Data transmission in a multicast fashion in which retransmissions are requested by recipients sending feedback to the one sender. Receiving stations are informed about the feedback of another receiving station. This is done by mirroring the feedback of receiving stations to other receiving stations.
Data transmission in a multicast fashion in which retransmissions are requested by recipients sending feedback to the one sender. Receiving stations are informed about the feedback of another receiving station. This is done by mirroring the feedback of receiving stations to other receiving stations. Due to this, in case, for example, one of the mirrored feedbacks is a negative acknowledgement message, the other receiving stations are informed that it is no longer necessary to provide their feedback, since a retransmission will be initiated anyway. Advantageously, this may allow reduced interference in the direction of the feedback
대표청구항▼
1. A transmission station for point-to-multipoint data transmission to a plurality of receiving stations, the transmission station comprising: a transmitter configured to transmit data to a plurality of first receiving stations in a point-to-multipoint transmission system;a receiver configured to re
1. A transmission station for point-to-multipoint data transmission to a plurality of receiving stations, the transmission station comprising: a transmitter configured to transmit data to a plurality of first receiving stations in a point-to-multipoint transmission system;a receiver configured to receive a confirmation message with respect to the data from at least one second receiving station of the plurality of first receiving stations at the transmitting station, the confirmation message being at least one of: a negative acknowledgement message indicating that the at least one second receiving station unsuccessfully decoded the data, anda positive acknowledgement message indicating that the at the at least one second receiving station at least successfully decoded the data;the transmitter configured to re-transmit the confirmation message from the transmitting station to at least one third receiving station of the plurality of first receiving stations;a processor configured to: at least logically group the first receiving stations into at least a first and a second groups of first receiving stations on the basis of the path loss values between the transmitting station and the first receiving stations, such that each group includes at least one receiving station of the plurality of first receiving stations, and wherein the path loss value of the receiving stations of the first group is lower than the path loss value of the receiving stations of the second group;assign a first and a second predetermined feedback phases respectively to the first and to the second groups, wherein the second feedback phase occurs after the first feedback phase;the receiver configured to receive the at least one second receiving station sends the confirmation message to the transmitting station in accordance with the first or the second feedback phases when the second receiving station belongs to respectively the first or the second group;the transmitter configured to transmit to the at least one first receiving station of the second group, an indication that a negative acknowledgement has already been received by the transmitting station for the transmitted data; andthe transmission to the at least one first receiving station of the second group, of the indication that the negative acknowledgement has already been received by the transmitting station for the transmitted data, suppresses reception of further negative acknowledgements. 2. The transmission station of claim 1, wherein, the transmitter is configured to retransmit the data when the confirmation message is a negative acknowledgement message. 3. The transmission station of claim 1, wherein: after a retransmission of the data, the receiver is configured to only receive messages from third groups of the plurality of groups which have not sent the positive acknowledgement message with respect to the data; andthe receiver considers third groups to have sent the positive acknowledgement message when all of the receiving stations belonging to the groups have sent the positive acknowledgement message. 4. The transmission station of claim 1, wherein: the confirmation message is a negative acknowledgement message indicating that the at least one second receiving station could not successfully decode the data error-free; andthe transmission station retransmits the data upon reception and decoding of the confirmation message. 5. The transmission station of claim 1, wherein the method is applied in the context of Multimedia Broadcast Multicast Services in UMTS. 6. The transmission station of claim 1, wherein the receiver is configured to: receive the confirmation message comprising confirmation data in a form of soft bits; andsoft-combine the confirmation message of the at least one fourth receiving station of the first group with the confirmation message of the at least one fifth receiving station of the second group. 7. The transmitting station of claim 1, wherein: the receiver is configured to receive a confirmation message from at least one seventh receiving station of the plurality of first receiving stations with a first transmission power;when a confirmation message is received from a minimum number of seventh receiving stations in accordance with a third feedback phase in accordance with a feedback scheme, resulting in a superposition of confirmation messages and therefore in an increase of power received at the transmitting station, the received power at the transmitting station is sufficient for decoding the superposition of confirmation messages; andwhen a confirmation message is received by less than a minimum number of seventh receiving stations in accordance with the third feedback phase, the received power at the transmitting station is not sufficient for decoding the superposition of confirmation messages. 8. The transmitting station of claim 1, wherein: the receiver is configured to after receiving a confirmation message from at least one fourth receiving station with a second transmission power in accordance with the first feedback phase, receive a confirmation message in accordance with the second feedback phase and with a third transmission power; andwherein the third transmission power is higher than the second transmission power. 9. The transmitting station of claim 1, wherein the data is a data packet;wherein the transmitting station implements a retransmission protocol in a cellular radio communication system. 