RADIO TRANSMISSION DEVICE, AND RADIO TRANSMISSION METHOD
First Claim
1. A radio transmitting apparatus comprising:
- an estimation section that estimates an amount of propagation delay based on a downlink signal;
a selection section that provides in advance cyclic shift values for cyclically shifting the code sequences used for signatures to include a random access channel in association with amounts of propagation delay, and selects a signature generated from a code sequence using a cyclic shift value associated with the estimated amount of propagation delay;
a generating section that generates a random access channel signal including the selected signature; and
a transmission section that transmits the generated random access channel signal.
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Accused Products
Abstract
Provided are a radio transmission device and a radio transmission method, which prevent the deterioration of a preamble detecting performance while reducing the collision probability of a RACH. In this radio transmission device, a Signature table storage unit (103) divides the magnitudes of transmission loss levels into individual levels corresponding to the distances from a base station, to cause CAZAC series and circulation shift quantities to correspond to each other at the individual levels, and is provided with a table containing a plurality of Signatures created from the CAZAC series and the circulation shift quantities caused to correspond to each other. A Signature selecting unit (104) selects one of the corresponding Signatures at random from the Signature table storage unit (103), on the basis of the magnitude of the transmission loss level outputted from a transmission loss level deciding unit (102). A RACH signal generating unit (105) generates the RACH signal with the Signature selected.
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Citations
12 Claims
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1. A radio transmitting apparatus comprising:
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an estimation section that estimates an amount of propagation delay based on a downlink signal; a selection section that provides in advance cyclic shift values for cyclically shifting the code sequences used for signatures to include a random access channel in association with amounts of propagation delay, and selects a signature generated from a code sequence using a cyclic shift value associated with the estimated amount of propagation delay; a generating section that generates a random access channel signal including the selected signature; and a transmission section that transmits the generated random access channel signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A radio transmitting method comprising the steps of:
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estimating an amount of propagation delay based on a downlink signal; providing in advance cyclic shift values for cyclically shifting the code sequences used for signatures to include a random access channel in association with amounts of propagation delay, and selecting a signature generated from a code sequence using a cyclic shift value associated with the estimated amount of propagation delay; generating a random access channel signal including the selected signature; and transmitting the generated random access channel signal.
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Specification