Framing mechanism for time-division-duplex OFDM communication systems

摘要

The present disclosure outlines mechanisms, systems, methods, techniques and devices that reposition a RMC symbol in a TDD frame. In one aspect, a method queues data transmission units (DTUs) for transmission in a TDD OFDM communication system, with each of the DTUs occupying a single symbol partially or fully, or multiple symbols, of a series of symbols in a TDD frame. The method also forms a management symbol for transmission in a kth symbol position of the series of symbol positions, k>1. The method further transmits the symbols sequentially in the TDD frame.

主权项

1. A method, comprising:
queuing data transmission units (DTUs) for transmission in a time-division-duplex (TDD) orthogonal frequency-division multiplexing (OFDM) communication system, each of the DTUs occupying a single symbol partially or fully, or multiple symbols, of a series of symbols in either a downstream or an upstream direction in a TDD frame; forming a management symbol containing acknowledgement information for retransmission for transmission in a kth symbol position of the series of symbols, k>1; determining a value of the kth symbol position for the management symbol based on a processing delay time required to process a received DTU and a time to generate the acknowledgement information for retransmission; adjusting the value of the kth symbol position for the management symbol based on changes in various criteria or constraints, the various criteria or constraints including retransmission latency and memory size, wherein the value of k is not unique and is different for the downstream direction and the upstream direction; and transmitting the symbols sequentially in the TDD frame.