CN103096334B - Determine the method and device on cell extension biasing border - Google Patents

Abstract

The present invention discloses a kind of method and device determining cell extension biasing border, relate to communication technical field, according to the first base station, dividing value on different CRE bias is set according to the second different base stations, such that it is able to improve the UE quantity being unloaded to the second base station, and reduces UE cutting off rate.The present invention is by adding up the SINR of subscriber equipment in the second base station range, and determine a SINR, then calculate the upper dividing value of cell extension biasing of the second base station according to a SINR, the cell extension of the second base station is biased upper dividing value and is sent to the first base station or network management system.The scheme that the embodiment of the present invention provides is suitable for determining the employing on cell extension biasing border.

Description

Determine the method and device on cell extension biasing border

Technical field

The present invention relates to communication technical field, particularly relate to a kind of method and device determining cell extension biasing border.

Background technology

In a wireless communication system, use heterogeneous network to carry out the transmission of data, LTE (Longterm can be promoted Evolution, Long Term Evolution) and/or LTE-A (Advanced long term evolution, advanced Long Term Evolution) Performance requirement.Heterogeneous network is to dispose the dissimilar or base station of different systems in homogeneous network, can strengthen covering of network Lid and performance.

In order to improve the spectrum utilization efficiency of system, promote network capacity, by adjusting Microcell in heterogeneous network CRE bias (Cell Range Expansion bias, cell extension biases) value, it is achieved community in macrocell, the Microcell Cover extension, with in the UE in further unloading macrocell to Microcell, thus reduce the load of macrocell.Microcell employs After cell coverage expansion, macro base station can produce severe jamming to the UE in the extended area of Microcell, for solving interference problem, 3GPP (The 3rd Generation PartnershipProject, third generation partner program) introduces the EICIC of time domain (Enhancement of theInter-Cell interference Coordination, Inter-Cell Interference Coordination is competed) does Disturbing coordination system AB S (almost blank subframe, almost empty frame), ABS may be used for PDCCH (Physical Downlinkcontrol channel, Physical Downlink Control Channel) disturb and stagger, thus when solving the mixed deployment of size base station Control channel interference problem.

But, in prior art, the Microcell (the second base station) in coverage is used unified by macro base station (the first base station) The scheme of configuration CRE bias value so that the UE (User of the second base station can be unloaded to when CRE bias value is less Equipment, subscriber equipment) less, when CRE bias value is bigger, UE call drop is more.

Summary of the invention

Embodiments of the invention provide a kind of method and device determining cell extension biasing border so that the first base station root According to the second different base stations, dividing value on different CRE bias is set, such that it is able to improve the UE quantity being unloaded to the second base station, And reduce UE cutting off rate.

For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that

A kind of method determining cell extension biasing border, including:

Second base station obtains the upper dividing value of cell extension biasing, and upper for the biasing of described cell extension dividing value is sent to the first base Stand or network management system, in order to described first base station or described network management system are arranged according to the upper dividing value of described cell extension biasing The extension bias of described second base station.

A kind of device determining cell extension biasing border, it is characterised in that including:

Transmitting element, is used for obtaining the upper dividing value of cell extension biasing, and is sent to by upper for the biasing of described cell extension dividing value First base station or network management system, in order to described first base station or described network management system bias the upper bound according to described cell extension Value arranges the extension bias of described second base station.

A kind of method and device determining cell extension biasing border that the embodiment of the present invention provides, expands by obtaining community The upper dividing value of exhibition biasing, and upper for the biasing of described cell extension dividing value is sent to the first base station or network management system, in order to described the One base station or network management system arrange the extension bias of described second base station according to the upper dividing value of described cell extension biasing.With existing There is macro base station in technology (the first base station) that the Microcell (the second base station) in coverage uses unified configuration cell extension inclined Put the scheme of CRE bias value so that the UE (User of the second base station can be unloaded to when CREbias value is less Equipment, subscriber equipment) less, when CRE bias value is bigger, UE call drop is more compares, the side that the embodiment of the present invention provides Case, the first base station arranges dividing value on different CRE bias according to the second different base stations, is unloaded to second such that it is able to improve The UE quantity of base station, and reduce UE cutting off rate.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used To obtain other accompanying drawing according to these accompanying drawings.

The flow chart of a kind of method determining cell extension biasing border that Fig. 1 provides for the embodiment of the present invention 1；

The block diagram of a kind of device determining cell extension biasing border that Fig. 2 provides for the embodiment of the present invention 1；

The flow chart of a kind of method determining cell extension biasing border that Fig. 3 provides for the embodiment of the present invention 2；

The first base station that Fig. 4 provides for the embodiment of the present invention 2 and the schematic diagram of the network scenarios of the second base station mixed networking；

The schematic diagram that the second base station maximum CRE that Fig. 5 provides for the embodiment of the present invention 2 covers；

The block diagram of a kind of device determining cell extension biasing border that Fig. 6 provides for the embodiment of the present invention 2；

The signal of the cell extension biasing border list that different ABS power that Fig. 7 provides for the embodiment of the present invention 2 are corresponding Figure；

The cell extension biasing border column that the different carrier that Fig. 8 provides for the embodiment of the present invention 2, different ABS power are corresponding The schematic diagram of table.

