Aligning the Upstream DMT Symbols of Multiple Lines in a TDD DSL System

摘要

Time-division duplex (TDD) transmission in a digital subscriber line (DSL) communication system including a group of DSL transceivers at a remote side (FTU-Rs) and a distribution point unit (DPU) by performing, with a second FTU-R among the group of FTU-Rs, an initial upstream symbol alignment for a first FTU-R, where a first gap time the first FTU-R needs to wait before transmitting first upstream symbols to a first DSL transceiver at an operator side (FTU-O) at the DPU in a TDD frame period is acquired to make the first upstream symbols align at the first FTU-O's interface, transmitting second upstream symbols to the first FTU-O to correct the first gap time after performing the initial upstream symbol alignment, receiving, from the first FTU-O, tuning offset information representing a correction for the first gap time, and tuning the first FTU-R's upstream symbols transmit time according to the tuning offset information received.

主权项

1. A method for time-division duplex (TDD) transmission in a digital subscriber line (DSL) communication system comprising a group of DSL transceivers at a remote side (FTU-Rs) and a distribution point unit (DPU), comprising:
performing, with a second FTU-R among the group of FTU-Rs, an initial upstream symbol alignment for a first FTU-R, wherein a first gap time that the first FTU-R needs to wait before transmitting first upstream symbols to a first DSL transceiver at an operator side (FTU-O) at the DPU in a TDD frame period is acquired to make the first upstream symbols align at the first FTU-O's interface; transmitting second upstream symbols to the first FTU-O to correct the first gap time after performing the initial upstream symbol alignment; receiving, from the first FTU-O, tuning offset information representing a correction for the first gap time; andtuning the first FTU-R's upstream symbols transmit time according to the tuning offset information received.