SUL Carrier Selection via Mobility State Adaptation
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Solution Overview
Problem
There is a need for specific implementation solutions to address cell (re)selection and uplink carrier selection in next-generation (5G NR) wireless communication networks when supplementary uplink component carriers (SUL CCs) are deployed, as existing methods lack effective prioritization and configuration strategies.
Innovation Solution
A method for user equipment (UE) to determine whether to select a supplementary uplink (SUL) component carrier based on mobility state, service type, and random access resource configurations, prioritizing cells supporting SUL CCs during cell (re)selection and uplink component carrier decisions, and receiving configurations through downlink control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SUL component carrier is deployed to improve uplink coverage, then uplink coverage and performance are improved, but device complexity and configuration complexity increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting cell selection criteria (S-criteria and R-criteria) based on UE mobility state. The network configures different parameters (q-RxLevMinusSUL, q-QualMinusSUL, TCRmax, NCR_H, NCR_M) according to mobility states (normal, medium, high), allowing the system to adapt uplink carrier selection parameters to match current operational conditions, thereby improving uplink coverage without requiring complex static configurations
Solution Approach 2:
The patent implements dynamics by making the cell reselection behavior adaptive to UE mobility state. The UE determines its mobility state based on cell reselection frequency and adjusts its uplink carrier selection accordingly. The network can update mobility state parameters dynamically through system information or dedicated signaling, enabling the system to respond to changing conditions without increasing configuration complexity
2Productivity
If SUL prioritization is applied during cell reselection, then uplink performance is improved, but processing complexity and decision-making complexity increase
Solution Approach 1:
The patent simplifies processing complexity by using parameter-based decision rules rather than complex algorithms. The UE compares its mobility state against configured thresholds (TCRmax, NCR_M, NCR_H) and applies predetermined parameter adjustments (q-RxLevMinusSUL offsets, TCRmax values) based on the matched mobility state. This parameter-matching approach reduces processing complexity while maintaining uplink performance improvements
Solution Approach 2:
The patent applies self-service by enabling the UE to autonomously determine its own mobility state and select appropriate uplink carriers without requiring complex network control. The UE independently evaluates cell reselection frequency, determines its mobility state, and applies the corresponding SUL prioritization parameters. This self-determination mechanism reduces processing complexity by eliminating the need for complex network-UE coordination protocols
Data Source
AI summary
A method for a user equipment (UE) is disclosed. The method includes determining, by the UE, whether to select a supplementary uplink (SUL) component carrier for building or resuming a radio resource control (RRC) connection with a serving cell during at least one of: a cell selection procedure, having a cell selection or reselection procedure; or a UL/SUL component carrier decision procedure, where the determination of whether to select the SUL component carrier is based at least in part on a mobility state of the UE.