Detailed description of the invention

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 carried out clear, complete Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.

Embodiment 1

The embodiment of the present invention provides a kind of method determining cell extension biasing border, as it is shown in figure 1, the method includes:

Second base station obtains the upper dividing value of cell extension biasing, and upper for the biasing of described cell extension dividing value is sent to the first base Stand or network management system, in order to described first base station or described network management system are arranged according to the upper dividing value of described cell extension biasing The extension bias of described second base station；Wherein, the second base station obtains the method on cell extension biasing border, specifically includes:

Step 101, adds up the SINR of subscriber equipment in the second base station range, and determines a SINR；

It should be noted that the first base station arranges the initial CRE bias value of the second base station, then according to described initial CRE Bias value and the described SINR of statistics, determine a SINR.

SINR (Signal to Interference plus Noise Ratio, Signal to Interference plus Noise Ratio), is to connect The ratio of the intensity of the useful signal received and the intensity of the interference signal (noise and interference) received；Can simply understand For " Signal to Interference plus Noise Ratio ".

A described SINR is in Preset Time in described second base station range of statistics described in subscriber equipment The meansigma methods of the minimum SINR of predetermined number in SINR；Or,

A described SINR is in Preset Time in described second base station range of statistics described in subscriber equipment After SINR arranges in descending order, the minimum SINR in the SINR of preset ratio or predetermined number in described SINR.

Step 102, calculates the upper dividing value of cell extension biasing of described second base station according to a described SINR；

Specifically, determine that described second base station carries out the ultimate range of cell extension according to target SINR；According to described little The ultimate range of district's extension and a described SINR, calculate the upper dividing value of cell extension biasing of described second base station；

On described CRE bias dividing value be the SINR of each point on described CRE coverage inward flange position be target SINR Time corresponding CRE bias value in minima in maximum so that described second base station adjusts dividing value on described CRE bias and unloads Time in load macro base station in UE to second base station, the described SINR that described second base station provides meets described UE decoding and controls letter Described target SINR required by road.

Step 103, biases the cell extension of described second base station upper dividing value and is sent to described first base station or described Network management system, in order to the first base station or described network management system arrange described second base station according to the described upper dividing value of extension biasing Extension bias；

Further, by X 2 interface between base stations, upper for the biasing of described cell extension dividing value is sent to described first base station； Or, with network management system interface, upper for the biasing of described cell extension dividing value is sent to described network management system by base station.

Optionally, the described second base station cell extension that almost empty frame ABS power is corresponding by difference biasing upper dividing value row Table is sent to described first base station by X 2 interface between base stations；Or, described second base station is by community corresponding for different ABS power Extension biasing upper bound value list is sent to described network management system by base station and network management system interface；

Optionally, under multicarrier scene, described second base station by under different carrier, community that different ABS power is corresponding Extension biasing upper bound value list is sent to described first base station by X 2 interface between base stations；Or, described second base station is by difference Under carrier wave, cell extension biasing upper bound value list that different ABS power is corresponding be sent to institute by base station and network management system interface State network management system.

A kind of method determining cell extension biasing border that the embodiment of the present invention provides, covers by adding up the second base station In the range of the SINR of UE, and determine a SINR, then calculate the CRE bias of described second base station according to a described SINR Upper dividing value, is sent to the first base station or network management system by dividing value on the CRE bias of described second base station.With in prior art First base station uses the scheme of unified configuration CRE bias value to the second base station in coverage so that when CRE bias value relatively The UE that hour can be unloaded to the second base station is less, and when CRE bias value is bigger, UE call drop is more compares, the embodiment of the present invention The scheme provided, the first base station arranges dividing value on different CRE bias according to the second different base stations, unloads such that it is able to improve It is downloaded to the UE quantity of the second base station, and reduces UE cutting off rate.

The embodiment of the present invention provides a kind of device determining cell extension biasing border, as in figure 2 it is shown, the method includes: Transmitting element 200, first determines subelement 201, computation subunit 202, sends subelement 203.

Transmitting element 200, is used for obtaining the upper dividing value of cell extension biasing, and is sent by upper for the biasing of described cell extension dividing value To the first base station or network management system, in order to described first base station or described network management system bias according to described cell extension Dividing value arranges the extension bias of described second base station；

Wherein, described transmitting element 200 includes:

First determines subelement 201, the Signal to Interference plus Noise Ratio SINR of subscriber equipment in statistics the second base station range, and Determine a SINR；

According to a described SINR, computation subunit 202 calculates the upper dividing value of cell extension biasing of described second base station；Send out Sending subelement 203, being sent to described first base station or described for the cell extension of described second base station being biased upper dividing value Network management system, in order to the first base station or described network management system arrange described second base station according to the described upper dividing value of extension biasing Extension bias.

