Random Access Feedback Repetition for Satellite Link Coverage
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Solution Overview
Problem
Satellite communication faces challenges with lower link budgets due to longer distances and larger path losses, necessitating coverage enhancement for channels carrying feedback information of Msg4/MsgB to enable ground terminal devices to connect directly to satellite base stations.
Innovation Solution
A random access method involving a communication apparatus that determines and utilizes reserved resources for repeated transmission of feedback information, indicated by control information, to enhance coverage on channels carrying Msg4/MsgB feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite communication is used to connect ground terminal devices to satellite base stations, then coverage area is expanded, but link budget deteriorates due to longer communication distance and larger path loss
Solution Approach 1:
The system performs preliminary allocation of reserved resources for feedback information transmission before actual communication occurs. The network device pre-configures time-frequency resources and repetition parameters based on predicted channel conditions, allowing the terminal to directly execute the predetermined transmission strategy without real-time negotiation, thus compensating for path loss through advance preparation of robust transmission parameters
Solution Approach 2:
The system dynamically adjusts transmission parameters including the number of repetitions, time-frequency resource allocation, and power levels based on channel quality indicators. When path loss is detected to be high, the system increases the number of repetitions and allocates more robust time-frequency resources, thereby adapting the link budget to the actual propagation conditions while maintaining satellite communication coverage
2Reliability
If coverage enhancement is implemented through repeated transmission of feedback information, then reliability is improved, but communication efficiency deteriorates due to increased transmission time and resource occupation
Solution Approach 1:
The system implements feedback information transmission with a predetermined number of repetitions that is sufficient to achieve the required reliability threshold but not excessive. The network device configures the repetition count based on the minimum necessary to overcome the satellite channel's path loss, avoiding unnecessary retransmissions that would waste time-frequency resources and reduce overall communication efficiency
Solution Approach 2:
The system uses periodic repetition of feedback information at optimized intervals rather than continuous transmission. The time-frequency reserved resources are scheduled at specific periodic intervals that balance the need for reliable reception against the desire to minimize resource occupation, allowing other communications to occur in between repetition cycles
Data Source
AI summary
A random access method includes receiving first control information, where the first control information indicates a first reserved resource and a number of repetitions of first feedback information, the number of repetitions of the first feedback information is greater than or equal to 1, the first feedback information indicates a decoding result of a message B (MsgB) or a decoding result of a message 4 (Msg4), the first reserved resource is one of one or more reserved resources, and each of the one or more reserved resources is used for sending the first feedback information once; and determining the one or more reserved resources based on the first control information.