Spatial multiplexing in a cellular network

• US 6,067,290 A
• Filed: 07/30/1999
• Issued: 05/23/2000
• Est. Priority Date: 07/30/1999
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Gigabit Wireless Incorporated
• Inventors: Gesbert, David J., Heath, Robert W. Jr., Paulraj, Arogyaswami J., Sebastian, Peroor K.
• Primary Examiner(s): Pham, Chi H.
• Assistant Examiner(s): Pham, Brenda H.
• Application Number:
  US09/364,146
• Time in Patent Office: 298 Days
• Field of Search: 370/328, 370/329, 370/347, 370/341, 370/342, 370/326, 370/319, 370/431, 370/464, 370/310, 455/13.1, 455/507, 455/509, 455/524, 455/560, 375/299
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/2612 Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity H04B7/2615 - H04B7/2643 take precedence; provision for broadband connection H04Q11/0478
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 16/12 Fixed resource partitioning
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 28/12 using signalling between network elements
• CPC Class Codes: H04W 36/00 Hand-off or reselection arrangements
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

The present invention provides methods and apparatus for implementing spatial multiplexing in conjunction with the one or more multiple access protocols during the broadcast of information in a wireless network. A wireless cellular network for transmitting subscriber datastream(s) to corresponding ones among a plurality of subscriber units located within the cellular network is disclosed. The wireless cellular network includes base stations and a logic. The base stations each include spatially separate transmitters for transmitting, in response to control signals, selected substreams of each subscriber datastream on an assigned channel of a multiple access protocol. The logic communicates with each of the base stations. The logic assigns an available channel on which to transmit each subscriber datastream. The logic routes at least a substream of each datastream to at least a selected one of the base stations. The logic also generates control signals to configure the at least a selected one of the base stations to transmit the selected substreams to a corresponding one among the plurality of subscriber units on the assigned channel. A subscriber unit for use in a cellular system is also disclosed. The subscriber unit includes: spatially separate receivers, a spatial processor, and a combiner. The spatially separate receivers receive the assigned channel composite signals resulting from the spatially separate transmission of the subscriber downlink datastream(s). The spatial processor is configurable in response to a control signal transmitted by the base station to separate the composite signals into estimated substreams based on information obtained during the transmission of known data patterns from at least one of the base stations. The spatial processor signals the base stations when a change of a spatial transmission configuration is required. The combiner combines the estimated substreams into a corresponding subscriber datastream.

Claims

1. A wireless cellular network for transmitting subscriber datastreams to corresponding ones among a plurality of subscriber units located within the cellular network, and said wireless cellular network comprising:

base stations each including spatially separate transmitters for transmitting in response to control signals, selected substreams of each subscriber datastream on an assigned channel of a multiple access protocol; and

logic communicating with each of the base stations and the logic for assigning an available channel on which to transmit each subscriber datastream, for routing at least a substream of each datastream to at least a selected one of the base stations and for generating control signals to configure the at least a selected one of the base stations to transmit the selected substreams to a corresponding one among the plurality of subscriber units on the assigned channel.

2. The wireless cellular network of claim 1, wherein the multiple access protocol is selected from at least one of a group of multiple access protocols consisting of:

code-division multiple access, frequency-division multiple access, time-division multiple access, space-division multiple access, orthogonal frequency division multiple access (OFDMA), wavelength division multiple access (WDMA), wavelet division multiple access, orthogonal division multiple access (ODMA) and quasi-orthogonal division multiple access (ODMA) techniques.

3. The wireless cellular network of claim 1, wherein the assigned channel comprises, within a transmission bandwidth, at least one of:

a frequency-division, a time-division, a spatial-division, a code-division, orthogonal frequency division multiple access (OFDMA), wavelength division multiple access (WDMA), wavelet division multiple access or any other orthogonal division multiple access (ODMA)/quasi-orthogonal division multiple access techniques.

4. The wireless cellular network of claim 1, wherein the logic further communicates with at least one of a group of networks for delivering the subscriber datastreams, and the group of networks consisting of:

a public switched telephone network, public land mobile network, a local area network, a wide area network, a satellite network, an adhoc network, a virtual private network, an intranet and an internet.

5. The wireless cellular network of claim 1, wherein the base stations are fixed.

6. The wireless cellular network of claim 1, wherein the base stations are mobile.

7. The wireless cellular network of claim 1, wherein the base stations include satellites.

8. The logic of claim 1, further for changing a spatial transmission configuration from a first transmitting base station to at least the first base station together with a second transmitting base station responsive to a determination that a change of a spatial reception configuration is required in order to resolve the selected substreams at the corresponding one among the plurality of subscriber units.

9. The logic of claim 1, further for changing the spatial reception configuration from a first receiving base station to at least a second base station together with a third base station responsive to a determination that a change of a spatial reception configuration is required in order to resolve the selected substreams at the corresponding one among the plurality of subscriber units.

10. The wireless cellular network of claim 1, wherein the logic further comprises:

a parser for parsing each datastream into substreams.