A described SINR is in Preset Time in described second base station range of statistics described in subscriber equipment The meansigma methods of the minimum SINR of predetermined number in SINR；Or,

A described SINR is in Preset Time in described second base station range of statistics described in subscriber equipment After SINR arranges in descending order, the minimum SINR in the SINR of preset ratio or predetermined number in described SINR.

By first, a kind of device determining cell extension biasing border that the embodiment of the present invention provides, determines that unit determines Oneth SINR, the upper dividing value of cell extension biasing that then computing unit calculates described second base station according to a described SINR, send out Send unit that the cell extension of described second base station biases upper dividing value and be sent to the first base station or network management system.With prior art In the first base station the second base station in coverage is used the scheme of unified configuration CRE bias value so that when CRE bias value The UE that can be unloaded to the second base station time less is less, and when CRE bias value is bigger, UE call drop is more compares, and the present invention implements The scheme that example provides, the first base station arranges dividing value on different CRE bias according to the second different base stations, such that it is able to improve It is unloaded to the UE quantity of the second base station, and reduces UE cutting off rate.

Embodiment 2

The embodiment of the present invention provides a kind of method determining cell extension biasing border, as it is shown on figure 3, the method is mainly wrapped Include: the second base station obtains the cell extension biasing upper dividing value of CRE bias, and the biasing of described cell extension is gone up dividing value be sent to the One base station or network management system, in order to described first base station or described network management system are according to the upper dividing value of described cell extension biasing The extension bias of described second base station is set；

On CRE bias, dividing value is the determination cell extension biasing limit provided by the embodiment of the present invention according to the second base station The method on boundary determines, specifically determines that the method on cell extension biasing border includes:

It should be noted that the network scenarios of first base station of the present invention and the second base station mixed networking is as shown in Figure 4, figure In be made up of 7 the first base stations and 1 the second base station, have two circles representing coverages, wherein, real circle around the second base station Represent that the coverage before not having CRE extension, empty circle represent the coverage after CRE extends.If UEi is positioned at real circle limit Edge, and be on the straight line that the first base station 1 is connected with the first base station 3, A point is positioned at empty circle edge, and is in the first base station 1 He On the straight line that first base station 3 is connected.If the distance between the second base station and the first base station 1 is d_mp.UEi to first base station 1 Distance isPath loss isThe distance of UEi to first base station 3 isDistance to neighbouring second base station is Path loss isThe station spacing of the first base station is D_m.The transmitting power of the first base station is P_m, the transmitting power of the second base station is P_p；

It addition, Metric 1 is the second base station when adjusting in CRE bias value unloading Macro UE to second base station, need the Diyl stands in the SINR provided for this UE on ABS and meets the UE decoding control minimum SINR required by channel, here, minimum SINR For target SINR, for γ_min.Maximum CRE when second base station meets Metric 1 covers edge as indicated by the dashed lines, if A point arrives UEⁱTo distance be Δ d, the distance to the first base station 1 is d_mi, path loss is L_mi(dB), the distance to the first base station 3 isArrive The distance of neighbouring second base station is d_pi, path loss is L_pi, then

$d_{\mathrm{mi}}=d_{\mathrm{mi}}^0+\mathrm{\Δd}---\left(1\right)$

$d_{\mathrm{pi}}=d_{\mathrm{pi}}^0+\mathrm{\Δd}---\left(2\right)$

${\tilde{d}}_{\mathrm{mi}}^0=D_m-d_{\mathrm{mi}}^0---\left(3\right)$

${\tilde{d}}_{\mathrm{mi}}={\tilde{d}}_{\mathrm{mi}}^0-\mathrm{\Δd}---\left(4\right)$

First, the first base station arranges the initial cell extension biasing CRE bias value of the second base station；Illustrate, the first base It can be δ that station arranges the described initial CRE bias value of the second base station₀。

Step 301, described second base station works in class empty frame ABS subframe in adding up described second base station range The Signal to Interference plus Noise Ratio SINR of user equipment (UE), and determine a SINR according to initial cell extension biasing CRE bias value；

It is unloaded in the second base station by the adjustment of the second base station CRE Bias it should be noted that set UEi, is meeting On the premise of Metric 1, the second base station is set to δ to the maximum CRE bias value of UEi_{I, max}, then UEi will be dispatched in this second base station In ABS subframe, ABS sub frame power is P_ABS, then the interference come from the first base station 1ABS subframe is I_mi=P_ABS-L_mi, this In, L_miPath loss for A point to the first base station 1；It addition, the interference coming from other communities is set to I_i, then UEi is in the second base station Be subject to during scheduling in ABS subframe always disturbs I_{I, Total}For:

$I_{i,\mathrm{Total}}=10\log ({10}^{I_{\mathrm{mi}}/10}+{10}^{I_i/10})....5$

P_p-L_Pi+δ_{I, max}≥P_m-L_mi ····6

P_p-L_Pi-I_{I, Total}≥γ_min ····7

Here, when the second base station CRE covers edge customer, then (7) take equal sign, i.e. P_p-L_Pi-I_{I, Total}=γ_min,

