the descending level value of the adjacent area on the switching direction.
As shown in Figure 3, present embodiment at first need be for each BTS cell covered among the BSC disposes corresponding adjacent area, and each adjacent area all disposes directional information; Specifically respectively dispose a adjacent area, make the adjacent area of each sub-district be linear distribution, and the directional information of the adjacent area of the same side is configured to identical with direction signs in the relative both sides of each sub-district; Also to be stored in the background data base for neighbor cell configuration is used for the level threshold value of switch decision and the dynamic deflection threshold value under the friction speed rank.
Consider the linear characteristics that cover of high ferro private network, for making high ferro website neighbor cell configuration simple, switching direction is clear and definite; Only configuring adjacent cell relation between the high ferro coverage cell only allows MS mutual with big net AT STATION, so the interior user's of train switching can only be inner at private network; Thereby guaranteed the switching effect of MS, in the high ferro cell configuration, be each high ferro cell configuration adjacent area direction; Respectively dispose an adjacent area in the relative both sides of each sub-district, make the adjacent area of each sub-district be linear distribution.Specifically as shown in Figure 3, the adjacent area direction be divided into A to or B to, promptly each sub-district only dispose A to B to two adjacent areas, and each direction of sub-district only disposes an adjacent area.High ferro sub-district concrete configuration situation is as shown in Figure 3, and the B of sub-district (CELL) 2 is sub-district (CELL) 1 to the adjacent area, and A is sub-district (CELL) 3 to the sub-district; The A of sub-district (CELL) 1 is sub-district (CELL) 2 to the adjacent area; The B of sub-district (CELL) 3 is sub-district (CELL) 2 to the adjacent area.
Step S102 receives and preserves the nearest N continuous measurement report information that BTS reports;
As stated, when carrying out the business information transmission between MS and the BTS, BTS measures the quality of up link, and regular (being generally every at a distance from 480ms) reports to BSC.MS measures the quality of down link; Be that the level value of adjacent area described in the present embodiment is measured to the received signal level on the BCCH of other BTS around it simultaneously, MS is that the measurement report information described in the present embodiment is delivered to BSC through slow associated control channel (SACCH) through BTS with measurement result.
In the present embodiment, BSC receives and preserves the nearest N continuous measurement report information that BTS reports, so that adopt predetermined descending quick handoff algorithms formula to carry out switch decision according to this measurement report information.
Wherein, measurement report information comprises: the movement velocity of MS and the direction of motion and adjacent area level value under the BSC; The direction of motion of MS is for current service cell, can judge that according to the direction of motion of MS MS gets into current service cell or away from current service cell, with reference to Fig. 3, if the direction of motion of MS be A to, then for getting into Serving cell (CELL) 2; If the direction of motion of MS be B to, then for leaving Serving cell (CELL) 2.The level threshold that the movement velocity of the MS that BTS reports is used for BSC Dynamic Selection switch decision is the level threshold value.
Need to prove; The direction value of the direction of motion of MS or direction coefficient are detected by BTS and report BSC in the measurement report information, and the direction value of the direction of motion of the MS that BTS reports is 1 or 0, when the direction value is 1; MS gets into Serving cell, need not switch; When the direction value was 0, MS need switch away from Serving cell, and during the switch decision success, preserving corresponding adjacent area is switching target small area, and switches trial, and the direction with the adjacent area behind the handover success saves as switching direction.
Step S103 combines the switching direction information of the MS of BSC preservation to carry out the sub-district service switchover of current MS according to measurement report information or according to measurement report information.
In the present embodiment, after BSC receives the measurement report information that BTS reports, whether preserve in switching direction information or this measurement report information of current MS the MS direction of motion according to BSC and judge whether that needs initiate the switching to the adjacent area.Because the banded Cover Characteristics of high ferro private network; Adopt descending quick handoff algorithms to carry out switch decision in the present embodiment, and introduce the notion of switching direction, in switching first at descending quick handoff algorithms; BSC obtains the direction of motion of MS from the measurement report information that BTS reports; Whether carry out switch decision according to direction of motion decision, BSC saves as switching direction with the direction of the Target cell that switches after switching first; In the non-switching first, BSC directly carries out switch decision to the adjacent area on the switching direction according to the switching direction information of preserving.When MS when switching first, BSC does not preserve the switching direction information of this MS, needs judge that according to the direction of motion of MS MS gets into current service cell or determines whether that away from current service cell needs carry out switch decision, its determination methods as previously mentioned.If MS gets into current service cell; Then need not carry out switch decision; If MS is away from current service cell, then carry out switch decision according to adjacent area level value in the nearest N continuous measurement report information of BSC reception and the predetermined descending quick handoff algorithms formula of combination; When court verdict when need switching, selects the adjacent area corresponding to switch with the direction of motion of MS, after switching completion first, this adjacent area direction as the switching direction information preservation of MS, is used when supplying next time switch decision.For example, with reference to Fig. 3, when MS on sub-district (CELL) 1; After for the first time switching to sub-district (CELL) 2, the record switching direction be A to, when switching next time; Only consider to A to the adjacent area switch, and needn't consider B, thereby improve the accuracy of switch decision to the adjacent area.
When MS is not when switching first, obtain switching direction the switching direction information that BSC preserved from last time, and according to the level value of the N continuous of the corresponding adjacent area of this switching direction and combine predetermined descending quick handoff algorithms formula to carry out switch decision.
Present embodiment carries out the predetermined descending quick handoff algorithms judgement formula that switch decision adopted:
RxLev_DL(n)＞DLRapidHoThs+DLRapidHoOffset_i
In above-mentioned formula; RxLev_DL (n) (level value) is the down-run survey report level value of certain adjacent area n of not process average treatment; DLRapidHoThs is the adjacent area level threshold of descending quick switching, and DLRapidHoOffset is the dynamic deflection thresholding, can be according to the speed of service of the MS that reports from BTS; 3 biasing grades are set: during high speed rank (more than the 250km/h), DLRapidHoOffset_i is the DLRapidHoOffsetH that the backstage is provided with; (150～250km/h) time, DLRapidHoOffset_i is the DLRapidHoOffsetM that the backstage is provided with to the middling speed rank; (0～150km/h) time, DLRapidHoOffset_i is the DLRapidHoOffsetL that the backstage is provided with to the low speed rank.N continuous is individual all to satisfy condition such as 20 RxLev_DL (n) value if the adjacent area has, and promptly an adjacent area N continuous RxLev_DL (n) is all greater than the level threshold value of selecting according to the movement velocity of current MS, and then descending quick switch decision is set up.
Present embodiment has been considered the influence of the movement velocity of MS in above-mentioned predetermined descending quick handoff algorithms judgement formula, select the descending level in adjacent area threshold value relatively according to the movement velocity of MS; For the fast MS of movement velocity, threshold value is selected smaller value, makes to switch carrying out more early; For the slower MS of movement velocity; Threshold value is selected higher value, makes switching carry out a little later, this kind processing mode; Have flexibility more, prevent when movement velocity is fast to switch untimely or movement velocity switches to adjacent area (this moment, the level of adjacent area was also very weak) very soon when slow and causes call drop.
When the switch decision establishment, before the initiation switching flow, BSC need select switching target small area, and the sub-district switching flow as the Target cell that switches, afterwards, will be initiated for MS in the adjacent area of satisfying the switch decision condition.
As shown in Figure 4, step S103 comprises:
Step S 1030, obtain the current threshold value and the dynamic deflection threshold value of the descending level in corresponding adjacent area of configuration from background data base according to the movement velocity of current MS in the current measurement report information;
Step S1031 judges the switching direction information of whether preserving current MS among the BSC; If have, then get into step S1037; Otherwise, get into step S1032;
Step S1032 obtains the direction of motion of current MS from current measurement report information;
Step S1033 judges whether the direction of motion of current MS is away from current service cell, if then get into step S1034; Otherwise, get into step S1038;
Step S1034 judges that whether adjacent area level value corresponding with the direction of motion of current MS in the nearest N continuous measurement report information is all greater than current threshold value; If, then get into step S1035, otherwise, step S1038 got into;
Step S1035 as switching target small area, initiates sub-district switching flow to current MS with the adjacent area;
Step S1036, preserving the adjacent area direction is the switching direction of current MS;
Step S 1037, judge that whether the corresponding nearest N continuous adjacent area level value of this switching direction is all greater than current threshold value, if then get into step S1035; Otherwise, get into step S1038;
Step S1038 does not initiate the sub-district switching flow to current MS.
