Patent ID: 7778151
Filing Date: 2010-08-17
Classification: H04J,H04L

Abstract:
1. A method for transmitting a contention free scheduling request in a cellular network, comprising: defining a set of N frequency opportunities within a scheduling request slot; defining a set of R CAZAC root sequences per frequency opportunity; defining a set of C cyclic shifts per CAZAC root sequence; assigning within a cell a unique identification number to each of a plurality of user equipment (UE); mapping each UE of the plurality of UE to a unique combination of one of the N frequency opportunities, one of the R CAZAC root sequences and one of the C cyclic shifts; and transmitting a cyclic shifted preamble sequence for a given UE as a scheduling request on the mapped frequency, CAZAC root sequence and cyclic shift opportunity, wherein the unique identification number of the given UE is encoded by the combination of the frequency opportunity, CAZAC root sequence opportunity, and amount of cyclic shift, such that up to all of the plurality of UE can transmit a schedule request (SR) in a non-contentious manner in one schedule request slot.