UEi is when the second base station CRE covers edge, formula (5)-(7) and (7) when taking equal sign, it is possible to obtain the second base Stand to this UE maximum CRE Bias and be:

${\mathrm{\δ}}_{i,\max }=P_m-L_{\mathrm{mi}}-(P_p-L_{\mathrm{pi}})$

$=P_m-L_{\mathrm{mi}}-(I_{\mathrm{Total}}+{\mathrm{\γ}}_{\min })$

$=P_m-L_{\mathrm{mi}}-[10{\log }_{10}({10}^{I_{\mathrm{mi}}/10}+{10}^{I_i/10})+{\mathrm{\γ}}_{\min }....8$

$=P_m-(10{\log }_{10}{10}^{L_{\mathrm{mi}}/10}+10{\log }_{10}({10}^{(P_{\mathrm{ABS}}-L_{\mathrm{mi}})/10}+{10}^{I_i/10})-{\mathrm{\γ}}_{\min }$

$=P_m-10{\log }_{10}({10}^{P_{\mathrm{ABS}}/10}+{10}^{(L_{\mathrm{mi}}+I_i)/10})-{\mathrm{\γ}}_{\min })$

The SINR of UEi can be obtained according to formula (8), in the second base station statistics coverage, work in UE in ABS subframe SINR:

${\mathrm{\γ}}_0=P_m-10{\log }_{10}({10}^{P_{\mathrm{ABS}}/10}+{10}^{(L_{\mathrm{mi}}^0+I_i^0)/10})-{\mathrm{\δ}}_0---\left(9\right)$

WhereinRSRP (Reference Signal Received Power, the reference can measured according to UEi Signal receive power) result carry out estimate obtain, then the SINR of UEi can according to (9) calculate obtain.

If it should be noted that the second base station maximum CRE covers as it is shown in figure 5, UE is in the position of UE1, then

d_m1=d_mp-d_p1 (10)

If UE is in UE2 position, then

d_m2=d_mp+d_p2 (11)

If UE is between UE1 and UE2, and it is in other positions arbitrary in addition to UE1 and UE2 at CRE covering edge When putting, such as UE3 present position, then

d_mp-d_p1＜ d_mi＜ d_mp+d_p2 (12)

So L_m1≤L_mi≤L_m2 (13)

From (9) (13), to arbitrary second base station, its CRE covers the UE on edge to its Serving cell the first base station 1 Path loss (distance) L_miWhen becoming big, the interference I of the first base station, adjacent area that it is subject to_iAlso become big, cause CRE bias value to reduce, i.e.

δ_{2, max}≤δ_{I, max}≤δ_{1, max} (14)

From (14), to arbitrary second base station, it is target when its CRE covers the SINR of the UE of any position on edge SINR, i.e. SINR are γ_minTime, CRE bias value corresponding to each position is different, and the second base station CRE covers edge The maximum of upper CRE bias occurs in the most proximal end apart from the first base station, its serving macro-cell 1, and CRE covers CRE on edge The minima of bias occurs in the distalmost end apart from the first base station, its serving macro-cell 1.So, the present invention uses δ_{2, max}As The CRE bias maximum of two base stations, dividing value δ on the i.e. second base station CRE bias_max=δ_{2, max}。

It should be noted that use δ_{2, max}The CRE making the second base station is covered by the CRE bias maximum as the second base station Lid reduces in addition to UE2 location point the most accordingly, but can ensure that all UE being unloaded in the second base station meet minimum SINR and want Ask, and the minimum SINR of UE is in the distalmost end of distance the first base station 1, i.e. UE2 present position.So, according to above-mentioned conclusion, when When UEi is in position shown in Fig. 4, its SINR is minimum.

It addition, a described SINR is subscriber equipment in described second base station range added up in Preset Time The meansigma methods of the minimum SINR of predetermined number in described SINR.Illustrate, within a period of time, described second base station of statistics In coverage, the described SINR of subscriber equipment is 100, can be by 10 described SINR by order arrangement from small to large, so After take the 1st SINR to the 5th SINR, then calculate the meansigma methods of these 5 minimum SINR, 5 the minimum SINR's calculated is flat Average is a SINR.Here, predetermined number can determine as required；

Or, a described SINR is subscriber equipment in described second base station range added up in Preset Time After described SINR arranges in descending order, the minimum SINR in the SINR of preset ratio or predetermined number in described SINR.Citing Illustrating, within a period of time, in described second base station range of statistics, the described SINR of subscriber equipment is 100, by this 100 SINR carry out descending, then take the SINR of 95% in 100 SINR after sequence being arranged, i.e. preset ratio is permissible Being 95%, predetermined number can be 95, takes 95 SINR, removes worst 5 SINR, and SINR minimum in 95 SINR is i.e. It is a SINR.Here, preset ratio and predetermined number can determine as required；

Step 302, described second base station according to target SINR determine described second base station carry out the maximum of CRE extension away from From；

It is appreciated that according to step 301 UE with minimum SINR is in the position of UEi in Fig. 4, in UEi is in Fig. 4 A point position time, then

