SIM Preamble Coordination to Prevent Multi-Card Self-Collision
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Solution Overview
Problem
Multi-card terminals experience self-collision during random access due to multiple SIM cards selecting the same preamble, leading to identity verification failures and performance issues.
Innovation Solution
Selecting different modes or PRACH resources for SIM cards with the same selected preamble to avoid self-collision, ensuring each SIM card uses a unique preamble or resource for random access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple SIM cards select preambles independently during random access, then each SIM card can perform random access autonomously, but the probability of selecting the same preamble increases, causing random access failure
Solution Approach 1:
The terminal determines whether preambles selected by different SIM cards collide and adjusts the random access process accordingly. When collision is detected, the terminal notifies relevant SIM cards to reselect preambles or use alternative resources, creating a feedback loop that resolves the contradiction between autonomous access and success rate.
Solution Approach 2:
The patent changes the random access parameters by introducing different physical random access channel (PRACH) resources for different SIM cards. This parameter differentiation allows multiple SIM cards to access the network simultaneously without preamble collision, maintaining both autonomy and success rate.
2Reliability
If the network treats different SIM cards as different terminals, then each SIM card can be independently verified, but multiple SIM cards may select the same random access preamble, causing self-collision and access failure
Solution Approach 1:
The patent segments the random access resources by introducing terminal-specific PRACH resources. Different SIM cards are assigned different PRACH resources within the same uplink time-frequency resource, allowing the network to verify multiple SIM cards independently while avoiding self-collision through resource segmentation.
Solution Approach 2:
The patent adds a new dimension to random access resource allocation by introducing a terminal identifier dimension. Besides the traditional preamble dimension, resources are now differentiated by terminal ID, creating a two-dimensional resource space that prevents collision while maintaining independent verification capability.
Data Source
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AI summary
The present invention relates to a random access method and apparatus, and user equipment and a computer readable storage medium. The random access method is applied to a multi-card terminal, and at least two SIM cards are installed on the multi-card terminal. The method comprises: obtaining random access preambles selected by at least two SIM cards; and if the random access preambles selected by the at least two SIM cards are the same, selecting different modes for the at least two SIM cards to carry out random access. Embodiments of the present invention can solve the problem of self-collision of the multi-card terminal in the random access process, and improve the probability of successful random access of one or more SIM cards belonging to the same multi-card terminal, thereby improving the performance of the multi-card terminal.