Dynamic channel assignment

• US 7,457,259 B2
• Filed: 09/01/2005
• Issued: 11/25/2008
• Est. Priority Date: 03/22/2000
• Status: Expired due to Term

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Chang, Li Fung, Qiu, Xiaoxin, Chawla, Kapil K., Chuang, Justin Che-I, McNair, Bruce Edwin
• Primary Examiner(s): Sam; Phirin
• Application Number:
  US11/217,045
• Publication Number:
  US 20050286467A1
• Time in Patent Office: 1,181 Days
• Field of Search: None
• US Class Current: 370/317
• 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:

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.

2. 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.

3. The device of claim 2, further comprising:

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

4. The device according to claim 3, wherein the frequency hopping pattern assigning device assigns hopping patterns independently from other hopping pattern assignments.

5. The device according to claim 4, wherein the frequency hopping pattern assigning device assigns pseudo-random hopping patterns.