Systems and methods for exploiting inter-cell multiplexing gain in wireless cellular systems via distributed input distributed output technology

• US 9,923,657 B2
• Filed: 03/12/2013
• Issued: 03/20/2018
• Est. Priority Date: 03/12/2013
• Status: Active Grant

• Current Assignee: Rearden, LLC
• Original Assignee: Rearden, LLC
• Inventors: Forenza, Antonio, Perlman, Stephen G.
• Primary Examiner(s): LIU, JUNG
• Application Number:
  US13/797,971
• Publication Number:
  US 20140269642A1
• Time in Patent Office: 1,834 Days
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04J 11/003 at the transmitter transmission to multiple receive units in multiple input multiple output [MIMO] H04B7/0452; transmit antenna weighting H04B7/0615
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 25/4975 Correlative coding using Tomlinson precoding, Harashima precoding, Trellis precoding or GPRS

Abstract

A multiple antenna system (MAS) with multiuser (MU) transmissions (“MU-MAS”) exploiting inter-cell multiplexing gain via spatial processing to increase capacity in wireless communications networks.

Claims

1. A multiple antenna system (MAS) with multiuser (MU) transmissions (“

MU-MAS”

) comprising;

a plurality of distributed antennas or wireless transceivers distributed throughout a cell or coverage area and communicatively coupled to one or a plurality of spatial processing units via a wireline or wireless network;

a plurality of user equipment devices (UEs) communicatively coupled to the distributed antennas via a plurality of wireless links;

wherein each of the plurality of UEs receives the same cell ID; and

the distributed antennas cooperatively send or receive a plurality of signals that intentionally interfere to create a plurality of non-interfering data links with the UEs at the same time and within the same frequency band.

2. The system as in claim 1 wherein the plurality of distributed antennas are interconnected to a centralized processor (CP) via a base station network (BSN) and employing precoding to communicate with the plurality of UEs.

3. The system as in claim 1 wherein the wireless communications network is compatible with UEs supporting standard protocols, such as Long Term Evolution (LTE), Global System for Mobile (GSM), Universal Mobile Telecommunications System (UMTS), High Speed Packet Access (HSPA) Evolved High Speed Packet Access (HSPA+) and Code Division Multiple Access (CDMA).

4. The system as in claim 3 wherein the distributed antennas transmit the same cell ID via a primary synchronization signal (P-SS) and/or a secondary synchronization signal (S-SS).

5. The system as in claim 3 wherein all or a subset of the downlink resource blocks (RBs) are assigned to every UE and simultaneous non-interfering data streams are sent from the BTSs to the UEs via precoding.

6. The system as in claim 5 wherein precoding is used in combination with carrier aggregation (CA) and applied to different portions of the radio frequency (RF) spectrum (inter-band CA) or different bands within the same portion of the spectrum (intra-band CA) to increase per-user data rate.

7. The system as in claim 1 wherein the MU-MAS coverage area overlaps at least one cellular LTE network coverage area.

8. The system as in claim 1 wherein the MU-MAS is compatible with LTE-compatible UEs.

9. The system as in claim 1 wherein the MU-MAS utilizes a variant of the LTE standard.

10. The system as in claim 1 wherein the MU-MAS is concurrently compatible with LTE-compatible UEs and UEs that are not LTE-compatible.

11. The system as in claim 1 wherein MU-MAS is compatible with UEs that are not LTE-compatible.

12. The system as in claim 7 wherein spectrum is subdivided to support LTE protocol in a cellular configuration in one block of spectrum and LTE protocol in the MU-MAS system in another block of spectrum.

13. The system as in claim 7 wherein the cellular LTE protocol is coordinated with the MU-MAS LTE protocol such that the two LTE protocols share the same spectrum, but avoid interfering with each other by utilizing time division multiple access (TDMA) schemes.

14. The system as in claim 1 wherein the MU-MAS is employed as wireless backhaul to a second wireless network.

15. The system as in claim 1 wherein the MU-MAS concurrently supports mobile UEs and non-mobile UEs.

16. The system as in claim 1 wherein the MU-MAS employs round-robin or proportional fair scheduler or greedy techniques for scheduling the UEs for transmissions over the downlink (DL) or uplink (UL) channels.

