Methods and apparatuses for reframing and retransmission of datagram segments

Abstract

A source device for sending datagrams contained in an aggregated packet structure comprising transport containers each containing one or more datagram segments of the datagram, the source device comprising a feedback processor configured to receive feedback that a transmission of a transport container has failed or a detector unit that detects that a transmission of a transport container will fail; a disassembler unit that disassembles the failed transport container the transmission of which has failed or will fail; a creating unit that creates at least one new transport container from less than all of the failed transport containers without splitting datagrams; and a sending unit that sends sequence information indicating a conversion between a sequence of the transport containers of the failed datagram and a sequence of the transport containers of the new datagram, where the source device is configured to reformat and retransmit datagrams whose transmission has failed.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Application No. 61 / 739,771, filed December 20, 2012, entitled "Methods and Apparatuses for Reframing and Retransmission of Datagram Segments" Submission Date Interest. The entire disclosure of the prior application is considered a part of the disclosure of the present application and is hereby incorporated by reference. Background technique [0003] In current communication systems, datagrams are transmitted from a source to a destination according to a known procedure or protocol, generally part of the so-called Open Systems Interconnection Model (OSI Model). According to the OSI model, higher-level communication datagram segments (often referred to as "service data units" or SDUs) are packaged in transport containers (often referred to as "protocol data units" or PDUs) that are transported through lower layers via the physical medium . In some systems, particularly (but not lim...

AI Technical Summary

Problems solved by technology

[0012] 1. Significant, possibly dramatic increase in packet error rate

[0013] 2. Complicate the communication protocol

[0014] 3. Add a lot of communication overhead, thereby reducing system efficiency

[0015] 4. Ignore the fact that some units, possibly legacy units will not work with the proposed solution

[0016] 5. Veto protocol rules that can cause interoperability issues with legacy units and can lead to confusion as the system approaches system capacity

[0017] 6. Increased waiting time

[0018] 7. Discard all failed aggregation packets at the container, which makes the system completely dependent on the variability of the changing environment and cannot distinguish the type of information or packet size in the failed transmission

[0024] 5. When using A-MSDU aggregation, IEEE 802.11 protocol does not support segmentation mechanism

Furthermore, in 802.11 WLANs, there is no way to encapsulate MSDUs or A-MSDUs that are part of a failed transmission into a different number of MPDUs before retransmission in order to reduce the transmission size and thus the transmission duration of each of the failed MPDUs

Images