Frame structure for an adaptive modulation wireless communication system

Abstract

A method of simplifying the encoding of a predetermined number of bits of data into frames including adding error coding bits so that a ratio of the frame length times the baud rate of the frame times he bit packing ratio of the data divided the total bits of data is always an integer. The method may also convolutionally encode the bits of data so that the same equation is also always an integer.

1 . (canceled) 
     
     
         2 . A method of operating a base station in an on-demand wireless cellular communication system for assigning portions of at least two downlink slots of a plurality of downlink slots of a frame to at least two mobile cellular telephones for transmitting modulated data according to a modulation scheme that may vary for each of the at least two mobile cellular telephones, the method comprising:
 (a) determining a characteristic of the modulation scheme employed in generating the modulated data for the at least two mobile cellular telephones; and   (b) assigning the portions of the at least two slots to the at least two mobile cellular telephones based on the characteristic of the modulation scheme employed in generating the modulated data for the at least two mobile cellular telephones.   
     
     
         3 . The method according to  claim 2 , wherein at (b) the portions of the at least two downlink slots are assigned to the at least two mobile cellular telephones from the least complex modulation scheme to the most complex modulation scheme. 
     
     
         4 . The method according to  claim 2  wherein (b) includes:
 (i) ordering the at least two mobile cellular telephones as a function of the complexity of the modulation scheme employed to generate the modulated data for each of the at least two mobile cellular telephones; and 
 (ii) assigning the portions of the at least two slots to the at least two mobile cellular telephones based on the order of the at least two mobile cellular telephones. 
 
     
     
         5 . The method according to  claim 4 , wherein (ii) of  claim 3  includes assigning the portions of the at least two slots to the at least two mobile cellular telephones from the least complex modulation scheme to the most complex modulation scheme. 
     
     
         6 . The method according to  claim 5 , wherein the frame is a time division duplex frame. 
     
     
         7 . The method according to  claim 2 , wherein the bit per symbol rate of the modulation scheme employed to generate the modulated data may vary for each of the at least two mobile cellular telephones, wherein the determined characteristic of the modulation scheme employed in generating the modulated data for the at least two mobile cellular telephones determined in (a) is the bit per symbol rate. 
     
     
         8 . The method according to  claim 2 , wherein (b) includes:
 (i) ordering the at least two mobile cellular telephones as a function of the bit per symbol rate of the modulation scheme employed to generate the modulated data for each of the at least two mobile cellular telephones; and   (ii) assigning the portion of the at least two slots to the at least two mobile cellular telephones based on the order of the at least two mobile cellular telephones.   
     
     
         9 . The method according to  claim 8 , wherein (ii) includes assigning the portion of the at least two slots to the at least two mobile cellular telephones from the lowest bit per symbol rate modulation scheme to the highest bit per symbol rate modulation scheme. 
     
     
         10 . A base station for operation in an on-demand wireless cellular communication system, the base station comprising:
 a receiver operable to receive uplink transmissions from at least two mobile cellular telephones;   a transmitter operable to transmit modulated data in at least two downlink slots of a plurality of downlink slots of a frame to the at least two mobile cellular telephones, the transmitter including
 a frame constructor operable to
 determine a characteristic of a modulation scheme employed in generating the modulated data for the at least two mobile cellular telephones, and assign the portions of the at least two slots to the at least two mobile cellular telephones based on the characteristic of the modulation scheme employed in generating the modulated data for the at least two mobile cellular telephones. 
 
   
     
     
         11 . The base station according to  claim 10  wherein the frame constructor assigns the portions of the at least two slots to the at least two mobile cellular telephones from the least complex modulation scheme to the most complex modulation scheme. 
     
     
         12 . The base station according to  claim 10 , wherein the frame is a time division duplex frame.