Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels

• US 6,842,440 B2
• Filed: 04/25/2002
• Issued: 01/11/2005
• Est. Priority Date: 03/20/1985
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Handzel, Mark J., Paneth, Eric, Morley, Steven Allan, Avis, Graham M.
• Primary Examiner(s): VANDERPUYE, KENNETH N
• Application Number:
  US10/132,670
• Publication Number:
  US 20030142646A1
• Time in Patent Office: 992 Days
• Field of Search: 370/347, 370/357, 370/348, 370/341, 370/478, 370/330
• US Class Current: 370/330
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0865 Independent weighting, i.e. weights based on own antenna reception parameters
• CPC Class Codes: H04J 3/0647 Synchronisation among TDM nodes
• CPC Class Codes: H04J 3/0682 by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0084 Formats for payload data
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1642 Formats specially adapted for sequence numbers
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/14 : using intermediate storage
• CPC Class Codes: H04W 28/24 : Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
• CPC Class Codes: H04W 28/26 : Resource reservation
• CPC Class Codes: H04W 36/12 : Reselecting a serving backbone network switching or routing node
• CPC Class Codes: H04W 4/18 : Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 40/02 : Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 52/0216 : using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/20 : using error rate
• CPC Class Codes: H04W 56/00 : Synchronisation arrangements
• CPC Class Codes: H04W 72/02 : Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 72/044 : based on the type of the allocated resource
• CPC Class Codes: H04W 72/0446 : Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 : Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/12 : Wireless traffic scheduling
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/04 : Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 76/10 : Connection setup
• CPC Class Codes: H04W 84/00 : Network topologies
• CPC Class Codes: H04W 84/14 : WLL [Wireless Local Loop]; RLL [Radio Local Loop]
• CPC Class Codes: H04W 88/08 : Access point devices
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

A system and method for wireless communication between a plurality of subscriber units and a base station, the base station communicating information signals from an originating source to a destination subscriber unit over a channel at an assigned one of a plurality of frequencies using repetitive time frames, each said time frame comprising a sequence of time slots. The channel is defined as having the same one or more time slots from the sequence of time slots in one or more of the time frames. The base station includes a central processing unit capable of assigning a duration of time for the information signals being sent to the destination subscriber unit. The duration equals the duration of one or more time slots in the same frame. The central processing unit maintains a memory of which time slots of each time frame have been assigned and provides the time slot assignment, and therefore channel assignment, by consulting said memory. The system includes a multiplexer for multiplexing the information signals onto the assigned channel; and a transmitter for transmitting the information signals to the destination subscriber unit using the assigned channel.

Claims

1. A base station for wireless communication with a plurality of subscriber units, the base station communicating information signals from an originating source to a destination one of said subscriber units over a channel at an assigned one of a plurality of frequencies using repetitive time frames, each said time frame comprising a sequence of time slots, said channel being defined as having the same one or more of said time slots from said sequence of time slots in one or more of said time frames, said base station comprising:

a central processing unit for assigning a duration of time for the information signals being sent to said destination subscriber unit, wherein said duration equals the duration of one or more time slots in the same frame, said central processing unit maintaining a memory of which time slots of each time frame have been assigned and providing said time slot assignment, and therefore said channel assignment, by consulting said memory;

a multiplexer for multiplexing the information signals onto the assigned channel; and

a transmitter for transmitting the information signals to said destination subscriber unit using the assigned channel.

2. A base station as in claim 1, wherein within the same time frame other information signals from other originating sources are assigned time slots other than said time slots.

3. A base station as in claim 1, wherein said information signals comprise data information.

4. A base station as in claim 2, wherein other information signals comprise voice information.

5. A base station as in claim 1, wherein said information signals have a coding rate, and wherein different information signals may have different respective coding rates.

6. A base station as in claim 1, wherein said central processing unit is for assigning information signals having respective different coding rates to slots within the same time frame.

7. A base station as in claim 1, wherein said information signals are modulated onto one of said plurality of frequencies, and wherein different information signals may have different modulation types.

8. A base station as in claim 1, wherein said base station comprises a modulator for modulating the information signals onto the carrier frequency of the channel, said modulator for modulating different information signals having respective different modulation types, said central processing unit assigning information signals having respective different modulation types to slots in the same time frame.

9. A base station as in claim 8, wherein a first modulation type comprises PSK modulation.

10. A base station as in claim 1, wherein said base station further comprises a linear modulator including a linear amplifier.

11. A base station as in claim 8, wherein said modulator uses modulation to transmit at least 2 bits/symbol.

12. A base station as in claim 1 further comprising a receiver for receiving reverse information signals from an originating one of said subscriber units to a destination over a reverse channel at an assigned frequency, said reverse information signal being present on at least one time slot within the same time frame.

13. A base station as in claim 1, wherein at least one of said subscriber units is a mobile subscriber unit.

14. A base station for wireless communication with a plurality of subscriber units, the base station communicating information signals to subscriber units in selected time slots of time frames of assigned frequencies wherein the time frames for each frequency have a predetermined number of time slots each having a predetermined position in the time frame and time division multiplex (TDM) channels are defined by one or more time slots having the same relative position in each of a frequency'"'"'s time frames, said base station comprising:

a central processing unit which makes time slot assignments for segments of each information signal being sent to a subscriber unit, such that segments of a particular information signal are assigned to the time slots of a selected TDM channel;

said central processing unit maintaining a memory of which time slot positions in the time frames of each frequency are allocated to which TDM channels and providing said assignment by consulting said memory;

a multiplexer for multiplexing information signal segments into series corresponding to time slot assignments; and

a transmitter for transmitting the multiplexed information signal segments to subscriber units on frequencies corresponding to the time slot assignments.

15. A base station according to claim 14 wherein at least one frequency has N time slots per time frame where N is at least 4 and N TDM channels are assigned for that frequency such that an ith TDM channel corresponds to the time slots of an ith time slot position of the frequency'"'"'s time frames, for i=1 to N, and the central processing unit assigns a series of segments, which series combine to constitute a given information signal, to the ith time slot of consecutive time frames of the frequency in order to communicate the given information signal to a subscriber unit via the ith TDM channel of the frequency.

16. A base station according to claim 14 further comprising an information signal buffer unit associated with said multiplexer that provides information signals in segments of a selected size to the multiplexer corresponding to time slot assignments.

17. A base station according to claim 14 wherein the central processing unit assigns segments of information signals intended for different subscriber units in different time slots of the same TDM channel.

18. A base station according to claim 14 wherein the central processing unit assigns time slots of consecutive time frames for each segment of a given information signal.

19. A base station according to claim 14 further comprising a receiver for receiving signals on reception frequencies wherein each frequency used for transmission has an associated frequency used for reception such that received signals on each respective reception frequency have time frames having the same predetermined number of time slots as transmitted signals on the associated transmission frequency.

20. A base station according to claim 19 wherein each frequency used for transmission is different from its associated frequency used for reception and is separated therefrom by about 5MHz.

21. A base station according to claim 14 for communicating voice information signals further comprising a voice coder unit for compressing a voice information signal into a compressed voice information signal wherein said central processing unit makes time slot assignments for segments of compressed voice information signals output by said voice coder unit.

22. A base station according to claim 14 for communicating command information signals wherein said central processing unit makes time slot assignments for segments of command information signals to a TDM channel designated as a Radio Control Channel for command information signals for all subscriber units.

23. A base station according to claim 14 wherein said central processing unit allocates and deallocates time slot positions of frequency time frames by consulting said memory to dynamically define TDM channels.