17. The system as in claim 16 wherein the scheduler employs channel quality indicator (CQI), the sounding reference signal (SRS), the spatial selectivity indicator (SSI) or combinations of those as performance metrics for the scheduling method.

18. The system as in claim 16 wherein the scheduler selects the optimal subset of distributed antennas and UEs to be scheduled for transmission over the wireless link based on a link performance metric.

19. The system as in claim 16 wherein the scheduler selects the UEs to serve over the wireless link based on a performance metric.

20. The system as in claim 1 wherein transmit antenna selection methods are applied over all distributed antennas to select the optimal distributed antennas for the concurrent transmission over the DL channel.

21. The system as in claim 20 wherein the antenna selection method comprises of a queue of antenna subset IDs with respective priority numbers, such that antenna selection is applied only over a limited number of antenna subsets, thereby reducing computational complexity.

22. The system as in claim 21 wherein the queue is subdivided into two or multiple groups employing round-robin policy and sorting methods to select the limited number of antenna subsets to be employed by the antenna selection algorithm.

23. The system as in claim 6 wherein inter-band CA is enabled by implementing one LTE protocol to operate at lower carrier frequencies and other LTE protocols to operate at higher carrier frequencies, such that the two sets intersect or one set is the subset of the other.

24. The system as in claim 6 wherein the MU-MAS with precoding employs CA methods in conjunction with frequency hopping patterns to improve robustness against frequency-selective fading or interference.

25. The system as in claim 1 wherein the MU-MAS employs linear precoding methods (e.g. zero-forcing, block-diagonalization, matrix inversion, etc.).

26. The system as in claim 1 wherein the MU-MAS employs non-linear precoding methods (e.g., dirty-paper coding or Tomlinson-Harashima precoding, lattice techniques or trellis precoding, vector perturbation techniques).

27. The system as in claim 1 wherein the MU-MAS dynamically switches between linear and non-linear precoding methods based on the number of distributed antennas required to meet the data demands of active UEs to reduce computational complexity in the MU-MAS.

28. The system as in claim 1 wherein the MU-MAS switches between precoding multiplexing methods for UEs experiencing good channel quality and beamforming or diversity methods for UEs with poor link quality.

29. The system as in claim 4 wherein a subset of the distributed antennas transmit LTE broadcast channels (e.g., P-SS and S-SS) to UEs.

30. The system as in claim 29 wherein the subset of distributed antennas that transmits the LTE broadcast channels is selected to maximize the power received at the UEs over the broadcast channels.

31. The system as in claim 29 wherein the subset of distributed antennas that transmits the LTE broadcast channels is selected to avoid destructive interference at the UE.

32. The system as in claim 4 wherein the LTE broadcast channels are transmitted at higher power than the data resource blocks.

33. A method implemented within a multiple antenna system (MAS) with multiuser (MU) transmissions (“

MU-MAS”

) comprising of;

a plurality of distributed antennas or wireless transceivers distributed throughout a cell or coverage area and communicatively coupled to one or a plurality of spatial processing units via a wireline or wireless network;

a plurality of UEs communicatively coupled to the distributed antennas via a plurality of wireless links;

wherein each of the plurality of UEs receives the same cell ID; and

the distributed antennas cooperatively send or receive a plurality of signals that intentionally interfere to create a plurality of non-interfering data links with the UEs at the same time and within the same frequency band.

34. The method as in claim 33 wherein the plurality of distributed antennas are interconnected to a CP via a BSN and employing precoding to communicate with the plurality of UEs.

35. The method as in claim 33 wherein the wireless communications network is compatible with UEs supporting standard protocols, such as LTE, GSM, UMTS, HSPA, HSPA+ and CDMA.

36. The method as in claim 35 wherein the distributed antennas transmit the same cell ID via a P-SS and/or a S-SS.

37. The method as in claim 35 wherein all or a subset of the downlink RBs are assigned to every UE and simultaneous non-interfering data streams are sent from the BTSs to the UEs via precoding.

