CN101340704A - Cell switch determining method - Google Patents
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- CN101340704A CN101340704A CNA2007101182079A CN200710118207A CN101340704A CN 101340704 A CN101340704 A CN 101340704A CN A2007101182079 A CNA2007101182079 A CN A2007101182079A CN 200710118207 A CN200710118207 A CN 200710118207A CN 101340704 A CN101340704 A CN 101340704A
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Abstract
The embodiment of the invention discloses a judgment method for switching between cells and the switching judge is carried out according to a switching condition and wireless signal parameters obtained. The method also includes: a safety threshold of an influence degree is set; UE current comprehensive location parameters are obtained. The UE current comprehensive location parameters comprise the influence degree on a service cell by the UE. When the influence degree on the service cell by the UE current location is judged to be higher than or equal to the safety threshold of the influence degree, the switching condition is adjusted to be easier to meet; when the influence degree on the service cell by the UE current location is judged to be lower than the safety threshold of the influence degree, the switching condition is adjusted to be harder to meet. The judge method can improve success rate of switching between cells.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of cell switch determining method.
Background technology
In wireless communication system, when the quality of wireless channel of user terminal (UE) Serving cell is relatively poor, UE need be switched to the better adjacent cell of quality of wireless channel usually, think that the user provides more good service.Sub-district switching in the existing wireless communications system may further comprise the steps:
The 1st step: UE measures the wireless signal of Serving cell and adjacent cell, and periodically or incident ground by base station in service sector to network controls entity reporting measurement reports.
The 2nd step: the network controls entity carries out switch decision.
Usually, network side can set in advance the switching condition corresponding to wireless signal parameters such as signal level intensity, signal quality levels.For example, the switching condition that sets in advance can be: the signal of adjacent cell and Serving cell is compared, judge whether to be better than to a certain degree.The switching condition that sets in advance also can be: the signal level intensity that the signal level intensity of Serving cell is lower than a certain threshold value and adjacent cell is higher than a certain threshold value, and the signal quality levels that the signal quality levels of Serving cell is lower than a certain threshold level and adjacent cell is higher than a certain threshold level etc.Certainly corresponding switching condition can also be set at the combination of two or more wireless signal parameters.
The process of described switch decision is: the Serving cell that the network controls entity reports in measurement report according to UE and the current wireless signal parameter of adjacent cell, judge whether the described switching condition that sets in advance satisfies, when switching condition satisfies, judge UE is switched to the adjacent cell that certain meets switching condition from Serving cell.
The 3rd step: if the court verdict in above-mentioned the 2nd step is for switching, then the network controls entity sends switching command to UE, and carries out corresponding Radio Link control.
The 4th step: UE switches to the adjacent cell that described quality of wireless channel meets the handoff parameter requirement according to switching command.
The process of being switched by above-mentioned sub-district is as can be known: before switching, need carry out switch decision.Existing switch decision all carries out based on the wireless signal parameter in the measurement report because the wireless signal parameter can reflect the quality of wireless channel that the sub-district is current exactly, therefore, with the wireless signal parameter as the basis of switch decision be essential, also be suitable.
But, in actual motion, when the quality of wireless channel difference of Serving cell to a certain degree, make the condition of switch decision satisfy and when issuing switching command, because the continuous mobility of UE and the complexity of wireless network environment, the quality of wireless channel of Serving cell may be poor to making UE correctly receive switching command, at this moment, will cause handoff failure.For example, when rapid fading (fast fade) took place, the quality of wireless channel of Serving cell was rapid variation, and will directly cause UE can't correctly receive switching command, thereby caused handoff failure.As seen, when adopting existing cell switch determining method to carry out switch decision, handover success rate is lower.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of cell switch determining method, to improve handover success rate.
For achieving the above object, the technical scheme of the embodiment of the invention specifically is achieved in that
A kind of cell switch determining method, this method comprises: carry out switch decision according to the wireless signal parameter of obtaining according to switching condition, also comprise:
Influence degree safety thresholding is set;
Obtain the current integrated location parameter of user terminal UE; The current integrated location parameter of described UE comprises: the UE current location is to the influence degree of Serving cell signal;
Judge the UE current location to the influence degree of Serving cell signal more than or equal to influence degree safety thresholding, switching condition is adjusted into satisfies easilier; Judge the UE current location to the influence degree of Serving cell signal less than influence degree safety thresholding, switching condition is adjusted into more difficultly satisfies.
