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1. US20170359839 - Method and apparatus for random access preamble detection

Office
United States of America
Application Number 15542769
Application Date 06.02.2015
Publication Number 20170359839
Publication Date 14.12.2017
Grant Number 10420149
Grant Date 17.09.2019
Publication Kind B2
IPC
H04W 4/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
4Services specially adapted for wireless communication networks; Facilities therefor
H04W 74/08
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
74Wireless channel access, e.g. scheduled or random access
08Non-scheduled access, e.g. random access, ALOHA or CSMA
H04J 13/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
13Code division multiplex systems
H04L 1/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
1Arrangements for detecting or preventing errors in the information received
H04J 11/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
11Orthogonal multiplex systems
CPC
H04J 13/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
13Code division multiplex systems
H04W 74/0833
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
74Wireless channel access, e.g. scheduled or random access
08Non-scheduled ; or contention based; access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
0833using a random access procedure
H04L 1/0029
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
1Arrangements for detecting or preventing errors in the information received
0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
0023characterised by the signalling
0028Formatting
0029Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
H04J 11/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
JMULTIPLEX COMMUNICATION
11Orthogonal multiplex systems, ; e.g. using WALSH codes
Applicants Telefonaktiebolaget LM Ericsson (publ)
Inventors Jianfeng Wang
Henrik Sahlin
Huaisong Zhu
Agents Sage Patent Group
Title
(EN) Method and apparatus for random access preamble detection
Abstract
(EN)

Embodiments of the present disclosure provide a method in a base station for random access preamble detection. The method comprises determining a frequency offset of a received uplink signal and adjusting the received uplink signal with the determined frequency offset. The method also comprises detecting, from the adjusted uplink signal, whether there is a random access preamble with a first false alarm value. Additionally, the method may further comprise detecting from the received uplink signal, whether there is a random access preamble with a second false alarm value, before determining the frequency offset of the received uplink signal. Determining the frequency offset of the received uplink signal may be performed in response that a random access preamble is detected with the second false alarm value, the second false alarm value being higher than the first false alarm value.