Uplink Control Information Transmission Without Timing Synchronization
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Solution Overview
Problem
Current wireless communication systems require uplink timing synchronization before transmitting data, which increases latency due to the need for a full random access procedure, especially for time-critical uplink control information like beam failure indications and scheduling requests.
Innovation Solution
The system allocates sync-less uplink resources that allow user equipment to transmit uplink control information without initial synchronization, reducing latency by enabling the transmission of time-critical data without performing a full random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink timing synchronization is performed before transmitting uplink data, then transmission reliability is improved, but uplink latency increases due to the random access procedure
Solution Approach 1:
The patent segments the uplink transmission process into two distinct paths: a synchronization path for normal data transmission and an async path for time-critical control information. This segmentation allows different types of data to use different transmission procedures, enabling UCI to bypass the lengthy random access procedure while maintaining synchronization for other data types.
Solution Approach 2:
The base station performs preliminary configuration by allocating specific async resources and providing async resource configuration information to UEs in advance. This preliminary action enables UEs to immediately transmit time-critical UCI without needing to perform synchronization procedures first, reducing latency while maintaining system control.
2Measurement precision
If a full random access procedure is performed to achieve timing synchronization, then timing accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the timing synchronization requirement from the uplink control information transmission path. By creating a separate async resource allocation mechanism, the system removes the dependency between UCI transmission and the full random access procedure, eliminating unnecessary signaling overhead while preserving timing accuracy requirements for other uplink data.
Solution Approach 2:
The patent applies partial synchronization actions by allocating specific async resources with relaxed timing requirements for UCI transmission. Instead of requiring full timing synchronization for all uplink transmissions, the system applies partial synchronization measures only where necessary, reducing overall signaling overhead while maintaining adequate timing control for critical functions.
3Productivity
If uplink timing synchronization is required before data transmission, then resource allocation efficiency is improved, but transmission speed decreases for time-critical information
Solution Approach 1:
The patent introduces dynamic resource allocation by configuring async resources that can be activated or deactivated based on network conditions and UE requirements. This dynamic approach allows the system to adjust resource allocation efficiency and transmission speed according to the urgency and type of data being transmitted, optimizing both productivity and speed for different scenarios.
Data Source
AI summary
Aspects of the present disclosure provide methods, apparatuses, and embodiments for transmitting time critical uplink (UL) control information (e.g., beam failure indication, buffer status report, and scheduling request) without first obtaining UL timing synchronization with a network. Therefore, UL communication latency may be reduced by removing the signaling overhead involved in performing a full random access procedure to obtain UL synchronization prior to UL transmission.