Dynamic channel allocation method in cellular radio network and system for channel allocation

• US 6,782,263 B1
• Filed: 03/07/2001
• Issued: 08/24/2004
• Est. Priority Date: 07/17/1998
• Status: Expired due to Fees

• Current Assignee: Nokia Networks (Nokia Corporation)
• Original Assignee: Nokia Networks (Nokia Corporation)
• Inventors: Posti, Harri, Peltola, Jukka
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): LE, DUY K
• Application Number:
  US09/743,924
• Time in Patent Office: 1,266 Days
• Field of Search: 455/452.1, 455/452.2, 455/453, 455/62, 455/63.1, 455/509, 455/513, 455/514
• US Class Current: 455/452.1
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

The invention relates to a channel allocation method and a system for channel allocation in a cellular radio network which comprises at least one base transceiver station (100) and at least one subscriber terminal (104) connected to the base transceiver station. (100) over a bi-directional radio link (108). The invention is characterized in that the impact of a possible channel allocation on the interference level of the cellular radio network is taken into account in the channel allocation decision. This interference control method makes it possible to increase the capacity of a cellular network and to utilize it more efficiently.

Claims

1. A channel allocation method in a cellular radio network that includes at least one base transceiver station and at least one subscriber terminal connected to the base transceiver station over a bi-directional radio link wherein:

in the channel allocation decision, an impact of a possible channel allocation on an interference level of the cellular radio network is taken into account;

a prediction on the impact of a possible channel allocation on the interference level of the cellular network is made based on the received power level (RxLev_s) of the serving cell, the received power level (RxLev_i) of the adjacent cells and the signal qualities (RxQual_i) of the adjacent cells;

a probability P=P_s*P_n, is calculated for channel allocation, where variable P_s is dependent on the received power level (RxLev_s) of the serving cell and variable P_n is dependent on the received power level (RxLev_i) of the adjacent cells and the signal qualities (RxQual_i) of the adjacent cells;

variable P_n=II P_ni, where P_ni represents the probability on base transceiver station i and where variable P_ni obtains values between 0 and 1; and

variable P_ni is calculated linearly according to equation P_ni=a*RxLev_i+b, where variable a is dependent on signal quality (RxQual_i) and variable b is dependent on signal quality (RxQual_i).

2. The method of claim 1, wherein a call is accepted to a desired frequency reuse group, if the probability P exceeds a pre-set threshold value.

3. The method of claim 1, wherein that a call is accepted to a desired frequency reuse group, if the probability P exceeds a randomly selected threshold value.

4. The method of claim 1, wherein variable P_s obtains values between 0 and 1.

5. A system for channel allocation in a cellular radio network which includes at least one base transceiver station and at least one subscriber terminal connected to the base transceiver station over a bi-directional radio link and a serving cell,

wherein the serving cell is arranged to perform channel allocation by predicting the impact of a possible channel allocation on an interference level of the cellular radio network;

the cellular radio network further includes a serving cell and adjacent cells to the serving cell;

the system is arranged to predict the impact of a channel allocation on the interference level of the cellular network based on the received power level (RxLev_s) of the serving cell, the received power level (RxLev_i) of the adjacent cells and the signal qualities (RxQual_i) of the adjacent cells;

the system is arranged to calculate a probability P=P_s*P_n for channel allocation, where variable P_s is dependent on the received power level (RxLev_s) of the serving cell and variable P_n is dependent on the received power level (RxLev_i) of the adjacent cells and the signal qualities (RxQual_i) of the adjacent cells;

the variable P_n=Π

P_ni, where P_ni represents the probability on base transceiver station i and where variable P_ni obtains values between 0 and 1; and

the system is arranged to calculate variable P_ni linearly according to formula P_ni=a*RxLev_i+b, where variable a is dependent on signal quality (RxQual_i) and variable b is dependent on signal quality (RxQual_i).

6. The system of claim 5, wherein the system is arranged to accept the call to a desired frequency reuse group, if the probability P exceeds a pre-set threshold value.

7. The system of claim 5, wherein the system is arranged to accept the call to a desired frequency reuse group, if the probability P exceeds a randomly selected threshold value.

8. The system of claim 5, wherein the values of variable P_s are between 0 and 1.