11. The wireless cellular network of claim 10, wherein the parser includes responsiveness to a mode signal to parse each datastream into a variable number of substreams and to avoid parsing of each datastream.

12. The wireless cellular network of claim 10, wherein the parser includes responsiveness to a modulation rate of each substream.

13. The wireless cellular network of claim 1, wherein the logic further comprises:

a parser for parsing each datastream into substreams; and

a router for routing the substreams to at least a selected one of the base stations.

14. The wireless cellular network of claim 13, wherein each of the base stations further comprises:

a selector responsive to the control signals generated by the logic to inject a routed one of the substreams onto the channel assigned by the logic.

15. The wireless cellular network of claim 13, wherein each of the base stations further comprises:

a selector responsive to the control signals generated by the logic to inject routed ones of the substreams onto both the channel assigned by the logic as well as onto selected ones of the spatially separate transmitters.

16. The wireless cellular network of claim 1, wherein the logic further comprises:

a detector to detect modes of the subscriber datastreams from the first network and to generate a mode signal corresponding to the mode of each of the subscriber datastreams;

a parser responsive to the mode signal to parse the datastream into a variable number of substreams and to avoid parsing of the datastream; and

a router for routing both an unparsed datastream as well as a variable number of substreams to at least a selected one of the base stations.

17. The wireless cellular network of claim 16, wherein the modes of the datastreams include voice mode and data mode and wherein further the parser responsive to a voice mode signal avoids parsing of the datastream, and responsive to a data mode signal parses the datastream into a variable number of substreams.

18. The wireless cellular network of claim 16, wherein the modes of the datastreams include high bit rate and low bit rate and wherein further the parser avoids parsing of a low bit rate datastream, and parses a high bit rate datastream into a variable number of substreams.

19. The wireless cellular network of claim 16, wherein the modes of the datastreams include low QoS requirement and high QoS requirement and wherein further the parser avoids parsing a datastream with a low QoS requirement, and parses a datastream with a high QoS requirement into a variable number of substreams.

20. The wireless cellular network of claim 16, wherein each of the base stations further comprises:

a selector responsive to the control signals generated by the logic to inject routed ones of the variable number of substreams as well as the unparsed datastream onto the channel assigned by the logic.

21. The wireless cellular network of claim 16, wherein each of the base stations further comprises:

a selector responsive to the control signals generated by the logic to inject routed ones of the substreams as well as the unparsed datastream onto both the channel assigned by the logic as well as a selected one of the spatially separate transmitters.

22. The wireless cellular network of claim 1,

wherein the logic further comprises:

a router for routing each of the subscriber datastreams to at least a selected one of the base stations; and

wherein each of the base stations further comprises;

a parser for receiving the subscriber datastream and for parsing the subscriber datastream into the selected substreams.

23. The wireless cellular network of claim 22, wherein the parser includes responsiveness to the control signals generated by the logic to parse the datastream into a variable number of substreams.

24. The wireless cellular network of claim 22, wherein each of the base stations further comprises:

a selector communicating with the parser and the selector responsive to the control signals generated by the logic to inject the selected substreams onto the channel assigned by the logic.

25. The wireless cellular network of claim 22, wherein each of the base stations further comprises:

a selector communicating with the parser and the selector responsive to the control signals generated by the logic to inject the selected substreams onto both the channel assigned by the logic as well as a selected one of the spatially separate transmitters.

26. The wireless cellular network of claim 1,

wherein the logic further comprises:

a detector to detect modes of the subscriber and to generate a mode signal corresponding to the mode of each of the subscriber datastreams;

a router for routing to at least a selected one of the base stations each of the subscriber datastreams; and

wherein each of the base stations further comprises;

a parser for receiving the subscriber datastream and responsive to the mode signal to parse the datastream into a variable number of substreams and to avoid parsing of the datastream.

27. The wireless cellular network of claim 26, wherein the modes of the datastreams include voice mode and data mode, and wherein further the parser responsive to a voice mode signal avoids parsing of the datastream, and responsive to a data mode signal parses the datastream into a variable number of substreams.

28. The wireless cellular network of claim 26, wherein the modes of the datastreams include high baud rate and low baud rate and wherein further the parser responsive to a low baud rate signal avoids parsing of the datastream, and responsive to a high baud rate signal parses the datastream into a variable number of substreams.

29. The wireless cellular network of claim 26, wherein each of the base stations further comprises:

a selector communicating with the parser and the selector responsive to the control signals generated by the logic to inject one of the unparsed datastream and the variable number of substreams onto the channel assigned by the logic.

30. The wireless cellular network of claim 26, wherein each of the base stations further comprises:

a selector responsive to the control signals generated by the logic to inject one of the unparsed datastream and the variable number of substreams onto both the channel assigned by the logic as well as a selected one of the spatially separate transmitters.

31. The wireless cellular network of claim 1, wherein each of the base stations further comprises:

a training module for injecting a training sequence into the transmissions of the spatially separable transmitters.

