Allocating orthogonal frequency-division multiple access (OFDMA) resources in data over cable services interface specification (DOCSIS) networks
First Claim
1. A Cable Modem Termination System (CMTS) comprising:
- a receiver configured to receive a plurality of upstream transmission request messages from a plurality of coaxial units via an electro-optical network, wherein the upstream transmission request messages each request permission to transmit a specified amount of data;
a processor coupled to the receiver and configured to allocate Orthogonal Frequency-Division Multiplexing (OFDM) minislots to each coaxial unit based on the amount of data requested in the associated upstream transmission request message; and
a transmitter coupled to the processor and configured to transmit at least one uplink allocation map (UL-MAP) message to indicate minislot allocations to the coaxial units,wherein all OFDM minislots in an allocation for a first of the coaxial units comprise a common bit loading capacity.
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Accused Products
Abstract
A Cable Modem Termination System (CMTS) comprising a receiver configured to receive a plurality of upstream transmission request messages from a plurality of coaxial units via an electro-optical network, wherein the upstream transmission request messages each request permission to transmit a specified amount of data, a processor coupled to the receiver and configured to allocate Orthogonal Frequency-Division Multiplexing (OFDM) minislots to each coaxial unit based on the amount of data requested in the associated upstream transmission request message, and a transmitter coupled to the processor and configured to transmit at least one Uplink Allocation Map (UL-MAP) message to indicate minislot allocations to the coaxial units.
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Citations
17 Claims
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1. A Cable Modem Termination System (CMTS) comprising:
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a receiver configured to receive a plurality of upstream transmission request messages from a plurality of coaxial units via an electro-optical network, wherein the upstream transmission request messages each request permission to transmit a specified amount of data; a processor coupled to the receiver and configured to allocate Orthogonal Frequency-Division Multiplexing (OFDM) minislots to each coaxial unit based on the amount of data requested in the associated upstream transmission request message; and a transmitter coupled to the processor and configured to transmit at least one uplink allocation map (UL-MAP) message to indicate minislot allocations to the coaxial units, wherein all OFDM minislots in an allocation for a first of the coaxial units comprise a common bit loading capacity. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A Cable Modem (CM) comprising:
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a transmitter configured to transmit an upstream transmission request message toward a Cable Modem Termination System (CMTS) via a Data Over Cable Services Interface Specification (DOCSIS) based electro-optical network, wherein the upstream transmission request message requests permission to transmit a specified amount of data; a receiver configured to receive an Uplink Allocation Map (UL-MAP) message in response the upstream transmission request message, wherein the UL-MAP message indicates an Orthogonal Frequency-Division Multiplexing (OFDM) minislot allocation for transmission across the electro-optical network; and a processor coupled to the transmitter and the receiver and configured to cause the transmitter to transmit the data by employing time and frequency resources indicated by the OFDM minislot allocation, wherein the CM is further configured to transmit the data by employing a plurality of OFDM minislots, and wherein each minislot comprises a common number of active subcarriers. - View Dependent Claims (9, 10, 11)
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12. A method comprising:
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receiving, by a Cable Modem Termination System (CMTS), a Request (REQ) message from a Cable Modem (CM) to request transmission opportunities; transmitting an Upstream Bandwidth Allocation Map message to the CM to allocate bandwidth on an Orthogonal Frequency-Division Multiple Access (OFDMA) upstream channel in units of minislots, wherein the minislots comprise a fixed size specified by a number of symbols a frame combined with a number of data subcarriers per minislot, wherein the minislots comprise a variable bit loading based on a location of each minislot in the frame, and wherein each minislot employs only contiguous subcarriers. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification