Method and an arrangement relating to telecommunications system

• US 6,112,082 A
• Filed: 09/29/1998
• Issued: 08/29/2000
• Est. Priority Date: 09/29/1997
• Status: Expired due to Term

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Magnusson, Szerker, Kallin, Harald, Almgren, K. Magnus
• Primary Examiner(s): Bost, Dwayne D.
• Assistant Examiner(s): Trinh, Sonny
• Application Number:
  US09/162,123
• Time in Patent Office: 700 Days
• Field of Search: 455/446, 455/447, 455/63, 455/69, 455/62, 455/67.1, 455/67.3, 455/522, 455/501, 455/513, 455/514, 455/422, 455/423, 455/436, 455/437, 455/442
• US Class Current: 455/425
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters

Abstract

The present invention relates to a method of compiling transmitter-to-receiver relationships in a radio system. The radio system includes at least two receivers (B48, B42) and at least one transmitter (MS1) located in at least one radio coverage area (C42) of the receivers (B42). The method for a single transmitter (MS1) comprises the steps of:

sending a signal (ARM) having known power (Put) on a transmission channel allocated to said transmitter (MS1);

measuring in at least one of the receivers (B48, B42) the power received (S48, S42) from the transmitted signal (2, ACCESS), it being guaranteed that the signal will be a solitary signal upon reception;

calculating the amplification (g48, g42) of the signal (ARM) received in the receiver; and

storing the calculated amplification (g48, g42) in a storage location in the radio system.

Claims

1. A method of compiling the relationships of transmitters to receivers in a radio system that includes at least two receivers and at least one transmitter located in at least one radio coverage area of the receivers, wherein in respect of at least one single transmitter the method comprises the steps of:

sending on a transmission channel allocated to said transmitter a signal of known power;

measuring in at least one of the receivers the power received from the transmitted signal, it being guaranteed that the signal will be a solitary signal upon reception;

calculating an amplification factor associated with the signal received in the receiver, wherein the amplification factor comprises the factor by which the transmitted signal strength is multiplied in order to obtain the received signal strength; and

storing the calculated amplification factor as a histogram, in which the X-axis represents amplification factor and the Y-axis represents the number of collected values having a certain amplification value, in a storage location in the radio system.

2. A method according to claim 1, characterized by calculating the amplification factor as the quotient between received power and transmitted power.

3. A method according to claim 1, characterized by the further step of:

establishing the identity of the receiver to which the transmitter primarily directed its transmission of the signal.

4. A method according to claim 1, characterized by repeating the method in respect of other transmitters in the radio system.

5. A method according to claim 1, in which the histogram is stored in a matrix memory, wherewith the histogram is tied in the matrix memory to a receiver that has received signals from which the values in the histogram have been generated, and also tied to a radio coverage area in which different transmitters were located at the time of transmitting said signals.

6. A method according to claim 1, in which the histogram is normalised in conjunction with storing new amplification values.

7. An arrangement for compiling transmitter-to-receiver relationships in a radio system that includes at least two receivers and at least one transmitter located in at least one of the radio coverage areas of the receiver, said arrangement including:

means for transmitting a signal of known power on a transmission channel allocated to the transmitter;

means for measuring in at least one of the receivers the power of the received transmitted signal, said signal being guaranteed to be a solitary signal upon reception;

means for calculating an amplification factor that is associated with a signal received in the receiver, said amplification factor being calculated as the quotient between received power and transmitted power wherein the amplification factor comprises the factor by which the transmitted signal strength is multiplied in order to obtain the received signal strength; and

means for storing the calculated amplification as a histogram, in which the X-axis represents amplification factor and the Y-axis represents the number of collected values having a certain amplification value, in a storage location in the radio system.

8. A method for determining cell relations between a plurality of cells in a cellular communication system comprising the steps of:

transmitting uplink access bursts from one or more mobile stations on random access channels assigned to the cells;

measuring received signal strengths of the uplink access bursts at one base station; and

processing received signal strength measurements made in response to the transmission of the uplink access bursts to determine cell relations among the cells in terms of a matrix of distributions of a cell relation parameter derived for any pair of cells.

9. The method claim 8, wherein the cell relation parameter corresponds to uplink amplification values.

10. The method of claim 8, wherein the cell relation parameter corresponds to carrier to interference ratio.

11. The method of claim 10, further comprising the steps of:

measuring received signal strength of the uplink access bursts at a plurality of base stations for each of the one or more mobile stations; and

generating one or more downlink carrier to interference ratio values for each of the one or more mobile stations as a function of the received signal strength measurements taken at the plurality of base stations.

12. A method for determining cell relations between a plurality of cells in a cellular communication system comprising the steps of:

transmitting uplink access bursts from one or more mobile stations on random access channels assigned to the cells;

measuring received signal strengths of the uplink access bursts at one base station; and

processing received signal strength measurements made in response to the transmission of the uplink access bursts to determine cell relations among the cells in terms of a matrix of distributions of a cell relation parameter derived for any pair of cells, wherein the cell relation parameter corresponds to carrier to interference ratio, and wherein the method further comprising the steps of;

storing the received signal strength measurements of the uplink access bursts associated with mobile stations located outside a cell corresponding to the one base station, wherein the stored signal strength measurements are considered by the one base station to be measurements of interference;

storing signal strength measurements associated with a carrier signal transmitted from the one base station; and

determining a distribution of carrier to interference ratio values as a function of the stored signal strength measurements associated with the mobile stations located outside the cell corresponding to the one base station and as a function of the signal strength measurements associated with the carrier signal transmitted from the one base station.