System and method for uplink rate selection

• US 20060105796A1
• Filed: 02/14/2003
• Published: 05/18/2006
• Est. Priority Date: 02/14/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Zhang, Xiaoxia, Willenegger, Serge, Malladi, Durga
• Granted Patent: US 7,493,132 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0034 where the transmitter decides based on inferences, e.g. use of implicit signalling
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 1/1816 with retransmission of the same, encoded, message
• CPC Class Codes: H04L 1/203 Details of error rate determination, e.g. BER, FER or WER
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

Techniques are provided herein to mitigate the effects of link imbalance for the uplink between a terminal (or UE) and multiple base stations (or Node Bs). An uplink transmission rate is selected based on an adjusted nominal uplink transmission rate and the difference between power control commands from different nodes.

Claims

1. A method of selecting an uplink transmission rate in a wireless communications system, comprising:

receiving a nominal uplink transmission rate;

determining a difference value based on a first set of power control commands and a second set of power control commands; and

selecting an uplink transmission rate based on the nominal uplink transmission rate and the difference value.

2. The method of claim 1, wherein the length of the first set of power control commands and the length of the second set of power control commands is n.

3. The method of claim 1, wherein the first set of power control commands is from a serving node and a second set of power control commands is from a node having a best uplink transmission signal-to-noise-and-interference ratio (SNR).

4. The method of claim 1, wherein the difference value is determined by:

assigning a power control value to each power control command in the first set of power control commands and assigning a power control value to each power control command in the second set of power control commands;

summing the power control values of the first set of power control values, creating a first sum;

summing the power control values of the second set of power control values, creating a second sum; and

calculating the difference between the first sum and the second sum.

5. The method of claim 4, further comprising translating the difference between the first sum and the second sum into a difference gain value.

6. A terminal in a wireless communications system, comprising:

means for receiving a nominal uplink transmission rate;

means for determining a difference value based on a first set of power control commands and a second set of power control commands; and

means for selecting an uplink transmission rate based on the nominal uplink transmission rate and the difference value.

7. The terminal of claim 6, further comprising means for receiving the first set of power control commands from a serving node and receiving the second set of power control commands from a node having the best uplink transmission SNR.

8. A memory communicatively coupled to a terminal capable of interpreting digital information to:

receive a nominal uplink transmission rate;

determine a difference value based on a first set of power control commands and a second set of power control commands; and

select an uplink transmission rate based on the nominal uplink transmission rate and the difference value.