CN1859726A - Method for realizing user's terminal switching in layered cells - Google Patents
Method for realizing user's terminal switching in layered cells Download PDFInfo
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- CN1859726A CN1859726A CN 200510084198 CN200510084198A CN1859726A CN 1859726 A CN1859726 A CN 1859726A CN 200510084198 CN200510084198 CN 200510084198 CN 200510084198 A CN200510084198 A CN 200510084198A CN 1859726 A CN1859726 A CN 1859726A
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Abstract
The present invention discloses user terminal switching in layering cell implementation method. It contains obtaining user terminal traveling speed and according to acquired traveling speed to determine user terminal suited layering cell being miniature cell or macro cell; if user terminal current located layering cell with suited layering cell being same layer then not switching; otherwise further obtaining target cell load and according to acquired load judging target cell whether accepting user terminal, if accepting then controlling user terminal switching to target cell, otherwise not switching. Said invention can obviously improve layering cell load balance status and raise user terminal communication quality.
Description
Technical field
The present invention relates to the wireless access network technology in the communication network, be specifically related to the implementation method that a kind of user terminal switches in floored community.
Background technology
Along with the continuous increase of number of users and service traffics, the communication network of using especially more communication hot spot region occurred in Wideband Code Division Multiple Access (WCDMA) (CDMA) network at present.Therefore number of users and service traffics usually big a lot of than in other communication zone of these communications in hot spot regions need the communication resource that distributes also corresponding more than other communication zone.Just need in communication network, increase more sub-district in this case to improve overall system capacity.
Therefore, in communication network, adopt the cell configuration mode of layered cell structure (HCS Hierarchical CellStructure) that the microzonation in the communication network is divided into two different sub-district levels of macrocell and Microcell at present.Wherein, macrocell is as the bigger floored community of signal effective coverage range, and Microcell is as the less floored community of signal effective coverage range.Usually can use the Zone Full that a plurality of macrocells effectively cover whole communication network, Microcell then effectively covers the communication hot spot region in the communication network.Described signal effective coverage range is meant: user terminal in this signal cover (UE) can obtain higher communication quality.Though UE still can receive the wireless signal of this floored community outside the signal effective coverage range of certain floored community, the wireless signal strength that receives differs and guarantees that surely UE can obtain higher communication quality.
Usually divide the floored community carrying level of UE according to speed, that is: carry translational speed UE faster by the bigger macrocell of signal effective coverage range, to reduce the switching frequency of UE; By the less slower UE of Microcell carrying translational speed of signal effective coverage range, so that the business with higher transmission rates to be provided to UE.In order to accomplish this point, radio network controller (RNC) needs to obtain in real time or periodically the translational speed of UE in the floored community of its management, and UE translational speed of obtaining and the speed threshold value that self sets in advance compared, to determine that this UE currently is in high-speed moving state, the low speed mobile status still is the normal speed mobile status.Have, because RNC manages this UE communication, so RNC can know that the present residing floored community of this UE is macrocell or Microcell again.
Through behind the aforesaid operations, be arranged in Microcell and be in high-speed moving state if RNC determines UE, RNC then initiates to switch, and this UE is switched in the macrocell by present residing Microcell; If RNC determines UE and is arranged in macrocell and is in the low speed mobile status that RNC then initiates to switch, and this UE is switched in the Microcell by present residing macrocell; If RNC determines the current normal speed mobile status that is in of UE, RNC does not then carry out handover operation to this UE.
As seen, through behind the aforesaid operations, the UE that is in high-speed moving state has just switched in the macrocell, makes the switching frequency of this UE obviously reduce; The UE that is in the low speed mobile status has then switched in the Microcell, makes network side to provide the business with higher transmission rates to this UE.When the RNC decision switched to UE in the Target cell, this Target cell had heavier load probably but in actual applications.Yet RNC still can control this UE to this Target cell switching in this case, and this causes the UE handoff failure probably, makes the communication quality of UE be affected, even causes the UE call drop.
And, in the process that Target cell switches, this Target cell can switch to support this UE for this UE allocate communications resource at RNC control UE, and this will make the load of Target cell heavier, even reduce the communication quality of the UE in this Target cell, also be unprofitable to the realization of each floored community load balance.