Present embodiment carries out neighbor cell configuration through BSC to each sub-district, movement velocity and the direction of motion and the adjacent area level value of MS in the measurement report information that reports according to BTS, and combine the switching direction information of the MS that BSC preserves to carry out the sub-district service switchover of current MS; When switch decision, adopt descending quick handoff algorithms, do not need measurement report data is averaged processing, also need not consider the wireless quality situation of Serving cell simultaneously; Promptly need not consider the level situation of Serving cell, and only need consider the wireless quality of adjacent area, and linear environmental quality such as comprehensive high ferro; The direction of motion that is MS can not change in a period of time; Switching to the adjacent area of the direction of motion will inevitably take place in MS in motion process, therefore switch first except non-; Only whether the level value of the adjacent area on the needs consideration MS directions of motion (switching direction) is adjudicated and can be let MS insert; Promptly whether satisfy the switch decision formula,, then can initiate the flow process of switching toward the adjacent area if satisfy.Simultaneously; The movement velocity of the MS that carries in the measurement report information that present embodiment reports according to BTS is selected the switch level threshold value of adjacent area automatically; Increased the flexibility of switching, prevented when movement velocity is fast, to switch untimely or movement velocity switches to adjacent area (this moment, the level of adjacent area was also very weak) very soon when slow and causes call drop.Therefore, present embodiment is being guaranteed not influence under the situation of conversation, can initiate as early as possible to switch, and reduces the required time of switch decision, effectively reduces the call drop probability, satisfies the demand that high ferro is switched fast.
As shown in Figure 5, one embodiment of the invention proposes descending quick switching BSC in a kind of linear covering network, comprising: network management configuration module 501, measurement report processing module 502 and switch decision processing module 503, wherein:
Network management configuration module 501 is used for neighbor cell configuration is carried out in each sub-district of BSC, and each adjacent area all disposes directional information;
The present embodiment method specifically can be applied in the linear private network environment such as high ferro, and under the high ferro scene, the high ferro region covered is long and narrow belt-like zone; The intersection of Serving cell and adjacent area among the BSC, along with MS to the moving of adjacent area, the level value of Serving cell constantly descends; The level value of adjacent area then constantly rises; Because in the existing handoff algorithms, switching be the wireless quality at Serving cell become very poor the time just carry out switch decision, promptly the level value of Serving cell is lower than certain threshold value and just carries out switch decision; If existing big online handover algorithm application on the high ferro private network, is then produced following problem:
As shown in Figure 2, if the Serving cell level value is to just carrying out switch decision below the A point, and this moment the adjacent area level value fine, if carry out switch decision this moment, possibly cause switching untimely.If the Serving cell level just switches below having arrived the B point, and the level of adjacent area is also very little at this moment, if carry out switch decision this moment, possibly cause MS to switch the back call drop.Therefore, when existing handoff algorithms is used for the high ferro private network, need to consider when carry out switch decision, promptly the threshold value of carrying out switch decision need be set in the backstage, and change of network environment is various, parameter is provided with comparatively difficulty.
In the present embodiment; In order to improve the switching promptness rate, reduce the call drop probability, the present embodiment method is divided into the switching flow in CS business to switch first with non-switching first to be handled; Introduce switching direction, carry out switch decision according to the descending level value of the adjacent area on the switching direction.
As shown in Figure 3; Present embodiment at first need dispose corresponding adjacent area for each BTS cell covered among the BSC through network management configuration module 501; Specifically respectively dispose a adjacent area with direction signs in the relative both sides of each sub-district; Make the adjacent area of each sub-district be linear distribution, and the directional information of the adjacent area of the same side is configured to identical; And, be stored in the background data base for neighbor cell configuration is used for the level threshold value of switch decision and the dynamic deflection threshold value under the friction speed rank.
