Method of estimating a current channel condition in a wireless communications network

• US 8,965,440 B2
• Filed: 05/31/2005
• Issued: 02/24/2015
• Est. Priority Date: 05/31/2005
• Status: Expired due to Fees

• Current Assignee: RPX Corporation
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Dominique, Francis, Nabhane, Walid E., Kong, Hongwel
• Primary Examiner(s): Nguyen, Hai V
• Application Number:
  US11/139,693
• Publication Number:
  US 20060270432A1
• Time in Patent Office: 3,556 Days
• Field of Search: 455/522
• US Class Current: 455/522
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04W 52/58 Format of the TPC bits

Abstract

In the method, a current channel condition is estimated based at least in part on a previous channel quality indicator and power control information received after the previous channel quality indicator.

Claims

1. A method of estimating a current channel condition, comprising:

receiving, at a network element, a first channel quality indicator; and

generating, at the network element, a current channel quality estimate based on the first channel quality indicator and a summation of power control information, the power control information included in the summation being only power control information that is received over at least two transmission power control intervals, the at least two transmission power control intervals occurring between receipt of the first channel quality indicator and receipt of a next channel quality indicator.

2. The method of claim 1, wherein the power control information indicates whether to increase or decrease a transmission power.

3. The method of claim 2, wherein the increase or decrease to the transmission power is based on a given increment amount.

4. The method of claim 2, wherein the power control information includes at least one transmit power control bit.

5. The method of claim 4, wherein the increase or decrease to the transmission power is based on a given increment amount.

6. The method of claim 1, further comprising:

adjusting a downlink transmission parameter on a downlink channel based on the generated current channel quality estimate.

7. The method of claim 6, wherein the downlink transmission parameter includes a downlink transmission power and the adjusting step increases or decreases the downlink transmission power on the downlink channel.

8. The method of claim 6, wherein the downlink transmission parameter includes a data encoding parameter and the adjustment step increases or decreases the level of encoding on the downlink channel.

9. The method of claim 6, wherein the downlink channel includes at least one of a High Speed Downlink Shared Channel and a High Speed Physical Downlink Shared Channel.

10. The method of claim 1, wherein the current channel quality indicator is received on an uplink channel.

11. The method of claim 10, wherein the uplink channel is a High Speed Dedicated Physical Control Channel in accordance with 3GPP-UMTS.

12. The method of claim 1, wherein the power control information is received on an uplink channel.

13. The method of claim 12, wherein the uplink channel is a Dedicated Physical Control Channel.

14. The method of claim 1, wherein said summation over at least two transmission power control intervals includes summation, for a given interval, in respect to a product of a given transmission power control command and a corresponding downlink power adjustment factor for the given power control command.