CN102378298B - CDMA (Code Division Multiple Access) soft switching method, base station and system - Google Patents

Abstract

The invention relates to a CDMA (Code Division Multiple Access) soft switching method which comprises the steps of: setting a load adjustment parameter in a system parameter message in a paging channel of a cell where a mobile station resides based on a base station load condition in a network operation process; adjusting an originally set base station switching threshold based on the load adjustment parameter to obtain a new base station switching threshold; when the mobile station in an idle state monitors the system parameter message of the paging channel periodically, switching the new base station switching threshold to the mobile station by the base station; and performing corresponding switching operation by the mobile station according to a result obtained by comparing the detected pilot frequency intensity with the new base station switching threshold. The invention also relates to a CDMA base station and a soft switching system. According to the invention, a load adjustment parameter is introduced at the base station side, and a fixed switching parameter can be adjusted according to the practical network load condition in the network operation process by setting different values of the load adjustment parameters, so that network telephone traffic can be balanced reasonably and call completing rate is improved.

Description

A kind of code division multiple access soft handover method, base station and system

Technical field

The present invention relates to communication field, relate in particular to soft handover method, base station and system in a kind of code division multiple access system.

Background technology

At present, in CDMA2000 1x system, travelling carriage can adopt the mode of absolute thresholding or the mode of dynamic threshold in the time that talking state is carried out soft handover.

In the time adopting the switching mode of absolute thresholding, the following (see figure 1) of handoff procedure:

A) travelling carriage detects when the intensity of certain pilot tone exceedes the parameter T_ADD that Current Serving BTS issues, travelling carriage can send Pilot Strength Measurement Message (PilotStrength Measurement Message to Current Serving BTS, be called for short PSMM), and this pilot tone is listed in to Candidate Set;

B) Current Serving BTS sends switch indicating information (extended handoff direction messages EHDM, common switch indicating information GHDM or general switch indicating information UHDM) to travelling carriage after receiving this message;

C) travelling carriage is listed this pilot tone Active Set in and is sent handoff completion message (Handoff Complete Message is called for short HCM) to Current Serving BTS, now completes the process that soft handover pilot tone adds;

D) in the time of parameter T_DROP that the intensity of certain pilot tone in travelling carriage Active Set issues lower than Current Serving BTS, timer initiation is removed in its corresponding switching;

E), in the time that timer value reaches T_TDROP, travelling carriage sends PSMM message to Current Serving BTS;

F) Current Serving BTS sends switch indicating information to travelling carriage after receiving this message;

G) travelling carriage moves into Candidate Set by this pilot tone after receiving switch indicating information, and sends HCM message to Current Serving BTS, now completes the process that soft handover pilot tone is deleted.

In the time adopting the switching mode of dynamic threshold, handoff procedure following (as shown in Figure 2):

A) travelling carriage detects that new pilot tone P2 intensity exceedes the parameter T_ADD that Current Serving BTS issues, and this pilot tone is moved into Candidate Set;

B) when pilot tone P2 intensity meets following formula

$P2>[(\mathrm{SOFT}\_\mathrm{SLOPE}/8)\×10\×\log 10\left(\underset{i\∈A}{\mathrm{\Σ}}\mathrm{Psi}\right)+\mathrm{ADD}\_\mathrm{INTERCEPT}/2],$

Travelling carriage sends PSMM message, and wherein ADD_INTERCEPT represents to calculate the offset parameter of pilot tone comparison threshold, and Psi represents the intensity of i pilot tone of Active Set, and SOFT_SLOPE represents to calculate the Slope Parameters of pilot tone comparison threshold;

C) travelling carriage is received after the switch indicating information of sending base station, and pilot tone P2 is joined to active set, and sends HCM message, now completes the process that soft handover pilot tone adds;

D) when certain the pilot tone P1 strength decreased in Active Set is to meeting following formula

$P1<[(\mathrm{SOFT}\_\mathrm{SLOPE}/8)\&times;10\&times;\log 10\left(\underset{i\&Element;A}{\mathrm{\&Sigma;}}\mathrm{Psi}\right)+\mathrm{DROP}\_\mathrm{INTERCEPT}/2],$

Travelling carriage starts switching and removes timer, and DROP_INTERCEPT represents to calculate the offset parameter of pilot tone comparison threshold;

E) switch and remove timer expiry, travelling carriage sends PSMM message;

F) travelling carriage is received switch indicating information.Pilot tone P1 is sent into Candidate Set and sends HCM;

If g) pilot tone P1 intensity is lower than T_DROP, travelling carriage starts switching and removes timer;

H) switch and remove timer expiry, travelling carriage moves into Neighbor Set pilot tone P1 from Candidate Set, now completes the process that soft handover pilot tone is deleted.

Two kinds of switching modes of CDMA2000 1x system soft handover all cannot guide traffic, cannot in network operation process, cannot dynamically adjust handoff parameter according to the actual load condition of network, with the traffic of reasonable equalizing network, improve percept of call completed.

