Random Access Response TA Adjustment Signaling
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Solution Overview
Problem
Current NTN network protocols cannot accurately indicate a Timing Advance (TA) adjustment amount that is negative or zero, which is necessary for terminals with positioning capabilities to correctly synchronize with the network during random access processes.
Innovation Solution
The proposed solution involves a random access method where the network device transmits a random access response indicating a TA adjustment amount that can be a positive value, a negative value, or zero, allowing terminals to adjust their timing accordingly, using a combination of bit fields and mapping tables to convey the absolute value and attribute of the TA adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current NTN network protocols use traditional TA indication methods, then the protocol structure remains simple, but terminals with positioning capabilities cannot accurately synchronize uplink timing when TA adjustment amount is negative or zero
Solution Approach 1:
The TA adjustment indication is segmented into two independent parts: an absolute value field and a positive-negative attribute field. The absolute value field carries the magnitude of TA adjustment, while the positive-negative field indicates whether to add or subtract the adjustment. This segmentation allows precise indication of negative and zero TA values without complicating the overall protocol structure.
Solution Approach 2:
The patent adds a new dimension to the TA indication by introducing a positive-negative attribute field alongside the traditional absolute value field. This dimensional expansion transforms the single-dimensional TA indication into a two-dimensional representation, enabling precise indication of negative, zero, and positive TA adjustment amounts.
2Ease of operation
If the network device transmits TA adjustment amount as positive value only, then the transmission is simple, but terminals cannot correctly adjust timing when actual TA requires negative or zero values
Solution Approach 1:
The patent performs preliminary encoding of the TA adjustment amount into absolute value and positive-negative attribute fields before transmission. This preliminary action ensures that the terminal receives pre-processed information that directly indicates both magnitude and direction (positive or negative) of the adjustment, eliminating the need for complex interpretation and ensuring reliable timing synchronization.
Solution Approach 2:
The positive-negative attribute field acts as an intermediary that carries the sign information of the TA adjustment. Instead of transmitting negative values directly (which would be complex), the patent uses this intermediary field to indicate whether the adjustment should be positive or negative, simplifying the transmission while maintaining reliability.
3Measurement precision
If the patent uses bit fields and mapping tables to convey TA adjustment, then accurate TA indication is achieved, but the processing complexity increases
Solution Approach 1:
The TA adjustment indication is segmented into two independent parts: an absolute value field and a positive-negative attribute field. The absolute value field carries the magnitude of TA adjustment, while the positive-negative field indicates whether to add or subtract the adjustment. This segmentation allows precise indication of negative and zero TA values without complicating the overall protocol structure.
Data Source
AI summary
The present disclosure relates to a random access method and apparatus, a network device, a terminal, and a storage medium. The terminal transmits a random access request to a network device; and receives a random access response, which is returned by the network device based on the random access request. The random access response is used to indicate a value of an uplink Timing Advance (TA) adjustment amount, and the TA adjustment amount is a positive value, a negative value, or 0.