Intelligent backhaul radio

• US 8,311,023 B1
• Filed: 02/10/2012
• Issued: 11/13/2012
• Est. Priority Date: 08/17/2011
• Status: Active Grant

• Current Assignee: COMS IP Holdings LLC
• Original Assignee: CBF Networks, Inc. (COMSovereign Holding Corp.)
• Inventors: Negus, Kevin J.
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): Sharma, Gautam
• Application Number:
  US13/371,366
• Time in Patent Office: 277 Days
• Field of Search: None
• US Class Current: 370/338
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• CPC Class Codes: H01Q 25/00 Antennas or antenna systems providing at least two radiating patterns arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00
• CPC Class Codes: H01Q 25/005 providing two patterns of opposite direction; back to back antennas H01Q25/004 takes precedence
• CPC Class Codes: H01Q 5/50 Feeding or matching arrangements for broad-band or multi-band operation
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04B 2001/0408 with power amplifiers
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 25/03019 adaptive, i.e. capable of adjustment during data reception
• CPC Class Codes: H04L 27/01 Equalisers baseband equalizers at the transmitter end H04L25/03343; in analogue transmission systems H04B3/04, H04B7/005
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 27/2678 using cyclostationarities, e.g. cyclic prefix or postfix
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 24/02 : Arrangements for optimising operational condition
• CPC Class Codes: H04W 52/52 : using AGC [Automatic Gain Control] circuits or amplifiers
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 72/0453 : Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 76/27 : Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 84/12 : WLAN [Wireless Local Area Networks]

Abstract

A intelligent backhaul radio is disclosed that is compact, light and low power for street level mounting, operates at 100 Mb/s or higher at ranges of 300 m or longer in obstructed LOS conditions with low latencies of 5 ms or less, can support PTP and PMP topologies, uses radio spectrum resources efficiently and does not require precise physical antenna alignment.

Claims

1. An intelligent backhaul radio comprising:

one or more demodulator cores, wherein each demodulator core demodulates one or more receive symbol streams to produce a respective receive data interface stream,

a plurality of receive radio frequency (RF) chains to convert from a plurality of receive RF signals to a plurality of respective receive chain output signals;

a frequency selective receive path channel multiplexer, interposed between the one or more demodulator cores and the plurality of receive RF chains, to produce the one or more receive symbol streams provided to the one or more demodulator cores from the plurality of receive chain output signals;

one or more modulator cores, wherein each modulator core modulates a respective transmit data interface stream to produce one or more transmit symbol streams;

a plurality of transmit RF chains to convert from a plurality of transmit chain input signals to a plurality of respective transmit RF signals;

a transmit path channel multiplexer, interposed between the one or more modulator cores and the plurality of transmit RF chains, to produce the plurality of transmit chain input signals provided to the plurality of transmit RF chains from the one or more transmit symbol streams;

an antenna array comprising;

a plurality of directive gain antenna elements;

one or more selectable RF connections that selectively couple certain of the plurality of directive gain antenna elements to certain of the plurality of receive RF chains, wherein the number of directive gain antenna elements that can be selectively coupled to receive RF chains exceeds the number of receive RF chains that can accept receive RF signals from the one or more selectable RF connections; and

a plurality of RF connections to couple at least certain of the plurality of directive gain antenna elements to the plurality of transmit RF chains;

a radio resource controller, wherein the radio resource controller sets or causes to be set the specific selective couplings between the certain of the plurality of directive gain antenna elements and the certain of the plurality of receive RF chains;

an interface bridge configured to couple the intelligent backhaul radio to a data network, the interface bridge comprising one or more Ethernet interfaces to couple the interface bridge to the data network, the interface bridge multiplexing and buffering the one or more Ethernet interfaces;

a media access controller to exchange data to and from the data network via coupling to at least the interface bridge and to and from at least one other intelligent backhaul radio; and

a radio link controller, wherein the radio link controller sets or causes to be set certain modulation mapping or forward error correction encoding parameters for the one or more modulator cores.

2. The intelligent backhaul radio of claim 1, wherein the radio resource controller further sets or causes to be set at least one of a transmit RF carrier frequency, a transmit channel bandwidth and a number of active receive RF chains.

3. The intelligent backhaul radio of claim 1, wherein the set of receive RF chains that can accept receive RF signals from the one or more selectable RF connections is divided between one subset that accepts receive RF signals from directive gain antenna elements with a first polarization and a second subset that accepts receive RF signals from directive gain antenna elements with a second polarization.

4. The intelligent backhaul radio of claim 1, wherein the directive gain antenna elements that can be selectively coupled to receive RF chains are arranged on a plurality of facets with one or more directive gain antenna elements per facet, and wherein each facet is oriented at a different angle in the azimuth relative to at least one other facet.

5. The intelligent backhaul radio of claim 1, wherein the number of transmit RF chains equals the number of transmit symbol streams.

6. The intelligent backhaul radio of claim 1, wherein the transmit path channel multiplexer couples the plurality of transmit RF chains to respective transmit symbol streams such that each respective transmit chain input signal comprises information from only one respective transmit symbol stream.

