Method and system for a data transmission in a communication system

• US 20040179469A1
• Filed: 03/13/2003
• Published: 09/16/2004
• Est. Priority Date: 03/13/2003
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Bhushan, Naga, Agrawal, Avneesh, Attar, Rashid Ahmed
• Application Number:
  US10/389,091
• Publication Number:
  US 20040179469A1
• Time in Patent Office: Days
• US Class Current: 370/208
• CPC Class Codes: H04J 11/0026 of multi-user interference
• CPC Class Codes: H04J 9/00 Multiplex systems in which each channel is represented by a different type of modulation of the carrier
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment

Abstract

An apparatus and a method enabling increased data throughput on the reverse link are disclosed.

Claims

1. A method for transmitting user data from a set of access terminals that transmit reverse link at a frequency, the method comprising:

receiving at each of a first and a second subset of the set of access terminals an assignment of a sequence of intervals, each interval being associated with a mode of multiple-access, wherein the second subset is mutually exclusive from the first subset;

receiving at each of the first subset of access terminals a scheduling decision for an interval associated with a first mode of multiple-access, the interval being divided into a first portion and a second portion, the first portion comprising overhead channels;

selecting at each of the first subset of access terminals a mode for data multiplexing, wherein

a first mode comprises building user data into only the first portion of the interval using multiplexing format;

a second mode comprises building user data only into at least one sub-division of the second portion of the interval, wherein each of the at least one sub-division is associated with multiplexing format; and

a third mode comprises building user data into the interval combining the first mode and the second mode; and

transmitting from at least one of the first subset of access terminals user data in the interval associated with the first mode of multiple-access using the selected mode of data multiplexing in accordance with the scheduling decision.

2. The method as claimed in claim 1 wherein the receiving at each of a first and a second subset of the set of access terminals an assignment of a sequence of intervals, each interval being associated with a mode of multiple-access, wherein the second subset is mutually exclusive from the first subset;

comprises;

receiving at each of the a first and a second subset of access terminals an assignment of a sequence of intervals, each interval being associated with a code-division multiple-access (CDMA) or a time-division multiple-access (TDMA).

3. The method as claimed in claim 2 wherein the receiving at each of a first subset of the set of access terminals a scheduling decision for an interval associated with a first mode of multiple-access comprises:

receiving at each of a first subset of the set of access terminals a scheduling decision for an interval associated with TDMA.

4. The method as claimed in claim 1 wherein the receiving at each of a first subset of the set of access terminals a scheduling decision for an interval associated with a first mode of multiple-access comprises:

receiving at each of the first subset of the set of access terminals at least a primary first channel;

extracting information from the received primary first channel; and

extracting optionally information from the received at least one supplemental first channel.

5. The method as claimed in claim 1 wherein the building user data into only the first portion of the interval using multiplexing format comprises:

building user data into only the first portion of the interval using code division multiplex (CDM).

6. The method as claimed in claim 1 wherein the building user data only into at least one sub-division of the second portion of the interval, wherein each of the at least one sub-division is associated with multiplexing format comprises:

building user data into at least one sub-division of the second portion of the interval, the at least one sub-division being determined in accordance with the scheduling decision.

7. The method as claimed in claim 6 wherein the building user data into at least one sub-division of a second portion of an interval, the at least one sub-division being determined in accordance with the scheduling decision comprises:

building user data into the entire second portion of the interval.

8. The method as claimed in claim 6 wherein the building user data into at least one sub-division of the second portion of the interval, the at least one sub-division being determined in accordance with the scheduling decision comprises:

extracting information from a received at least one supplemental first channel; and

determine the at least one sub-division in accordance with the extracted information.

9. The method as claimed in claim 1 wherein the building user data only into at least one sub-division of the second portion of the interval, wherein each of the at least one sub-division is associated with multiplexing format comprises:

building user data only into at least one sub-division of a second portion of an interval, wherein each of the least one sub-division is associated with one of code-division multiplex (CDM), time division multiplex (TDM), and orthogonal frequency division multiplex (OFDM).

10. The method as claimed in claim 9 wherein the building user data into the at least one sub-division associated with TDM comprises:

building user data into the at least one sub-division using TDM if a rate of user data is below a threshold.

11. The method as claimed in claim 10 further comprising:

building user data into the at least one sub-division using OFDM otherwise.

12. The method as claimed in claim 1 wherein the building user data into the interval combining the first mode and the second mode comprises:

building user data originated from a data source into the first portion of the interval and into the at least one sub-division of the second portion of the interval.

13. The method as claimed in claim 1 wherein the building user data into an interval combining the first mode and the second mode comprises:

building user data originated from a first data source into the first portion of the interval;

building user data originated from a second data source into at least one of the at least one sub-division of the second portion of the interval.

14. The method as claimed in claim 1 wherein the transmitting from at least one of the first subset of access terminals user data in the interval associated with the first mode of multiple-access using the selected mode of data multiplexing in accordance with the scheduling decision comprises:

extracting information from the received primary first channel;

transmitting the user data from access terminals in accordance with the extracted information.

