UE PDCCH Monitoring After DRX Reconfiguration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The LTE standard's DRX operation is ambiguous regarding when a UE should monitor PDCCH after receiving a DRX configuration or reconfiguration message, leading to uncertainty about entering Active Time and using DRX-related timers.
Innovation Solution
The UE monitors PDCCH during an active time period that includes the time from receiving a DRX configuration or reconfiguration message until the first PDCCH indicating a new transmission is received, with the active time also encompassing periods when a scheduling request is sent or pending, and DRX timers are managed accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE does not monitor PDCCH after receiving DRX configuration or reconfiguration message, then battery consumption is reduced, but the UE may miss important control information and fail to properly enter Active Time
Solution Approach 1:
The patent applies preliminary action by defining that the UE should monitor PDCCH during a specific initial period immediately after receiving DRX configuration or reconfiguration messages. This preliminary monitoring period ensures the UE properly enters Active Time and receives necessary control information before transitioning to regular DRX operation, thereby resolving the ambiguity in existing standards about when PDCCH monitoring should commence.
2Reliability
If the UE monitors PDCCH continuously after receiving DRX configuration, then PDCCH monitoring reliability is improved, but battery consumption increases
Solution Approach 1:
The patent applies periodic action by establishing a structured PDCCH monitoring schedule where the UE monitors during the initial period after receiving DRX configuration, then transitions to monitoring only during defined Active Time periods according to DRX cycles. This periodic monitoring pattern ensures reliability during critical setup phases while conserving battery during normal operation, eliminating the need for continuous monitoring.
3Reliability
If the UE enters Active Time immediately after receiving DRX configuration, then PDCCH monitoring is ensured, but the timing synchronization may be ambiguous
Solution Approach 1:
The patent resolves timing synchronization ambiguity by defining a specific preliminary period starting from the receipt of DRX configuration or reconfiguration messages during which the UE must monitor PDCCH. This clearly delimits when Active Time begins, eliminating uncertainty about timing synchronization while ensuring the UE does not miss critical control information during the transition to DRX operation.
Data Source
AI summary
A method and apparatus for a user equipment (UE) operating based on a DRX (Discontinuous Reception) configuration are disclosed. According to these, the UE receives a message including configuration or reconfiguration of DRX; and monitors a PDCCH (Physical Downlink Control Channel) during an active time according to the configuration or reconfiguration of DRX. Here, the active time includes a time period during a PDCCH indicating a new transmission has not been received after receiving the message including configuration or reconfiguration of DRX.