Frequency-hopping in a bandwidth-on-demand system

• US 6,246,713 B1
• Filed: 06/08/1998
• Issued: 06/12/2001
• Est. Priority Date: 06/08/1998
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Mattisson, Sven
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Ha, Dac V.
• Application Number:
  US09/092,860
• Time in Patent Office: 1,100 Days
• Field of Search: 375/132, 375/133, 375/134, 375/135, 375/137, 375/136, 375/138, 370/330, 370/343, 370/436, 370/478, 455/450, 455/452, 455/447
• US Class Current: 375/132
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 2001/71367 using a transform
• CPC Class Codes: H04B 2001/7154 with means for preventing interference
• CPC Class Codes: H04L 5/0012 Hopping in multicarrier systems for frequency hopping in spread spectrum systems H04B1/713
• CPC Class Codes: H04L 5/0041 Frequency-non-contiguous
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling

Abstract

A radio communication system that utilizes an available frequency spectrum that is divided up into a plurality of channels to be used by the radio communication system is operated in accordance with a frequency hopping strategy that permits a user to simultaneously utilize more than one channel during each hop period, wherein it is permissible, but not mandatory, for at least one of the channels utilized by the user during a first hop period to again be used by the user during an immediately following second hop period, so long as at least one of the channels utilized by the user during the second hop period is different from all of the channels utilized by the user during the first hop period. In some embodiments, the number of channels simultaneously utilized by any one user need not be the same as the number of channels simultaneously utilized by any other user.

Claims

1. A method of operating a radio communication system that utilizes an available frequency spectrum that is divided up into a plurality of channels to be used by the radio communication system, the method comprising the steps of:

allocating a number, n, of the channels to be simultaneously used during a first hop period for communicating with a user of the radio communication system, wherein the allocated channels occupy adjacent frequency bands of the available frequency spectrum, and wherein the number n is greater than one; and

allocating n of the channels to be simultaneously used during a second hop period for communicating with the user of the radio communication system, wherein;

the n channels allocated for use during the second hop period occupy adjacent frequency bands of the available frequency spectrum;

at least one of the n channels allocated for use during the second hop period is the same as at least one of the n channels allocated for use during the first hop period; and

at least one of the n channels allocated for use during the second hop period is different from all of the channels allocated for use during the first hop period.

2. The method of claim 1, wherein the first and second hop periods are consecutively occurring hop periods.

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

allocating a second number, m, of the channels to be simultaneously used during the first hop period for communicating with a second user of the radio communication system, wherein the channels allocated for use by the second user occupy adjacent frequency bands of the available frequency spectrum; and

allocating m of the channels to be simultaneously used during the second hop period for communicating with the second user of the radio communication system, wherein;

the m channels allocated for use by the second user during the second hop period occupy adjacent frequency bands of the available frequency spectrum; and

the number m is not equal to the number n.

4. The method of claim 3, wherein:

at least one of the m channels allocated for use by the second user during the second hop period is the same as at least one of the m channels allocated for use by the second user during the first hop period; and

at least one of the m channels allocated for use by the second user during the second hop period is different from all of the channels allocated for use by the second user during the first hop period.

5. The method of claim 3, wherein:

none of the m channels allocated for use by the second user during the second hop period is the same as any of the m channels allocated for use by the second user during the first hop period.

6. The method of claim 1, further comprising the step of:

allocating n of the channels to be simultaneously used during a third hop period for communicating with the user of the radio communication system, wherein;

the third hop period immediately follows the second hop period;

the n channels allocated for use during the third hop period occupy adjacent frequency bands of the available frequency spectrum; and

none of the n channels allocated for use during the third hop period is the same as any of the n channels allocated for use during the first and second hop periods.

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

obtaining a metric representative of the quality of a connection; and

using the metric to adjust the value of the number n.

8. The method of claim 7, wherein the metric is a bit error rate.

9. The method of claim 7, wherein the metric is a frame error rate.

10. The method of claim 7, wherein the metric is a carrier-to-interference ratio.

11. An apparatus for use in a radio communication system that utilizes an available frequency spectrum that is divided up into a plurality of channels to be used by the radio communication system, the apparatus comprising:

means for allocating a number, n, of the channels to be simultaneously used during a first hop period for communicating with a user of the radio communication system, wherein the allocated channels occupy adjacent frequency bands of the available frequency spectrum, and wherein the number n is greater than one; and

means for allocating n of the channels to be simultaneously used during a second hop period for communicating with the user of the radio communication system, wherein;

the n channels allocated for use during the second hop period occupy adjacent frequency bands of the available frequency spectrum;

at least one of the n channels allocated for use during the second hop period is the same as at least one of the n channels allocated for use during the first hop period; and

at least one of the n channels allocated for use during the second hop period is different from all of the channels allocated for use during the first hop period.

12. The apparatus of claim 11, wherein the first and second hop periods are consecutively occurring hop periods.

13. The apparatus of claim 11, further comprising:

means for allocating a second number, m, of the channels to be simultaneously used during the first hop period for communicating with a second user of the radio communication system, wherein the channels allocated for use by the second user occupy adjacent frequency bands of the available frequency spectrum; and

means for allocating m of the channels to be simultaneously used during the second hop period for communicating with the second user of the radio communication system, wherein;

the m channels allocated for use by the second user during the second hop period occupy adjacent frequency bands of the available frequency spectrum; and

the number m is not equal to the number n.

14. The apparatus of claim 13, wherein:

at least one of the m channels allocated for use by the second user during the second hop period is the same as at least one of the m channels allocated for use by the second user during the first hop period; and

at least one of the m channels allocated for use by the second user during the second hop period is different from all of the channels allocated for use by the second user during the first hop period.

15. The apparatus of claim 13, wherein:

none of the m channels allocated for use by the second user during the second hop period is the same as any of the m channels allocated for use by the second user during the first hop period.

16. The apparatus of claim 11, further comprising:

means for allocating n of the channels to be simultaneously used during a third hop period for communicating with the user of the radio communication system, wherein;

the third hop period immediately follows the second hop period;

the n channels allocated for use during the third hop period occupy adjacent frequency bands of the available frequency spectrum; and

none of the n channels allocated for use during the third hop period is the same as any of the n channels allocated for use during the first and second hop periods.

17. The apparatus of claim 11, further comprising:

means for obtaining a metric representative of the quality of a connection; and

means for using the metric to adjust the value of the number n.

18. The apparatus of claim 17, wherein the metric is a bit error rate.

19. The apparatus of claim 17, wherein the metric is a frame error rate.

20. The apparatus of claim 17, wherein the metric is a carrier-to-interference ratio.