Network-Coded PDU Evaluation Using Success Release Timers
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Solution Overview
Problem
3GPP radio protocols lack support for Network Coding (NC) protocols, which complicates the evaluation of successful transmission of protocol data units (PDUs), as they rely on a one-to-one mapping between PDCP SDUs and PDUs, necessitating retransmissions based on status reports.
Innovation Solution
Implementing NC protocols in 3GPP radio protocols by associating PDUs with NC processes, using success and stuck timers, and determining PDU management based on sequence numbers and timers to facilitate successful decoding and release of PDUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NC protocol is implemented in 3GPP radio protocols, then transmission efficiency is improved by enabling successful decoding of PDUs, but device complexity increases due to the need for NC process management including timers and sequence number tracking
Solution Approach 1:
The patent segments the NC process management into distinct functional components: success release timer for tracking successful decodings, stuck timer for detecting transmission stalls, and sequence number-based PDU association. This segmentation allows each component to handle specific aspects of NC management independently, improving overall system organization and manageability while enabling efficient transmission through coordinated operation of these segmented functions.
2Reliability
If PDCP status reports are used for retransmission in 3GPP radio protocols, then transmission reliability is maintained, but loss of time occurs due to the one-to-one mapping requirement and subsequent retransmission delays
Solution Approach 1:
The patent applies preliminary action by implementing success release timer and stuck timer mechanisms that proactively manage PDU transmission status before actual retransmission is needed. The success release timer pre-determines when successfully decoded PDUs should be released from buffering, while the stuck timer proactively detects transmission stalls and triggers appropriate actions. This preliminary timing-based management eliminates the need for time-consuming status report exchanges and retransmission delays inherent in traditional one-to-one PDCP mapping.
3Adaptability or versatility
If NC process buffers multiple PDUs for potential decoding, then transmission flexibility is improved, but loss of substance occurs as buffered PDUs may be discarded when success release timer expires
Solution Approach 1:
The patent implements feedback mechanisms where the success release timer continuously monitors the status of buffered PDUs and provides feedback on which PDUs have been successfully decoded and are ready for release. The stuck timer also provides feedback when transmission stalls are detected, triggering retransmission or alternative actions. This continuous feedback loop ensures that PDUs are only discarded when genuinely unnecessary (after successful decoding and timeout), maintaining transmission flexibility while minimizing data loss through informed decision-making.
Data Source
AI summary
Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for managing a NC process. In certain representative embodiments, a wireless transmit/receive unit (WTRU) may receive a Network Coding (NC) configuration from a network. The WTRU may receive a first protocol data unit (PDU) of a NC PDU set. The WTRU may associate the first PDU with a NC process based on header information. The NC process may successfully decode using the first PDU. The WTRU may receive a second PDU of the NC PDU set. The WTRU may discard the second PDU based on the second PDU being received within a NC process success release time duration from a time of the successful decoding of the NC process. The WTRU may release the NC process based on lapsing of the NC process success release time duration from a time of the successful decoding of the NC process.