Summary of the invention

Inventor notices that the major defect of existing soft handoff is to have adopted fixing handoff parameter, mainly carry out soft handover by the Ec/Io that compares pilot signal, therefore the object of the invention is to propose a kind of code division multiple access soft handover method, base station and system, can in network operation process, dynamically adjust handoff parameter according to the actual load condition of network, with the traffic of reasonable equalizing network, improve percept of call completed.

For achieving the above object, the invention provides a kind of code division multiple access soft handover method, comprising:

In network operation process, adjustment of load parameter is set in the system parameters message based on load of base station situation in the paging channel of the resident community of described travelling carriage;

According to described adjustment of load parameter, the base station handoff threshold of original setting is adjusted, obtained new base station handoff threshold;

In the time of the system parameters message of travelling carriage periodicity monitoring seek channel under idle condition, described new base station handoff threshold is issued to described travelling carriage by base station;

Described travelling carriage carries out corresponding handover operation according to the result of the pilot frequency intensity relatively detecting and described new base station handoff threshold.

Preferably, for the soft handoff that adopts absolute thresholding, the described operation of the base station handoff threshold of original setting being adjusted according to described adjustment of load parameter is specially:

Detection of pilot thresholding T_ADD_s according to described adjustment of load parameter to original setting and pilot tone are removed thresholding T_DROP_s and are adjusted, and adjustment formula is respectively:

New detection of pilot thresholding T_ADD=T_ADD_s-LoadingAdjust;

New pilot tone is removed thresholding T_DROP=T_DROP_s+LoadingAdjust;

Wherein, LoadingAdjust represents described adjustment of load parameter.

Preferably, for the soft handoff that adopts relative threshold, the described operation of the base station handoff threshold of original setting being adjusted according to described adjustment of load parameter is specially:

Detection of pilot thresholding T_ADD_s according to described adjustment of load parameter to original setting, pilot tone are removed thresholding T_DROP_s, pilot tone adds intercept ADD_INTERCEPT_s and pilot tone removal intercept DROP_INTERCEPT_s to adjust, and adjustment formula is respectively:

New detection of pilot thresholding T_ADD=T_ADD_s-LoadingAdjust;

New pilot tone is removed thresholding T_DROP=T_DROP_s+LoadingAdjust;

New pilot tone adds intercept

ADD_INTERCEPT＝ADD_INTERCEPT_s-LoadingAdjust；

New pilot tone is removed intercept

DROP_INTERCEPT＝DROP_INTERCEPT_s+LoadingAdjust；

Wherein, LoadingAdjust represents described adjustment of load parameter.

Further, in the time that described adjustment of load parameter is set, the load of base station prestoring in base station according to current base station load query and the mapping table of adjusting parameter, the numerical value of selecting the adjustment of load parameter corresponding with current base station load arranges described adjustment of load parameter.

Further, in the mapping table of described load of base station and adjustment parameter, lower load of base station is corresponding to the arithmetic value of less adjustment of load parameter, and higher load of base station is corresponding to the arithmetic value of larger adjustment of load parameter.

For achieving the above object, the invention provides a kind of CDMA base, comprising:

Parameter arranges module, in network operation process, adjustment of load parameter is set in the system parameters message based on load of base station situation in the paging channel of the resident community of described travelling carriage;

Thresholding adjusting module, for the base station handoff threshold of original setting being adjusted according to described adjustment of load parameter, obtains new base station handoff threshold;

Thresholding issues module, for periodically when the system parameters message of monitoring seek channel, described new base station handoff threshold being issued to described travelling carriage at travelling carriage under idle condition.

Preferably, described thresholding adjusting module comprises:

Detection of pilot thresholding adjusting module, for the detection of pilot thresholding T_ADD_s of original setting being adjusted according to described adjustment of load parameter, adjustment formula is:

New detection of pilot thresholding T_ADD=T_ADD_s-LoadingAdjust;

Pilot tone is removed thresholding adjusting module, adjusts for the pilot tone of original setting being removed to thresholding T_DROP_s according to described adjustment of load parameter, and adjustment formula is respectively:

New pilot tone is removed thresholding T_DROP=T_DROP_s+LoadingAdjust;

Wherein, LoadingAdjust represents described adjustment of load parameter.

Preferably, described thresholding adjusting module comprises:

Detection of pilot thresholding adjusting module, for the detection of pilot thresholding T_ADD_s of original setting being adjusted according to described adjustment of load parameter, adjustment formula is:

New detection of pilot thresholding T_ADD=T_ADD_s-LoadingAdjust;

Pilot tone is removed thresholding adjusting module, adjusts for the pilot tone of original setting being removed to thresholding T_DROP_s according to described adjustment of load parameter, and adjustment formula is respectively:

New pilot tone is removed thresholding T_DROP=T_DROP_s+LoadingAdjust;

Pilot tone adds intercept adjusting module, and for adding intercept ADD_INTERCEPT_s to adjust according to described adjustment of load parameter to the pilot tone of original setting, adjustment formula is respectively:

New pilot tone adds intercept

ADD_INTERCEPT＝ADD_INTERCEPT_s-LoadingAdjust；

Pilot tone is removed intercept adjusting module, adjusts for the pilot tone of original setting being removed to intercept DROP_INTERCEPT_s according to described adjustment of load parameter, and adjustment formula is respectively:

New pilot tone adds intercept

DROP_INTERCEPT＝DROP_INTERCEPT_s+LoadingAdjust；

Wherein, LoadingAdjust represents described adjustment of load parameter.