15. The method as claimed in claim 1 wherein the transmitting from at least one of the first subset of access terminals user data in the interval associated with the first mode of multiple-access using the selected mode of data multiplexing in accordance with the scheduling decision comprises:

transmitting the user data from access terminals that received a permission to transmit.

16. The method as claimed in claim 1 wherein the transmitting from at least one of the first subset of access terminals user data in the interval associated with the first mode of multiple-access using the selected mode of data multiplexing in accordance with the scheduling decision comprises:

transmitting the user data from access terminals that selected the first mode of data multiplexing and received a denial to transmit.

17. The method as claimed in claim 1 further comprising:

transmitting from at least one of the second subset of access terminals user data in the interval associated with a first mode of multiple-access using the first mode of data multiplexing.

18. The method as claimed in claim 1 further comprising:

selecting at each of the second subset of access terminals a mode for data multiplexing, wherein

a third mode comprises building user data into only the first portion of the interval using multiplexing format;

a fourth mode comprises building user data only into the second portion of the interval using the multiplexing format; and

a third mode comprises building user data into the interval combining the first mode and the second mode; and

transmitting from at least one of the second subset of access terminals user data in the interval associated with the second mode of multiple-access using the selected mode of data multiplexing.

19. The method as claimed in claim 18 wherein the building user data into only the first portion of the interval using multiplexing format comprises:

building user data into only the first portion of the interval using a code division multiplex (CDM).

20. The method as claimed in claim 18 wherein the building user data into the interval combining the first mode and the second mode comprises:

building user data originated from a first data source in the first portion of the interval; and

building user data originated from a second data source using in the second portion of the interval.

21. The method as claimed in claim 18 wherein the building user data into the interval combining the first mode and the second mode comprises:

building user data originated from a first data source in the first portion of in the second portion of the interval.

22. The method as claimed in claim 1 further comprising:

transmitting the user data from a third subset of the set of access terminals;

said third subset being mutually exclusive from the first subset and the second subset.

23. The method as claimed in claim 22 wherein the transmitting the user data from a third subset of the set of access terminals;

said third subset being mutually exclusive from the first subset and the second subset comprises;

transmitting the user data using code division multiple access.

24. The method as claimed in claim 23 wherein the transmitting the user data using code division multiple access comprises:

transmitting the user data using code division multiple access in accordance with IS-856 standard.

25. An apparatus for transmitting user the user data from a set of access terminals transmitting a reverse link at the same frequency, the apparatus comprising:

a first set of access terminal, each of the first set of access terminals comprising;

a receiver;

a storage media configured to store instructions; and

at least one processor communicatively coupled to the receiver and the storage media, capable of processing a set of the instructions to;

process signals provided by the receiver to obtain an assignment of a sequence of intervals, each interval being associated with a mode of multiple-access;

process signals provided by the receiver to obtain a scheduling decision for an interval associated with a first mode of multiple-access;

the interval being divided into a first portion and a second portion, the first portion comprising overhead channels;

select a mode for data multiplexing, wherein

a first mode comprises building user data into only the first portion of the interval associated with a first mode of multiple-access using multiplexing format;

a second mode comprises building user data only into at least one sub-division of the second portion of the interval associated with a first mode of multiple-access, wherein each of the at least one sub-division is associated with multiplexing format; and

a third mode comprises building user data into the interval associated with a first mode of multiple-access by combining the first mode and the second mode; and

cause the transmitter to transmit user data in the interval associated with the first mode of multiple-access using the selected mode of data multiplexing in accordance with the scheduling decision

26. The apparatus as claimed in claim 25 wherein each interval is associated with a code division multiple-access (CDMA) or a time division multiple-access (TDMA).

27. The apparatus as claimed in claim 25 wherein the first mode of multiple-access comprises TDMA.

28. The apparatus as claimed in claim 25 wherein the receiver is configured to:

receive at least a primary first channel;

extract information from the received primary first channel;

optionally extract information from the received at least one supplemental first channel; and

provide the extracted information to the at least one processor.

29. The apparatus as claimed in claim 25 wherein the at least one processor causes building of user data into only the first portion of the interval associated with a first mode of multiple-access using multiplexing format by processing a set of instructions to:

cause building user data into only the first portion of the interval using code division multiplex (CDM).

30. The apparatus as claimed in claim 25 wherein the at least one processor causes building user data only into at least one sub-division of the second portion of the interval associated with a first mode of multiple-access, wherein each of the at least one sub-division is associated with multiplexing format by processing a set of instructions to:

determine the at least one sub-division in accordance with the scheduling decision; and

cause building user data into the determined at least one sub-division.

31. The apparatus as claimed in claim 30 wherein the at least one processor causes building user data into the determined at least one sub-division by processing a set of instructions to:

cause building user data into the entire second portion of the interval.