Summary of the invention
In view of this, the implementation method that provides a kind of user terminal to switch in floored community is provided main purpose of the present invention, to improve the load balanced condition of floored community.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses the implementation method that a kind of user terminal switches in floored community, this method comprises:
Obtain the user terminal translational speed and determine that according to the translational speed of obtaining the floored community that user terminal is fit to is Microcell or macrocell; If the current place of user terminal floored community and the floored community that is fit to layer together then do not switch; Otherwise, further obtain the load of Target cell and according to the load judgment Target cell that obtains receivability user terminal whether, if receivability is then controlled user terminal and switched to Target cell; Otherwise, do not switch.
The method of obtaining described user terminal translational speed is:
The same level sub-district switching times that takes place in unit interval according to user terminal obtains the translational speed of user terminal.
The method of obtaining described user terminal translational speed is:
The change frequency of the best sub-district of signal quality obtains the translational speed of user terminal in the unit interval that arrives according to user terminal measurement.
The method of determining the floored community that user terminal is fit to is:
Compare with described user terminal translational speed and the high-speed door limit value, the slow door limit value that set in advance,, determine that user terminal only is fit to Microcell if the user terminal translational speed is lower than the slow door limit value; If the user terminal translational speed surpasses the high-speed door limit value, determine that user terminal only is fit to macrocell; If the user terminal translational speed between slow door limit value and high-speed door limit value, determines then that user terminal both had been fit to macrocell and also has been fit to Microcell.
The method of determining the floored community that user terminal is fit to is:
Obtain the average speed of full community user terminal and normal speed value zone is set, if described user terminal translational speed in this normal speed value zone, determines that this user terminal both had been fit to macrocell and also has been fit to Microcell according to this average speed; If described user terminal translational speed surpasses the velocity amplitude of the normal speed value zone upper limit, determine that this user terminal only is fit to macrocell; If described user terminal translational speed is lower than the velocity amplitude of normal speed value zone lower limit, determine that this user terminal only is fit to Microcell.
The current place of described user terminal floored community is determined with following method:
Obtain the cell layer time mark of sub-district, the current place of user terminal, and judge that on behalf of Microcell, this cell layer time mark still represent macrocell,, determine that user terminal is currently located in the Microcell if represent Microcell; If the representative macrocell determines that user terminal is currently located in the macrocell.
The described method of obtaining the Target cell load is:
Obtain the carrier transmit gross power of target cell base station, with the carrier transmit gross power obtained as the Target cell load; Or
Obtain the received signal overall strength of target cell base station, with the received signal overall strength obtained as the Target cell load.
Judge described Target cell whether the method for receivability user terminal be:
Compare with described Target cell load of obtaining and the load-threshold value that sets in advance, can't admit described user terminal if Target cell, is then determined in all Target cell loads all above load-threshold value; If exist load not surpass the Target cell of load-threshold value, then definite this Target cell can be admitted described user terminal.
Judge described Target cell whether the method for receivability user terminal be:
According to the cell-of-origin load at the current place of user terminal and the difference of Target cell load load-threshold value is set, if all Target cell loads deduct the difference of cell-of-origin load gained all above the load-threshold value that is provided with, then definite Target cell can't be admitted described user terminal; If there is Target cell, the difference that its load deducts cell-of-origin load gained does not surpass the load-threshold value that is provided with, and then definite this Target cell can be admitted described user terminal.
The method that the control user terminal switches comprises:
The messaging parameter that user terminal and its place cell base station are communicated sends to described Target cell, sets up communication channel by this Target cell according to the messaging parameter of receiving;
The messaging parameter that communication channel comprised that Target cell is set up sends to user terminal, and user terminal inserts the described communication channel that Target cell is set up according to the messaging parameter of receiving.
Compared with prior art, the implementation method that user terminal provided by the present invention switches in floored community, when UE switches because of its speed triggers, the load that also will further obtain Target cell, determine whether to control UE with this and switch, and switch to which or which Target cell.Make the load balanced condition of floored community obtain obvious improvement, and then can improve the communication quality of UE, and improve user satisfaction.
Description of drawings
Fig. 1 is the flow chart that the realization user terminal of a preferred embodiment of the present invention switches in floored community.
Embodiment
Below in conjunction with drawings and the specific embodiments to the detailed description of the invention.