38. The method as in claim 37 wherein precoding is used in combination with CA and applied to different portions of the radio frequency (RF) spectrum (inter-band CA) or different bands within the same portion of the spectrum (intra-band CA) to increase per-user data rate.

39. The method as in claim 33 wherein the MU-MAS coverage area overlaps at least one cellular LTE network coverage area.

40. The method as in claim 33 wherein the MU-MAS is compatible with LTE-compatible UEs.

41. The method as in claim 33 wherein the MU-MAS utilizes a variant of the LTE standard.

42. The method as in claim 33 wherein the MU-MAS is concurrently compatible with LTE-compatible UEs and UEs that are not LTE-compatible.

43. The method as in claim 33 wherein MU-MAS is compatible with UEs that are not LTE-compatible.

44. The method as in claim 39 wherein spectrum is subdivided to support LTE protocol in a cellular configuration in one block of spectrum and LTE protocol in the MU-MAS in another block of spectrum.

45. The method as in claim 39 wherein the cellular LTE protocol is coordinated with the MU-MAS LTE protocol such that the two LTE protocols share the same spectrum, but avoid interfering with each other by utilizing TDMA schemes.

46. The method as in claim 33 wherein the MU-MAS is employed as wireless backhaul to a second wireless network.

47. The method as in claim 33 wherein the MU-MAS concurrently supports mobile UEs and non-mobile UEs.

48. The method as in claim 33 wherein the MU-MAS employs round-robin or proportional fair scheduler or greedy techniques for scheduling the UEs for transmissions over the DL or UL channels.

49. The method as in claim 48 wherein the scheduler employs CQI, the SRS, the SSI or combinations of those as performance metrics for the scheduling method.

50. The method as in claim 48 wherein the scheduler selects the optimal subset of distributed antennas and UEs to be scheduled for transmission over the wireless link based on a link performance metric.

51. The method as in claim 48 wherein the scheduler selects the UEs to serve over the wireless link based on a performance metric.

52. The method as in claim 33 wherein transmit antenna selection methods are applied over all distributed antennas to select the optimal distributed antennas for the concurrent transmission over the DL channel.

53. The method as in claim 52 wherein the antenna selection method comprises of a queue of antenna subset IDs with respective priority numbers, such that antenna selection is applied only over a limited number of antenna subsets, thereby reducing computational complexity.

54. The method as in claim 53 wherein the queue is subdivided into two or multiple groups employing round-robin policy and sorting methods to select the limited number of antenna subsets to be employed by the antenna selection algorithm.

55. The method as in claim 38 wherein inter-band CA is enabled by implementing one LTE protocol to operate at lower carrier frequencies and other LTE protocols to operate at higher carrier frequencies, such that the two sets intersect or one set is the subset of the other.

56. The method as in claim 38 wherein the MU-MAS with precoding employs CA methods in conjunction with frequency hopping patterns to improve robustness against frequency-selective fading or interference.

57. The method as in claim 33 wherein the MU-MAS employs linear precoding methods (e.g. zero-forcing, block-diagonalization, matrix inversion, etc.).

58. The method as in claim 33 wherein the MU-MAS employs non-linear precoding methods (e.g., dirty-paper coding or Tomlinson-Harashima precoding, lattice techniques or trellis precoding, vector perturbation techniques).

59. The method as in claim 33 wherein the MU-MAS dynamically switches between linear and non-linear precoding methods based on the number of distributed antennas required to meet the data demands of active UEs to reduce computational complexity in the MU-MAS.

60. The method as in claim 33 wherein the MU-MAS switches between precoding multiplexing methods for UEs experiencing good channel quality and beamforming or diversity methods for UEs with poor link quality.

61. The method as in claim 36 wherein a subset of the distributed antennas transmit LTE broadcast channels (e.g., P-SS and S-SS) to UEs.

62. The method as in claim 61 wherein the subset of distributed antennas that transmits the LTE broadcast channels is selected to maximize the power received at the UEs over the broadcast channels.

