DU-CU Wireless Architecture for UL/DL-Centric Traffic
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Solution Overview
Problem
Existing wireless data networks struggle to optimize processing for both uplink-centric and downlink-centric user applications simultaneously, especially with the advent of 5G technologies like enhanced Mobile Broadband, massive Machine Type Communications, and Ultra-Reliable Low-Latency Communications, where asymmetry on the uplink and downlink is exacerbated.
Innovation Solution
A dynamic wireless network architecture that separates and optimizes the processing of uplink and downlink data using Distributed Unit (DU) and Centralized Unit (CU) circuitry, where DU and CU process user data with distinct sets of functions tailored to the centricity of the user applications, utilizing PHY, MAC, RLC, PDCP, and RRC protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If network slicing and UL/DL de-coupling are implemented to optimize for specific applications, then performance for targeted applications is improved, but the system cannot simultaneously optimize for both UL-centric and DL-centric applications
Solution Approach 1:
The patent segments the processing functions into two distinct paths: a first set of functions for UL-centric applications and a second set of functions for DL-centric applications. This segmentation allows each path to be optimized independently for its specific application type, resolving the contradiction between optimization and versatility.
Solution Approach 2:
The patent implements dynamic function selection where the DU circuitry determines which set of functions to apply based on the incoming data's characteristics. This dynamic adaptation allows the system to switch between optimization modes, simultaneously supporting both UL-centric and DL-centric applications through time-multiplexed function selection.
2Device complexity
If a single processing path is used for all applications, then system complexity is reduced, but performance optimization for asymmetric applications is lost
Solution Approach 1:
The patent applies local quality by providing different processing functions in different contexts. The first set of functions is specifically tailored for UL-centric applications while the second set is tailored for DL-centric applications, allowing each local processing path to have the precise characteristics needed for its intended use case.
Solution Approach 2:
The DU circuitry is designed with multi-functionality, capable of executing both the first set of functions and the second set of functions. This universal capability allows a single system to handle diverse application types with different optimization requirements, avoiding the need for separate dedicated systems.
3Ease of operation
If all processing functions are centralized in CU, then coordination is simplified, but processing speed and latency for time-sensitive applications increase
Solution Approach 1:
The patent segments processing functions between DU and CU, with the DU executing time-sensitive functions locally and the CU handling higher-level coordination. This segmentation enables critical processing to occur at the edge (DU) for speed, while centralized coordination (CU) maintains simplified network management.
Solution Approach 2:
The DU acts as an intermediary between the CU and the wireless medium, performing local processing of user data before/after CU involvement. This intermediary role allows time-sensitive operations to be handled locally at DU while still benefiting from CU coordination when needed, balancing speed and ease of operation.
Data Source
AI summary
A wireless data system receives first user data for a first user application. The wireless data system receives second user data for a second user application. The wireless data system processes the first user data with a first set of functions based on the first user application. The wireless data system processes the second user data with a second set of the functions based on the second user application. The functions comprise Physical Layer (PHY), Media Access Control (MAC), Radio Link Control (RLC), Packet Data Convergence Protocol (PDCP), and Radio Resource Control (RRC). The first set of the functions differs from the second set of the functions.