24. A base station according to claim 23 wherein at least one frequency has time frames which each have four time slots and wherein said central processing unit allocates either one or two time slots per time frame for the frequency'"'"'s TDM channels such that the central processor allocates for the frequency a maximum of four TDM channels, each corresponding to the time slots of a respective first, second, third or fourth time slot position of each of the frequency'"'"'s time frame and a minimum of two TDM channels, one corresponding to the time slots of first and second time slot positions of the frequency'"'"'s time frames and the other corresponding to the time slots of third and fourth time slot positions of the frequency'"'"'s time frames.

25. A base station for wireless communication with a plurality of subscriber units, the base station communicating information signals to subscriber units in selected time slots of time frames of assigned frequencies wherein the time frames for each frequency have a predetermined number of time slots, each time slot having a predetermined position in the time frame, and channels are defined by a group of time slots having the same relative position in each of a frequency'"'"'s time frames, said base station comprising:

a central processing unit which makes time slot assignments for segments of each information signal being sent to a subscriber unit, such that segments of a particular information signal are assigned to the time slots of a selected channel;

said central processing unit maintaining a memory of which time slot positions in the time frames of each frequency are allocated to which channels and providing said assignment by consulting said memory;

a multiplexer for multiplexing information signal segments into series corresponding to time slot assignments; and

a transmitter for transmitting the multiplexed information signal segments to subscriber units on frequencies corresponding to the time slot assignments.

26. A base station for wireless communication with a plurality of subscriber units, the base station communicating information signals from an originating source to a destination one of said subscriber units over a channel at an assigned one of a plurality of frequencies, said channel comprising a plurality of repetitive time slots, with a series of consecutive time slots defining a time frame, said base station comprising:

a central processing unit for assigning at least one time slot in the same time frame for the information signals being sent to said destination subscriber unit, said central processing unit maintaining a memory of which time slots have been assigned and providing said time slot assignment by consulting said memory;

a multiplexer for multiplexing the information signals in accordance with said time slot assignment; and

a transmitter for transmitting the information signals to said destination subscriber unit using the assigned time slots within the time frame.

27. A base station as in claim 26, wherein within the same time frame other information signals from other originating sources are assigned time slots other than said time slots.

28. A base station as in claim 26, wherein said information signals comprise data information.

29. A base station as in claim 27, wherein other information signals comprise voice information.

30. A base station as in claim 26, wherein said information signals have a coding rate, and wherein different information signals may have different respective coding rates.

31. A base station as in claim 26, wherein said central processing unit is for assigning information signals having respective different coding rates to slots within the same time frame.

32. A base station as in claim 26, wherein said information signals are modulated onto one of said plurality of frequencies, and wherein different information signals may have different modulation types.

33. A base station as in claim 26, wherein said base station comprises a modulator for modulating the information signals onto the carrier frequency of the channel, said modulator for modulating different information signals having respective different modulation types, said central processing unit assigning information signals having respective different modulation types to slots in the same time frame.

34. A base station as in claim 33, wherein a first modulation type comprises PSK modulation.

35. A base station as in claim 26, wherein said base station further comprises a linear modulator including a linear amplifier.

36. A base station as in claim 33, wherein said modulator uses modulation to transmit at least 2 bits/symbol.

37. A base station as in claim 26 further comprising a receiver for receiving reverse information signals from an originating one of said subscriber units to a destination over a reverse channel at an assigned frequency, said reverse information signal being present on at least one time slot within the same time frame.

38. A base station as in claim 26, wherein at least one of said subscriber units is a mobile subscriber unit.

39. A base station for wireless communication with a plurality of subscriber units, the base station communicating information signals from an originating source to a destination one of said subscriber units over a channel at an assigned one of a plurality of frequencies, said channel comprising at least one time slot from a time frame repeating over time, each said time frame comprising a finite series of time slots, said base station comprising:

a central processing unit for defining a channel by assigning a duration of time for each of the information signals being sent to said destination subscriber unit, wherein said duration equals the duration of one or more time slots in the same time frame, said central processing unit maintaining a memory of which time slots in each time frame have been assigned and providing said time slot assignment by consulting said memory;

a multiplexer for multiplexing the information signals onto the channel; and

a transmitter for transmitting the information signals to said destination subscriber unit over the channel.

