Measurement Gap Handling in Wireless User Equipment
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing measurement gaps, which can lead to conflicts with other processing functions like RACH, HARQ, and TTI bundling, affecting the ability of user equipment to perform inter-frequency and inter-RAT cell measurements.
Innovation Solution
The system processes measurement gaps by receiving a radio resource control assignment for tuning between carrier frequencies, determining scheduling conflicts, and performing medium access control processes according to predefined protocols, allowing user equipment to prioritize or delay measurements based on system requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement gaps are assigned to user equipment for tuning to target carrier frequency, then inter-frequency and inter-RAT cell measurements can be performed, but scheduling conflicts arise with other processing functions like RACH, HARQ, and TTI bundling
Solution Approach 1:
The patent implements dynamic handling of measurement gaps by allowing the system to adaptively adjust measurement gap configurations based on current scheduling conditions. When scheduling conflicts are detected with critical functions like RACH or HARQ, the system can modify measurement gap timing or duration, or temporarily suspend measurements, ensuring that mobility measurements are performed when they do not compromise other essential communication functions.
Solution Approach 2:
The patent applies preliminary action by detecting potential scheduling conflicts between measurement gaps and other processing functions in advance. The system evaluates upcoming measurement gap assignments against scheduled RACH procedures, HARQ acknowledgments, and TTI bundling configurations before finalizing the measurement gap schedule, allowing proactive resolution of conflicts rather than reactive handling.
2Measurement precision
If user equipment tunes receiver to target carrier frequency during measurement gap, then inter-frequency measurements are enabled, but data transmission and reception on serving carrier frequency are interrupted
Solution Approach 1:
The patent implements periodic measurement gaps with optimized timing and duration. By carefully selecting the period and length of measurement gaps, the system enables inter-frequency measurements to be performed periodically while minimizing the total time that data transmission is interrupted. The measurement gap configuration is adjusted based on measurement requirements and traffic conditions to achieve an optimal balance between measurement accuracy and data transmission continuity.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting measurement gap parameters such as gap duration, gap periodicity, and gap timing based on current system conditions. When data transmission requirements are high, the system may reduce measurement gap duration or increase gap periodicity, thereby reducing transmission interruptions while still achieving necessary measurement objectives.
3Measurement precision
If measurement gaps are frequently assigned to ensure accurate cell measurements, then mobility performance improves, but system resource utilization decreases due to repeated transmission interruptions
Solution Approach 1:
The patent implements dynamic measurement gap configuration that adapts to current system conditions and traffic patterns. Rather than using fixed frequent measurement gaps, the system adjusts gap frequency, duration, and timing based on real-time requirements for measurement accuracy and system resource utilization. This dynamic approach ensures that measurements are performed with sufficient frequency to maintain mobility performance while minimizing unnecessary interruptions to data transmission and optimizing overall system efficiency.
Data Source
AI summary
In a wireless communication system, user equipment (UE) is provided, one or more set of rules are provided for the UE to handle the processing during a measurement gap. In some aspects, the gap measurement may be ignored. In some aspects, the processing is stored and handled at a later in time and gap measurements are performed. Depending on the system, the measurements performed during the gaps may be UE implementation dependent, wherein the UE determines whether to perform the measurement for a given gap. In some instances, the UE may not perform measurements during the gap, thereby giving priority to other processing, such as RACH processing. Depending on the type of processing required (DL-SCH, UL-SCH, TTI bundling, RACH or SR), the UE may store requests and process the measurements during the gap or ignore the gap measurement as if there were no gaps.