Packet Retransmission
Embodiments disclosed herein include systems and methods of packet retransmission. More specifically, at least one nonlimiting example of a method includes receiving data from above a γ (gamma) interface, the data being identified as protected or not protected data; and storing the protected fragment in a retransmission queue included in a transport protocol specific transmission convergence layer.
1 . A method, comprising:
receiving data from above a γ (gamma) interface, the data being identified as protected or not protected data;
fragmenting the data into protected and unprotected fragments with a fragment component configured to receive protected and unprotected data;
storing the protected fragment in a retransmission queue included in a transport protocol specific transmission convergence layer;
transmitting the protected and non-protected fragments across an α/β (alpha/beta) interface to a physical medium specific transmission convergence layer; and
in response to an indication for retransmission of a fragment, the indication coming from a physical medium specific transmission convergence layer, determining whether the fragment is protected, locating the fragment in the retransmission queue, and retransmitting the protected fragment across an α/β interface to a physical medium specific transmission convergence layer.
2 . The method of claim 1 , wherein all fragments are protected.
3 . The method of claim 1 , further comprising receiving the indication for retransmission of the fragment, the indication being received from a retransmission control channel.
4 . The method of claim 1 , wherein the indication for retransmission coming from a physical medium specific transmission convergence (PMS-TC) layer is associated with PMS-TC error detection blocks that are not necessarily aligned with fragments; and wherein a transport protocol specific-transmission convergence (TPS-TC) layer includes a retransmission control block that maps PMS-TC error detection blocks with the corresponding fragments in the retransmission queue and takes the decision to retransmit fragments corresponding to PMS-TC error detection blocks identified as incorrectly received by the far-end receiver device.
5 . The method of claim 4 , wherein each PMS-TC error detection block is formed of at least one FEC codewords.
6 . The method of claim 1 , wherein the retransmission control block is synchronized with the PMS-TC layer via a FEC codeword counter that is synchronized with a corresponding FEC codeword counter in the far-end receiver.
7 . A method, comprising:
receiving data at a physical medium specific transmission convergence layer, and determining whether there is any error in the received data;
in response to a determination that the data includes at least one error, determining whether the error can be corrected with a forward error correction decoder and,
in response to a determination that the error cannot be corrected with the forward error correction decoder, constructing an indication to a far-end transmitter device for retransmitting at least a portion of the data received in error; and
in response to determination that the data includes no error or the error can be corrected with the forward error correction decoder, the data is sent across an α/β (alpha/beta) interface for rescheduling in a transport protocol specific transmission convergence layer.
8 . The method of claim 7 , wherein an error in the received data is determined when at least one FEC codeword has at least one error.
9 . The method of claim 7 , wherein the indication for retransmitting at least a portion of the data sent to a far-end transmitter includes a count of received FEC codewords, and an indication of whether the FEC codewords were received correctly or incorrectly.
10 . The method of claim 7 , wherein the indication for retransmitting at least a portion of the data received in error is sent to the far-end transmitter in each of a plurality of discrete multitone (DMT) symbol frames.
11 . The method of claim 7 , wherein not-protected data sent across the α/β interface is sent across the gamma interface, without being sent to the rescheduling queue.
12 . A system, comprising:
a retransmission and transport protocol specific-transmission convergence (TPS-TC) layer configured to receive data from above a γ (gamma) interface, the data being identified as protected or not protected data;
a fragment component in the retransmission and TPS-TC layer configured to fragment the data into protected and unprotected fragments with a fragment component configured to receive protected and unprotected data;
a retransmission queue in the retransmission and TPS-TC layer configured to store the protected fragment in a retransmission queue included in a transport protocol specific transmission convergence layer;
a TPS-TC component in the retransmission and TPS-TC layer configured to transmit the protected and non-protected fragments across an α/β (alpha/beta) interface to a physical medium specific transmission convergence (PMS-TC) layer; and
a retransmission control component in the retransmission and TPS-TC layer configured to, in response to an indication for retransmission of a fragment coming from a physical medium specific transmission convergence layer:
determine whether the fragment is protected;
locate the fragment in the retransmission queue; and
retransmit the protected fragment across the α/β (alpha/beta) interface to the PMS-TC layer.
13 . The system of claim 12 , wherein all fragments are protected.
14 . The system of claim 12 , wherein the indication for retransmission of a fragment comes from the PMS-TC layer.
15 . The system of claim 14 , wherein the indication for retransmission coming from the PMS-TC layer is associated with PMS-TC error detection blocks that are not necessarily aligned with fragments; and wherein a transport protocol specific-transmission convergence (TPS-TC) layer includes a retransmission control block that maps PMS-TC error detection blocks with the corresponding fragments in the retransmission queue and takes the decision to retransmit fragments corresponding to PMS-TC error detection blocks identified as incorrectly received by the far-end receiver device.
16 . The system of claim 15 , wherein each PMS-TC error detection block is formed of at least one FEC codewords.
17 . The system of claim 15 , further comprising a forward error correction (FEC) codeword counter configured to synchronize the retransmission control block with the PMS-TC layer, the FEC codeword counter being synchronized with a corresponding FEC codeword counter in the far-end receiver.
18 . The system of claim 12 , wherein the indication for retransmitting a fragment includes a count of received FEC codewords and an indication of whether the FEC codewords were received correctly or incorrectly.
19 . The system of claim 12 , wherein the indication of retransmitting the fragment is received in each of a plurality of discrete multitone (DMT) symbol frames.
20 . The system of claim 12 , further comprising a retransmission control channel configured to send the indication for retransmission to the retransmission control component.