Further, also comprise:

Mapping table memory module, for load of base station and the mapping table of adjusting parameter of prestoring;

Parameter table look-up module, while described adjustment of load parameter being set for module being set in described parameter, according to the load of base station of mapping table memory module storage described in current base station load query and the mapping table of adjusting parameter, select the numerical value of the adjustment of load parameter corresponding with current base station load, and offer described parameter and module is set described adjustment of load parameter is arranged.

Further, in the mapping table of described load of base station and adjustment parameter, lower load of base station is corresponding to the arithmetic value of less adjustment of load parameter, and higher load of base station is corresponding to the arithmetic value of larger adjustment of load parameter.

For achieving the above object, the invention provides a kind of code division multiple access soft switching system that comprises aforementioned CDMA base, also comprise:

Travelling carriage, while being used for the system parameters message of periodicity monitoring seek channel under idle condition, receive the described new base station handoff threshold that base station issues, and carry out corresponding handover operation according to the result of the pilot frequency intensity relatively detecting and described new base station handoff threshold.

Based on technique scheme, the present invention is directed to available technology adopting and fix the defect that the switching mode of handoff parameter cannot guide traffic etc., introduce adjustment of load parameter in base station side, can in network operation process, adjust fixing handoff parameter according to the actual load condition of network by the value that different adjustment of load parameters is set, with the traffic of reasonable equalizing network, improve percept of call completed; In another embodiment, by load of base station and the mapping table of adjusting parameter of prestoring, realize the handoff parameter of dynamically adjusting travelling carriage according to the variation of load of base station in network operation process, and then make in the situation that load of base station is lighter, travelling carriage more easily remains under former base station and converses, in the situation that load of base station is heavier, travelling carriage is more prone to be switched to adjacent cell, thereby reaches the object of minizone load balancing.

Brief description of the drawings

Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the handoff procedure schematic diagram of the switching mode of the absolute thresholding of available technology adopting.

Fig. 2 is the handoff procedure schematic diagram of the switching mode of available technology adopting relative threshold.

Fig. 3 is the schematic flow sheet of an embodiment of code division multiple access soft handover method of the present invention.

Fig. 4 a-4b is the handoff procedure schematic diagram that code division multiple access soft handover method embodiment of the present invention adopts the switching mode of absolute thresholding.

Fig. 5 a-5b is the handoff procedure schematic diagram that code division multiple access soft handover method embodiment of the present invention adopts the switching mode of relative threshold.

Fig. 6 is the structural representation of an embodiment of CDMA base of the present invention.

Fig. 7 is the structural representation of another embodiment of CDMA base of the present invention.

Embodiment

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

As shown in Figure 3, be the schematic flow sheet of an embodiment of code division multiple access soft handover method of the present invention.In the present embodiment, this code division multiple access soft handover method comprises the following steps:

Step 101, in network operation process, adjustment of load parameter is set in the system parameters message based on load of base station situation in the paging channel of the resident community of described travelling carriage;

Step 102, according to described adjustment of load parameter, the base station handoff threshold of original setting is adjusted, obtained new base station handoff threshold;

Step 103, at travelling carriage under idle condition periodically when the system parameters message of monitoring seek channel, described new base station handoff threshold is issued to described travelling carriage by base station;

Step 104, described travelling carriage carry out corresponding handover operation according to the result of the pilot frequency intensity relatively detecting and described new base station handoff threshold.

The present invention has introduced adjustment of load parameter L oadingAdjust in base station side, this parameter can be set to different values according to load of base station situation in network operation process, then based on this adjustment of load parameter, base station handoff threshold is adjusted, and be issued in travelling carriage by system parameters message (In-Traffic System Parameter Message), thereby provide the handoff parameter of revocable soft handover to travelling carriage, realize the desired traffic guiding of base station side and control, rationally the traffic of equalizing network, improves percept of call completed.

For adopting absolute thresholding to carry out the situation of soft handover, need to adjust the base station handoff threshold of original setting according to adjustment of load parameter L oadingAdjust, wherein, parameter T_ADD_s is the detection of pilot thresholding of original start, be fixed gate limit value of the prior art, and the computing formula of new detection of pilot thresholding T_ADD after adjusting is:

T_ADD＝T_ADD_s-LoadingAdjust；

Parameter T_DROP_s is that the pilot tone of original start is removed thresholding, and new pilot tone after adjusting is removed the computing formula of thresholding T_DROP and is:

T_DROP＝T_DROP_s+LoadingAdjust。

The new base station handoff threshold that these calculate will be handed down to travelling carriage by system parameters message, and travelling carriage can carry out corresponding operating in soft handover according to these new base station handoff thresholds.Illustrate that below in conjunction with Fig. 4 a-4b code division multiple access soft handover method embodiment of the present invention adopts the handoff procedure of the switching mode of absolute thresholding.

