Group-Scrambled Common Downlink Control Information for 5G Terminals
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Solution Overview
Problem
The existing methods for transmitting and acquiring common downlink control information in 5G systems are not applicable to scenarios where multiple terminal groups exist in a cell, as they do not account for the varying common downlink control information required for different terminal groups.
Innovation Solution
The method involves grouping common downlink control information using preset group-scrambling information, such as radio network temporary identifiers (RNTIs) or scrambling sequences, to create grouped common downlink control information, which is then transmitted to terminals for demodulation, allowing each terminal to acquire the target common downlink control information specific to its group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If common downlink control information is transmitted using a single unified method for all terminals, then the transmission method is simple and easy to implement, but it cannot accommodate different terminal groups that require different common downlink control information
Solution Approach 1:
The patent segments the cell into multiple terminal groups, where each group is assigned dedicated common downlink control information. The base station transmits multiple sets of common downlink control information, each scrambled with group-specific RNTIs, allowing different terminal groups to receive and process only their relevant control information, thereby achieving adaptability to different terminal groups while maintaining manageable complexity through structured segmentation
Solution Approach 2:
The patent applies local quality by assigning different scrambling identities (RNTIs) to different terminal groups, so that each group receives common downlink control information with specific local characteristics tailored to its needs. This allows the system to provide customized control information for each terminal group while using a unified transmission framework, balancing adaptability and complexity
2Adaptability or versatility
If multiple sets of common downlink control information are transmitted for different terminal groups, then the adaptability to different terminal groups is improved, but the complexity of the transmission and acquisition method increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring terminal groups with their designated RNTIs before transmission. Terminals are pre-informed about which RNTI corresponds to their group, allowing them to directly demodulate the appropriate common downlink control information without needing to search or identify it during reception, thereby maintaining ease of operation despite transmitting multiple sets of control information
Solution Approach 2:
The patent uses RNTIs as intermediaries between the base station and terminal groups. Each RNTI acts as a unique identifier that mediates the connection between specific terminal groups and their corresponding common downlink control information, simplifying the demodulation process by providing a direct mapping relationship that terminals can use to efficiently acquire their designated control information
Data Source
AI summary
A method for transmitting and acquiring common downlink control information includes: common downlink control information is group-scrambled with pieces of preset group-scrambling information corresponding to terminal groups one by one to acquire grouped common downlink control information; and transmitting a physical downlink control channel (PDCCH) carrying target common downlink control information to a terminal, so that the terminal demodulates the PDCCH according to the pieces of the preset group-scrambling information to acquire the target common downlink control information, where the target common downlink control information is common downlink control information corresponding to a target terminal group to which the terminal belongs in the grouped common downlink control information.