Method and apparatus for processing uplink frequency shift of communication system

A method for processing an uplink frequency offset of a communication system, applied to a terminal, comprising:

• after sending a random access message to a base station, receiving an initial Doppler frequency offset sent by the base station;
• locking an initial downlink transmission frequency, and obtaining an initial uplink transmission frequency according to the initial downlink transmission frequency and the initial Doppler frequency offset;
• sending an uplink subframe signal to the base station according to the initial uplink transmission frequency;
• and
• receiving a frequency retuning amount sent by the base station, obtaining a transmission frequency of a next uplink transmission according to the frequency retuning amount, and sending an uplink subframe signal to the base station.

An apparatus for processing an uplink frequency offset of a communication system, applied to a base station and comprising a frequency offset estimation module and a delivery module,

• wherein the frequency offset estimation module is configured to demodulate a random access message sent by a terminal to obtain an initial Doppler frequency offset of the terminal;
• the delivery module is configured to deliver the initial Doppler frequency offset to the terminal;
• the frequency offset estimation module is further configured to receive an uplink subframe signal sent by the terminal according to an initial uplink transmission frequency which is determined according to an initial downlink transmission frequency and the initial Doppler frequency offset, estimate a residual Doppler frequency offset of the terminal on an uplink according to the uplink subframe signal, and obtain a frequency retuning amount according to the residual Doppler frequency offset;
• and
• the delivery module is further configured to deliver the frequency retuning amount to the terminal.

An apparatus for processing an uplink frequency offset of a communication system, applied to a terminal and comprising a sending module, a receiving module, a frequency locking module, and a calculating module;

• wherein the sending module is configured to send a random access message to a base station;
• the receiving module is configured to receive an initial Doppler frequency offset sent by the base station;
• the frequency locking module is configured to lock an initial downlink transmission frequency;
• the calculating module is configured to obtain an initial uplink transmission frequency according to the initial downlink transmission frequency and the initial Doppler frequency offset;
• the sending module is further configured to send an uplink subframe signal to the base station according to the initial uplink transmission frequency;
• the receiving module is further configured to receive a frequency retuning amount sent by the base station;
• the calculating module is further configured to obtain a transmission frequency of a next uplink transmission according to the frequency retuning amount;
• and
• the sending module is further configured to send an uplink subframe signal to the base station according to the transmission frequency of the next uplink transmission.

A non-transitory computer readable storage medium, storing a program for processing an uplink frequency offset of a communication system, wherein the program for processing an uplink frequency offset of a communication system, when executed by a processor, implements a method for processing an uplink frequency offset of a communication, wherein the method for processing an uplink frequency offset of a communication comprises:

• demodulating a random access message sent by a terminal to obtain an initial Doppler frequency offset of the terminal;
• delivering the initial Doppler frequency offset to the terminal;
• receiving an uplink subframe signal sent by the terminal according to an initial uplink transmission frequency which is determined according to an initial downlink transmission frequency and the initial Doppler frequency offset, estimating a residual Doppler frequency offset of the terminal on an uplink according to the uplink subframe signal, and obtaining a frequency retuning amount according to the residual Doppler frequency offset;
• and
• delivering the frequency retuning amount to the terminal.