CN102264108B - Method and equipment for adjusting mobility parameters - Google Patents

Abstract

The embodiment of the invention discloses a method and equipment for adjusting mobility parameters. The method comprises the following steps that: a source base station evaluates parameters according to the mobility parameters and configuration parameters of a target base station to acquire parameter adjustment suggestion information, and sends the parameter adjustment suggestion information to the target base station; and the source base station sends a parameter updating notice to the target base station and adjusts the mobility parameters after confirmation information from the target base station is received. By the embodiment of the invention, the success rate of parameter consultation and the convergence of load balancing can be improved.

Description

A kind of method of adjustment of mobility parameters and equipment

Technical field

The present invention relates to mobile communication technology field, particularly relate to a kind of method of adjustment and equipment of mobility parameters.

Background technology

Along with the development of the communication technology, reduce the complexity of operational administrative work and reduce operation maintenance cost, become an urgent demand of common carrier.In following mobile communication system, for example LTE (Long TermEvolution, Long Term Evolution) in system, by introducing the mechanism of network self-organization, by network according to statistic Automatic Optimal parameter, can reduce the artificial participation of the network planning and Operation and Maintenance, reduce construction and the operation cost of network.

Based on above-mentioned background, 3GPP (3rd Generation Partnership Project, the 3rd generation partner program) by E-UTRAN (Evolved UMTS Terrestrial Radio Access Network, the universal mobile telecommunications system terrestrial wireless access of evolution) SON (Self Organizing Networks in system, self-organizing network) technology studies as work subject under discussion, and SON technology comprises self-configuring, self-optimizing and certainly cures.Wherein, self-optimizing is a key property wherein, need to monitor some networks and system performance parameter as input, as the statistics of network performance index, fault warning, notice etc., after to input data analysis, optimized algorithm makes a policy, the last adjustment operation that automatically triggers relevant network node, if necessary, also can be by manual activation.Carry out intra-LTE and inter-RAT (Radio Access Technology for the load of this community and adjacent area, wireless access technology) the self-optimizing of mobility parameters, compare and be not optimized, can effectively improve the capacity of system, also can reduce the workload of manual intervention network management and optimization.

MLB (Mobility Load Balancing, moving load equilibrium) be the important research use-case in SON self-optimization function, its basic target is: mean allocation load in LTE minizone and between different RAT, realize the load balancing between community by reselecting parameters and the handoff parameter of optimizing community, minimize and switch and redirected quantity by load balancing, to improve the capacity of whole network, and improve user's experience.Therefore, load balancing should not have a negative impact to user's QoS (Quality of Service, service quality), and the user that this impact can not exceed in the normal mobility situation that there is no load balancing experiences.In the load balancing of Inter-RAT, adopt RIM (RAN Information Management, wireless access network information management) mechanism to carry out the mutual of message, relevant message is placed in a container, to facilitate follow-up expansion.In the MLB of intra-LTE, parameter negotiation mainly adopts normalized parameter, the position of the handoff boundary band of this Parametric Representation community, and the parameter that each community can be relevant according to algorithm adjustment is separately to realize the variation of switching band.

The inter-RAT cell reselection of all E-UTRAN of relating to all mode based on priority carries out, for E-UTRAN and UTRAN (UMTS Terrestrial Radio Access Network, the access of universal mobile telecommunications system terrestrial wireless), each frequency can have independent priority; For GERAN (GSM/EDGE Radio Access Network, global system for mobile communications/enhanced data rates global system for mobile communications evolution technology wireless access network), each group of frequencies can have independent priority.

Particularly, LTE cell reselection comprises to the condition of UTRAN community:

(1) for frequency priority higher than for the frequency of current use frequency, need to meet following relation:

S _{noservingcell，x}＞Thresh _{x，high(UtranInLTE)}

Wherein, S _{noservingcell, x}for the signal strength signal intensity of the current non-resident community of UE (being the Target cell of gravity treatment) that defines in TS36.304 agreement; Thresh _{x, high}for the triggering thresholding that resides in high priority frequency defining in TS36.304 agreement; Thresh _{x, high (UtranInLTE)}in LTE system, the frequency priority of UTRAN is during higher than the frequency of current service LTE community, the thresholding of triggering cell gravity treatment.

(2) for frequency priority lower than for the frequency of current use frequency, need to meet following relation:

S _serving＜S _{non?int?rasearch}

And, S _serving< Thresh _{serving, low (lte)}

And, S _{nonservingcell, x}> Thresh _{x, low (utranInLTE)}

Wherein, S _servingfor the signal strength signal intensity of the resident community of current UE; S _{non int rasearch}for the thresholding of the measurement of the triggering different frequency/different system that stipulates in TS36.304 agreement, the signal strength signal intensity of current service cell during lower than this thresholding, triggers the measurement of different frequency/different system; Thresh _{serving, low}for the triggering thresholding of the cell reselection of the low priority that defines in TS36.304 agreement; Thresh _{serving, low (lte)}in LTE system, the triggering thresholding of the cell reselection of low priority; Thresh _{x, low}for the triggering thresholding that resides in low priority frequency defining in TS36.304 agreement; Thresh _{x, low (UtranInLTE)}represent in LTE system, the frequency priority of UTRAN is during lower than the frequency of current service LTE community, the thresholding of triggering cell gravity treatment.The signal strength signal intensity of current frequency is lower than Thresh _{serving, low (lte)}and the frequency of Target cell is higher than Thresh _{x, low (UtranInLTE)}time, the cell reselection of triggering low priority.

Other communities, after at least 1 second, could gravity treatment be arrived in the resident DaoLTE of UE community.

The event that LTE switches community comprises B1 event and B2 event.

Wherein, the Rule of judgment of B1 event is:

Mn+Ofn-Hys＞Thresh

The Rule of judgment of B2 event is:

Ms+Hys＜Thresh1

And, Mn+Ofn-Hys > Thresh2

Wherein, the signal strength signal intensity that Mn is adjacent area, OFn is the skew of the frequency of adjacent area use, Hys is sluggish parameter, the threshold parameter that Thresh is event, the signal strength signal intensity of MsWei Zhe community.

The condition of UTRAN cell reselection DaoLTE community is as follows:

(1) for frequency priority higher than for the frequency of current use frequency, need to meet following relation:

S _{noservingcell，x}＞Thresh _{x，high(UtranInLTE)}

Wherein, S _{noservingcell, x}for the signal strength signal intensity of the current non-resident community of UE (being the Target cell of gravity treatment) that defines in TS25.304 agreement; Thresh _{x, high}for the triggering thresholding that resides in high priority frequency defining in TS25.304 agreement; Thresh _{x, high (UtranInLTE)}in UTRAN system, the frequency priority of LTE is during higher than the frequency of the UTRAN community of current service, the thresholding of triggering cell gravity treatment.

(2) for frequency priority lower than for the frequency of current use frequency, need to meet following relation:

For frequency priority lower than current use frequency, there is following relation:

S _serving＜S _{prioritysearch}

And, S _serving< Thresh _{serving, low (Utran)}

And, S _{nonservingcell, x}> Thresh _{x, low (LTEinUtran)}

Wherein, S _servingfor the signal strength signal intensity of the resident community of current UE; S _{prioritysearch}for the thresholding of the measurement of the triggering different frequency/different system that stipulates in TS25.304 agreement, the signal strength signal intensity of current service cell during lower than this thresholding, triggers the measurement of different frequency/different system; Thresh _{serving, low}for the triggering thresholding of the cell reselection of the low priority that defines in TS25.304 agreement; Thresh _{serving, low (Utran)}in UTRAN system, the triggering thresholding of the cell reselection of low priority; Thresh _{x, low}for the triggering thresholding that resides in low priority frequency defining in TS25.304 agreement; Thresh _{x, low (LTEInUtran)}in UTRAN system, the frequency priority of LTE is during lower than the frequency of the UTRAN community of current service, the thresholding of triggering cell gravity treatment.The signal strength signal intensity of current frequency is lower than Thresh _{serving, low (Utran)}and the frequency of Target cell is higher than Thresh _{x, low (LTEInUtran)}time, the cell reselection of triggering low priority.

Inventor is realizing in process of the present invention, and at least there are the following problems to find prior art:

(1) parameter negotiation in 3GPP R9 has only been consulted and has been switched relevant parameter, and adjust reselecting parameters according to the variation of switching band, but in inter-RAT scene, reselection modes and switching mode difference to some extent, if continue to adopt the negotiation mode of R9 intra-LTE, will make base station cannot adjust reselecting parameters.

(2) because the network configuration of inter-RAT is layering scene, in some scene, there will not be by the different system of Event triggered and switch, but adopt the switching of side Network Based to complete the transfer of load.In addition, the switching between a large amount of systems can increase the load of core net, and for the switching between homologous ray, the switching time between system is longer, can cause user's experience to decline.

