Method for acquiring format of random access subframe and receiver

摘要

A method for acquiring a format of a random access subframe and a receiver are provided. The method includes: according to a cell radius supported currently and a cell coverage radius decided by the length of ZC sequence and the size of Ncs, a receiver determining the length of preamble sequence in an extended random access subframe; according to the cell radius supported currently and a cell coverage radius decided by the length of GT, determining the lengths of CP and GT in the extended random access subframe; according to sampling rates of a system where the receiver is located and the lengths of the preamble sequence and CP and GT, respectively calculating the numbers of sampling points of preamble sequence and GT and CP; based on the above numbers of sampling points, calculating the length of extended random access subframe, and determining the format of extended random access subframe.

主权项

1. A method for acquiring a format of a random access subframe, comprising:
a receiver determining the length of a preamble sequence in an extended random access subframe according to a cell radius required to be supported currently and a cell coverage radius decided by the length of a ZC sequence and the size of a cyclic shift (Ncs); the receiver determining the length of a Cyclic Prefix (CP) and the length of a Guard Time (GT) in the extended random access subframe according to the cell radius required to be supported currently and a cell coverage radius decided by the length of the GT; the receiver respectively calculating the number of sampling points of the preamble sequence, the number of sampling points of the GT and the number of sampling points of the CP according to a sampling rate of a system in which the receiver is located, the length of the preamble sequence, the length of the CP and the length of the GT; and the receiver calculating the length of the extended random access subframe according to the number of sampling points of the preamble sequence, the number of sampling points of the GT and the number of sampling points of the CP, and determining a format of the extended random access subframe; wherein: the step of the receiver determining the length of a CP and the length of a GT in the extended random access subframe according to the cell radius required to be supported currently and a cell coverage radius decided by the length of the GT comprises: the receiver determining the length of the GT in the extended random access subframe according to the cell radius required to be supported currently and the cell coverage radius decided by the length of the GT; and determining the length of the CP according to the length of the GT and a difference between the length of the CP and the length of the GT being less than or equal to a value of preset length, wherein the length of the CP is greater than the length of the GT.