Radio-Access Method for Mobile-Radio Networks, Related Networks and Computer Program Product

• US 20090252139A1
• Filed: 03/31/2005
• Published: 10/08/2009
• Est. Priority Date: 03/31/2005
• Status: Abandoned Application

• Current Assignee: Telecom Italia S.p.A.
• Original Assignee: Telecom Italia S.p.A.
• Inventors: Ludovico, Michele, Guerrini, Claudio
• Application Number:
  US11/887,635
• Publication Number:
  US 20090252139A1
• Time in Patent Office: Days
• US Class Current: 370/342
• CPC Class Codes: H04W 16/32 Hierarchical cell structures

Abstract

A mobile-radio network includes radio base stations providing radio coverage to the users of the network via antenna elements, wherein the antenna elements are equipped with at least one first communication channel and at least one second communication channel. The first communication channel provides a first layer of individual microcell radio coverage for the antenna elements. The second communication channel is made common to groups of the antenna elements and provides a second layer of virtual macrocell radio coverage, wherein the coverage of each virtual macrocell aggregates the microcell radio coverages of the antenna elements included in the respective group.

Claims

1-43. -43. (canceled)

44. A method of providing radio coverage in a mobile-radio network comprising antenna elements providing radio coverage to users of said network, comprising the steps of:

equipping said antenna elements for communication over at least one first communication channel providing a first layer of individual radio coverage for said antenna elements, and at least one second communication channel; and

making said at least one second communication channel common to at least one group of said antenna elements to provide a second layer of radio coverage aggregating the radio coverages of the antenna elements in said at least one group.

45. The method of claim 44, wherein said at least one group comprises neighbouring antenna elements in said mobile-radio network.

46. The method of claim 44, comprising the steps of:

providing a plurality of said second communication channels; and

making each said second communication channel in said plurality common to a respective group of said antenna elements, whereby said second layer of radio coverage is partitioned in virtual cells each said virtual cell aggregating the radio coverages of the antenna elements in said respective group.

47. The method of claim 46, comprising the steps of:

equipping at least one of said antenna elements with a plurality of said second communication channels; and

causing said at least one of said antenna elements to selectively make said second communication channels in said plurality common to different respective groups of antenna elements.

48. The method of claim 44, comprising the step of selecting different carriers for said at least one first communication channel and said at least one second communication channel.

49. The method of claim 44, comprising the step of selecting the same carrier and different codes for said at least one first communication channel and said at least one second communication channel.

50. The method of claim 49, comprising the steps of:

using, as said different codes, codes for code division multiple access communications comprising a primary code as well as a set of secondary codes associated with said primary code;

using said primary code for said at least one second communication channel; and

using for said at least one first communication channel a secondary code selected out of said secondary codes associated with said primary code.

51. The method of claim 49, comprising the step of using, as said different codes, a set of primary codes for code division multiple access communications.

52. The method of claim 49, comprising the step of using, as said different codes, codes taken from a common tree of orthogonal codes for code division multiple access communications.

53. The method of claim 49, comprising the step of using the same code in said first communication channel for at least two non-neighbouring antenna elements in said at least one group.

54. The method of claim 44, comprising the step of connecting said antenna elements to produce a distributed antenna system.

55. The method of claim 54, comprising the step of connecting said antenna elements in a radio over fibre arrangement.

56. The method of claim 54, comprising the steps of:

connecting at least one radio base station to a plurality of antenna elements;

causing said at least one radio base station to jointly co-operate with a first set of said antenna elements of said plurality to produce an aggregated radio coverage over said first set of antenna elements; and

causing said at least one radio base station to distinctly co-operate with a second set of said antenna elements of said plurality to produce individual radio coverage at each antenna element of said second set.

57. The method of claim 56, wherein said first and second set of said antenna elements at least partly coincide.

58. The method of claim 44, comprising the step of one of said users seeking access to said network being provided access to the network via either of said first layer and said second layer of radio coverage.

59. The method of claim 58, comprising the step of the terminal of one of said users seeking access to said network selecting to access the network via either of said first said layer and said second layer of radio coverage.

60. The method of claim 59, wherein said selecting by said terminal comprises the step of said terminal self-classifying itself as fast-moving or slow-moving, based on a minimum frequency of cell reselection signalled by the network.

61. The method of claim 58, comprising the step of forcing one of said users seeking access to said network to access the network via one of said first layer and said second layer of radio coverage.

62. The method of claim 58, comprising the steps of:

said network assigning a given access bearer to one of said users seeking access to the network; and

providing one of said users access to the network via either of said first layer and said second layer of radio coverage as a function of said access bearer assigned to said user.