(3), in existing protocol procedures, before parameter negotiation, the measurement event configuring between the parameter that the community of two different systems cannot be known and gravity treatment is relevant and different system, cannot determine relevant gravity treatment and switch band.In the time that parameter adjustment makes mistakes, can cause the mobility problem such as ping-pong reselection, pingpang handoff, cause terminal to be difficult to normally be linked in any one network, affect terminal and normally use, reduce user's experience.

Summary of the invention

The embodiment of the present invention provides a kind of method of adjustment and equipment of mobility parameters, for improving the success rate of parameter negotiation.

The embodiment of the present invention proposes a kind of method of adjustment of mobility parameters, comprises the following steps:

Source base station carries out parameter evaluation according to the mobility parameters of target BS and configuration parameter, obtains parameter adjustment advisory information, and described parameter adjustment advisory information is sent to described target BS;

Described source base station receives after the confirmation from described target BS, sends parameter update notification, and carry out the adjustment of mobility parameters to described target BS.

The embodiment of the present invention also proposes a kind of method of adjustment of mobility parameters, comprises the following steps:

Target BS receives the parameter adjustment advisory information from source base station, and described parameter adjustment advisory information is carried out to parameter evaluation;

In the time that described parameter adjustment advisory information assessment is passed through, described target BS sends confirmation to described source base station;

Described target BS receives the parameter update notification from described source base station, and carries out the adjustment of mobility parameters.

The embodiment of the present invention also proposes a kind of source base station, comprising:

The first evaluation module, for carrying out parameter evaluation according to the mobility parameters of target BS and configuration parameter, obtains parameter adjustment advisory information;

The first transceiver module, for send the parameter adjustment advisory information that described the first evaluation module obtains to described target BS, when after the confirmation receiving from described target BS, sends parameter update notification to described target BS;

The first adjusting module, for carrying out the adjustment of mobility parameters.

The embodiment of the present invention also proposes a kind of target BS, comprising:

The second transceiver module, for receiving the parameter adjustment advisory information from source base station, in the time that the second evaluation module passes through described parameter adjustment advisory information assessment, sends confirmation to described source base station, and receives the parameter update notification from described source base station;

The second evaluation module, carries out parameter evaluation for the parameter adjustment advisory information that described the second transceiver module is received;

The second adjusting module, for carrying out the adjustment of mobility parameters.

The technical scheme of the embodiment of the present invention has the following advantages, carry out the mobility parameters of two different system cell intercorrelations of parameter adjustment, realize parameter negotiation and parameter evaluation, and carry out parameter adjustment in conjunction with mobility parameters and the configuration parameter of two different system cells, with the distribution situation of change of load, reduce because parameter is not mated the mobility problem such as ping-pong reselection, pingpang handoff of initiation, improve the success rate of parameter negotiation, and guarantee user's QoS.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the method for adjustment flow chart of the mobility parameters in the embodiment of the present invention;

Fig. 2 is the focus covering scene schematic diagram in the embodiment of the present invention;

Fig. 3 is the method for adjustment flow chart of the mobility parameters in focus covering scene;

Fig. 4 is the common covering scene schematic diagram in the embodiment of the present invention;

Fig. 5 is the method for adjustment flow chart of the mobility parameters in common covering scene;

Fig. 6 is the adjacent scene schematic diagram in the embodiment of the present invention;

Fig. 7 is the method for adjustment flow chart of the mobility parameters in adjacent scene;

Fig. 8 is the source base station structural representation in the embodiment of the present invention;

Fig. 9 is the target BS structural representation in the embodiment of the present invention.

Embodiment

The embodiment of the present invention provides a kind of adjustment scheme of mobility parameters, in this scheme, source base station carries out parameter evaluation according to the mobility parameters of target BS and configuration parameter, obtains parameter adjustment advisory information, and this parameter adjustment advisory information is sent to target BS.Target BS carries out parameter evaluation to the parameter adjustment advisory information receiving, and in the time that parameter evaluation passes through, sends confirmation to source base station.Source base station sends parameter update notification according to the confirmation receiving to target BS, and carry out the adjustment of mobility parameters according to the parameter updated time of carrying in parameter update notification with target BS, thereby avoid not mating due to parameter the mobility problem such as ping-pong reselection, pingpang handoff of initiation, improved the success rate of parameter negotiation.

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

In the embodiment of the present invention, source base station and target BS be adjacent base station each other, can carry out the exchange of mobility parameters and configuration parameter.Wherein, mobility parameters can be including but not limited to one of following and combination: the frequency re-selections priority list of the handover configurations of different system, current area and the gravity treatment of current area configuration in current area; Configuration parameter can be including but not limited to one of following and combination: the geographical position of current area, the target coverage radius of current area and the transmitting power of current area.In addition, between source base station and target BS, can also exchange the parameter type that request target side provides.

Source base station and target base station exchange mobility parameters and relevant configuration parameter can be periodically, can be also the modes of Event triggered, and this trigger event can be moving load balance optimizing, mobile robustness optimization or the congestion control of loading.Source base station and target BS obtain the other side's mobility parameters and the mode of relevant configuration parameter can be for being undertaken mutual or obtaining from OAM system by dedicated signaling, in the time adopting the mode of dedicated signaling mutual, can be undertaken alternately by handoff procedure, also relevant parameter can be placed in a container, be undertaken alternately by RIM mechanism.

As shown in Figure 1, be the method for adjustment flow chart of the mobility parameters in the embodiment of the present invention, comprise the following steps:

Step 101, source base station carries out parameter evaluation according to the mobility parameters of target BS and configuration parameter, obtains parameter adjustment advisory information.

Particularly, source base station can be determined according to the mobility parameters of self and target BS and configuration parameter the covering scene of source base station and target BS, select need the mobility parameters of adjusting and obtain the mobility parameters after adjustment according to described covering scene, obtain comprising the parameter adjustment advisory information of the mobility parameters after this adjustment.Wherein, determining when covering scene, can or judge the relative position relation of Liang Ge community by the relevant parameter of exchange according to the configuration of OAM system, for follow-up parameter is selected and the decision-making of other MLB provides basic; In the time selecting to adjust parameter, can be in conjunction with concrete MLB algorithm and covering scene, and select suitable adjustment parameter according to the information on load of cell-of-origin and Target cell, obtain the parameter adjustment advisory information of the adjustment parameter that comprises selection, and the adjustment parameter of selecting need to meet and not produce the principle such as pingpang handoff, ping-pong reselection.

Step 102, source base station sends parameter adjustment advisory information to target BS.

Particularly, source base station utilizes RIM process to send parameter adjustment advisory information to Target cell, and parameter adjustment advisory information can comprise one or more scheme, and each scheme is including but not limited to one of following information or combine:

The relevant parameter of handover configurations is adjusted in a.Zhe community, for example, and thresholding in B1 and B2 event parameters such as () Ofn and Thresh;

The relevant parameter of gravity treatment configuration is adjusted in b.Zhe community, and for example, the gravity treatment of low priority frequency triggers thresholding Thresh _{x, low};

The frequency priority lists that c.Zhe community is adjusted;

D. the relevant parameter of switching that Target cell need to be adjusted, for example, the dependent threshold of 3a event;

E. the gravity treatment relevant parameter that Target cell need to be adjusted, for example, the gravity treatment of low priority frequency triggers thresholding Thresh _{x, low};

F. the frequency priority lists that Target cell is adjusted.

Step 103, target BS carries out parameter evaluation to parameter adjustment advisory information, if parameter evaluation passes through, performs step 104; Otherwise, execution step 107.

Particularly, target BS can combining target community and the parameter adjustment advice message that load distributes and relevant strategy provides source base station of all adjacent areas, judge whether the adjustment parameter of carrying in parameter adjustment advisory information meets the principle that does not produce pingpang handoff and ping-pong reselection, to determine whether the accepting adjustment parameter that parameter adjustment advice message comprises, prevent the appearance of the unnecessary mobility problem such as ping-pong reselection, pingpang handoff that wrong parameter adjustment causes.In addition, for the relevant parameter of adjusting based on frequency, target BS also needs to assess the impact that this parameter adopts the adjacent area of same frequency to produce on other, and estimates the variation of load.

Step 104, target BS returns to confirmation to source base station.

Particularly, if target BS is accepted the parameter adjustment advice message from source base station, to source base station feedback acknowledgment information, in this confirmation, comprise the ID of acceptable scheme in time that Target cell parameter can upgrade and parameter adjustment advice message.Wherein, the time that Target cell parameter can be upgraded can be a time point, can be also an effective time period.

Step 105, source base station sends parameter update notification to target BS.

Wherein, in parameter update notification, can comprise cell-of-origin and prepare the moment of carrying out parameter renewal, the time that can upgrade that this moment needs reference target community to provide in confirmation.

Step 106, source base station and target BS carry out the adjustment of mobility parameters according to the parameter updated time of carrying in parameter update notification.

