PDCP Network Coding with Linked Sequence Numbers for Packet Recovery
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing radio resources for reliable data transmission, particularly in scenarios with low power and low data rates, such as IoT and machine-to-machine communication, where network coding techniques are not effectively integrated into the PDCP layer, leading to delays and inefficiencies in packet delivery.
Innovation Solution
Implementing network coding within the PDCP layer by using a dual or single PDCP entity architecture, where original and network coded packets are managed separately, with specific sequence number linking formulas to prioritize and deliver packets efficiently, and incorporating mechanisms to handle errors and delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network coded PDUs are transmitted with separate sequence number spaces, then reconstruction reliability is improved, but device complexity increases
Solution Approach 1:
The patent divides the PDCP entity into separate original PDCP entity and network coded PDCP entity, each maintaining independent sequence number spaces. This segmentation allows reliable tracking of original and coded packets separately, improving reconstruction reliability while managing complexity through functional separation.
Solution Approach 2:
The network coded PDCP entity acts as an intermediary that receives original PDUs, generates network coded PDUs with derived sequence numbers, and transmits them. This intermediary structure enables reliable reconstruction by maintaining the relationship between original and coded packets through sequence number derivation formulas.
2Reliability
If original PDUs are prioritized in scheduling, then transmission reliability is improved, but productivity decreases
Solution Approach 1:
The patent implements prioritized scheduling where original PDUs are scheduled before network coded PDUs. This preliminary action ensures that critical original data is transmitted first, improving transmission reliability, while coded packets serve as supplementary information that can be transmitted later if resources permit.
3Measurement precision
If sequence numbers are derived using formulas, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses mathematical formulas to derive sequence numbers for network coded PDUs based on parameters from original PDUs (e.g., SN_ncPDU = (SN_original + offset) mod N). This parameter-based derivation ensures precise sequence number management while keeping the complexity manageable through standardized mathematical operations.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for network coding are provided. One method may include receiving, at a second packet data convergence protocol (PDCP) entity, one or more original packet data convergence protocol (PDCP) protocol data units (PDUs) from a first PDCP entity for a radio bearer. The method may also include coding, at the second packet data convergence protocol (PDCP) entity, the original packet data convergence protocol (PDCP) protocol data units (PDUs) to produce one or more network coded packet data convergence protocol (PDCP) protocol data units (PDUs).