The Target cell of initiating switching can further be set; The current integrated location parameter of described UE can also comprise: UE current location, the current direction of motion of UE and movement velocity;
Judge the UE current location to the influence degree of Serving cell signal more than or equal to influence degree safety thresholding after, may further include: according to the movement tendency of UE current location, the current direction of motion of UE and movement velocity prediction UE, if the movement tendency of UE is to enter the position of influence degree more than or equal to described influence degree safety thresholding, initiate to switch to the Target cell of described setting; Otherwise, carry out described switching condition is adjusted into and satisfy easilier;
Judge the UE current location to the influence degree of Serving cell signal less than influence degree safety thresholding after, may further include: according to the movement tendency of UE current location, the current direction of motion of UE and movement velocity prediction UE, if the movement tendency of UE is to enter the position of influence degree more than or equal to described influence degree safety thresholding, switching condition is adjusted into easier to be satisfied; Otherwise, carry out described switching condition is adjusted into and more difficultly satisfy.
Further, can be divided into N influence degree grade, the switching condition corresponding with each influence degree grade is set according to big young pathbreaker's influence degree of influence degree; Described N is the integer more than or equal to 2; The pass of described switching condition and influence degree is: influence degree is big more, and switching condition is easy more to be satisfied;
Described with switching condition be adjusted into easier satisfy be specifically as follows: according to the UE current location influence degree of Serving cell signal is determined corresponding influence degree grade, switching condition is adjusted into the switching condition of described definite influence degree grade correspondence;
Described with switching condition be adjusted into more difficult satisfy be specifically as follows: according to the UE current location influence degree of Serving cell signal is determined corresponding influence degree grade, switching condition is adjusted into the switching condition of described definite influence degree grade correspondence.
Further, can be divided into N influence degree grade, the switching condition corresponding with each influence degree grade is set according to big young pathbreaker's influence degree of influence degree; Described N is the integer more than or equal to 2; The pass of described switching condition and influence degree is: influence degree is big more, and switching condition is easy more to be satisfied;
Described with switching condition be adjusted into easier satisfy be specifically as follows: according to UE movement tendency institute in-position the influence degree of Serving cell signal is determined corresponding influence degree grade, switching condition is adjusted into the switching condition of described definite influence degree grade correspondence;
Described with switching condition be adjusted into more difficult satisfy be specifically as follows: according to UE movement tendency institute in-position the influence degree of Serving cell signal is determined corresponding influence degree grade, switching condition is adjusted into the switching condition of described definite influence degree grade correspondence.
Further, the obtain frequency corresponding with each influence degree grade can be set; The described pass that obtains frequency and influence degree is: influence degree is big more, and it is high more to obtain frequency;
The frequency of the current integrated location parameter that will obtain wireless signal parameter and UE be adjusted into described definite influence degree grade correspondence obtain frequency the time, can further the frequency of obtaining the current integrated location parameter of wireless signal parameter and UE be adjusted into the frequency of obtaining of described definite influence degree grade correspondence.
Further, the dangerous thresholding of influence degree can be set, and the Target cell of initiating switching is set; The dangerous thresholding of described influence degree is greater than described influence degree safety thresholding;
Judge the UE current location to the influence degree of Serving cell signal more than or equal to the dangerous thresholding of described influence degree, can initiate to switch to the Target cell of described setting, otherwise, can carry out described judgement UE current location to the influence degree of Serving cell signal whether more than or equal to described influence degree safety thresholding.
Preferably, can obtain the influence degree of UE current location to the influence degree three's of described cell signal corresponding relation according to position, sub-district, the described position of UE current location and setting to the Serving cell signal.
As seen from the above technical solution, the cell switch determining method of the embodiment of the invention, by influence degree safety thresholding and the current integrated location parameter of obtaining UE are set: the UE current location is to the influence degree of Serving cell signal, can judge the UE current location to the influence degree of Serving cell signal more than or equal to after the influence degree safety thresholding time, switching condition is adjusted into satisfies easilier; And judging the UE current location less than the influence degree emergency exit in limited time to the influence degree of Serving cell signal, switching condition is adjusted into more difficultly satisfies.So, the present invention combines by the current integrated location parameter with wireless signal parameter and UE and carries out switch decision, and adjust switching condition in real time, when the UE current location is big to the influence degree of Serving cell signal, the result that can make switch decision is that the probability that switches is bigger, thereby improves handover success rate.