63. The method as in claim 61 wherein the subset of distributed antennas that transmits the LTE broadcast channels is selected to avoid destructive interference at the UE.

64. The method as in claim 36 wherein the LTE broadcast channels are transmitted at higher power than the data resource blocks.

65. A multiple antenna system (MAS) with multiuser (MU) transmissions (“

MU-MAS”

) comprising of;

a plurality of cooperative distributed antennas or wireless transceivers distributed throughout a cell or coverage area and communicatively coupled to one or a plurality of spatial processing units via a wireline or wireless network;

a plurality of user equipment devices (UEs) communicatively coupled to the distributed antennas via a plurality of wireless links;

wherein, for certain time and frequency intervals, different data streams are transmitted over the wireless links between the distributed antennas and each of a plurality of UEs, and

for certain other time and frequency intervals, the same data streams are transmitted over the wireless links between the distributed antennas and each of a plurality of UEs.

66. The system as in claim 65 wherein the wireless communications network is compatible with UEs supporting one or more standard protocols, such as LTE, GSM, UMTS, HSPA, HSPA+, CDMA or Wi-Fi.

67. The system as in claim 65 wherein the MU-MAS utilizes precoding to transmit or receive different data at the same time and frequency intervals to or from each of a plurality of UEs.

68. The system as in claim 65 wherein same data includes a cell ID.

69. The system as in claim 68 wherein the same cell ID is received by UEs via a S-SS.

70. The system as in claim 65 wherein the plurality of distributed antennas are interconnected to a CP via a BSN.

71. The system as in claim 65 wherein the same downlink RBs are assigned to a plurality of UEs and simultaneous non-interfering data streams are sent to the plurality of UEs via precoding.

72. The system as in claim 65 wherein the same uplink RBs are assigned to a plurality of UEs and simultaneous interfering data streams are received from the plurality UEs by the plurality of cooperative distributed antennas and decoded into non-interfering data streams.

73. The system as in claim 65 wherein precoding is used in combination with CA and applied to different portions of the radio frequency (RF) spectrum (inter-band CA) or different bands within the same portion of the spectrum (intra-band CA) to increase per-user data rate.

74. The system as in claim 65 wherein the MU-MAS coverage area overlaps at least one cellular LTE network coverage area.

75. The system as in claim 65 wherein the MU-MAS is concurrently compatible with LTE-compatible UEs and UEs that are not LTE-compatible.

76. The system as in claim 74 wherein spectrum is subdivided to support LTE protocol in a cellular configuration in one block of spectrum and LTE protocol in the MU-MAS system in another block of spectrum.

77. The system as in claim 74 wherein the cellular LTE protocol is coordinated with the MU-MAS LTE protocol such that the two LTE protocols share the same spectrum, but avoid interfering with each other by utilizing TDMA schemes.

78. The system as in claim 65 wherein MU-MAS is compatible with UEs that are not LTE-compatible.

79. The system as in claim 65 wherein the MU-MAS concurrently supports mobile UEs and non-mobile UEs.

80. The system as in claim 65 wherein the MU-MAS employs round-robin or proportional fair scheduler or greedy techniques for scheduling the UEs for transmissions over the downlink (DL) or uplink (UL) channels.

81. The system as in claim 80 wherein the scheduler employs CQI, the sounding reference signal (SRS), the spatial selectivity indicator (SSI) or combinations of those as performance metrics for the scheduling method.

82. The system as in claim 80 wherein the scheduler selects the optimal subset of distributed antennas and UEs to be scheduled for transmission over the wireless link based on a link performance metric.

83. The system as in claim 80 wherein the scheduler selects the UEs to serve over the wireless link based on a performance metric.

84. The system as in claim 65 wherein transmit antenna selection methods are applied over all distributed antennas to select the optimal distributed antennas for the concurrent transmission over the DL channel.

85. The system as in claim 84 wherein the antenna selection method comprises of a queue of antenna subset IDs with respective priority numbers, such that antenna selection is applied only over a limited number of antenna subsets, thereby reducing computational complexity.