Wherein, the mobility parameters of adjustment can comprise handover configurations, the frequency re-selections priority list of current area and the gravity treatment of the current area configuration of different system in current area.

Step 107, target BS returns to exclude information to source base station.

Particularly, if the scheme of all recommendations can not be accepted by Target cell in parameter adjustment advice message, target BS returns to exclude information to source base station, can comprise one group or organize suggested design in this exclude information more.

Step 108, source base station is assessed the parameter adjustment scheme of carrying in exclude information, obtains parameter adjustment advisory information.

Particularly, when source base station receives exclude information, and while carrying parameter adjustment scheme in exclude information, source base station is assessed parameter adjustment scheme, initiates new parameter-negotiation procedure.Source base station can judge whether parameter adjustment scheme meets the principle that does not produce pingpang handoff and ping-pong reselection, if meet the principle that does not produce pingpang handoff and ping-pong reselection, be parameter adjustment scheme evaluation by time, source base station generates the parameter adjustment advisory information of carrying this parameter adjustment scheme; If do not meet the principle that does not produce pingpang handoff and ping-pong reselection, when parameter adjustment scheme evaluation does not pass through, source base station carries out parameter evaluation according to the mobility parameters of target BS and configuration parameter, obtains parameter adjustment advisory information.

Wherein, source base station judges whether parameter adjustment scheme meets while not producing the principle of pingpang handoff and ping-pong reselection, can be according to handoff parameter and the reselecting parameters in the covering scene of source base station and target BS and parameter adjustment scheme, obtain switching scope and the gravity treatment scope of cell-of-origin and Target cell, and judge whether to produce pingpang handoff according to whether the switching scope of the switching scope of cell-of-origin and Target cell is overlapping, judge whether to produce ping-pong reselection according to whether the gravity treatment scope of the gravity treatment scope of cell-of-origin and Target cell is overlapping.

It should be noted that, execute after this step, can continue to perform step 102.

In the step 103 of flow process shown in above-mentioned Fig. 1, target BS judges whether the adjustment parameter of carrying in parameter adjustment advisory information meets while not producing the principle of pingpang handoff and ping-pong reselection, can be according to handoff parameter and the reselecting parameters in the covering scene of source base station and target BS and parameter adjustment advisory information, obtain switching scope and the gravity treatment scope of cell-of-origin and Target cell, and judge whether to produce pingpang handoff according to whether the switching scope of the switching scope of cell-of-origin and Target cell is overlapping, judge whether to produce ping-pong reselection according to whether the gravity treatment scope of the gravity treatment scope of cell-of-origin and Target cell is overlapping.If do not have overlappingly, parameter adjustment advisory information satisfies the demands, and parameter evaluation passes through; In the time not meeting above-mentioned condition, parameter adjustment advisory information does not satisfy the demands, and parameter evaluation does not pass through.

According to the different frequency priority plans of establishment, while not producing the principle of ping-pong reselection to parameter adjustment advisory information is satisfied, need satisfied condition to be described in detail below:

(1) in cell-of-origin, the frequency priority of the frequency that the frequency priority of the frequency that cell-of-origin is used is used higher than Target cell; In Target cell, the frequency priority of the frequency that the frequency priority of the frequency that Target cell is used is used higher than cell-of-origin;

Parameter adjustment advisory information meets while not producing the principle of ping-pong reselection, and the reselecting parameters in parameter adjustment advisory information need at least one of meet the following conditions:

1.r′ _t?arget-r′ _source≥d

$2.r_{t\arg \mathrm{et}}^{\&prime;}+r_{\mathrm{source}}^{\&prime;}\&le;d,\left\{\begin{array}{c}{\mathrm{TH}}_{\mathrm{source}}<{\mathrm{Thresh}}_{x,\mathrm{low}\left(\mathrm{sourceInt}\arg \mathrm{et}\right)}\\ r_{t\arg \mathrm{et}}+r_{\mathrm{source}}^{\&prime;}\&le;d\end{array}\right.$

$3.r_{t\arg \mathrm{et}}^{\&prime;}+r_{\mathrm{source}}^{\&prime;}>d>r_{t\arg \mathrm{et}}^{\&prime;}-r_{\mathrm{source}}^{\&prime;},\left\{\begin{array}{c}{r}_{t\arg \mathrm{et}}^{\&prime;}\&GreaterEqual;r_{\mathrm{source}}+d\\ {\mathrm{TH}}_{t\arg \mathrm{et}}<{\mathrm{Thresh}}_{x,\mathrm{low}\left(t\arg \mathrm{etInsource}\right)}\end{array}\right.$

(2) in cell-of-origin, the frequency priority of the frequency that the frequency priority of the frequency that cell-of-origin is used is used higher than Target cell; In Target cell, the frequency priority of the frequency that the frequency priority of the frequency that Target cell is used is used lower than cell-of-origin;

Parameter adjustment advisory information meets while not producing the principle of ping-pong reselection, and the reselecting parameters in parameter adjustment advisory information need at least one of meet the following conditions:

1.Thresh _{x，high(sourceIntarget)}≥TH _source

2.r′ _target+r′ _source＞d＞r′ _targ?et-r′ _source，r _t?arg?et+r′ _source≤d

(3) in cell-of-origin, the frequency priority of the frequency that the frequency priority of the frequency that cell-of-origin is used is used lower than Target cell; In Target cell, the frequency priority of the frequency that the frequency priority of the frequency that Target cell is used is used higher than cell-of-origin;

Parameter adjustment advisory information meets while not producing the principle of ping-pong reselection, and the reselecting parameters in parameter adjustment advisory information need at least one of meet the following conditions:

1.r′ _t?arg?et-r′ _source≥d

2.r′ _target+r′ _source＞d＞r′ _t?arg?et-r′ _source，TH _target＜Thresh _{x，high(targetInsource)}

(4) in cell-of-origin, the frequency priority of the frequency that the frequency priority of the frequency that cell-of-origin is used is used lower than Target cell; In Target cell, the frequency priority of the frequency that the frequency priority of the frequency that Target cell is used is used lower than cell-of-origin;

Parameter adjustment advisory information meets while not producing the principle of ping-pong reselection, and the reselecting parameters in parameter adjustment advisory information need to meet the following conditions:

r _target+r′ _source≤d

Wherein, r ' _sourcein Target cell, the covering radius of the frequency that cell-of-origin is used; R ' _{t arg et}in Target cell, the covering radius of the frequency that Target cell is used; D is the distance of source base station to target BS; TH _sourcethe gravity treatment thresholding of frequency using for cell-of-origin; TH _{t arg et}the gravity treatment thresholding of frequency using for Target cell; r _sourcein cell-of-origin, the covering radius of the frequency that cell-of-origin is used; r _{t arg et}in cell-of-origin, the covering radius of the frequency that Target cell is used; Thresh _{x, low (sourceInt arg et)}in Target cell, the thresholding of triggering cell gravity treatment; Thresh _{x, low (targetInsource)}in cell-of-origin, the thresholding of triggering cell gravity treatment.

Following YiLTE community and UTRAN community are example, and the judgment criterion that prevents ping-pong reselection is carried out to detailed, concrete description.In real network, can there is the overlapping scene in multiple communities, the situation of this scene simplification Wei Liangge community can be analyzed.

For ease of describing, can carry out the definition of following form:

TH _LTE＝min(S _{non?int?rasearch}，Thresh _{serving，low(LTE)}，Th _int?ra)

TH _Utran＝min(S _{prioritysearch}，Thresh _{serving，low(utran)}，Th _int?ra)

The propagation model of LTE base station is P ₁(dis)=Pathloss

The propagation model of UTRAN base station is P ₂(dis)=Pathloss

Wherein, TH _lTEfor the gravity treatment thresholding of LTE frequency; S _{nonint rasearch}for the thresholding of the measurement of the triggering different frequency/different system that stipulates in TS36.304 agreement, the signal strength signal intensity of current service cell during lower than this thresholding, triggers the measurement of different frequency/different system; Thresh _{serving, low (LTE)}in LTE system, the triggering thresholding of the cell reselection of low priority; Th _{int ra}for triggering the thresholding of selecting with frequently; TH _utranfor the gravity treatment thresholding of UTRAN frequency; S _{priorityse arch}for the thresholding of the measurement of the triggering different frequency/different system that stipulates in TS25.304 agreement, the signal strength signal intensity of current service cell during lower than this thresholding, triggers the measurement of different frequency/different system; Thresh _{serving, low (utran)}in UTRAN system, the triggering thresholding of the cell reselection of low priority; Dis is the distance of UE to base station, and Pathloss is the path loss of UE to base station.

In LTE community, the covering radius of LTE signal strength threshold Thresh is

the covering radius of UTRAN signal strength threshold Thresh2 is in UTRAN community, the covering radius of LTE signal strength threshold Thresh3 is

the covering radius of UTRAN signal strength threshold Thresh4 is

Wherein, the transmitting power of Tx_LTE WeiLTE community, Tx_Utran is the transmitting power of UTRAN community.