${\mathrm{\γ}}_{\min }=P_p-L_{\mathrm{pi}}-I_{i,\mathrm{Total}}$

$=P_p-L_{\mathrm{pi}}-10{\log }_{10}({10}^{I_{\mathrm{mi}}/10}+{10}^{I_i/10})....15$

$=P_p-(140.7+36.7{\log }_{10}(d_{\mathrm{pi}}^0+\mathrm{\Δd}))-10{\log }_{10}({10}^{(P_{\mathrm{ABS}}-(128.1+37.6\log (d_{\mathrm{mi}}^0+\mathrm{\Δd})))/10}+{10}^{[P_I-(128.1+37.6\log (500-d_{\mathrm{mi}}^0-\mathrm{\Δd}))]/10})$

It should be noted that according to step 302 estimatesValue is it is estimated that corresponding Value, P_IFor under macrocell maximum interference power scene, the transmitting power of artificial interferers base station, wherein, when the first base station 2 and the first base Standing and 4 be deployed in the first position, base station 3 equally, the second base station is in again the meta of the straight line that the first base station 1 is connected with the first base station 3 Putting, the maximum interference that now the second base station is subject to is maximum scene.Now

$P_I=10{\log }_{10}(3\×{10}^{P_m/10})....16$

When according to maximum interference scene, and the minimum SINR of UE is γ_minTime, calculate according to formula (15) and formula (16) Obtain the second base station CRE and cover the extended range Δ d of Edge Distance the first base station distalmost end_max, i.e. may determine that described second base Station carries out the ultimate range of CRE extension

Step 303, described second base station, according to described ultimate range and the described SINR determined, calculates described second Dividing value on the CRE bias of base station；

The ultimate range Δ d obtained is calculated according to step 302_max, can draw according to formula (8),

${\mathrm{\γ}}_{\min }=P_m-10{\log }_{10}({10}^{P_{\mathrm{ABS}}/10}+{10}^{(L_{\mathrm{mi}}+I_i)/10})-{\mathrm{\δ}}_{\max }$

$=P_m-10{\log }_{10}({10}^{P_{\mathrm{ABS}}/10}+{10}^{((128.1+37.6{\log }_{10}(d_{\mathrm{mi}}^0+{\mathrm{\Δd}}_{\max }))+P_I-(128.1+37.6{\log }_{10}(500-d_{\mathrm{mi}}^0-{\mathrm{\Δd}}_{\max })))/10})-{\mathrm{\δ}}_{\max }....17$

Being obtained dividing value on the CRE bias of described second base station by formula (9) and formula (17) is:

${\mathrm{\δ}}_{\max }={\mathrm{\γ}}_0-{\mathrm{\γ}}_{\min }+{\mathrm{\δ}}_0-10{\log }_{10}\frac{1+{10}^{(L_{\mathrm{mi}}+I_i-P_{\mathrm{ABS}})/10}}{1+{10}^{(L_{\mathrm{mi}}^0+I_i^0-P_{\mathrm{ABS}})/10}}$

$={\mathrm{\γ}}_0-{\mathrm{\γ}}_{\min }+{\mathrm{\δ}}_0-10{\log }_{10}\frac{1+{10}^{(128.1+37.6{\log }_{10}(d_{\mathrm{mi}}^0+{\mathrm{\Δd}}_{\max })+[P_I-128.1-37.6{\log }_{10}(500-d_{\mathrm{mi}}^0-{\mathrm{\Δd}}_{\max })]-P_{\mathrm{ABS}})/10}}{1+{10}^{(L_{\mathrm{mi}}^0+I_i^0-P_{\mathrm{ABS}})/10}}....18$

$={\mathrm{\γ}}_0-{\mathrm{\γ}}_{\min }+{\mathrm{\δ}}_0-\mathrm{\Φ}$

Wherein, $\mathrm{\Φ}=10{\log }_{10}\frac{1+{10}^{(128.1+37.6{\log }_{10}(d_{\mathrm{mi}}^0+{\mathrm{\Δd}}_{\max })+[P_I-128.1-37.6{\log }_{10}(500-d_{\mathrm{mi}}^0-{\mathrm{\Δd}}_{\max })]-P_{\mathrm{ABS}})/10}}{1+{10}^{(L_{\mathrm{mi}}^0+I_i^0-P_{\mathrm{ABS}})/10}}$

Owing to the Δ d in formula (18) is to be calculated acquisition, the δ of estimation under maximum interference scene by (15)_maxIt is individual conservative Value, it is ensured that the CRE of the second base station will not hyper expanded, cause the UE being unloaded in the second base station will not produce Special Handle of Drop Question.

In addition, it is necessary to explanation, on described CRE bias, dividing value is each on described CRE coverage inward flange position Minima in maximum in the CRE bias value of point, so that described second base station adjusts dividing value on described CREbias and unloads grand Time in base station in UE to second base station, the described SINR that described second base station provides meets described UE decoding and controls channel institute Described target SINR required.