The present invention can also be provided with the Target cell that initiate to switch, and the current integrated location parameter by the UE that further obtains: UE current location, the current direction of motion of UE and movement velocity, the movement tendency of prediction UE.In the UE current location influence degree of Serving cell signal is prescribed a time limit more than or equal to the influence degree emergency exit, if the movement tendency of prediction UE is to continue to enter the position of influence degree more than or equal to influence degree safety thresholding, illustrate that there are many factors that make handoff failure in the position that UE is about to enter, at this moment can initiate to switch to the Target cell of described setting in advance.The present invention is by the prediction to the UE movement tendency, and initiation is switched in advance, can effectively avoid switching the influence that is brought such as various unfavorable factors such as rapid fadings to the sub-district, improves handover success rate.
In the UE current location influence degree of Serving cell signal is prescribed a time limit less than the influence degree emergency exit, if the movement tendency of prediction UE is to keep the position of influence degree less than influence degree safety thresholding, switching condition can be adjusted into more difficult satisfied, even can also reduce the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE, the processing resource of saving user terminal and network controls entity; If the movement tendency of UE is to enter the position of described influence degree more than or equal to influence degree safety thresholding, then switching condition can be adjusted into easier to be satisfied, improve handover success rate, even can also improve the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE.
The present invention can further be divided into influence degree N influence degree grade, and corresponding with each influence degree grade frequency and the switching condition of obtaining is set.The set relation of obtaining frequency, switching condition and influencing length is: influence degree is big more, and it is high more to obtain frequency, and switching condition is easy more to be satisfied.When adjusting switching condition, can determine to obtain accordingly intensity and/or switching condition according to the influence degree grade, come switching condition, and the frequency of obtaining the current integrated location parameter of wireless signal parameter and UE is adjusted, make it more to meet current present position of UE or UE movement tendency institute in-position influence degree to Serving cell, this also makes the utilance of processing resource of user terminal and network controls entity obtain further raising, and handover success rate has also obtained further raising.
On the basis of technique scheme, the present invention also provides a kind of method of further raising handover success rate.By the Target cell that is provided with greater than the dangerous thresholding of the influence degree of influence degree safety thresholding and initiates to switch, and before whether the UE current location is judged more than or equal to influence degree safety thresholding the influence degree of Serving cell signal, at first judge the UE current location to the influence degree of Serving cell signal whether more than or equal to the dangerous thresholding of set influence degree, if more than or equal to, the influence degree that this position is described has arrived greatly and has influenced handover success rate, at this moment, can initiate in advance to switch to the Target cell of described setting.Initiate the technical scheme switched in advance by this current integrated location parameter provided by the invention, can effectively avoid switching the influence that is brought to the sub-district, improve handover success rate such as various unfavorable factors such as rapid fadings according to UE.
Description of drawings
Fig. 1 is the schematic flow sheet of cell switch determining method in the embodiment of the invention one;
Fig. 2 is the schematic flow sheet of cell switch determining method in the embodiment of the invention two.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
The main thought of the embodiment of the invention is that influence degree safety thresholding is set, and the current integrated location parameter of the wireless signal parameter obtained and UE combined carries out switch decision.The current integrated location parameter of UE of the present invention comprises at least: the UE current location is to the influence degree of Serving cell signal.In judgement UE current location the influence degree of Serving cell signal is prescribed a time limit more than or equal to the influence degree emergency exit, switching condition is adjusted into easier to be satisfied; In judgement UE current location the influence degree of Serving cell signal is prescribed a time limit less than the influence degree emergency exit, switching condition is adjusted into more difficult satisfied.So, make switch decision under the situation of the current integrated location parameter of taking all factors into consideration wireless signal parameter and UE, to carry out, thereby improve handover success rate.