The region that in addition, can also define a closed gravity treatment coverage take radius as r is S _r, this extra-regional scope is

lTE base station is d to the distance of UTRAN base station.

The difference arranging according to HeLTE community, UTRAN community medium priority, can be divided into following several situation and describe the judgment criterion that prevents ping-pong reselection:

Situation 1:

In LTE community, the frequency priority of current LTE community is set higher than the frequency of adjacent UTRAN community; In UTRAN community, the frequency priority of current UTRAN community is set higher than the frequency of adjacent LTE community.

LTE cell reselection to the region of UTRAN community is:

$\left\{\begin{array}{c}{r}_{\mathrm{Utran}}-r_{\mathrm{Lte}}\&GreaterEqual;d,S=S_{r_{\mathrm{lte}}}\\ r_{\mathrm{Utran}}+r_{\mathrm{Lte}}\&le;d,S=S_{r_{\mathrm{utran}}}\\ \mathrm{else},S=S_{r_{\mathrm{utran}}}\&cap;\stackrel{\&OverBar;}{S_{r_{\mathrm{te}}}}\end{array}\right.$

The region of UTRAN cell reselection DaoLTE community is:

$\left\{\begin{array}{c}{r}_{\mathrm{Utran}}^{\&prime;}-r_{\mathrm{Lte}}^{\&prime;}\&GreaterEqual;d,S=\mathrm{\&Phi;}\\ r_{\mathrm{Utran}}^{\&prime;}+r_{\mathrm{Lte}}^{\&prime;}\&le;d,S=S_{r_{\mathrm{lte}}^{\&prime;}}\\ \mathrm{else},S=S_{r_{\mathrm{lte}}^{\&prime;}}\&cap;\stackrel{\&OverBar;}{S_{r_{\mathrm{utran}}^{\&prime;}}}\end{array}\right.$

For avoiding ping-pong reselection, above-mentioned two Overlapping Areas can not have overlapping, adjust parameter need at least one of meet the following conditions:

1.r′ _Utran-r′ _Lte≥d

$2.r_{\mathrm{Utran}}^{\&prime;}+r_{\mathrm{Lte}}^{\&prime;}\&le;d,\left\{\begin{array}{c}{\mathrm{TH}}_{\mathrm{LTE}}<{\mathrm{Thresh}}_{x,\mathrm{low}\left(\mathrm{LTEinUtran}\right)}\\ r_{\mathrm{Utran}}+r_{\mathrm{Lte}}^{\&prime;}\&le;d\end{array}\right.$

$3.r_{\mathrm{Utran}}^{\&prime;}+r_{\mathrm{LTE}}^{\&prime;}>d>r_{\mathrm{utran}}^{\&prime;}-r_{\mathrm{LTE}}^{\&prime;},\left\{\begin{array}{c}{r}_{\mathrm{Utran}}^{\&prime;}\&GreaterEqual;r_{\mathrm{Lte}}+d\\ {\mathrm{TH}}_{\mathrm{Utran}}<{\mathrm{Thresh}}_{x,\mathrm{low}\left(\mathrm{UtraninLTE}\right)}\end{array}\right.$

Situation 2:

In LTE community, the frequency priority of current LTE community is set higher than the frequency of adjacent UTRAN community; In UTRAN community, the frequency priority of LTE community is set higher than the frequency of current UTRAN community.

LTE cell reselection is identical with the content described in situation 1 to the region of UTRAN community, and the region of UTRAN cell reselection DaoLTE community is:

$S_{\mathrm{nonServing},x}\&le;{\mathrm{Thresh}}_{x,\mathrm{high}\left(\mathrm{LTEinUtran}\right)},S=S_{r_{\mathrm{lte}}^{\&prime;}}$

For avoiding the generation of ping-pong reselection phenomenon, above-mentioned two Overlapping Areas coverages can not have overlapping, adjust parameter need at least one of meet the following conditions:

1.Thresh _{x，high(LTEinUtran)}≥TH _LTE

2.r′ _Utran+r′ _LTE＞d＞r′ _utran-r′ _LTE，r _Utran+r′ _Lte≤d

Situation 3:

In LTE community, the frequency priority of UTRAN community is set higher than the frequency of current LTE community; In UTRAN community, the frequency priority of UTRAN community is set higher than the frequency of LTE community.

The region of UTRAN cell reselection DaoLTE community is identical with the content described in situation 1, and LTE cell reselection to the region of UTRAN community is:

$S_{\mathrm{nonServing},x}\&le;{\mathrm{Thresh}}_{x,\mathrm{high}\left(\mathrm{UtraninLTE}\right)},S=S_{r_{\mathrm{utran}}}$

For avoiding the generation of ping-pong reselection phenomenon, above-mentioned two Overlapping Areas coverages can not have overlapping, adjust parameter need at least one of meet the following conditions:

1.r′ _Utran-r′ _Lte≥d

2.r′ _Utran+r′ _LTE＞d＞r′ _utran-r′ _LTE，TH _Utran＜Thresh _{x，high(UtraninLTE)}

Situation 4:

In LTE community, the frequency priority of UTRAN community is set higher than the frequency of LTE community; In UTRAN community, the frequency priority of LTE community is set higher than the frequency of UTRAN community.

The region of UTRAN cell reselection DaoLTE community is:

$S_{\mathrm{nonServing},x}\&le;{\mathrm{Thresh}}_{x,\mathrm{high}\left(\mathrm{LTEinUtran}\right)},S=S_{r_{\mathrm{lte}}^{\&prime;}}$

LTE cell reselection is to the region of UTRAN community:

$S_{\mathrm{nonServing},x}\&le;{\mathrm{Thresh}}_{x,\mathrm{high}\left(\mathrm{UtraninLTE}\right)},S=S_{r_{\mathrm{utran}}}$

For avoiding the generation of ping-pong reselection phenomenon, above-mentioned two Overlapping Areas coverages can not have overlapping, adjust parameter need to meet the following conditions:

r _utran+r′ _LTE≤d

In addition, also can utilize local area that UE reports and the signal strength signal intensity of adjacent area to calculate relevant propagation model, the related content of its method in can grid of reference planning.

For simplicity, in the time that the frequency range of UTRAN base station and LTE base station and site height approach, can be similar to and think that the propagation model of two base stations is identical, and make Δ P=P ₁(d), represent the path loss between two base stations, this value can be obtained by the signal strength signal intensity of measuring adjacent area by the UE that is positioned at center of housing estate, also can estimate to obtain according to the distance of two communities or propagation model.

In the time that the propagation model of UTRAN base station and LTE base station is identical, the judgment criterion that prevents ping-pong reselection can be reduced to:

When situation 1, adjusting parameter need at least one of meet the following conditions:

1.Thresh _{x，low(LTEinUtran)}-TH _Utran≥ΔP+Tx_LTE-Tx_Utran

2.TH _utran+ Thresh _{x, low (LTEinUtran)}when≤Tx_Utran+Tx_LTE+ Δ P, need to meet one of following condition:

TH _LTE＜Thresh _{x，low(LTEinUtran)}

TH _Utran+Thresh _{x，low(UtraninLTE)}≤ΔP+Tx_LTE+Tx_Utran

3.Tx_Utran-TH _Utran+Tx_LTE-Thresh _{x，low(LTEinUtran)}＞ΔP

Δ P > Tx_Utran-TH _utran-Tx_LTE+Thresh _{x, low (LteInUtran)}time, need to meet one of following two conditions:

TH _Utran＜Thresh _{x，low(UtraninLTE)}

TH _LTE-TH _Utran≥ΔP+Tx_LTE-Tx_Utran

When situation 2, adjusting parameter need at least one of meet the following conditions:

1.Thresh _{x，high(LTEinUtran)}≥TH _LTE

2.Tx_Utran-TH _Utran+Tx_LTE-Thresh _{x，low(LTEinUtran)}＞ΔP

And, Δ P > Tx_Utran-TH _utran-Tx_LTE+Thresh _{x, low (LteInUtran)}

And, Tx_Utran+Tx_LTE-Δ P≤Thresh _{x, low (UtraninLTE)}+ Thresh _{x, high (LTEinUtran)}

When situation 3, adjusting parameter need at least one of meet the following conditions:

1.Tx_Utran-Tx_LTE≥ΔP+TH _Utran-Thresh _{x，low(LTEinUtran)}

2.Tx_Utran-TH _Utran+Tx_LTE-Thresh _{x，low(LTEinUtran)}＞ΔP

And, Δ P > Tx_Utran-TH _utran-Tx_LTE+Thresh _{x, low (LteInUtran)}

And, TH _utran< Thresh _{x, high (UtraninLTE)}

When situation 4, adjusting parameter need to meet the following conditions:

Tx_Utran+Tx_LTE-ΔP≥TH _Utran+Thresh _{x，high(LTEinUtran)}

Can find out by above description, the information on load providing for source base station due to the target BS of load balancing can reflect target BS load condition around better, make source base station indirectly obtain more cell information, and the appearance of minimizing concussion adjustment, revise less to existing protocol process simultaneously, the equipment realization of equipment manufacturers and the enforcement of operator are facilitated, in addition, method in the embodiment of the present invention is not only applicable in the load balancing Automatic Optimal of SON scope, also go in LTE and follow-up evolvement network (as LTE+) thereof during traditional load balancing manually optimizes, can be used as a kind of scheme implementation of simple and easy to do load balancing parameter coordination.