86. The system as in claim 85 wherein the queue is subdivided into two or multiple groups employing round-robin policy and sorting methods to select the limited number of antenna subsets to be employed by the antenna selection algorithm.

87. The system as in claim 73 wherein inter-band CA is enabled by implementing one LTE protocol to operate at lower carrier frequencies and other LTE protocols to operate at higher carrier frequencies, such that the two sets intersect or one set is the subset of the other.

88. The system as in claim 73 wherein the MU-MAS with precoding employs CA methods in conjunction with frequency hopping patterns to improve robustness against frequency-selective fading or interference.

89. The system as in claim 65 wherein the MU-MAS employs linear precoding methods (e.g. zero-forcing, block-diagonalization, matrix inversion, etc.).

90. The system as in claim 65 wherein the MU-MAS employs non-linear precoding methods (e.g., dirty-paper coding or Tomlinson-Harashima precoding, lattice techniques or trellis precoding, vector perturbation techniques).

91. The system as in claim 65 wherein the MU-MAS dynamically switches between linear and non-linear precoding methods based on the number of distributed antennas required to meet the data demands of active UEs to reduce computational complexity in the MU-MAS.

92. The system as in claim 65 wherein the MU-MAS switches between precoding multiplexing methods for UEs experiencing good channel quality and beamforming or diversity methods for UEs with poor link quality.

93. The system as in claim 69 wherein a subset of the distributed antennas transmit LTE broadcast channels (e.g., P-SS and S-SS) to UEs.

94. The system as in claim 93 wherein the subset of distributed antennas that transmits the LTE broadcast channels is selected to maximize the power received at the UEs over the broadcast channels.

95. The system as in claim 93 wherein the subset of distributed antennas that transmits the LTE broadcast channels is selected to avoid destructive interference at the UE.

96. The system as in claim 67 wherein the LTE broadcast channels are transmitted at higher power than the data resource blocks.

97. The system as in claim 65 wherein the different data streams include at least one Downlink Control Information (DCI) message.

98. The system as in claim 97 wherein the same data streams include at least one Downlink Control Information (DCI) message.

99. The system as in claim 65 wherein the different data streams are precoded.

100. A method implemented within a multiple antenna system (MAS) with multiuser (MU) transmissions (“

MU-MAS”

) comprising of

a plurality of cooperative distributed antennas or wireless transceivers distributed throughout a cell or coverage area and communicatively coupled to one or a plurality of spatial processing units via a wireline or wireless network;

a plurality of user equipment devices (UEs) communicatively coupled to the distributed antennas via a plurality of wireless links;

wherein, for certain time and frequency intervals, different data streams are transmitted over the wireless links between the distributed antennas and each of a plurality of UEs, and

for certain other time and frequency intervals, the same data streams are transmitted over the wireless links between the distributed antennas and each of a plurality of UEs.

101. The system as in claim 100 wherein the wireless communications network is compatible with UEs supporting one or more standard protocols, such as LTE, GSM, UMTS, HSPA, HSPA+, CDMA or Wi-Fi.

102. The system as in claim 100 wherein the MU-MAS utilizes precoding to transmit or receive different data at the same time and frequency intervals to or from each of a plurality of UEs receiving.

103. The method as in claim 100 wherein same data includes a cell ID.

104. The method as in claim 103 wherein the same cell ID is received by UEs via a secondary synchronization signal (S-SS).

105. The method as in claim 100 wherein the plurality of distributed antennas are interconnected to a centralized processor (CP) via a base station network (BSN).

106. The method as in claim 100 wherein the same downlink resource blocks (RBs) are assigned to a plurality of UEs and simultaneous non-interfering data streams are sent to the plurality of UEs via precoding.

107. The method as in claim 100 wherein the same uplink resource blocks (RBs) are assigned to a plurality of UEs and simultaneous interfering data streams are received from the plurality UEs by the plurality of cooperative distributed antennas and decoded into non-interfering data streams.

108. The method as in claim 100 wherein precoding is used in combination with carrier aggregation (CA) and applied to different portions of the radio frequency (RF) spectrum (inter-band CA) or different bands within the same portion of the spectrum (intra-band CA) to increase per-user data rate.

