Selective DRX Active Time Adjustment for Carrier Aggregation
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Solution Overview
Problem
The concept of PDCCH monitoring is not adapted to support carrier aggregation in LTE-A, as it becomes complex when multiple component carriers are used, and extending PDCCH monitoring from Rel-8 to carrier aggregation situations is challenging due to resource scheduling across different carriers.
Innovation Solution
A selective discontinuous reception method is proposed for User Equipment (UE) to adjust active times based on whether a component carrier is configured with a Physical Downlink Control Channel (PDCCH) for scheduling resources on itself or other carriers, optimizing active times to avoid missing scheduling data or wasting battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented with multiple component carriers, then data transmission capacity is improved, but PDCCH monitoring complexity increases
Solution Approach 1:
The patent segments the PDCCH monitoring task by identifying which component carriers actually have PDCCH configured versus those that don't. This segmentation allows the UE to focus monitoring efforts only on relevant carriers, reducing overall complexity while maintaining the benefits of carrier aggregation for improved data transmission capacity.
Solution Approach 2:
The patent applies local quality by treating different component carriers differently based on their specific configuration. Some carriers have PDCCH configured while others don't, so the monitoring strategy is localized to only those carriers that require it, optimizing the balance between capacity and complexity.
2Adaptability or versatility
If PDCCH monitoring is extended to carrier aggregation scenarios, then scheduling flexibility is improved, but energy consumption increases
Solution Approach 1:
The patent applies partial action by having the UE monitor PDCCH only on component carriers where it is actually configured, rather than monitoring all carriers uniformly. This partial monitoring approach maintains scheduling flexibility for carriers that need it while reducing unnecessary energy consumption on carriers without PDCCH configuration.
Solution Approach 2:
The patent enables self-service by allowing the UE to autonomously determine which carriers require PDCCH monitoring based on their configuration. The UE uses higher layer signaling information to self-identify which component carriers have PDCCH and adjust its monitoring behavior accordingly, optimizing the balance between scheduling flexibility and energy consumption without network intervention.
3Reliability
If active time is extended to cover all component carriers, then data reception reliability is improved, but battery life decreases
Solution Approach 1:
The patent segments the active time management by separately identifying component carriers with and without PDCCH configuration. This segmentation allows the UE to extend active time only when necessary for carriers that have PDCCH, ensuring data reception reliability for those carriers while avoiding unnecessary active time extension for carriers without PDCCH, thereby preserving battery life.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the active time parameter based on the specific configuration of each component carrier. The UE modifies its active time behavior according to whether PDCCH is configured on each carrier, optimizing the balance between maintaining reliability for carriers that need it and conserving battery life by reducing active time for carriers where it is not required.
Data Source
AI summary
Selective DRX method on multiple CCs for a UE (320), at least one CC being configured with a PDCCH received from a base station (310) and arranged for scheduling resources on a physical shared channel to the UE on said at least one CC respectively and/or on at least one other CC, each CC having a respective active time during which the UE monitors or would monitor the reception of a PDCCH on said CC respectively if said CC is or was configured with a PDCCH. It is determined whether at least one CC is configured with a PDCCH arranged for scheduling resources on at least one other CC. If it is, the active time of said at least one CC is adjusted to the longest active time of said at least one CC and said at least one other CC. Otherwise, independent active times are maintained for all CCs respectively.