32. The wireless cellular network of claim 31, wherein the training module further comprises:

a logic for varying at least one of;

a duration of the training sequence and a frequency of the training sequence.

33. The wireless cellular network of claim 31, wherein the training module further comprises:

a logic for selecting a training sequence.

34. The wireless cellular network of claim 1, wherein each of the base stations further comprises:

spatially separate receivers for receiving composite signals resulting from the spatially separate transmission of spatially separate source signals corresponding to selected substreams of an uplink subscriber datastream from selected ones of the subscriber units, on an assigned channel of the multiple access protocol;

a spatial processor configurable in response to the control signal to separate the composite signals into estimated source signals based on information obtained during the transmission of known data patterns from the selected ones of the subscriber units; and

a combiner for combining the estimated source signals into a corresponding uplink subscriber datastream.

35. The wireless cellular network of claim 34, wherein the spatial processor further comprises:

a configurable logic responsive to the control signal to vary both a number of the composite signals separated as well as the number of the estimated source signals.

36. The wireless cellular network of claim 35, wherein the configurable logic further comprises:

logic for evaluating the composite signals over time.

37. The wireless cellular network of claim 1, wherein each of the base stations further comprise:

mobility detectors for determining a mobility of each of the subscriber units and generating a mobility signal; and

a training module responsive to the mobility signal for varying at least one of;

an injection interval and duration of a training sequence into the transmissions of the spatially separable transmitters.

38. The wireless cellular network of claim 1, wherein each of the base stations further comprises:

transmit processes selected from at least one of a group of transmit processes consisting of;

diversity, space coding, space time coding and beam forming.

39. A wireless cellular network for transmitting subscriber downlink datastreams from a first network to subscribers located within the wireless cellular network, and said wireless cellular network comprising:

base stations each configured for spatially separate transmission of selected substreams of each subscriber downlink datastream on an assigned channel of a multiple access protocol;

subscriber units each configured for spatially separate reception on the assigned channel of the selected substreams and for combining the substreams into the corresponding subscriber datastream; and

a logic communicating with each of the base stations and to the first network and the logic configured to route at least a substream of each subscriber downlink datastream to at least a selected one of the base stations and further configured to vary the routing between a single base station and multiple base stations to vary a spatial transmission configuration of the selected substreams.

40. A wireless cellular network for receiving subscriber datastreams at corresponding ones among a plurality of base stations located within the cellular network, and said wireless cellular network comprising:

a plurality of subscriber units each including spatially separate transmitters for transmitting, in response to control signals, selected substreams of each subscriber datastream on an assigned channel of a multiple access protocol; and

logic communicating with each of the base stations and the logic for generating control signals to configure selected ones of the base stations to receive composite signals resulting from the spatially separate transmission of the selected substreams from a corresponding one among the plurality of subscriber units on the assigned channel, for converting the composite signals into estimate substreams and for combining the estimated substreams of each subscriber datastream into each subscriber datastream.

41. The logic of claim 40, further for changing the spatial reception configuration from a first receiving base station to at least the first base station together with a second base station responsive to a determination that a change of a spatial reception configuration is required in order to resolve the composite signals into estimated substreams.

42. The logic of claim 40, further for changing the spatial reception configuration from a first receiving base station to at least a second base station together with a third base station responsive to a determination that a change of a spatial reception configuration is required in order to resolve the composite signals into estimated substreams.

43. A wireless cellular network for transmitting subscriber datastreams to corresponding ones among a plurality of subscriber units located within the cellular network, and said wireless cellular network comprising:

base stations each including at least one transmitter for transmitting, in response to control signals, selected substreams of each subscriber datastream on an assigned channel of a multiple access protocol; and

logic communicating with each of the base stations and the logic for assigning an available channel on which to transmit each subscriber datastream, for routing at least a substream of each datastream to at least a selected one of the base stations and for generating control signals to configure the at least a selected one of the base stations to transmit the selected substreams to a corresponding one among the plurality of subscriber units on the assigned channel.

44. The logic of claim 43, further for changing a spatial transmission configuration from a first transmitting base station to at least the first base station together with a second transmitting base station responsive to a determination that a change of a spatial reception configuration is required in order to resolve the selected substreams at the corresponding one among the plurality of subscriber units.

45. The logic of claim 43, further for changing the spatial reception configuration from a first receiving base station to at least a second base station together with a third base station responsive to a determination that a change of a spatial reception configuration is required in order to resolve the selected substreams at the corresponding one among the plurality of subscriber units.

46. The logic of claim 43, further for changing a spatial transmission configuration from a first transmitting base station together with a second transmitting base station to at least the first transmitting base station together with a third transmitting base station responsive to a determination that a change of a spatial reception configuration is required in order to resolve the selected substreams at the corresponding one among the plurality of subscriber units.

47. The logic of claim 43, further for changing a spatial transmission configuration from a first transmitting base station together with a second transmitting base station to at least the third transmitting base station together with a fourth transmitting base station responsive to a determination that a change of a spatial reception configuration is required in order to resolve the selected substreams at the corresponding one among the plurality of subscriber units.