Method, apparatus, and communications interface for sending and receiving data blocks associated with different multiple access techniques

• US 7,453,856 B2
• Filed: 09/03/2004
• Issued: 11/18/2008
• Est. Priority Date: 09/03/2004
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Guey, Jiann-Ching
• Primary Examiner(s): Kincaid; Lester
• Assistant Examiner(s): MITCHELL, NATHAN A
• Application Number:
  US10/933,503
• Publication Number:
  US 20060050664A1
• Time in Patent Office: 1,537 Days
• Field of Search: 370/229, 370/431, 370/464, 370/335, 370/338, 370/342, 455/3.01, 455/418, 455/446
• US Class Current: 370/336
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0042 intra-user or intra-terminal allocation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource

Abstract

A unified and flexible signaling method and radio interface accommodate different multiple access schemes, e.g, FDMA, TDMA, CDMA, OFCDM, and IFDMA. Each user data unit is associated with one of several different multiple access techniques that defines how multiple users access communication resources. Each user data unit is processed into discrete samples, where the discrete samples for each user data unit are assigned to one or more respective discrete signal blocks. Discrete samples associated with different multiple access techniques are processed and grouped together into a time slot or packet for transmission over a communication channel.

Claims

1. A communications method, comprising:

processing each of multiple user data units into discrete samples, where each user data unit is associated with one of plural different multiple access techniques, where each multiple access technique defines how each of multiple user data units is processed into discrete samples and allocated in a time-frequency plane;

assigning the discrete samples for each user data unit to one or more respective discrete signal blocks; and

grouping together discrete signal blocks containing multiple user data units having different associated multiple access techniques for transmission over a communications channel,

wherein the grouping includes grouping discrete signal blocks containing the discrete samples associated with the multiple user data units having different associated multiple access techniques into a time-slot or a packet for transmission over the communications channel.

2. The method in claim 1, wherein the processed user data units in the group correspond to plural users or to the same user.

3. The method in claim 1, wherein the multiple access techniques include one or more of the following:

frequency division multiple access (FDMA) techniques, time division multiple access (TDMA) techniques, and code division multiple access (CDMA) techniques.

4. The method in claim 3, wherein the FDMA techniques include orthogonal frequency division multiplexing (OFDM), orthogonal frequency code division multiplexing (OFCDM), and interleaved-FDMA (IFDMA), and wherein the CDMA techniques include direct sequence (DS)-CDMA and multi-carrier DS-CDMA.

5. The method in claim 1, further comprising:

transmitting the grouped discrete signal blocks over the communications channel.

6. The method in claim 1, further comprising:

adding a cyclic prefix to the grouped discrete signal blocks before transmission over the communications channel.

7. The method in claim 1, wherein a length of the time-slot or a packet is variable.

8. The method in claim 1, wherein the processing further comprises:

processing user data units into the frequency domain to generate frequency domain samples;

transforming the frequency domain samples into the time domain to generate the discrete time samples.

9. The method in claim 8, wherein the processing of user data units into the frequency domain includes performing a discrete Fourier transform (DFT) of appropriate length on one or more of the user data units, and

wherein the transforming includes performing an inverse discrete Fourier transform (IDFT) of appropriate length of the frequency domain samples.

10. The method in claim 1, further comprising:

determining that a condition for the communication has changed, and

changing the multiple access technique associated with one or more of the multiple user data units in response to the changed condition.

11. The method in claim 1, further comprising:

associating each multiple user data unit with part or all aspects of its associated multiple access technique in control information to be sent along with each discrete signal block;

or

associating each user data unit with part or all aspects of its associated multiple access technique in control information to be sent over a signaling channel.

12. The method in claim 1, further comprising:

detecting at a receiver a multiple access technique associated with each user data unit,

wherein the receiver employs a wideband or narrowband filter.

13. The method in claim 1 implemented in a network node for communicating with plural access terminals, each access terminal associated with a user, the method further comprising:

at one of the access terminals, processing one or more user data units into discrete samples, assigning the discrete samples to a portion of a communications resource packet, and transmitting the portion to the network node;

wherein other access terminals assign and transmit their respective discrete samples using other portions of the communications resource packet.

