Uplink Control Information CRC Masking for LTE Reliability
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Solution Overview
Problem
The transmission of uplink control information in wireless communication systems, such as 3GPP LTE, faces challenges due to restrictive radio resources and potential transmission errors, which can degrade service quality, especially when channel state information (CSI) and hybrid automatic repeat request (HARQ) acknowledgments (ACK/NACK) are involved.
Innovation Solution
A method and apparatus for transmitting uplink control information by masking the cyclic redundancy check (CRC) of first uplink control information with a masking sequence related to second uplink control information, specifically using a processor to mask the CRC of CSI with a masking sequence related to HARQ ACK/NACK, and transmitting the masked information through an uplink channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink control information is transmitted using conventional methods, then the transmission process is simple, but transmission reliability is low due to restrictive radio resources and potential transmission errors
Solution Approach 1:
The patent applies preliminary action by masking the CRC of first uplink control information with a masking sequence related to second uplink control information before transmission. This pre-processing step ensures that even if transmission errors occur, the receiver can reliably identify and separate different types of control information, thereby improving transmission reliability without adding complex real-time processing requirements
Solution Approach 2:
The masking sequence acts as an intermediary element that connects and differentiates between first and second uplink control information. By introducing this intermediate masking layer, the system enables reliable distinction between different control information types (such as CSI and HARQ-ACK) shared on the same physical uplink channel, resolving the reliability issue without requiring separate dedicated channels for each control information type
2Productivity
If multiple types of uplink control information are transmitted on the same physical channel, then radio resource utilization is improved, but transmission errors may occur due to resource restrictions
Solution Approach 1:
The patent applies segmentation by dividing uplink control information into different types (first UCI and second UCI) and applying distinct masking sequences to each type. This segmentation allows multiple control information types to be simultaneously transmitted on the same physical uplink channel while maintaining the ability to separately identify and process each type, thereby improving resource utilization without sacrificing reliability
Solution Approach 2:
The patent applies local quality by assigning different masking sequences specifically to different types of control information based on their local characteristics. The masking sequence is tailored to the specific control information type it protects, enabling the receiver to locally identify and correctly process each control information type even when multiple types share the same transmission channel
Data Source
AI summary
A method for transmitting uplink control information and a wireless device are provided. The wireless device masks the cyclic redundancy check (CRC) of a first piece of uplink control information with a masking sequence related to a second piece uplink control information and transmits the masked first piece of uplink control information to an uplink channel.