RADIO COMMUNICATION SYSTEM, BASE STATION AND RANDOM ACCESS CHANNEL TRANSMISSION METHOD THEREOF
First Claim
1. A random access channel transmission method, comprising steps of:
- selecting a preamble pattern from among a plurality of known preamble patterns in a user terminal; and
transmitting that preamble pattern to a base station from the user terminal, whereina user terminal that exists in an area close to the base station repeats a first preamble pattern M number of times and transmits the preamble generated by the repetition, and a user terminal that exists in an area far from the base station repeats a second preamble pattern N (M<
N) number of times and transmits the preamble generated by the repetition.
1 Assignment
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Accused Products
Abstract
A random access channel transmission method in which a user terminal selects a preamble pattern from among a plurality of known preamble patterns and transmits that preamble pattern to a base station, where that transmission method comprises: a step of dividing a cell into a plurality of areas, and setting one or more preamble patterns and the number of repetitions for transmitting the preamble pattern for each area; and a step wherein a user terminal that exists in an are close to the base station transmits a specified preamble pattern one time, and a user terminal that exists in an area far from the base station transmits another specified preamble pattern a plurality of times.
104 Citations
22 Claims
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1. A random access channel transmission method, comprising steps of:
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selecting a preamble pattern from among a plurality of known preamble patterns in a user terminal; and transmitting that preamble pattern to a base station from the user terminal, wherein a user terminal that exists in an area close to the base station repeats a first preamble pattern M number of times and transmits the preamble generated by the repetition, and a user terminal that exists in an area far from the base station repeats a second preamble pattern N (M<
N) number of times and transmits the preamble generated by the repetition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A base station of a radio communication system in which a user terminal selects one preamble pattern from among a plurality of known preamble patterns and transmits that preamble pattern to the base station, comprising:
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broadcast means for broadcasting to the user terminals, a plurality of preamble patterns and a number of repetitions for transmitting repeatedly each of the preamble patterns; preamble detection means for detecting a preamble pattern that is transmitted from a user terminal; and transmission means for creating and transmitting preamble reception confirmation information to the user terminal in a case where said preamble pattern is received. - View Dependent Claims (14, 15, 16, 17)
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18. A radio communication system in which a user terminal selects one preamble pattern from among a plurality of known preamble patterns and transmits that preamble pattern to a base station, wherein
the base station comprises: -
broadcast means for dividing a cell into a plurality of areas, setting one or more preamble patterns for each area and the number of repetitions for transmitting repeatedly each of the preamble patterns, and broadcasting the set information to user terminals; preamble detection means for detecting a preamble pattern that is transmitted from a user terminal; and transmission means for creating and transmitting preamble reception confirmation information to the user terminal when said preamble pattern is received; and the user terminal comprises; a memory unit that saves broadcast information that is transmitted from the base station; area detection means for detecting the area where that user terminal exists; a preamble pattern selection unit that selects a preamble pattern that corresponds to the area from the broadcast information stored in said memory unit; and a preamble transmission unit that generates the preamble pattern and transmits the preamble pattern repeatedly the number of repetitions. - View Dependent Claims (19, 20, 21, 22)
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Specification