Two-Stage DCI Signaling for Multi-Carrier Scheduling
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Solution Overview
Problem
The challenge in wireless communication systems is the inefficiency and overhead associated with scheduling multiple data channels across multiple carriers, particularly in scenarios like dynamic spectrum sharing where PDCCH capacity is limited, leading to potential system performance degradation and increased PDCCH blocking rates.
Innovation Solution
A two-stage DCI format is introduced, where the first stage includes common scheduling information for all carriers and information for decoding the second stage, while the second stage provides specific scheduling details for each carrier, reducing the overall DCI payload size and maintaining PDCCH capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single DCI format is used to schedule multiple data channels on multiple carriers, then scheduling flexibility is maintained, but DCI payload size increases significantly and PDCCH capacity is exceeded
Solution Approach 1:
The DCI format is divided into two stages: first-stage DCI contains common scheduling information applicable to multiple carriers, while second-stage DCI contains carrier-specific scheduling details. This segmentation reduces the payload size of each DCI message while maintaining the ability to schedule multiple carriers flexibly.
Solution Approach 2:
The first-stage DCI format is designed to be universal across multiple carriers by containing common scheduling parameters that apply to all scheduled carriers. This multi-functionality allows a single DCI structure to serve multiple purposes and reduce overall signaling overhead.
2Productivity
If common scheduling information is included for all carriers in a single DCI, then PDCCH capacity is exceeded and blocking rates increase, but scheduling efficiency is reduced
Solution Approach 1:
By segmenting the scheduling information into common (first-stage) and specific (second-stage) components, the patent reduces the payload size transmitted on PDCCH, thereby decreasing PDCCH blocking rates while maintaining scheduling efficiency through the compact first-stage DCI format.
3Quantity of substance
If carrier-specific scheduling information is transmitted separately for each carrier, then PDCCH capacity requirements increase, but DCI payload size per message decreases
Solution Approach 1:
The patent merges common scheduling information from multiple carriers into a single first-stage DCI message, reducing the number of separate PDCCH messages required. This combining approach decreases overall PDCCH capacity requirements while maintaining individual carrier scheduling capability through the second-stage DCI.
Data Source
AI summary
Embodiments of the present disclosure relate to DCI format transmissions. According to some embodiments of the disclosure, a method may include: receiving a first DCI format scheduling a first data channel of a plurality of data channels on a first carrier of a plurality of carriers, wherein the first DCI format includes common scheduling information for all of the plurality of carriers and information for decoding a second DCI format; receiving the first data channel on the first carrier based on the first DCI format; decoding the second DCI format on the first data channel; and receiving a second data channel of the plurality of data channels on a second carrier of the plurality of carriers based on the second DCI format.