| 摘要 |
A Time and Frequency Division (TaFD) scheduler based on a TaFD allocation unit based credit allocation may schedule both time and frequency division for both legacy Data Over Cable Service Interface Specification (DOCSIS) channels and DOCSIS orthogonal frequency division multiple access (OFDMA) channels. In embodiments, scheduling by the TaFD schedules both single carrier quadrature amplitude modulation (SC-QAM) transmissions and OFDMA upstream transmissions. In embodiments, the scheduler schedules based on TaFD allocation unit based credit allocations, where TaFD allocation unit based credits may be allocated for OFDMA overlapped regions. The credits may be dynamically adjusted based on channel utilization and an outstanding bandwidth demand or a prioritized pending bandwidth demand. The TaFD scheduler may use independent hierarchy priority queuing schemes. |
