Method for detecting radio link failure for transmission over enhanced dedicated channel in CELL_FACH state

Abstract

A method and apparatus are used for detecting a radio link (RL) failure and a post verification process. A quality of a downlink fractional dedicated physical channel (F-DPCH) is monitored once a transmission on an enhanced dedicated channel (E-DCH) has begun. It is determined whether the quality of the downlink F-DPCH is below a predefined threshold. If the quality is below the predefined threshold, then an occurrence of an RL failure is declared and a transmission over the E-DCH in a cell forward access channel (CELL_FACH) state is terminated. In a case of the post verification failure, E-DCH resources are released.

Description

technical field

[0001] This application relates to wireless communications. Background technique

[0002] As part of the ongoing evolution of the Wideband Code Division Multiple Access (WCDMA) standard in Release 8 of the 3rd Generation Partnership Project (3GPP) standard, a new work item has been created to incorporate enhanced A dedicated channel (E-DCH) is combined for a wireless transmit receive unit (WTRU).

[0003] Figure 1 shows the radio resource control (RRC) service states of a 3GPP WTRU with enhanced uplink (UL). A WTRU may operate in multiple states depending on user activity. The following states have been defined: Idle (IDLE), Cell Dedicated Channel (CELL_DCH), Cell Forward Access Channel (CELL_FACH), Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN) Registration Area Paging Channel ( URA_PCH), and the cell paging channel (CELL_PCH). RRC state transitions are controlled by the network using radio network controller (...

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