Raising random access channel packet payload

• US 20040131033A1
• Filed: 10/20/2003
• Published: 07/08/2004
• Est. Priority Date: 05/19/1999
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Zeira, Eldad, Dick, Stephen G.
• Granted Patent: US 7,508,807 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A data packet is provided for transmission having a first processing gain for reception at a first power level or higher. The data packet is modified prior to transmission such that the data packet has a preamble wherein data in the preamble has a second processing gain higher than the first processing gain for reception at a second power level lower than the first power level or higher. The user equipment unit transmits the modified data packet over the random access channel at a power level such that the modified data packet is initially received at the base station at at least the second power level. The transmission power level is adaptively controlled while the preamble data is transmitted such that the base station receives the data of the data packet having the first processing gain at least the first power level.

Claims

1. A data packet for transmission over a random access channel within a wireless spread spectrum code division multiple access communication system, the data packet comprising:

a preamble portion and a non-preamble portion, each having an associated processing gain;

wherein the preamble portion processing gain is higher than the non-preamble portion processing gain.

2. The data packet of claim 1 wherein the preamble and non-preamble error encoding gains.

3. The data packet of claim 1 wherein the preamble and non-preamble error encoding gains are a result of processing the data packet with a first and second convolutional encoder, respectively.

4. The data packet of claim 3 wherein the first convolutional encoder is a ⅞

convolutional encoder and the second convolutional encoder is a convolutional encoder in the range of a ⅓

to ½

convolutional encoder.

5. The data packet of claim 1 wherein the preamble processing gain is a first spreading factor and the non-preamble processing gain is a second spreading factor.

6. The data packet of claim 1 wherein the random access channel is a common packet channel.