Method and apparatus for allocating upstream channel resource in hybrid fiber coaxial network
First Claim
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1. A method of allocating upstream channel resources by using a cable modem termination system (CMTS) in a hybrid fiber coaxial (HFC) network, the method comprising:
- defining a plurality of burst profiles based on an upstream channel status, the plurality of burst profiles being defined based on a previously measured upstream channel status that is previously measured in an extended burst profile mode,wherein each of the plurality of burst profiles define physical layer parameters for transmitting packets, and wherein the plurality of burst profiles include burst profiles of fixed IUC values in industry standard versions and burst profiles of additional extended IUC values, wherein the burst profiles of the additional extended IUC values are used in the extended burst profile mode;
transmitting the defined plurality of burst profiles to each of a plurality of cable modems (CMs);
receiving, from each of the CMs, an upstream message including information of whether the extended burst profile mode, in which a CM uses the additional extended IUC values, is supported by the CM;
monitoring the upstream channel status of each CM; and
allocating resources to each of the CMs by using burst profiles corresponding to the upstream channel status from among the plurality of burst profiles and the information of whether the CM supports the extended burst profile mode,wherein allocating a burst profile to each of the CMs comprises;
transmitting a MAP message used to allocate the burst profiles to CMs, the MAP message comprising a plurality of information elements (IEs) each having an IUC field comprising one of a plurality of IUC codes corresponding respectively to the plurality of burst profiles,wherein the IUC codes include a predetermined IUC value for indicating that extended IUC values follow, and when the IUC field includes the predetermined IUC value, an offset field corresponding to the IUC field indicates the number of IEs having an extended IUC value and the IUC values of subsequent IEs are determined as extended IUC values.
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Abstract
A method and apparatus for allocating upstream channel resources in a hybrid fiber coaxial (HFC) network are provided. A cable modem termination system (CMTS) previously provides cable modems (CMs) with a plurality of burst profiles through an extended interval usage code (IUC) of an upstream channel descriptor (UCD) message, and allocates resources to CMs by using an optimized burst profile according to an upstream channel status, thereby increasing transmission efficiency of an upstream channel.
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Citations
22 Claims
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1. A method of allocating upstream channel resources by using a cable modem termination system (CMTS) in a hybrid fiber coaxial (HFC) network, the method comprising:
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defining a plurality of burst profiles based on an upstream channel status, the plurality of burst profiles being defined based on a previously measured upstream channel status that is previously measured in an extended burst profile mode, wherein each of the plurality of burst profiles define physical layer parameters for transmitting packets, and wherein the plurality of burst profiles include burst profiles of fixed IUC values in industry standard versions and burst profiles of additional extended IUC values, wherein the burst profiles of the additional extended IUC values are used in the extended burst profile mode; transmitting the defined plurality of burst profiles to each of a plurality of cable modems (CMs); receiving, from each of the CMs, an upstream message including information of whether the extended burst profile mode, in which a CM uses the additional extended IUC values, is supported by the CM; monitoring the upstream channel status of each CM; and allocating resources to each of the CMs by using burst profiles corresponding to the upstream channel status from among the plurality of burst profiles and the information of whether the CM supports the extended burst profile mode, wherein allocating a burst profile to each of the CMs comprises; transmitting a MAP message used to allocate the burst profiles to CMs, the MAP message comprising a plurality of information elements (IEs) each having an IUC field comprising one of a plurality of IUC codes corresponding respectively to the plurality of burst profiles, wherein the IUC codes include a predetermined IUC value for indicating that extended IUC values follow, and when the IUC field includes the predetermined IUC value, an offset field corresponding to the IUC field indicates the number of IEs having an extended IUC value and the IUC values of subsequent IEs are determined as extended IUC values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of receiving upstream channel resources in a CM in a HFC network, the method comprising:
