Enhanced beacon signaling method and apparatus

• US 8,619,698 B2
• Filed: 04/21/2008
• Issued: 12/31/2013
• Est. Priority Date: 10/14/2004
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Laroia, Rajiv, Lane, Frank A., Li, Junyi
• Primary Examiner(s): Jiang, Charles C
• Application Number:
  US12/106,846
• Publication Number:
  US 20080192690A1
• Time in Patent Office: 2,080 Days
• Field of Search: 370203-211, 370310-350, 375295-315
• US Class Current: 370/330
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

Methods and apparatus for using high power narrow signals, e.g., tones, for communicating transmitter information without putting the full transmission power available into the transmitted tone or tones are described. User data is transmitted in parallel with transmitter information in many embodiments with the user data being allocated more than 20% of the transmitter'"'"'s maximum output power in many cases. Buy using an amount of power on the tones used to communicate transmitter information while simultaneously transmitting user data with more than 20% of the available transmission power, efficient bandwidth utilization is achieved while still ensuring a high probability that that the transmitter information signals will be received and detectable using simple energy detection techniques and without the need for timing synchronization with the transmitter to be achieved for success interpretation of the transmitter information.

Claims

1. A base station for use in a frequency division multiplexed communications system, the base station comprising:

a transmitter that uses a set of N tones to communicate information into a first region, where N is larger than 10;

a first control circuit, coupled to said transmitter, configured to control the transmitter to transmit over a first period of time using first signals into the first region, said first period of time being at least two seconds long; and

a second control circuit, coupled to said transmitter, configured to control the transmitter to transmit during a second period of time a second signal including a set of X tones into said first region, where X is a positive integer less than 5, and where less than 80% of a maximum average total base station transmission power used by said base station transmitter to transmit into the first region during any 1 second period during said first period of time is allocated to said set of X tones and where each one of said X tones to which power is allocated is at least 20 times the per tone maximum average power allocated to tones during any one second time period in said first time period.

2. The base station of claim 1, wherein:

said second period of time occurs within said first period of time; and

said X tones is a subset of said N tones.

3. The base station of claim 2, further comprising:

a storage device including stored user data including at least one of voice, text and image data to be communicated; and

wherein said first control circuit controls said transmitter to transmit user data on at least one tone during said first period of time and to transmit user data on a plurality of Y tones which are a subset of said N tones, said Y tones not being included in said X tones during said second period of time.

4. A base station for use in a frequency division multiplexed communications system, the base station comprising:

a processor configured to;

control said base station to transmit first signals into a first region using a set of N tones to communicate information over a first period of time, said first period of time being at least two seconds long, where N is larger than 10; and

control said base station to transmit, during a second period of time, a second signal including a set of X tones into said first region, where X is less than 5, and where less than 80% of a maximum average total base station transmission power used by said base station to transmit signals into the first region during any 1 second period during said first period of time is allocated to said set of X tones and each one of said X tones to which power is allocated receives at least 20 times the per tone average power allocated to tones during said any one second period.

5. The base station of claim 4, wherein:

said second period of time occurs within said first period of time; and

said X tones is a subset of said N tones.

6. The base station of claim 4, wherein the processor is further configured to:

control said base station to transmit user data using Y tones during said second period of time, said Y tones being tones within said set of N tones that are not included in said X tones, where Y is a positive integer greater than one, more than 20% of the total transmitter power used during said second period of time being allocated to the Y tones during said second time period.

7. A computer program product comprising:

non-transitory machine readable medium embodying machine executable instructions for controlling a base station in a frequency division multiplexed communications system, the non-transitory machine readable medium comprising;

instructions for causing said base station to transmit first signals into a first region using a set of N tones to communicate information over a first period of time, said first period of time being at least two seconds long, where N is larger than 10; and

instructions for causing said base station to transmit, during a second period of time, a second signal including a set of X tones into said first region, where X is less than 5, and where less than 80% of a maximum average total base station transmission power used by said base station to transmit signals into the first region during any 1 second period during said first period of time is allocated to said set of X tones and each one of said X tones to which power is allocated receives at least 20 times the per tone average power allocated to tones during said any one second period.

8. The computer program product of claim 7, wherein:

said second period of time occurs within said first period of time; and

said X tones is a subset of said N tones.

9. The computer program product of claim 7, wherein the non-transitory machine readable medium further includes:

instructions for causing said base station to transmit user data using Y tones during said second period of time, said Y tones being tones within said set of N tones that are not included in said X tones, where Y is a positive integer greater than one, more than 20% of the total transmitter power used during said second period of time being allocated to the Y tones during said second time period.

10. An apparatus for use in abuse station comprising:

a transmitter configured to transmit signals and user data; and

a control circuit configured to control the transmission of a signal in a first period of time, said signal including a plurality of M signal tones, where M is larger than 10, each signal tone corresponding to a different frequency, said first period of time being at least two seconds long, said signal including a beacon signal transmitted on at least one tone and a user data signal transmitted in parallel with said beacon signal on tones which are not used to transmit said beacon signal, said user data having been transmitted by said base station transmitter with more than 20% of the maximum average total base station transmission power used by said base station transmitter to transmit signals into a first region during any 1 second period of time during said first period of time.

11. The apparatus of claim 10, wherein at least N times the average per signal tone energy of said transmitted signal is transmitted on each of the tones in the signal used to transmit said beacon signal, where M is a positive value greater than 5.

12. The apparatus of claim 10, wherein at least N times the average per signal tone energy of said transmitted signal is transmitted on each of the tones in the signal used to transmit said beacon signal, where N is a positive value greater than 20.

13. A base station transmitter comprising:

a processor configured to;

control said base station transmitter to transmit a signal in a first period of time, said signal including a plurality of M signal tones, where M is larger than 10, each signal tone corresponding to a different frequency, said first period of time being at least two seconds long, said signal including a beacon signal transmitted on at least one tone and a user data signal transmitted in parallel with said beacon signal on tones which are not used to transmit said beacon signal, said user data having been transmitted by said base station transmitter with more than 20% of the maximum average total base station transmission power used by said base station transmitter to transmit signals into a first region during any 1 second period of time during said first period of time.

14. The base station transmitter of claim 13, wherein at least N times the average per signal tone energy of said transmitted signal is transmitted on each of the tones in the signal used to transmit said beacon signal, where M is a positive value greater than 5.

15. The base station transmitter of claim 13, wherein at least N times the average per signal tone energy of said transmitted signal is transmitted on each of the tones in the signal used to transmit said beacon signal, where N is a positive value greater than 20.

16. A computer program product comprising:

non-transitory machine readable medium embodying machine executable instructions for controlling a base station transmitter, the non-transitory machine readable medium comprising;

instructions for causing said base station transmitter to transmit a signal in a first period of time, said signal including a plurality of M signal tones, where M is larger than 10, each signal tone corresponding to a different frequency, said first period of time being at least two seconds long, said signal including a beacon signal transmitted on at least one tone and a user data signal transmitted in parallel with said beacon signal on tones which are not used to transmit said beacon signal, said user data having been transmitted by said base station transmitter with more than 20% of the maximum average total base station transmission power used by said base station transmitter to transmit signals into a first region during any 1 second period of time during said first period of time.

17. The computer program product of claim 16, wherein at least N times the average per signal tone energy of said transmitted signal is transmitted on each of the tones in the signal used to transmit said beacon signal, where M is a positive value greater than 5.

18. The computer program product of claim 16, wherein at least N times the average per signal tone energy of said transmitted signal is transmitted on each of the tones in the signal used to transmit said beacon signal, where N is a positive value greater than 20.

19. An apparatus for use in a base station comprising:

means for transmitting signals and user data; and

means for controlling the transmission of a signal in a first period of time, said signal including a plurality of M signal tones, where M is larger than 10, each signal tone corresponding to a different frequency, said first period of time being at least two seconds long, said signal including a beacon signal transmitted on at least one tone and a user data signal transmitted in parallel with said beacon signal on tones which are not used to transmit said beacon signal, said user data having been transmitted by said means for transmitting with more than 20% of the maximum average total base station transmission power used by said means for transmitting to transmit signals into a first region during any 1 second period of time during said first period of time.

20. The apparatus of claim 19, wherein at least N times the average per signal tone energy of said transmitted signal is transmitted on each of the tones in the signal used to transmit said beacon signal, where M is a positive value greater than 5.

21. The apparatus of claim 19, wherein at least N times the average per signal tone energy of said transmitted signal is transmitted on each of the tones in the signal used to transmit said beacon signal, where N is a positive value greater than 20.

22. A method of operating a base station transmitter in a communication system, the method comprising:

transmitting a signal in a first period of time, said signal including a plurality of M signal tones, where M is larger than 10, each signal tone corresponding to a different frequency, said first period of time being at least two seconds long and including multiple symbol transmission time periods, said signal including a beacon signal transmitted on at least one tone and a user data signal transmitted in parallel with said beacon signal on tones which are not used to transmit said beacon signal, said user data having been transmitted by said base station transmitter with more than 20% of the maximum average total base station transmission power used by said base station transmitter to transmit signals into a first region during any 1 second period of time during said first period of time; and

wherein said base station transmitter is a sector transmitter of a multi-sector base station.