In Fig. 4 a, the load of Current Serving BTS is higher, and therefore LoadingAdjust is made as the numerical value that is greater than zero, judges that at time point a travelling carriage certain pilot frequency intensity has exceeded new T_ADD, can send PSMM to Current Serving BTS, and this pilot tone is listed in to Candidate Set.Can find out because new T_ADD is less than original T_ADD_s, make travelling carriage send the time advance of PSMM to Current Serving BTS, in other words, guiding travelling carriage is more easily switched to new base station from current base station, thereby realizes the load balancing between base station.In like manner, time point b, c all cause shifting to an earlier date to some extent because new T_ADD is less than original T_ADD_s.

At time point d, when in travelling carriage Active Set, the intensity of certain pilot tone is lower than new T_DROP, timer initiation is removed in corresponding switching.Can find out because new T_DROP is greater than original T_DROP_s, travelling carriage can startup switching more early be removed timer and in Active Set, delete this pilot tone, in other words, because the load of Current Serving BTS is higher, therefore guide travelling carriage can more early from Active Set, delete this pilot tone, thereby realize the load balancing between base station.

The LoadingAdjust that is greater than zero by setting, can make the service range of Current Serving BTS shrink, and then reduce the load level of this serving BS.

In Fig. 4 b, the load of Current Serving BTS is lower, and therefore LoadingAdjust is made as minus numerical value, judges that at time point a travelling carriage certain pilot frequency intensity has exceeded new T_ADD, can send PSMM to Current Serving BTS, and this pilot tone is listed in to Candidate Set.Can find out because new T_ADD is greater than original T_ADD_s, the time that makes travelling carriage send PSMM to Current Serving BTS has been delayed, in other words, travelling carriage is more difficult is switched to new base station from current base station in guiding, thereby effectively utilize the resources for traffic of Current Serving BTS, and then realize the load balancing between base station.In like manner, time point b, c all cause delaying to some extent because new T_ADD is greater than original T_ADD_s.

At time point d, when in travelling carriage Active Set, the intensity of certain pilot tone is lower than new T_DROP, timer initiation is removed in corresponding switching.Can find out because new T_DROP is less than original T_DROP_s, make the startup switching that travelling carriage can be more late remove timer and in Active Set, delete this pilot tone, in other words, because the load of current base station is lower, what therefore guide that travelling carriage can be more late deletes this pilot tone from Active Set, thereby can utilize fully the resources for traffic of Current Serving BTS, and then realize the load balancing between base station.

By minus LoadingAdjust is set, can makes the service range of Current Serving BTS amplify, and then improve the load level of this serving BS.

For adopting relative threshold to carry out the situation of soft handover, need to adjust the base station handoff threshold of original setting according to adjustment of load parameter L oadingAdjust, wherein, parameter T_ADD_s is the detection of pilot thresholding of original start, be fixed gate limit value of the prior art, and the computing formula of new detection of pilot thresholding T_ADD after adjusting is:

T_ADD＝T_ADD_s-LoadingAdjust；

Parameter T_DROP_s is that the pilot tone of original start is removed thresholding, and new pilot tone after adjusting is removed the computing formula of thresholding T_DROP and is:

T_DROP＝T_DROP_s+LoadingAdjust；

Parameter A DD_INTERCEPT_s is that the pilot tone of original start adds intercept, and adjust after new pilot tone add the computing formula of intercept ADD_INTERCEPT to be:

ADD_INTERCEPT＝ADD_INTERCEPT_s-LoadingAdjust；

Parameter DROP_INTERCEPT_s is that the pilot tone of original start adds intercept, and adjust after new pilot tone add the computing formula of intercept DROP_INTERCEPT to be:

DROP_INTERCEPT＝DROP_INTERCEPT_s-LoadingAdjust。

The new base station handoff threshold that these calculate will be handed down to travelling carriage by system parameters message, and travelling carriage can carry out corresponding operating in soft handover according to these new base station handoff thresholds.Illustrate that below in conjunction with Fig. 5 a-5b code division multiple access soft handover method embodiment of the present invention adopts the handoff procedure of the switching mode of absolute thresholding.