Respectively with under the common covering scene shown in the focus covering scene shown in Fig. 2, Fig. 4 and the adjacent scene shown in Fig. 6, the specific implementation process of the embodiment of the present invention is that example describes below.

As shown in Figure 2, be the focus covering scene schematic diagram in the embodiment of the present invention, wherein, LTE community covers less region, and TD-SCDMA community covers larger region.The frequency range that LTE community and TD-SCDMA community adopt is all 2G frequency range, and the ground level of standing approaches, therefore, be similar to and think that LTE community is identical with the propagation model of TD-SCDMA community, in QieLTE community and TD-SCDMA community, the priority of current frequency is set respectively higher than the priority of other RAT.

As shown in Figure 3, be the method for adjustment flow chart of the mobility parameters in focus covering scene, comprise the following steps:

Step 301, the information on load of periodic statistics Qi Xia community, LTE base station, knows that the load of self is too high, triggers the exchange of information on load and parameter configuration, by the mutual information on load of RIM process and TD-SCDMA base station and parameter configuration.

Step 302, LTE base station knows that according to interactive information the coverage of self is in the coverage of TD-SCDMA, determines to reduce handoff parameter Thresh1 and the reselecting parameters Thresh of this community _{serving, low}.

Particularly, because the frequency priority when the first two community is all that the frequency of current service frequency higher than other technologies is set, therefore, judge and belong to situation 1, obtain following information by the reselecting parameters relation between Liang Ge community:

LTE cell reselection to the region of TD-SCDMA community is:

the region of TD-SCDMA cell reselection DaoLTE community does not exist, and is sky.

Equally, the trigger event that LTE community is switched to TD-SCDMA cell configuration is B2 event, and the region that is switched to TD-SCDMA community is consistent with gravity treatment scope:

tD-SCDMA community is because the region that the reason of signal strength signal intensity is switched to LTE community is sky.

From with co-relation, LTE base station determines to reduce handoff parameter Thresh1 and the reselecting parameters Thre of this community _{shserving, low}, its adjusting range can be determined by the implementation algorithm of the step-length of OAM system configuration or MLB.

Step 303, LTE base station utilizes RIM message on S1 interface, and the parameter of needs adjustment is sent to TD-SCDMA base station with the form of parameter recommendation information.

Wherein, the content that RIM message is carried comprises: the reselecting parameters Thresh of the variable quantity HeLTE community of the handoff parameter Thresh1 of LTE community _{serving, low}variable quantity.

Step 304, TD-SCDMA base station is assessed parameter recommendation information, knows that parameter meets respectively the criterion that does not produce pingpang handoff, ping-pong reselection, accepts the parameter recommendation information of LTE base station.

Step 305, Iu interface is passed through to LTE base station feedback confirmation in TD-SCDMA base station.

Wherein, in confirmation, can comprise the initial time that parameter can be upgraded.

Step 306, LTE base station utilizes S1 interface to send parameter update notification to TD-SCDMA base station.

Wherein, in parameter update notification, comprise LTE community and TD-SCDMA community and start simultaneously the time T of undated parameter.

Step 307, in the time of time T, relevant parameter is upgraded in LTE community and TD-SCDMA community simultaneously.

In the embodiment of the present invention, carry out the mobility parameters of two different system cell intercorrelations of parameter adjustment, realize parameter negotiation and parameter evaluation in load balancing, and carry out parameter adjustment in conjunction with the information on load of two different system cells, current mobility parameters, with the distribution situation of change of load, reduce because parameter is not mated the mobility problem such as ping-pong reselection, pingpang handoff of initiation, improve the success rate of parameter negotiation and the convergence of load balancing, and guarantee user's QoS.

As shown in Figure 4, be the common covering scene schematic diagram in the embodiment of the present invention, wherein, and A ShiLTE community, community, community B is TD-SCDMA community.TD-SCDMA base station and LTE base station are deployed on a site jointly, and overlay area is a small-sized square, and covering radius is 500 meters.In LTE and TD-SCDMA community, the priority of current frequency is set respectively higher than the priority of other RAT.

As shown in Figure 5, be the method for adjustment flow chart of the mobility parameters in common covering scene, comprise the following steps:

Step 501, the information on load of periodic statistics Qi Xia community, LTE base station, knows that the load of self is too high, triggers the exchange of information on load and parameter configuration, by the mutual information on load of RIM process and TD-SCDMA base station and parameter configuration.

Step 502, LTE base station is known with TD-SCDMA base station and is belonged to common covering scene according to interactive information, and determines and adjust parameter.

Particularly, because the frequency priority when the first two community is all that the frequency of current service frequency higher than other technologies is set, therefore, judge and belong to situation 1, can obtain following information by the gravity treatment between Liang Ge community, handoff parameter relation:

Switching between Liang Ge community and gravity treatment scope do not exist, under parameter current configuring condition, connected state UE and Idle state UE can not independently switch or gravity treatment Dao Gongzhi community in.

User's redistribution, according to moving load equalization algorithm, is carried out by adjusting gravity treatment carrier wave priority and relevant parameter in LTE base station.For connected state user, user's transfer is carried out in the switching of LTE base station Adoption Network side.In LTE, improve the carrier wave priority of TD-SCDMA, the frequency that its priority is used higher than LTE.Because variation has occurred frequency priority, need to recalculate reselecting parameters Thresh _{x, high (UtraninLTE)}, its computational methods are that the load of current LTE community is S, expect that the load shifting is Δ S, target coverage radius is r _n, and approximate think that user belongs to and be uniformly distributed, initial parametric distribution can be according to following computing formula:

carry out.

Step 503, LTE base station utilizes RIM message on S1 interface, and the parameter of needs adjustment is sent to TD-SCDMA base station with the form of parameter recommendation information.

Wherein, the content that RIM message is carried comprises: the reselecting parameters Thresh upgrading in the new gravity treatment frequency priority lists HeLTE community of LTE community _{x, high (UtraninLTE)}.

Step 504, TD-SCDMA base station is assessed parameter recommendation information, knows that parameter meets respectively the criterion that does not produce pingpang handoff, ping-pong reselection, accepts the parameter recommendation information of LTE base station.

Step 505, Iu interface is passed through to LTE base station feedback confirmation in TD-SCDMA base station.

Wherein, in confirmation, can comprise the initial time that parameter can be upgraded.

Step 506, LTE base station utilizes S1 interface to send parameter update notification to TD-SCDMA base station.

Wherein, in parameter update notification, comprise LTE community and TD-SCDMA community and start simultaneously the time T of undated parameter.

Step 507, in the time of time T, relevant parameter is upgraded in LTE community and TD-SCDMA community simultaneously.

In the embodiment of the present invention, carry out the mobility parameters of two different system cell intercorrelations of parameter adjustment, realize parameter negotiation and parameter evaluation in load balancing, and carry out parameter adjustment in conjunction with the information on load of two different system cells, current mobility parameters, with the distribution situation of change of load, reduce because parameter is not mated the mobility problem such as ping-pong reselection, pingpang handoff of initiation, improve the success rate of parameter negotiation and the convergence of load balancing, and guarantee user's QoS.

As shown in Figure 6, be the adjacent scene schematic diagram in the embodiment of the present invention, the surrounding of LTE community has three TD-SCDMA base stations, and three TD-SCDMA base stations adopt respectively N frequency technology, and dominant frequency point is not identical.

As shown in Figure 7, be the method for adjustment flow chart of the mobility parameters in adjacent scene, comprise the following steps:

Step 701, the information on load of periodic statistics Qi Xia community, LTE base station, knows that the load of self is too high, triggers the exchange of information on load and parameter configuration, by the mutual information on load of RIM process and TD-SCDMA base station and parameter configuration.

Particularly, LTE eNodebB1 community configures relevant informations by RIM process to TD NodeB1,2,3 communities difference required parameters.

Step 702, LTE base station is known with TD-SCDMA base station and is belonged to adjacent covering scene according to interactive information, and determines and adjust parameter.

Particularly, because the frequency priority when the first two community is all that the frequency of current service frequency higher than other technologies is set, therefore judge and belong to situation 1, can obtain following information by the gravity treatment between Liang Ge community, handoff parameter relation:

LTE gravity treatment is empty to the region of TD-SCDMA, and UE can not trigger the gravity treatment of LTE to TD-SCDMA because of the problem of signal strength signal intensity; The trigger event that LTE is switched to TD-SCDMA configuration is B2 event, and it is Zone switched is empty.

