Uplink Split Bearer Thresholds for SCG Selection in Dual Connectivity
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Solution Overview
Problem
Wireless transmit/receive units (WTRUs) face challenges in efficiently managing secondary cell groups (SCGs) for data transmission due to varying channel conditions and resource availability, leading to suboptimal data routing and potential radio link failures in dual connectivity scenarios.
Innovation Solution
A WTRU is configured to determine eligible data for transmission based on uplink split bearer thresholds and channel conditions, selecting appropriate SCGs for data transmission by comparing Reference Signal Received Power (RSRP) values with configured thresholds, and activating/deactivating SCGs dynamically based on data availability and channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a WTRU transmits data on multiple SCGs simultaneously, then data transmission reliability is improved, but device complexity increases due to multiple MAC entities and coordination requirements
Solution Approach 1:
The patent divides the data transmission function into multiple independent SCGs, each with its own MAC entity. The WTRU segments data packets and transmits them through different SCGs simultaneously, allowing parallel transmission paths that improve reliability while keeping each individual transmission path relatively simple
Solution Approach 2:
The patent combines multiple SCGs into a unified transmission system where data can be routed across multiple cell groups. By merging the resources of multiple SCGs and coordinating their transmission, the system achieves enhanced reliability through diversity while managing complexity through centralized routing decisions
2Productivity
If a WTRU dynamically activates/deactivates SCGs based on channel conditions, then network efficiency is improved, but processing complexity increases due to continuous monitoring and decision-making
Solution Approach 1:
The patent implements dynamic activation and deactivation of SCGs based on real-time channel conditions. The WTRU continuously monitors RSRP values and other channel metrics, dynamically adjusting which SCGs are active for data transmission. This allows the system to adapt to changing network conditions and optimize efficiency while managing processing load through event-triggered updates
Solution Approach 2:
The patent employs feedback mechanisms where the WTRU monitors channel conditions (such as RSRP) and uses this information to make activation/deactivation decisions. The system continuously receives feedback about SCG performance and adjusts its transmission strategy accordingly, improving network efficiency through adaptive behavior while managing complexity through structured feedback loops
3Productivity
If a WTRU selects SCGs based on RSRP threshold comparisons, then data routing optimization is improved, but measurement precision requirements increase
Solution Approach 1:
The patent uses RSRP threshold comparisons as a simplification mechanism. Instead of requiring precise measurement and evaluation of all possible transmission parameters, the system changes the approach by using predefined RSRP thresholds to make binary decisions about SCG selection. This simplifies the measurement requirements while still achieving effective data routing optimization
Data Source
AI summary
A WTRU may perform RLM/RLF on a set of related cell groups. select a SCG on which to report a MCG failure. perform activation procedures by triggering UL transmissions, determine which SCG it can transmit data on with a single UL split threshold, and which SCG it can transmit data on with multiple UL split threshold. and/or determine the split bearer threshold to use when multiple SCGs are configured. A WTRU may receive configuration information regarding SCGs associated with each bearer of multiple bearers. and a RSRP threshold associated with each bearer. A WTRU may determine data associated with a bearer is eligible for transmission based on an UL split bearer threshold, and select a set of SCGs for transmission based on SCG RSRP values and bearer RSRP thresholds. The set of SCGs may comprise one or more SCGs.