Transmission and Reception of a Random Access Preamble Signal

Abstract

A method performed in a preamble transmitter for transmitting a preamble sequence, the method comprising the steps of generating S11 a short sequence s(n), the short sequence having the same time duration as an OFDM symbol used for carrying data traffic in a radio access network of the preamble transmitter, constructing S12 a preamble sequence by concatenating a plurality of said short sequences in time, and transmitting S13 the constructed preamble sequence as a radio signal to a preamble receiver.

1 . A user equipment comprising:
 processing circuitry configured to:
 generate a time-continuous short sequence; 
 construct a preamble sequence by concatenating a plurality of the short sequences in time, wherein the short sequence has a same time duration as an orthogonal frequency division multiplexing (OFDM) symbol used for carrying data traffic in a radio access network of the user equipment; 
   a transmitter circuit configured to transmit the generated preamble sequence as a radio signal.   
     
     
         2 . The user equipment of  claim 1 , wherein the transmitter circuit is configured to transmit the preamble sequence over a Physical Random Access Channel (PRACH) of the radio access network. 
     
     
         3 . The user equipment of  claim 1 , wherein the short sequence used to construct the preamble sequence is a cyclic prefix for neighboring short sequences. 
     
     
         4 . The user equipment of  claim 1 , wherein the short sequence comprises a Zadoff-Chu sequence. 
     
     
         5 . A method, performed in a user equipment, for transmitting a preamble sequence, the method comprising:
 generating a short sequence, the short sequence having a same time duration as an Orthogonal Frequency-Division Multiplexing (OFDM) symbol used for carrying data traffic in a radio access network of the user equipment;   constructing a preamble sequence by concatenating a plurality of the short sequences in time; and   transmitting the constructed preamble sequence as a radio signal to a preamble base station.   
     
     
         6 . A computer program product stored in a non-transitory computer readable medium for controlling a user equipment to transmit a preamble sequence, the computer program product comprising software instructions that, when run on processing circuitry of the user equipment, causes the user equipment to:
 generate a short sequence, the short sequence having a same time duration as an Orthogonal Frequency-Division Multiplexing (OFDM) symbol used for carrying data traffic in a radio access network of the user equipment;   construct a preamble sequence by concatenating a plurality of the short sequences in time; and   transmit the constructed preamble sequence as a radio signal to a preamble base station.