Wireless base station apparatus and system to avoid preamble interference
First Claim
1. A radio base-station apparatus for performing OFDMA multiple-access processing in a cell divided into a plurality of sectors, comprising:
- a plurality of radio base-station devices, each radio base-station device associated with one of the sectors and includinga physical layer processing block that forms frames with logical subchannel numbers and OFDMA symbol numbers used for transmission and reception, anda transmitter/receiver block that transmits the frames, whereineach of the radio base-station devices operates on a same radio frequency with a frequency reuse factor of 1,each of the frames includes a preamble and frame control information arranged sequentially at a beginning of the respective frame, andwhen each of the radio base-station devices operates on the same radio frequency with the frequency reuse factor of 1, the radio base-station devices transmit the frames such that the preambles and frame control information of the frames do not interfere with each other between the frames and that beginnings of data regions of the frames on the OFDMA symbol numbers coincide with each other.
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Accused Products
Abstract
A radio base-station apparatus with improved frame transmission efficiency by avoiding interference of preambles and frame control information between sectors of a cell or between cells with a frequency reuse factor. In the apparatus OFDMA multiple-access processing is performed for each of a plurality of sectors of a cell, and frames made of logical subchannel numbers and OFDMA symbol numbers are configured in synchronization respectively for the plurality of sectors, and offsets are added to the beginnings of given frames such that the preambles and frame control information arranged sequentially from the beginnings of the frames do not overlap on the OFDMA symbol numbers.
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Citations
12 Claims
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1. A radio base-station apparatus for performing OFDMA multiple-access processing in a cell divided into a plurality of sectors, comprising:
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a plurality of radio base-station devices, each radio base-station device associated with one of the sectors and including a physical layer processing block that forms frames with logical subchannel numbers and OFDMA symbol numbers used for transmission and reception, and a transmitter/receiver block that transmits the frames, wherein each of the radio base-station devices operates on a same radio frequency with a frequency reuse factor of 1, each of the frames includes a preamble and frame control information arranged sequentially at a beginning of the respective frame, and when each of the radio base-station devices operates on the same radio frequency with the frequency reuse factor of 1, the radio base-station devices transmit the frames such that the preambles and frame control information of the frames do not interfere with each other between the frames and that beginnings of data regions of the frames on the OFDMA symbol numbers coincide with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification