CN102014450B - Optimizing method of switching parameters on network line - Google Patents

Abstract

The invention relates to the technical field of switching method in wired communication, in particular to an optimizing method of switching parameters on a network line. The method is characterized by comprising the following steps: inputting basic data, simulating reporting data, simulating the switching process, correcting the parameters, locating the failure cell, and searching the handoff parameters; the definition of the failure cell is as follows: ping-pong switching cell, wherein PCCPCHRSCP is less than Tareget1 or PCCPCH C/I is smaller than Target 2 due to too early or too late switching or switching failure; a is switched to b caused by too large switching value delay or too large switching time delay, b is switched to c cell if the main control time of b is very small; switching to cell in non-motion direction if the switching value delay is too small or if the switching time delay is small; and the method has high optimization efficiency, shortens the optimization time, reduces the work load, guarantees good optimization effect, and has low cost.

Description

The optimization method of the handoff parameter on a kind of network route

[technical field]

The present invention relates to the technical field of changing method in radio communication, specifically the optimization method of the handoff parameter on a kind of network route.

[background technology]

For mobile communication, crucial problem is the continuous covering in moving process, and this just relates to switching.At present, because arranging the unreasonable problem causing, handoff parameter has: switch not in time, switch too early, handoff error, pingpang handoff etc.Find out a set of handoff parameter, satisfied needs are on the same road supported the motion of different motion speed, different motion direction simultaneously.

Chinese patent 03813142.0 disclose a kind of in cellular telecommunication network the method for optimizing handoff lagged value, the signal strength measurement that mobile radio station in Yong Liaocong community obtains, based on these, measure, mid point algorithm has calculated the possible lagged value of the best for out and Incoming handover; Shortcoming is to need mass data to report, and easily causes data to stop up, and can not meet the handoff parameter in different motion speed and the direction of motion.

[summary of the invention]

The object of the invention is to have made up existing switching optimization method and mainly rely on artificial experience weak effect and the adjustment of handoff parameter adjustment-> road test checking-> handoff parameter ... the inefficient defect of repetitive process.By simulation, switch effect, search out the handoff parameter being suitable in different motion direction, under different motion speed.

For achieving the above object, design the optimization method of the handoff parameter on a kind of network route, the method comprises the following steps:

A, input basic data:

Import drive test data, obtain the signal distributions on route, data comprise time, longitude and latitude, main plot frequency, main plot scrambler, main plot PCCPCH RSCP, main plot PCCPCH C/I, adjacent cell frequency, adjacent cell scrambler, adjacent cell PCCPCH RSCP, switching point position, and original drive test data can carry out drive test according to movement velocity minimum on Ci Duan road;

B, simulation reported data:

From the drive test data of low speed, can sample and obtain different motion speed at a high speed, the signal distributions of the drive test point in different motion direction, the filtering parameter of reading system, calculate the filtered PCCPCH RSCP of each point, the filtered data that report of each point under simulation different motion speed

Filtering Formula:

F _n=(1-a)·F _n-1+a·M _n

F wherein _nfor current filtered measurement result;

F _n-1for front once filtered measurement result;

M _nfor this measurement result;

A=1/2 (k/2), k is Filter Coefficient, from system parameters, reads;

C, simulation handoff procedure:

According to 1g or 2a event, judge whether to meet switching condition;

Described 1g event is

10·LogM _i+O _i-H _1g＞10·LogM _{previous_best}+O _{previous_best}，

M _ifor the P-CCPCH RSCP of Target cell, the mW of unit,

O _ifor the signal of Target cell is offset to,

H _1gfor event 1g Steinmetz's constant,

M _{previous_best}for current area P-CCPCH RSCP, the mW of unit,

O _{previous_best}for the signal biasing of current area,

When the continuous T ime_to_trigger_1g time, meet above-mentioned 1g condition, report 1g event;

Described 2a event is

Q _NotBest≥Q _Best+H _2a/2

Q _notBestfor before carrying out reporting events, non-optimum frequency Signal estimation value,

Q _bestfor before carrying out reporting events, optimum frequency Signal estimation value,

H _2afor event 2a Steinmetz's constant,

When the continuous T ime_to_trigger_2a time, meet above-mentioned 2a condition, report 2a event;

D, corrected parameter:

Owing to reporting 1g or 2a event, when system is carried out, need free, therefore need the difference that put the switching time of comparative simulation and put actual switching time, and revise some switching time of each community, and record respectively in 1g or 2a event switching type: RNC with frequently switching, in RNC, alien frequencies switches, between RNC, with frequency, switch, between RNC, alien frequencies switches, due to according to measured data, each community only has a kind of switching type, and after handoff parameter change, the switching type of each community may change, therefore need to find the similar community of wireless environment with clustering algorithm, according to similar community, configure the switching time of implementation under the different switching types in current area,

