Counter Downlink Assignment Index Segmentation for 5G NR
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face challenges in efficiently managing downlink assignment indices (DAIs) for piggyback downlink control information (DCI), leading to increased power consumption and reduced chances of sending multiple DCIs to different UEs, especially on higher frequency bands.
Innovation Solution
The method involves determining and generating counter downlink assignment indices (cDAIs) to be included in both control and data channels, with cDAIs incremented based on the order of cells, allowing for efficient transmission and reception of DCIs across multiple component carriers, thereby optimizing DAI management and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DAI is managed using conventional methods in piggyback DCI, then control channel functionality is maintained, but power consumption increases and the ability to send multiple DCIs to different UEs is reduced
Solution Approach 1:
The patent segments the DAI management by introducing separate counter DAIs (cDAIs) for different cell groups (first cell group and second cell group). Each cDAI independently counts DCIs within its cell group, allowing parallel tracking of multiple DCI assignments across different cells without interference. This segmentation enables the system to maintain multiple DCI transmissions to different UEs while reducing the power consumption associated with DAI management overhead.
2Productivity
If multiple DCIs are transmitted to different UEs on higher frequency bands, then system capacity increases, but power consumption and management complexity increase
Solution Approach 1:
The patent divides the cell aggregation into multiple cell groups, each with its own cDAI counter. This segmentation simplifies the management complexity by localizing the counting function within each cell group rather than requiring a single complex counter to track all cells. The UE can independently track cDAI values for each cell group, reducing the computational complexity and power consumption while enabling support for multiple DCI transmissions to different UEs on higher frequency bands.
Solution Approach 2:
The patent introduces a new dimension to DAI management by adding cell group identification to the existing cell-based indexing. Instead of a flat single-dimensional DAI structure, the system now uses a two-dimensional approach where DCIs are indexed by both cell group and cell within the group. This dimensional expansion allows the system to scale to multiple DCI transmissions while maintaining manageable complexity through hierarchical organization.
3Measurement precision
If cDAI is incremented based on cell order for both control and data channels, then DAI tracking accuracy improves, but the system must handle more complex scheduling scenarios
Solution Approach 1:
The patent segments the DAI tracking function into separate cDAI counters for different cell groups. Each cDAI independently increments based on the order of cells within its group, providing accurate tracking for DCIs in that specific group. This segmentation maintains tracking accuracy by ensuring each counter is dedicated to a specific scope, while the modular structure actually reduces overall complexity compared to a single monolithic counter that would need to handle all cells.
Data Source
AI summary
Certain aspects may be implemented in a method for wireless communication. The method generally includes determining a counter downlink assignment index (cDAI) to be included in each of a plurality of downlink control information (DCI), each of a first subset of the plurality of DCI being on a control channel, and each of a second subset of the plurality of DCI being on a data channel, each of the first subset of the plurality of DCI scheduling one of the data channels, and wherein each of the control channels and the data channels is on a cell of a plurality of cells, the determination of the cDAIs being based on order of the cell, with respect to the plurality of cells, on which each of the cDAIs is to be transmitted; generating and outputting for transmission the control channels and data channels in accordance with the determination.