Data rate methods and apparatus

• US 8,306,541 B2
• Filed: 09/19/2005
• Issued: 11/06/2012
• Est. Priority Date: 03/08/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Laroia, Rajiv, Jin, Hui, Richardson, Tom, Li, Junyi
• Primary Examiner(s): Eng, George
• Assistant Examiner(s): HUYNH, NAM TRUNG
• Application Number:
  US11/230,331
• Publication Number:
  US 20060203765A1
• Time in Patent Office: 2,605 Days
• Field of Search: 455418-420, 455/424, 455/561, 455450-453, 455/455, 455/522, 370/232, 370/235, 370/328, 370/329, 370335-336
• US Class Current: 455/450
• CPC Class Codes: H04W 28/22 Negotiating communication rate

Abstract

A wireless terminal receives an uplink traffic channel segment assignment including a maximum uplink rate option indicator. Each uplink rate option corresponds to a number of information bits, coding rate and modulation method. The maximum rate option indicator indicates the highest rate option that the wireless terminal is permitted to use when transmitting in the assigned traffic channel segment from the perspective of the base station. In some embodiments, the wireless terminal uses interference measurements to further quality, e.g., conditionally reduce, the maximum uplink rate option that may be used. Then, the wireless terminal selects an uplink rate option to use which is less than the determined allowed maximum uplink rate option, e.g., based on the amount of user data to communicate. The wireless terminal transmits data in the assigned uplink traffic channel segment in accordance with the wireless terminal selected uplink rate.

Claims

1. A method of operating a wireless terminal comprising:

receiving an uplink traffic channel segment assignment of a corresponding uplink traffic channel segment to said wireless terminal, said uplink traffic channel segment assignment including a maximum uplink rate option indicator, said maximum uplink rate option indicator including a value which can be used to determine an indicated maximum uplink rate option;

determining the indicated maximum uplink rate option from said value included in said maximum uplink rate option indicator and additional information known to said wireless terminal, said value corresponding to multiple possible maximum uplink rate options, said additional information including information indicating which one of a plurality of assignment channels, used to communicate unlink traffic channel segment assignments, said uplink traffic channel segment assignment was received in; and

transmitting data in the assigned uplink traffic channel segment in accordance with one of a plurality of rate options corresponding to said indicated maximum uplink rate option.

2. The method of claim 1,

wherein said additional information further includes interference information transmitted by said wireless terminal;

and

wherein determining the indicated maximum uplink rate option from said value included in said maximum uplink rate option indicator and additional information known to said wireless terminal includes;

distinguishing between a plurality of possible maximum uplink rate options to which said value included in same maximum uplink rate option indicator may correspond based on said interference information to thereby determine the indicated maximum uplink rate option.

3. The method of claim 2, wherein said interference information is a beacon ratio report.

4. The method of claim 1, further comprising:

selecting the one of the plurality of rate options from a plurality of predetermined rate options corresponding to said indicated maximum uplink rate option, prior to performing said transmitting step.

5. The method of claim 4, further comprising:

storing information indicating a mapping between each of said plurality of rate options and an encoding method, at least two of the plurality of rate options corresponding to coding different numbers of information bits in the assigned segment.

6. The method claim 4, further comprising:

storing information indicating a mapping between each of said plurality of rate options and a modulation method.

7. The method of claim 6, wherein at least two of said plurality of rate options corresponds to different modulation methods.

8. The method of claim 7, wherein said different modulation methods include QPSK and QAM16.

9. The method of claim 4, further comprising:

receiving additional traffic channel, segment assignments from a base station indicating assignments of additional traffic channel segments to said wireless terminal, each of said additional traffic channel segment assignments include a maximum uplink rate option indicator, said base station being the same base station which transmitted said uplink traffic channel segment assignment.

10. The method of claim 9, wherein at least one of said additional traffic channel segment assignments includes a maximum uplink rate option indicator that corresponds to a single predetermined uplink rate option.

11. The method of claim 10, further comprising:

transmitting in a traffic channel segment corresponding to said at least one of said additional traffic channel segment assignments in accordance with the single predetermined rate option.

12. The method of claim 11, wherein said single predetermined rate option corresponds to the lowest traffic channel uplink data rate option which can be indicated by the maximum uplink rate option indicator.

13. The method of claim 12, further comprising:

storing modulation information indicating that QPSK modulation should be used when transmitting data in a traffic channel for which use, of the lowest rate option is indicated.