The implementation method that user terminal provided by the invention switches in floored community comprises:
Obtain the user terminal translational speed and determine that according to the translational speed of obtaining the floored community that user terminal is fit to is Microcell or macrocell; If the current place of user terminal floored community and the floored community that is fit to layer together then do not switch; Otherwise, further obtain the load of Target cell and according to the load judgment Target cell that obtains receivability user terminal whether, if receivability is then controlled user terminal and switched to Target cell; Otherwise, do not switch.
Referring to Fig. 1, Fig. 1 is the flow chart that the realization UE of a preferred embodiment of the present invention switches in floored community, and this flow process may further comprise the steps:
Step 101:RNC obtains the translational speed of UE in the floored community of its management in real time or periodically.The method that present adaptable RNC obtains the UE translational speed has multiple, as: the change frequency of the best sub-district of signal quality etc. obtains the translational speed of UE in the unit interval that same level sub-district switching times that takes place in the unit interval according to UE or UE measure, as: directly the change frequency of same level sub-district switching times that UE was taken place in the unit interval or the UE best sub-district of signal quality in unit interval of measuring is as the UE current movement speed.
Wherein, RNC obtains the method for the change frequency of the best sub-district of signal quality in unit interval that UE measures and is: RNC can know that according to the cell signal quality measured message that UE reports the signal quality of which sub-district that UE measures is best.If the best sub-district of the signal quality that UE measures in a period of time has taken place repeatedly to change, as: the signal quality of original cell A is best, the signal quality that is sub-district B afterwards is best, and be that the signal quality of sub-district A is best, RNC then can determine cell change that signal quality is best twice.Like this, the time that RNC once went through divided by described variation with the change frequency of the best sub-district of signal quality, just can obtain the change frequency of the sub-district of best signal quality in the unit interval.
Step 102:RNC compares with the UE translational speed obtained and the speed threshold value that self sets in advance, with definite this UE currently be in high-speed moving state, the low speed mobile status still is the normal speed mobile status.
The described speed threshold value that is provided with generally includes: slow door limit value and high-speed door limit value, RNC compares with the UE translational speed of obtaining and slow door limit value, the high-speed door limit value of setting, when RNC when knowing that relatively described UE translational speed is lower than the slow door limit value of setting, RNC determines that this UE is current and is in the low speed mobile status, and enters step 103; When RNC when knowing that relatively described UE translational speed has surpassed the high-speed door limit value that is provided with, RNC determines the current high-speed moving state that is in of this UE, and enter step 104; When RNC when relatively knowing between slow door limit value that described UE translational speed is being provided with and the high-speed door limit value, RNC determines that this UE is current and is in the normal speed mobile status, and process ends.
Step 103:RNC obtains the cell layer time mark of sub-district, UE place, and judges whether this cell layer time mark represents Microcell, if RNC determines that UE is currently located in the Microcell, and direct process ends; Otherwise RNC determines the current Microcell that is not arranged in of UE, enters step 105.As: the inferior numerical value that is labeled as in 0 or 1 of cell layer, if the cell layer of obtaining time mark is 1, RNC determines that UE is currently located in the Microcell; If the cell layer of obtaining time mark is 0, RNC determines that UE is current and is not arranged in Microcell, but is arranged in macrocell.
Step 104:RNC obtains the cell layer time mark of sub-district, UE place, judges the current macrocell that whether is arranged in of UE according to the cell layer of obtaining time mark, if, then direct process ends; Otherwise, enter step 108.
Step 105:RNC obtains as Microcell and is used to carry out the load of the Target cell of UE switching, above-mentioned Target cell can be called the target Microcell usually; Comparatively speaking, sub-district, the present place of UE can be called the cell-of-origin.Described target Microcell may be one, also may be a plurality of.
Obtain in the neighbor cell configuration information that the Target cell that UE switches can dispose from cell-of-origin, the present place of UE.The neighbor cell configuration information of each sub-district sets in advance when networking usually.
The method of obtaining the load of target Microcell is generally: RNC sends carrier transmit gross power or received signal omnidirectional measurement order to the target microcell base station, after the target microcell base station is received this measuring command, will send to RNC by carrier transmit gross power or the received signal overall strength that measures.RNC with the carrier transmit gross power received or received signal overall strength as the current load of target Microcell.
Step 106:RNC judges whether not to be in the target Microcell of high load condition according to the target Microcell load that obtains, if having, enters step 107; Otherwise, direct process ends.Concrete determination methods is generally: RNC is with receiving and comparing as the described carrier transmit gross power of target Microcell load or received signal overall strength and the load-threshold value that self sets in advance, if the carrier transmit gross power of all target Microcells or received signal overall strength are all above load-threshold value, RNC then determines not to be in the target Microcell of high load condition; If exist carrier transmit gross power or received signal overall strength not to surpass the target Microcell of load-threshold value, RNC determines that then this target Microcell is not in high load condition.