Step 304, biases the cell extension of described second base station upper dividing value and is sent to described first base station or described Network management system, in order to the first base station or described network management system arrange described second base station according to the described upper dividing value of extension biasing Extension bias, and extend the MPS process of described second base station.

Specifically, by key-course interface X2 mouth between base station, dividing value on described CRE bias is sent to the first base station；Or Person, is sent to described network management system with network management system interface by upper for the biasing of described cell extension dividing value by base station.

Optionally, the described second base station cell extension that almost empty frame ABS power is corresponding by difference biasing upper dividing value row Table is sent to described first base station by X 2 interface between base stations；Or, described second base station is by community corresponding for different ABS power Extension biasing upper bound value list is sent to described network management system by base station and network management system interface.As it is shown in fig. 7, when ABS merit When rate is 0W, the upper dividing value of cell extension biasing is 11dB；When ABS power is 1W, the upper dividing value of cell extension biasing is 10dB；When When ABS power is 4W, the upper dividing value of cell extension biasing is 8dB, cell extension as shown in Figure 7 is biased upper bound value list and sends To the first base station or network management system；

Optionally, under multicarrier scene, described second base station by under different carrier, community that different ABS power is corresponding Extension biasing upper bound value list is sent to described first base station by X 2 interface between base stations；Or, described second base station is by difference Under carrier wave, cell extension biasing upper bound value list that different ABS power is corresponding be sent to institute by base station and network management system interface State network management system.As shown in Figure 8, when 1 carrier wave, when ABS power is 0W, the upper dividing value of cell extension biasing is 11dB, ABS merit When rate is 1W, the upper dividing value of cell extension biasing is 10dB, ABS power when being 4W, and the upper dividing value of cell extension biasing is 8dB；When 2 During carrier wave, when ABS power is 0W, the upper dividing value of cell extension biasing is 11dB, ABS power when being 0.5W, in cell extension biasing Dividing value is 10.5dB, ABS power when being 2W, and the upper dividing value of cell extension biasing is 9dB, cell extension is as shown in Figure 8 biased Upper bound value list is sent to the first base station or network management system.

Then calculate dividing value on the CRE bias obtained according to step 304, the CRE carrying out the second base station range expands Exhibition.

Step 305, described second base station works in the SINR of the UE in ABS subframe in adding up described CRE coverage, and Determine the 2nd SINR；

According to the method for step 301, determine the 2nd SINR, if described 2nd SINR is γ '₀。

It should be noted that the determination method of the 2nd SINR is identical with the computational methods of the SINR in step 301, tool Body can refer to the computational methods of a SINR.

Step 306, described second base station, according to a described SINR and described 2nd SINR, determines on maximum CREbias Dividing value.

Specifically, as γ '₀-γ_minDuring ＜ ε, determine that on described CRE bias, dividing value is dividing value on maximum CRE bias, its In, γ '₀For described 2nd SINR, γ_minFor described minimum SINR, the most described target SINR, ε is predetermined threshold value；

As γ '₀-γ_minDuring >=ε, determine δ₀=δ_max, γ₀=γ '₀, and according to determining cell coverage expansion bias border Method recalculate dividing value on CRE bias, i.e. repeated execution of steps 303-step 307；Wherein, δ₀For described initial CRE Bias value, δ_maxFor dividing value, γ on described CRE bias₀For a described SINR.

The rest may be inferred, until the minimum that the SINR of the UE worked in the second base station range in ABS subframe meets Till SINR requires, and time according to this, the minimum SINR of UE determines dividing value on final CRE bias.

The embodiment of the present invention provides a kind of method determining cell extension biasing border, covers model by adding up the second base station Work in the SINR of UE in ABS subframe in enclosing, and determine a SINR according to initial CRE bias value, then according to described One SINR calculates dividing value on the CRE bias of described second base station, and the CRE extending described second base station covers, and statistics is described Work in the SINR of UE in ABS subframe in CRE coverage, and determine the 2nd SINR；According to a described SINR and described 2nd SINR, determines dividing value on maximum CRE bias.With prior art, the second base station in the first base station range is adopted Scheme by unified configuration CREbias value so that the UE that can be unloaded to the second base station when CRE bias value is less is less, when When CRE bias value is bigger, UE call drop is more compares, and the scheme that the embodiment of the present invention provides, the first base station is according to different second Base station arranges dividing value on different CRE bias, is unloaded to the UE quantity of the second base station such that it is able to improve, and reduces UE and fall Words rate.

The embodiment of the present invention provides a kind of device determining cell extension biasing border, and this device can be the second base station, As shown in Figure 6, this device includes: transmitting element 600, and first determines subelement 601, computation subunit 602, determines module 6021, computing module 6022, send subelement 603, the first sending module 6031, the second sending module 6032.

