Method for receiving and transmitting data blocks
View Patent ↗The present invention provides a scalable and reliable feedback suppression method for receiving and transmitting data block. The method comprises receiving at least one initial data packet of the data block which is sent by the transmitter to the multicast group of receivers; and sending at least one NAK packet indicating packet loss to the transmitter by at least one receiver of the multicast group, wherein the at least one NAK packet is sent in a single uplink time slot dedicated to said multicast group of receivers, and wherein the NAK packet is identical for all receivers of said multicast group.
1. A method for receiving a data block comprising at least one data packet from a transmitter, used in a receiver part of a multicast group of receivers in a communication network, including:
a. receiving said at least one data packet of the data block;
b. if insufficient data packets have been received in order to decode said data block due to packet loss, sending a negative-acknowledgment (NAK) message during a same time slot allocated to all receivers of the multicast group and wherein said NAK message is identical for all receivers of the multicast group;
c. receiving at least one recovery data packet from said transmitter; and
d. repeating steps b and c until a predetermined condition is met.
2. The method according to claim 1 , wherein the same time slot is a time slot of a synchronization uplink channel.
3. The method according to claim 1 , further including the step of sending is performed if there is still packet loss so as to have a problem of decoding the data block at the at least the receiver after receiving the at least one recovery data packet.
4. The method according to claim 3 , wherein data packets taken into consideration for sending a NAK message include said at least one data packet and at least one recovery data packet.
5. The method according to claim 1 , wherein the predetermined condition is the maximum number of recovery symbols for a given data block or the maximum allowable time period of transmitting the recovery symbols for a given block.
6. A receiver for implementing the method for receiving a data block according to claim 1 .
7. A method for sending a data block comprising at least one data packet to a multicast group of receivers, used in a transmitter of a communication network, including:
a. sending said at least one data packet of the data block;
b. providing a same time slot for all receivers of the multicast group to send a NAK message, wherein the NAK message is the same for all receivers from the multicast group;
c. if a NAK message is received:
d. sending at least one recovery data packet to the receivers of the muiticast group;
e. providing a further same time slot for receivers of the multicast group to send a further NAK message; and
f. repeating steps c to e until a predetermined condition is met.
8. The method according to claim 7 , wherein the uplink time slot is a time slot of a synchronization uplink channel.
9. The method according to claim 7 , wherein the further NAK message indicates packet loss of said at least one data packets or said at least one recovery packets.
10. The method according to claim 7 , wherein the predetermined condition is a number of the further sending steps.
11. A transmitter for implementing the method for transmitting a data block according to claim 7 .