Wireless Control Information Handling in TDD Cell Configuration
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Solution Overview
Problem
In wireless communication systems, there is a challenge in efficiently transmitting and receiving control information when simultaneous transmission and reception are restricted across multiple cells, particularly due to differences in subframe configurations between primary and secondary cells.
Innovation Solution
The method involves configuring primary and secondary cells within the wireless communication system, where the transmission and reception are restricted based on specific subframe configurations, with the transmission direction of secondary cells defined by either system information blocks or physical downlink control channel configurations, depending on whether they are enhanced interference mitigation and traffic adaptation cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simultaneous transmission and reception are restricted in multiple cells, then interference between cells is reduced, but control information transmission efficiency deteriorates
Solution Approach 1:
The patent segments control information into two types: Type 1 (scheduling related) and Type 2 (non-scheduling related). This segmentation allows different handling strategies for different control information types, enabling Type 1 to be transmitted with higher priority while Type 2 can be restricted during simultaneous transmission conflicts, thus maintaining control information transmission efficiency while reducing interference
Solution Approach 2:
The patent applies different transmission restrictions to different cells based on their roles (PCell vs SCell) and different control information types. Specifically, Type 1 control information is permitted in SCell during simultaneous transmission, while Type 2 is restricted. This localized quality approach ensures critical scheduling information flows while non-critical information is suppressed to reduce interference
2Stability of the object's composition
If transmission direction of SCell is defined by first UL-DL information in SIB, then system information consistency is improved, but adaptability to dynamic traffic conditions deteriorates
Solution Approach 1:
The patent introduces dynamic UL-DL reconfiguration capability for eIMTA cells through second UL-DL configuration information in PDCCH, allowing the system to adapt transmission directions dynamically based on real-time traffic conditions. This dynamic mechanism works in conjunction with the static first UL-DL information from SIB, creating a two-layer configuration system that maintains both consistency and adaptability
3Loss of information
If Type 2 control information is transmitted in SCell during simultaneous transmission, then control information completeness is improved, but signal interference deteriorates
Solution Approach 1:
The patent extracts Type 2 control information from the transmission path during simultaneous transmission scenarios. By explicitly restricting Type 2 control information transmission in SCell when simultaneous transmission occurs, the system removes potential interference sources while preserving critical Type 1 scheduling information, thus reducing signal interference while maintaining essential control information completeness
Data Source
AI summary
The present invention relates to a wireless communication system. Specifically, the present invention provides a method for controlling signal transmission and reception by a terminal in a situation in which simultaneous transmission and reception is restricted, and an apparatus therefor, the method comprising the steps of: configuring a PCell and an SCell; and restricting signal transmission and reception on the SCell in an subframe when the PCell and the SCell have different transmission directions in the subframe, wherein the transmission direction of the SCell is defined according to first UL-DL information in an SIB when the SCell is not an eIMTA cell, and the transmission direction of the SCell is defined according to second UL-DL configuration information in a PDCCH when the SCell is the eIMTA cell.