WIRELESS NETWORK DEPLOYMENT METHOD, APPARATUS AND SYSTEM

• US 20160127916A1
• Filed: 10/21/2015
• Published: 05/05/2016
• Est. Priority Date: 10/31/2014
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: TIAN, Jun, LI, Hongchun
• Granted Patent: US 9,877,205 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 16/18 Network planning tools

Abstract

A wireless network deployment method, apparatus and system where the includes: initializing the wireless network to determine a deployment area and the number of access points needing to be deployed; initializing positions of the access points, and dividing the deployment area into grids; calculating a virtual force of each access point based on signal coverage of each grid; calculating a movement position of each point according to the virtual force; performing edge controlling on each point; and terminating processing when a terminating condition is satisfied. A deployment process is simulated as a dynamic physical process, movement of the access points along a direction of a resultant force of all repulsion forces and attractive forces is controlled following the principle that an overlapping covered area produces a repulsion force and an uncovered area produces an attractive force.

Claims

1. A wireless network deployment apparatus, comprising:

a first initializing unit configured to initialize a wireless network to determine a deployment area of the wireless network and a number of access points needing to be deployed;

a second initializing unit configured to initialize positions of the access points, and divide the deployment area into grids;

a first calculating unit configured to calculate a virtual force on each access point in the wireless network based on signal coverage of each grid;

a second calculating unit configured to calculate a movement position of each access point according to the virtual force on each access point;

an edge controlling unit configured to perform edge control on each access point; and

a judging unit configured to judge whether a terminating condition is satisfied, and terminate processing when the terminating condition is satisfied to obtain a deployment result of the wireless network.

2. The apparatus according to claim 1, wherein the first calculating unit comprises:

a first calculating module configured to calculate the signal coverage of each grid to determine a set of access points covering each grid;

a searching module configured to search a neighboring area of each access point;

a first determining module configured to determine whether a type of a grid in the neighboring area is one of being not covered by any access point, being covered by the access point only, being covered by other access points, and being covered by the access point and other access points in an overlapped manner; and

a second calculating module configured to calculate the virtual force according to types of the grids in the neighboring area.

3. The apparatus according to claim 2, wherein the searching module comprises:

a first expanding module configured to expand a grid where the access point is located using the grid where the access point is located as a center to obtain an edge area, the grid where the access point is located being a searched area;

a second expanding module configured to expand the edge area, until grids in the edge area one of go beyond the deployment area and are covered by other access points only to obtain an expanded area, the edge area becoming the searched area; and

a judging module configured to judge whether the expanded area is not empty, and perform expansion taking the expanded area as a new edge area when the expanded area is not empty, otherwise, take a current searched area as the neighboring area of the access point.

4. The apparatus according to claim 2, wherein the second calculating module comprises:

a third calculating module configured to calculate attractive forces produced by the grids in the neighboring area that are not covered by any access point to the access point;

a fourth calculating module configured to calculate repulsive forces produced by the grids in the neighboring area that are covered by the access point and other access points in an overlapped manner to the access point; and

a fifth calculating module configured to add up the attractive forces produced by the grids in the neighboring area that are not covered by any access point to the access point and the repulsive forces produced by the grids in the neighboring area that are covered by the access point and other access points in an overlapped manner to the access point to obtain the virtual force of the access point.

5. The apparatus according to claim 2, wherein the second calculating module comprises:

a third calculating module configured to calculate friction forces produced by the grids in the neighboring area that are covered by the access point only to the access point;

a fourth calculating module configured to calculate an adjustment coefficient of a movement step of the access point according to the friction forces; and

an fifth calculating module configured to calculate the movement position of the access point according to a position of the access point before the access point moves, the movement step of the access point, the adjustment coefficient and the virtual force of the access point.

6. The apparatus according to claim 2, wherein the edge controlling unit comprises:

a second determining module configured to determine a set of grids located at each boundary of the deployment area in the neighboring area; and

a third determining module configured to determine whether the access point is able to proceed with moving towards each boundary according to a control function of each boundary and a set of the grids of each boundary.