Easy for describing, the present invention will " UE current location to the influence degree of Serving cell signal less than influence degree safety thresholding " situation be called UE and be in the safety zone, situation that will " UE current location to the influence degree of Serving cell signal more than or equal to influence degree safety thresholding " is called UE and is in the deathtrap.In the specific implementation, can be provided with as required more multi-threshold, divide more multizone.
The current integrated location parameter of UE of the present invention can further include except that comprising the influence degree of UE current location to the Serving cell signal: UE current location, the current direction of motion of UE and movement velocity.
About obtaining the UE current location: the UE current location can and highly be represented by longitude, the latitude of this position.This parameter can be obtained by positioning function or global positioning system (GIS) by UE according to prior art, and periodically or incident report the network controls entity, also can by the network controls entity by positioning function or generalized information system periodically or incident ground obtain, can also cooperate by network controls entity and UE and obtain.
About obtaining the current direction of motion of UE and movement velocity: this parameter equally also can be obtained by the correlation technique of prior art, and this parameter is combined with the UE current location, can predict the movement tendency of UE.
About obtaining the influence degree of UE current location to the Serving cell signal: memory location, sub-district, this position are to the influence degree three's of this cell signal corresponding relation in advance.Wherein, described position can be the zone that meets certain area size; The sub-district can be by cell ID (ID), or the parametric representation that other can the unique identification sub-district.So, according to the sign of Serving cell or other can the unique identification Serving cell parameter, and UE current location just can be determined the influence degree of UE current location to the Serving cell signal." this position is to the influence degree of this cell signal " may be by near the distribution of the building this position, topography and geomorphology information and the factor decision that may have considerable influence to transmission of wireless signals in the described corresponding relation, for example, near the traffic this position, wireless environment etc. all might produce considerable influence to the transmission of wireless signal.The position can provide network related information by operator to the influence degree of cell signal, and provides information such as building and topography and geomorphology to determine by other third parties, and can adjust according to the network actual conditions.
Because diverse location is different to the influence degree of different districts signal, therefore, need be according to this position (perhaps also can be described as this zone) to the influence degree of sub-district, position, sub-district, this position corresponding relation to the influence degree three of this cell signal is set.
For example, suppose all positions to be divided into two classes: safety zone and deathtrap according to set influence degree safety thresholding.Sub-district A covers position 1,2, and sub-district B covers position 2,3, and sub-district C covers position 1,3.If certain high building in the position 2 has influenced the transmission of wireless signals of sub-district B, then the influence degree of 2 pairs of sub-districts, position B signal may be dangerous; And concerning the A of sub-district, may not have the factor that transmission of wireless signals is existed considerable influence in the position 2, then the influence degree of the 2 pairs of sub-district a-signals in position just can be a safety.Corresponding to described example, position as shown in table 1, sub-district, this position corresponding relation to the influence degree three of this cell signal can be set:
| The position | The sub-district | The influence degree grade |
| 1 | A | Safety |
| 2 | A | Safety |
| 2 | B | Dangerous |
| 3 | B | Safety |
| 1 | C | Dangerous |
| 3 | C | Safety |
| ...... | ...... | ...... |
Table 1
When judging that UE is in the safety zone, switching condition can be adjusted into and more difficultly satisfy, and, can reduce the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE.When judging that UE is in the deathtrap, switching condition can be adjusted into and satisfy easilier, and can improve the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE.
If further comprise in the current integrated location parameter of the UE that gets access to: the current location of UE, the current direction of motion of UE and movement velocity, then can predict, and handle accordingly according to predicting the outcome to the movement tendency of UE.Particularly:
When UE is in the safety zone, if the movement tendency of UE is for keeping the safety zone, then switching condition can be adjusted into more difficult satisfy maybe can keep switching condition constant, correspondingly, can reduce the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE, or keep that described to obtain frequency constant; If the movement tendency of UE for entering the deathtrap, then can be adjusted into switching condition easier to be satisfied, correspondingly, can improve the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE.
When UE is in the deathtrap, if the movement tendency of UE for continuing to enter the deathtrap, then can initiate to switch in advance.At this moment, will set in advance the Target cell of initiating switching among network controls entity or the UE, it is to initiate to switch to set Target cell that described initiation is switched.For the movement tendency of UE be the holding position constant, enter situations such as safety zone, can corresponding processing mode be set according to the needs of practical application.For example, be the constant situation in holding position for the movement tendency of UE, can keep switching condition and obtain the frequency of current integrated location parameter of wireless signal parameter and UE constant; And be the situation that enters the safety zone for the movement tendency of UE, switching condition can be adjusted into and more difficultly satisfy, and correspondingly reduce the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE.
