SYSTEM AND METHOD FOR JOINT SCHEDULING IN DUAL-CARRIER WIRELESS BACKHAUL NETWORKS
First Claim
1. A method of joint scheduling in a dual-carrier fixed wireless backhaul network comprising a plurality of nodes comprising a plurality of Hub modules, each Hub module serving one or more remote backhaul modules (RBMs) through Hub-RBM radio links and operating with a primary carrier and a secondary or shared carrier, wherein the method comprises:
- providing a frame structure comprising control signaling messages on the primary carrier for RBMs using the primary or secondary carriers;
performing network entry for each RBM on the primary carrier; and
each Hub transmitting a broadcast frame on the primary carrier assigning each served RBM to the primary carrier or the secondary carrier.
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Accused Products
Abstract
A system and method for joint scheduling in a dual-carrier fixed wireless backhaul network is disclosed, wherein the primary carrier is a licensed band, and the secondary carrier is an unlicensed or lower cost shared carrier. The network comprises a plurality of Hub modules, each serving a cluster of one or more Remote backhaul modules (RBMs). A special frame structure and a control channel on the primary carrier carries control signalling messages for RBMs assigned to either the primary or secondary carrier. RBMs with a performance metric, such a spectral efficiency, above a threshold are assigned to the primary carrier. Other RBMs are assigned the secondary carrier, and a channel assignment is then performed. A transmission mode is determined based on instantaneous channel conditions, to optimize overall system performance across a network neighbourhood and meet RBM quality of service requirements. A centralized server/processing unit coordinates dual carrier joint scheduling functions.
7 Citations
24 Claims
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1. A method of joint scheduling in a dual-carrier fixed wireless backhaul network comprising a plurality of nodes comprising a plurality of Hub modules, each Hub module serving one or more remote backhaul modules (RBMs) through Hub-RBM radio links and operating with a primary carrier and a secondary or shared carrier, wherein the method comprises:
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providing a frame structure comprising control signaling messages on the primary carrier for RBMs using the primary or secondary carriers; performing network entry for each RBM on the primary carrier; and each Hub transmitting a broadcast frame on the primary carrier assigning each served RBM to the primary carrier or the secondary carrier. - View Dependent Claims (2, 3)
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4. A method of joint scheduling in a dual-carrier fixed wireless backhaul network comprising a plurality of nodes, each node comprising a plurality of Hub modules, each Hub module serving one or more remote backhaul modules (RBMs) through Hub-RBM radio links and operating with a primary carrier and a secondary carrier, wherein the method comprises:
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in an initialization phase; performing Hub-RBM clustering comprising associating each RBM to a respective serving Hub; and
for Hubs and/or RBMs having one or more beams, performing Hub-beam selection and RBM-beam selection for each Hub-RBM radio link;obtaining initial performance metrics, including pathloss information, for Hub-RBM radio links between each RBM and its respective serving Hub using the primary carrier, and storing said performance metrics for each Hub-RBM link in a centralized processing unit; in a data collection phase; for Hub-RBM links for each Hub and respective served RBMs of at least part of the network (neighborhood); g) obtaining a performance metric and computing a utility gain for each of a plurality of time slot assignments on the primary carrier; h) obtaining a performance metric and computing a utility gain for each of a plurality of time slot assignments on the secondary carrier and for each channel of the secondary carrier; in a parameter selection phase; i) storing in the centralized processing unit, tables (maps) of utility gain values from steps a) and b) and computing therefrom a maximum achievable sum utility over the neighborhood; j) selecting for each RBM a time slot of the primary carrier;
ora time slot of the secondary carrier; to optimize the sum utility over the neighborhood; in a parameter application phase; k) scheduling each RBM to the selected carrier and time slot; and l) for each Hub-RBM radio link, selecting a transmission mode and a Modulation and Coding Scheme (MCS) based on instantaneous channel conditions and to meet an RBM quality of service requirement. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification