Downlink Control Information Segmentation for Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in transmitting data with high reliability and low latency, particularly due to increased data traffic and the need for enhanced mobile communication systems that support high transmission rates, numerous connections, and energy efficiency.
Innovation Solution
A method for receiving downlink data in a wireless communication system involves configuring a higher layer parameter set for control information, receiving a first downlink control information (DCI) indicating scheduling grants, and transmitting data based on the indicated higher layer parameter set, with options for simplified DCI formats and energy detection for reliable resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DCI formats are used for scheduling control information, then comprehensive control functionality is maintained, but DCI signaling overhead increases and processing complexity increases
Solution Approach 1:
The patent segments DCI into two parts: a first DCI with a first DCI format containing essential scheduling information, and a second DCI with a second DCI format containing additional control information. This segmentation allows the system to reduce overhead for basic scheduling while maintaining comprehensive control functionality when needed, directly addressing the contradiction between reliability and signaling overhead.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary portion of control information through the first DCI format for basic scheduling scenarios. The second DCI format is transmitted only when additional control functionality is required, thereby reducing average DCI signaling overhead while maintaining the capability for comprehensive control when needed.
2Reliability
If comprehensive control information is transmitted in DCI, then scheduling flexibility is maintained, but latency increases due to larger message sizes
Solution Approach 1:
By segmenting DCI into first and second DCI formats with different information densities, the system can transmit essential scheduling information quickly through the compact first DCI format, reducing processing time and latency. The second DCI format is used only when additional control information is necessary, thereby minimizing average processing time while maintaining scheduling flexibility.
Solution Approach 2:
The system transmits only the essential portion of control information in the first DCI format for time-critical scheduling, reducing message size and processing time. Additional control information is transmitted in the second DCI format only when required, thereby minimizing latency while preserving scheduling flexibility for complex scenarios.
3Adaptability or versatility
If multiple higher layer parameter sets are configured, then scheduling adaptability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the configuration of higher layer parameter sets by associating different DCI formats with different parameter sets. The first DCI format is associated with a first higher layer parameter set for basic scheduling, while the second DCI format is associated with a second higher layer parameter set for advanced scheduling. This segmentation allows the system to maintain multiple parameter sets for adaptability while managing complexity through structured association.
Solution Approach 2:
The patent creates a universal framework where DCI formats and higher layer parameter sets are systematically associated through multiple possible relationships. This multi-functional association mechanism allows a single DCI structure to support multiple parameter sets and scheduling scenarios, thereby improving scheduling adaptability while avoiding the need for separate management mechanisms for each parameter set combination.
Data Source
AI summary
Disclosed herein is a method for receiving downlink data in a wireless communication system which includes: receiving configuration of a higher layer parameter set for at least a part of control information for receiving the downlink data from an eNB; receiving first downlink control information (DCI) including only an indicator indicating whether to grant scheduling for the higher layer parameter set; and receiving the downlink data on the basis of control information indicated by the higher layer parameter set, when the first DCI indicates a grant of scheduling for the higher layer parameter set.