Preferably, can also be divided into N influence degree grade according to big young pathbreaker's influence degree of influence degree, N is more than or equal to 2; And the setting switching condition corresponding with each influence degree grade.The set switching condition and the relation of influence degree are: influence degree is big more, and switching condition is easy more to be satisfied.Like this, just can be according to the UE current location to the influence degree of Serving cell signal or UE movement tendency institute in-position to the influence degree of Serving cell signal, adjust switching condition in real time.If further be provided with influence degree grade and the corresponding relation that obtains frequency, so, when adjusting switching condition, can also adjust the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE, make UE when the deathtrap, handoff decision result is that the probability that switches is higher, thereby improves handover success rate.
Further, the corresponding relation of suggestiveness information and influence degree can also be set in UE, and make UE obtain the UE current location to the influence degree of Serving cell signal or UE movement tendency institute in-position influence degree to the Serving cell signal, like this, UE just can determine corresponding suggestiveness information to the influence degree or the UE movement tendency institute in-position of Serving cell signal to the influence degree of Serving cell signal according to the UE current location, and this suggestiveness information is reported the network controls entity.Described suggestiveness information is the suggestiveness information about switch decision, and for example: whether whether suggestion network controls entity initiate to switch, adjust and obtain frequency, whether adjust switching condition etc.When suggestiveness information can or report the current integrated location parameter of UE at the UE reporting measurement reports, report to the network controls entity.
On the basis of technique scheme, can also further be provided with greater than the dangerous thresholding of the influence degree of influence degree safety thresholding, the situation that the present invention will " UE current location to the influence degree of Serving cell signal more than or equal to the dangerous thresholding of influence degree " is called UE and is in utmost point danger zone.Judging that UE is in the safety zone still be before the deathtrap, can judge at first whether UE is in utmost point danger zone, if be in utmost point danger zone, then directly initiation switching.As previously mentioned, can set in advance the Target cell of initiating switching among network controls entity or the UE, it is to initiate to switch to set Target cell that described initiation is switched.Like this, need not to proceed switch decision, can effectively avoid switching the influence that is brought to the sub-district, improve handover success rate such as various unfavorable factors such as rapid fadings.
More than summarized the execution mode of technical solution of the present invention, below by two more specific embodiment describe the embodiment of cell switch determining method of the present invention in detail.
Embodiment one:
Present embodiment is provided with influence degree safety thresholding; The current integrated location parameter of UE only comprises: the UE current location is to the influence degree of Serving cell signal; According to the UE current location influence degree of Serving cell signal is adjusted switching condition.
Fig. 1 is the schematic flow sheet of cell switch determining method in the embodiment of the invention one.Referring to Fig. 1, this method may further comprise the steps:
Step 101: influence degree safety thresholding is set.
In this step, influence degree safety thresholding can be provided with according to the quality of network wireless environment, for example, when wireless environment is better, higher influence degree safety thresholding can be set.
Step 102: the current integrated location parameter of obtaining wireless signal parameter and UE.
In this step, the current integrated location parameter of UE only comprises: the UE current location is to the influence degree of Serving cell signal.The wireless signal parameter is reported in measurement report by UE, and the current integrated location parameter of UE can be obtained according to foregoing mode.For example: by UE periodically or incident reports, by the network controls entity periodically or incident is obtained or obtained etc. by UE and the cooperation of network controls entity, do not repeat them here.
As previously mentioned, in this step, UE can provide suggestiveness information about switch decision to the network controls entity when the current integrated location parameter of reporting measurement reports or UE simultaneously.The corresponding relation of suggestiveness information and influence degree grade need be set in this case; UE need obtain the influence degree of UE current location to the Serving cell signal, or UE movement tendency institute in-position is to the influence degree of Serving cell signal, and provides corresponding suggestiveness information according to described influence degree grade to the network controls entity.
Step 103: judge whether UE is in the deathtrap, if judged result for being in the deathtrap, then continues execution in step 104; If judged result continues execution in step 105 for being in the safety zone.
