Single DCI Bandwidth Part Indication for Multi-Cell Scheduling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently scheduling communications across multiple cells using a single downlink control information (DCI) message, leading to potential misinterpretation of bandwidth part indications and increased latency, reduced reliability, and spectral inefficiency.
Innovation Solution
The method involves using a single DCI message to indicate multiple bandwidth parts for multiple cells, where the number of bits in the bandwidth part indicator field is determined based on the number of bandwidth parts configured for each cell, allowing for accurate interpretation and scheduling of communications across cells, including the use of modulo operations to handle excess bandwidth part indicator values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a single DCI message is used to schedule communications on multiple cells, then signaling overhead is reduced, but bandwidth part indication interpretation becomes ambiguous and error-prone
Solution Approach 1:
The patent applies local quality by making the bandwidth part indicator field cell-specific rather than universal. Each cell is configured with its own bandwidth part indicator value in the single DCI message, allowing the indication to be interpreted correctly in the context of each specific cell's bandwidth part configuration. This resolves the ambiguity that would otherwise arise from using a single unified indicator across multiple cells with different configurations.
Solution Approach 2:
The patent segments the bandwidth part indication by allocating separate indicator fields or values within the single DCI message for each scheduled cell. This segmentation allows each cell's bandwidth part to be independently identified and interpreted, preventing misinterpretation while maintaining the overhead benefits of single-message scheduling.
2Device complexity
If bandwidth part indicator field uses fixed number of bits, then message structure is simple, but it cannot accommodate varying numbers of bandwidth parts across different cells
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the number of bits in the bandwidth part indicator field to vary based on the specific cell's configuration. Each cell can have a different number of bandwidth parts configured, and the DCI message structure adapts to accommodate this variability through cell-specific indicator field lengths or values, rather than using a fixed uniform structure for all cells.
Solution Approach 2:
The patent changes the parameter of indicator field bit length dynamically based on the number of bandwidth parts configured for each cell. This allows the system to optimize the message structure for each cell's specific needs, using fewer bits when fewer bandwidth parts are configured and more bits when more bandwidth parts are needed, thereby achieving both simplicity and flexibility.
3Measurement precision
If multiple DCI messages are used to schedule each cell individually, then bandwidth part indication is accurate, but latency increases and spectral efficiency decreases
Solution Approach 1:
The patent merges the scheduling of multiple cells into a single DCI message while maintaining accurate bandwidth part indication for each cell. By combining multiple cell schedules into one message with cell-specific bandwidth part indicators, the system achieves both the spectral efficiency benefits of reduced messaging and the accuracy of individualized bandwidth part specification for each cell.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a single downlink control information (DCI) message that schedules communications on multiple cells, wherein the single DCI message indicates multiple bandwidth parts, corresponding to the multiple cells, on which the communications are scheduled; and communicate using the multiple bandwidth parts corresponding to the multiple cells, wherein the communicating comprises: transmitting the communications in the multiple bandwidth parts corresponding to the multiple cells, or receiving the communications in the multiple bandwidth parts corresponding to the multiple cells. Numerous other aspects are provided.