Dynamic channel assignment

• US 20050286467A1
• Filed: 09/01/2005
• Published: 12/29/2005
• Est. Priority Date: 03/22/2000
• Status: Active Grant

• Current Assignee: Bruce Edwin Mcnair, Justin Che-I Chuang, Kapil K. Chawla, Li Fung Chang, Xiaoxin Qiu
• Original Assignee: Bruce Edwin Mcnair, Justin Che-I Chuang, Kapil K. Chawla, Li Fung Chang, Xiaoxin Qiu
• Inventors: Chang, Li Fung, Qiu, Xiaoxin, Chawla, Kapil K., Chuang, Justin Che-I, McNair, Bruce Edwin
• Granted Patent: US 7,457,259 B2
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

This invention provides interference predictions, suitable for least interference dynamic channel assignment use or other frequency hopping uses by de-coupling the time slot assignment and the frequency hopping pattern assignment. In particular, a least interfered time slot is selected based on an aggregate interference measurement performed across an entire transmission band or a pre-specified range of frequencies in the transmission band. A user is assigned a least interfered time slot and provided an appropriate frequency hopping pattern.

Claims

1. A method for dynamic channel assignment in a time division multiple access (TDMA) scheme, comprising:

measuring noise levels of time slots across a predetermined frequency range;

selecting a time slot with an acceptable noise level;

assigning a time slot to a user; and

assigning a frequency hopping pattern to the user.

11. The method of claim 1, wherein the frequency hopping pattern is assigned independently from other frequency hopping pattern assignments.

12. The method of claim 11, wherein the frequency hopping pattern is assigned pseudo-randomly.

13. The method of claim 1, wherein the frequency hopping pattern is assigned based on an assignment scheme that accounts for other frequency hopping pattern assignments.

2-10. -10. (canceled)

14. A method for dynamic channel assignment in a time division multiple access (TDMA) scheme, comprising:

obtaining an average energy within a predetermined frequency range for each of a plurality of time slots;

electing a time slot based on a comparison of average energies corresponding to the time slots;

assigning a selected time slot; and

assigning a frequency hopping pattern for use within the selected time slot.

15. A method for dynamic channel assignment in a time division multiple access (TDMA) scheme, comprising:

sweeping a narrow band filter through a predetermined frequency range to measure an average energy for each of a plurality of time slots;

selecting a time slot based on a comparison of average energies corresponding to the time slots;

assigning a selected time slot; and

assigning a frequency hopping pattern for use within the selected time slot.

16. A dynamic channel assignment device operating in a time division multiple access (TDMA) scheme, comprising:

an I/O interface;

a controller coupled to the I/O interface, the controller first assigning a time slot; and

then assigning a frequency hopping pattern; and

an energy measuring device, the energy measuring device measuring noise levels of time slots across a predetermined frequency range, the controller selecting a time slot that has an acceptable noise level as the selected time slot for assignment.

23. The device of claim 16, wherein the frequency hopping pattern is assigned independently from other frequency hopping pattern assignments.

24. The device of claim 23, wherein the frequency hopping pattern is assigned pseudo-randomly.

25. The device of claim 16, wherein the frequency hopping pattern is assigned based on an assignment scheme that accounts for other frequency hopping pattern assignments.

17-22. -22. (canceled)

26. A dynamic channel assignment device operating in a time division multiple access (TDMA) scheme, comprising:

a controller; and

an energy measuring device that obtains an average energy within a predetermined frequency range for each of a plurality of time slots, the controller selecting a time slot based on a comparison of average energies corresponding to the time slots, assigning a selected time slot, and assigning a frequency hopping pattern for use within the selected time slot.

27. A device that performs dynamic channel assignment in a time division multiple access (TDMA) scheme, comprising:

a narrow band filter that sweeps through a predetermined frequency range to measure an average energy for each of a plurality of time slots; and

a time slot selection device coupled to the narrow band filter that selects a time slot based on a comparison of average energies corresponding to the time slots, assigns a selected time slot; and

a frequency hopping pattern assigning device that assigns a frequency hopping pattern for use within the selected time slot.

28. The device of claim 27, further comprising:

a measured energy to time slot accumulator that accumulates measured energy to time slots that are measured across multiple time frames.

29. The device according to claim 28, wherein the frequency hopping pattern assigning device assigns hopping patterns independently from other hopping pattern assignments.

30. The device according to claim 29, wherein the frequency hopping pattern assigning device assigns pseudo-random hopping patterns.

31. (canceled)