Step 104: switching condition is adjusted into satisfies easilier, continue execution in step 106.
In this step, switching condition is adjusted into satisfies easilier, then the result of switch decision is that the probability that switches will higher, and owing to the current deathtrap that is in of UE, at this moment, the probability that switches uprises, and will improve handover success rate.
Step 105: switching condition is adjusted into more difficult satisfied.
Step 106: carry out switch decision according to the wireless signal parameter of obtaining according to switching condition, if court verdict for switching, then continues execution in step 107, otherwise, return execution in step 102.
In this step, 107 described initiations are switched if the result of switch decision, then can continue execution in step for switching; If the result of switch decision can return step 102 for not switching, continue to carry out the operation of the current integrated location parameter that gets access to wireless signal parameter and UE.
Step 107: initiate to switch, return execution in step 102 after switching is finished.
So far, finish the flow process of present embodiment cell switch determining method.
In above-mentioned steps 101, a dangerous thresholding of influence degree greater than influence degree safety thresholding can also be set, the influence degree of the dangerous thresholding correspondence of this influence degree has arrived greatly and has influenced handover success rate, therefore, before execution in step 103 described judgement UE zone of living in, can judge earlier the UE current location to the influence degree of Serving cell signal whether more than or equal to the dangerous thresholding of set influence degree, if more than or equal to, that is: UE is in utmost point danger zone, at this moment, can directly initiate to switch to the Target cell that sets in advance.In the UE current location influence degree of Serving cell signal during less than the dangerous thresholding of set influence degree, is continued execution in step 103.The dangerous thresholding of influence degree safety thresholding that the present invention is set and influence degree also can be adjusted according to the needs of network actual motion.
In above-mentioned steps 104 and 105, when adjusting switching condition, can carry out according to the grade of influence degree.Particularly: can be divided into N influence degree grade according to big young pathbreaker's influence degree of influence degree, and the switching condition corresponding with each influence degree grade is set more than or equal to 2.The principle that the corresponding relation of switching condition and influence degree is set is: influence degree is big more, and switching condition is easy more to be satisfied.When operation that carry out to adjust switching condition, can determine corresponding influence degree grade to the influence degree of Serving cell signal according to the UE current location, switching condition is adjusted into the switching condition of described definite influence degree grade correspondence.
Further, if the current integrated location parameter of UE is taked the mode that periodically reported by UE, then the network controls entity can be adjusted into switching condition easier when satisfying, and notice UE improves the frequency of the current integrated location parameter that reports wireless signal parameter and UE; If the current integrated location parameter of UE is taked the mode that reported by the UE incident, then the network controls entity can switching condition is adjusted into easier when satisfying, notice UE changes the condition that trigger event reports, the frequency that makes it to report is improved, thereby reaches the purpose of the frequency that improves the current integrated location parameter that reports wireless signal parameter and UE.
Preferably, the obtain frequency corresponding with each influence degree grade can be set also, the principle that the corresponding relation that obtains frequency and influence degree is set is: influence degree is big more, obtains frequency.When switching condition being adjusted into the switching condition of corresponding influence degree grade correspondence, can further adjust the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE.
As seen from the above-described embodiment, the cell switch determining method of the embodiment of the invention, by influence degree safety thresholding being set and obtaining the influence degree of UE current location, can when judging that UE is in the deathtrap, switching condition be adjusted into easier to be satisfied to the Serving cell signal; And when judging that UE is in the safety zone, switching condition is adjusted into more difficult satisfied.So, combine by current integrated location parameter and to carry out switch decision, and adjust switching condition in real time, when UE is in the deathtrap wireless signal parameter and UE, the result that can make switch decision is that the probability that switches is bigger, thereby improves handover success rate.
And, when adjusting switching condition, can adjust the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE, make switching condition dangerous more easy more satisfied, thereby realize initiating in advance to switch, thereby improve handover success rate in UE zone of living in.
In addition, by influence degree grade and the corresponding relation that obtains corresponding relation, influence degree grade and the switching condition of frequency are set, can obtain the frequency of the current integrated location parameter of wireless signal parameter and UE in adjustment, during with the adjustment switching condition, carry out according to the influence degree grade, make described adjustment more meet the influence degree of current UE present position to the Serving cell signal, this also can further improve handover success rate.