14. The method of claim 9, wherein at least 8 different maximum uplink rate options can be indicated.

15. The method of claim 14, wherein said maximum uplink rate option indicator is a 3 bit indicator and wherein said wireless terminal includes information associating each of the 8 values which can be indicated with information indicating different numbers of information bits to be coded into the segment.

16. The method of claim 15, wherein the maximum uplink rate option indicator is communicated as part of an OFDM signal.

17. The method of claim 1, wherein the maximum uplink rate option indicator is communicated in the received signal using fewer bits than the number of bits required to signal to uniquely identify each of the selectable uplink rate options.

18. The method of claim 1, wherein the maximum uplink rate option indicator is a single bit if it was communicated using a first assignment channel and 3 bits if it is communicated using a second assignment channel, the single bit single being communicated using non-coherent modulation, the 3 bits being communicated using coherent modulation.

19. The method of claim 1, wherein said additional information is information that indicates whether the maximum uplink rate option indicator was received in a first assignment channel or another assignment channel, uplink traffic channel segment assignment signals received in the first assignment channel being communicated using non-coherent modulation, uplink traffic channel segment assignment signals received in the another assignment channel being communicated using coherent modulation.

20. A method of operating a wireless terminal comprising:

receiving an uplink traffic channel segment assignment of a corresponding uplink traffic channel segment to said wireless terminal, said uplink traffic channel segment assignment including a maximum uplink rate option indicator, said maximum uplink rate option indicator including a value which can be used to determine an indicated maximum uplink rate option;

determining the indicated maximum uplink rate option from said value included in said maximum uplink rate optibn indicator and additional information known to said wireless terminal, said additional information including information indicating which one of a plurality of assignment channels said uplink traffic channel segment assignment was received in;

transmitting data in the assigned uplink traffic channel segment in accordance with one of a plurality of rate options corresponding to said indicated maximum uplink rate option; and

wherein said additional information is information indicating whether the maximum uplink rate option indicator was received in a first or second assignment channel, uplink traffic channel segment assignment signals received in the first assignment channel being communicated using non-coherent modulation, uplink traffic channel segment assignment signals received in the second assignment channel being communicated using coherent modulation.

21. A method of operating a wireless terminal comprising:

receiving an uplink traffic channel segment assignment of a corresponding uplink traffic channel segment to said wireless terminal, said uplink traffic channel segment assignment including a maximum uplink rate option indicator, said maximum uplink rate option indicator including a value which can be used to determine an indicated maximum uplink rate option;

determining the indicated maximum uplink rate option from said value included in said maximum uplink rate option indicator and additional information known to said wireless terminal, said additional information including information indicating which one of a plurality of assignment channels said uplink traffic channel segment assignment was received in;

transmitting data in the assigned uplink traffic, channel segment in accordance with one of a plurality of rate options corresponding to said indicated maximum uplink rate option; and

wherein said additional information is information indicating whether the maximum uplink rate option indicator was received in a first or second assignment channel, uplink traffic channel segment assignment signals received in the first assignment channel including multiple bits used to communicate said value, uplink traffic channel segment assignment signals received in the second channel being single bit assignment signals;

wherein when said uplink traffic channel segment assignment signal is received in the first assignment channel, determining the indicated maximum uplink rate option from said value includes determining the maximum uplink rate option indicator from a direct one to one mapping between said value and one of a plurality of possible uplink rate options which may be indicated; and

wherein when said uplink traffic channel segment assignment signal is received in the second assignment channel, determining the indicated maximum uplink rate option from said value includes determining the maximum uplink rate option indicator from one of a plurality of possible uplink rate options to which said value may map based on a report generated by said wireless terminal.

22. A wireless terminal comprising:

a receiver for receiving an uplink traffic channel segment assignment of a corresponding uplink traffic, channel segment to said wireless terminal, said uplink traffic channel segment assignment including a maximum uplink rate option indicator, said maximum uplink rate option indicator including a value which can be used to determine an indicated maximum uplink rate option;

a determination module for determining the indicated maximum uplink rate option from said value included in said maximum uplink rate option indicator and additional information known to said wireless terminal, said value corresponding to multiple possible maximum uplink rate options, said additional information including information indicating which one of a plurality of assignment channels, used to communicate uplink traffic channel segment assignments, said uplink traffic channel segment assignment was received in; and

a transmitter for transmitting data in the assigned uplink traffic channel segment in accordance with one of a plurality of rate options corresponding to said indicated maximum uplink rate option.