In Fig. 5 a, the load of Current Serving BTS is higher, therefore LoadingAdjust is made as the numerical value that is greater than zero, judge that at time point a travelling carriage the pilot frequency intensity of new pilot tone P2 has exceeded new T_ADD, pilot tone P2 is moved into Candidate Set, the time of implementation of this action shifts to an earlier date because new T_ADD is less than T_ADD_s.Calculating through following formula:

$P2>[(\mathrm{SOFT}\_\mathrm{SLOPE}/8)\&times;10\&times;\log 10\left(\underset{i\&Element;A}{\mathrm{\&Sigma;}}\mathrm{Psi}\right)+\mathrm{ADD}\_\mathrm{INTERCEPT}/2],$

If pilot tone P2 meets above-mentioned inequality, can send PSMM to Current Serving BTS.Because new ADD_INTERCEPT is less than ADD_INTERCEPT_s, therefore the numerical value of above-mentioned inequality right-hand component reduces, and makes P2 more easily meet above-mentioned inequality, thereby easier to Current Serving BTS transmission PSMM.Because the load of Current Serving BTS is higher, wish that guiding travelling carriage is switched to adjacent base station, therefore by Current Serving BTS arrange LoadingAdjust parameter adjustment base station handoff threshold, make the easier base station that is switched to pilot tone P2 from Current Serving BTS of travelling carriage.

At time point d, the strength decreased of the pilot tone P1 in Active Set is to meeting following formula:

$P1<[(\mathrm{SOFT}\_\mathrm{SLOPE}/8)\&times;10\&times;\log 10\left(\underset{i\&Element;A}{\mathrm{\&Sigma;}}\mathrm{Psi}\right)+\mathrm{DROP}\_\mathrm{INTERCEPT}/2],$

Travelling carriage starts switching and removes timer, and in the time of this timer expiry, travelling carriage sends PSMM to Current Serving BTS.Because new DROP_INTERCEPT is greater than DROP_INTERCEPT_s, therefore the numerical value of above-mentioned inequality right-hand component increases, and makes P1 more easily meet above-mentioned inequality, thereby timer is removed in easier startup switching.At time point g, the strength decreased of pilot tone P1 arrives lower than new T_DROP, and travelling carriage starts switching and removes timer, and when this timer expiry, travelling carriage moves into Neighbor Set by pilot tone P1 from Candidate Set.

Because new T_DROP is greater than T_DROP_s, therefore more easily meet to start and switch the operation of removing timer, in other words, because the load of Current Serving BTS is higher, therefore guide travelling carriage can more early from Active Set, delete this pilot tone, thereby realize the load balancing between base station.

In Fig. 5 b, the load of Current Serving BTS is lower, therefore LoadingAdjust is made as minus numerical value, judge that at time point a travelling carriage the pilot frequency intensity of new pilot tone P2 has exceeded new T_ADD, pilot tone P2 is moved into Candidate Set, the time of implementation of this action is delayed because new T_ADD is greater than T_ADD_s.Calculating through following formula:

$P2>[(\mathrm{SOFT}\_\mathrm{SLOPE}/8)\&times;10\&times;\log 10\left(\underset{i\&Element;A}{\mathrm{\&Sigma;}}\mathrm{Psi}\right)+\mathrm{ADD}\_\mathrm{INTERCEPT}/2],$

If pilot tone P2 meets above-mentioned inequality, can send PSMM to Current Serving BTS.Because new ADD_INTERCEPT is greater than ADD_INTERCEPT_s, therefore the numerical value of above-mentioned inequality right-hand component increases, and makes that P2 is more difficult meets above-mentioned inequality, thereby more difficultly sends PSMM to Current Serving BTS.Because the load of Current Serving BTS is lower, wish that guiding travelling carriage remains on Current Serving BTS, therefore by Current Serving BTS arrange LoadingAdjust parameter adjustment base station handoff threshold, travelling carriage is more easily remained under current base station and converses.

At time point d, the strength decreased of the pilot tone P1 in Active Set is to meeting following formula:

$P1<[(\mathrm{SOFT}\_\mathrm{SLOPE}/8)\&times;10\&times;\log 10\left(\underset{i\&Element;A}{\mathrm{\&Sigma;}}\mathrm{Psi}\right)+\mathrm{DROP}\_\mathrm{INTERCEPT}/2],$

Travelling carriage starts switching and removes timer, and in the time of this timer expiry, travelling carriage sends PSMM to Current Serving BTS.Because new DROP_INTERCEPT is less than DROP_INTERCEPT_s, therefore the numerical value of above-mentioned inequality right-hand component reduces, and makes that P1 is more difficult meets above-mentioned inequality, thereby more difficult startup is switched and removed timer.At time point g, the strength decreased of pilot tone P1 arrives lower than new T_DROP, and travelling carriage starts switching and removes timer, and when this timer expiry, travelling carriage moves into Neighbor Set by pilot tone P1 from Candidate Set.

Because new T_DROP is less than T_DROP_s, therefore the operation of removing timer is switched in more difficult satisfied startup, in other words, and because the load of Current Serving BTS is lower, therefore guide travelling carriage can in Active Set, keep this pilot tone, thereby realize the load balancing between base station.

