CN102572841A - WLAN (Wireless Local Area Network) indoor coverage planning method - Google Patents

Abstract

The invention provides a WLAN (Wireless Local Area Network) indoor coverage planning method which comprises the steps of: dividing indoor layout to generate a plurality of independent spaces, classifying the independent spaces to closed spaces, opening spaces and semi-closed spaces, taking geometric centers of the independent spaces as WLAN access points, calculating signal coverage distribution of the WLAN access points, calculating coverage ranges of the WLAN access points, setting a counter i to be equal to 1, selecting the independent space corresponding to the WLAN access point with the largest coverage rage as a starting space, taking the geometric center of the starting space as a position of the ith access point, selecting a boundary furthest to the ith access point and the geometric centers of the independent spaces not covered by the i access points in front of the ith access point as a position of the i+1)th access point, judging whether the coverage ranges of the i+1 access points exceed 98% area of the indoor layout, and completing the process if the coverage ranges of the i+1 access points exceed 98% area of the indoor layout. The method is simple in work, is uniform in covering distribution, and reduces the number of the WLAN access points, so that the cost is reduced.

Description

The indoor coverage planning method of WLAN

Technical field

The present invention relates to communication and radio network technique field, be specifically related to the indoor coverage planning method of a kind of wireless network.

Background technology

The statistics of domestic and overseas operators shows in recent years, and the data service more than 70 percent occurs in indoor, but Cellular Networks is machine-processed because of its networking, and covering characteristics and cost are higher, is not suitable for being used on a large scale indoor data service and covers.The indoor covering of WLAN begins to obtain the extensive approval of operator.If when carrying out the indoor deployment of WLAN access point, do not realize planning, directly carry out on-site land survey, measure and Calibration Method, the manual work that needs are a large amount of, inefficiency and cost are higher.

For this reason, industrial quarters and academia begin to consider before deployment, to carry out indoor coverage planning.Discuss at most also is that method promptly utilizes propagation model to come estimating signal to cover distribution the most intuitively.Research shows, after definite WLAN access point, uses the signal distributions of propagation model estimation more consistent with the signal distributions of actual measurement.But the equipment of different manufacturers, WLAN type, antenna type, antenna direction and bar loss have certain influence to indoor covering signal distributions, and this is big difficulty for the indoor coverage planning of WLAN has brought.On the other hand; Much more present indoor coverage planning rests on the artificial stage, according to the deployed position of interior architecture structure and engineering staff's experience decision WLAN access point, even if planning also is to adopt the method pointwise that floods to attempt different WLAN access point positions whether to have coverage hole or excessive overlapping covering automatically; If these situation of existence need the rollback traversal; Cause the planning algorithm convergence slow easily, cover skewness, can't guarantee that also the WLAN number of access point is minimum.

Summary of the invention

The object of the present invention is to provide the indoor all standing planing method of a kind of WLAN, its work is simple, and covering is evenly distributed, and has reduced the quantity of WLAN access point, thereby has reduced cost.

The present invention realizes through following technical scheme:

The indoor all standing planing method of a kind of WLAN, may further comprise the steps: (1) is divided indoor arrangement, to produce a plurality of separate space; And separate space is categorized as enclosure space, open space and hemi-closure space, (2) are the WLAN access point with the geometric center of separate space, and the signal that calculates the WLAN access point covers and distributes; (3) coverage of calculating WLAN access point; (4) counter i=1 is set, (5) select the maximum pairing separate space of WLAN access point of coverage as initial space, and with the geometric center of the initial space position as i access point; (6) geometric center point of the boundary point of selection and i access point furthest and preceding i the unlapped separate space of access point is as the position of i+1 access point; (7) judge before the coverage of i+1 access point whether surpass indoor arrangement area 98%, (8) if surpass, then process end; Otherwise counter i=i+1 is set, and returns step (5).

Separate space comprises strong connected space and convex space, and strong connected space is meant that any two sub spaces in inside in space all are in the homonymy of metope, and convex space is meant that line between any 2 of the inside in space is all in the inside in space.

Open space is meant that the covering radius of all directions surpasses 100 meters space; Hemi-closure space is meant has bar in 100 meters on the covering radius direction, on other direction the space of clear, enclosure space is meant the space that bar is arranged in 100 meters of the covering radiuss on all directions.

