Multi-Scheduler WTRU Data Path Coordination
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Solution Overview
Problem
Wireless communication systems face challenges in coordinating low latency communication interfaces for multiple schedulers, leading to inefficiencies in data transmission and reception across different network nodes, particularly in multi-scheduler environments where high latency data links between nodes make coordinated scheduling impractical.
Innovation Solution
Implementing a wireless transmit/receive unit (WTRU) that operates using multiple independently scheduled data paths, each associated with a different network node, allowing for independent scheduling and handling of radio resource control (RRC) connections and security across multiple serving sites, with the ability to activate connections to secondary serving sites based on reconfiguration messages and measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple schedulers are used in different network nodes, then data transmission flexibility and network capacity are improved, but coordination latency and scheduling efficiency deteriorate due to high latency data links between nodes
Solution Approach 1:
The patent segments the scheduling function by introducing separate MAC entities (first MAC entity and second MAC entity) that operate independently at different network nodes. Each MAC entity manages its own scheduling decisions without requiring real-time coordination with the other, thereby eliminating coordination latency while maintaining the benefits of multiple schedulers for increased data transmission capacity.
Solution Approach 2:
The patent introduces an intermediary mechanism through the RRC layer and pre-configured uplink grants that mediate between multiple schedulers. The network node configures the WTRU with multiple uplink grants in advance, allowing the WTRU to autonomously select appropriate grants without real-time scheduler coordination, thus resolving the latency issue while preserving multi-scheduler flexibility.
2Productivity
If coordinated scheduling is implemented between multiple network nodes, then resource allocation efficiency is improved, but system complexity and implementation difficulty worsen due to high latency data links
Solution Approach 1:
The patent divides the scheduling coordination function into separate MAC entities that operate independently. Each MAC entity maintains its own scheduling state and makes scheduling decisions autonomously, eliminating the need for complex inter-node coordination protocols and reducing system complexity while preserving resource allocation efficiency through parallel scheduling operations.
Solution Approach 2:
The patent implements preliminary action by pre-configuring multiple uplink grants at the RRC layer before data transmission begins. This allows the WTRU to have multiple ready-to-use scheduling opportunities without requiring real-time coordination during active transmission, thereby simplifying the scheduling system while maintaining efficient resource allocation.
3Loss of time
If independent scheduling is used for each data path, then latency is reduced and operational efficiency is improved, but control plane management complexity increases across multiple network nodes
Solution Approach 1:
The patent uses the RRC layer as an intermediary that handles control plane management for multiple independent schedulers. The RRC layer configures multiple MAC entities and their associated uplink grants in advance, allowing independent scheduling operations at the MAC layer without requiring complex real-time control plane coordination, thus reducing latency while managing control complexity through the intermediary RRC mechanism.
Data Source
AI summary
Systems and methods are disclosed for a WTRU to operate using multiple schedulers. The WTRU may exchange data with the network over more than one data path, such that each data path may use a radio interface connected to a different network node and each node may be associated with an independent scheduler. For example, a WTRU may establish a RRC connection between the WTRU and a network. The RRC connection may establish a first radio interface between the WTRU and a first serving site of the network and a second radio interface between the WTRU and a second serving site of the network. The RRC connection may be established between the WTRU and the MeNB and a control function may be established between the WTRU and the SCeNB. The WTRU may receive data from the network over the first radio interface or the second radio interface.