Method for configuring a communication network, related network architecture and computer program product therefor

• US 7,286,854 B2
• Filed: 06/27/2003
• Issued: 10/23/2007
• Est. Priority Date: 06/27/2003
• Status: Expired due to Term

• Current Assignee: Pirelli & C SPA, Telecom Italia S.p.A.
• Original Assignee: Pirelli & C SPA, Telecom Italia S.p.A.
• Inventors: Stola, Loris Paolo, La Piana, Alessandro, Ferrato, Marco, Dell'anna, Valeria, Giovanardi, Enrico
• Primary Examiner(s): Phu; Sanh D.
• Application Number:
  US10/562,425
• Publication Number:
  US 20060148524A1
• Time in Patent Office: 1,579 Days
• Field of Search: 455/562.1, 455/446, 455/19, 455/82, 455/553.1, 342/378, 342/372
• US Class Current: 455/562.1
• CPC Class Codes: H04W 16/18 Network planning tools
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A communication network includes a plurality of antennas and includes among the antennas at least one reconfigurable antenna adapted to serve communication traffic in a respective coverage area, the reconfigurable antenna having a radiation diagram exhibiting a plurality of selectively adjustable gain values for a set of directions, each direction in the set defining a propagation path between the antenna and a portion of the coverage area, determining, for each direction in the set, at least one value of communication traffic and at least one attenuation value over the propagation path, and selectively and independently alloting to each direction in the set a respective gain value as a function of at least one of the value of communication traffic and the attenuation value determined for that direction. The arrangement is adapted for use in communication networks such as second and third generation mobile communication networks employing electrically controllable antennas.

Claims

1. A method for configuring a communication network having a plurality of antennas comprising the steps of:

a) including in said plurality of antennas at least one reconfigurable antenna adapted to serve communication traffic in a respective coverage area, said reconfigurable antenna having a radiation diagram exhibiting a plurality of selectively adjustable gain values for a set of directions, each direction in said set defining a propagation path between the antenna and a portion of said coverage area;

b) determining, for each direction in said set, at least one value of communication traffic and at least one attenuation value over said propagation path; and

c) selectively and independently allotting to each direction in said set a respective gain value in the radiation diagram of said reconfigurable antenna as a function of said at least one of said traffic value (T_pixel) and of said attenuation value (a_pixel) determined for said direction.

2. The method of claim 1, wherein said gain value for each said direction is allotted as the gain maximising a ratio of said traffic value to said attenuation value.

3. The method of claim 1, wherein said gain value for each said direction is allotted as the gain optimising a cost function (f(a₀)) wherein said traffic value and said attenuation value represent benefit and cost factors, respectively.

4. The method of claim 1, comprising the steps of:

subdividing said coverage area of said at least one reconfigurable antenna in a plurality of portions each including a plurality of pixels, wherein each said pixel has an associated value of communication traffic (T_pixel) and a propagation path from said antenna with an associated attenuation value, (a_pixel), whereby each said pixel has an associated benefit/cost ratio being the ratio of said associated communication traffic value (T_pixel) to said associated attenuation value (a_pixel);

defining an optimisation function for all the pixels within a given portion depending on said benefit/cost ratio for the pixels in said portion; and

allotting to the direction in said radiation diagram identifying each said portion a respective gain value optimising said optimisation function.

5. The method of claim 4, wherein each said pixel having associated a given value of attenuation, and a_min being the minimum value of the values of attenuation for all the pixels in said given portion, said optimisation function is defined as

f(a₀)=(1/a₀)Σ

T_pixel/a_pixel

where the summation extends for a_pixel from a_min to a₀ over all the pixels in a given portion of said coverage area, and T_pixel/a_pixel is said benefit/cost ratio.

6. The method of claim 1, comprising the steps of:

selecting said at least one reconfigurable antenna as an antenna having a maximum gain value (G_max);

determining for each direction in said set a respective attenuation value (a_mi) to be compensated by a respective gain value in said radiation diagram, said attenuation values having a maximum (A_max); and

associating with said direction in said radiation diagram gain values based on the relationship;

G_mi=G_max−

(A_max−

a_mi),

wherein G_max is said maximum gain, A_max is said maximum of attenuation and a_mi is the attenuation value determined for the direction to which the gain G_mi is assigned.

