초록 ▼

A method for changing the data rate over an interleaved latency path overcomes shortfalls of the ADSL2 seamless rate adaptation (SRA) and dynamic rate repartitioning (DRR). The interleaver depth is allowed to change during either a rate charge or rate repartioning so that the interleaver delay is co

A method for changing the data rate over an interleaved latency path overcomes shortfalls of the ADSL2 seamless rate adaptation (SRA) and dynamic rate repartitioning (DRR). The interleaver depth is allowed to change during either a rate charge or rate repartioning so that the interleaver delay is constant before and after the change. The transmitter pauses its transmission for a time approximately equal to the delay of the interleaver so that there are approximately no errors introduced at the receiver.

대표청구항 ▼

What is claimed is: 1. A method for data transmission rate change for a digital subscriber line (DSL) transmission, comprising: reading out an interleaver without writing complete codewords; changing seamlessly the interleaver depth on an interleaved data path while transmitting a data stream with

What is claimed is: 1. A method for data transmission rate change for a digital subscriber line (DSL) transmission, comprising: reading out an interleaver without writing complete codewords; changing seamlessly the interleaver depth on an interleaved data path while transmitting a data stream with the changed interleaver depth; coordinating a transmitter and a receiver by switching bits per frame; and discarding invalid data at the receiver after changing the interleaver depth. 2. The method of claim 1, wherein an end-to-end delay between said receiver and said transmitter is maintained approximately constant before and after the rate change. 3. The method of claim 1, further comprising: providing a break in the data stream, wherein the break has a length approximately equal to a delay of the interleaver. 4. The method of claim 1, changing an end-to-end delay before and after the rate change to effect a change in an impulse noise protection. 5. The method of claim 1, wherein the changing the interleaver depth comprises draining the interleaver by continuing to reading data out of the interleaver while not adding new data to the interleaver before the change in interleaver depth. 6. The method of claim 5, wherein the draining the interleaver comprises inserting at least (D-1)*(I-1) octets in the data transmission to drain the interleaver, wherein D is an initial interleaver depth and I is an initial interleaver length. 7. The method of claim 6, wherein the inserting comprises draining the interleaver and ending on a codeword boundary by inserting D-1 complete codewords. 8. The method of claim 7, wherein changing the interleaver depth is immediately done after a plurality of complete codewords are inserted. 9. The method of claim 7, further comprising: switching to a new number of bits per DMT frame on a next frame boundary after the complete codewords are inserted. 10. The method of claim 1, wherein the discarding comprises discarding the invalid data after waiting exactly (D-1)*(I-1) octets until a deinterleaver is primed, wherein D is a new interleaver depth and I is a new interleaver length. 11. The method of claim 1, wherein the changing comprises maintaining an approximately constant end-to-end delay before and after the rate change. 12. The method of claim 1, wherein the changing comprises increasing or decreasing the impulse noise protection.