Downlink Control Physical Structure for Reduced Latency Operation
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Solution Overview
Problem
Current 5G NR wireless systems face challenges in reducing latency due to increased control signal overhead and complexity in downlink signaling, particularly in shorter transmission time intervals, which hinders efficient data transmission and resource allocation.
Innovation Solution
The method involves using shortened transmission time intervals and demodulation reference signals to decode control channel candidates, with precoding applied to resource elements, allowing for efficient control channel transmission and resource allocation, even in overlapping resource blocks, thereby reducing latency and control overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If shortened transmission time intervals are used to reduce latency, then data transmission speed is improved, but control signal overhead and complexity increase
Solution Approach 1:
The control channel is divided into multiple control channel candidates within the shortened transmission time interval. Each candidate is associated with different resource element groups, allowing parallel processing and reducing the impact of control overhead on overall system complexity while maintaining high data transmission speed
Solution Approach 2:
The patent extends control channel resource allocation into the frequency domain by using multiple resource element groups. This dimensional expansion allows control information to be distributed across different frequency resources, reducing time-domain overhead complexity while preserving the shortened transmission time interval benefits
2Reliability
If control channel candidates are distributed across multiple resource element groups, then control reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The resource element groups are designed to serve multiple functions: they carry control channel candidates for different aggregation levels and support both downlink control information and uplink grants. This multi-functionality reduces the need for separate dedicated resources, thereby improving reliability without proportionally increasing allocation complexity
Solution Approach 2:
The patent employs configurable parameters such as aggregation levels and resource element group sizes that can be adjusted based on channel conditions and traffic requirements. This flexibility allows the system to optimize control reliability while managing resource allocation complexity through adaptive parameter selection rather than fixed complex structures
Data Source
AI summary
Control channel candidates can be transmitted in at least one shortened transmission time interval in a subframe and set of resource blocks corresponding to control channel candidates in the at least one shortened transmission time interval. A determination can be made about whether at least one resource block of the set of resource blocks at least partially overlaps with a broadcast control channel or signal. A determination can be made about control resource elements for transmission of a control channel candidate based on the determination about whether the at least one resource block of the set of resource blocks at least partially overlaps with the broadcast control channel or signal. The control channel candidate can be transmitted in the at least one shortened transmission time interval according to the determined control resource elements.