Apparatus for generating a set of radio parameters, a transmitter and a receiver

Abstract

A transmitter includes: a data modulation and channel coding unit configured to perform data modulation and channel coding for a data channel with a modulation level and a channel coding rate updated for each transmission time interval; a multiplexing unit configured to multiplex a control channel and the data channel for each transmission time interval; and an adjusting means configured to adjust a length of the transmission time interval. Increasing a unit of information transmission in the time direction and/or the frequency direction depending on communication conditions can reduce a frequency of inserting (allocating) the control channel, and can improve data transmission efficiency.

1 . A transmitter used in an OFDM (Orthogonal Frequency Division Multiplexing) mobile communication system, comprising:
 a data modulation and channel coding unit configured to perform data modulation and channel coding for a data channel with a modulation level and a channel coding rate updated for each transmission time interval;   a multiplexing unit configured to multiplex a control channel and the data channel for each transmission time interval; and   an adjusting means configured to adjust a length of the transmission time interval.   
   
   
       2 . The transmitter as claimed in  claim 1 , wherein:
 the control channel is multiplexed into part of subcarriers.   
   
   
       3 . The transmitter as claimed in  claim 1 , wherein:
 the control channel at least includes information about the modulation level and the channel coding rate.   
   
   
       4 . The transmitter as claimed in  claim 1 , further comprising:
 a transmission unit configured to transmit multiple symbols for each transmission time interval, each of the multiple symbols including a guard interval and an effective symbol; and   a storing unit configured to store two or more sets of parameters, each of the two ore more sets of parameters defining a symbol including a guard interval with a different period and an effective symbol with the same period.   
   
   
       5 . A receiver used in an OFDM (Orthogonal Frequency Division Multiplexing) mobile communication system, comprising:
 a demultiplexing unit configured to extract a control channel and a data channel for each transmission time interval;   a data demodulation and channel decoding unit configured to perform data demodulation and channel decoding for the data channel with a modulation level and a channel coding rate updated for each transmission time interval; and   an adjusting means configured to adjust a length of the transmission time interval.   
   
   
       6 . The receiver as claimed in  claim 5 , wherein:
 the control channel at least includes information about the modulation level and the channel coding rate.   
   
   
       7 . The receiver as claimed in  claim 5 , further comprising:
 a receiving unit configured to receive multiple symbols for each transmission time interval, each of the multiple symbols including a guard interval and an effective symbol; and   a storing unit configured to store two or more sets of parameters, each of the two or more sets of parameters defining a symbol including a guard interval with a different period and an effective symbol with the same period.   
   
   
       8 . An apparatus for generating a set of radio parameters used for an OFDM (Orthogonal Frequency Division Multiplexing) mobile communication system which transmits and receives multiple symbols for each transmission time interval, each of the multiple symbols including a guard interval and an effective symbol, comprising:
 a first deriving unit configured to derive a set of second symbol parameters, so that a period of an effective symbol defined by a first set of symbol parameters is equal to a period of an effective symbol defined by the second set of symbol parameters, and a period of a guard interval defined by the first set of symbol parameters is different from a period of a guard interval defined by the second set of symbol parameters; and   a second deriving unit configured to derive a third set of symbol parameters, so that a share of a guard interval in a symbol defined by the first set of symbol parameters is equal to a share of a guard interval in a symbol defined by the third set of symbol parameters, and a length of the symbol defined by the first set of symbol parameters is different from a length of the symbol defined by the third set of symbol parameters; wherein   a length of the transmission time interval, a length of the symbol, or both a length of the transmission time interval and a length of the symbol is adjusted so that an integral number of symbols are transmitted during a single transmission time interval.