On the basis of technique scheme, may further include in the current integrated location parameter of UE: UE current location, the current direction of motion of UE and movement velocity, thus realize prediction to the UE movement tendency, and handle accordingly according to predicting the outcome.Below by embodiment two this is elaborated.
Embodiment two:
Fig. 2 is the schematic flow sheet of cell switch determining method in the embodiment of the invention two.Referring to Fig. 2, this method may further comprise the steps:
Step 201: the dangerous thresholding of influence degree safety thresholding and influence degree is set.
In this step, the dangerous thresholding of set influence degree is greater than influence degree safety thresholding.
Step 202: the current integrated location parameter of obtaining wireless signal parameter and UE.
In this step, the current integrated location parameter of the UE that is obtained comprises: the UE current location is to influence degree, UE current location, the current direction of motion of UE and the movement velocity of Serving cell signal.
Step 203: judge the current utmost point danger zone that whether is in of UE,, then continue execution in step 210 if it is regional to be in utmost point danger; Otherwise, continue execution in step 204.
In this step, judge the current utmost point danger zone that whether is in of UE, promptly according to the sign of UE current location and Serving cell, inquire about set position, sub-district, this position corresponding relation, judge whether the UE current location is utmost point danger to the influence degree of Serving cell signal the influence degree three of this cell signal.
Step 204: whether be in deathtrap, if be in the deathtrap, then continue execution in step 205 if judging that UE is current; Otherwise, continue execution in step 207.
In this step, judge the current deathtrap that whether is in of UE, promptly according to the sign of UE current location and Serving cell, inquire about set position, sub-district, this position corresponding relation, judge whether the UE current location is dangerous to the influence degree of Serving cell signal the influence degree three of this cell signal.
Step 205: according to the movement tendency of UE current location, the current direction of motion of UE and movement velocity prediction UE, if the movement tendency of UE then continues execution in step 210 for entering the deathtrap; Otherwise, continue execution in step 206.
Step 206: improve the frequency of the current integrated location parameter obtain wireless signal parameter and UE, switching condition is adjusted into satisfies easilier, continue execution in step 209.
Step 207: according to the movement tendency of UE current location, the current direction of motion of UE and movement velocity prediction UE, if the movement tendency of UE then continues execution in step 206 for entering the deathtrap; Otherwise, continue execution in step 208.
Step 208: reduce the frequency of the current integrated location parameter of obtaining wireless signal parameter and UE, switching condition is adjusted into more difficult satisfied.
Step 209: carry out switch decision according to the wireless signal parameter of obtaining according to switching condition, if court verdict for switching, then continues execution in step 210, otherwise, return execution in step 202.
Step 210: initiate to switch.
So far, finish the cell switch determining method of this preferred embodiment.
In the flow process shown in Figure 2, after switching is finished, also can continue to return step 202, carry out switch decision next time.
Present embodiment has further improved handover success rate by two measures on the basis of embodiment one described technical scheme.One is: according to the movement tendency of UE current location, the current direction of motion of UE and movement velocity prediction UE, if the current movement tendency of deathtrap and UE that is in of UE is for entering the deathtrap, illustrate that there are many factors that make handoff failure in the position that UE is about to enter, at this moment can initiate in advance to switch to the Target cell that sets in advance.Another is: be provided with greater than the dangerous thresholding of the influence degree of influence degree safety thresholding, in that current zone of living in is that the safety zone still is before the deathtrap is judged to UE, judge at first whether UE is in utmost point danger zone, if be in utmost point danger zone, the influence degree that this position is described has arrived greatly and has influenced handover success rate, at this moment, also can initiate in advance to switch to the Target cell that sets in advance.The current integrated location parameter according to UE that provides by present embodiment is initiated the technical scheme switched in advance, can effectively avoid switching the influence that is brought such as various unfavorable factors such as rapid fadings to the sub-district, improves handover success rate.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1, a kind of cell switch determining method carries out switch decision according to the wireless signal parameter of obtaining according to switching condition, it is characterized in that, comprising:
Influence degree safety thresholding is set;
Obtain the current integrated location parameter of user terminal UE; The current integrated location parameter of described UE comprises: the UE current location is to the influence degree of Serving cell signal;
Judge the UE current location to the influence degree of Serving cell signal more than or equal to influence degree safety thresholding, switching condition is adjusted into satisfies easilier; Judge the UE current location to the influence degree of Serving cell signal less than influence degree safety thresholding, switching condition is adjusted into more difficultly satisfies.
