Resource allocation in communication networks

• US 7,697,948 B2
• Filed: 10/29/2004
• Issued: 04/13/2010
• Est. Priority Date: 10/29/2004
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Tsai, Shiau-He Shawn, Wan, Lei, Almgren, Magnus
• Primary Examiner(s): LEE, JOHN J
• Application Number:
  US11/577,540
• Publication Number:
  US 20070298822A1
• Time in Patent Office: 1,992 Days
• Field of Search: 455/509, 455/452.1, 455/450, 455/452.2, 455/512, 455/517, 455/437, 455/412.2, 455/511, 455/63.1, 455/67.13, 455/67.11, 455/115.1, 455/115.3, 370/328, 370/335
• US Class Current: 455/509
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A method of adapting resource allocation parameters to reach one or more quality targets with improved accuracy is proposed. New information measurements based on the so-called mutual information, preferably at block-level, are introduced. The MI-based information measurements of a previous transmission, the channel prediction of a subsequent transmission and one or more quality requirements, are used to determine the amount and type of resources, e.g. time, frequency and power resources, that are to be used for the subsequent transmission. The resource allocation can for example comprise power allocation and/or link adaptation and the invention enables an advantageous implementation with cooperative link-adaptation and power allocation. The proposed method is useful in connection with ARQ/HARQ retransmissions.

Claims

1. A method for allocating resources to communication links, comprising the steps of:

determining a current value of a quality indicator for a signal transmitted over a communication link from a transmitting unit to a receiving unit based on a mutual information relationship, comprising the steps of;

modeling mutual information parameters at a symbol-level using a modulation model with a representation of the signal-to-interference ratio as input; and

,

combining the mutual information parameters into block-level mutual information; and

,

deciding resource allocation for the communication link in response to the current value of the quality indicator.

2. The method of claim 1, wherein the quality indicator represents the mutual information of the signal at block-level.

3. The method of claim 1, wherein link information of the signal measured at the receiving unit is used as input in the step of determining the quality indicator.

4. The method of claim 1, wherein the quality indicator represents total coded bit information of a received block.

5. The method of claim 1, wherein the quality indicator represents total decoded bit information of a received block.

6. The method of claim 1, wherein the step of determining the quality indicator further comprises the step of determining the quality indicator at block-level based on a coding model independent of said modulation model and using the combined block-level mutual information.

7. The method of claim 1, wherein the step of deciding resource allocation in turn comprises:

comparing the current value of the quality indicator with, a target value of the quality indicator; and

allocating resources based on the difference between the current value and the target value of the quality indicator.

8. The method of claim 1, wherein the step of deciding resource allocation is further based on at least one quality of service requirement selected from the group of:

BLER;

packet transmission delay;

delay jitter;

residue BER and service priority.

9. The method of claim 1, wherein the resource allocation comprises power allocation to the communication link.

10. The method of claim 9, used with HARQ-Chase Combining and comprising power allocation to reach a target value of a representation of the total coded bit information of a received block.

11. The method of claim 1, wherein the resource allocation comprises adaptation of the communication link with regard to at least one link-defining parameter.

12. The method of claim 11, comprising adaptation of a link-defining parameter selected from the group of:

coding rate, coding mode, and modulation mode.

13. The method of claim 12, used with HARQ-Incremental Redundancy and comprising coding rate adaptation to reach a target value of a representation of the total decoded bit information of a received block.

14. The method of claim 12, comprising modulation mode adaptation and coding rate adaptation performed separately.

15. The method of claim 11, wherein the link adaptation comprises allocating channels to respective users.

16. The method of claim 1, wherein the resource allocation comprises cooperative link adaptation and power allocation.

17. The method of claim 1, further comprising the steps of:

calculating the quality indicator at the receiving unit; and

sending a resource allocation control command corresponding to the decided resource allocation from the receiving unit to the transmitting unit, whereby resources can be allocated at the transmitting unit in accordance with the control command.

