Method Of Determining Feedback In A Communication System

• US 20080123578A1
• Filed: 11/07/2002
• Published: 05/29/2008
• Est. Priority Date: 11/07/2002
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Seidel, Eiko, Wengerter, Christian, Golitschek Edler Von Elbwart, Alexander
• Granted Patent: US 7,894,401 B2
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 2001/0098 Unequal error protection
• CPC Class Codes: H04L 27/3488 Multiresolution systems
• CPC Class Codes: H04N 21/234327 by decomposing into layers, e.g. base layer and one or more enhancement layers
• CPC Class Codes: H04N 21/238 Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams hybrid fiber coaxial [HFC] networks for downstream channel allocation for video distribution H04L12/2801; flow control in packet networks H04L47/10; real-time communication protocols in data switching networks H04L65/00; scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/44209 Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896
• CPC Class Codes: H04N 21/6131 involving transmission via a mobile phone network wireless downlink channel access H04W74/006
• CPC Class Codes: H04N 21/631 Multimode Transmission, e.g. transmitting basic layers and enhancement layers of the content over different transmission paths or transmitting with different error corrections, different keys or with different transmission protocols
• CPC Class Codes: H04N 21/6377 directed to server one-way streaming services wherein the source is controlled by the destination H04L65/613
• CPC Class Codes: H04N 21/6405 Multicasting data broadcast and multicast in packet switching networks H04L12/18
• CPC Class Codes: H04N 21/658 Transmission by the client directed to the server
• CPC Class Codes: H04N 21/6582 Data stored in the client, e.g. viewing habits, hardware capabilities, credit card number arrangements where receivers interact with the broadcast H04H20/38

Abstract

A method of determining feedback in a communication system, wherein data is transmitted from a transmitter to a receiver, and in response to data reception at the receiver, feedback is generated based on the received data comprising the step of classifying the data into data entities of different levels of importance and the step of determining feedback based on at least one data entity of one level of importance. The invention further relates to a corresponding receiver, transmitter and a respective communication system.

Claims

1. A method of determining feedback in a communication system, wherein data is transmitted from a transmitter to a receiver, and in response to data reception at the receiver, feedback is generated based on the received data comprising the steps of:

classifying the data into data entities of different levels of importance, and

determining feedback based on at least one data entity of one level of importance.

2. The method according to claim 1, wherein the step of classifying the data entities includes determining which data entities are required and/or are optional to satisfy a service requirement.

3. The method according to claim 1, wherein the levels of importance are predetermined or conveyed during setup of the transmission.

4. The method according to claim 1, wherein the levels of importance are dynamically varied during transmission and signalled from the transmitter to the receiver.

5. The method of claim 1, wherein the data entities of different levels of importance are assigned hierarchical transmission modes in multi-level modulation formats.

6. The method according to claim 1, wherein the data entities of different levels of importance are assigned hierarchical parts of the transmission data.

7. The method according to claim 1, wherein the communication system is a multi-cast transmission system comprising at least one data transmitter and multiple data receivers.

8. The method according to claim 7, wherein the feedback is transmitted at least from one designated multicast receiver.

9. The method according to claim 1, wherein the communication system is a wireless mobile communication system having a plurality of mobile receivers with different qualities of the received data.

10. The method according to claim 8, wherein the feedback is transmitted by the multicast receiver only if a QoS criterion for at least one data entity of one level of importance has not been met.

11. The method according to claim 1, wherein the data is transmitted using MPEG data compression, comprising frames or pictures having different levels of importance.

12. The method according to claim 1, wherein the feedback signifies positive or negative acknowledgements of received data packets.

13. The method according to claim 1, wherein the feedback requests control of at least one of the transmission parameters including transmission power, coding gain, modulation, data rate and error probability.

14. The method according to claim 1, wherein a adjustment of the power ratio between the data entities of different importance levels is effected.

15. The method according to claim 2, wherein the required data entities will be transmitted with increased power, while the optional data entities will be transmitted with decreased power, such that the combined transmitted power remains unchanged.

16. The method according to claim 1, wherein for data entities of different importance levels, different modulation schemes are selected.

17. The method according to claim 1, wherein for data entities of different importance levels uniform and non-uniform signal constellations are selected.

18. The method according to claim 1, wherein the signal constellation employed for modulation is selected such that a desired error resilience of the data entities is translated into the arrangement of the signal constellation points.

29. The method according to claim 9, wherein the feedback is transmitted by the multicast receiver only if a QoS criterion for at least one data entity of one level of importance has not been met.

30. The method according to claim 14, wherein the required data entities will be transmitted with increased power, while the optional data entities will be transmitted with decreased power, such that the combined transmitted power remains unchanged.

19. A receiver in a communication system, wherein data is transmitted to a receiver and in response to data reception, the receiver generates feedback for retransmission to the transceiver, comprising:

means for classifying the received data into data entities of different levels of importance, and

means for determining feedback based on at least one data entity of one level of importance.

20. The receiver according to claim 19, wherein the means for classifying comprise means for determining which data entities are required and/or are optional to satisfy a service requirement.

21. The receiver according to claim 19, further comprising means for storing criteria which define the levels of importance, or for storing the levels of importance, which are signalled from the transmitter.

26. A communication system comprising (a) a transmitter, and (b) a receiver according to claim 19, wherein data is transmitted from the transmitter to the receiver and in response to data reception at the receiver, feedback is generated based on the received data, the transmitter comprising means for classifying the data into data entities of different levels of importance, and signalling criteria defining the levels of importance, or signalling the levels of importance, to the receiver.

27. The communication system according to claim 26, wherein the communication system is a multicast transmission system, comprising at least one data transmitter and multiple data receivers.

28. The communication system according to claim 26, wherein the communication system is a wireless mobile communication system having a plurality of mobile receivers with different qualities of the received data.

33. The communication system according to claim 27, wherein the communication system is a wireless mobile communication system having a plurality of mobile receivers with different qualities of the received data.

34. The communication system according to claim 26, wherein the means for classifying comprise means for determining which data entities are required and/or are optional to satisfy a service requirement.

35. The communication system according to claim 26, wherein the receiver further comprises means for storing criteria which define the levels of importance, or for storing the levels of importance, which are signaled from the transmitter.

36. The communication system according to claim 26, wherein the criteria defining the levels of importance, or the levels of importance, are dynamically varied according to at least one of the transmission parameters including transmission power, coding gain, modulation, data rate and error probability.

37. The communication system according to claim 26, wherein the transmitter uses MPEG data compression comprising frames or pictures having different levels of importance.

22. A transmitter in a communication system, wherein data is transmitted from the transmitter to the receiver and in response to data reception at the receiver, feedback is generated based on the received data, comprising:

means for classifying the data into data entities of different levels of importance, and

signalling criteria defining the levels of importance, or signalling the levels of importance, to the receiver.

23. The transmitter according to claim 22, wherein the means for classifying comprise means for determining which data entities are required and/or are optional to satisfy a service requirement.

24. The transmitter according to claim 22, wherein the criteria defining the levels of importance, or the levels of importance, are dynamically varied according to at least one of the transmission parameters including transmission power, coding gain, modulation, data rate and error probability.

25. The transmitter according to claim 22, wherein the transmitter uses MPEG data compression comprising frames or pictures having different levels of importance.

31. The transmitter according to claim 23, wherein the transmitter uses MPEG data compression comprising frames or pictures having different levels of importance.

32. The transmitter according to claim 24, wherein the transmitter uses MPEG data compression comprising frames or pictures having different levels of importance.