System and method for reception mode switching in dual-carrier wireless backhaul networks
First Claim
1. A method for reception mode switching in a dual-carrier fixed wireless backhaul network comprising a plurality of nodes, said nodes comprising a plurality of Hub modules, each serving one or more remote backhaul modules (RBMs) through Hub-RBM radio links, the method comprising deploying RBMs comprising multimode RBMs which are selectively operable in a plurality of reception modes comprising a baseline reception mode and one or more other reception modes, using a primary carrier and a secondary carrier, the primary carrier being a licensed band and the secondary carrier being a lower cost shared band or an unlicensed band, wherein each multi-mode RBM comprises first and second Radio Frequency (RF) chains, the first RF chain comprising RF hardware and antenna elements for receiving and transmitting (RX/TX) on the primary carrier and the second RF chain comprising RF hardware and antenna elements configurable for RX/TX on the secondary carrier or for RX on the primary carrier;
- in a data collection phase;
obtaining baseline performance measurements for each RBM operating in the baseline reception mode, wherein the first RF chain operates for RX/TX on the primary carrier,identifying from said baseline performance measurements interference-challenged RBMs or link budget-challenged RBMs,for each interference-challenged RBM and link budget-challenged RBM obtaining further performance measurements for each of said one or more other RBM reception modes,said one or more other reception modes comprising at least a first reception mode with antenna/RF chain aggregation and resource borrowing on the primary carrier, wherein the first RF chain operates for RX/TX on the primary carrier and the second RF chain operates for RX on the primary carrier;
in a parameter selection phase;
based on said baseline performance measurements and further performance measurements for each interference-challenged RBM or link budget-challenged RBM, selecting from said plurality of reception modes a reception mode which provides a performance gain relative to the baseline reception mode; and
in a parameter application phase;
for each interference-challenged RBM or link budget-challenged RBM, switching to a respective selected reception mode.
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Accused Products
Abstract
A system and method for reception mode switching in a dual-carrier fixed wireless backhaul network is disclosed. The primary carrier is a licensed band. The secondary carrier may be a lower cost shared band or an unlicensed band. Multi-mode Remote Backhaul Modules (RBMs) comprise a first Radio Frequency (RF) chain with antenna elements for receive/transmit (RX/TX) on the primary carrier and a second RF chain with antenna elements for RX/TX on the secondary carrier. The Multi-mode RBMs adaptively switch from one reception mode to another with resource borrowing of RF and antenna elements, e.g. the secondary carrier RF chain and antenna elements can be borrowed for the primary carrier, for better reception capability for the primary carrier, reducing the number of link-budget and interference-challenged RBMs, and improving system performance. The system may comprise a dual carrier and single carrier Multiple-Input Multiple-Output (MIMO) system with variable antenna topology, having flexibility to switch dynamically between different operational modes depending on performance metrics.
13 Citations
26 Claims
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1. A method for reception mode switching in a dual-carrier fixed wireless backhaul network comprising a plurality of nodes, said nodes comprising a plurality of Hub modules, each serving one or more remote backhaul modules (RBMs) through Hub-RBM radio links, the method comprising deploying RBMs comprising multimode RBMs which are selectively operable in a plurality of reception modes comprising a baseline reception mode and one or more other reception modes, using a primary carrier and a secondary carrier, the primary carrier being a licensed band and the secondary carrier being a lower cost shared band or an unlicensed band, wherein each multi-mode RBM comprises first and second Radio Frequency (RF) chains, the first RF chain comprising RF hardware and antenna elements for receiving and transmitting (RX/TX) on the primary carrier and the second RF chain comprising RF hardware and antenna elements configurable for RX/TX on the secondary carrier or for RX on the primary carrier;
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in a data collection phase; obtaining baseline performance measurements for each RBM operating in the baseline reception mode, wherein the first RF chain operates for RX/TX on the primary carrier, identifying from said baseline performance measurements interference-challenged RBMs or link budget-challenged RBMs, for each interference-challenged RBM and link budget-challenged RBM obtaining further performance measurements for each of said one or more other RBM reception modes, said one or more other reception modes comprising at least a first reception mode with antenna/RF chain aggregation and resource borrowing on the primary carrier, wherein the first RF chain operates for RX/TX on the primary carrier and the second RF chain operates for RX on the primary carrier; in a parameter selection phase; based on said baseline performance measurements and further performance measurements for each interference-challenged RBM or link budget-challenged RBM, selecting from said plurality of reception modes a reception mode which provides a performance gain relative to the baseline reception mode; and in a parameter application phase; for each interference-challenged RBM or link budget-challenged RBM, switching to a respective selected reception mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system comprising a dual-carrier fixed wireless backhaul network comprising a plurality of nodes, said nodes comprising a plurality of Hub modules, each serving one or a plurality of remote backhaul modules (RBMs) through Hub-RBM radio links, and wherein at least some of the RBMs comprise multi-mode RBMs that are selectively operable in a plurality of reception modes comprising a baseline reception mode and one or more other reception modes using a primary carrier and a secondary carrier, wherein the primary carrier is a licensed band and the secondary carrier is a lower cost shared band or an unlicensed band, each multi-mode RBM comprising first and second RF chains, the first RF chain comprising RF hardware and antenna elements for receiving and transmitting (RX/TX) on the primary carrier and the second RF chain comprising RF hardware and antenna elements configurable for RX/TX on the secondary carrier or for RX on the primary carrier, and switching means for switching between the baseline reception mode and said one or more other reception modes by signaling a selected reception mode to a baseband processor of each RBM and configuring a connection between the first and second RF chains of the RBM for operating in the selected reception mode;
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wherein in the baseline reception mode;
the first RF chain operates for RX/TX on the primary carrier and the second RF chain operates for RX/TX on the secondary carrier; andwherein the one or more other reception modes comprise at least a first reception mode with antenna/RF chain aggregation and resource borrowing on the primary carrier, wherein the first RF chain operates for RX/TX on the primary carrier and the second RF chain operates for RX on the primary carrier. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification