Method for retransmission of lost packet in fading channels

A method for retransmission of a lost packet in a fading channel, in a communications system including a transmitter and a receiver, comprising the following steps:

• setting at least two queues in the transmitter, including a transmission queue and a retransmission queue;
• storing new data packets, which will be transmitted, in the transmission queue, and storing the copies of the lost data packet, the number of which is defined by a number of retransmission, in the retransmission queue;
• determining whether the retransmission queue is empty or not, and when the current retransmission queue is empty, transmitting by a first-in-first-out principle, data packets in the transmission queue;
• and when the current retransmission queue is not empty transmitting the data packet copies in the retransmission queue with an interleaving transmission;
• setting a minimum value of time length of interleaving retransmission interval by a timer, selecting one copy of every retransmission data packet from the retransmission queue, transmitting them in every interleaving retransmission interval by the first-in-first-out principle;
• if before the end of an interleaving retransmission interval, one copy of every retransmission data packet in the retransmission queue has been transmitted, then with first-in-first-out principle, transmitting data packets in the transmission queue until the end of the minimum value, set by the timer, of the interleaving retransmission interval time length, and then, ending the interleaving retransmission interval and starting next one interleaving retransmission interval;
• if before the end of the minimum value of the interleaving retransmission interval time length, one copy of all data packets in the retransmission queue has been transmitted and the transmission queue is empty, then stopping transmission until the end of the minimum value, set by the timer, of the interleaving retransmission interval time length, and then, the interleaving retransmission interval will be ended and starting the next interleaving transmission interval;
• and
• when an interleaving retransmission interval is ended and the retransmission queue is empty, then transmitting data packets in the transmission queue by first-in-first-out principal.

A method for retransmission of lost packets in a fading channel, in a communications system including a transmitter and a receiver, the method comprising the following steps:

• setting at least two queues in the transmitter, including a transmission queue and a retransmission queue;
• storing new data packets, which will be transmitted, in the transmission queue, and storing copies of lost packets, the number of which is defined by a current number of retransmission, in the retransmission queue;
• determining whether the retransmission queue is empty or not, and when the retransmission queue is empty, transmitting using a first-in-first-out principle, data packets in the transmission queue;
• and
• when the current retransmission queue is not empty, transmitting the data packet copies in the retransmission queue by multiple queue polling transmission;
• setting copy queues in the retransmission queue with sequence number, each copy queue including one copy of different data packet, starting from a first copy queue, and with first-in-first-out principle, transmitting every data packet copy in each copy queue in sequence, starting only after sending out all the copies in one queue the next copy queue transmission until the final copy queue, and when all the copy queues are empty, ending the polling transmission and starting the transmission of said transmission queue.

A method for retransmission of a lost packet in a fading channel, in a mobile communication system including a transceiver, comprising the steps of:

• transmitting by said transceiver a packet to a receiver;
• when the transceiver receives information which indicates that the receiver does not receive a specific packet generating a plurality of copies of the specific packet;
• and
• retransmitting by said transceiver the copies of the specific packet in order at predetermined intervals the predetermined intervals including an inserted delay wherein the inserted delay is a function of a fading period.