RRC Setup Signaling for Satellite Uplink Access Enhancement
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Solution Overview
Problem
Satellite communication systems face significant signal path loss and low uplink transmission performance due to the high movement speed and long signal propagation distance of satellites acting as base stations, hindering stable initial access for user equipment (UE).
Innovation Solution
A communication method involving the exchange of first and second information through RRC connection setup messages to request and indicate uplink data transmission enhancements, utilizing techniques like TBoMS and TB scaling, to improve uplink performance and overcome signal path loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite serves as base station with high movement speed and long signal propagation distance, then communication coverage is expanded, but signal path loss increases and uplink transmission performance deteriorates
Solution Approach 1:
The terminal device performs preliminary capability reporting in the RRC connection setup message before actual data transmission begins. This allows the network device to pre-configure appropriate uplink transmission parameters and resources, ensuring the terminal can overcome signal path loss when data transmission occurs.
Solution Approach 2:
The system dynamically adjusts uplink transmission parameters such as modulation and coding scheme, transmission power, and resource allocation based on the terminal's reported capabilities and the actual signal conditions. This enables optimization of uplink performance despite high signal path loss.
2Reliability
If terminal device reports uplink transmission capability in RRC connection setup message, then uplink transmission performance is enhanced, but message complexity increases
Solution Approach 1:
The uplink capability information is segmented into different types (e.g., transport block over multi-slot capability, repeated transmission capability, TB scaling capability) within the RRC connection setup message. This structured segmentation allows for manageable complexity while conveying comprehensive capability information.
Solution Approach 2:
The terminal device selectively reports only the relevant uplink transmission capabilities that apply to its hardware and operational context, rather than reporting all possible capabilities. This partial action approach reduces message complexity while providing sufficient information for performance enhancement.
Data Source
AI summary
A communication method is provided that a terminal device sends first information to a network device, and receives second information from the network device. Correspondingly, the network device receives the first information from the terminal device, and sends the second information to the terminal device. The first information is used to request uplink data transmission enhancement corresponding to the terminal device, and the first information is carried in a radio resource control (RRC) connection setup message of the terminal device. The second information indicates uplink data transmission enhancement corresponding to the terminal device.