Downlink data repeat transmission method and device

A method for repeated transmission of downlink data, the method comprising:

• determining a set of sub-frames for repeated transmission of a physical downlink channel;
• determining that the physical downlink channel is mapped to resources in each sub-frame in the determined set of sub-frames by starting at a specific start symbol position in a first slot of a current sub-frame and mapping onto all resources other than resources corresponding to a reference signal for demodulation;
• wherein the physical downlink channel is manned to resources in different sub-frames by starting at the same specific start symbol position;
• and
• receiving the physical downlink channel according to the resource mapping mode.

A transmitting device, comprising:

• a transmitter;
• a processor;
• and
• a memory storing at least one instruction, wherein the processor is configured to execute the at least one instruction to:
• determine a set of sub-frames for repeated transmission of a physical downlink channel;
• map the physical downlink channel to resources in each sub-frame in the determined set of sub-frames by starting at a specific start symbol position in a first slot of a current sub-frame and mapping onto all resources other than resources corresponding to a reference signal for demodulation;
• wherein the physical downlink channel is mapped to resources in different sub-frames by starting at the same specific start symbol position;
• and
• control the transmitter to transmit the physical downlink channel according to the resource mapping mode.

A receiving device, comprising:

• a receiver;
• a processor;
• and
• a memory storing at least one instruction, wherein the processor is configured to execute the at least one instruction to:
• determine a set of sub-frames for repeated transmission of a physical downlink channel;
• determine that the physical downlink channel is mapped to resources in each sub-frame in the determined set of sub-frames by starting at a specific start symbol position in a first slot of a current sub-frame and mapping onto all resources other than resources corresponding to a reference signal for demodulation;
• wherein the physical downlink channel is mapped to resources in different sub-frames by starting at the same specific start symbol position;
• and
• control the receiver to receive the physical downlink channel according to the resource mapping mode.