System, method and apparatus for identification of power control using reverse rate indication

• US 20080160990A1
• Filed: 12/31/2007
• Published: 07/03/2008
• Est. Priority Date: 12/29/2006
• Status: Abandoned Application

• Current Assignee: Google Inc. (Alphabet Inc.)
• Original Assignee: Google Inc. (Alphabet Inc.)
• Inventors: Karmi, Yair
• Application Number:
  US12/003,781
• Publication Number:
  US 20080160990A1
• Time in Patent Office: Days
• US Class Current: 455/424
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/267 taking into account the information rate

Abstract

A method, system and apparatus for determining power control signals, for example, power control bits received by a mobile station. Some applications requiring power control information may not have access to the baseband processor, which may decode the relevant information sent by the base station. According to embodiments of the invention, power control information may be determined or at least estimated with a degree of reliability by reading the total power transmitted by the mobile station and the data rate of the transmission.

Claims

1. A method of determining at least one power control signal received by a mobile communication device from a base station comprising:

measuring total power of an uplink transmission sent by said mobile communication device;

measuring a data rate of said uplink transmission; and

determining a power control signal based on said total power and said data rate.

2. The method of claim 1, wherein said mobile communication device sends said uplink transmission using a type of protocol selected from the group consisting of:

Evolution-Data Optimized (EvDO) and Wideband Code Division Multiple Access (WCDMA).

3. The method of claim 1, further comprising determining a change between total power of said uplink transmission and total power of a previous uplink transmission, wherein determining said power control signal comprises determining said power control signal based on said change in total power and said data rate.

4. The method of claim 1, further comprising determining a change between data rate of said uplink transmission and data rate of a previous uplink transmission, wherein determining said power control signal comprises determining said power control signal based on said total power and said change in data rate.

5. The method of claim 1, wherein measuring a data rate of said uplink transmission comprises determining a reverse rate indicator (RRI) of said uplink transmission and wherein determining said power control signal comprises determining said power control signal based on said total power and said RRI.

6. The method of claim 1, wherein measuring a data rate of said uplink transmission comprises determining a plurality of reverse rate indicators (RRMs), and determining said data rate of said uplink transmission based on said plurality of RRIs.

7. The method of claim 6, wherein determining said data rate of said uplink transmission based on said plurality of RRIs comprises:

testing a first hypothesized data rate using said plurality of RRIs; and

if said first hypothesized data rate does not correspond to said plurality of RRIs, then testing a second hypothesized data rate using said plurality of RRIs.

8. The method of claim 7, wherein testing said first hypothesized data rate comprises determining whether said hypothesized data rate would produce a change in total power corresponding to said measured total power of said uplink transmission.

9. The method of claim 1, further comprising modifying a transmit diversity parameter based on said determined power control signal.

10. The method of claim 9, wherein said transmit diversity parameter is selected from the group consisting of phase difference and relative power of a plurality of transmit paths of said mobile communication device.