Control Information Combining for Wireless Signal Reliability
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Solution Overview
Problem
Wireless communication systems face challenges in ensuring reliable decoding of control information, particularly for user equipment (UE) with poor channel conditions, as existing methods struggle to enhance the likelihood of successful reception and decoding of control transmissions.
Innovation Solution
The proposed solution involves combining multiple instances of control information at the UE by identifying optimal time and frequency locations for transmission based on parameters such as identification parameters, index values, frequency parameters, and multiplexing patterns, allowing the UE to generate a combined signal for decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple instances of control information are transmitted in different time and frequency locations, then the reliability of receiving control information is improved, but the device complexity and processing requirements increase
Solution Approach 1:
The patent combines multiple instances of control information (same RMSI scheduling information) transmitted in different time and frequency locations by performing signal combining operations at the UE. The UE identifies multiple search candidates across different monitoring occasions, combines their corresponding CCEs, and attempts to decode the combined signal, thereby improving reception reliability through signal aggregation.
Solution Approach 2:
The patent segments the control information transmission into multiple instances distributed across different time locations (monitoring occasions) and frequency locations (CORESETs). Each instance is transmitted independently in a separate CCE, allowing the UE to receive and combine these segmented instances to reconstruct the complete control information.
2Reliability
If multiple search candidates are monitored in the search space, then the likelihood of successful decoding is improved, but the processing time and energy consumption increase
Solution Approach 1:
The patent performs preliminary identification of monitoring occasions and search candidates before actual decoding. The UE identifies the set of monitoring occasions available for RMSI scheduling information and determines time and frequency locations based on parameters associated with monitoring occasions, preparing the combining operation in advance to reduce overall processing time.
Solution Approach 2:
The patent merges multiple control information instances from different search candidates into a single combined signal for decoding. By combining signals from multiple CCEs before decoding, the UE improves the likelihood of successful decoding while reducing the number of separate decoding attempts required.
3Adaptability or versatility
If multiple instances of control information are transmitted with different time and frequency locations, then the adaptability to channel conditions is improved, but the system complexity increases
Solution Approach 1:
The patent implements dynamic adaptation to channel conditions by transmitting control information instances across multiple time and frequency locations with different characteristics. The UE adapts its receiving strategy by identifying monitoring occasions based on parameters such as identification parameters, index values, frequency parameters, and multiplexing patterns, allowing flexible adaptation to varying channel conditions.
Solution Approach 2:
The patent changes transmission parameters including time locations (monitoring occasions), frequency locations (CORESETs), and multiplexing patterns to create diverse instances of control information. These parameter variations allow the system to adapt to different channel conditions while the UE uses identified parameters to locate and combine the appropriate instances.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described for transmissions of multiple instances of control information, such as remaining minimum system information (RMSI) that may be used for system access by a user equipment (UE). The multiple instances of the control information may be transmitted in a number of monitoring occasions that may be monitored by a UE, and within the monitoring occasions, the control information may be transmitted using different time locations, frequency locations, or combinations thereof. The locations may be identified based at least in part on one or more parameters associated with at least a first monitoring occasion. The one or more parameters may include an identification parameter associated with the base station or monitoring occasion, an index value associated with the monitoring occasion, a frequency parameter associated with the monitoring occasion, a control information multiplexing pattern, or any combination thereof.