Multi-Cell DCI Bit-Field Mapping for Efficient PDCCH Scheduling
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in wireless signal transmission and reception procedures, particularly in handling multi-cell scheduling and downlink control information processing.
Innovation Solution
A method and apparatus for wireless communication systems that involve monitoring a physical downlink control channel (PDCCH) to detect downlink control information (DCI) for multi-cell scheduling, utilizing a single first bit field to determine codepoints for multiple cells, and adjusting codepoint determination based on remaining bits to efficiently manage signal transmission and reception across cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single first bit field is used to provide codepoints for multiple cells, then the downlink control information processing efficiency is improved, but the complexity of codepoint determination for cells with different field sizes increases
Solution Approach 1:
The patent segments the codepoint determination process into two distinct phases: first, determining codepoints for cells based on the maximum field size M; second, adjusting codepoints for cells with smaller field sizes K by excluding at least one bit from the first bit field. This segmentation allows efficient processing while managing complexity through structured approach.
Solution Approach 2:
The patent applies local quality by tailoring the codepoint determination method to each cell's specific field size requirements. For cells with field size K smaller than M, the patent selectively excludes specific bits from the first bit field, creating cell-specific codepoint mappings that adapt to local constraints while maintaining overall system efficiency.
2Adaptability or versatility
If codepoints are determined based on remaining bits excluding at least one bit from the first bit field, then adaptability to different cell configurations is improved, but the difficulty of detecting and measuring configured codepoints increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the relationship between the first bit field and codepoints for each cell before actual signal transmission. The base station determines and configures which bits to exclude for each cell based on their field sizes, so that during reception, the UE can directly map the first bit field values to the correct codepoints without complex real-time calculations.
Solution Approach 2:
The patent implements feedback mechanisms where the base station provides configuration information about the first bit field and codepoint mappings to the UE. This feedback allows the UE to understand which bits correspond to which codepoints for each cell, simplifying the detection process while maintaining adaptability to different cell configurations.
3Device complexity
If a unified first bit field size M is used for all cells, then device complexity is reduced, but loss of information occurs for cells with smaller required field sizes
Solution Approach 1:
The patent applies the extraction principle by selectively removing (excluding) at least one bit from the first bit field for cells with smaller field sizes K. This extraction allows the system to use a unified field size M for simplicity while preventing information loss by carefully selecting which bits to exclude, thereby maintaining the necessary codepoint resolution for each cell.
Data Source
AI summary
A method performed by a user equipment (UE) may comprise: monitoring a PDCCH; and detecting DCI for multiple cell scheduling, wherein the DCI may comprise one first bit field providing, at once, codepoints for cells scheduled together through the DCI, the size “M” of the first bit field may be determined on the basis of a first cell in which the total number of codepoints set in relation to the first bit field is the maximum, and for a second cell related to “K” that is a field size smaller than the size “M” of the first bit field, the codepoint provided by the first bit field may be determined on the basis of remaining bit values excluding at least one bit from the first bit field.