Cross-Carrier Scheduling With Coordinated DRX Timers Across Groups
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Solution Overview
Problem
Existing DRX procedures in wireless communications systems face ambiguity in cross-carrier scheduling for different DRX groups, leading to inefficiencies and increased power consumption due to independent DRX active times across carriers in various frequency bands.
Innovation Solution
Implement cross-carrier scheduling techniques that adjust DRX timers and monitoring based on the DRX state of associated groups, allowing control information reception and transmission to align with the active times of different DRX groups, thereby optimizing power consumption and network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent DRX active times are used across carriers in different frequency bands, then each carrier can operate autonomously, but power consumption increases and network efficiency decreases
Solution Approach 1:
The patent combines multiple independent DRX groups into a unified cross-carrier DRX framework where a single DRX configuration coordinates timing across multiple carriers. This merging reduces the number of separate DRX active times, allowing the UE to enter sleep mode more frequently and reducing overall power consumption while maintaining autonomous operation capabilities.
Solution Approach 2:
The patent creates a universal DRX configuration that serves multiple carriers simultaneously through cross-carrier scheduling. A single DRX group configuration can manage timing for multiple carriers, making the DRX mechanism multi-functional and reducing the need for separate DRX configurations for each carrier, thereby reducing power consumption.
2Adaptability or versatility
If independent DRX active times are used across carriers in different frequency bands, then each carrier can operate autonomously, but network efficiency decreases
Solution Approach 1:
By merging multiple DRX groups into a coordinated cross-carrier DRX system, the patent ensures that DRX active times are synchronized across carriers. This coordination improves network efficiency by reducing redundant wake-ups and ensuring that scheduling operations occur at optimal times across all carriers, while still allowing each carrier to maintain its autonomous operation characteristics.
3Adaptability or versatility
If cross-carrier scheduling is implemented with multiple DRX groups, then scheduling flexibility is improved, but ambiguity in DRX timer management increases
Solution Approach 1:
The patent segments the DRX management by introducing distinct DRX group configurations (first DRX group and second DRX group) with separate timer parameters. This segmentation allows independent timer management for different carrier groups, reducing ambiguity by clearly defining which timers apply to which carriers, while still maintaining cross-carrier scheduling flexibility.
Solution Approach 2:
The patent introduces a cross-carrier scheduling configuration as an intermediary layer that coordinates between multiple DRX groups. This intermediary clearly defines the relationships and timer adjustments needed when scheduling across carriers with different DRX configurations, reducing management ambiguity by providing explicit rules for timer behavior in cross-carrier scenarios.
4Speed
If DRX timers are adjusted based on control information reception, then network responsiveness is improved, but complexity in timer coordination across carriers increases
Solution Approach 1:
The patent segments timer coordination by creating separate DRX groups with group-specific timer configurations. When control information is received on a specific carrier, only the relevant DRX group timers are adjusted according to clear rules, rather than coordinating all timers across all carriers. This segmentation improves responsiveness by allowing targeted timer adjustments while reducing overall coordination complexity.
Solution Approach 2:
The patent applies local quality by allowing different timer adjustment behaviors for different DRX groups based on where control information is received. Each DRX group can have customized timer coordination rules tailored to its specific carriers, enabling responsive local adjustments without requiring complex global timer coordination across all carriers.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described, in which a communication device (e.g., a user equipment (UE), a network entity) may perform carrier aggregation, and cross-carrier scheduling provides that a first carrier may provide scheduling information for one or more other carriers, in which the one or more other carriers may have different discontinuous reception (DRX) configurations than the first carrier. One or more DRX-related timers of different DRX groups may be started or restarted based on a control information reception on the first carrier, or on a different carrier of a different DRX group. Additionally, or alternatively, control information transmissions on the first carrier may be provided based on one or more DRX-related timers that are associated with the first carrier, or that are associated with a carrier of another DRX group than the DRX group of the first carrier, or any combinations thereof.