PDCP Packet Cascading for Lossless Handover Overhead Reduction
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Solution Overview
Problem
The existing NR system incurs high packet header overheads and consumes significant hardware resources due to repeated processing at each protocol layer during data transmission, particularly during terminal device handovers, leading to reduced data processing efficiency.
Innovation Solution
A method involving cascading multiple data units into a single data packet for transmission, with optional differentiation through separate or shared tunnels, to reduce header overheads and maintain lossless handover, while adhering to processing capacity limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data packets are processed at each protocol layer (SDAP, PDCP, RLC, MAC, PHY) in sequence during handover, then data transmission reliability is maintained, but packet header overheads increase by about a dozen of bytes and hardware resource consumption increases
Solution Approach 1:
The source base station performs cascading processing on data units before handover to generate a first data packet that includes multiple data units. This preliminary action consolidates multiple protocol layer processing results into a single packet structure, reducing the need for repeated header additions at the target base station while maintaining transmission reliability.
Solution Approach 2:
The patent implements a cascading structure where multiple data units are nested within a single first data packet. The first data packet contains multiple data units that belong to the same radio bearer or quality of service flow, allowing the target base station to process them together without requiring separate header additions for each unit.
2Reliability
If data packets are processed at each protocol layer in sequence during handover, then data transmission reliability is maintained, but data processing efficiency decreases due to increased hardware resource consumption
Solution Approach 1:
The source base station performs cascading processing on data units before handover to generate a first data packet that includes multiple data units. This preliminary action consolidates multiple protocol layer processing results into a single packet structure, reducing the need for repeated header additions at the target base station while maintaining transmission reliability.
Solution Approach 2:
The patent merges multiple data units into a single first data packet through cascading processing. By combining multiple protocol layer processing operations into one consolidated packet, the system reduces the total number of hardware resource operations required at the target base station, thereby improving data processing efficiency while maintaining reliability.
3Loss of substance
If multiple data units are cascaded into a single data packet, then header overheads are reduced and data transmission efficiency is improved, but processing capacity limits must be adhered to
Solution Approach 1:
The system dynamically adjusts the number of data units cascaded into a single first data packet based on processing capacity constraints. By varying the quantity of cascaded data units as a parameter, the system optimizes the balance between reducing header overheads and staying within processing capacity limits of the network devices.
Data Source
AI summary
A data transmission method, an apparatus, and a system. The method includes: a source network device performs cascading processing on at least two data units to obtain a first data packet, where data included in the at least two data units belongs to a same radio bearer or quality of service flow of a terminal device, and the first data packet is a packet data convergence protocol (PDCP) layer data packet or a service data adaptation protocol (SDAP) layer data packet; and sends the first data packet to a target network device through a first tunnel. According to the foregoing method, a plurality of data units is cascaded to obtain one data packet, so that header overheads of the cascaded data packet can be reduced, lossless handover under a cascading function can be implemented, and a cascading gain can be obtained.