Multi-PxSCH Scheduling Across Unlicensed COTs for Lower UE Power
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently scheduling multiple transmissions while reducing power consumption and maintaining accurate signal transmission and reception in user equipment devices, which can strain battery life.
Innovation Solution
A base station transmits first downlink control information (DCI) over an unlicensed spectrum during a first channel occupancy time (COT) to schedule multiple shared channel communications, including physical uplink and downlink shared channels, and acknowledgment messages, allowing for cross-COT scheduling to optimize resource utilization and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate DCI transmissions are used to schedule each shared channel transmission, then scheduling flexibility and reliability are improved, but control overhead and power consumption increase
Solution Approach 1:
The patent combines multiple scheduling decisions into a single DCI transmission that schedules multiple PDSCH transmissions across different COTs. This merging reduces the number of separate DCI messages needed, thereby reducing control overhead and power consumption while maintaining scheduling reliability through the consolidated scheduling information.
Solution Approach 2:
The DCI structure is designed to serve multiple functions simultaneously: it schedules multiple PDSCH transmissions, indicates different COT configurations, and provides resource allocation information for multiple transmissions. This multi-functionality reduces the need for separate control messages and improves overall system efficiency.
2Adaptability or versatility
If multiple separate DCI transmissions are used to schedule each shared channel transmission, then scheduling flexibility is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent merges multiple scheduling operations into a single DCI message that can schedule multiple PDSCH transmissions. This consolidation reduces the number of separate processing operations needed at the UE, thereby reducing device complexity and processing overhead while preserving scheduling flexibility through the unified control structure.
Solution Approach 2:
The DCI includes parameters that indicate the number of COTs, time domain resource allocations for each COT, and other scheduling information that enables flexible scheduling of multiple transmissions. By carefully designing these parameters, the system achieves adaptability without requiring complex processing logic.
3Productivity
If single DCI schedules multiple transmissions across different COTs, then resource utilization efficiency is improved, but scheduling complexity and coordination requirements increase
Solution Approach 1:
The patent merges multiple resource allocation decisions into a single DCI transmission that efficiently schedules resources across multiple COTs. This approach improves resource utilization by coordinating transmissions in advance, while the structured DCI format manages scheduling complexity through standardized parameter fields.
Solution Approach 2:
The gNB performs preliminary scheduling decisions in a single DCI message that prepares and coordinates multiple future transmissions across different COTs. This preliminary action reduces the need for real-time coordination complexity during actual transmissions, as the scheduling framework is established in advance.
4Loss of energy
If single DCI schedules multiple transmissions, then control overhead is reduced, but measurement precision and scheduling accuracy requirements increase
Solution Approach 1:
The patent combines multiple scheduling allocations into a single DCI message, reducing control overhead and the number of separate control transmissions. To maintain scheduling accuracy, the DCI includes precise time domain resource allocation parameters and COT indication fields that enable accurate interpretation of the merged scheduling information.
Solution Approach 2:
The DCI structure incorporates specific parameters such as COT indication fields, time domain resource allocation indicators, and resource allocation information that provide the necessary precision for accurate scheduling interpretation. These parameter changes ensure that despite the merged structure, scheduling accuracy is maintained through detailed and unambiguous control information.
Data Source
AI summary
A base station (BS) and a user equipment (UE) establish a wireless link. The BS transmits first downlink control information (DCI) to the UE over an unlicensed spectrum during a first channel occupancy time (COT). The first DCI schedules a plurality of shared channel communications, which may be physical uplink shared channel (PUSCH) communications or physical downlink shared channel communication (PDSCH) communications. The first DCI also schedules an acknowledgment message for one or more of the plurality of shared channel communications. The scheduling indicated by the first DCI may include cross-COT scheduling, where one or more communications are scheduled in a second COT or outside of a COT. The UE and the BS perform the plurality of shared channel communications according to scheduling indicated by the first DCI.