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receiving a plurality of burst profiles defined based on an upstream channel status from a CMTS, wherein each of the plurality of burst profiles define physical layer parameters for transmitting packets, and wherein the plurality of profiles include burst profiles of fixed IUC values in industry standard versions and burst profiles of additional extended IUC values used in an extended burst profile mode; informing the CMTS of whether the CM supports all the plurality of burst profiles by transmitting, to the CMTS, an upstream message including information of whether the extended burst profile mode, in which a CM uses the additional extended IUC values, is supported by the CM; transmitting a resource request message to the CMTS; and receiving resources from the CMTS by using the plurality of burst profiles determined according to whether the CM supports all the plurality of burst profiles and defined based on the upstream channel status, wherein when the CM supports all the received plurality of burst profiles, receiving resources by using burst profiles corresponding to the upstream channel status among the plurality of burst profiles; and when the CM does not support the additional extended IUC values, receiving resources by using burst profiles corresponding to the upstream status among burst profiles corresponding to the fixed IUC values supported by the CM defined based on the upstream channel status, wherein the burst profile assigned to the CM not supporting the additional extended IUC values is assigned according to an upstream channel performance value and a version of the CM, wherein receiving resources comprises; receiving a MAP message used to allocate the burst profiles to CMs, the MAP message comprising a plurality of information elements (IEs) each having an IUC field comprising one of a plurality of IUC codes corresponding respectively to the plurality of burst profiles, wherein the IUC codes include a predetermined IUC value for indicating that extended IUC values follow, and when the IUC field includes the predetermined IUC value, an offset field corresponding to the IUC field indicates the number of IEs having an extended IUC value and the IUC values of subsequent IEs are determined as extended IUC values. - View Dependent Claims (11, 12, 13)
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14. An apparatus for allocating upstream channel resources in a HFC network, the apparatus comprising:
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a burst profile establishing unit defining a plurality of burst profiles based on an upstream channel status such that each of the plurality of burst profiles define physical layer parameters for transmitting packets and the plurality of burst profiles include burst profiles of fixed IUC values in industry standard versions and burst profiles of additional extended IUC values used in an extended burst profile mode, transmitting the defined plurality of burst profiles to each of a plurality of CMs, and receiving an upstream message including information of whether the extended burst profile mode, in which a CM uses the additional extended IUC values, is supported from each of the CMs, wherein the plurality of burst profiles are defined based on a previously measured upstream channel status that is previously measured in an extended burst profile mode; a monitoring unit monitoring the upstream channel status of each CM; and a resource allocating unit allocating resources to each of the CMs by using burst profiles corresponding to the upstream channel status from among the plurality of burst profiles and the information of whether the CM supports the extended burst profile mode, wherein the resource allocating unit allocates a burst profile to each of the CMs by transmitting a MAP message used to allocate the burst profiles to CMs, the MAP message comprising a plurality of information elements (IEs) each having an IUC field comprising one of a plurality of IUC codes corresponding respectively to the plurality of burst profiles, wherein the IUC codes include a predetermined IUC value for indicating that extended IUC values follow, and when the IUC field includes the predetermined IUC value, an offset field corresponding to the IUC field indicates the number of IEs having an extended IUC value and the IUC values of subsequent IEs are determined as extended IUC values. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A method of allocating upstream channel resources by using a cable modem termination system (CMTS) in a hybrid fiber coaxial (HFC) network, the method comprising:
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defining a plurality of burst profiles based on an upstream channel status, the plurality of burst profiles being defined based on a previously measured upstream channel status that is previously measured in an extended burst profile mode; transmitting the defined plurality of burst profiles to each of a plurality of cable modems (CMs); receiving an upstream message including information of whether an extended burst profile mode is supported from each of the CMs; monitoring the upstream channel status of each CM; and allocating resources to each of the CMs by using burst profiles corresponding to the upstream channel status from among the plurality of burst profiles and the information of whether the CM supports the extended burst profile mode, wherein allocating a burst profile to each of the CMs comprises; transmitting a MAP message used to allocate the burst profiles to CMs, the MAP message comprising a plurality of information elements (lEs) each having an IUC field comprising one of a plurality of IUC codes corresponding respectively to the plurality of burst profiles, wherein the IUC codes include a predetermined IUC value for indicating that extended IUC values follow, and when the IUC field includes the predetermined IUC value, an offset field corresponding to the IUC field indicates the number of IEs having an extended IUC value and the IUC values of subsequent IEs are determined as extended IUC values.
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Specification