23. The wireless terminal of claim 22, wherein the maximum uplink rate option indicator is a single bit if it was communicated using a first assignment channel and 3 bits if it is communicated using a second assignment channel, the single bit single being communicated using non-coherent modulation, the 3 bits being communicated using coherent modulation.

24. The wireless terminal of claim 22, further comprising:

a selection module for selecting the one of the plurality of rate options from a plurality of predetermined rate options corresponding to said indicated maximum uplink rate option, prior to transmitting data in the assigned uplink traffic channel segment in accordance with the one of a plurality of rate options.

25. The wireless terminal of claim 24, further comprising:

stored information indicating a mapping between each of said plurality of rate options and an encoding method, at least two of the plurality of rate options corresponding to coding different numbers of information bits in the assigned segment.

26. The wireless terminal of claim 24, further comprising:

additional stored information indicating a correspondence between each of said plurality of rate options and a modulation method.

27. The wireless of claim 26, wherein at least two of said plurality of rate options corresponds to different modulation methods.

28. The wireless terminal of claim 27, wherein said different modulation methods include QPSK and QAM16.

29. The wireless terminal of claim 24, further comprising:

said receiver including means for processing additional received traffic channel segment assignments from a base station indicating assignments of additional traffic channel segments to said wireless terminal, each of said additional traffic channel segment assignments including within the segment assignment maximum uplink rate option indicator, said base station being the same base station which transmitted said uplink traffic channel segment assignment.

30. The wireless terminal of claim 29, wherein at least one of said additional traffic channel segment assignments includes a maximum uplink rate option indicator that corresponds to a single, predetermined uplink rate option.

31. The wireless terminal of claim 30, wherein said transmitter includes:

means for transmitting in a traffic channel segment corresponding to said at least one of said additional traffic channel segment assignments in accordance with the single predetermined rate option.

32. The wireless terminal of claim 31, wherein said, single predetermined rate option corresponds to the lowest traffic channel uplink data rate option which can be indicated by the maximum uplink rate option indicator.

33. The wireless terminal of claim 22, wherein the maximum uplink rate option indicator is communicated in the received signal using fewer bits than the number of bits required to signal to uniquely identify each of the selectable uplink rate options.

34. The wireless terminal of claim 22, wherein the maximum uplink rate option indicator includes one bit if it was communicated using a first signaling method and 3 bits if it is communicated using a second signaling method.

35. A wireless terminal comprising:

a receiver for receiving an uplink traffic channel segment assignment of a corresponding uplink traffic channel segment to said wireless terminal, said uplink traffic channel segment assignment including a maximum uplink rate option indicator, said maximum uplink rate option indicator including a value which can be used to determine an indicated maximum uplink rate option;

a determination module, coupled to said receiver, for determining the indicated maximum uplink rate option from said value included in said maximum uplink rate option indicator and additional information known to said wireless terminal, said additional information including information indicating which one of a plurality of assignment channels said uplink traffic channel segment assignment was received in;

a transmitter for transmitting data in the assigned uplink traffic channel segment in accordance with one of a plurality of rate options corresponding to said indicated maximum uplink rate option;

a data storage device for storing said additional information, said additional information indicating whether the maximum uplink rate option indicator was received in a first or second assignment channel, uplink traffic channel segment assignment signals received in the first assignment channel including multiple bits used to communicate said value, uplink traffic channel segment assignment signals received in the second assignment channel being signal bit assignment signals;

wherein when said uplink traffic channel segment assignment signal is received in the first assignment channel, said determination module determines the indicated maximum uplink rate option from said value by determining the maximum uplink rate option indicator from a direct one to one mapping between said value and one of a plurality of possible uplink rate options which may be indicated; and

wherein when said uplink traffic channel segment assignment, signal is received in the second assignment channel, said determination module determines the indicated maximum uplink rate option from said value by determining the maximum uplink rate option indicator from one of a plurality of possible uplink rate options to which said value may map based on a report generated by said wireless terminal.

36. The wireless terminal of claim 35, wherein said data storage device further includes stored interference information.

37. A wireless terminal, comprising:

means for receiving an uplink traffic channel segment assignment of a corresponding uplink traffic channel segment to said wireless terminal, said uplink, traffic channel segment assignment including a maximum uplink rate option indicator, said maximum uplink rate option indicator including a value which can be used to determine an indicated maximum uplink rate option;

means for determining the indicated maximum uplink rate option from said value included in said maximum uplink rate option indicator and additional information known to said wireless terminal, said value corresponding to multiple possible maximum uplink rate options, said additional information including information indicating which one of a plurality of assignment channels, used to communicate uplink traffic channel segment assignments, said uplink traffic channel segment assignment was received in; and

means for transmitting data in the assigned uplink traffic channel segment in accordance with one of a plurality of rate options corresponding to said indicated maximum uplink rate option.

38. The wireless terminal of claim 37, further comprising:

means for determining that said received uplink traffic channel segment assignment is an assignment for said wireless terminal from a wireless terminal identifier included in said received assignment.

39. The wireless terminal of claim 37, wherein said additional information is information indicating whether the maximum uplink rate option indicator was received in a first or second assignment channel, uplink traffic channel segment assignment signals received in the first assignment channel being communicated using non-coherent modulation, uplink traffic channel segment assignment signals received in the second assignment channel being communicated using coherent modulation.

40. The wireless terminal of claim 37, wherein the maximum uplink rate option indicator is a single bit if it was communicated using a first assignment channel and 3 bits if it is communicated using a second assignment channel, the single bit single being communicated using non-coherent modulation, the 3 bits being communicated using coherent modulation.

41. A device comprising a processor configured to control a wireless terminal to:

receive an uplink traffic channel segment assignment of a corresponding uplink traffic channel segment to said wireless terminal, said uplink traffic channel segment assignment including a maximum uplink rate option indicator, said maximum uplink rate option indicator including a value which can be used to determine an indicated maximum uplink rate option;

determine the indicated maximum uplink rate option from said value included in said maximum uplink rate option indicator and additional information known to said wireless terminal, said value corresponding to multiple possible maximum uplink rate options, said additional information including information indicating which one of a plurality of assignment channels, used to communicate uplink traffic channel segment assignments, said uplink traffic channel segment assignment was received in; and

transmit data in the assigned uplink traffic channel segment in accordance with one of a plurality of rate options corresponding to said indicated maximum uplink rate option.

42. The device of claim 41, wherein the processor is further configured to control a wireless terminal to:

determine that said received uplink traffic channel segment assignment is an assignment for said wireless terminal from a wireless terminal identifier included in said received assignment; and

wherein said additional information is information indicating whether the maximum uplink rate option indicator was received in a first or second assignment channel, uplink traffic channel segment assignment signals received in the first assignment channel being communicated using non-coherent modulation, uplink traffic channel segment assignment signals received in the second assignment channel being communicated using coherent modulation.

43. The device of claim 41, wherein the maximum uplink rate option indicator is a single bit if it was communicated using a first assignment channel and 3 bits if it is communicated using a second assignment channel, the single bit single being communicated using non-coherent modulation, the 3 bits being communicated using coherent modulation.

44. A non-transitory machine readable medium embodying machine executable instructions for controlling a wireless terminal, the non-transitory machine readable medium comprising:

instructions for causing said wireless terminal to receive an uplink traffic channel segment assignment of a corresponding uplink traffic channel segment to said wireless terminal, said uplink traffic-channel segment assignment including a maximum uplink rate option indicator, said maximum uplink rate option indicator including a value which can be used to determine an indicated maximum uplink rate option;

instructions for causing said wireless terminal to determine the indicated maximum uplink rate option from said value included in said maximum uplink rate option indicator and additional, information known to said wireless terminal, said value corresponding to multiple possible maximum uplink rate options, said additional information including information indicating which one of a plurality of assignment channels, used to communicate uplink traffic channel segment assignments, said uplink traffic channel segment assignment was received in; and

instructions for causing said wireless terminal to transmit data in the assigned uplink traffic channel segment in accordance with one of a plurality of rate options corresponding to said indicated maximum uplink rate option.

45. The non-transitory machine readable medium of claim 44, further comprising:

instructions for causing said wireless terminal to determine that said received uplink traffic channel segment assignment is an assignment for said wireless terminal from a wireless terminal identifier included in said received assignment; and

wherein said additional information is information indicating whether the maximum uplink rate option indicator was received in a first or second assignment channel, uplink traffic channel segment assignment signals received in the first assignment channel being communicated using non-coherent modulation, uplink traffic channel segment assignment signals received in the second assignment channel being communicated using coherent modulation.

46. The non-transitory machine readable medium of claim 44, wherein the maximum uplink rate option indicator is a single bit if it was communicated using a first assignment channel and 3 bits if it is communicated using a second assignment channel, the single bit single being communicated using non-coherent modulation, the 3 bits being communicated using coherent modulation.