Transmission apparatus, transmission method, reception apparatus, and reception method

Abstract

A disclosed transmission apparatus includes a multiplexing portion that multiplexes a common pilot channel, a shared control channel, and a shared data channel; a symbol generation portion that performs an inverse Fourier transformation on the multiplexed signal so as to generate a symbol; and a transmission portion that transmits the generated symbol. The multiplexing portion multiplexes the shared control channel including control information necessary for demodulation of the shared data channel including a payload and the common pilot channel to be used by plural users in a frequency direction, and the shared data channel in a time direction with respect to the common pilot channel and the shared control channel. Even when the number of symbols composing a transmission time interval (TTI) is reduced, transmission efficiency of channels excluding the common pilot channel can be maintained by reducing insertion intervals of the common pilot channel accordingly.

1 . A transmission apparatus comprising:
 a multiplexing portion that multiplexes a common pilot channel, a shared control channel, and a shared data channel;   a symbol generation portion that performs an inverse Fourier transformation on the multiplexed signal so as to generate a symbol; and   a transmission portion that transmits the generated symbol;   wherein the multiplexing portion multiplexes the shared control channel including control information necessary for demodulation of the shared data channel including a payload and the common pilot channel to be used by plural users in either one of a frequency direction and a time direction, or a combination thereof, and multiplexes the shared data channel in either one of a frequency direction and a time direction, or a combination thereof, with respect to the common pilot channel and the shared control channel.   
   
   
       2 . The transmission apparatus of  claim 1 , wherein the multiplexing portion multiplexes a dedicated pilot channel to be used by one or more of specific users to demodulate the shared data channel in either one of the frequency direction and the time direction, or a combination thereof, with respect to the common pilot channel and the shared control channel. 
   
   
       3 . The transmission apparatus of  claim 2 , wherein the dedicated pilot channel is time-multiplexed at a first point of time at predetermined frequency intervals and also time-multiplexed at a second point of time at the predetermined frequency intervals. 
   
   
       4 . The transmission apparatus of  claim 2 , wherein the dedicated pilot channel is transmitted to a communications party that moves at high moving velocity but not to another communications party that does not move at high moving velocity. 
   
   
       5 . The transmission apparatus of  claim 2 , further comprising a portion that adjusts transmission beam directionality to a specific communications party, wherein the dedicated pilot channel is inserted for the specific communications party. 
   
   
       6 . The transmission apparatus of  claim 2 , further comprising plural transmission antennas, wherein the common pilot channel is transmitted from one or more of the plural transmission antennas and the dedicated pilot channel is transmitted from any other one or more of the plural transmission antennas. 
   
   
       7 . The transmission apparatus of  claim 2 , wherein the common pilot channel and the dedicated pilot channel are discontinuously mapped in either one of the time direction and the frequency direction, or a combination thereof. 
   
   
       8 . The transmission apparatus of  claim 1 , wherein the common pilot channel is transmitted with codes that are orthogonal between either one of cells and sectors. 
   
   
       9 . The transmission apparatus of  claim 1 , wherein the common pilot channel is composed of either one of all and part of a CAZAC code having a predetermined code length. 
   
   
       10 . The transmission apparatus of  claim 8 , wherein when the shared data channel is transmitted in a cell or sector, and transmission power of the shared data channel is reduced below a predetermined value in different cells or sectors. 
   
   
       11 . The transmission apparatus of  claim 8 , wherein the common pilot channel in a cell or sector is transmitted at either one of a different time and a different frequency, or a combination thereof, from the common pilot channel to be transmitted in a different cell or sector. 
   
   
       12 . The transmission apparatus of  claim 11 , wherein when the common pilot channel is transmitted in a cell or sector, transmission power of the shared data channel is reduced below a predetermined value in a different cell or sector. 
   
   
       13 . A transmission method comprising steps of:
 multiplexing a common pilot channel to be used by plural users and a shared control channel including control information necessary for demodulation of a shared data channel including a payload in either one of a frequency direction and a time direction, or a combination thereof, and the shared data channel in either one of the frequency direction and the time direction, or a combination thereof, with respect to the common pilot channel and the shared control channel;   performing an inverse Fourier transform on the multiplexed signal so as to generate a symbol; and   transmitting the generated symbol   
   
   
       14 . A reception apparatus comprising:
 a reception portion that receives a symbol transmitted from a transmitter;   a transformation portion that performs a Fourier transformation on the received symbol; and   a separation portion that separates a common pilot channel, a shared control channel and a shared data channel from the transformed signal;   wherein the separation portion separates the common pilot channel to be used by plural users and the shared control channel including control information necessary for demodulation of the shared data channel in either one of a frequency direction and a time direction, or a combination thereof, and separates the shared data channel including a payload in either one of the frequency direction and the time direction, or a combination thereof, with respect to the common pilot channel and the shared control channel.   
   
   
       15 . A reception method comprising steps of:
 receiving a symbol transmitted from a transmitter;   performing a Fourier transformation on the received signal; and   separating a common pilot channel to be used by plural users and a shared control channel including control information necessary for demodulation of a shared data channel including a payload in either one of a frequency direction and a time direction, or combination thereof, and the shared data channel in either one of the frequency direction and the time direction, or a combination thereof, with respect to the common pilot channel and the shared control channel.   
   
   
       16 . A transmission apparatus comprising:
 a generation portion that generates a common pilot channel to be used by plural mobile stations;   a multiplexing portion that multiplexes two or more channels to be transmitted; and   a first multiplication portion that multiplies the common pilot channel by a spreading code sequence common to plural sectors and an orthogonal code sequence different in different sectors.   
   
   
       17 . The transmission apparatus of  claim 16 , wherein the first multiplication portion multiplies other channels excluding the pilot channel by the spreading code sequence common to plural sectors and the orthogonal code sequence different in different sectors. 
   
   
       18 . The transmission apparatus of  claim 17 , further comprising:
 a derivation portion that derives another spreading code sequence from the spreading code sequence common to the plural sectors in accordance with a predetermined rule; and   a second multiplication portion that multiplies other channels excluding the pilot channel by the derived spreading code sequence.   
   
   
       19 . The transmission apparatus of  claim 18 ,
 wherein the first multiplication portion multiplies the common pilot channel and the shared control channel by the spreading code sequence common to the plural sectors and the orthogonal code sequence different in different sectors; and   wherein the second multiplication portion multiplies the shared data channel by the derived spreading code sequence.   
   
   
       20 . The transmission apparatus of  claim 9 , wherein when the shared data channel is transmitted in a cell or sector, and transmission power of the shared data channel is reduced below a predetermined value in different cells or sectors. 
   
   
       21 . The transmission apparatus of  claim 9 , wherein the common pilot channel in a cell or sector is transmitted at either one of a different time and a different frequency, or a combination thereof, from the common pilot channel to be transmitted in a different cell or sector.