14. A communications method, comprising:

receiving over a communications channel a signal containing signals corresponding to multiple user data units each having an associated multiple access technique, where each multiple access technique includes a first part that defines how each of multiple user data units is processed into discrete samples and a second part that defines how processed samples corresponding to each of multiple user data units is allocated in a time-frequency plane;

determining a discrete signal block assignment of the multiple access technique associated with each user data unit;

according to the determined discrete signal block assignment, extracting from the received signal a segment containing the signals corresponding to one or more desired user data units;

sampling the extracted segment to produce a sequence of discrete samples;

if necessary, transforming the discrete samples into frequency domain samples;

extracting from discrete samples in the frequency domain a sample subset containing the discrete samples corresponding to each desired user data unit according to the discrete signal block assignment of the multiple access technique associated with each desired user data unit;

determining the first part of the multiple access technique associated with each user data unit; and

processing the samples associated with each user data unit according to the associated multiple access technique to permit user data corresponding to each user data unit to be extracted.

15. The method in claim 14, wherein the processed blocks in the group correspond to plural users or to the same user.

16. The method in claim 14, wherein the multiple access techniques include one or more of the following:

frequency division multiple access (FDMA) techniques, time division multiple access (TDMA) techniques, and code division multiple access (CDMA) techniques.

17. The method in claim 16, wherein the FDMA techniques include orthogonal frequency division multiplexing (OFDM), orthogonal frequency code division multiplexing (OFCDM), and interleaved-FDMA (IFDMA), and wherein the CDMA techniques include direct sequence (DS)-CDMA and multi-carrier DS-CDMA.

18. The method in claim 14, wherein during the extracting step a cyclic prefix is removed.

19. The method in claim 14, wherein the group of discrete signal blocks corresponds to a time-slot or a packet.

20. The method in claim 14, wherein the transforming of the discrete time samples into frequency domain samples includes performing a discrete Fourier transform (DFT) of appropriate length on a subset of the samples.

21. The method in claim 20, further comprising:

performing an inverse discrete Fourier transform (IDFT) of appropriate length a subset of the frequency domain samples generated by the DFT.

22. The method in claim 14, further comprising:

determining that a condition for the communication has changed, and

registering a change in the multiple access technique associated with one or more of the multiple user data units in response to the changed condition.

23. The method in claim 14, further comprising:

detecting in control information received along with each discrete signal block part or all aspects of the multiple access technique associated with each user data unit, or

detecting in control information transmitted over a signaling channel part or all aspects of the multiple access technique associated with each user data unit.

24. The method in claim 14, further comprising:

blindly detecting part or all aspects of a multiple access technique associated with each user data unit.

25. The method in claim 14, implemented in a radio communications system, further comprising:

wideband filtering the received signal at a radio access stations.

26. The method in claim 14, implemented in a radio communications system, further comprising:

narrowband filtering the received signal at a radio user terminal.

27. Apparatus comprising electronic circuitry configured to:

process each of multiple user data units into discrete samples, user data unit being associated with one of plural different multiple access techniques, where each multiple access technique defines how each of multiple user data units is processed into discrete samples and allocated in a time-frequency plane;

assign the discrete time samples for each user data unit to one or more respective discrete signal blocks; and

group together discrete signal blocks containing discrete samples associated with user data units having different associated multiple access techniques into a time-slot or a packet for transmission over a communications channel.

28. The apparatus in claim 27, wherein the processed user data units in the group correspond to plural users or to the same user.

29. The apparatus in claim 27, wherein the multiple access techniques include one or more of the following:

frequency division multiple access (FDMA) techniques, time division multiple access (TDMA) techniques, and code division multiple access (CDMA) techniques, and wherein the FDMA techniques include orthogonal frequency division multiplexing (OFDM), orthogonal frequency code division multiplexing (OFCDM), and interleaved-FDMA (IFDMA), and wherein the CDMA techniques include direct sequence (DS)-CDMA and multi-carrier DS-CDMA.

30. The apparatus in claim 27, further comprising:

a transmitter for transmitting the grouped discrete signal blocks over the communications channel.

31. The apparatus in claim 27, wherein the electronic circuitry is further configured to add a cyclic prefix to the grouped discrete signal blocks before transmission over the communications channel.

32. The apparatus in claim 27, wherein a length of the time-slot or packet is variable.

33. The apparatus in claim 27, wherein the electronic circuitry is further configured to:

process user data units into the frequency domain to generate frequency domain samples;

transform the frequency domain samples into the time domain to generate the discrete time samples.

34. The apparatus in claim 33, wherein the processing of user data units into the frequency domain includes performing a discrete Fourier transform (DFT) of appropriate length on one or more of the user data units, and

wherein the transforming includes performing an inverse discrete Fourier transform (IDFT) of appropriate length of the frequency domain samples.

35. The apparatus in claim 27, wherein the electronic circuitry is further configured to:

determine that a condition for the communication has changed, and

change the multiple access technique associated with one or more of the multiple user data units in response to the changed condition.

36. The apparatus in claim 27, wherein the electronic circuitry is further configured to:

associate each user data unit with a part or all aspects of its associated multiple access technique in control information to be sent along with each discrete signal block;

or

associate each user data unit with part or all aspects of its associated multiple access technique in control information to be sent over a signaling channel.

37. The apparatus in claim 27, wherein the apparatus includes a first radio network communications node for communicating over a radio interface with plural access terminals.

38. Apparatus for use in an access terminal associated with a user, the access terminal for communicating with a network node along with other access terminals, the apparatus comprising electronic circuitry configured to:

process one or more user data units into discrete samples, each user data unit being associated with one of plural different multiple access techniques, where each multiple access technique defines how multiple users access a common communications resource;

assign the discrete samples for each user data unit to one or more respective discrete signal blocks; and

transmit the one or more discrete signal blocks over a communications channel using a portion of that channel.

39. The apparatus in claim 38, wherein the electronic circuitry is further configured to:

process the one or more user data units into the frequency domain to generate frequency domain samples; and

transform the frequency domain samples into the time domain to generate the discrete time samples.

40. The apparatus in claim 39, wherein the processing of each of the user data units into the frequency domain includes performing a discrete Fourier transform (DFT) of appropriate length on one or more of the user data units, and

wherein the transforming includes performing an inverse discrete Fourier transform (IDFT) of appropriate length of the frequency domain samples.

41. Apparatus comprising electronic circuitry configured to:

receive over a communications channel a signal containing signals corresponding to multiple user data units each having a different associated multiple access technique, where each multiple access technique includes a first part that defines how each of multiple user data units is processed into discrete samples and a second part that defines how processed samples corresponding to each of multiple user data units is allocated in a time-frequency plane;

determine the discrete signal block assignment of the multiple access technique associated with each user data unit;

according to the determined discrete signal block assignment, extract from the received signal a segment containing the signals corresponding to one or more desired user data units;

sample the extracted segment to produce a sequence of discrete samples;

if necessary, transform the discrete samples into frequency domain samples;

extract from discrete samples in the frequency domain a sample subset containing the discrete samples corresponding to each desired user data unit according to the discrete signal block assignment of the multiple access technique associated with each desired user data unit;

determine the first part of the multiple access technique associated with each user data unit; and

process the samples associated with each user data unit according to the associated multiple access technique to permit user data corresponding to each user data unit to be extracted.

42. The apparatus in claim 41, wherein the processed blocks in the group correspond to plural users or to the same user.

43. The apparatus in claim 41, wherein the multiple access techniques include one or more of the following:

frequency division multiple access (FDMA) techniques, time division multiple access (TDMA) techniques, and code division multiple access (CDMA) techniques.

44. The apparatus in claim 41, wherein during the extraction, a cyclic prefix is removed.

45. The apparatus in claim 41, wherein the group of discrete signal blocks corresponds to a time-slot or a packet.

46. The apparatus in claim 41, wherein the transforming of the discrete time samples into frequency domain samples includes performing a discrete Fourier transform (DFT) of appropriate length on a subset of the samples.

47. The apparatus in claim 41, wherein the electronic circuitry is further configured to:

perform an inverse discrete Fourier transform (IDFT) of appropriate length on a subset of the frequency domain samples generated by the DFT.

48. The apparatus in claim 41, wherein the electronic circuitry is further configured to:

detect in control information received along with each discrete signal block part or all aspects of the multiple access technique associated with each user data unit, or

detect in control information transmitted over a signaling channel part or all aspects of the multiple access technique associated with each user data unit.

49. The apparatus in claim 41, wherein the electronic circuitry is further configured to blindly detect part or all aspects of a multiple access technique associated with each user data unit.

50. Apparatus, comprising:

means for processing each of multiple user data units into discrete samples, where each user data unit is associated with one of plural different multiple access techniques, where each multiple access technique defines how each of multiple user data units is processed into discrete samples and allocated in a time-frequency plane;

means for assigning the discrete samples for each user data unit to one or more respective discrete signal blocks;

means for grouping together discrete signal blocks containing multiple user data units having different associated multiple access techniques for transmission over a communications channel,

means for processing user data units into the frequency domain to generate frequency domain samples; and

means for transforming the frequency domain samples into the time domain to generate the discrete time samples,

wherein the means for processing user data units into the frequency domain includes means for performing a discrete Fourier transform (DFT) of appropriate length on one or more of the user data units, and

wherein the means for transforming includes means for performing an inverse discrete Fourier transform (IDFT) of appropriate length of the frequency domain samples.

51. The apparatus in claim 50, further comprising:

means for adding a cyclic prefix to the discrete samples assigned to each discrete signal block.