Communication Node MAC SDU Multiplexing for Lower Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication protocols face challenges with large transmission latency and low transmission rates in diverse and complex communication scenarios, necessitating enhancements to improve latency and increase transmission rates.
Innovation Solution
The proposed solution involves multiplexing PDUs from different radio bearers within a single MAC SDU, allowing for improved transmission performance by processing PDUs at various protocol layers, including the SDAP sublayer and MAC sublayer, and enabling cooperation between base stations and terminals in scenarios like non-terrestrial networks, V2X, and IAB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If existing protocols deliver one PDCP data packet through one PDCP entity to one RLC entity with one-to-one mapping, then protocol simplicity is maintained, but transmission latency increases and transmission rate decreases
Solution Approach 1:
The patent merges multiple PDCP PDUs from different radio bearers into a single MAC SDU, and further merges multiple MAC PDUs into a single physical layer transport block. This multi-level merging approach reduces the number of transmission units and protocol processing steps, directly reducing transmission latency while maintaining manageable protocol complexity through structured consolidation.
Solution Approach 2:
The patent creates a universal MAC SDU structure that can carry PDCP PDUs from multiple different radio bearers simultaneously. This multi-functional MAC SDU serves as a common container for diverse data streams, enabling efficient multiplexing and reducing per-packet overhead, thereby decreasing transmission latency without requiring separate protocol handling for each bearer.
2Productivity
If existing protocols use separate MAC PDUs for each PDCP PDU, then protocol simplicity is maintained, but transmission rate decreases
Solution Approach 1:
The patent combines multiple MAC PDUs into a single physical layer transport block, creating a hierarchical structure where MAC PDUs are multiplexed within MAC SDUs, which are then combined into larger transport blocks. This merging increases the amount of data transmitted per protocol unit, directly improving transmission rate while maintaining protocol structure through standardized merging rules.
Solution Approach 2:
The patent implements a nested protocol structure where PDCP PDUs are nested within MAC SDUs, which are nested within physical layer transport blocks. This nested organization allows multiple data units to be contained within larger units, increasing transmission efficiency and rate while maintaining clear protocol boundaries and processing rules at each level.
3Loss of time
If separate protocol processing is used for each PDCP PDU, then processing simplicity is maintained, but transmission latency increases
Solution Approach 1:
The patent merges the processing of multiple PDCP PDUs into a single MAC SDU processing operation. Instead of processing each PDCP PDU separately through individual protocol layers, the merged approach processes consolidated data units, reducing the number of processing steps and associated latency while maintaining protocol integrity through structured processing rules.
Data Source
Figure 1~3
Figure 4~6
Figure 7~11
AI summary
Disclosed in the present application are a method and apparatus used in a communication node for wireless communication. A communication node operates a first MAC PDU on a first cell, wherein the operation is reception, or the operation is transmission; the first MAC PDU comprises a first MAC subPDU, the first MAC subPDU comprises a first MAC subheader and a first MAC SDU; the first MAC SDU comprises at least some bits of a first PDU and at least some bits of a second PDU; the first PDU and the second PDU belong to the same protocol layer, or the first PDU and the second PDU belong to different radio bearers. The technical solution of the present application can improve transmission performance.