E, location, problem cells:

To the problem cells of finding, according to the order of severity of problem, select a problem cells, the seriousness of problem is larger, and the probability of being chosen is just larger,

Described problem cells is defined as follows:

A. pingpang handoff community: a-> > b has occurred in very short time time1, the switching of b-> > a;

B. switch too early or spend evening or handoff failure causes PCCPCH RSCP < Tareget1 or PCCPCH C/I < Target2 phenomenon;

C. because switching value sluggishness is too large or switching time is sluggish too large, cause a to be switched to after b, after master control very short time of b, from b, be switched to c community;

D. because switching value sluggishness is too little or switching time is sluggish little, cause the community that is switched to the non-direction of motion to be got on;

F, search handoff parameter:

With Genetic algorithm searching, to handoff parameter, guarantee to use after new handoff parameter good than before optimizing of PCCPCH RSCP and PCCPCH C/I in multi-motion speed, different motion direction, there is no pingpang handoff in the situation that.

Compared with prior art, its advantage is in the present invention: carry out fast road optimization, local optimum and combination thereof and optimize, increase work efficiency; Switching effect in Fast simulation different motion speed, different motion direction, under each handoff parameter, without drive test repeatedly, shortens the optimization time, reduces workload; Equilibrium has considered to have searched adjacent area, to relating to the parameter of neighboring interval switching, carries out autobalance, guarantees effect of optimization; Handoff parameter automatic optimization method full automation operation, and with planning software close fit, reduced in network optimization process " drive test → assessment → drive test ... " the time of cyclic process and cost.

[accompanying drawing explanation]

Fig. 1 is flow chart of the present invention;

Fig. 2 is that the present invention simulates switching flow figure;

[embodiment]

By reference to the accompanying drawings, the present invention will be further described, and this manufacturing technology is clearly to this professional person.

Referring to Fig. 1, flow process of the present invention is as follows:

1, input basic data:

Import drive test data, obtain the signal distributions on route.Data comprise time, longitude and latitude, main plot frequency, main plot scrambler, main plot PCCPCH RSCP, main plot PCCPCH C/I, adjacent cell frequency, adjacent cell scrambler, adjacent cell PCCPCH RSCP, switching point position.

Original drive test data can carry out drive test according to movement velocity minimum on Ci Duan road.

2, simulation reported data

From the drive test data of low speed, can sample and obtain different motion speed at a high speed, the signal distributions of the drive test point in different motion direction.

The filtering parameter of reading system, calculates the filtered PCCPCH RSCP of each point, the filtered data that report of each point under simulation different motion speed

Filtering Formula:

F _n=(1-a)·F _n-1+a·M _n

Fn is current filtered measurement result,

Fn-1 is front once filtered measurement result;

Mn is this measurement result;

A=1/2 (k/2) wherein, K is Filter Coefficient, from system parameters, reads

3, simulation handoff procedure, referring to Fig. 2

According to 1g or 2a event, judge whether to meet switching condition.

1g event:

10·LogM _i+O _i-H _1g＞10·LogM _{previous_best}+O _{previous_best}，

The continuous T ime_ to_ trigger_1g time meets above-mentioned condition, reports 1g event

Mprevious_best: current area P-CCPCH RSCP, the mW of unit.

Oprevious_best: the signal biasing of current area.

Mi: the P-CCPCH RSCP of Target cell, the mW of unit.

Oi: the signal biasing of Target cell.

H1g: event 1G Steinmetz's constant.

2a event:

Q _NotBest≥Q _Best+H _2a/2

The ime_ to_ trigger_2a time meets above-mentioned condition continuously, reports 2a event

QNot Best: before carrying out reporting events, non-optimum frequency Signal estimation value.

QBest: before carrying out reporting events, optimum frequency Signal estimation value.

H2a: event 2A Steinmetz's constant.

4, corrected parameter

Owing to reporting 1g or 2a event, when system is carried out, need free.Therefore need the difference that put the switching time of comparative simulation and put actual switching time, and revise some switching time of each community.And it is interior with switching with alien frequencies between frequency switching, RNC between alien frequencies switching, RNC in frequency switching, RNC to record respectively its switching type: RNC.Due to according to measured data, each community only has a kind of switching type and after handoff parameter changes, the switching type of each community may change.Therefore need to find the similar community of wireless environment with clustering algorithm, configure the switching time of implementation under the different switching types in current area according to similar community.

5, location, problem cells

To the problem cells of finding, according to the order of severity of problem, select a problem cells (seriousness of problem is larger, and the probability of being chosen is just larger)

Problem cells definition:

A, pingpang handoff community: a-> > b has occurred in very short time time1, the switching of b-> > a

B, switch too early or spend evening or handoff failure causes PCCPCH RSCP < Tareget1 or PCCPCH C/I < Target2 phenomenon

C, because switching value sluggishness is too large or switching time is sluggish too large, cause a to be switched to after b, after master control very short time of b, from b, be switched to c community

D, because switching value sluggishness is too little or switching time is sluggish little, cause the community that is switched to the non-direction of motion to be got on

6, search handoff parameter

With Genetic algorithm searching, to handoff parameter, guarantee to use after new handoff parameter good than before optimizing of PCCPCH RSCP and PCCPCH C/I in multi-motion speed, different motion direction, there is no pingpang handoff in the situation that.

Claims (1)

1. an optimization method for the handoff parameter on network route, the method comprises the following steps:

A, input basic data:

Import drive test data, obtain the signal distributions on route, data comprise time, longitude and latitude, main plot frequency, main plot scrambler, main plot PCCPCH RSCP, main plot PCCPCH C/I, adjacent cell frequency, adjacent cell scrambler, adjacent cell PCCPCH RSCP, switching point position, and original drive test data carrys out drive test according to movement velocity minimum on Ci Duan road;

B, simulation reported data:

From the drive test data of low speed, sampling obtains different motion speed at a high speed, the signal distributions of the drive test point in different motion direction, the filtering parameter of reading system, calculate the filtered PCCPCH RSCP of each point, the filtered data that report of each point under simulation different motion speed, Filtering Formula:

F _n＝(1-a)·F _n-1+a·M _n

F wherein _nfor current filtered measurement result;

F _n-1for front once filtered measurement result;

M _nfor this measurement result;

A=1/2 (k/2), k is filter coefficient, from system parameters, reads;

C, simulation handoff procedure:

According to 1g or 2a event, judge whether to meet switching condition;

Described 1g event is

10·LogM _i+O _i-H _1g＞10·LogM _{previous_best}+O _{previous_best},

M _ifor the P-CCPCH RSCP of Target cell, the mW of unit,

O _ifor the signal biasing of Target cell,

H _1gfor event 1g Steinmetz's constant,

M _{previous_best}for current area P-CCPCHRSCP, the mW of unit,

O _{previous_best}for the signal biasing of current area,

When the continuous T ime_to_trigger_1g time, meet above-mentioned 1g condition, report 1g event;

Described 2a event is

Q _NotBest≥Q _Best+H _2a/2

Q _notBestfor before carrying out reporting events, non-optimum frequency Signal estimation value,

Q _bestfor before carrying out reporting events, optimum frequency Signal estimation value,

H _2afor event 2a Steinmetz's constant,

When the continuous T ime_to_trigger_2a time, meet above-mentioned 2a condition, report 2a event;

D, corrected parameter:

Owing to reporting 1g or 2a event, when system is carried out, need free, therefore need the difference that put the switching time of comparative simulation and put actual switching time, and revise some switching time of each community, and record respectively in 1g or 2a event switching type: RNC with frequently switching, in RNC, alien frequencies switches, between RNC, with frequency, switch, between RNC, alien frequencies switches, due to according to measured data, each community only has a kind of switching type, and after handoff parameter change, therefore may changing, the switching type of each community need to find the similar community of wireless environment with clustering algorithm, according to similar community, configure the switching time of implementation under the different switching types in current area,

E, location, problem cells:

To the problem cells of finding, according to the order of severity of problem, select a problem cells, the seriousness of problem is larger, and the probability of being chosen is just larger,

Described problem cells is defined as follows:

A. pingpang handoff community: a-> > b has occurred in very short time time1, the switching of b-> > a;

B. switch too early or spend evening or handoff failure causes PCCPCHRSCP < Tareget1 or PCCPCHC/I < Target2 phenomenon;

C. because switching value sluggishness is too large or switching time is sluggish too large, cause a to be switched to after b, after master control very short time of b, from b, be switched to c community;

D. because switching value sluggishness is too little or switching time is sluggish little, cause the community that is switched to the non-direction of motion to be got on;

F, search handoff parameter:

With Genetic algorithm searching, to handoff parameter, guarantee to use after new handoff parameter good than before optimizing of PCCPCH RSCP and PCCPCH C/I in multi-motion speed, different motion direction, there is no pingpang handoff in the situation that.