LoadingAdjust parameter can adopt manual setting, also can reduce by base station Lookup protocol the workload of optimization, load of base station and the mapping table of adjusting parameter prestore in base station, in the time that adjustment of load parameter is set, the load of base station that can prestore in base station according to current base station load query and the mapping table of adjusting parameter, the numerical value of selecting the adjustment of load parameter corresponding with current base station load arranges described adjustment of load parameter.For instance, load of base station can be stored following mapping relations with the mapping table of adjusting parameter:

When load of base station < 30%: LoadingAdjust=-1dB

When 30%≤load of base station < 40%: LoadingAdjust=-0.5dB

When 40%≤load of base station < 50%: LoadingAdjust=0dB

When 50%≤load of base station < 60%: LoadingAdjust=0.5dB

When load of base station >=60%: LoadingAdjust=1dB

These are only for example; should not be considered as limiting the scope of the invention; in the mapping table of load of base station and adjustment parameter, meet the arithmetic value of lower load of base station corresponding to less adjustment of load parameter; higher load of base station is corresponding to the arithmetic value of larger adjustment of load parameter, and the corresponding load of base station of positive negative value of LoadingAdjust can be set according to the actual conditions of network.For LoadingAdjust parameter, in the time that load of base station is lower, can sets LoadingAdjust parameter and be greater than 0, detection of pilot thresholding is increased, pilot tone is removed thresholding and is reduced, and is equivalent to terminal and more easily remains on former community and converse.In the time that load of base station is larger, can set LoadingAdjust parameter and be greater than 0, detection of pilot thresholding is reduced, pilot tone is removed thresholding and is increased, and is equivalent to terminal and more easily switches Chu Yuan community, and then realize the equilibrium between load of base station.

By the value of above-mentioned dynamic adjustment LoadingAdjust parameter, do not need network optimization personnel to carry out manual configuration according to network condition, so just reduce the workload of optimizing, and guiding user is switched and heavy duty community, the cell load of equalizing network, the utilance that improves the network equipment has great importance.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, in the time carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.

The present invention also provides a kind of code division multiple access soft switching system, comprise CDMA base and travelling carriage in system, wherein travelling carriage is under idle condition periodically when the system parameters message of monitoring seek channel, receive the described new base station handoff threshold that base station issues, and carry out corresponding handover operation according to the result of the pilot frequency intensity relatively detecting and described new base station handoff threshold.CDMA base is wherein shown in Figure 6.This CDMA base comprises: parameter arranges module 1, thresholding adjusting module 2 and thresholding and issues module 3.Wherein, parameter arranges module 1 in network operation process, and adjustment of load parameter is set in the system parameters message based on load of base station situation in the paging channel of the resident community of described travelling carriage.Thresholding adjusting module 2, for the base station handoff threshold of original setting being adjusted according to described adjustment of load parameter, obtains new base station handoff threshold.Thresholding issues module 3 for periodically when the system parameters message of monitoring seek channel, described new base station handoff threshold being issued to described travelling carriage at travelling carriage under idle condition.

In another embodiment, thresholding adjusting module can comprise:

Detection of pilot thresholding adjusting module, for the detection of pilot thresholding T_ADD_s of original setting being adjusted according to described adjustment of load parameter, adjustment formula is:

New detection of pilot thresholding T_ADD=T_ADD_s-LoadingAdjust;

Pilot tone is removed thresholding adjusting module, adjusts for the pilot tone of original setting being removed to thresholding T_DROP_s according to described adjustment of load parameter, and adjustment formula is respectively:

New pilot tone is removed thresholding T_DROP=T_DROP_s+LoadingAdjust;

Wherein, LoadingAdjust represents described adjustment of load parameter.

In the present embodiment, this thresholding adjusting module is mainly applicable to adopt the switching mode of absolute thresholding.

In another embodiment, thresholding adjusting module can also comprise:

Detection of pilot thresholding adjusting module, for the detection of pilot thresholding T_ADD_s of original setting being adjusted according to described adjustment of load parameter, adjustment formula is:

New detection of pilot thresholding T_ADD=T_ADD_s-LoadingAdjust;

Pilot tone is removed thresholding adjusting module, adjusts for the pilot tone of original setting being removed to thresholding T_DROP_s according to described adjustment of load parameter, and adjustment formula is respectively:

New pilot tone is removed thresholding T_DROP=T_DROP_s+LoadingAdjust;

Pilot tone adds intercept adjusting module, and for adding intercept ADD_INTERCEPT_s to adjust according to described adjustment of load parameter to the pilot tone of original setting, adjustment formula is respectively:

New pilot tone adds intercept

ADD_INTERCEPT＝ADD_INTERCEPT_s-LoadingAdjust；

Pilot tone is removed intercept adjusting module, adjusts for the pilot tone of original setting being removed to intercept DROP_INTERCEPT_s according to described adjustment of load parameter, and adjustment formula is respectively:

New pilot tone adds intercept

DROP_INTERCEPT＝DROP_INTERCEPT_s+LoadingAdjust；

Wherein, LoadingAdjust represents described adjustment of load parameter.

In the present embodiment, this thresholding adjusting module is mainly applicable to adopt the switching mode of absolute thresholding.