7. The method of claim 1, comprising the steps of:

determining a field intensity value (E_min) required to provide said communication traffic over the area covered by the radiation diagram of said at least one reconfigurable antenna;

determining a power value (P_feed) for said antenna to provide said field value (E_min),

comparing said power value determined (P_feed) with a maximum threshold value; and

if said power value as determined (P_feed) exceeds said maximum threshold value, issuing a signal indicating that the antenna is to be relocated.

8. The method of claim 1, comprising the steps of:

configuring said network as a step of planning a still undeployed network; and

determining said respective value of communication traffic (T_pixel) as a planned parameter of said still undeployed network.

9. The method of claim 1, comprising the steps of:

configuring said network as a step of managing an already existing network; and

determining said respective value of communication traffic (T_pixel) as at least one of a forecast parameter and a measured parameter of said already existing network.

10. A method for configuring a communication network including a plurality of antennas each serving a respective amount of traffic within a respective coverage area, comprising the steps of:

determining a reference amount of traffic (T_m) served by said plurality of antennas in the network;

setting at least one difference threshold with respect to said reference amount of traffic (T_m);

identifying among said plurality of antennas a subset of antennas, wherein the respective amounts of traffic served by the antennas in said subset reach said difference threshold; and

configuring the antennas in said subset as reconfigurable antennas, each having a radiation diagram exhibiting a plurality of selectively adjustable gain values for a set of directions, each direction in said set defining a propagation path between the antenna and a portion of said coverage area; and

applying to the reconfigurable antennas in said subset the steps b) and c) of claim 1 to reconfigure said network.

11. The method of claim 10, comprising the step of defining said reference amount of traffic as the average amount of traffic (T_m) served by said plurality of antennas.

12. The method of claim 10, comprising the step of checking the performance level of said reconfigured network.

13. The method of claim 12, comprising the steps of:

defining at least one criterion for satisfactory performance level of said network;

checking the performance level of said reconfigured network against said criterion; and

if said checking reveals that said performance level fails to meet said criterion, taking at least one of the steps of;

varying said reference amount of traffic (T_m),

increasing the number of said reconfigurable antennas in said subset, and

increasing the total number of antennas in the network.

14. A network architecture for a communication network including a plurality of antennas comprising:

at least one reconfigurable antenna adapted to serve communication traffic in a respective coverage area, wherein

said at least one reconfigurable antenna has a radiation diagram exhibiting a plurality of selectively adjustable gain values for a set of directions, and wherein

each direction in said set defines a propagation path between the antenna and a portion of said coverage area, and

has associated

at least one value of communication traffic (T_pixel) and at least one attenuation value (a_pixel) over said propagation path, and

a respective gain value for said radiation diagram which is a function of at least one of said traffic value (T_pixel) and of said attenuation value (a_pixel).

15. The network architecture of claim 14, wherein said gain value for each said direction is the gain maximising a ratio of said traffic value to said attenuation value.

16. The network architecture of claim 14, wherein said gain value for each said direction is the gain optimising a cost function (f(a₀)) wherein said traffic value and said attenuation value represent benefit and cost factors, respectively.

17. The network architecture of claim 14, wherein

said coverage area of said at least one reconfigurable antenna is subdivided in a plurality of portions each including a plurality of pixels, wherein each said pixel has an associated value of communication traffic (T_pixel) and a propagation path from said antenna with an associated attenuation value (a_pixel), whereby each said pixel has an associated benefit/cost ratio being the ratio of said associated communication traffic value (T_pixel) to said associated attenuation value (a_pixel),

for all the pixels within a given portion an optimisation function exists depending on said benefit/cost ratio for the pixels in said portion, and

said gain value for each said direction is the gain optimising said function.

18. The network architecture of claim 17, wherein each said pixel having associated a given value of attenuation and a_min is the minimum value of the values of attenuation for all the pixels in said given portion, said optimisation function being defined as

f(a₀)=(1/a₀)Σ

T_pixel/a_pixel

where the summation extends for a_pixel, from a_min to a₀ over all the pixels in a given portion of said coverage area, wherein T_pixel/a_pixel is said benefit/cost ratio.

