Transmission processing method in mobile communications system and base station
AssigneeFujitsu Limited
InventorsTakashi SEYAMA, Takashi DATEKI, Hideto FURUKAWA
Life of this patent
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Abstract
In a case where multiple kinds of frames having different lengths (Ngi_s and Ngi_l) of guard intervals inserted before the head of the effective data, the length of the guard intervals are adjusted in such a manner that at least the position of a part of the effective data is are apart from frame timing by the same amount. Thereby, on the receiving end, it is always possible to perform reception processing such as FFT processing in an appropriate time division at a fixed timing, without causing sample deviation of the effective data.
Claims22
A transmission processing method for a mobile communications system which includes a base station and a mobile station adapted to perform radio communications with the base station in a cell that is a radio communication area formed by the base station, and which is operable to transmit a plurality of kinds of frames with guard intervals of different lengths inserted before effective data in a mixed condition thereof as downlink communications frames from the base station to the mobile station, said transmission processing method comprising the steps of:
- on the base station,
- adjusting the length of a guard interval in such a manner that at least the positions of a part of the effective data of said plurality of kinds of frames are apart from frame timing by the same amount;
- and
- transmitting the adjusted frames to the mobile station.
A base station which includes a base station and a mobile station adapted to perform radio communications with the base station in a cell that is a radio communication area formed by the base station, and which is operable to transmit a plurality of kinds of frames with guard intervals of different lengths inserted before effective data in a mixed condition thereof as downlink communications frames from the base station to the mobile station, said base station comprising:
- a guard interval inserting unit which inserts a guard interval before effective data of the leading portion of the frame;
- and
- a guard interval length controlling unit which controls the length of a guard interval to be inserted by said guard interval inserting unit in such a manner that at least the positions of a part of the effective data of said plurality of kinds of frames are apart from frame timing by the same amount.
A transmission processing method for a mobile communications system which includes a base station and a mobile station adapted to perform radio communications with the base station in a cell that is a radio communication area formed by the base station, and which is operable to transmit a plurality of kinds of frames with guard intervals of different lengths inserted before effective data in a mixed condition thereof as downlink frames from the base station to the mobile station, said transmission processing method comprising the steps of:
- on the base station,
- giving a phase rotation to the effective data of at least any one of said frames in accordance with a difference between the length of a guard interval of the effective data and the length of another guard interval of another frame;
- and
- transmitting the frame after being subjected to the phase rotation processing to the mobile station.
A base station including a base station and a mobile station adapted to perform radio communications with the base station in a cell that is a radio communication area formed by the base station, and which is operable to transmit a plurality of kinds of frames with guard intervals of different lengths inserted before effective data in a mixed condition thereof as downlink communications frames from the base station to the mobile station, said base station comprising:
- a guard interval inserting unit which inserts a guard interval before effective data of the leading portion of the frame;
- and
- a phase rotation processing unit which gives a phase rotation to the effective data of at least anyone of said frames in accordance with a difference between the length of a guard interval of the effective data and the length of another guard interval of another frame.
Dependencies are inferred from the claim text.