109. The method as in claim 100 wherein the MU-MAS coverage area overlaps at least one cellular LTE network coverage area.

110. The method as in claim 100 wherein the MU-MAS is concurrently compatible with LTE-compatible UEs and UEs that are not LTE-compatible.

111. The method as in claim 109 wherein spectrum is subdivided to support LTE protocol in a cellular configuration in one block of spectrum and LTE protocol in the MU-MAS system in another block of spectrum.

112. The method as in claim 109 wherein the cellular LTE protocol is coordinated with the MU-MAS LTE protocol such that the two LTE protocols share the same spectrum, but avoid interfering with each other by utilizing TDMA schemes.

113. The method as in claim 100 wherein MU-MAS is compatible with UEs that are not LTE-compatible.

114. The method as in claim 100 wherein the MU-MAS concurrently supports mobile UEs and non-mobile UEs.

115. The method as in claim 100 wherein the MU-MAS employs round-robin or proportional fair scheduler or greedy techniques for scheduling the UEs for transmissions over the downlink (DL) or uplink (UL) channels.

116. The method as in claim 115 wherein the scheduler employs CQI, the SRS, the SSI or combinations of those as performance metrics for the scheduling method.

117. The method as in claim 115 wherein the scheduler selects the optimal subset of distributed antennas and UEs to be scheduled for transmission over the wireless link based on a link performance metric.

118. The method as in claim 115 wherein the scheduler selects the UEs to serve over the wireless link based on a performance metric.

119. The method as in claim 100 wherein transmit antenna selection methods are applied over all distributed antennas to select the optimal distributed antennas for the concurrent transmission over the DL channel.

120. The method as in claim 119 wherein the antenna selection method comprises of a queue of antenna subset IDs with respective priority numbers, such that antenna selection is applied only over a limited number of antenna subsets, thereby reducing computational complexity.

121. The method as in claim 120 wherein the queue is subdivided into two or multiple groups employing round-robin policy and sorting methods to select the limited number of antenna subsets to be employed by the antenna selection algorithm.

122. The method as in claim 108 wherein inter-band CA is enabled by implementing one LTE protocol to operate at lower carrier frequencies and other LTE protocols to operate at higher carrier frequencies, such that the two sets intersect or one set is the subset of the other.

123. The method as in claim 108 wherein the MU-MAS with precoding employs CA methods in conjunction with frequency hopping patterns to improve robustness against frequency-selective fading or interference.

124. The method as in claim 100 wherein the MU-MAS employs linear precoding methods (e.g. zero-forcing, block-diagonalization, matrix inversion, etc.).

125. The method as in claim 100 wherein the MU-MAS employs non-linear precoding methods (e.g., dirty-paper coding or Tomlinson-Harashima precoding, lattice techniques or trellis precoding, vector perturbation techniques).

126. The method as in claim 100 wherein the MU-MAS dynamically switches between linear and non-linear precoding methods based on the number of distributed antennas required to meet the data demands of active UEs to reduce computational complexity in the MU-MAS.

127. The method as in claim 100 wherein the MU-MAS switches between precoding multiplexing methods for UEs experiencing good channel quality and beamforming or diversity methods for UEs with poor link quality.

128. The method as in claim 104 wherein a subset of the distributed antennas transmit LTE broadcast channels (e.g., P-SS and S-SS) to UEs.

129. The method as in claim 128 wherein the subset of distributed antennas that transmits the LTE broadcast channels is selected to maximize the power received at the UEs over the broadcast channels.

130. The method as in claim 128 wherein the subset of distributed antennas that transmits the LTE broadcast channels is selected to avoid destructive interference at the UE.

131. The method as in claim 102 wherein the LTE broadcast channels are transmitted at higher power than the data resource blocks.

132. The method as in claim 100 wherein the different data streams include at least one Downlink Control Information (DCI) message.

133. The method as in claim 132 wherein the same data streams include at least one DCI message.

134. The method as in claim 100 wherein the different data streams are precoded.