Consider the linear characteristics that cover of high ferro private network, for making high ferro website neighbor cell configuration simple, switching direction is clear and definite; Only configuring adjacent cell relation between the high ferro coverage cell only allows MS mutual with big net AT STATION, so the interior user's of train switching can only be inner at private network; Thereby guaranteed the switching effect of MS, in the high ferro cell configuration, be each high ferro cell configuration adjacent area direction; Respectively dispose an adjacent area in the relative both sides of each sub-district, make the adjacent area of each sub-district be linear distribution.Specifically as shown in Figure 3, the adjacent area direction be divided into A to or B to, promptly each sub-district only dispose A to B to two adjacent areas, and each direction of sub-district only disposes an adjacent area.High ferro sub-district concrete configuration situation is as shown in Figure 3, and the B of sub-district (CELL) 2 is sub-district (CELL) 1 to the adjacent area, and A is sub-district (CELL) 3 to the sub-district; The A of sub-district (CELL) 1 is sub-district (CELL) 2 to the adjacent area; The B of sub-district (CELL) 3 is sub-district (CELL) 2 to the adjacent area.
Measurement report processing module 502 is used to receive and preserve the nearest N continuous measurement report information that BTS reports, and this measurement report information comprises: the movement velocity of MS and the direction of motion and adjacent area level value under the BSC;
As stated, when carrying out the business information transmission between MS and the BTS, BTS measures the quality of up link, and regular (being generally every at a distance from 480ms) reports to BSC.MS measures the quality of down link; Be that the level value of adjacent area described in the present embodiment is measured to the received signal level on the BCCH of other BTS around it simultaneously, MS is that the measurement report information described in the present embodiment is delivered to BSC through slow associated control channel (SACCH) through BTS with measurement result.
In the present embodiment, BSC receives and preserves the nearest N continuous measurement report information that BTS reports through measurement report processing module 502, so that adopt predetermined descending quick handoff algorithms formula to carry out switch decision according to this measurement report information.
Wherein, measurement report information comprises: the movement velocity of MS and the direction of motion and adjacent area level value under the BSC; The direction of motion of MS is for current service cell, can judge that according to the direction of motion of MS MS gets into current service cell or away from current service cell, with reference to Fig. 3, if the direction of motion of MS be A to, then for getting into Serving cell (CELL) 2; If the direction of motion of MS be B to, then for leaving Serving cell (CELL) 2.The level threshold that the movement velocity of the MS that BTS reports is used for BSC Dynamic Selection switch decision is the level threshold value.
Need to prove; The direction value of the direction of motion of MS or direction coefficient are detected by BTS and report BSC in the measurement report information, and the direction value of the direction of motion of the MS that BTS reports is 1 or 0, when the direction value is 1; MS gets into Serving cell, need not switch; When the direction value was 0, MS need switch away from Serving cell, and during the switch decision success, preserving corresponding adjacent area is switching target small area, and switches trial, and the direction with the adjacent area behind the handover success saves as switching direction.
Switch decision processing module 503 is used for combining the switching direction information of the MS of BSC preservation to carry out the sub-district service switchover of current MS according to measurement report information or according to said measurement report information.
In the present embodiment, after BSC receives the measurement report information that BTS reports, judge whether that according to this measurement report information needs initiate the switching to the adjacent area by switch decision processing module 503.Because the banded Cover Characteristics of high ferro private network; Adopt descending quick handoff algorithms to carry out switch decision in the present embodiment, and introduce the notion of switching direction, in switching first at descending quick handoff algorithms; BSC obtains the direction of motion of MS from the measurement report information that BTS reports; Whether carry out switch decision according to direction of motion decision, BSC saves as switching direction with the direction of the Target cell that switches after switching first; In the non-switching first, BSC directly carries out switch decision to the adjacent area on the switching direction according to the switching direction information of preserving.