Step 107:RNC control UE switches to the target Microcell that is not in high load condition.Concrete changing method is generally: RNC sends to the target Microcell with the messaging parameters such as channel configuration that UE and source cell base station communicate, and sets up communication channel by the target Microcell according to the messaging parameter of receiving.Afterwards, the messaging parameter that communication channel comprised that RNC sets up the target Microcell sends to UE, and UE inserts the described communication channel that the target Microcell is set up according to the messaging parameter of receiving.Afterwards, RNC Controlling Source sub-district discharges the channel resource that once distributed for UE.
The described target Microcell that UE switches to can be a minimum target Microcell of load, also can be all lower a plurality of target Microcells of load.UE is identical with above-mentioned corresponding changing method to the method that a plurality of target Microcells switch in RNC control.
After finishing switching, process ends.
Step 108:RNC obtains as macrocell and is used to carry out the load of the Target cell of UE switching, above-mentioned Target cell can be called the target macro sub-district usually.Described target macro sub-district may be one, also may be a plurality of.
The method of obtaining the load of target Microcell in the method for obtaining the target macro cell load and the step 105 is identical, and the object that just obtains load has become the target macro sub-district.
Step 109:RNC judges whether not to be in the target macro sub-district of high load condition according to the target macro cell load that obtains, if having, enters step 110; Otherwise, direct process ends.Concrete determination methods is identical with determination methods in the step 106, and just the object of judging has become the target macro sub-district.
As seen, step 106 is all to judge with the purpose of step 109 whether described Target cell can admit described UE, can think usually: if described Target cell all is in high load condition, then can't admit described UE; Otherwise the Target cell that is not in high load condition just can be admitted described UE.
Step 110:RNC control UE switches to the target macro sub-district that is not in high load condition.Concrete changing method is identical with changing method in the step 107, and the Target cell that just is used to switch has become the target macro sub-district.
In actual applications, decision logic in the step 102 and speed threshold value also can otherwise be provided with, as: the full sub-district UE average speed that obtains cell-of-origin, UE place, according to this average speed normal speed value zone is set, as: will and be lower than the velocity amplitude zone that the UE translational speed in the UE average speed certain limit is comprised above the UE translational speed in the UE average speed certain limit, jointly as normal speed value zone.
The velocity amplitude that is comprised with the normal speed value zone of described UE translational speed and setting compares, if described UE translational speed in this normal speed value zone, determines that this UE translational speed is Chang Su, this UE both had been fit to macrocell and also has been fit to Microcell; If described UE translational speed surpasses the velocity amplitude of the normal speed value zone upper limit, determine that this UE translational speed is high speed, this UE only is fit to macrocell; If described UE translational speed is lower than the velocity amplitude of normal speed value zone lower limit, determine that this UE translational speed is a low speed, this UE only is fit to Microcell.
As seen, the basic goal of step 102 is: judge whether only suitable macrocell of UE according to the UE translational speed of obtaining, still only suitable Microcell still both had been fit to macrocell and also had been fit to Microcell.Usually can think when UE is in high-speed moving state only suitable macrocell; When UE is in the low speed mobile status, only suitable Microcell; When UE is in the normal speed mobile status, both had been fit to macrocell and also had been fit to Microcell.
Have, decision logic described in the step 106 and load-threshold value also can otherwise be provided with again, as: according to as described in the cell-of-origin load and as described in the difference of Target cell load, a load-threshold value is set.If all target Microcell loads deduct the difference of cell-of-origin load gained all above the load-threshold value that is provided with, then determine not to be in the target Microcell of high load condition; If there is the target Microcell, the difference that its load deducts cell-of-origin load gained does not surpass the load-threshold value that is provided with, and determines that then this target Microcell is not in high load condition.
Certainly, above-mentioned decision logic and load-threshold value set-up mode are based on the situation of Target cell load greater than the cell-of-origin load, if the Target cell load is less than the cell-of-origin load, then to deduct the difference of Target cell load gained and the load-threshold value of setting compares with the cell-of-origin load.