32. The apparatus as claimed in claim 30 wherein the at least one processor determines the at least one sub-division in accordance with the scheduling decision by processing a set of instructions to:

process the extracted information from the at least one supplemental first channel; and

determine the at least one sub-division in accordance with the extracted information.

33. The apparatus as claimed in claim 25 wherein the at least one processor causes building user data only into at least one sub-division of the second portion of the interval associated with a first mode of multiple-access by processing a set of instructions to:

associate each of the at least one sub-division of a second portion of the interval associated with a first mode of multiple-access with one of code-division multiplex (CDM), time division multiplex (TDM), and orthogonal frequency division multiplex (OFDM); and

cause building data into each of the at least one sub-division using the associated multiplex format.

34. The apparatus as claimed in claim 33 wherein the at least one processor causes building user data into the at least one sub-division associated with TDM by processing a set of instructions to:

cause building user data into the at least one sub-division using TDM if a rate of user data is below a threshold.

35. The apparatus as claimed in claim 33 wherein the at least one processor further processes a set of instructions to:

cause building user data into the at least one sub-division using OFDM otherwise.

36. The apparatus as claimed in claim 25 wherein the at least one processor causes building user data into the interval associated with a first mode of multiple-access by combining the first mode and the second mode by processing a set of instructions to:

cause building user data originated from a data source into the first portion of the interval associated with a first mode of multiple-access and into the at least one sub-division of the second portion of the interval associated with a first mode of multiple-access.

37. The apparatus as claimed in claim 25 wherein the at least one processor cause building user data into an interval associated with a first mode of multiple-access by combining the first mode and the second mode by processing a set of instructions to:

cause building user data originated from a first data source into the first portion of the interval associated with a first mode of multiple-access; and

cause building user data originated from a second data source into at least one of the at least one sub-division of the second portion of the interval associated with a first mode of multiple-access.

38. The apparatus as claimed in claim 25 wherein the at least one processor causes the transmitter to transmit user data in the interval associated with a first mode of multiple-access using the selected mode of data multiplexing in accordance with the scheduling decision by processing a set of instructions to:

process the extracted information from the received primary first channel; and

cause the transmitter to transmit the user data in accordance with the extracted information.

39. The apparatus as claimed in claim 25 wherein the at least one processor causes the transmitter to transmit user data in the interval associated with a first mode of multiple-access using the selected mode of data multiplexing in accordance with the scheduling decision by processing a set of instructions to:

cause the transmitter to transmit the user data when the scheduling decision is a permission to transmit.

40. The apparatus as claimed in claim 25 wherein the at least one processor causes the transmitter to transmit user data in the interval associated with a first mode of multiple-access using the selected mode of data multiplexing in accordance with the scheduling decision by processing a set of instructions to:

cause the transmitter to transmit the user data when the first mode of data multiplexing was selected and the scheduling decision is a denial to transmit.

41. The apparatus as claimed in claim 25 wherein the processor is further configured to process a set of instructions to:

transmitting from at least one of the second subset of access terminals user data in the interval associated with a first mode of multiple-access using the first mode of data multiplexing.

42. The apparatus as claimed in claim 25 wherein the processor is further configured to process a set of instructions to:

Ignore processing of signals provided by the receiver to obtain a scheduling decision for an interval associated with a second mode of multiple-access;

the interval being divided into a first portion and a second portion, the first portion comprising overhead channels;

select at each of the second subset of access terminals a mode for data multiplexing, wherein

a third mode comprises building user data into only the first portion of the interval associated with a second mode of multiple-access using multiplexing format;

a fourth mode comprises building user data only into the second portion of the interval using the multiplexing format; and

a third mode comprises building user data into the interval combining the first mode and the second mode; and

cause the transmitter to transmit user data in the interval associated with the second mode of multiple-access using the selected mode of data multiplexing.

43. The apparatus as claimed in claim 42 wherein the at least one processor causes building of user data into only the first portion of the interval associated with a second mode of multiple-access using multiplexing format by processing a set of instructions to:

cause building user data into only the first portion of the interval using code division multiplex (CDM).

44. The apparatus as claimed in claim 42 wherein the at least one processor causes building user data into the interval combining the first mode and the second mode by processing a set of instructions to:

cause building user data originated from a first data source in the first portion of the interval; and

cause building user data originated from a second data source using in the second portion of the interval.

45. The apparatus as claimed in claim 42 wherein the at least one processor causes building user data into the interval combining the first mode and the second mode by processing a set of instructions to:

cause building user data originated from a first data source in the first portion of in the second portion of the interval.

46. The apparatus as claimed in claim 25 further comprising:

a second set of access terminals, each of the second set of access terminals comprising;

a receiver;

a transmitter;

a storage media configured to store instructions; and

at least one processor communicatively coupled to the receiver and the storage media, capable of processing a set of the instructions to transmit the user data.

47. The apparatus as claimed in claim 46 wherein the user data are transmitted using code-division multiple access

48. The apparatus as claimed in claim 47 wherein the user data are transmitted using a code-division multiple-access in accordance with IS-856 standard.