When MS when switching first, need to judge that according to the direction of motion of MS MS gets into current service cell or away from current service cell, its determination methods is as previously mentioned.If MS gets into current service cell; Then need not carry out switch decision; If MS is away from current service cell, then carry out switch decision according to adjacent area level value in the nearest N continuous measurement report information of BSC reception and the predetermined descending quick handoff algorithms formula of combination; When court verdict when need switching, selects the adjacent area corresponding to switch with the direction of motion of MS, after switching completion first, this adjacent area direction as the switching direction information preservation of MS, is used when supplying next time switch decision.For example, with reference to Fig. 3, when MS on sub-district (CELL) 1; After for the first time switching to sub-district (CELL) 2, the record switching direction be A to, when switching next time; Only consider to A to the adjacent area switch, and needn't consider B, thereby improve the accuracy of switch decision to the adjacent area.
When MS is not when switching first, obtain switching direction the switching direction information that BSC preserved from last time, and according to the level value of the N continuous of the corresponding adjacent area of this switching direction and combine predetermined descending quick handoff algorithms formula to carry out switch decision.
Present embodiment carries out the predetermined descending quick handoff algorithms judgement formula that switch decision adopted:
RxLev_DL(n)＞DLRapidHoThs+DLRapidHoOffset_i
In above-mentioned formula; RxLev_DL (n) (level value) is the down-run survey report level value of certain adjacent area n of not process average treatment; DLRapidHoThs is the adjacent area level threshold of descending quick switching, and DLRapidHoOffset is the dynamically biasing of adjustment, can be according to the speed of service of the MS that reports from BTS; 3 biasing grades are set: during high speed rank (more than the 250km/h), DLRapidHoOffset_i is the DLRapidHoOffsetH that the backstage is provided with; (150～250km/h) time, DLRapidHoOffset_i is the DLRapidHoOffsetM that the backstage is provided with to the middling speed rank; (0～150km/h) time, DLRapidHoOffset_i is the DLRapidHoOffsetL that the backstage is provided with to the low speed rank.N continuous is individual all to satisfy condition such as 20 RxLev_DL (n) value if the adjacent area has, and promptly an adjacent area N continuous RxLev_DL (n) is all greater than the level threshold value of selecting according to the movement velocity of current MS, and then descending quick switch decision is set up.
Present embodiment has been considered the influence of the movement velocity of MS in above-mentioned predetermined descending quick handoff algorithms judgement formula, select the descending level in adjacent area threshold value relatively according to the movement velocity of MS; For the fast MS of movement velocity, threshold value is selected smaller value, makes to switch carrying out more early; For the slower MS of movement velocity; Threshold value is selected higher value, makes switching carry out a little later, this kind processing mode; Have flexibility more, prevent when movement velocity is fast to switch untimely or movement velocity switches to adjacent area (this moment, the level of adjacent area was also very weak) very soon when slow and causes call drop.
When the switch decision establishment, before the initiation switching flow, BSC need select switching target small area, and the sub-district switching flow as the Target cell that switches, afterwards, will be initiated for MS in the adjacent area of satisfying the switch decision condition.
As shown in Figure 6, switch decision processing module 503 comprises: threshold value acquiring unit 5030, direction of motion acquiring unit 5031, judgement switch unit 5032 and preservation unit 5033, wherein:
Threshold value acquiring unit 5030 is used for obtaining from background data base according to the movement velocity of the current MS of current measurement report information the current threshold value and the dynamic deflection threshold value of the descending level in corresponding adjacent area of configuration;
Direction of motion acquiring unit 5031 is used for when BSC does not have the switching direction information of current MS, from current measurement report information, obtaining the direction of motion of current MS;
Further, judgement switch unit 5032 also is used for:
The direction of motion of current MS is for getting into current service cell; Perhaps the direction of motion of current MS is one of at least less than said current threshold value away from current service cell and a nearest N continuous adjacent area level value corresponding with this direction of motion; The switching direction information of perhaps preserving current MS as BSC; And the nearest N continuous corresponding with this a switching direction adjacent area level value is not initiated the sub-district switching flow to current MS during one of at least less than current threshold value.
