Patent ID: 8989117
Filing Date: 2015-03-24
Classification: H04L,H04W

Abstract:
1. A method, in a mobile terminal, for accessing uplink resources in a wireless network that supports an enhanced-uplink random-access procedure for accessing enhanced-uplink resources and a fallback random-access procedure for access to fallback random-access resources the method comprising: selecting a transmission-time interval (TTI) from two or more possible TTIs; selecting a preamble signature from a group of one or more preamble signatures associated with enhanced-uplink resources and associated with the selected TTI; transmitting a random-access channel (RACH) preamble, using the selected preamble signature; receiving a negative acknowledgement indicator corresponding to the selected preamble signature; receiving an extended acknowledgement indicator value; determining that the received extended acknowledgement indicator value is signaling a fallback to fallback random-access resources; and initiating a fallback random-access procedure, using a preamble signature selected from a group of one or more preamble signatures corresponding to the fallback random-access resources.