Control Information DCI Alignment for Low-Power BWP Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication technologies face challenges in managing power consumption and efficient bandwidth part switching in terminal devices with varying capabilities, particularly in scenarios with diverse terminal types and forms, such as industrial automation and home environments.
Innovation Solution
Aligning the sizes of downlink control information (DCI) in specific and common search spaces to reduce the number of types of DCI sizes detected by terminal devices, enabling efficient bandwidth part switching and frequency domain diversity gain, especially for REDCAP terminals with narrow bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device detects control information in multiple search spaces with different DCI sizes, then the terminal can receive comprehensive control information, but the power consumption increases due to multiple detection operations
Solution Approach 1:
The patent merges the detection of DCI in the first search space and first common search space into a single detection operation by aligning their sizes. The terminal device performs one detection operation that can identify DCI from either search space, eliminating the need for separate detection operations and thereby reducing power consumption while maintaining comprehensive control information reception.
Solution Approach 2:
The aligned DCI size enables a single detection operation to serve multiple functions: detecting DCI in the first search space, detecting DCI in the first common search space, and identifying the type of DCI (first type or second type). This multi-functional detection operation reduces the overall number of detection operations required, lowering power consumption while maintaining reliable control information reception.
2Reliability
If the terminal device performs multiple blind detection operations for different DCI sizes, then all control information can be detected, but the detection time and processing load increase
Solution Approach 1:
The patent combines multiple blind detection operations into a single operation by ensuring that DCI in the first search space and first common search space have the same size. The terminal device performs one blind detection operation that can identify DCI from either search space, reducing detection time and processing load while maintaining detection completeness.
Solution Approach 2:
The patent employs preliminary action by using a first indicator bit to pre-identify the type of DCI (first type or second type) before full decoding. This preliminary identification allows the terminal device to optimize subsequent processing based on the DCI type, reducing overall detection time while ensuring all control information is detected.
3Reliability
If the terminal device uses fixed bandwidth part configuration, then the device structure is simple, but the frequency domain diversity gain is not fully utilized
Solution Approach 1:
The patent introduces dynamic bandwidth part switching capability, allowing the terminal device to switch between different bandwidth parts (first bandwidth part and second bandwidth part) based on transmission conditions. This dynamic switching enables full utilization of frequency domain diversity gain to improve data transmission reliability, while the switching mechanism is triggered by DCI indicators that manage the complexity.
Solution Approach 2:
The patent changes the bandwidth part parameter dynamically based on transmission conditions. The terminal device can switch between different bandwidth parts (first bandwidth part with first bandwidth and second bandwidth part with second bandwidth) to optimize frequency domain diversity. This parameter change approach improves reliability while managing complexity through DCI-based control.
Data Source
AI summary
The technology of this application provides a control information transmission method, so that sizes of different downlink control information (DCI) can be aligned, thereby reducing types of DCI sizes and reducing power consumption when a terminal detects DCI. The method includes a terminal device detecting first DCI in a first search space, where the first DCI is used to indicate an active bandwidth part (BWP) of the terminal device, a size of the first DCI and a size of second DCI are aligned, the second DCI can be sent by a network device to the terminal device in a first common search space, and the second DCI is used to schedule a system message, a paging message, or a random access response (RAR).