63. The method of claim 58, comprising the step of one of said users seeking access to said network being provided access to the network via either of said first layer and said second layer of radio coverage based on different criteria depending on whether the terminal of one of said users:

is in idle mode;

passes from idle mode to connected mode; and

is in connected mode.

64. The method of claim 63, wherein, when said terminal of one of said users passes from idle mode to connected mode, comprising the step of one of said users seeking access to said network being provided access to the network via either of said first layer and said second layer of radio coverage based on a degree of mobility of said terminal inferred by the network.

86. A computer program product, loadable in the memory of at least one computer and comprising software code portions capable of performing the method of claim 44.

65. A mobile-radio network comprising antenna elements providing radio coverage to users of said network, wherein:

said antenna elements are equipped for communication over at least one first communication channel providing a first layer of individual radio coverage for said antenna elements, and at least one second communication channel; and

said at least one second communication channel is common to at least one group of said antenna elements to provide a second layer of radio coverage aggregating the radio coverage of the antenna elements in said at least one group.

66. The network of claim 65, wherein said at least one group comprises neighbouring antenna elements in said mobile-radio network.

67. The network of claim 65, comprising a plurality of said second communication channels, each of said second communication channels in said plurality being common to a respective group of said antenna elements, whereby said second layer of radio coverage is partitioned in virtual cells, each of said virtual cells aggregating the radio coverage of the antenna elements in said respective group.

68. The network of claim 67, wherein at least one of said antenna elements is equipped for communication over a plurality of said second communication channels, whereby said at least one of said antenna elements is configured for selectively making said second communication channels in said plurality common to different respective groups of antenna elements.

69. The network of claim 65, wherein said at least one first communication channel and said at least one second communication channel use different carriers.

70. The network of claim 65, wherein said at least one first communication channel and said at least one second communication channel use the same carrier and different codes.

71. The network of claim 70, wherein:

said different codes are codes for code division multiple access communications comprising a primary code as well as a set of secondary codes associated with said primary code;

said at least one second communication channel uses said primary code; and

said at least one first communication channel uses a secondary code selected out of said secondary codes associated with said primary code.

72. The network of claim 70, wherein said different codes are a set of primary codes for code division multiple access communications.

73. The network of claim 70, wherein said different codes are codes taken from a common tree of orthogonal codes for code division multiple access communications.

74. The network of claim 70, wherein at least two non-neighbouring antenna elements in said at least one group use the same code for said first communication channel.

75. The network of claim 65, wherein said antenna elements are connected to produce a distributed antenna system.

76. The network of claim 75, wherein said antenna elements are connected in a radio over fibre arrangement.

77. The network of claim 75, wherein:

at least one of said radio base stations is connected to a plurality of antenna elements;

said at least one radio base station jointly co-operates with a first set of said antenna elements of said plurality to produce an aggregated radio coverage over said first set of antenna elements; and

said at least one radio base station distinctly co-operates with a second set of said antenna elements of said plurality to produce individual radio coverages at each antenna element of said second set.

78. The network of claim 77, wherein said first and second set of said antenna elements at least partly coincide.

79. The network of claim 65, wherein said network is configured for providing to one of said users seeking access to said network access to the network via either of said first layer and said second layer of radio coverage.

80. The network of claim 79, comprising the terminal of one of said users seeking access to said network being configured to select to access the network via either of said first layer and second layer of radio coverage.

81. The network of claim 80, wherein said terminal is configured for self-classifying itself as fast-moving or slow-moving, based on a minimum frequency of cell reselection signaled by the network.

82. The network of claim 79, wherein said network is configured for forcing one of said users seeking access to said network to access the network via one of said first layer and said second layer of radio coverage.

83. The network of claim 79, wherein said network is configured for:

assigning to one of said users seeking access to the network a given access bearer; and

providing said one of said users access to the network via either of said first layer and said second layer of radio coverage as a function of said access bearer assigned to said user.

84. The network of claim 79, wherein said network is configured for providing to one of said users seeking access to said network, access to the network via either of said first layer and said second layer of radio coverage based on different criteria depending on whether the terminal of said one of said users:

is in idle mode;

passes from idle mode to connected mode; and

is in connected mode.

85. The network of claim 84, wherein said network is configured for providing, when said terminal of said one of said users passes from idle mode to connected mode, access to the network to said one of said users seeking access to said network via either of said first layer and said second layer of radio coverage based on a degree of mobility of said terminal inferred by the network.