Data transmission method
View Patent ↗A method for transmitting data via a data transmission channel in a communication network. The transmission channel is made available for the wireless transmission between a transmitter and a receiver. The data transmission is carried out while taking into consideration the channel quality in such a manner that the channel quality data available during transmission is as current as possible and no unnecessary transmission of channel quality data is required.
1. A method for transmitting data between a transmitter and a receiver via a transmission channel in a communications network for achieving wireless transmission, comprising:
transferring repeatedly channel quality information from the receiver to the transmitter;
determining an activity status for the data transmission by the receiver;
determining a time interval from the last completed transfer of channel quality information;
transferring a further channel quality information item from the receiver to the transmitter when a first activity status exists and the time interval exceeds a defined first time; and
transferring an individual channel quality information item more than once in identical form, and choosing a time interval between these two transfers such that it is at least equal to a period of time which is required in total for the multiple identical transmissions of the channel quality information.
2. The method according to claim 1 , wherein a repeated transfer of channel quality information takes place from the receiver to the transmitter, and individual channel quality information items are transmitted more than once in identical form, the defined first time interval being chosen such that no collisions occur between repeated transfers, further transfers of channel quality information or multiple identical transfers.
3. The method according to claim 1 , wherein the transmitter is a base station and the receiver is a terminal, or vice versa.
4. The method according to claim 3 , wherein the terminal has a transmit/receive unit for transmitting and receiving data over a radio path and a processor unit which is equipped for executing data transmission.
5. The method according to claim 4 , wherein the base station has a transmit/receive unit for transmitting and receiving data over a radio path, having a link to a communications network and a processor unit which is equipped for executing a the method.
6. The method according to claim 5 , wherein the communications network includes the terminal and base station.
7. The method according to claims 1 , wherein the further channel information is sent if the first activity status has already occurred n times.
8. The method according to claim 7 , wherein the predetermined points in time or the number n are predetermined by a transmitter in the form of a base station or/and by the communications network.
9. The method according to claim 1 , wherein a time interval from the last completed transfer is ascertained and a transfer takes place if this time interval exceeds a defined first time interval.
10. The method according to claim 1 , wherein the data transmission takes place in packet-switched fashion.
11. The method according to claim 1 , wherein the activity status comprises a first status in which at least one data packet arrives at the receiver or its arrival is signaled and a second status in which no data packet arrives at the receiver and no arrival is signaled either.
12. The method according to claim 1 , wherein the first time interval is defined depending on the activity status.
13. The method according to claim 1 , wherein the repeated transfer of the channel quality information takes place at predetermined points in time.
14. The method according to claim 1 , wherein the repeated transfer takes place cyclically at least in part.
15. The method according to claim 1 , wherein the channel quality information is ascertained by way of at least one measurement, in particular immediately before a transfer of channel quality information in the receiver.
16. The method according to claim 1 , wherein the communications network is a mobile radio network which functions in accordance with the UMTS standard and the data transmission method in question is HSDPA.
17. A method for transmitting data between a transmitter and a receiver via a transmission channel in a communications network for achieving wireless transmission, comprising:
transferring repeatedly channel quality information from the receiver to the transmitter;
determining an activity status for the data transmission by the receiver;
determining a time interval from the last completed transfer of channel quality information;
transferring a further channel quality information item from the receiver to the transmitter when a first activity status exists and the time interval exceeds a defined first time interval; and
determining a time interval to the next predetermined transfer of channel quality information and if this time interval falls below a second defined time interval the transfer of the further channel quality information does not take place.