Adaptive Scheduling Request Procedure for Zero-Config Logical Channels
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Solution Overview
Problem
In next-generation wireless communication systems, particularly 5G New Radio (NR), there is a need for an adaptive Scheduling Request (SR) procedure for Logical Channels (LCHs) configured with zero SR configuration, as existing methods lead to premature Random Access (RA) procedure triggering and system performance degradation due to the lack of valid Physical Uplink Control Channel (PUCCH) resources.
Innovation Solution
The method involves configuring User Equipment (UE) to trigger an SR procedure for LCHs with zero SR configuration, allowing the procedure to remain pending until cancellation, and implementing an adaptive approach that includes initiating an RA procedure and cancelling selected SR procedures to manage resource allocation effectively, thereby avoiding premature RA triggering and maintaining system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SR procedure is triggered for LCHs with zero SR configuration, then SR operation can be performed, but premature RA procedure triggering occurs and system performance degrades
Solution Approach 1:
The patent implements dynamic SR procedure management by introducing a pending state that allows the SR procedure to be suspended until cancellation conditions are met. This dynamic state transition prevents premature RA procedure triggering while maintaining SR operation capability for LCHs with zero SR configuration.
Solution Approach 2:
The patent applies preliminary action by establishing the pending state before actual SR transmission occurs. The SR procedure is triggered and placed in pending state as a preparatory step, allowing subsequent cancellation control to prevent premature RA triggering while maintaining the ability to perform SR operations when needed.
2Reliability
If SR procedure is placed in pending state, then premature RA triggering is avoided, but additional state management complexity is introduced
Solution Approach 1:
The pending state serves multiple functions simultaneously: it suspends SR procedure execution, prevents premature RA procedure triggering, and maintains the ability to cancel SR procedures under specific conditions. This multi-functionality reduces the need for separate state management mechanisms.
Solution Approach 2:
The patent merges the SR procedure state management with the cancellation control logic. The pending state is integrated with the existing SR configuration and cancellation mechanisms, combining multiple control functions into a unified state management approach that reduces overall system complexity.
3Productivity
If SR procedure is cancelled upon RA triggering, then resource allocation is optimized, but system responsiveness may be reduced
Solution Approach 1:
The patent implements feedback mechanisms that monitor SR procedure status and cancellation conditions. The system responds to feedback signals that indicate when SR procedures should be cancelled (e.g., upon successful RA procedure completion) versus when they should be maintained, optimizing resource allocation while preserving system responsiveness through condition-based control.
Solution Approach 2:
The patent applies dynamic cancellation control where the SR procedure state transitions from pending to cancelled based on real-time system conditions. This dynamic approach allows the system to optimize resource allocation by cancelling SR procedures when RA procedures succeed, while maintaining responsiveness by quickly restoring SR capability when needed through conditional state transitions.
Data Source
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Figure 3A~3B
AI summary
A method performed by a User Equipment (UE) for Scheduling Request, SR, operations includes receiving, from a base station, a Radio Resource Control, RRC, message including an SR configuration that includes a set of Physical Uplink Control Channel, PUCCH, resources configured for a plurality of Bandwidth Parts, BWPs. The UE then triggers an SR procedure for a logical channel in a case that the logical channel satisfies an SR triggering condition and determines whether an active BWP of the UE is configured with a PUCCH resource in the set of PUCCH resources. In a case that the active BWP of the UE is not configured with any PUCCH resource in the set of PUCCH resources, after triggering the SR procedure the UE initiates a Random Access, RA, procedure, and cancels the SR procedure for the logical channel.