40. A base station as in claim 39, wherein within the same time frame other information signals from other originating sources are assigned time slots other than said time slots.

41. A base station as in claim 39, wherein said information signals comprise data information.

42. A base station as in claim 40, wherein other information signals comprise voice information.

43. A base station as in claim 39, wherein said information signals have a coding rate, and wherein different information signals may have different respective coding rates.

44. A base station as in claim 39, wherein said central processing unit is for assigning information signals having respective different coding rates to slots within the same time frame.

45. A base station as in claim 39, wherein said information signals are modulated onto one of said plurality of frequencies, and wherein different information signals may have different modulation types.

46. A base station as in claim 39, wherein said base station comprises a modulator for modulating the information signals onto the carrier frequency of the channel, said modulator for modulating different information signals having respective different modulation types, said central processing unit assigning information signals having respective different modulation types to slots in the same time frame.

47. A base station as in claim 46, wherein a first modulation type comprises PSK modulation.

48. A base station as in claim 39, wherein said base station further comprises a linear modulator including a linear amplifier.

49. A base station as in claim 46, wherein said modulator uses modulation to transmit at least 2 bits/symbol.

50. A base station as in claim 39 further comprising a receiver for receiving reverse information signals from an originating one of said subscriber units to a destination over a reverse channel at an assigned frequency, said reverse information signal being present on multiple time slot within the same time frame.

51. A base station as in claim 39, wherein at least one of said subscriber units is a mobile subscriber unit.

52. A base station for wireless communication with a plurality of subscriber units, the base station communicating information signals from an originating source to a destination one of said subscriber units at an assigned one of a plurality of frequencies and over an assigned channel, using a repeating time frame, said time frame having a plurality of time slots, said channel being defined by at least one of said time slots in each time frame, said base station comprising:

a central processing unit for assigning a duration of time for the information signals being sent to said one destination subscriber unit, wherein said duration equals the duration of one or more time slots in the same time frame, said central processing unit maintaining a memory of which time slots in each time frame have been assigned and providing said time slot assignment, and therefore said channel assignment, by consulting said memory;

a multiplexer for multiplexing the information signals onto the assigned channel; and

a transmitter for transmitting the information signals to said destination subscriber unit using the assigned channel.

53. A base station as in claim 52, wherein within the same time frame other information signals from other originating sources are assigned time slots other than said time slots.

54. A base station as in claim 52, wherein said information signals comprise data information.

55. A base station as in claim 53, wherein other information signals comprise voice information.

56. A base station as in claim 52, wherein said information signals have a coding rate, and wherein different information signals may have different respective coding rates.

57. A base station as in claim 52, wherein said central processing unit is for assigning information signals having respective different coding rates to slots within the same time frame.

58. A base station as in claim 52, wherein said information signals are modulated onto one of said plurality of frequencies, and wherein different information signals may have different modulation types.

59. A base station as in claim 52, wherein said base station comprises a modulator for modulating the information signals onto the carrier frequency of the channel, said modulator for modulating different information signals having respective different modulation types, said central processing unit assigning information signals having respective different modulation types to slots in the same time frame.

60. A base station as in claim 59, wherein a first modulation type comprises PSK modulation.

61. A base station as in claim 52, wherein said base station further comprises a linear modulator including a linear amplifier.

62. A base station as in claim 59, wherein said modulator uses modulation to transmit at least 2 bits/symbol.

63. A base station as in claim 52 further comprising a receiver for receiving reverse information signals from an originating one of said subscriber units to a destination over a reverse channel at an assigned frequency, said reverse information signal being present on at least one time slot within the same time frame.