The above embodiment of the present invention has been introduced adjustment of load parameter L oadingAdjust in base station side, this parameter can be set to different values according to load of base station situation in network operation process, then based on this adjustment of load parameter, base station handoff threshold is adjusted, and be issued in travelling carriage by system parameters message (In-Traffic System Parameter Message), thereby provide the handoff parameter of revocable soft handover to travelling carriage, realize the desired traffic guiding of base station side and control, the rationally traffic of equalizing network, improve percept of call completed.What no matter adopt is the switching mode of absolute thresholding, still adopts the switching mode of relative threshold, all can realize the desired traffic guiding of base station side and control, and reaches the traffic of reasonable equalizing network, improves the effect of percept of call completed.

As shown in Figure 7, be the structural representation of another embodiment of CDMA base of the present invention.Compared with previous embodiment, the present embodiment also comprises: mapping table memory module 4 and parameter table look-up module 5.Wherein, mapping table memory module 4 is for load of base station and the mapping table of adjusting parameter of prestoring.When parameter table look-up module 5 arranges described adjustment of load parameter for module 1 being set in described parameter, the load of base station of storing according to mapping table memory module 4 described in current base station load query and the mapping table of adjusting parameter, select the numerical value of the adjustment of load parameter corresponding with current base station load, and offer described parameter and module 1 is set described adjustment of load parameter is arranged.

In the mapping table of load of base station and adjustment parameter, can be arranged to such corresponding relation: lower load of base station is corresponding to the arithmetic value of less adjustment of load parameter, and higher load of base station is corresponding to the arithmetic value of larger adjustment of load parameter.The corresponding load of base station of positive negative value of adjustment of load parameter can be set according to the actual conditions of network.

By the value of above-mentioned dynamic adjustment adjustment of load parameter, do not need network optimization personnel to carry out manual configuration according to network condition, so just reduce the workload of optimizing, and guiding user is switched and heavy duty community, the cell load of equalizing network, the utilance that improves the network equipment has great importance.

Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characterictic is equal to replacement the specific embodiment of the present invention; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request protection of the present invention.

Claims (5)

1. a code division multiple access soft handover method, comprising:

In network operation process, adjustment of load parameter is set in the system parameters message based on load of base station situation in the paging channel of the resident community of travelling carriage;

According to described adjustment of load parameter, the base station handoff threshold of original setting is adjusted, obtained new base station handoff threshold;

In the time of the system parameters message of travelling carriage periodicity monitoring seek channel under idle condition, described new base station handoff threshold is issued to described travelling carriage by base station;

Described travelling carriage carries out corresponding handover operation according to the result of the pilot frequency intensity relatively detecting and described new base station handoff threshold;

In the time that described adjustment of load parameter is set, the load of base station prestoring in base station according to current base station load query and the mapping table of adjusting parameter, the numerical value of selecting the adjustment of load parameter corresponding with current base station load arranges described adjustment of load parameter, wherein in the mapping table of described load of base station and adjustment parameter, lower load of base station is corresponding to the arithmetic value of less minus adjustment of load parameter, and higher load of base station is corresponding to the arithmetic value of the larger adjustment of load parameter that is greater than zero;

For the soft handoff that adopts absolute thresholding, the described operation of the base station handoff threshold of original setting being adjusted according to described adjustment of load parameter is specially:

Detection of pilot thresholding T_ADD_s according to described adjustment of load parameter to original setting and pilot tone are removed thresholding T_DROP_s and are adjusted, and adjustment formula is respectively:

New detection of pilot thresholding T_ADD=T_ADD_s-LoadingAdjust;

New pilot tone is removed thresholding T_DROP=T_DROP_s+LoadingAdjust;

Wherein, LoadingAdjust represents described adjustment of load parameter.

2. a code division multiple access soft handover method, comprising:

In network operation process, adjustment of load parameter is set in the system parameters message based on load of base station situation in the paging channel of the resident community of travelling carriage;

According to described adjustment of load parameter, the base station handoff threshold of original setting is adjusted, obtained new base station handoff threshold;

In the time of the system parameters message of travelling carriage periodicity monitoring seek channel under idle condition, described new base station handoff threshold is issued to described travelling carriage by base station;

Described travelling carriage carries out corresponding handover operation according to the result of the pilot frequency intensity relatively detecting and described new base station handoff threshold;

In the time that described adjustment of load parameter is set, the load of base station prestoring in base station according to current base station load query and the mapping table of adjusting parameter, the numerical value of selecting the adjustment of load parameter corresponding with current base station load arranges described adjustment of load parameter, wherein in the mapping table of described load of base station and adjustment parameter, lower load of base station is corresponding to the arithmetic value of less minus adjustment of load parameter, and higher load of base station is corresponding to the arithmetic value of the larger adjustment of load parameter that is greater than zero;

For the soft handoff that adopts relative threshold, the described operation of the base station handoff threshold of original setting being adjusted according to described adjustment of load parameter is specially:

Detection of pilot thresholding T_ADD_s according to described adjustment of load parameter to original setting, pilot tone are removed thresholding T_DROP_s, pilot tone adds intercept ADD_INTERCEPT_s and pilot tone removal intercept DROP_INTERCEPT_s to adjust, and adjustment formula is respectively:

New detection of pilot thresholding T_ADD=T_ADD_s-LoadingAdjust;

New pilot tone is removed thresholding T_DROP=T_DROP_s+LoadingAdjust;

New pilot tone adds intercept

ADD_INTERCEPT＝ADD_INTERCEPT_s-LoadingAdjust；

New pilot tone is removed intercept

DROP_INTERCEPT＝DROP_INTERCEPT_s+LoadingAdjust；

Wherein, LoadingAdjust represents described adjustment of load parameter.