2, method according to claim 1 is characterized in that, the Target cell of initiating switching further is set;
The current integrated location parameter of described UE also comprises: UE current location, the current direction of motion of UE and movement velocity;
Judge the UE current location to the influence degree of Serving cell signal more than or equal to influence degree safety thresholding after, further comprise: according to the movement tendency of UE current location, the current direction of motion of UE and movement velocity prediction UE, if the movement tendency of UE is to enter the position of influence degree more than or equal to described influence degree safety thresholding, initiate to switch to the Target cell of described setting; Otherwise, carry out described switching condition is adjusted into and satisfy easilier;
Judge the UE current location to the influence degree of Serving cell signal less than influence degree safety thresholding after, further comprise: according to the movement tendency of UE current location, the current direction of motion of UE and movement velocity prediction UE, if the movement tendency of UE is to enter the position of influence degree more than or equal to described influence degree safety thresholding, switching condition is adjusted into easier to be satisfied; Otherwise, carry out described switching condition is adjusted into and more difficultly satisfy.
3, method according to claim 1 is characterized in that, further the big young pathbreaker's influence degree according to influence degree is divided into N influence degree grade, and the switching condition corresponding with each influence degree grade is set; Described N is the integer more than or equal to 2; The pass of described switching condition and influence degree is: influence degree is big more, and switching condition is easy more to be satisfied;
Described with switching condition be adjusted into easier satisfy be specially: according to the UE current location influence degree of Serving cell signal is determined corresponding influence degree grade, switching condition is adjusted into the switching condition of described definite influence degree grade correspondence;
Described with switching condition be adjusted into more difficult satisfy be specially: according to the UE current location influence degree of Serving cell signal is determined corresponding influence degree grade, switching condition is adjusted into the switching condition of described definite influence degree grade correspondence.
4, method according to claim 2 is characterized in that, further the big young pathbreaker's influence degree according to influence degree is divided into N influence degree grade, and the switching condition corresponding with each influence degree grade is set; Described N is the integer more than or equal to 2; The pass of described switching condition and influence degree is: influence degree is big more, and switching condition is easy more to be satisfied;
Described with switching condition be adjusted into easier satisfy be specially: according to UE movement tendency institute in-position the influence degree of Serving cell signal is determined corresponding influence degree grade, switching condition is adjusted into the switching condition of described definite influence degree grade correspondence;
Described with switching condition be adjusted into more difficult satisfy be specially: according to UE movement tendency institute in-position the influence degree of Serving cell signal is determined corresponding influence degree grade, switching condition is adjusted into the switching condition of described definite influence degree grade correspondence.
5, according to claim 3 or 4 described methods, it is characterized in that, the obtain frequency corresponding with each influence degree grade further is set; The pass of described switching condition and influence degree is: influence degree is big more, and it is high more to obtain frequency;
The frequency of the current integrated location parameter that will obtain wireless signal parameter and UE be adjusted into described definite influence degree grade correspondence obtain frequency the time, the frequency that further will obtain the current integrated location parameter of wireless signal parameter and UE is adjusted into the frequency of obtaining of described definite influence degree grade correspondence.
6, according to each described method of claim 1 to 4, it is characterized in that, the dangerous thresholding of influence degree further is set, and the Target cell of initiating switching is set; The dangerous thresholding of described influence degree is greater than described influence degree safety thresholding;
Judge the UE current location to the influence degree of Serving cell signal more than or equal to the dangerous thresholding of described influence degree, initiate to switch to the Target cell of described setting, otherwise, carry out described judgement UE current location to the influence degree of Serving cell signal whether more than or equal to described influence degree safety thresholding.
7, according to each described method of claim 1 to 4, it is characterized in that, the influence degree three's of described cell signal corresponding relation is obtained the influence degree of UE current location to the Serving cell signal according to position, sub-district, the described position of UE current location and setting.
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