By flow process shown in Figure 1 as can be known, when UE switched because of its speed triggers, the load that also will further obtain Target cell determined whether to control UE with this and switches, and switched to which or which Target cell.This has guaranteed that UE can accomplish the load balance of floored community as far as possible when switching.
By the above as can be seen, the implementation method that UE provided by the present invention switches in floored community can obviously be improved the load balanced condition of floored community, and then can improve the communication quality of UE, and improves user satisfaction.
Claims (10)
1, the implementation method switched in floored community of a kind of user terminal is characterized in that this method comprises:
Obtain the user terminal translational speed and determine that according to the translational speed of obtaining the floored community that user terminal is fit to is Microcell or macrocell; If the current place of user terminal floored community and the floored community that is fit to layer together then do not switch; Otherwise, further obtain the load of Target cell and according to the load judgment Target cell that obtains receivability user terminal whether, if receivability is then controlled user terminal and switched to Target cell; Otherwise, do not switch.
2, the method for claim 1 is characterized in that, the method for obtaining described user terminal translational speed is:
The same level sub-district switching times that takes place in unit interval according to user terminal obtains the translational speed of user terminal.
3, the method for claim 1 is characterized in that, the method for obtaining described user terminal translational speed is:
The change frequency of the best sub-district of signal quality obtains the translational speed of user terminal in the unit interval that arrives according to user terminal measurement.
4, the method for claim 1 is characterized in that, determines that the method for the floored community that user terminal is fit to is:
Compare with described user terminal translational speed and the high-speed door limit value, the slow door limit value that set in advance,, determine that user terminal only is fit to Microcell if the user terminal translational speed is lower than the slow door limit value; If the user terminal translational speed surpasses the high-speed door limit value, determine that user terminal only is fit to macrocell; If the user terminal translational speed between slow door limit value and high-speed door limit value, determines then that user terminal both had been fit to macrocell and also has been fit to Microcell.
5, the method for claim 1 is characterized in that, determines that the method for the floored community that user terminal is fit to is:
Obtain the average speed of full community user terminal and normal speed value zone is set, if described user terminal translational speed in this normal speed value zone, determines that this user terminal both had been fit to macrocell and also has been fit to Microcell according to this average speed; If described user terminal translational speed surpasses the velocity amplitude of the normal speed value zone upper limit, determine that this user terminal only is fit to macrocell; If described user terminal translational speed is lower than the velocity amplitude of normal speed value zone lower limit, determine that this user terminal only is fit to Microcell.
6, the method for claim 1 is characterized in that, the current place of described user terminal floored community is determined with following method:
Obtain the cell layer time mark of sub-district, the current place of user terminal, and judge that on behalf of Microcell, this cell layer time mark still represent macrocell,, determine that user terminal is currently located in the Microcell if represent Microcell; If the representative macrocell determines that user terminal is currently located in the macrocell.
7, the method for claim 1 is characterized in that, the described method of obtaining the Target cell load is:
Obtain the carrier transmit gross power of target cell base station, with the carrier transmit gross power obtained as the Target cell load; Or
Obtain the received signal overall strength of target cell base station, with the received signal overall strength obtained as the Target cell load.
8, the method for claim 1 is characterized in that, judge described Target cell whether the method for receivability user terminal be:
Compare with described Target cell load of obtaining and the load-threshold value that sets in advance, can't admit described user terminal if Target cell, is then determined in all Target cell loads all above load-threshold value; If exist load not surpass the Target cell of load-threshold value, then definite this Target cell can be admitted described user terminal.
9, the method for claim 1 is characterized in that, judge described Target cell whether the method for receivability user terminal be:
According to the cell-of-origin load at the current place of user terminal and the difference of Target cell load load-threshold value is set, if all Target cell loads deduct the difference of cell-of-origin load gained all above the load-threshold value that is provided with, then definite Target cell can't be admitted described user terminal; If there is Target cell, the difference that its load deducts cell-of-origin load gained does not surpass the load-threshold value that is provided with, and then definite this Target cell can be admitted described user terminal.
10, the method for claim 1 is characterized in that, the method that the control user terminal switches comprises:
The messaging parameter that user terminal and its place cell base station are communicated sends to described Target cell, sets up communication channel by this Target cell according to the messaging parameter of receiving;
The messaging parameter that communication channel comprised that Target cell is set up sends to user terminal, and user terminal inserts the described communication channel that Target cell is set up according to the messaging parameter of receiving.
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