10. The transmitting station of claim 1, wherein the positive acknowledgement message indicates that the at the at least one second receiving station errorlessly decoded the data. 11. A receiving station for a data transmission system for point-to-multipoint data transmission from a transmitting station to a plurality of receiving stations, the receiving station comprising: a receiver configured to receive data sent from a transmitting station to a plurality of receiving stations;a transmitter configured to send a first confirmation message to the transmitting station;wherein the first confirmation message relates to a decoding of the received data at the receiving station;wherein the receiver is configured to receive a second confirmation message, sent from the transmitting station;wherein the second confirmation message relates to a decoding of the received data at another receiving station of the plurality of receiving stations, and the first and second confirmation messages being at least one of: a negative acknowledgement message indicating that the at least one second receiving station unsuccessfully decoded the received data, anda positive acknowledgement message indicating that the at least one second receiving station at least successfully decoded the received data;wherein the receiving station is configured to be at least logically grouped in at least a first and a second groups, on the basis of the path loss value between the receiving station and the transmitting station, andwherein the path loss value of the receiving stations of the first group is lower than the path loss value of the receiving stations of the second group, and wherein the receiving station is configured for sending the first confirmation message to the transmitting station in accordance with the first or the second feedback phases if the receiving station belongs to respectively the first or the second group;wherein the receiving station belongs to the second group and receives an indication that a negative acknowledgement has already been received by the transmitting station for the received data, from any other receiving station, the receiving station is configured to suppress sending a negative acknowledgement. 12. The receiving station of claim 11, wherein a sixth receiving station of the plurality of first receiving stations determines a fourth group of the plurality of groups of first receiving stations after receiving information about the number of groups of the first receiving stations available for grouping;wherein, after determination of the fourth group, the sixth receiving station considers itself to belong to the fourth group; andwherein the determination of the fourth group to which the sixth receiving station considers itself to belong to is performed by the sixth receiving station without additional signaling. 13. The transmitting station of claim 12, wherein the determination of the fourth group to which the sixth receiving station is assigned is performed on the basis of at least one of a random number generated by the sixth receiving station, a modulo operation applied to one of an IMSI and a TMSI of the sixth receiving station, and a determined path loss during the data transmission. 14. A method of operating a transmitting station for a point-to-multipoint data transmission to a plurality of first receiving stations, the method comprising the acts of: in a transmitting station: transmitting data from the transmitting station to a plurality of first receiving stations;receiving a confirmation message with respect to the data from at least one second receiving station of the plurality of first receiving stations, the confirmation message being at least one of: a negative acknowledgement message indicating that the at least one second receiving station unsuccessfully decoded the data, anda positive acknowledgement message indicating that the at least one second receiving station at least successfully decoded the transmitted data;transmitting the confirmation message to at least one third receiving station of the plurality of first receiving stations;at least logically grouping the first receiving stations into at least a first and a second groups of first receiving stations on the basis of the path loss values between the transmitting station and the first receiving stations, such that each group includes at least one receiving station of the plurality of first receiving stations, and wherein the path loss value of the receiving stations of the first group is lower than the path loss value of the receiving stations of the second group;assigning a first and a second predetermined feedback phases respectively to the first and to the second groups, wherein the second feedback phase occurs after the first feedback phase;receiving the confirmation message from the at least one second receiving station in accordance with the first or the second feedback phases when the second receiving station belongs to respectively the first or the second group,transmitting to at least one first receiving station of the second group, an indication that a negative acknowledgement has already been received by the transmitting station for the transmitted data, to suppresses receiving a negative acknowledgement. 15. A method of operating a receiving station for a data transmission system for point-to-multipoint data transmission from a transmitting station to a plurality of receiving stations, the method comprising the acts of: in a receiving station: receiving data via a receiver, from a transmitting station sending the data to a plurality of receiving stations;sending a message via a transmitter, including a first confirmation message sent to the transmitting station;wherein the first confirmation message relates to a decoding of the received data at the receiving station;receiving via the receiver, a second confirmation message sent from the transmitting station;wherein the second confirmation message relates to a decoding of the received data at another receiving station of the plurality of receiving stations, and the first and second confirmation messages being at least one of: a negative acknowledgement message indicating that the at least one second receiving station unsuccessfully decoded the received data, anda positive acknowledgement message indicating that the at least one second receiving station at least successfully decoded the received data;wherein the receiving station is configured to be at least logically grouped in at least a first and a second groups, on the basis of the path loss value between the receiving station and the transmitting station, andwherein the path loss value of the receiving stations of the first group is lower than the path loss value of the receiving stations of the second group, andwherein the first confirmation message is sent to the transmitting station in accordance with the first or the second feedback phases when the receiving station belongs to respectively the first or the second group;when the receiving station belongs to the second group and receives an indication that a negative acknowledgement has already been received by the transmitting station for the received data, from any other receiving station, the receiving station is configured to suppress sending a negative acknowledgement. 16. A computer-readable storage-medium that is not a transitory propagating signal or wave, the medium comprising control information including instructions for a method of operating a transmitting station for a point-to-multipoint data transmission to a plurality of receiving stations, the method comprising the acts of claim 14. 17. A computer-readable storage-medium that is not a transitory propagating signal or wave, the medium comprising control information including instructions for a method of operating a receiving station for receiving a point-to-multipoint data transmission from a transmitting station to a plurality of receiving stations, the method comprising the acts of claim 15.
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이 특허에 인용된 특허 (9)
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