Scheduling for RF over fiber optic cable [RFoG]
First Claim
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1. A Cable Modem Termination System (CMTS) for use in a radio frequency over glass (RFoG) network comprising:
- a scheduler stored in non-transitory machine-readable media for scheduling upstream bandwidth for cable modems (CMs) via an optical network having optical network units for transmitting upstream channels by the respective cable modems, and at least one optical splitter for optically aggregating the upstream channels;
wherein the scheduler is arranged to replicate upstream bandwidth allocation grants for all of the upstream channels that are available to the cable modems, ensuring all of the upstream channels are temporally aligned and that no cable modems are scheduled for upstream transmission at the same time, even if on different frequencies, so that the optical network units do not optically interfere with each other relative to the optical aggregation of the upstream channels for avoidance of optical beat interference.
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Abstract
A method for use in an RFoG cable network calls for allocating upstream bandwidth to CM devices, wherein allocating bandwidth includes selecting a start time and allocating respective time slots relative to the selected start time to at least one of the requesting CM devices; and further, allocating the same timeslots over multiple selected upstream channels, thereby aligning upstream transmissions from the requesting CMs across the selected upstream channels. Several embodiments are disclosed to enable DOCSIS 3.0 type scheduling over an RFoG network.
19 Citations
21 Claims
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1. A Cable Modem Termination System (CMTS) for use in a radio frequency over glass (RFoG) network comprising:
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a scheduler stored in non-transitory machine-readable media for scheduling upstream bandwidth for cable modems (CMs) via an optical network having optical network units for transmitting upstream channels by the respective cable modems, and at least one optical splitter for optically aggregating the upstream channels; wherein the scheduler is arranged to replicate upstream bandwidth allocation grants for all of the upstream channels that are available to the cable modems, ensuring all of the upstream channels are temporally aligned and that no cable modems are scheduled for upstream transmission at the same time, even if on different frequencies, so that the optical network units do not optically interfere with each other relative to the optical aggregation of the upstream channels for avoidance of optical beat interference. - View Dependent Claims (2, 3, 4, 5)
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6. Scheduler software code stored in non-transitory machine-readable media for execution on a processor in a radio frequency over glass (RFoG) network, the code comprising:
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first code for receiving upstream bandwidth requests from a plurality of cable modem (CM) devices in the RFoG network, the RFoG network including optical network units for transmitting the upstream channels by the respective cable modems, and at least one optical splitter for optically aggregating the upstream channels; second code for allocating upstream bandwidth responsive to the requests, the allocations including selecting a start time and allocating respective time slots relative to the selected start time to at least one of the requesting CM devices; and third code for replicating the time slot allocations for all of the upstream channels that are available to the cable modems, ensuring all of the upstream channels are temporally aligned and that no cable modems are scheduled for upstream transmission at the same time, even if on different frequencies, so that the optical network units do not optically interfere with each other relative to the optical aggregation of the upstream channels for avoidance of optical beat interference. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for use in a radio frequency over glass (RFoG) cable network comprising:
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determining upstream bandwidth requirements for a plurality of cable modem (CM) devices in the RFoG network, each CM device having a corresponding service identifier (SID), the RFoG network including optical network units for transmitting the upstream channels by the respective CM devices, and at least one optical splitter for optically aggregating the upstream channels; and allocating bandwidth to the CMs, wherein allocating bandwidth includes; selecting a start time and allocating respective time slots relative to the selected start time to at least one of the CM devices; and allocating the same timeslots relative to the selected start time for all of the upstream channels that are available to the cable modems, thereby aligning upstream transmissions from the CMs across all of the upstream channels available to the cable modems and ensuring no cable modems are scheduled for upstream transmission at the same time, even if on different frequencies, so that the optical network units do not optically interfere with each other relative to aggregation of the upstream channels for avoidance of optical beat interference. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification