Transmission apparatus and transmission method for a downlink channel
AssigneeNtt Docomo, Inc.
InventorsYoshihisa Kishiyama, Kenichi Higuchi, Mamoru Sawahashi
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Abstract
The object is achieved by providing a transmission apparatus with: assignment means configured to assign, to each user, one of a frequency block that is obtained by dividing a system bandwidth into each block of continuous frequency subcarriers and a distributed type frequency block that include a frequency subcarrier that is discretely distributed in the system bandwidth; and mapping means configured to assign transmission data to one of the frequency block and the distributed type frequency block according to the assignment.
Claims6
A transmission apparatus comprising:
- a frequency scheduling unit configured to select a frequency block to be assigned to a downlink channel, wherein a system bandwidth is divided into a plurality of frequency blocks each comprising a plurality of consecutive frequency subcarriers in a frequency domain and each comprising a predetermined time length in a time domain, and wherein each frequency block comprises a same size in both of the frequency domain and the time domain;
- and
- a mapping unit configured to map data in the downlink channel to the frequency block selected by the frequency scheduling unit;
- wherein the frequency scheduling unit is adapted for a system where distributed type transmission for selecting frequency blocks according to a predetermined pattern for placement of the frequency blocks in the system bandwidth in a manner in which the frequency blocks are distributed depending on points of time and localized type transmission for selecting localized frequency blocks are defined, the frequency scheduling unit using either one of the distributed type transmission and the localized type transmission,
- wherein each of the frequency blocks having the same size is a common unit in the localized type transmission and the distributed type transmission and wherein each of the frequency blocks used in the distributed type transmission as the common unit is of the same size as each of the frequency blocks used in the localized type transmission as the common unit in both of the frequency domain and the time domain.
A transmission method comprising the steps of:
- selecting a frequency block to be assigned to a downlink channel, wherein a system bandwidth is divided into a plurality of frequency blocks each comprising a plurality of consecutive frequency subcarriers in a frequency domain and each comprising a predetermined time length in a time domain, and wherein each frequency block comprises a same size in both of the frequency domain and the time domain;
- and
- mapping data in the downlink channel to the selected frequency block;
- wherein, in the step of selecting, either one of distributed type transmission and localized type transmission is used, wherein distributed type transmission for selecting frequency blocks according to a predetermined pattern for placement of the frequency blocks in the system bandwidth in a manner in which the frequency blocks are distributed depending on points of time and localized type transmission for selecting localized frequency blocks are defined, and
- wherein each of the frequency blocks having the same size is a common unit in the localized type transmission and the distributed type transmission and wherein each of the frequency blocks used in the distributed type transmission as the common unit is of the same size as each of the frequency blocks used in the localized type transmission as the common unit in both of the frequency domain and the time domain.
Dependencies are inferred from the claim text.