As shown in Figure 7, one embodiment of the invention proposes descending quick base station shifting subsystem in a kind of linear covering network, comprising: BSC701, with several BTS702 of BSC701 wireless connections and the MS703 that communicates by letter with BTS702, wherein:
MS703 is used for this MS adjacent area level value information is reported BSC through BTS;
BTS702 is used to detect the direction of motion and the movement velocity of MS, receives the adjacent area level value information that MS reports, and regularly to BSC701 reporting measurement reports information, this measurement report information comprises: the movement velocity of MS and the direction of motion and adjacent area level value under the BSC;
BSC701 is used for neighbor cell configuration is carried out in each sub-district; Receive and preserve the nearest N continuous measurement report information that BTS702 reports, combine the switching direction information of the MS of BSC preservation to carry out the sub-district service switchover of current MS according to measurement report information or according to measurement report information.
In the present embodiment, BSC701 can be the BSC described in the foregoing description.
The embodiment of the invention is carried out neighbor cell configuration through BSC to each sub-district, movement velocity and the direction of motion and the adjacent area level value of MS in the measurement report information that reports according to BTS, and combine the switching direction information of the MS that BSC preserves to carry out the sub-district service switchover of current MS; When switch decision, adopt descending quick handoff algorithms, do not need measurement report data is averaged processing, also need not consider the wireless quality situation of Serving cell simultaneously; Promptly need not consider the level situation of Serving cell, and only need consider the wireless quality of adjacent area, and linear environmental quality such as comprehensive high ferro; The direction of motion that is MS can not change in a period of time; Switching to the adjacent area of the direction of motion will inevitably take place in MS in motion process, therefore except switching first; Only whether the level value of the adjacent area on the needs consideration MS directions of motion (switching direction) is adjudicated and can be let MS insert; Promptly whether satisfy the switch decision formula,, then can initiate the flow process of switching toward the adjacent area if satisfy.Simultaneously; The movement velocity of the MS that carries in the measurement report information that present embodiment reports according to BTS is selected the switch level threshold value of adjacent area automatically; Increased the flexibility of switching, prevented when movement velocity is fast, to switch untimely or movement velocity switches to adjacent area (this moment, the level of adjacent area was also very weak) very soon when slow and causes call drop.Therefore, present embodiment is being guaranteed not influence under the situation of conversation, can initiate as early as possible to switch, and reduces the required time of switch decision, effectively reduces the call drop probability, satisfies the demand that high ferro is switched fast.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical field, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. descending fast switch over method in the linear covering network is characterized in that, comprising:
Base station controller BSC is carried out neighbor cell configuration to each sub-district, and each adjacent area all disposes directional information;
Reception is also preserved the nearest N continuous measurement report information that base transceiver station BTS reports, and said measurement report information comprises: the movement velocity of mobile station MS and the direction of motion and adjacent area level value under the BSC;
Combine the switching direction information of the MS of BSC preservation to carry out the sub-district service switchover of current MS according to said measurement report information or according to said measurement report information.
2. method according to claim 1 is characterized in that, the step that BSC carries out neighbor cell configuration to each sub-district comprises:
BSC respectively disposes an adjacent area with direction signs in the relative both sides of each sub-district, make the adjacent area of each sub-district be linear distribution, and the directional information of the adjacent area of the same side is configured to identical;
For neighbor cell configuration is used for the level threshold value of switch decision and the dynamic deflection threshold value under the friction speed rank, be stored in the background data base.
3. method according to claim 2 is characterized in that, saidly comprises according to measurement report information or the step that combines the switching direction information of the MS that BSC preserves to carry out the sub-district service switchover of current MS according to said measurement report information:
Obtain the current threshold value and the dynamic deflection threshold value of the descending level in corresponding adjacent area of configuration from background data base according to the movement velocity of current MS in the current measurement report information;
When said BSC does not have the switching direction information of said current MS, from current measurement report information, obtain the direction of motion of said current MS;
The direction of motion of current MS is away from current service cell; And when the adjacent area level value corresponding with the direction of motion of said current MS is all greater than said current threshold value in the said nearest N continuous measurement report information; The sub-district switching flow as switching target small area, is initiated to said current MS in said adjacent area; Perhaps
Preserve the switching direction information of said current MS as said BSC; And the nearest N continuous corresponding with this a switching direction adjacent area level value is during all greater than said current threshold value; The sub-district switching flow as switching target small area, is initiated to said current MS in said adjacent area;
Preserving said adjacent area direction is the switching direction of said current MS.
4. method according to claim 3 is characterized in that, saidly also comprises according to measurement report information or the step that combines the switching direction information of the MS that BSC preserves to carry out the sub-district service switchover of current MS according to said measurement report information:
The direction of motion of current MS is for getting into current service cell; Perhaps the direction of motion of current MS is one of at least less than said current threshold value away from current service cell and a nearest N continuous adjacent area level value corresponding with this direction of motion; The switching direction information of perhaps preserving said current MS as said BSC; And the nearest N continuous corresponding with this a switching direction adjacent area level value is not initiated the sub-district switching flow to said current MS during one of at least less than said current threshold value.
5. descending quick switching BSC in the linear covering network is characterized in that, comprising:
The network management configuration module is used for neighbor cell configuration is carried out in each sub-district of BSC, and each adjacent area all disposes directional information;
The measurement report processing module is used to receive and preserve the nearest N continuous measurement report information that BTS reports, and said measurement report information comprises: the movement velocity of MS and the direction of motion and adjacent area level value under the BSC;
The switch decision processing module is used for combining the switching direction information of the MS of BSC preservation to carry out the sub-district service switchover of current MS according to said measurement report information or according to said measurement report information.
6. BSC according to claim 5; It is characterized in that; Said network management configuration module also is used for respectively disposing an adjacent area with direction signs in the relative both sides of each sub-district, make the adjacent area of each sub-district be linear distribution, and the directional information of the adjacent area of the same side is configured to identical; And, be stored in the background data base for neighbor cell configuration is used for the level threshold value of switch decision and the dynamic deflection threshold value under the friction speed rank.
7. BSC according to claim 6 is characterized in that, said switch decision processing module comprises:
The threshold value acquiring unit is used for obtaining from background data base according to the movement velocity of the current MS of current measurement report information the current threshold value and the dynamic deflection threshold value of the descending level in corresponding adjacent area of configuration;
Direction of motion acquiring unit is used for when said BSC does not have the switching direction information of said current MS, from current measurement report information, obtaining the direction of motion of said current MS;
The judgement switch unit; Be used for not having the switching direction information of said current MS as said BSC; The direction of motion of current MS is away from current service cell; And when the adjacent area level value corresponding with the direction of motion of said current MS is all greater than said current threshold value in the said nearest N continuous measurement report information, the sub-district switching flow as switching target small area, is initiated to said current MS in said adjacent area; Perhaps
Preserve the switching direction information of said current MS as said BSC; And the nearest N continuous corresponding with this a switching direction adjacent area level value is during all greater than said current threshold value; The sub-district switching flow as switching target small area, is initiated to said current MS in said adjacent area;
Preserve the unit, being used to preserve said adjacent area direction is the switching direction of said current MS.
8. BSC according to claim 7 is characterized in that, said judgement switch unit also is used for:
The direction of motion of current MS is for getting into current service cell; Perhaps the direction of motion of current MS is one of at least less than said current threshold value away from current service cell and a nearest N continuous adjacent area level value corresponding with this direction of motion; The switching direction information of perhaps preserving said current MS as said BSC; And the nearest N continuous corresponding with this a switching direction adjacent area level value is not initiated the sub-district switching flow to said current MS during one of at least less than said current threshold value.
9. descending quick base station shifting subsystem in the linear covering network is characterized in that, comprising: BSC, with several BTS of said BSC wireless connections and the MS that communicates by letter with said BTS, wherein:
Said MS is used for the adjacent area level value information of this MS is reported said BSC through said BTS;
Said BTS; Be used to detect the movement velocity and the direction of motion of MS; Receive the adjacent area level value information that MS reports, regularly to said BSC reporting measurement reports information, said measurement report information comprises: the movement velocity of MS and the direction of motion and adjacent area level value under the BSC;
Said BSC is used for neighbor cell configuration is carried out in each sub-district; Receive and preserve the nearest N continuous measurement report information that BTS reports, combine the switching direction information of the MS of BSC preservation to carry out the sub-district service switchover of current MS according to said measurement report information or according to said measurement report information.
10. base station sub-system according to claim 9 is characterized in that, said BSC is each described BSC among the claim 5-8.
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