Step (2) comprises following substep: the geometric center point of (2-1) selecting separate space (2-2) is calculated the signal intensity profile of WLAN access point as the WLAN access point according to following formula, and obtain with-75dBm is the zone on boundary:

Wherein PL representes that distance W LAN access point is the received signal strength signal intensity in position of d, PL ₀Expression distance W LAN access point is d ₀The received signal strength signal intensity in position; PW representes that the WLAN access point signals is transferred to apart from being the decay of barrier in the position process of d to signal; Attenuation coefficient when γ representes that the WLAN signal is propagated in separate space; (2-3) in the grid tiling of intra-zone with 1m*1m, the number of grid that the zone comprises is the coverage of WLAN access point.

The present invention has following advantage and technique effect:

1, the dispositions method of access point is simple, has higher operability, does not relate to complicated calculating;

2, reduce necessary WLAN number of access point, can effectively reduce lower deployment cost;

3, the covering of signal is even, has effectively avoided the waste of signal resource.

Description of drawings

Fig. 1 is the flow chart of the indoor all standing planing method of WLAN of the present invention.

Fig. 2 is the sketch map of separate space among the present invention.

Fig. 3 is the coverage of the WLAN access point according to the present invention.

Fig. 4 is that sketch map is disposed in the position of the initial WLAN access point of the present invention.

Fig. 5 is that sketch map is disposed in the position of the new access point of the present invention.

Fig. 6 is the signal strength signal intensity sketch map of WLAN access point of the present invention.

Embodiment

As shown in Figure 1, the indoor all standing planing method of WLAN of the present invention may further comprise the steps:

(1) indoor arrangement is divided, producing a plurality of separate space, and separate space is categorized as enclosure space, open space and hemi-closure space; Separate space comprises strong connected space and convex space; Strong connected space is meant that any two sub spaces in inside in space all are in the homonymy of metope; Convex space is meant that line between any 2 of the inside in space is all in the inside in space; Open space is meant that the covering radius of all directions surpasses 100 meters space; Hemi-closure space is meant has bar in 100 meters on the covering radius direction, on other direction the space of clear, enclosure space is meant the space that bar is arranged in 100 meters of the covering radiuss on all directions;

(2) geometric center with separate space is the WLAN access point, and calculates the signal covering distribution of WLAN access point, particularly, comprises following substep:

The geometric center point of (2-1) selecting separate space is as the WLAN access point;

(2-2) calculate the signal intensity profile of WLAN access point according to following formula,

And obtain with-75dBm is the zone on boundary:

$\mathrm{PL}={\mathrm{<figure-callout\; id="0"\; label="PL"\; filenames="HDA0000124962070000031.png,HDA0000124962070000032.png"\; state="\{\{state\}\}">PL</figure-callout>}}_0+\mathrm{PW}+10\mathrm{\&gamma;}{\log }_{10}\frac{\mathrm{<figure-callout\; id="0"\; label="d\; d"\; filenames="HDA0000124962070000031.png,HDA0000124962070000032.png"\; state="\{\{state\}\}">d</figure-callout>}}{d_{}}$

Wherein PL representes the received signal strength signal intensity in position that the said WLAN access point of distance is d, PL ₀The said WLAN access point of expression distance is d ₀The received signal strength signal intensity in position; PW representes that said WLAN access point signals is transferred to distance and is the decay (as shown in table 2) of barrier in the position process of d to signal, the attenuation coefficient (as shown in table 1) when γ representes that the WLAN signal is propagated in said separate space;

The γ value of the dissimilar separate space of table 1

	Standard-sized sheet is put	Semiclosed	Totally-enclosed
				The Γ value	γ＝2.5	γ＝3.0	γ＝3.5

Table 2 barrier is to the pad value of signal

(2-3) in the grid tiling of intra-zone with 1m*1m, the number of grid that the zone comprises is the coverage of WLAN access point;

(3) calculate the coverage of WLAN access point, as shown in Figure 3, at first distribute with certain access point signals in the indoor arrangement equal-zone of 75dbm is the boundary, adopts the grid of 1m*1m to cover then in play, its grid number is as the access point coverage;

(4) a counter i=1 is set;

(5) select the maximum pairing separate space of WLAN access point of coverage as initial space; And with the geometric center of initial space position as i access point; As shown in Figure 4, for the 1st access point in this example indoor environment and coverage thereof distribute;

(6) geometric center point of the boundary point of selection and i access point furthest and preceding i the unlapped separate space of access point is as the position of i+1 access point; As shown in Figure 5; In the residing indoor environment of this example, i+1 access point position is in the right margin of i access point overlay area symmetry transverse axis;

Whether the coverage of (7) judging preceding i+1 access point is above 98% of indoor arrangement area;

(8) if surpass, then process finishes, if surpass i=i+1 is not set, and returns step (5).

As shown in Figure 2, black region is depicted as strong connected space, and remaining 16 room is a convex space.Concrete definite method is:

(i) the filling direction of the said separate space of selection; The line segment number that metope is formed on line segment number that metope is formed on the calculated level direction and the vertical direction, the line segment number that can obtain on the horizontal direction is 16; Be 3 on the vertical direction, so the direction in the horizontal corridor of selection is that direction is filled in the space;

(ii) utilize strong connectivity criteria to obtain strong connected space; More than selected horizontal direction for filling direction; The space that Fig. 2 indoor arrangement middle is made up of stair; And this section space links to each other with the space in corridor, and any two sub spaces of interior volume that these two spaces merge are all at the homonymy of metope, and the space that therefore can obtain corridor and stair composition is strong connected space.

(iii) utilize protruding criterion to obtain convex space, in the indoor arrangement of Fig. 2, the space of forming by cubicle one by one, all in interior volume, therefore can obtain the space that these cubicles form is convex space in any 2 contact of these interior volume.

As shown in Figure 3, in above-mentioned steps (2), utilize formula 1 can in the hope of one with-75dBm is the zone on boundary, with the tiling of the grid of 1m*1m, the number of grid that said zone comprises is exactly the coverage of described WLAN access point at said intra-zone.

As shown in Figure 4; In above-mentioned steps (3); Through calculating with each space center is the scope of hypothesis WLAN access point; Obtain being formed the coverage maximum that the separate space center is a hypothesis WLAN access point with corridor and stair, therefore being formed the separate space center with corridor and stair is initial WLAN access point.

As shown in Figure 5; In above-mentioned steps (6); Select and the geometric center point of the boundary point of initial access point furthest and the unlapped separate space position as new access point, overlay area, right side geometric center point is represented among the figure is the position of new access point;

As shown in Figure 6; What Fig. 6 represented is the deployment diagram that obtains whole indoor arrangement WLAN through step (1) to (8); What whole picture showed is the signal strength distribution map of the corresponding indoor arrangement of Fig. 2; What the point of white was corresponding among the figure is the WLAN access point position, and the signal strength signal intensity of the some correspondence that color is shallow more is strong more.

Claims (4)

1. the indoor all standing planing method of WLAN is characterized in that, comprises following steps:

(1) indoor arrangement is divided, producing a plurality of separate space, and said separate space is categorized as enclosure space, open space and hemi-closure space;

(2) geometric center with said separate space is the WLAN access point, and calculates the signal covering distribution of said WLAN access point;

(3) coverage of the said WLAN access point of calculating;

(4) counter i=1 is set;

(5) select the maximum pairing separate space of WLAN access point of coverage as initial space, and with the geometric center of the said initial space position as i access point;

(6) geometric center point of the boundary point of selection and said i access point furthest and preceding i the unlapped separate space of access point is as the position of i+1 access point;

(7) judge said before the coverage of i+1 access point whether above 98% of the area of said indoor arrangement;

(8) if surpass, then process finishes, otherwise counter i=i+1 is set, and returns said step (5).

2. method according to claim 1; It is characterized in that; Said separate space comprises strong connected space and convex space; Strong connected space is meant that any two sub spaces in inside in space all are in the homonymy of metope, and said convex space is meant that line between any 2 of the inside in space is all in the inside in said space.

3. method according to claim 1 is characterized in that,

Said open space is meant that the covering radius of all directions surpasses 100 meters space;

Said hemi-closure space is meant has bar in 100 meters on the covering radius direction, the space of clear on other direction;

Said enclosure space is meant the space that bar is arranged in 100 meters of the covering radiuss on all directions.

4. method according to claim 1 is characterized in that, said step (2) comprises following substep:

The geometric center point of (2-1) selecting said separate space is as said WLAN access point;

(2-2) calculate the signal intensity profile of said WLAN access point according to following formula, and obtain with-75dBm is the zone on boundary:

Wherein PL representes the received signal strength signal intensity in position that the said WLAN access point of distance is d, PL ₀The said WLAN access point of expression distance is d ₀The received signal strength signal intensity in position, PW representes that said WLAN access point signals is transferred to distance and is the decay of barrier in the position process of d to signal, the attenuation coefficient when γ representes that the WLAN signal is propagated in said separate space;

(2-3) in the grid tiling of said intra-zone with 1m*1m, the number of grid that said zone comprises is the coverage of said WLAN access point.

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