3. a CDMA base, comprising:

Parameter arranges module, in network operation process, adjustment of load parameter is set in the system parameters message based on load of base station situation in the paging channel of the resident community of travelling carriage;

Thresholding adjusting module, for the base station handoff threshold of original setting being adjusted according to described adjustment of load parameter, obtains new base station handoff threshold;

Thresholding issues module, for periodically when the system parameters message of monitoring seek channel, described new base station handoff threshold being issued to described travelling carriage at travelling carriage under idle condition;

Mapping table memory module, for load of base station and the mapping table of adjusting parameter of prestoring, in the mapping table of described load of base station and adjustment parameter, lower load of base station is corresponding to the arithmetic value of less minus adjustment of load parameter, and higher load of base station is corresponding to the arithmetic value of the larger adjustment of load parameter that is greater than zero;

Parameter table look-up module, while described adjustment of load parameter being set for module being set in described parameter, according to the load of base station of mapping table memory module storage described in current base station load query and the mapping table of adjusting parameter, select the numerical value of the adjustment of load parameter corresponding with current base station load, and offer described parameter and module is set described adjustment of load parameter is arranged;

Wherein, described thresholding adjusting module comprises:

Detection of pilot thresholding adjusting module, for the detection of pilot thresholding T_ADD_s of original setting being adjusted according to described adjustment of load parameter, adjustment formula is:

New detection of pilot thresholding T_ADD=T_ADD_s-LoadingAdjust;

Pilot tone is removed thresholding adjusting module, adjusts for the pilot tone of original setting being removed to thresholding T_DROP_s according to described adjustment of load parameter, and adjustment formula is respectively:

New pilot tone is removed thresholding T_DROP=T_DROP_s+LoadingAdjust;

Wherein, LoadingAdjust represents described adjustment of load parameter.

4. a CDMA base, comprising:

Parameter arranges module, in network operation process, adjustment of load parameter is set in the system parameters message based on load of base station situation in the paging channel of the resident community of travelling carriage;

Thresholding adjusting module, for the base station handoff threshold of original setting being adjusted according to described adjustment of load parameter, obtains new base station handoff threshold;

Thresholding issues module, for periodically when the system parameters message of monitoring seek channel, described new base station handoff threshold being issued to described travelling carriage at travelling carriage under idle condition;

Mapping table memory module, for load of base station and the mapping table of adjusting parameter of prestoring, in the mapping table of described load of base station and adjustment parameter, lower load of base station is corresponding to the arithmetic value of less minus adjustment of load parameter, and higher load of base station is corresponding to the arithmetic value of the larger adjustment of load parameter that is greater than zero;

Parameter table look-up module, while described adjustment of load parameter being set for module being set in described parameter, according to the load of base station of mapping table memory module storage described in current base station load query and the mapping table of adjusting parameter, select the numerical value of the adjustment of load parameter corresponding with current base station load, and offer described parameter and module is set described adjustment of load parameter is arranged;

Wherein, described thresholding adjusting module comprises:

Detection of pilot thresholding adjusting module, for the detection of pilot thresholding T_ADD_s of original setting being adjusted according to described adjustment of load parameter, adjustment formula is:

New detection of pilot thresholding T_ADD=T_ADD_s-LoadingAdjust;

Pilot tone is removed thresholding adjusting module, adjusts for the pilot tone of original setting being removed to thresholding T_DROP_s according to described adjustment of load parameter, and adjustment formula is respectively:

New pilot tone is removed thresholding T_DROP=T_DROP_s+LoadingAdjust;

Pilot tone adds intercept adjusting module, and for adding intercept ADD_INTERCEPT_s to adjust according to described adjustment of load parameter to the pilot tone of original setting, adjustment formula is respectively:

New pilot tone adds intercept

ADD_INTERCEPT＝ADD_INTERCEPT_s-LoadingAdjust；

Pilot tone is removed intercept adjusting module, adjusts for the pilot tone of original setting being removed to intercept DROP_INTERCEPT_s according to described adjustment of load parameter, and adjustment formula is respectively:

New pilot tone adds intercept

DROP_INTERCEPT＝DROP_INTERCEPT_s+LoadingAdjust；

Wherein, LoadingAdjust represents described adjustment of load parameter.

5. a code division multiple access soft switching system that comprises the CDMA base described in claim 3 or 4, also comprises:

Travelling carriage, while being used for the system parameters message of periodicity monitoring seek channel under idle condition, receive the described new base station handoff threshold that base station issues, and carry out corresponding handover operation according to the result of the pilot frequency intensity relatively detecting and described new base station handoff threshold.