RADIO COMMUNICATION SYSTEM
First Claim
1. A radio communication system in which communication is carried out between a terminal and a base station through any of the predetermined number of random access slots, whereinthe base station subjects a received access signal to CRC error judgment and signal-to-noise ratio judgment, andwhen the CRC error judgment yields a code error, and when the signal-to-noise ratio is greater than a prescribed reference value, the base station determines that there is collision of random access between a plurality of terminals.
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Accused Products
Abstract
A radio communication system in which radio communication is carried out between a terminal and a base station through any of the predetermined number of random access slots. The radio communication system includes a base station which subjects a received access signal to CRC error judgment and signal-to-noise ratio judgment. When the CRC error judgment yields a code error, and when the signal-to-noise ratio is greater than a prescribed reference value, the radio communication system judges that there is collision of random access between a plurality of terminals. The communication system avoids a state in which communication cannot be established, and which arises when collision detection and a transmission reset function are not added to RACH in LTE.
12 Citations
10 Claims
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1. A radio communication system in which communication is carried out between a terminal and a base station through any of the predetermined number of random access slots, wherein
the base station subjects a received access signal to CRC error judgment and signal-to-noise ratio judgment, and when the CRC error judgment yields a code error, and when the signal-to-noise ratio is greater than a prescribed reference value, the base station determines that there is collision of random access between a plurality of terminals.
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2. A radio communication system in which communication is carried out between a terminal and a base station through any of the predetermined number of random access slots, wherein
the base station subjects a received access signal to CRC error judgment and generation of a power profile of the received access signal, and when the CRC error judgment yields a code error, and when a delay spread of the power profile is wider than a prescribed reference value, the base station judges that there is collision of random access between a plurality of terminals.
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7. A base station in a radio communication system in which communication is carried out between a terminal and a base station through any of the predetermined number of random access slots, the base station comprising:
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an error judgment circuit to subject a received access signal to CRC error judgment; a circuit to determine a signal-to-noise ratio of the received signal when the CRC error judgment in the error judgment circuit yields a code error; and a collision judgment circuit to judge that there is collision of random access between a plurality of terminals when the signal-to-noise ratio determined by the circuit to determine the signal-to-noise ratio of the received signal is greater than a prescribed reference value. - View Dependent Claims (9, 10)
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8. A base station in a radio communication system in which communication is carried out between a terminal and a base station through any of the predetermined number of random access slots, the base station comprising:
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an error judgment circuit to subject a received access signal to CRC error judgment; a circuit to generate a power profile of the received signal when the CRC error judgment in the error judgment circuit yields a code error; and a collision judgment circuit to judge that there is collision of random access between a plurality of terminals when delay spread in the power profile generated by the circuit to generate a power profile is wider than a reference value.
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Specification