19. The network architecture of claim 14, wherein

said at least one reconfigurable antenna is an antenna having a maximum gain value (G_max), and wherein for each direction in said set a respective attenuation value (a_mi) exists to be compensated by a respective gain value in said radiation diagram, said attenuation values having a maximum (A_max), and

each said direction in said radiation diagram has an associated gain value G_mi based on the relationship:

G_mi=G_max−

(A_max−

a_mi),

wherein G_max is said maximum gain value, A_max is said maximum attenuation and a_mi is an attenuation value determined for the direction to which the gain value G_mi is assigned.

20. A computer program product capable of being loadable in the memory of at least one computer and including software code portions for performing a method of configuring a communication network having a plurality of antennas, the method comprising the steps of:

a) including in said plurality of antennas at least one reconfigurable antenna adapted to serve communication traffic in a respective coverage area, said reconfigurable antenna having a radiation diagram exhibiting a plurality of selectively adjustable gain values for a set of directions, each direction in said set defining a propagation path between the antenna and a portion of said coverage area;

b) determining, for each direction in said set, at least one value of communication traffic and at least one attenuation value over said propagation path; and

c) selectively and independently allotting to each direction in said set a respective gain value in the radiation diagram of said reconfigurable antenna as a function of said at least one of said traffic value (T_pixel) and of said attenuation value (a_pixel) determined for said direction.

21. A method for configuring a communication network including a plurality of antennas, the method comprising:

including in said plurality of antennas at least one reconfigurable antenna adapted to serve communication traffic in a respective coverage area, said reconfigurable antenna having a radiation diagram exhibiting a plurality of selectively adjustable gain values for a set of directions, each direction in said set defining a propagation path between the antenna and a portion of said coverage area, each portion including a plurality of pixels, wherein each pixel has an associated value of communication traffic and a propagation path from said antenna with an associated attenuation value;

determining, for each direction in said set, a reference attenuation value over the propagation path defined by the direction, said reference attenuation value depending on a benefit/cost ratio for the pixels included in said portion, said benefit/cost ratio being a ratio between said communication traffic value and said attenuation value in each said pixel;

determining a maximum attenuation value (A_max) of said reference attenuation values (a_mi) associated with each direction;

determining a maximum gain value (G_max) of said radiation diagram of said at least one reconfigurable antenna in said coverage area;

associating said maximum gain value with the direction having said maximum attenuation value; and

determining for the other directions a respective gain value (G_mi) in the radiation diagram of said reconfigurable antenna based on the relationship

G_mi=G_max−

(A_max−

a_mi).

22. The method of claim 21, wherein said reference attenuation value corresponds to the attenuation value that maximizes an optimization function (f(a₀)) defined as:

f(a₀)=(1/a₀)Σ

T_pixel/a_pixel

where T_pixel/a_pixel is said benefit/cost ratio and the summation extends from an attenuation value a_min to an attenuation value a₀ over all the pixels included in said portion of said coverage area, said attenuation value a_min being the minimum value of the values of attenuation for all the pixels included in said portion.

23. The method of claim 21, further comprising:

determining a field intensity value required to provide said communication traffic over the area covered by the radiation diagram of said at least one reconfigurable antenna;

determining a power value for said antenna to provide said field value;

comparing said power value determined with a maximum threshold value; and

if said power value as determined exceeds said maximum threshold value, issuing a signal indicating that the antenna is to be relocated.

24. The method of claim 21, further comprising:

configuring said network as a step of planning a still undeployed network; and

determining said value of communication traffic as a planned parameter of said still undeployed network.

25. The method of claim 21, further comprising:

configuring said network as a step of managing an already existing network; and

determining said value of communication traffic as at least one of a forecast parameter and a measured parameter of said already existing network.

26. A method for configuring a communication network including a plurality of antennas each serving a respective amount of traffic within a respective coverage area, the method comprising:

determining a reference amount of traffic served by said plurality of antennas in the network;

setting at least one difference threshold with respect to said reference amount of traffic;

identifying among said plurality of antennas a subset of antennas, wherein the respective amounts of traffic served by the antennas in said subset reach said difference threshold;

configuring the antennas in said subset as reconfigurable antennas, each having a radiation diagram exhibiting a plurality of selectively adjustable gain values for a set of directions, each direction in said set defining a propagation path between the antenna and a portion of said coverage area; and

applying to the reconfigurable antennas in said subset the following steps to reconfigure said network;

determining, for each direction in said set, a reference attenuation value over the propagation path defined by the direction, said reference attenuation value depending on a benefit/cost ratio for the pixels included in said portion, said benefit/cost ratio being a ratio between a communication traffic value and an attenuation value in each said pixel; and

determining a maximum attenuation value of said reference attenuation values associated with each direction.

27. The method of claim 26, further comprising:

defining said reference amount of traffic as the average amount of traffic served by said plurality of antennas.

28. The method of claim 26, further comprising:

checking the performance level of said reconfigured network.

29. The method of claim 28, further comprising:

defining at least one criterion for satisfactory performance level of said network;

checking the performance level of said reconfigured network against said criterion; and

if said checking reveals that said performance level fails to meet said criterion, taking at least one of the steps of;

varying said reference amount of traffic,

increasing the number of said reconfigurable antennas in said subset, and

increasing the total number of antennas in the network.

30. A network architecture for a communication network including a plurality of antennas, the network architecture comprising:

at least one reconfigurable antenna adapted to serve communication traffic in a respective coverage area,

wherein said at least one reconfigurable antenna has a radiation diagram exhibiting a plurality of selectively adjustable gain values for a set of directions, and wherein each direction in said set;

defines a propagation path between the antenna and a portion of said coverage area, said portion including a plurality of pixels, wherein each pixel has an associated value of communication traffic and a propagation path from said antenna with an associated attenuation value, and

has associated;

a reference attenuation value over the propagation path defined by the direction, said reference attenuation value depending on a benefitlcost ratio for the pixels included in said portion, said benefitlcost ratio being a ratio between said communication traffic value and said attenuation value in each said pixel, and

a respective gain value (G_mi), said respective gain value being determined by means of the relationship

G_mi=G_max−

(A_max−

a_mi)

where A_max is a maximum attenuation value of said reference attenuation values (a_mi) associated with each direction in said coverage area and G_max is the maximum gain value of said radiation diagram of said at least one reconfigurable antenna associated with the direction having said maximum attenuation value.

31. The network architecture of claim 30, wherein said reference attenuation value corresponds to the attenuation value that maximises an optimization function (f(a₀)) defined as:

f(a₀)=(1/a₀)Σ

T_pixel/a_pixel

where T_pixel/a_pixel is said benefit/cost ratio and the summation extends from an attenuation value a_min to an attenuation value a₀ over all the pixels included in a given portion of said coverage area, said attenuation value a_min being the minimum value of the values of attenuation for all the pixels included in said given portion.

32. A computer program product loadable in the memory of at least one computer and including software code portions for performing a method of configuring a communication network including a plurality of antennas, the method comprising:

including in said plurality of antennas at least one reconfigurable antenna adapted to serve communication traffic in a respective coverage area, said reconfigurable antenna having a radiation diagram exhibiting a plurality of selectively adjustable gain values for a set of directions, each direction in said set defining a propagation path between the antenna and a portion of said coverage area, each portion including a plurality of pixels, wherein each pixel has an associated value of communication traffic and a propagation path from said antenna with an associated attenuation value;

determining, for each direction in said set, a reference attenuation value over the propagation path defined by the direction, said reference attenuation value depending on a benefit/cost ratio for the pixels included in said portion, said benefit/cost ratio being a ratio between said communication traffic value and said attenuation value in each said pixel;

determining a maximum attenuation value (A_max) of said reference attenuation values (a_mi) associated with each direction;

determining a maximum gain value (G_max) of said radiation diagram of said at least one reconfigurable antenna in said coverage area;

associating said maximum gain value with the direction having said maximum attenuation value; and

determining for the other directions a respective gain value (G_mi) in the radiation diagram of said reconfigurable antenna based on the relationship

G_mi=G_max−

(A_max−

a_mi).