Transmitting element 600, is used for obtaining the upper dividing value of cell extension biasing, and is sent by upper for the biasing of described cell extension dividing value To the first base station or network management system, in order to described first base station or described network management system bias according to described cell extension Dividing value arranges the extension bias of described second base station；

First determines subelement 601, works in the Signal to Interference plus Noise Ratio of subscriber equipment in statistics the second base station range SINR, and determine a SINR；

A described SINR is in Preset Time in described second base station range of statistics described in subscriber equipment The meansigma methods of the minimum SINR of predetermined number in SINR；Or,

A described SINR is in Preset Time in described second base station range of statistics described in subscriber equipment After SINR arranges in descending order, the minimum SINR in the SINR of preset ratio or predetermined number in described SINR.

After determining a described SINR, computation subunit 602 calculates described second base station according to a described SINR Cell extension biasing CRE bias on dividing value；

Specifically, cover half block 6021 really in described computation subunit 602, for determining described second according to target SINR Base station carries out the ultimate range of CRE extension；

Here, when the second base station adjusts in CRE bias value unloading Macro UE to second base station, need the second base station at ABS On the SINR that provides for this UE meet UE decoding and control the minimum SINR required by channel, here, minimum SINR is target SINR, Target SINR is γ_min。

Then, the computing module 6022 in described computation subunit 602, for according to described determine described in module 6021 little The ultimate range and described first of district's extension determines the described SINR that unit 601 determines, calculates the CRE of described second base station The upper dividing value of bias；

It should be noted that dividing value is each point on described CRE coverage inward flange position on described CRE bias Minima in maximum in CRE bias value corresponding when being target SINR for SINR, so that described second base station adjusts described Time during on CRE bias, dividing value unloads macro base station in UE to second base station, the described SINR that described second base station provides meets Described UE decoding controls described target SINR required by channel.

Calculate at described computing module 6022 and obtain on the CRE bias of described second base station after dividing value, send subelement 603, dividing value on described CRE bias is sent to described first base station or described network management system, in order to the first base station or institute State network management system and the extension bias of described second base station is set according to the described upper dividing value of extension biasing.It should be noted that After on described CRE bias, dividing value is sent to described first base station or described network management system, in addition it is also necessary to extend described second base The CRE stood covers；

Specifically, the first sending module 6031 in described transmission subelement 603, it is used for institute by X 2 interface between base stations State the upper dividing value of cell extension biasing and be sent to described first base station；Or

The second sending module 6032 in described transmission subelement 603, for by base station and network management system interface by institute State the upper dividing value of cell extension biasing and be sent to described network management system.

Optionally, the first sending module 6031 in described transmission subelement 603 is additionally operable to, by difference almost empty frame The cell extension biasing upper bound value list that ABS power is corresponding is sent to described first base station by X 2 interface between base stations；Or,

The second sending module 6032 in described transmission subelement 603 is additionally operable to, and is expanded community corresponding for different ABS power Exhibition biasing upper bound value list is sent to described network management system by base station and network management system interface；

Optionally, under multicarrier scene, the first sending module 6031 in described transmission subelement 603 is additionally operable to, will Under different carrier, described in cell extension biasing upper bound value list corresponding to different ABS power be sent to by X 2 interface between base stations First base station；Or,

The second sending module 6032 in described transmission subelement 603 is additionally operable to, by under different carrier, different ABS power Corresponding cell extension biasing upper bound value list is sent to described network management system by base station and network management system interface.

It should be noted that after the coverage of the second base station is carried out CRE extension, add up described CRE coverage Inside work in the SINR of UE in ABS subframe, and determine the 2nd SINR；Then according to a described SINR and described second SINR, determines dividing value on maximum CRE bias；

It should be noted that the determination method of the 2nd SINR is identical with the determination method of a SINR, specifically can refer to The determination method of one SINR determines the 2nd SINR.

Specifically, as γ '₀-γ_minDuring ＜ ε, determine that on described CRE bias, dividing value is dividing value on maximum CRE bias, its In, γ '₀For described 2nd SINR, γ_minFor described target SINR, ε is predetermined threshold value；

As γ '₀-γ_minDuring >=ε, determine δ₀=δ_max, γ₀=γ '₀, and according to determining cell coverage expansion bias border Method recalculate dividing value on CRE bias, wherein, δ₀For described initial CRE bias value, δ_maxFor on described CRE bias Dividing value, γ₀For a described SINR.

By first, a kind of device determining cell extension biasing border that the embodiment of the present invention provides, determines that unit determines Oneth SINR, then computing unit calculates dividing value on the CREbias of described second base station according to a described SINR, sends son single The cell extension of described second base station is biased upper dividing value and is sent to the first base station or network management system by unit.Right with prior art Microcell in macro base station coverage uses the scheme of unified configuration CRE bias value so that the energy when CRE bias value is less The UE being enough unloaded to the second base station is less, and when CRE bias value is bigger, UE call drop is more compares, and the embodiment of the present invention provides Scheme, arranges dividing value on different CRE bias according to the first base station according to the second different base stations, such that it is able to improve unloading To the UE quantity of the second base station, and reduce UE cutting off rate.

The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain Cover within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with scope of the claims.

