PDCCH Skipping and Search Space Switching During DRX and BWP Change
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Solution Overview
Problem
UE behaviors related to PDCCH skipping and SSSG switching are undefined and indeterminate in cases where PDCCH monitoring adaptation occurs with procedures such as random access, scheduling request, DRX operation, and active bandwidth part change, leading to inefficiencies in power consumption and synchronization issues between UE and network.
Innovation Solution
Implementing schemes that define UE behaviors by terminating PDCCH monitoring under specific conditions (e.g., pending SR, DRX active time, BWP change) and adapting PDCCH monitoring according to new BWP configurations upon timer expiration, ensuring synchronized UE and network operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH monitoring is performed continuously in DRX ON duration, then the UE can detect data transmissions, but power consumption increases significantly
Solution Approach 1:
The patent implements periodic PDCCH monitoring by introducing DRX cycles with ON and OFF durations. The UE monitors PDCCH only during ON durations and suspends monitoring during OFF durations, transforming continuous monitoring into periodic action. This resolves the contradiction by maintaining data detection capability during active periods while reducing power consumption during inactive periods.
Solution Approach 2:
The patent dynamically adjusts PDCCH monitoring behavior based on traffic conditions and UE state. The network can configure different DRX parameters and the UE adapts its monitoring pattern dynamically. This dynamic approach allows the system to optimize between reliability and power consumption based on actual network conditions and data arrival patterns.
2Use of energy by moving object
If PDCCH monitoring is skipped to save power, then power consumption reduces, but synchronization between UE and network deteriorates
Solution Approach 1:
The patent employs feedback mechanisms where the network sends DCI formats to control UE behavior. The network provides feedback about data availability and monitors UE responses, ensuring synchronization is maintained even when UE skips PDCCH monitoring during OFF durations. This feedback loop resolves the contradiction by coordinating UE power-saving actions with network state awareness.
Solution Approach 2:
The network performs preliminary actions by configuring DRX parameters and notifying UE about upcoming ON durations before the UE needs to monitor. This advance notification allows UE to prepare for monitoring activities and ensures both UE and network are synchronized about when monitoring should occur, preventing synchronization issues during skip periods.
3Use of energy by moving object
If PDCCH skipping is implemented without defined behaviors, then power saving is achieved, but operational reliability in edge cases deteriorates
Solution Approach 1:
The patent defines specific parameters and conditions under which PDCCH skipping should occur and be terminated. By establishing clear parameter thresholds and state conditions (such as SR pending, DRX active time, BWP change), the system maintains operational reliability while enabling power saving. These defined parameters resolve the contradiction by providing deterministic behavior in edge cases.
Solution Approach 2:
The patent segments PDCCH monitoring into distinct phases with clearly defined start and stop conditions. By dividing the monitoring behavior into separate operational modes (monitoring, skipping, terminating skip) with explicit transition criteria, the system ensures reliable operation during power-saving operations. This segmentation provides clear boundaries that prevent indeterminate behavior in edge cases.
4Adaptability or versatility
If multiple procedures (random access, SR, DRX, BWP change) operate simultaneously with PDCCH skipping, then system versatility is improved, but behavior determination complexity increases
Solution Approach 1:
The patent merges the control logic for multiple procedures into a unified PDCCH skipping framework. By integrating random access, SR, DRX, and BWP change procedures under a common set of rules and state machine, the system handles multiple procedures simultaneously without requiring separate complex determination logic for each. This merging reduces overall complexity while maintaining versatility.
Solution Approach 2:
The patent creates a universal PDCCH skipping mechanism that applies across different procedures (random access, SR, DRX, BWP change). A single set of configured parameters and state conditions governs skipping behavior regardless of which procedure is active, making the system versatile while simplifying behavior determination. This universal approach allows one mechanism to handle multiple procedures uniformly.
Data Source
AI summary
Various solutions for enhancements on physical downlink control channel (PDCCH) skipping and search space set group (SSSG) switching are described. An apparatus may detect a downlink control information (DCI) format from a network node of a wireless network. The DCI format indicates a duration for skipping PDCCH monitoring. The apparatus may skip PDCCH monitoring for the duration on an active downlink (DL) bandwidth part (BWP) of a serving cell. The apparatus may terminate skipping PDCCH monitoring in an event that at least one condition is met.