EP-3709586-B1 - SYSTEMS AND METHODS FOR EXPLOITING INTER-CELL MULTIPLEXING GAIN IN WIRELESS CELLULAR SYSTEMS VIA DISTRIBUTED INPUT DISTRIBUTED OUTPUT TECHNOLOGY

Inventors

• FORENZA, ANTONIO
• PERLMAN, STEPHEN G.

Dates

Publication Date

20260506

Application Date

20140312

Claims (2)

1. A multiple antenna system "MAS" with multiuser "MU" transmissions "MU-MAS" comprising: a plurality of antennas or wireless transceiver devices "BTSs" grouped into an antenna cluster and distributed throughout a coverage area without cells, wherein the plurality of antennas or BTSs in the antenna cluster all share the same cell identifier "cell ID"; a plurality of wireless user devices "UEs" communicatively coupled to the BTSs, wherein all of the BTSs in the antenna cluster transmit the same cell ID to the UEs via primary and secondary synchronization signals (P-SS and S-SS) sent over a primary and the secondary LTE synchronization channel (PSCH and SSCH); if more BTSs are available than active BTSs, the MU-MAS chooses a first subset of BTSs and UEs for downlink and uplink data communications based on the spatial diversity between the UEs and BTSs according to a scheduling criterion; and a spatial processing unit exploits interference among the BTSs produced by transmitting overlapping simultaneous transmissions in the same frequency band to create a plurality of concurrent non-interfering downlink "DL" data links between the first subset of BTSs and the UEs within the same frequency band, wherein the MU-MAS is a cellular network or LTE network, the UEs are LTE user equipments "LTE-UEs", the distributed antennas are LTE enhanced NodeBs "eNodeBs" or mobility management entities "MMEs" interconnected between each other or to an LTE gateway "GW" through a wireline network comprising of S1 or X2 interfaces.
2. A method implemented within a multiuser multiple antenna system "MU-MAS" comprising: distributing a plurality of BTSs throughout a coverage area without cells, wherein the plurality of BTSs are grouped into an antenna cluster and all share the same cell ID; communicatively coupling a plurality of UEs to the BTSs, wherein the BTSs in the antenna cluster transmit the same cell ID to the UEs via primary and secondary synchronization signals (P-SS and S-SS) sent over a primary and the secondary LTE synchronization channel (PSCH and SSCH); if more BTSs are available than active BTSs, the MU-MAS choosing a first subset of BTSs and UEs for downlink and uplink data communications based on the spatial diversity between the UEs and BTSs according to a scheduling criterion; and exploiting interference among the BTSs produced by transmitting overlapping simultaneous transmissions in the same frequency band to create a plurality of concurrent non-interfering DL data links between the first subset of BTSs and the UEs within the same frequency band, wherein the MU-MAS is a cellular network or LTE network, the UEs are LTE user equipments "LTE-UEs", the distributed antennas are LTE enhanced NodeBs "eNodeBs" or mobility management entities "MMEs" interconnected between each other or to an LTE gateway "GW" through a wireline network comprising of S1 or X2 interfaces.