18. The method of claim 1, further comprising the steps of:

receiving, at the transmitting unit, link information from the receiving unit for calculation of the quality indicator;

calculating the quality indicator at the transmitting unit; and

allocating resources at the transmitting unit based on a resource allocation decision by the transmitting unit.

19. The method of claim 1, further comprising the steps of:

receiving, at an external control unit, link information from the receiving unit for calculation of the quality indicator;

calculating the quality indicator at the external control unit; and

sending a resource allocation control command corresponding to the decided resource allocation from the external control unit to the transmitting unit, whereby resources can be allocated at the transmitting unit in accordance with the control command.

20. A communication unit in a system with means for allocating resources to communication links, comprising:

means for determining a current value of a quality indicator for a signal transmitted over a communication link based on a mutual information relationships, wherein the means for determining the quality indicator comprises;

means for modeling mutual information parameters at symbol-level including a modulation model with a representation of the signal-to-interference ratio as input; and

,

means for combining the mutual information parameters into block-level mutual information; and

,

means for deciding resource allocation for the communication link in response to the current value of the quality indicator.

21. The communication unit of claim 20, wherein the quality indicator represents the mutual information of the signal at block-level.

22. The communication unit of claim 20, wherein measured link information of the signal is used as input in determining the quality indicator.

23. The communication unit of claim 20, wherein the quality indicator represents total coded bit information of a received block.

24. The communication unit of claim 20, wherein the quality indicator represents total decoded bit information of a received block.

25. The communication unit of claim 20, wherein the means for determining at least one quality indicator further comprises means for determining the quality indicator at block- level based on a coding model independent of said modulation model and using the combined block-level mutual information.

26. The communication unit of claim 20, wherein the means for deciding resource allocation in turn comprises:

means for comparing the current value of the quality indicator with a target value of the quality indicator; and

means for allocating resources based on the difference between the current value and the target value of the quality indicator.

27. The communication unit of claim 20, wherein the means for deciding resource allocation uses at least one quality of service requirement selected from the group of:

BLER;

packet transmission delay;

delay jitter;

residue BER and service priority.

28. The communication unit of claim 20, wherein the resource allocation comprises power allocation to the communication link.

29. The communication unit of claim 28, used with HARQ-Chase Combining and comprising means for power allocation to reach a target value of a representation of the total coded bit information of a received block.

30. The communication unit of claim 20, wherein the resource allocation comprises adaptation of the communication link with regard to at least one link-defining parameter.

31. The communication unit of claim 30, further comprising adaptation of a link-defining parameter selected from the group of:

coding rate, coding mode, and modulation mode.

32. The communication unit of claim 31, adapted for operation with HARQ-Incremental Redundancy and comprising coding rate adaptation to reach a target value of a representation of the total decoded bit information of a received block.

33. The communication unit of claim 31, further comprising means for separate modulation mode adaptation and coding rate adaptation.

34. The communication unit of claim 20, wherein the resource allocation comprises cooperative link adaptation and power allocation.

35. The communication unit of claim 20, further comprising:

means for receiving the signal from a transmitting unit over the communication link; and

means for sending a resource allocation control command corresponding to the decided resource allocation to the transmitting unit, whereby resources can be allocated at the transmitting unit in accordance with the control command.

36. The communication unit claim 20, further comprising:

means from transmitting the signal to a receiving unit over the communication link;

means for determining the current value of the quality indicator using link information from the receiving unit; and

means for resource allocation in accordance with the decided resource allocation.

37. The communication unit of claim 20, further comprising:

means for determining the current value of the quality indicator for the signal transmitted over the communication link from a transmitting unit to a receiving unit using link information from the receiving unit; and

,

means for sending a resource allocation control command corresponding to the decided resource allocation to the transmitting unit, whereby resources can be allocated at the transmitting unit in accordance with the control command.

38. A communication system with means for allocating resources to communication links, comprising a communication unit according to claim 20.