Now, the reselecting parameters Thresh that LTE base station determines to improve the frequency priority of three TD-SCDMA communities and revises each frequency _{serving, high}, to change the resident distribution of UE, user's transfer is carried out in the switching triggering for existing connected state Adoption Network side.

Step 703, LTE base station utilizes RIM message on S1 interface, and the parameter of needs adjustment is sent to TD NodeB1,2,3 with the form of parameter recommendation information.

Wherein, the content that RIM message is carried comprises: the reselecting parameters Thresh upgrading in the new gravity treatment frequency priority lists HeLTE community of LTE community _{x, high (UtraninLTE)}.

Step 704, TD-SCDMA base station is assessed parameter recommendation information, knows that parameter meets respectively the criterion that does not produce pingpang handoff, ping-pong reselection, accepts the parameter recommendation information of LTE base station.

Step 705, Iu interface is passed through to LTE base station feedback confirmation in TD-SCDMA base station.

Wherein, in confirmation, can comprise the initial time that parameter can be upgraded.

Step 706, LTE base station receives after the acknowledge message of three TD-SCDMA base stations, utilizes S1 interface to send respectively a parameter update notification to three TD-SCDMA base stations.

Wherein, in parameter update notification, can comprise LTE community and TD-SCDMA community and start simultaneously the time T of undated parameter.

Step 707, in the time of time T, relevant parameter is upgraded in LTE community and three TD-SCDMA communities simultaneously.

In the embodiment of the present invention, carry out the mobility parameters of two different system cell intercorrelations of parameter adjustment, realize parameter negotiation and parameter evaluation in load balancing, and carry out parameter adjustment in conjunction with the information on load of two different system cells, current mobility parameters, with the distribution situation of change of load, reduce because parameter is not mated the mobility problem such as ping-pong reselection, pingpang handoff of initiation, improve the success rate of parameter negotiation and the convergence of load balancing, and guarantee user's QoS.

As shown in Figure 8, be the source base station structural representation in the embodiment of the present invention, comprising:

The first evaluation module 810, for carrying out parameter evaluation according to the mobility parameters of target BS and configuration parameter, obtains parameter adjustment advisory information.

Particularly, the first evaluation module 810, for judge the covering scene of source base station and target BS according to mobility parameters and configuration parameter, select need the mobility parameters of adjusting and obtain the mobility parameters after adjustment according to this covering scene, obtain comprising the parameter adjustment advisory information of the mobility parameters after this adjustment.

The first transceiver module 820, for sending parameter adjustment advisory information to target BS, when after the confirmation receiving from target BS, sends parameter update notification to target BS.

The first adjusting module 830, for carrying out the adjustment of mobility parameters.

Particularly, the first adjusting module 830, the parameter updated time of carrying for the parameter update notification sending according to the first transceiver module 820 is carried out the adjustment of mobility parameters.

Above-mentioned the first transceiver module 820, also, in the time that target BS does not pass through the assessment of parameter adjustment advisory information, receives the refuse information from target BS; The parameter adjustment scheme evaluation carrying in to exclude information when the first evaluation module 810 by time, send the parameter adjustment advisory information of carrying parameter adjustment scheme to target BS; Correspondingly, the first evaluation module 810, also carries out parameter evaluation for the parameter adjustment scheme that exclude information is carried.

Particularly, the first evaluation module 810 judges whether parameter adjustment scheme meets the principle that does not produce pingpang handoff and ping-pong reselection, if met, parameter adjustment scheme evaluation passes through; Otherwise parameter adjustment scheme evaluation does not pass through.The first evaluation module 810 is according to handoff parameter and reselecting parameters in the covering scene of source base station and target BS and parameter adjustment scheme, obtain switching scope and the gravity treatment scope of cell-of-origin and Target cell, and judge whether to produce pingpang handoff according to whether the switching scope of the switching scope of cell-of-origin and Target cell is overlapping, judge whether to produce ping-pong reselection according to whether the gravity treatment scope of the gravity treatment scope of cell-of-origin and Target cell is overlapping.

In the embodiment of the present invention, carry out the mobility parameters of two different system cell intercorrelations of parameter adjustment, realize parameter negotiation and parameter evaluation in load balancing, and carry out parameter adjustment in conjunction with the information on load of two different system cells, current mobility parameters, with the distribution situation of change of load, reduce because parameter is not mated the mobility problem such as ping-pong reselection, pingpang handoff of initiation, improve the success rate of parameter negotiation and the convergence of load balancing, and guarantee user's QoS.

As shown in Figure 9, be the target BS structural representation in the embodiment of the present invention, comprising:

The second transceiver module 910, for receiving the parameter adjustment advisory information from source base station, when assessment is passed through to parameter adjustment advisory information at the second evaluation module 920, sends confirmation to source base station, and receives the parameter update notification from source base station.

The second evaluation module 920, carries out parameter evaluation for the parameter adjustment advisory information that the second transceiver module 910 is received.

Particularly, above-mentioned the second evaluation module 920, for judging whether parameter adjustment advisory information meets the principle that does not produce pingpang handoff and ping-pong reselection, if met, the assessment of parameter adjustment advisory information is passed through; Otherwise the assessment of parameter adjustment advisory information is not passed through.The second evaluation module 920 is according to handoff parameter and reselecting parameters in the covering scene of source base station and target BS and parameter adjustment advisory information, obtain switching scope and the gravity treatment scope of cell-of-origin and Target cell, and judge whether to produce pingpang handoff according to whether the switching scope of the switching scope of cell-of-origin and Target cell is overlapping, judge whether to produce ping-pong reselection according to whether the gravity treatment scope of the gravity treatment scope of cell-of-origin and described Target cell is overlapping.

The second adjusting module 930, for carrying out the adjustment of mobility parameters.

Particularly, the second adjusting module 930, the parameter updated time of carrying for the parameter update notification receiving according to the second transceiver module 910 is carried out the adjustment of mobility parameters.

Above-mentioned the second transceiver module 910, also, in the time that the second evaluation module 920 does not pass through the assessment of parameter adjustment advisory information, sends refuse information to source base station, carries parameter adjustment scheme in this refuse information; In the time that source base station passes through parameter adjustment scheme evaluation, receive the parameter adjustment advisory information from the parameter adjustment scheme of carrying of source base station.

In the embodiment of the present invention, carry out the mobility parameters of two different system cell intercorrelations of parameter adjustment, realize parameter negotiation and parameter evaluation in load balancing, and carry out parameter adjustment in conjunction with the information on load of two different system cells, current mobility parameters, with the distribution situation of change of load, reduce because parameter is not mated the mobility problem such as ping-pong reselection, pingpang handoff of initiation, improve the success rate of parameter negotiation and the convergence of load balancing, and guarantee user's QoS.

Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential general hardware platform by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions (can be mobile phones in order to make a station terminal equipment, personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.

It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be integrated in one, and also can separate deployment, can merge into a module, also can further split into multiple submodules.

The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.

Disclosed is above only several specific embodiment of the present invention, and still, the present invention is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.

Claims (21)

1. a method of adjustment for mobility parameters, is characterized in that, comprises the following steps:

Source base station carries out parameter evaluation according to the mobility parameters of target BS and configuration parameter, obtains parameter adjustment advisory information, and described parameter adjustment advisory information is sent to described target BS;

Described source base station receives after the confirmation from described target BS, sends parameter update notification, and carry out the adjustment of mobility parameters to described target BS;

Wherein, described source base station also comprises: described source base station receives the refuse information that described target BS returns after described parameter adjustment advisory information is sent to described target BS; Described source base station is assessed the parameter adjustment scheme of carrying in described exclude information, in the time that described parameter adjustment scheme evaluation passes through, sends the parameter adjustment advisory information of carrying described parameter adjustment scheme to described target BS; Described source base station receives after the confirmation from described target BS, sends parameter update notification, and carry out the configuration of mobility parameters to described target BS;

Wherein, described source base station is assessed the parameter adjustment scheme of carrying in described exclude information, comprising:

Described source base station judges whether described parameter adjustment scheme meets the principle that does not produce pingpang handoff and ping-pong reselection, if met, described parameter adjustment scheme evaluation passes through; Otherwise described parameter adjustment scheme evaluation does not pass through;

Wherein, described source base station judges that whether described parameter adjustment scheme meets the principle that does not produce pingpang handoff and ping-pong reselection, comprising:

Described source base station is according to handoff parameter and reselecting parameters in the covering scene of described source base station and described target BS and described parameter adjustment scheme, obtain switching scope and the gravity treatment scope of cell-of-origin and Target cell, and judge whether to produce pingpang handoff according to whether the switching scope of the switching scope of described cell-of-origin and described Target cell is overlapping, judge whether to produce ping-pong reselection according to whether the gravity treatment scope of the gravity treatment scope of described cell-of-origin and described Target cell is overlapping.