Description

RELATED APPLICATIONS This application may be related to the following co-pending U.S. Patent Applications/U.S. Patents: U.S. Application Serial No. 13/633,702, entitled "Systems and Methods for wireless backhaul in distributed-input distributed-output wireless systems"U.S. Application Serial No. 13/475,598, entitled "Systems and Methods to enhance spatial diversity in distributed-input distributed-output wireless systems"U.S. Application Serial No. 13/233,006, entitled "System and Methods for planned evolution and obsolescence of multiuser spectrum"U.S. Application Serial No. 13/232,996, entitled "Systems and Methods to Exploit Areas of Coherence in Wireless Systems"U.S. Application Serial No. 13/464,648, entitled "System and Methods to Compensate for Doppler Effects in Distributed-Input Distributed Output Systems"U.S. Application Serial No. 12/917,257, entitled "Systems And Methods To Coordinate Transmissions In Distributed Wireless Systems Via User Clustering"U.S. Application Serial No. 12/802,988, entitled "Interference Management, Handoff, Power Control And Link Adaptation In Distributed-Input Distributed-Output (DIDO) Communication Systems"U.S. Application Serial No. 12/802,974, entitled "System And Method For Managing Inter-Cluster Handoff Of Clients Which Traverse Multiple DIDO Clusters"U.S. Application Serial No. 12/802,989, entitled "System And Method For Managing Handoff Of A Client Between Different Distributed-Input-Distributed-Output (DIDO) Networks Based On Detected Velocity Of The Client"U.S. Application Serial No. 12/802,958, entitled "System And Method For Power Control And Antenna Grouping In A Distributed-Input-Distributed-Output (DIDO) Network"U.S. Application Serial No. 12/802,975, entitled "System And Method For Link adaptation In DIDO Multicarrier Systems"U.S. Application Serial No. 12/802,938, entitled "System And Method For DIDO Precoding Interpolation In Multicarrier Systems"U.S. Application Serial No. 12/630,627, entitled "System and Method For Distributed Antenna Wireless Communications"U.S. Patent No. 8,170,081, issued May 1, 2012, entitled "System And Method For Adjusting DIDO Interference Cancellation Based On Signal Strength Measurements"U.S. Patent No. 8,160,121, issued Apr. 17, 2012, entitled, "System and Method For Distributed Input-Distributed Output Wireless Communications";U.S. Patent No. 7,885,354, issued Feb. 8, 2011, entitled "System and Method For Enhancing Near Vertical Incidence Skywave ("NVIS") Communication Using Space-Time Coding."U.S. Patent No. 7,711,030, issued May 4, 2010, entitled "System and Method For Spatial-Multiplexed Tropospheric Scatter Communications";U.S. Patent No. 7,636,381, issued Dec. 22, 2009, entitled "System and Method for Distributed Input Distributed Output Wireless Communication";U.S. Patent No. 7,633,994, issued Dec. 15, 2009, entitled "System and Method for Distributed Input Distributed Output Wireless Communication";U.S. Patent No. 7,599,420, issued Oct. 6, 2009, entitled "System and Method for Distributed Input Distributed Output Wireless Communication";U.S. Patent No. 7,418,053, issued Aug. 26, 2008, entitled "System and Method for Distributed Input Distributed Output Wireless Communication"; BACKGROUND In the last three decades, the wireless cellular market has experienced increasing number of subscribers worldwide as well as demand for better services shifting from voice to web-browsing and real-time HD video streaming. This increasing demand for services that requires higher data rate, lower latency and improved reliability has driven a radical evolution of wireless technologies through different standards. Beginning from the first generation analog AMPS and TACS (for voice service) in the early 1980s, to 2G and 2.5G digital GSM, IS-95 and GPRS (for voice and data services) in the 1990s, to 3G with UMTS and CDMA2000 (for web-browsing) in the early 2000s, and finally LTE (for high-speed internet connectivity) currently under deployment in different countries worldwide. Long-term evolution (LTE) is the standard developed by the 3rd generation partnership project (3GPP) for fourth generation (4G) wireless cellular systems. LTE can achieve theoretically up to 4x improvement in downlink spectral efficiency over previous 3G and HSPA+ standards by exploiting the spatial components of wireless channels via multiple-input multiple-output (MIMO) technology. LTE-Advanced is the evolution of LTE, currently under standardization, that will enable theoretically up to 8x increase in spectral efficiency over 3G standard systems. Despite this technology evolution, it is very likely that in the next three years wireless carriers will not be able to satisfy the growing demand for data rate due to raising market penetration of smartphones and tables, offering more data-hungry applications like real-time HD video streaming, video conferencing and gaming. It has been estimated that capacity of wireless networks will grow 5x in Europe from 2011 to 2015