Asynchronous Uplink Transmission for Out-of-Sync Terminals
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Solution Overview
Problem
Current communication systems face high uplink data transmission latency and signaling overheads when a terminal and a base station are in an out-of-synchronization state, particularly due to the need for establishing an RRC connection and performing random access processes.
Innovation Solution
The method involves obtaining and using asynchronous transmission parameter information, including physical resource information, modulation, and coding scheme information, to configure an asynchronous transmission frame with a frame header, data transmission portion, and frame tail, allowing the terminal to send uplink information without timing advance, thereby enabling data transmission without establishing an RRC connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs random access process and establishes RRC connection to send uplink data, then the uplink data can be transmitted reliably, but the transmission latency and signaling overhead increase significantly
Solution Approach 1:
The patent segments the traditional uplink transmission process by introducing a separate asynchronous uplink resource allocation mechanism independent of the RRC connection establishment. This allows data transmission to occur in parallel with connection setup, dividing the previously sequential process into concurrent operations that reduce overall latency while maintaining reliability through separate confirmation channels.
Solution Approach 2:
The patent implements preliminary action by pre-configuring asynchronous uplink resources and allowing terminals to transmit data before RRC connection is fully established. The base station pre-allocates resources and the terminal can immediately send data without waiting for the complete connection setup, thereby reducing transmission latency while the connection establishment proceeds in the background.
2Ease of operation
If the terminal performs random access process and establishes RRC connection to send uplink data, then the uplink data can be transmitted with proper resource allocation, but the signaling overhead increases
Solution Approach 1:
The patent extracts the resource allocation signaling from the mandatory RRC connection establishment sequence by introducing a separate asynchronous resource indication mechanism. This extracted signaling path provides essential resource allocation information independently, reducing the burden on the main connection establishment signaling and overall overhead while maintaining proper resource management.
Solution Approach 2:
The patent creates a universal asynchronous resource allocation mechanism that can serve multiple purposes: initial data transmission, uplink synchronization maintenance, and fallback communication. This multi-functional resource allocation system reduces the need for separate dedicated signaling paths for each function, thereby reducing overall signaling overhead while maintaining ease of operation.
3Reliability
If the terminal uses timing advance for uplink transmission, then the uplink signals are synchronized at the base station, but the terminal must be in synchronized state which limits flexibility
Solution Approach 1:
The patent introduces dynamics by allowing the terminal to switch between synchronized and asynchronous transmission modes depending on the operational context. The system dynamically adjusts the timing reference - using timing advance when synchronized and ignoring it for asynchronous transmissions - thereby maintaining adaptability and flexibility while ensuring synchronization reliability when needed.
Data Source
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AI summary
A method, a terminal, and a base station for asynchronous uplink transmission are provided, to reduce an uplink data transmission latency and signaling overheads when a terminal and a base station are in out-of-synchronization state. The method includes: obtaining asynchronous transmission parameter information that is the same as that of a base station, where asynchronous transmission parameter information includes physical resource information, modulation and coding scheme information, and physical resource frame format information, and the physical resource frame format information includes length information of a physical resource frame; determining a length of an asynchronous transmission frame according to the physical resource frame format information; and sending first uplink information to the base station according to the asynchronous transmission parameter information by using the asynchronous transmission frame. Because the asynchronous transmission parameter information obtained by a terminal is the same as that of the base station, the length of the asynchronous transmission frame that is determined by the terminal is the same as that determined by the base station. Therefore, even though in out-of-synchronization state, the base station can still receive the first uplink information, implementing uplink transmission on data. In this way, an uplink data transmission latency and signaling overheads are reduced.