2. the method for claim 1, is characterized in that, described source base station carries out parameter evaluation, obtains parameter adjustment advisory information, comprising:

Described source base station is determined the covering scene of described source base station and described target BS according to described mobility parameters and configuration parameter, select need the mobility parameters of adjusting and obtain the mobility parameters after adjustment according to described covering scene, obtain comprising the parameter adjustment advisory information of the mobility parameters after described adjustment.

3. the method for claim 1, is characterized in that, in described cell-of-origin, and the frequency priority of the frequency that the frequency priority of the frequency that described cell-of-origin is used is used higher than described Target cell; In described Target cell, the frequency priority of the frequency that the frequency priority of the frequency that described Target cell is used is used higher than described cell-of-origin;

Described parameter adjustment scheme meets while not producing the principle of ping-pong reselection, and the reselecting parameters in described parameter adjustment scheme need to one of meet the following conditions:

1.r′ _target-r′ _source≥d

2. $r_{t\arg \mathrm{et}}^{\&prime;}+r_{\mathrm{source}}^{\&prime;}\&le;d,\left\{\begin{array}{c}{\mathrm{TH}}_{\mathrm{source}}<{\mathrm{Thresh}}_{x,\mathrm{low}\left(\mathrm{sourceInt}\arg \mathrm{et}\right)}\\ r_{t\arg \mathrm{et}}+r_{\mathrm{source}}^{\&prime;}\&le;d\end{array}\right.$

3. $r_{t\arg \mathrm{et}}^{\&prime;}+r_{\mathrm{source}}^{\&prime;}>d>r_{t\arg \mathrm{et}}^{\&prime;}-r_{\mathrm{source}}^{\&prime;},\left\{\begin{array}{c}{r}_{t\arg \mathrm{et}}^{\&prime;}\&GreaterEqual;r_{\mathrm{source}}+d\\ {\mathrm{TH}}_{t\arg \mathrm{et}}<{\mathrm{Thresh}}_{x,\mathrm{low}\left(t\arg \mathrm{etInsource}\right)}\end{array}\right.$

Wherein, r ' _sourcein described Target cell, the covering radius of the frequency that described cell-of-origin is used; R ' _targetin described Target cell, the covering radius of the frequency that described Target cell is used; D is the distance of described source base station to described target BS; TH _sourcethe gravity treatment thresholding of the frequency using for described cell-of-origin; TH _targetthe gravity treatment thresholding of the frequency using for described Target cell; r _sourcein described cell-of-origin, the covering radius of the frequency that described cell-of-origin is used; r _targetin described cell-of-origin, the covering radius of the frequency that described Target cell is used; Thresh _{x, low (sourceIntarget)}in described Target cell, the thresholding of triggering cell gravity treatment; Thresh _{x, low (targetInsource)}in described cell-of-origin, the thresholding of triggering cell gravity treatment.

4. the method for claim 1, is characterized in that, in described cell-of-origin, and the frequency priority of the frequency that the frequency priority of the frequency that described cell-of-origin is used is used higher than described Target cell; In described Target cell, the frequency priority of the frequency that the frequency priority of the frequency that described Target cell is used is used lower than described cell-of-origin;

Described parameter adjustment scheme meets while not producing the principle of ping-pong reselection, and the reselecting parameters in described parameter adjustment scheme need at least one of meet the following conditions:

1.Thresh _{x,high(sourceIntarget)}≥TH _source

2.r′ _target+r′ _source＞d＞r′ _target-r′ _source,r _target+r′ _source≤d

Wherein, r ' _sourcein described Target cell, the covering radius of the frequency that described cell-of-origin is used; R ' _targetin described Target cell, the covering radius of the frequency that described Target cell is used; D is the distance of described source base station to described target BS; TH _sourcethe gravity treatment thresholding of the frequency using for described cell-of-origin; r _targetin described cell-of-origin, the covering radius of the frequency that described Target cell is used; Thresh _{x, high (sourceIntarget)}in described Target cell, the thresholding of triggering cell gravity treatment.

5. the method for claim 1, is characterized in that, in described cell-of-origin, and the frequency priority of the frequency that the frequency priority of the frequency that described cell-of-origin is used is used lower than described Target cell; In described Target cell, the frequency priority of the frequency that the frequency priority of the frequency that described Target cell is used is used higher than described cell-of-origin;

Described parameter adjustment scheme meets while not producing the principle of ping-pong reselection, and the reselecting parameters in described parameter adjustment scheme need to one of meet the following conditions:

1.r′ _target-r′ _source≥d

2.r′ _target+r′ _source＞d＞r′ _target-r′ _source,TH _target＜Thresh _{x,high(targetInsource)}

Wherein, r ' _sourcein described Target cell, the covering radius of the frequency that described cell-of-origin is used; R ' _targetin described Target cell, the covering radius of the frequency that described Target cell is used; D is the distance of described source base station to described target BS; TH _targetthe gravity treatment thresholding of the frequency using for described Target cell; Thresh _{x, high (targetInsource)}in described cell-of-origin, the thresholding of triggering cell gravity treatment.

6. the method for claim 1, is characterized in that, in described cell-of-origin, and the frequency priority of the frequency that the frequency priority of the frequency that described cell-of-origin is used is used lower than described Target cell; In described Target cell, the frequency priority of the frequency that the frequency priority of the frequency that described Target cell is used is used lower than described cell-of-origin;

Described parameter adjustment scheme meets while not producing the principle of ping-pong reselection, and the reselecting parameters in described parameter adjustment scheme need to meet the following conditions:

r _target+r′ _source≤d

Wherein, r _targetin described cell-of-origin, the covering radius of the frequency that described Target cell is used; R ' _sourcein described Target cell, the covering radius of the frequency that described cell-of-origin is used; D is the distance of described source base station to described target BS.

7. the method for claim 1, is characterized in that, described source base station carries out the adjustment of mobility parameters according to the parameter updated time of carrying in described parameter update notification.

8. a method of adjustment for mobility parameters, is characterized in that, comprises the following steps:

Target BS receives the parameter adjustment advisory information from source base station, and described parameter adjustment advisory information is carried out to parameter evaluation;

In the time that described parameter adjustment advisory information assessment is passed through, described target BS sends confirmation to described source base station;

Described target BS receives the parameter update notification from described source base station, and carries out the adjustment of mobility parameters;

Wherein, described target BS carries out parameter evaluation to described parameter adjustment advisory information, comprising:

Described target BS judges whether described parameter adjustment advisory information meets the principle that does not produce pingpang handoff and ping-pong reselection, if met, described parameter adjustment advisory information assessment is passed through; Otherwise described parameter adjustment advisory information assessment is not passed through;

Wherein, described target BS judges that whether described parameter adjustment scheme meets the principle that does not produce pingpang handoff and ping-pong reselection, comprising:

Described target BS is according to handoff parameter and reselecting parameters in the covering scene of described source base station and described target BS and parameter adjustment advisory information, obtain switching scope and the gravity treatment scope of cell-of-origin and Target cell, and judge whether to produce pingpang handoff according to whether the switching scope of the switching scope of described cell-of-origin and described Target cell is overlapping, judge whether to produce ping-pong reselection according to whether the gravity treatment scope of the gravity treatment scope of described cell-of-origin and described Target cell is overlapping.

9. method as claimed in claim 8, is characterized in that, described target BS also comprises after described parameter adjustment advisory information is carried out to parameter evaluation:

In the time that described parameter adjustment advisory information assessment is not passed through, described target BS sends refuse information to described source base station, carries parameter adjustment scheme in described refuse information;

In the time that described source base station passes through described parameter adjustment scheme evaluation, described target BS receives the parameter adjustment advisory information from the described parameter adjustment scheme of carrying of described source base station;

Described target BS carries out parameter evaluation to described parameter adjustment advisory information;

In the time that described parameter adjustment advisory information assessment is passed through, described target BS sends confirmation to described source base station;

Described target BS receives the parameter update notification from described source base station, and carries out the adjustment of mobility parameters.

