Channel selection for uplink access

摘要

Systems, methods, and instrumentalities are disclosed for a wireless transmit/receive unit (WTRU) to transmit uplink information. The WTRU may have information such as data or control information to transmit to a network. The (WTRU) may request a common enhanced dedicated channel (E-DCH) resource from the network. The WTRU may receive an indication from the network to fallback using a random access channel, e.g. a Release 99 Random Access Channel (R99 RACH), a Release 99 Physical Random Access Channel (R99 PRACH), etc. The indication may be received via an acquisition indicator (E-AI). The indication may be a value of the E-AI. The WTRU may determine whether a condition is met. The WTRU may transmit the uplink information over the R99 PRACH if the condition is met.

主权项

1. A method to transmit uplink information, the method comprising:
requesting, by a wireless transmit/receive unit (WTRU), a common enhanced dedicated channel (E-DCH) resource from a network utilizing a preamble reserved for fallback to a Release 99 Physical Random Access Channel (R99 PRACH); receiving an indication from the network to fallback to R99 PRACH, wherein the indication is received via an acquisition indicator (E-AI); determining whether a condition is met, wherein the condition is met if the WTRU has data to transmit on a channel configured for fallback to R99 PRACH, and wherein the channel configured for fallback to R99 PRACH is a common control channel (CCCH) or a dedicated control channel (DCCH); and transmitting the uplink information over the R99 PRACH if the condition is met.