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1. (WO2013110331) UPLINK CHANNEL FOR WIRELESS COMMUNICATION

Pub. No.:    WO/2013/110331    International Application No.:    PCT/EP2012/051144
Publication Date: Fri Aug 02 01:59:59 CEST 2013 International Filing Date: Thu Jan 26 00:59:59 CET 2012
IPC: H04L 5/00
Applicants: FUJITSU LIMITED
WEBB, Matthew
TESANOVIC, Milos
MOULSLEY, Timothy
FANG, Yiwei
Inventors: WEBB, Matthew
TESANOVIC, Milos
MOULSLEY, Timothy
FANG, Yiwei
Title: UPLINK CHANNEL FOR WIRELESS COMMUNICATION
Abstract:
A new random access (RA) procedure designed for a scenario where a large number of low-cost and low-capability LTE devices are deployed within a coverage area. After an initial, contention-based RA procedure, the network assigns the UE fixed PRACH resources in time (and possibly frequency) and a fixed RA preamble for use in future RA procedures. The RA preambles are therefore multiplexed in time, increasing their effective number. The eNodeB maintains a list of UE identity to preamble+resources associations and is thus able to identify which UE is accessing PRACH in a given subframe. To allow a UE to indicate that it is suitable for inclusion in this new procedure, a means of using the RA procedure to transmit information earlier in the access procedure is designed. The set of all permissible preambles is partitioned and each partition is associated with a particular state of the UE with respect to the information it wishes to transmit. To indicate its state, the UE chooses a preamble in the initial contention-based RA procedure from the relevant partition, rather than at random. The eNodeB is able similarly to indicate information to the UE by its choice of preamble+resource in the new RA procedure.