7. The intelligent backhaul radio of claim 1, wherein the number of transmit RF chains exceeds the number of transmit symbol streams, and wherein transmit path channel multiplexer couples at least one set of two or more of the plurality of transmit RF chains to a particular transmit symbol stream such that each transmit chain input signal for a particular set of two or more of the plurality of transmit RF chains comprises information from only the one respective particular transmit symbol stream.

8. The intelligent backhaul radio of claim 1, wherein the set of the plurality of directive gain antenna elements that can be coupled to the plurality of transmit RF chains is different than the set of the plurality of directive gain antenna elements that can be coupled to the plurality of receive RF chains.

9. The intelligent backhaul radio of claim 1, wherein the number of directive gain antenna elements that can be coupled to the plurality of transmit RF chains equals the number of transmit RF chains.

10. The intelligent backhaul radio of claim 1, wherein the antenna array further comprises:

a plurality of transmit power amplifiers, wherein each transmit power amplifier can be coupled to at least one of the plurality of transmit RF chains and to at least one of the plurality of directive gain antenna elements that can be coupled to the plurality of transmit RF chains.

11. The intelligent backhaul radio of claim 1, wherein at least two or more of the directive gain antenna elements that can be coupled to transmit RF chains are oriented in different directions to provide directional diversity.

12. The intelligent backhaul radio of claim 1, wherein the set of directive gain antenna elements that can be coupled to transmit RF chains include directive gain antenna elements of at least two different orthogonal polarizations.

13. The intelligent backhaul radio of claim 1, wherein the set of the directive gain antenna elements that can be coupled to transmit RF chains is divided between one subset with a first transmit polarization and a second subset with a second transmit polarization.

14. The intelligent backhaul radio of claim 13, wherein the first transmit polarization is vertical and the second transmit polarization is horizontal.

15. The intelligent backhaul radio of claim 13, wherein the set of transmit RF chains that can provide transmit RF signals to the one or more RF connections is divided between one subset that provides transmit RF signals to directive gain antenna elements with the first transmit polarization and a second subset that provides transmit RF signals to directive gain antenna elements with the second transmit polarization.

16. The intelligent backhaul radio of claim 1, wherein at least two of the directive gain antenna elements that can be coupled to transmit RF chains are each arranged on separate respective facets amongst a plurality of facets with one or more directive gain antenna elements per facet, and wherein each facet is oriented at a different angle in the azimuth relative to at least one other facet.

17. The intelligent backhaul radio of claim 1, wherein at least one of the directive gain antenna elements that can be coupled to transmit RF chains is arranged on a facet with no directive gain antenna element that can be coupled to any receive RF chain.

18. The intelligent backhaul radio of claim 1, wherein the directive gain antenna elements that can be coupled to transmit RF chains are arranged on one or more facets, and wherein the one or more facets do not include a directive gain antenna element that can be coupled to a receive RF chain.

19. The intelligent backhaul radio of claim 1, wherein at least one of the one or more modulator cores produces at least two transmit symbol streams and such at least one of the one or more modulator cores further comprises:

a stream parser, interposed between the transmit data interface and the at least two symbol groupers, to split a stream of data within the modulator core into two or more sub-streams.

20. The intelligent backhaul radio of claim 1, wherein at least one of the one or more demodulator cores demodulates at least two receive symbol streams and wherein such at least one of the one or more demodulator cores further comprises:

a stream multiplexer, interposed between the receive data interface and the at least two soft decision symbol demappers, to combine two or more sub-streams of data within the demodulator core into a single stream.

21. The intelligent backhaul radio of claim 1, wherein a respective block of training pilots from a pilot symbol library within or coupled to the transmit path channel multiplexer is selectively applied to each of the one or more transmit symbol streams.

22. The intelligent backhaul radio of claim 1, wherein a pilot symbol library within or coupled to the transmit path channel multiplexer supplies pilot symbols for selective insertion at predetermined positions within certain successive blocks of symbols from the one or more transmit symbol streams.

23. The intelligent backhaul radio of claim 1, wherein a respective block of training pilots from a pilot data library within or coupled to one or more modulator cores is selectively applied to each of the one or more transmit symbol streams.

24. The intelligent backhaul radio of claim 1, wherein a pilot data library within or coupled to one or more modulator cores supplies pilot data for selective insertion at predetermined positions within certain successive blocks of symbols from the one or more transmit symbol streams.

25. The intelligent backhaul radio of claim 1, wherein the radio link controller sets or causes to be set certain parameters within the plurality of transmit RF chains or a plurality of transmit power amplifiers each coupled to a respective transmit RF chain related to the transmitted signal power from the intelligent backhaul radio.

26. The intelligent backhaul radio of claim 1, wherein the radio link controller composes or causes to be composed a control frame to be sent via the media access controller to another radio link controller in another intelligent backhaul radio.

27. The intelligent backhaul radio of claim 1, wherein the radio resource controller composes or causes to be composed a control frame to be sent via the media access controller to another radio resource controller in another intelligent backhaul radio.

28. The intelligent backhaul radio of claim 1, further comprising:

an intelligent backhaul management system agent that sets or causes to be set certain policies relevant to the radio resource controller, wherein the intelligent backhaul management system agent exchanges information with other intelligent backhaul management system agents within other intelligent backhaul radios or with one or more intelligent backhaul management system servers.