Method and system of bi-directional transmission to improve uplink performance

Abstract

In coverage enhancement of machine type communication (MTC), a downlink transmitted bit stream is jointly encoded with uplink payload by the terminal. The combined signal is sent on uplink, to be jointly decoded by the base station that knows the downlink payload and the joint encoding mechanism at the mobile terminal.

1 - 20 . (canceled) 
     
     
         21 . A method of wireless communication comprising,
 transmitting, by a base station to at least one of a plurality of terminals, a downlink message comprising user-specific information to individual ones of the plurality of terminals;   receiving, by the base station from the at least one of the plurality of terminals, an uplink message encoded jointly with at least some of information in the downlink message; and   decoding the uplink message based on the downlink message.   
     
     
         22 . The method of  claim 21 , wherein the user-specific information comprises at least one of a payload size, a modulation order, a bit rate, a signal format, a channel coding, or a time-frequency resource that is different the individual ones of the plurality of terminals. 
     
     
         23 . The method of  claim 21 , wherein the uplink message is encoded jointly based on performing a bitwise “exclusive or” operation on information in the downlink message and information in the uplink message. 
     
     
         24 . The method of  claim 21 , wherein the plurality of terminals comprises machine type communication (MTC) devices. 
     
     
         25 . A wireless communication device, comprising:
 a transmitter configured to transmit, to at least one of a plurality of terminals, a downlink message comprising user-specific information to individual ones of the plurality of terminals;   a receiver configured to receive, from the at least one of the plurality of terminals, an uplink message encoded jointly with at least some of information in the downlink message; and   a processor configured to decode the uplink message based on the downlink message.   
     
     
         26 . The device of  claim 25 , wherein the user-specific information comprises at least one of a payload size, a modulation order, a bit rate, a signal format, a channel coding, or a time-frequency resource that is different the individual ones of the plurality of terminals. 
     
     
         27 . The base station of  claim 25 , wherein the uplink message is encoded jointly based on performing a bitwise “exclusive or” operation on information in the downlink message and information in the uplink message. 
     
     
         28 . The base station of  claim 25 , wherein the plurality of terminals comprises machine type communication (MTC) devices. 
     
     
         29 . A method of wireless communication, comprising:
 receiving, by a terminal from a base station, a downlink message that is user-specific to the terminal;   encoding an uplink message jointly with at least some of information in the downlink message; and   transmitting the uplink message that is jointly encoded to the base station.   
     
     
         30 . The method of  claim 29 , wherein at least one of a payload size, a modulation order, a bit rate, a signal format, a channel coding, or a time-frequency resource of the downlink message is user-specific to the terminal. 
     
     
         31 . The method of  claim 29 , wherein encoding comprises performing a bitwise “exclusive or” operation on information in the downlink message and information in the uplink message. 
     
     
         32 . The method of  claim 29 , wherein the terminal comprises a machine type communication (MTC) device. 
     
     
         33 . A wireless communication device, comprising:
 a receiver configured to receive, from a base station, a downlink message that is user-specific to the terminal;   an encoder configured to encode an uplink message jointly with at least some of information in the downlink message; and   a transmitter configured to transmit, to the base station, the uplink message that is jointly encoded.   
     
     
         34 . The device of  claim 33 , wherein at least one of a payload size, a modulation order, a bit rate, a signal format, a channel coding, or a time-frequency resource of the downlink message is user-specific to the terminal. 
     
     
         35 . The device of  claim 33 , wherein the encoder is configured to encode the uplink message jointly based on performing a bitwise “exclusive or” operation on information in the downlink message and information in the uplink message.