Radio communications method, transmitter, and receiver
The transmitter transmits at least any one of the multiple kinds of generated pilot signals corresponding to the multiple types of communications services by use of a predetermined band set in a part of a transmission band beforehand, and transmits the other kinds of pilot signals using parts of the transmission band other than the predetermined band. The receiver detects a signal in a band containing at least the predetermined band, out of reception signals from the transmitter, and detects the pilot signal from the detected signal. With this construction, even if other pilot signals are frequency-division multiplexed to the same time domain, the receiver is capable of detecting a pilot signal accurately while avoiding the effect of interference due to the other pilot signals.
1. A radio communications method for use in a radio communications system including: a transmitter; and a receiver being operable to perform radio communications with the transmitter in a plurality of types of communications services, said radio communications method comprising:
by the transmitter,
generating a plurality of kinds of codes, which are unique to respective cells, corresponding to any one of the plurality of types of communications services;
controlling guard intervals of at least any one of the plurality of kinds of codes so that starting positions of the plurality of kinds of codes to be transmitted in a subframe become identical; and
transmitting at least first codes among the plurality of codes using a first band set in a transmission band, and also transmitting second codes among the plurality of kinds of codes different from the first codes using a second band set in the transmission band different from the first band,
by the receiver,
receiving the plurality of kinds of codes transmitted from the transmitter.
2. The radio communications method as set forth in claim 1 , wherein the first band is a band containing a central part band of the transmission band.
3. The radio communications method as set forth in claim 1 , wherein the first band is a central part band of the transmission band.
4. The radio communications method as set forth in claim 1 ,
by the transmitter,
controlling the width of the first band in accordance with the width of the transmission band.
5. The radio communications method as set forth in claim 4 ,
by the transmitter,
performing control such that the wider is the transmission band, the wider is made the first band.
6. The radio communications method as set forth in claim 1 ,
wherein the first codes transmitted in the first band contains a pilot signal for use in a unicast communications service, and
wherein the second codes transmitted in the second band contains a pilot signal for use in a multicast or a broadcast communications service.
7. The radio communications method as set forth in claim 6 , wherein a pattern of the pilot signal for use in the unicast communications service is different from a pattern of the pilot signal for use in a multicast or a broadcast communications service.
8. A base station being operable to perform radio communications with a mobile station in a plurality of types of communications services, the base station comprising:
a controller configured to control guard intervals of at least any one of a plurality of kinds of codes, which are unique to respective cells and corresponding to any one of the plurality of types of communication services, so that starting positions of the plurality of kinds of codes to be transmitted in a subframe become identical; and
a transmitter configured to transmit at least first codes among the plurality of kinds of codes using a first band set in a transmission band, and also transmit second codes among the plurality of kinds of codes different from the first codes using a second band set in the transmission band different from the first band.
9. The base station as set forth in claim 8 , wherein the first band is a band containing a central part band of the transmission band.
10. The base station as set forth in claim 8 , wherein the first band is a central part band of the transmission band.
11. The base station as set forth in claim 8 , wherein said transmitter includes:
a unicast pilot generating unit which generates the first codes for use in unicast communications service as a pilot signal to be transmitted in the first band; and
a multicast/broadcast generating unit which generates the second codes for use in a multicast or a broadcast communication services as a pilot signal to be transmitted in the second transmission band.
12. The base station as set forth in claim 11 ,
said unicast pilot generating unit including a storage unit which stores the first codes, and
said multicast/broadcast generating unit including a storage unit which stores the second codes.
13. The base station as set forth in claim 12 , wherein a pattern of the first codes is different from a pattern of the second codes.
14. A mobile station being operable to perform radio communications with a base station in a plurality of types of communications services, the mobile station comprising:
a receiver configured to receive a plurality of kinds of codes, which are unique to respective cells, corresponding to any one of the plurality of types of communications services from the base station, wherein
guard intervals of at least any one of the plurality of kinds of codes are controlled at the base station so that starting positions of the plurality of kinds of codes to be transmitted in a subframe become identical, and wherein
at least first codes among the plurality of kinds of codes are transmitted using a first band set in a transmission band, and second codes among the plurality of kinds of codes different from the first codes are transmitted using a second band set in the transmission band different from the first band.
15. A radio communications method for use in a radio communications system including: a transmitter; and a receiver being operable to perform radio communications with the transmitter in a plurality of types of communications services, said radio communications method comprising:
by the transmitter,
generating a plurality of kinds of codes, which are unique to respective cells, corresponding to any one of the plurality of types of communications services;
controlling guard intervals of at least any one of the plurality of kinds of codes so that lengths of guard intervals of the plurality of kinds of codes become same; and
transmitting first codes among the plurality of kinds of codes using a first band set in a transmission band, and also transmitting second codes among the plurality of kinds of codes different from the first codes using a second band set in the transmission band different from the first band,
by the receiver,
receiving the plurality of kinds of codes transmitted from the transmitter.
16. A radio communications method for use in a radio communications system including: a transmitter; and a receiver being operable to perform radio communications with the transmitter in a plurality of types of communications services, said radio communications method comprising:
by the transmitter,
generating a plurality of kinds of codes, which are unique to respective cells, corresponding to any one of the plurality of types of communications services;
controlling guard intervals of at least any one of the plurality of kinds of codes and setting starting positions of the plurality of codes to be transmitted in a subframe become identical; and
transmitting the plurality of kinds of codes to the receiver,
by the receiver,
receiving the plurality of kinds of codes transmitted from the transmitter.