RADIO TRANSMISSION DEVICE, AND RADIO TRANSMISSION METHOD
First Claim
1. A radio transmitting apparatus comprising:
- a determination section that determines whether or not uplink synchronization is established;
a selection section that selects a signature generated from a code sequence using a cyclic shift value;
a generating section that generates a random access signal including the selected signature; and
a transmission section that transmits the generated random access signal on a random access channel,wherein the selection section switches the cyclic shift value based on whether or not the uplink synchronization is established.
1 Assignment
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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.
24 Citations
11 Claims
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1. A radio transmitting apparatus comprising:
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a determination section that determines whether or not uplink synchronization is established; a selection section that selects a signature generated from a code sequence using a cyclic shift value; a generating section that generates a random access signal including the selected signature; and a transmission section that transmits the generated random access signal on a random access channel, wherein the selection section switches the cyclic shift value based on whether or not the uplink synchronization is established. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio transmitting method performed by a radio transmitting apparatus comprising:
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determining whether or not uplink synchronization is established; selecting a signature generated from a code sequence using a cyclic shift value, the cyclic shift value being switched depending on whether or not the uplink synchronization is established; generating a random access signal including the selected signature; and transmitting the generated random access signal on a random access channel.
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Specification