Framing scheme and method for digital communication overhead and latency reduction
A data communication framing scheme of a bit stream that is divided among a plurality of discrete physical frames, each physical frame is of a definite number of symbols in duration, each symbol is associated with at least one sub-carrier in a plurality of sub-carriers, the physical frame is partitioned in time into at least an uplink zone and a downlink zone, the data framing scheme comprising a logical frame having a logical frame start position that is offset by a rational number of said symbols from a reference symbol, said reference symbol is selected from said definite number of symbols, wherein said logical frame extends in time to coincide with at least part of the duration of said physical frame and at least part of the duration of another physical frame in said plurality of discrete physical frames.
1. A method for communicating data transmission units (DTUs) between devices, the DTUs containing a bit stream that is divided among a plurality of discrete physical frames, each physical frame is of a definite number of symbols in duration, each symbol is associated with at least one sub-carrier in a plurality of sub-carriers, the physical frame is partitioned in time into at least an uplink zone and a downlink zone, the method comprising the procedures of:
allocating, by at least one of said devices, a media access protocol (MAP) context frame in said bit stream, said MAP context frame having a MAP context frame start position that is offset by an integer number of said symbols from a reference symbol within said physical frame; and
providing a MAP message which relates to said MAP context frame; and determining by said MAP context frame when transmission parameters used by said devices take effect.
2. The method according to claim 1 , further comprising the procedures of:
allocating a logical frame in said bit stream, said logical frame having a logical frame start position that is offset from said reference symbol, said reference symbol is selected from said definite number of symbols; and
synchronizing reception of said DTUs between said devices, according to said logical frame start position;
wherein said logical frame extends in time to coincide with at least part of the duration of said physical frame and at least part of the duration of another physical frame in said plurality of discrete physical frames.
3. The method according to claim 1 , further comprising the procedures of:
allocating an ACK/NACK context frame in said bit stream, said ACK/NACK context frame having an ACK/NACK start position that is offset by a rational number of said symbols from said reference symbol; and
providing an ACK/NACK message for acknowledgement/disacknowledgement of reception of at least part of said bit stream contained at least partly in said physical frame and in a previous said physical frame in among said plurality of discrete physical frames, said ACK/NACK message is associated with at least one respective said ACK/NACK context frame.
4. The method according to claim 1 , further comprising allocating a logical frame in said bit stream, said logical frame having a logical frame start position that is offset from said reference symbol, wherein said MAP message includes at least one reference data type that defines said logical frame start position.
5. A method for communicating data transmission units (DTUs) between devices, the DTUs containing a bit stream that is divided among a plurality of discrete physical frames, each physical frame is of a definite number of symbols in duration, each symbol is associated with at least one sub-carrier in a plurality of sub-carriers, the physical frame is partitioned in time into at least an uplink zone and a downlink zone, the method comprising the procedures of:
allocating, by at least one of said devices, an ACK/NACK context frame in said bit stream, said ACK/NACK context frame having an ACK/NACK start position that is offset by a rational number of said symbols from a reference symbol within said physical frame; and
generating an ACK/NACK message configured for transmission between said devices, said ACK/NACK message for acknowledgement/disacknowledgement of reception of at least part of said bit stream contained in, and associated with, respective said ACK/NACK context frame.
6. The method according to claim 2 , wherein said logical frame facilitates synchronization of data transmission units (DTUs) at a receiver receiving said bit stream.