Multi-bit Scheduling Request Grouping for Uplink Resource Efficiency
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing scheduling requests (SRs) for multiple logical channels over a single uplink grant, leading to issues with peak-to-average power ratio (PAPR) and intermodulation distortion, especially when SR resources overlap with other uplink control information (UCI) resources.
Innovation Solution
A user equipment (UE) configures to partition SR opportunities occurring within the same time period into groups and generates a single SR bit representing each group, allowing for the transmission of SR bits within the allocated resources or appended to UCI, thereby avoiding frequency division multiplexing and reducing PAPR issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple SR opportunities are transmitted using frequency division multiplexing to represent multiple logical channels, then the scheduling entity can distinguish which logical channel has data, but the peak-to-average power ratio increases and intermodulation distortion occurs
Solution Approach 1:
The patent merges multiple SR opportunities into a single SR transmission by combining multiple SR bits (each representing a different logical channel) into one unified SR message. This single SR is transmitted on a single uplink resource rather than using multiple frequency-multiplexed resources, thereby eliminating PAPR and intermodulation distortion while still conveying information about multiple logical channels through the combined bit structure
2Ease of manufacture
If SR resources are allocated semi-statically for each logical channel, then resource allocation is simplified, but resource utilization efficiency decreases when multiple SR opportunities overlap in time
Solution Approach 1:
The patent segments the SR transmission approach by dividing SR opportunities into groups corresponding to different logical channels, where each SR bit represents a specific logical channel. This segmentation allows the system to maintain simple semi-static resource allocation while improving efficiency by allowing multiple SR bits to be transmitted together in a single uplink grant, rather than requiring separate resources for each logical channel
Solution Approach 2:
The patent creates a universal SR transmission mechanism where a single uplink grant can carry multiple SR bits representing multiple logical channels. This multi-functional approach allows the same resource allocation structure to serve multiple logical channels simultaneously, improving resource utilization efficiency while maintaining the simplicity of semi-static allocation
Data Source
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AI summary
Aspects of the present disclosure provide mechanisms for utilizing a single uplink grant to transmit scheduling requests (SRs) for two or more logical channels. A base station may allocate a separate grant of uplink resources for each SR opportunity (e.g., each logical channel for which a user equipment (UE) may transmit a SR to the base station). When the allocated uplink resources are within the same time period, the UE may select a subset of the SR opportunities for which to transmit a SR and partition the subset into one or more groups of SR opportunities. The UE may then generate one or more SR bits representing the one or more groups of SR opportunities and transmit the one or more SR bits on the single uplink grant.