Claims (12)

1. the method determining cell extension biasing border, it is characterised in that including:

The Signal to Interference plus Noise Ratio SINR of subscriber equipment in second base station described second base station range of statistics, and determine a SINR；

The upper dividing value of cell extension biasing of described second base station is calculated according to a described SINR；

Upper for the biasing of described cell extension dividing value is sent to the first base station or network management system, in order to described first base station or institute State network management system and the extension bias of described second base station is set according to the upper dividing value of described cell extension biasing.

The method determining cell extension biasing border the most according to claim 1, it is characterised in that described according to described the One SINR calculates the upper dividing value of cell extension biasing of described second base station and includes:

Determine that described second base station carries out the ultimate range of cell extension according to target SINR；

Ultimate range according to described cell extension and a described SINR, calculate in the cell extension biasing of described second base station Dividing value.

The method determining cell extension biasing border the most according to claim 1, it is characterised in that described by described second The upper dividing value of cell extension biasing of base station is sent to described first base station or described network management system includes:

By X 2 interface between base stations, upper for the biasing of described cell extension dividing value is sent to described first base station；Or,

With network management system interface, upper for the biasing of described cell extension dividing value is sent to described network management system by base station.

The method determining cell extension biasing border the most according to claim 3, it is characterised in that described by described second The upper dividing value of cell extension biasing of base station is sent to described first base station or described network management system includes: described second base station will not It is sent to described first by X 2 interface between base stations with the cell extension biasing upper bound value list that almost empty frame ABS power is corresponding Base station；Or,

Cell extension biasing upper bound value list corresponding for different ABS power is connect with network management system by described second base station by base station Mouth is sent to described network management system.

The method determining cell extension biasing border the most according to claim 4, it is characterised in that described by described second The upper dividing value of cell extension biasing of base station is sent to described first base station or described network management system includes:

Described second base station by under different carrier, cell extension biasing upper bound value list that different ABS power is corresponding pass through base station Between X2 interface be sent to described first base station；Or,

Described second base station by under different carrier, cell extension biasing upper bound value list that different ABS power is corresponding pass through base station It is sent to described network management system with network management system interface.

6. the method biasing border according to the determination cell extension according to any one of claim 1-3, it is characterised in that

A described SINR is the described SINR of subscriber equipment in described second base station range of statistics in Preset Time The meansigma methods of the minimum SINR of middle predetermined number；Or,

A described SINR is the described SINR of subscriber equipment in described second base station range of statistics in Preset Time In in descending order arrangement after, the minimum SINR in the SINR of preset ratio or predetermined number in described SINR.

7. the device determining cell extension biasing border, it is characterised in that including:

First determines subelement, the Signal to Interference plus Noise Ratio SINR of subscriber equipment in statistics the second base station range, and determines the One SINR；

Computation subunit, for calculating the upper dividing value of cell extension biasing of described second base station according to a described SINR；

Send subelement, for upper for the biasing of described cell extension dividing value is sent to the first base station or network management system, in order to institute State the extension that the first base station or described network management system arrange described second base station according to the described cell extension upper dividing value of biasing inclined Put value.

The device determining cell extension biasing border the most according to claim 7, it is characterised in that described computation subunit Including:

Determine module, for determining that described second base station carries out the ultimate range of cell extension according to target SINR；

Computing module, for the ultimate range according to described cell extension and a described SINR, calculates described second base station The upper dividing value of cell extension biasing.

The device determining cell extension biasing border the most according to claim 7, it is characterised in that described transmission subelement Including:

First sending module, for being sent to described first base by X 2 interface between base stations by upper for the biasing of described cell extension dividing value Stand；Or

Second sending module, for being sent to described with network management system interface by upper for the biasing of described cell extension dividing value by base station Network management system.

The device determining cell extension biasing border the most according to claim 9, it is characterised in that described transmission sub-list Unit includes:

Described first sending module is additionally operable to, the cell extension biasing upper dividing value row that almost empty frame ABS power is corresponding by difference Table is sent to described first base station by X 2 interface between base stations；Or,

Described second sending module is additionally operable to, and cell extension biasing upper bound value list corresponding for different ABS power is passed through base station It is sent to described network management system with network management system interface.

11. devices determining cell extension biasing border according to claim 10, it is characterised in that described transmission sub-list Unit includes:

Described first sending module is additionally operable to, by under different carrier, cell extension biasing upper dividing value row that different ABS power is corresponding Table is sent to described first base station by X 2 interface between base stations；Or,

Described second sending module is additionally operable to, by under different carrier, cell extension biasing upper dividing value row that different ABS power is corresponding Table is sent to described network management system by base station and network management system interface.

12. bias the device on border according to the determination cell extension according to any one of claim 7-9, it is characterised in that

A described SINR is the described SINR of subscriber equipment in described second base station range of statistics in Preset Time The meansigma methods of the minimum SINR of middle predetermined number；Or,

A described SINR is the described SINR of subscriber equipment in described second base station range of statistics in Preset Time In in descending order arrangement after, the minimum SINR in the SINR of preset ratio or predetermined number in described SINR.