Two-dimensional scheduling scheme for a broadband wireless access system
First Claim
1. A method for scheduling upstream channel transmission by a wireless modem of a plurality of wireless modems in communication with a wireless hub in a broadband wireless access system, comprising:
- synchronizing the wireless modem with a wireless hub on a downstream channel by synchronizing the symbol timing, forward error correcting framing, and recognition of a synchronization message at the wireless modem;
receiving at the wireless modem on the downstream channel at least one message comprising information regarding parameters for communicating over each of a plurality of upstream channels;
utilizing one upstream channel of the plurality of upstream channels to communicate from the wireless modem to the wireless hub for one burst;
transmitting from the wireless hub to the wireless modem on the downstream channel at least one message regarding a change to some of the parameters for communicating over at least some of the plurality of upstream channels;
utilizing another upstream channel of the plurality of upstream channels for another burst to communicate from the wireless modem to the wireless hub based upon the change to some of the parameters for communicating over each of the plurality of upstream channels, allocating each of said plurality of upstream channels to different of said plurality of wireless modems for communication bursts on a predetermined schedule; and
calibrating parameters of each of the plurality of upstream channels for each of the modems using the communication bursts between each respective modem and the wireless hub;
wherein said step of allocating comprises the step of sending a special message to communicate with a modem and cause a communication burst if the modem is not communicating with said hub at a rate sufficient to meet the minimum allocation rate assigned to the modem.
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Abstract
A two dimensional scheduler integrates the allocation of both the time domain and the channel domain for upstream communication in a broadband wireless access system. This allows for the optimization of system resource usage and allows for dynamic switching between a number of different upstream channels by a modem. Modems are calibrated via a calibration message constructed at the hub by measuring some parameters of communication bursts between the modem to the hub. The modems rotate in using the available upstream channels so that each available channel is fully calibrated using actual communication bursts, keeping the parameters for each channel ready for use when assigned for communicating on any of the available channels.
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Citations
22 Claims
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1. A method for scheduling upstream channel transmission by a wireless modem of a plurality of wireless modems in communication with a wireless hub in a broadband wireless access system, comprising:
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synchronizing the wireless modem with a wireless hub on a downstream channel by synchronizing the symbol timing, forward error correcting framing, and recognition of a synchronization message at the wireless modem;
receiving at the wireless modem on the downstream channel at least one message comprising information regarding parameters for communicating over each of a plurality of upstream channels;
utilizing one upstream channel of the plurality of upstream channels to communicate from the wireless modem to the wireless hub for one burst;
transmitting from the wireless hub to the wireless modem on the downstream channel at least one message regarding a change to some of the parameters for communicating over at least some of the plurality of upstream channels;
utilizing another upstream channel of the plurality of upstream channels for another burst to communicate from the wireless modem to the wireless hub based upon the change to some of the parameters for communicating over each of the plurality of upstream channels, allocating each of said plurality of upstream channels to different of said plurality of wireless modems for communication bursts on a predetermined schedule; and
calibrating parameters of each of the plurality of upstream channels for each of the modems using the communication bursts between each respective modem and the wireless hub;
wherein said step of allocating comprises the step of sending a special message to communicate with a modem and cause a communication burst if the modem is not communicating with said hub at a rate sufficient to meet the minimum allocation rate assigned to the modem. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 18, 19, 20, 22)
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12. A method of calibrating a modem in a communication system, comprising the steps of:
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measuring parameters of messages received by a hub communicating with said modem;
sending a correction message from the hub to the modem; and
changing the parameters at the modem;
wherein said step of sending comprises the step of sending special message to communicate with a modem and cause a communication burst if the modem is not communicating with said hub at a rate sufficient to meet the minimum allocation rate assigned to the modem. - View Dependent Claims (13, 14, 15, 16, 17)
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21. A method according for scheduling upstream channel transmission by a wireless modem of plurality of wireless modems in communication with a wireless hub in a broadband wireless access system, comprising:
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synchronizing the wireless modem with a wireless hub on a downstream channel by synchronizing the symbol timing, forward error correction framing, and recognition of a synchronization message at the wireless modem;
receiving at the wireless modem on the downstream channel at least one message comprising information regarding parameters for communicating over each of a plurality of upstream channels;
utilizing one upstream channel of the plurality of upstream channels to communicate from the wireless modem to the wireless hub for one burst;
transmitting from the wireless hub to the wireless modem on the downstream channel at least one message regarding a change to some of the parameters for communicating over at least some of the plurality of upstream channels;
utilizing another upstream channel of the plurality of upstream channels for another burst to communicate from the wireless modem to the wireless hub based upon the change to some of the parameters for communicating over each of the plurality of upstream channels, allocating each of said plurality of upstream channels to different of said plurality of wireless modems for communication bursts on a predetermined schedule; and
calibrating parameters of each of the plurality of upstream channels for each of the modems using the communication bursts between each respective modem and the wireless hub, wherein;
said step of utilizing another upstream channel comprises utilizing at least one other upstream channel of the plurality of upstream channels for other communication bursts from the wireless modem to the wireless hub;
switching between the one upstream channel and the other upstream channels based on the parameters for communicating over each of the plurality of upstream channels;
said parameters include a channel identification and a mini-slot designation for each communication burst;
said parameters include at least one of power, timing, frequency offset, and equalizer coefficients;
said predetermined schedule is a minimum allocation rate assigned to each modem; and
said step of allocating comprises the step of sending a special message to communicate with a modem and cause a communication burst if the modem is not communicating with said hub at a rate sufficient to meet the minimum allocation rate assigned to the modem.
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Specification