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US 2011/0085514 A1Published application
Base station, mobile station, and communications method
AssigneeNtt Docomo, Inc.
InventorsKenichi Higuchi, Mamoru Sawahashi
Life of this patent
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Abstract
A base station carrying out communications with a mobile station with an Orthogonal Frequency Division Multiplexing (OFDM) method by using a predetermined frequency band out of a transmission band is disclosed. The base station includes an allocation portion that allocates, for a mobile station performing peripheral cell search, a band that includes a center frequency on a raster of a first band and has a bandwidth equal to or greater than a bandwidth of a second band with which a synchronization channel is transmitted.
Claims9
-14. (canceled)
A transmission apparatus comprising:
- a synchronization channel signal generation portion configured to generate a synchronization channel signal;
- a broadcast channel signal generation portion configured to generate a broadcast channel signal;
- a paging channel signal generation portion configured to generate a paging channel signal;
- an L1/L2 control channel signal generation portion configured to generate an L1/L2 control channel signal;
- a data channel signal generation portion configured to generate a data channel;
- a multiplexing portion configured to multiplex the synchronization channel signal, the broadcast channel signal, the paging channel signal, the L1/L2 control channel signal, and the data channel signal;
- and
- a transmission portion configured to transmit a signal multiplexed by the multiplexing portion,
- wherein a variable-width system band is divided into a plurality of frequency blocks, each of which is comprised of a plurality of continuous sub-carriers, in the multiplexing portion, and
- wherein the multiplexing portion multiplexes the synchronization channel signal and the broadcast channel signal in a plurality of frequency blocks whose number is determined so that a width of the plurality of the frequency blocks is smaller than the smallest width among widths of corresponding variable bands, regardless of the width of the system band, the plurality of the frequency blocks including a center frequency of the system band, and multiplexes the paging channel signal, the L1/L2 control channel signal, and the data channel signal in another plurality of frequency blocks that include a frequency block including the center frequency of the system band, the number of the another plurality of the frequency blocks being greater than the number of the plurality of the frequency blocks in which the synchronization channel signal and the broadcast channel are multiplexed.
7 more elements
A transmission method comprising steps of:
- generating a synchronization channel signal;
- generating a broadcast channel signal;
- generating a paging channel signal;
- generating an L1/L2 control channel signal;
- generating a data channel signal;
- multiplexing the synchronization channel signal, the broadcast channel signal, the paging channel signal, the L1/L2 control channel signal, and the data channel signal;
- and
- transmitting the multiplexed signal,
- wherein a variable-width system band is divided into a plurality of frequency blocks, each of which is comprised of a plurality of continuous sub-carriers, in the multiplexing step, and
- wherein in the multiplexing step, the synchronization channel signal and the broadcast channel signal are multiplexed in a plurality of frequency blocks whose number is determined so that a width of the plurality of the frequency blocks is smaller than the smallest width among widths of corresponding variable bands, regardless of the width of the system band, the plurality of the frequency blocks including a center frequency of the system band, and the paging channel signal, the L1/L2 control channel signal, and the data channel signal are multiplexed in another plurality of frequency blocks that include a frequency block including the center frequency of the system band, the number of the another plurality of the frequency blocks being greater than the number of the plurality of the frequency blocks in which the synchronization channel signal and the broadcast channel are multiplexed.
7 more elements
Dependencies are inferred from the claim text.