7. A wireless network deployment method, comprising:

initializing the wireless network to determine a deployment area of the wireless network and a number of access points needing to be deployed;

initializing positions of the access points, and dividing the deployment area into grids;

calculating a virtual force on each access point in the wireless network based on signal coverage of each grid;

calculating a movement position of each access point according to the virtual force of each access point;

performing edge control on each access point; and

terminating processing when a terminating condition is satisfied to obtain a deployment result of the wireless network.

8. The method according to claim 7, wherein the calculating a virtual force on each access point in the wireless network based on signal coverage of each grid comprises:

calculating the signal coverage of each grid to determine a set of access points covering each grid;

searching a neighboring area of each access point;

determining whether a type of a grid in the neighboring area is one of being not covered by any access point, being covered by the access point only, being covered by other access points and being covered by the access point and other access points in an overlapped manner; and

calculating the virtual force of the access point according to types of the grids in the neighboring area.

9. The method according to claim 8, wherein the searching a neighboring area of each access point comprises:

expanding a grid where the access point is located using the grid where the access point is located as a center to obtain an edge area, the grid where the access point is located being a searched area;

expanding the edge area, until grids in the edge area one of go beyond the deployment area and are covered by other access points only to obtain an expanded area, the edge area becoming the searched area; and

performing expansion taking the expanded area as a new edge area when the expanded area is not empty, otherwise, taking a current searched area as the neighboring area of the access point.

10. The method according to claim 8, wherein the calculating the virtual force of the access point according to the types of the grids in the neighboring area comprises:

calculating attractive forces produced by the grids in the neighboring area that are not covered by any access point to the access point;

calculating repulsive forces produced by the grids in the neighboring area that are covered by the access point and other access points in an overlapped manner to the access point; and

adding up the attractive forces produced by the grids in the neighboring area that are not covered by any access point to the access point and the repulsive forces produced by the grids in the neighboring area that are covered by the access point and other access points in an overlapped manner to the access point to obtain the virtual force of the access point.

11. The method according to claim 10, wherein a formula for calculating the attractive forces comprises:

12. The method according to claim 10, wherein a formula for calculating the repulsive forces comprises:

13. The method according to claim 10, wherein a formula for calculating the virtual force comprises:

14. The method according to claim 8, wherein the calculating a movement position of each access point according to the virtual force of each access point comprises:

calculating friction forces produced by the grids in the neighboring area that are covered by the access point only to the access point;

calculating an adjustment coefficient of a movement step of the access point according to the friction forces; and

calculating a movement position of the access point according to a position of the access point before the access point moves, the movement step of the access point, the adjustment coefficient and the virtual force of the access point.

15. The method according to claim 14, wherein a formula for calculating the friction forces comprises:

F_I^f=|B_I¹|;

where, B_I¹ is a set of grids in the neighboring area covered only by the access point, and |B_I¹| is the number of the grids in the neighboring area covered only by the access point.

16. The method according to claim 14, wherein a formula for calculating the adjustment coefficient comprises:

k_I=1−

F_I^f/F_max^f;

where, F_max^f is a maximum value of the friction forces to which all the access points in the wireless network are subjected.

18. The method according to claim 8, wherein the performing edge control on each access point includes:

determining a set of grids located at each boundary of the deployment area in the neighboring area; and

determining whether the access point is able to proceed with moving towards each boundary according to a control function of each boundary and the set of the grids of each boundary.

17. The method according to supplement 14, wherein a formula for calculating the movement position comprises:

19. A computer system, including a wireless network deployment apparatus, the wireless network deployment apparatus being configured to:

initialize a wireless network to determine a deployment area of the wireless network and a number of access points needing to be deployed;

initialize positions of the access points, and divide the deployment area into grids;

calculate a virtual force on each access point in the wireless network based on signal coverage of each grid;

calculate a movement position of each access point according to the virtual force of each access point;

perform edge control on each access point; and

terminate processing when a terminating condition is satisfied to obtain a deployment result of the wireless network.