Method and apparatus for automatic channel measurements

• US 5,991,622 A
• Filed: 08/22/1997
• Issued: 11/23/1999
• Est. Priority Date: 08/22/1997
• Status: Expired due to Term

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Henry, Raymond C. Jr.
• Primary Examiner(s): Trost, William G.
• Assistant Examiner(s): LEGREE, TRACY MICHELLE
• Application Number:
  US08/916,848
• Time in Patent Office: 823 Days
• Field of Search: 455/67.1, 455/455, 455/450-452, 455/165.1, 455/183.1, 455/185.1, 455/186.1, 455/464, 455/509, 455/513, 455/515, 455/516, 455/176.1, 455/179.1 , 455/180.1, 455/226.1, 455/226.2, 455/260, 455/266, 455/434, 455/161.1-161.3
• US Class Current: 455/434
• CPC Class Codes: H04B 17/327 Received signal code power [RSCP]
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

A mobile station for measuring signal strength of a set of channels includes a synthesizer, a controller and a transceiver. During an idle period, the controller loads channel data of the set of channels contained into a memory block in the synthesizer. The synthesizer automatically selects the channel data for each channel stored in the memory block and generates a frequency signal corresponding to the selected channel data. The transceiver measures the signal strength data of the selected channel data and stores the signal strength data in a buffer. Once the signal strength data for the entire set of channels has been measured and stored in the buffer, the transceiver transmits the signal strength data to the controller. The set of channels may include a set of channels from a neighbor cell list or measurement order transmitted by the radio base station. The set of channels may also include a set of control channels that the mobile station measures at power-up.

Claims

1. A method of measuring signal strength for a set of channels, comprising the steps of:

storing channel data for a set of channels into a memory;

for each channel in the set of channels;

automatically selecting channel data for a channel without controller interaction;

generating a frequency signal corresponding to the selected channel data;

generating a stable interrupt signal to a controller in response to the step of generating the frequency signal corresponding to the selected channel data;

generating a measurement signal to a receiver in response to the stable interrupt signal; and

measuring signal strength data of the channel responsive to the frequency signal.

2. The method of claim 1, further comprising the steps of:

in response to said step of measuring signal strength data of the selected channel in response to the frequency signal, transmitting an interrupt signal to the controller which contains the signal strength data of the selected channel.

3. The method of claim 1,

wherein the step of measuring signal strength data comprises measuring signal strength data of the selected channel responsive to the frequency signal and the measurement signal.

4. The method of claim 3, further including the step of:

in response to the step of measuring signal strength data of the selected channel, transmitting an interrupt signal to the controller which contains the signal strength data of the selected channel.

5. The method of claim 3, further including the steps of:

for each channel in the set of channels, storing signal strength data measured for the selected channel in a buffer; and

in response to measuring signal strength data of all the selected channels in the set of channels, transmitting an interrupt signal to a controller which contains the signal strength data of all the selected channels in the set of channels.

6. The method of claim 5, further including the steps of:

receiving a set of channels to be measured from a radio base station; and

wherein said step of storing channel data for a set of channels into a memory of a synthesizer comprises storing channel data for the set of channels received from the radio base station into a memory of a synthesizer in a mobile station.

7. The method of claim 6, wherein said storing step is performed in response to an idle period of the mobile station.

8. The method of claim 7, further comprising the step of generating a measurement report which includes the signal strength data of all the selected channels in the set of channels.

9. A device for measuring signal strength of a set of channels, comprising:

a memory for storing channel data of varying sets of channels;

a controller for loading channel data of varying sets of channels into said memory;

a synthesizer that automatically selects channel data stored in said memory for each channel in the set of channels without controller interaction and generates a frequency signal corresponding to the selected channel data said synthesizer including;

a timing sequencer for automatically selecting channel data stored in said memory for each channel in the set of channels; and

a transceiver for measuring signal strength data for each channel in the set of channels in response to the generated frequency signal of said synthesizer.

10. The device of claim 9, further including:

a buffer for storing signal strength data for the set of channels measured by said transceiver; and

wherein said transceiver communicates the signal strength data for the set of channels to the controller in response to completing the signal strength data measurements for the set of channels stored in said memory.

11. The device of claim 10, wherein said memory for storing channel data of a set of channels is a register block in said synthesizer.

12. The device of claim 11, wherein said synthesizer that automatically selects channel data for each channel in the set of channels stored in said memory and generates a frequency signal corresponding to each selected channel, comprises:

a phase locked loop for generating a frequency signal corresponding to each selected channel.

13. The device of claim 12, wherein said transceiver measures signal strength data for each channel in the set of channels in response to the output measure signal.

14. The device of claim 12, wherein said timing sequencer for automatically selecting channel data for each channel in the set of channels stored in said register block, generates:

an output control signal to select a register in said register block, and

an output measure signal.

15. The device of claim 14, wherein said phase locked loop for generating a frequency signal corresponding to each selected channel, comprises:

a phase detector for comparing a phase of each selected channel with a phase of reference signal and generating an error voltage signal proportional to a difference in the phases; and

a voltage controlled oscillator for generating the frequency signal corresponding to the selected channel in response to the error voltage signal.

16. The device of claim 15, wherein said device is a mobile station in a wireless communications system.

17. A wireless communications system, comprising:

a radio base station;

at least one mobile station that interfaces with said radio base station, wherein said radio base station transmits a set of channels to be measured by said mobile station, and wherein said mobile station comprises;

a controller for processing the set of channels to be measured;

a synthesizer, comprising;

a memory for storing channel data for the set of channels to be measured;

a timing sequencer for automatically selecting channel data stored in said memory for each channel in the set of channels; and

a phase locked loop for generating a frequency signal corresponding to the selected channel data; and

a receiver for measuring signal strength data corresponding to the generated frequency signal of said synthesizer.

18. The wireless communications system of claim 17, wherein said receiver comprises a buffer for storing signal strength data for the set of channels measured by said receiver and wherein said receiver transmits the signal strength data for the entire set of channels to the controller upon completion of measuring signal strength data of each channel.

19. The wireless communications system of claim 18, wherein said timing sequencer of said synthesizer generates

an output control signal for selection of channel data for each channel in the set of channels, and

an output measure signal.

20. The wireless communications system of claim 17, wherein said timing sequencer of said synthesizer generates

an output control signal for selection of channel data for each channel in the set of channels, and

an output table signal for indicating the generation of the frequency signal corresponding to the selected channel data by the phase locked loop.

21. The wireless communications system of claim 20, wherein said controller generates an output measurement signal in response to said output stable signal, wherein said transceiver measures the signal strength data corresponding to the generated frequency signal of said synthesizer in response to said output measurement signal.