64. A base station as in claim 52, wherein at least one of said subscriber units is a mobile subscriber unit.

65. A base station for wireless communication with a plurality of subscriber units, the base station communicating information signals from an originating source to a destination one of said subscriber units over a channel at an assigned one of a plurality of frequencies, using a repeating time frame, each time frame having a plurality of time slots, said channel being defined by at least one repetitive time slot from a plurality of time frames, said base station comprising:

a central processing unit for assigning channels by assigning a duration of time for the information signals being sent to said destination subscriber unit, wherein said duration equals the duration of one or more time slots in the same time frame, said central processing unit maintaining a memory of which time slots in each time frame have been assigned and providing said time slot assignment by consulting said memory;

a multiplexer for multiplexing the information signals onto the assigned channels; and

a transmitter for transmitting the information signals to said destination subscriber unit using the assigned channels.

66. A base station as in claim 65, wherein within the same time frame other information signals from other originating sources are assigned time slots other than said time slots.

67. A base station as in claim 65, wherein said information signals comprise data information.

68. A base station as in claim 66, wherein other information signals comprise voice information.

69. A base station as in claim 65, wherein said information signals have a coding rate, and wherein different information signals may have different respective coding rates.

70. A base station as in claim 65, wherein said central processing unit is for assigning information signals having respective different coding rates to slots within the same time frame.

71. A base station as in claim 65, wherein said information signals are modulated onto one of said plurality of frequencies, and wherein different information signals may have different modulation types.

72. A base station as in claim 65, wherein said base station comprises a modulator for modulating the information signals onto the carrier frequency of the channel, said modulator for modulating different information signals having respective different modulation types, said central processing unit assigning information signals having respective different modulation types to slots in the same time frame.

73. A base station as in claim 72, wherein a first modulation type comprises PSK modulation.

74. A base station as in claim 65, wherein said base station further comprises a linear modulator including a linear amplifier.

75. A base station as in claim 72, wherein said modulator uses modulation to transmit at least 2 bits/symbol.

76. A base station as in claim 65 further comprising a receiver for receiving reverse information signals from an originating one of said subscriber units to a destination over a reverse channel at an assigned frequency, said reverse information signals being present on multiple time slots within the same frame.

77. A base station as in claim 65, wherein at least one of said subscriber units is a mobile subscriber unit.

78. A method for facilitating wireless communication between an origination and a destination communicating unit over a channel at an assigned one of a plurality of frequencies using repetitive time frames, each said time frame comprising a sequence of time slots, said channel being defined as having the same one or more of said time slots from said sequence of time slots in one or more of said time frames, the method comprising:

assigning a duration of time for the information signals being sent, wherein said duration equals the duration of one or more time slots in the same frame;

maintaining a memory of which time slots of each time frame have been assigned;

providing said time slot assignment, and therefore said channel assignment, by consulting said memory;

multiplexing the information signals onto the assigned channel; and

transmitting the information signals to said destination communicating unit using the assigned channel.

79. The method of claim 78, wherein within the same time frame other information signals are assigned time slots other than said time slots.

80. The method of claim 78, wherein said information signals comprise data information.

81. The method of claim 79, wherein said other information signals comprise voice information.

82. The method of claim 79, wherein said information signals have a coding rate, and wherein said other information signals may have different respective coding rates.

83. The method of claim 78, further comprising assigning information signals having respective different coding rates to slots within the same time frame.

84. The method of claim 79, further comprising modulating said information signals onto one of said plurality of frequencies, and wherein said other information signals may have different modulation types.

85. The method of claim 78, further including modulating the information signals onto the carrier frequency of the channel, said modulating step for modulating different information signals having respective different modulation types;

and whereby said assigning step assigns information signals having respective different modulation types to slots in the same time frame.

86. The method of claim 85, wherein at least one of said modulation types comprises PSK modulation.

87. The method of claim 78, whereby said modulation step includes modulation to transmit at least 2 bits/symbol.

88. The method of claim 78, further comprising receiving reverse information signals from said communicating unit over a reverse channel at an assigned frequency, said reverse information signal being present on multiple time slots within the same time frame.