Method and apparatus to allocate radio resources for transmitting a message part in an enhanced RACH

Abstract

A method and apparatus for allocating resources to a wireless transmit receive unit (WTRU) includes the WTRU transmitting a signature sequence, receiving an acknowledge signal in response to the signature sequence, and determining a default resource index. The resource index is associated with enhanced dedicated channel (E-DCH) parameters.

Description

Technical field This application relates to wireless communication. Background technique In many cellular communication systems, radio resource access is controlled through the radio network. When a wireless transmit / receive unit (WTRU) has data to send to the network, radio resource access is required before sending its data payload. In order to achieve this in a 3rd Generation Partnership Project (3GPP) network, for example, the WTRU must obtain access to the Random Access Channel (RACH). Access to RACH is controversial and there is a mechanism to reduce the chance of collision, that is, when two WTRUs access the resource at the same time. The process used for random access includes a preamble phase, which has a power ramp up, followed by channel acquisition information and message transmission. Due to the controversial nature of RACH, in order to avoid the WTRU occupying shared radio resources for a long time, and because there is no power control, relatively short messag...

AI Technical Summary

Problems solved by technology

However, the difficulty lies in the low data rate provided by the existing RACH

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