10. method as claimed in claim 8, is characterized in that, in described cell-of-origin, and the frequency priority of the frequency that the frequency priority of the frequency that described cell-of-origin is used is used higher than described Target cell; In described Target cell, the frequency priority of the frequency that the frequency priority of the frequency that described Target cell is used is used higher than described cell-of-origin;

Described parameter adjustment advisory information meets while not producing the principle of ping-pong reselection, and the reselecting parameters in described parameter adjustment advisory information need to one of meet the following conditions:

1.r′ _target-r′ _source≥d

2. $r_{t\arg \mathrm{et}}^{\&prime;}+r_{\mathrm{source}}^{\&prime;}\&le;d,\left\{\begin{array}{c}{\mathrm{TH}}_{\mathrm{source}}<{\mathrm{Thresh}}_{x,\mathrm{low}\left(\mathrm{sourceInt}\arg \mathrm{et}\right)}\\ r_{t\arg \mathrm{et}}+r_{\mathrm{source}}^{\&prime;}\&le;d\end{array}\right.$

3. $r_{t\arg \mathrm{et}}^{\&prime;}+r_{\mathrm{source}}^{\&prime;}>d>r_{t\arg \mathrm{et}}^{\&prime;}-r_{\mathrm{source}}^{\&prime;},\left\{\begin{array}{c}{r}_{t\arg \mathrm{et}}^{\&prime;}\&GreaterEqual;r_{\mathrm{source}}+d\\ {\mathrm{TH}}_{t\arg \mathrm{et}}<{\mathrm{Thresh}}_{x,\mathrm{low}\left(t\arg \mathrm{etInsource}\right)}\end{array}\right.$

Wherein, r ' _sourcein described Target cell, the covering radius of the frequency that described cell-of-origin is used; R ' _targetin described Target cell, the covering radius of the frequency that described Target cell is used; D is the distance of described source base station to described target BS; TH _sourcethe gravity treatment thresholding of the frequency using for described cell-of-origin; TH _targetthe gravity treatment thresholding of the frequency using for described Target cell; r _sourcein described cell-of-origin, the covering radius of the frequency that described cell-of-origin is used; r _targetin described cell-of-origin, the covering radius of the frequency that described Target cell is used; Thresh _{x, low (sourceIntarget)}in described Target cell, the thresholding of triggering cell gravity treatment; Thresh _{x, low (targetInsource)}in described cell-of-origin, the thresholding of triggering cell gravity treatment.

11. methods as claimed in claim 8, is characterized in that, in described cell-of-origin, and the frequency priority of the frequency that the frequency priority of the frequency that described cell-of-origin is used is used higher than described Target cell; In described Target cell, the frequency priority of the frequency that the frequency priority of the frequency that described Target cell is used is used lower than described cell-of-origin;

Described parameter adjustment advisory information meets while not producing the principle of ping-pong reselection, and the reselecting parameters in described parameter adjustment advisory information need at least one of meet the following conditions:

1.Thresh _{x,high(sourceIntarget)}≥TH _source

2.r′ _target+r′ _source＞d＞r′ _target-r′ _source,r _target+r′ _source≤d

Wherein, r ' _sourcein described Target cell, the covering radius of the frequency that described cell-of-origin is used; R ' _targetin described Target cell, the covering radius of the frequency that described Target cell is used; D is the distance of described source base station to described target BS; TH _sourcethe gravity treatment thresholding of the frequency using for described cell-of-origin; r _targetin described cell-of-origin, the covering radius of the frequency that described Target cell is used; Thresh _{x, high (sourceIntarget)}in described Target cell, the thresholding of triggering cell gravity treatment.

12. methods as claimed in claim 8, is characterized in that, in described cell-of-origin, and the frequency priority of the frequency that the frequency priority of the frequency that described cell-of-origin is used is used lower than described Target cell; In described Target cell, the frequency priority of the frequency that the frequency priority of the frequency that described Target cell is used is used higher than described cell-of-origin;

Described parameter adjustment advisory information meets while not producing the principle of ping-pong reselection, and the reselecting parameters in described parameter adjustment advisory information need to one of meet the following conditions:

1.r′ _target-r′ _source≥d

2.r′ _target+r′ _source＞d＞r′ _target-r′ _source,TH _target＜Thresh _{x,high(targetInsource)}

Wherein, r ' _sourcein described Target cell, the covering radius of the frequency that described cell-of-origin is used; R ' _targetin described Target cell, the covering radius of the frequency that described Target cell is used; D is the distance of described source base station to described target BS; TH _targetthe gravity treatment thresholding of the frequency using for described Target cell; Thresh _{x, high (targetInsource)}in described cell-of-origin, the thresholding of triggering cell gravity treatment.

13. methods as claimed in claim 8, is characterized in that, in described cell-of-origin, and the frequency priority of the frequency that the frequency priority of the frequency that described cell-of-origin is used is used lower than described Target cell; In described Target cell, the frequency priority of the frequency that the frequency priority of the frequency that described Target cell is used is used lower than described cell-of-origin;

Described parameter adjustment advisory information meets while not producing the principle of ping-pong reselection, and the reselecting parameters in described parameter adjustment advisory information need to meet the following conditions:

r _target+r′ _source≤d

Wherein, r _targetin described cell-of-origin, the covering radius of the frequency that described Target cell is used; R ' _sourcein described Target cell, the covering radius of the frequency that described cell-of-origin is used; D is the distance of described source base station to described target BS.

14. methods as claimed in claim 8, is characterized in that, described target BS carries out the adjustment of mobility parameters according to the parameter updated time of carrying in described parameter update notification.

15. 1 kinds of source base stations, is characterized in that, comprising:

The first evaluation module, for carrying out parameter evaluation according to the mobility parameters of target BS and configuration parameter, obtains parameter adjustment advisory information;

The first transceiver module, for send the parameter adjustment advisory information that described the first evaluation module obtains to described target BS, when after the confirmation receiving from described target BS, sends parameter update notification to described target BS;

The first adjusting module, for carrying out the adjustment of mobility parameters;

Wherein, described the first evaluation module, for judging whether described parameter adjustment scheme meets the principle that does not produce pingpang handoff and ping-pong reselection, if met, described parameter adjustment scheme evaluation passes through; Otherwise described parameter adjustment scheme evaluation does not pass through;

Wherein, described the first evaluation module, be used for according to handoff parameter and the reselecting parameters of the covering scene of described source base station and described target BS and described parameter adjustment scheme, obtain switching scope and the gravity treatment scope of cell-of-origin and Target cell, and judge whether to produce pingpang handoff according to whether the switching scope of the switching scope of described cell-of-origin and described Target cell is overlapping, judge whether to produce ping-pong reselection according to whether the gravity treatment scope of the gravity treatment scope of described cell-of-origin and described Target cell is overlapping.

16. source base stations as claimed in claim 15, is characterized in that,

Described the first evaluation module, for judge the covering scene of described source base station and described target BS according to described mobility parameters and configuration parameter, select need the mobility parameters of adjusting and obtain the mobility parameters after adjustment according to described covering scene, obtain comprising the parameter adjustment advisory information of the mobility parameters after described adjustment.

17. source base stations as claimed in claim 15, is characterized in that,

Described the first transceiver module, also, in the time that described target BS does not pass through described parameter adjustment advisory information assessment, receives the refuse information from described target BS; The parameter adjustment scheme evaluation carrying in to described exclude information when described the first evaluation module by time, send the parameter adjustment advisory information of carrying described parameter adjustment scheme to described target BS;

Described the first evaluation module, also carries out parameter evaluation for the parameter adjustment scheme that described exclude information is carried.

18. source base stations as claimed in claim 15, is characterized in that,

Described the first adjusting module, the parameter updated time of carrying for the parameter update notification sending according to described the first transceiver module is carried out the adjustment of mobility parameters.

19. 1 kinds of target BS, is characterized in that, comprising:

The second transceiver module, for receiving the parameter adjustment advisory information from source base station, in the time that the second evaluation module passes through described parameter adjustment advisory information assessment, sends confirmation to described source base station, and receives the parameter update notification from described source base station;

The second evaluation module, carries out parameter evaluation for the parameter adjustment advisory information that described the second transceiver module is received;

The second adjusting module, for carrying out the adjustment of mobility parameters;

Wherein, described the second evaluation module specifically for, judge that whether described parameter adjustment advisory information meets the principle that does not produce pingpang handoff and ping-pong reselection, if met, described parameter adjustment advisory information assessment is passed through; Otherwise described parameter adjustment advisory information assessment is not passed through;

Wherein, described the second evaluation module, be used for according to handoff parameter and the reselecting parameters of the covering scene of described source base station and described target BS and parameter adjustment advisory information, obtain switching scope and the gravity treatment scope of cell-of-origin and Target cell, and judge whether to produce pingpang handoff according to whether the switching scope of the switching scope of described cell-of-origin and described Target cell is overlapping, judge whether to produce ping-pong reselection according to whether the gravity treatment scope of the gravity treatment scope of described cell-of-origin and described Target cell is overlapping.

20. target BS as claimed in claim 19, is characterized in that,

Described the second transceiver module, also, in the time that described the second evaluation module does not pass through described parameter adjustment advisory information assessment, sends refuse information to described source base station, carries parameter adjustment scheme in described refuse information; In the time that described source base station passes through described parameter adjustment scheme evaluation, receive the parameter adjustment advisory information from the described parameter adjustment scheme of carrying of described source base station.

21. target BS as claimed in claim 19, is characterized in that,

Described the second adjusting module, the parameter updated time of carrying for the parameter update notification receiving according to described the second transceiver module is carried out the adjustment of mobility parameters.

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