Methods and apparatus for random access in multi-carrier communication systems
AssigneeNeocific, Inc.
InventorsXiaodong Li, Titus Lo, Kemin Li, Haiming Huang
Life of this patent
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Abstract
Methods and apparatus in a multi-carrier cellular wireless network with random access improve receiving reliability and reduce interference of uplink signals of a random access, while improving the detection performance of a base station receiver by employing specifically configured ranging signals.
Claims12
In a multiple access wireless communication system having a plurality of base stations covering a plurality of cells, a method by a base station to communicate with a mobile station over a random access subchannel, the method comprising:
- allocating, within a communication channel, a random access (RA) subchannel selected from a plurality of frequency subchannels and a RA time slot selected from a plurality of time slots, the RA time slot and RA subchannel associated with the cell in which the base station is located;
- receiving a signal from a mobile station over the selected RA subchannel in the selected RA time slot;
- and
- detecting a presence of an RA signal in the received signal by:
- applying a Fast Fourier Transform (FFT) to the received signal to generate a transformed signal in the frequency domain;
- computing, in the frequency-domain, a correlation between the transformed signal and an RA sequence specific to the cell in which the base station is located;
- and
- analyzing the computed frequency-domain correlation to detect the RA signal.
In a multiple access wireless communication system having a plurality of base stations covering a plurality of cells, a base station configured to communicate with a mobile station over a random access subchannel, the base station comprising:
- an apparatus configured to allocate, within a communication channel, a random access (RA) subchannel selected from a plurality of frequency subchannels and a RA time slot selected from a plurality of time slots, the RA time slot and RA subchannel associated with the cell in which the base station is located;
- a receiver configured to receive a signal from a mobile station over the selected RA subchannel in the selected RA time slot;
- and
- a processing component configured to detect a presence of an RA signal in the received signal by:
- applying a Fast Fourier Transform (FFT) to the received signal to generate a transformed signal in the frequency domain;
- computing, in the frequency-domain, a correlation between the transformed signal and an RA sequence specific to the cell in which the base station is located;
- and
- analyzing the computed frequency-domain correlation to detect the RA signal.
Dependencies are inferred from the claim text.