MCS Recovery via CQI Offset for Wireless Interruptions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication devices configured with shared RF circuitry face disruptions in communication, leading to out-of-sync situations and penalties in downlink capability when switching between wireless technologies, especially during interruptions like long fades or tuning-away scenarios, which affect the accuracy of channel quality feedback and modulation and coding scheme (MCS) allocations.
Innovation Solution
The user equipment (UE) implements a method to recover downlink throughput by generating modified channel quality information with offsets, adjusting MCS allocations based on recent error rates and channel conditions, to ensure accurate MCS selection post-interruption, thereby minimizing penalties and optimizing current channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless device uses shared RF circuitry to communicate using multiple wireless technologies, then the device can provide complementary functionality and continuity between generations, but communication interruptions occur causing out-of-sync situations and penalties to downlink capability
Solution Approach 1:
The UE performs preliminary actions by determining the cause of communication interruption before recovering MCS. The device identifies whether interruption was caused by tune-away or long fade, and prepares appropriate recovery strategies in advance. This preliminary determination enables the UE to select the correct recovery path (CQI offset for tune-away, no offset for long fade), preventing unwarranted penalties to downlink capability.
Solution Approach 2:
The invention implements feedback mechanisms where the UE monitors communication status and provides channel quality information (CQI) to the base station. After interruption, the UE continues to provide CQI feedback with appropriate offsets based on the determined interruption cause, enabling the base station to maintain accurate MCS allocation. This feedback loop ensures the system adapts to current channel conditions rather than penalizing for historical interruptions.
2Measurement precision
If the UE provides channel quality feedback after communication interruption, then the base station can determine appropriate code rate and modulation scheme, but the feedback may be inaccurate leading to unwarranted MCS penalties
Solution Approach 1:
The invention changes the parameter of CQI reporting by introducing conditional offsets based on interruption cause. When tune-away is detected, the UE applies a positive CQI offset (e.g., +1 or +2) to compensate for the expected MCS penalty. When long fade is detected, no offset is applied. This parameter modification ensures the base station receives accurate channel quality information that reflects current conditions rather than penalized historical conditions, enabling correct MCS allocation.
3Productivity
If the UE recovers MCS quickly after interruption, then downlink throughput is optimized, but inaccurate recovery may lead to erroneous MCS selection and communication errors
Solution Approach 1:
The UE performs preliminary determination of the interruption cause immediately upon resuming communication, before MCS recovery is needed. By identifying whether the interruption was due to tune-away or long fade, the UE prepares the appropriate CQI offset strategy in advance. This preliminary action enables rapid MCS recovery with accurate offset application, achieving both fast throughput recovery and precise MCS selection.
Solution Approach 2:
The invention implements continuous feedback of CQI with conditionally applied offsets after interruption. The UE monitors channel conditions and provides updated CQI feedback with appropriate offsets based on the determined interruption cause. This feedback mechanism enables the base station to quickly adjust MCS to optimal values while maintaining accuracy, achieving both fast recovery speed and precise MCS selection.
Data Source
AI summary
Manipulating modulation and coding scheme (MCS) allocation after a communication interruption. A UE device may resume communications with a BS after a communication interruption. Channel quality information may be generated and transmitted to the BS. The channel quality information may be based on channel quality measurements, and may also be based on an offset configured manipulate an MCS allocation by the BS based on determining that the interruption to communication between the UE and the BS has occurred.