| 主权项 |
1. A method, comprising:
selecting at least one extended preamble from cyclically shifted sequences of a Zadoff-Chu root sequence, wherein the selected at least one extended preamble is to be used in an uplink random access request and each selected extended preamble is the result of a selected cyclic shift which corresponds to cyclic shift -specific timing uncertainty windows, each having a predefined length, wherein: the cyclic shift -specific timing uncertainty windows of each extended preamble comprise at least a first window including at least the selected cyclic shift, a second and a third window corresponding to frequency cyclic shifts of +1 or −1 of the first window, respectively, and a fourth and a fifth window corresponding to frequency cyclic shifts of +2 or −2 of the first window, respectively; and any of the cyclic shift -specific timing uncertainty windows of the selected extended preamble do not overlap with one other or with any timing uncertainty window of any other preamble using the same Zadoff-Chu root sequence, wherein cell-specific preamble sequences available for use in the uplink random access comprises two separate sets: a first set comprising only at least one non-extended preamble, wherein, in the selection of the at least one non-extended preamble, at least the fourth window and the fifth window are not comprised in the timing uncertainty windows, and a second set comprising only the at least one extended preamble; the method further comprising performing at least one of the following: applying different Zadoff-Chu root sequences for the second set and for the non-extended preambles of the first set which are reserved for a contention based random access in order to allow transmitting the random access request carrying a preamble sequence selected from the first set in a same resource unit as the random access request carrying a preamble sequence selected from the second set, and transmitting the random access request carrying a preamble sequence selected from the first set in a different resource unit than the random access request carrying a preamble sequence selected from the second set, wherein the resource unit comprises telecommunication transmission resources and wherein the random access request is transmitted using the telecommunication transmission resources. |
