Preamble Allocation for Mobile Random Access Collision Reduction
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Solution Overview
Problem
The random access procedure in mobile communication systems experiences delays and collisions due to contention-based resource allocation, particularly in packet switch-based systems where radio resources are shared among multiple mobile stations.
Innovation Solution
The method involves dividing preamble resources into a contention-based group and a reserved allocation group, where preamble resources are allocated to mobile stations that satisfy predetermined conditions, allowing for pre-allocated resources to be used for random access, thereby reducing contention and delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If contention-based random access procedure is used in packet switch-based mobile communication systems, then mobile stations can access the base station without dedicated radio resource allocation, but collisions occur and delay in performing random access procedure and allocating radio resources increases
Solution Approach 1:
The preamble resources are segmented into two distinct groups: contention-based preambles and reserved preambles. Mobile stations in idle state use contention-based preambles, while mobile stations in active state use reserved preambles. This segmentation allows different access procedures for different mobile station states, reducing collisions for active stations while maintaining adaptability for all mobile stations.
Solution Approach 2:
Reserved preambles are allocated to mobile stations in advance before they need to perform random access. The base station pre-assigns specific preamble resources to active mobile stations, so when these stations need to access the base station, they can immediately use their pre-allocated preamble without waiting for contention resolution, thereby eliminating access delay.
2Adaptability or versatility
If contention-based random access procedure is used, then any mobile station can use the same preamble resources, but collision occurs causing delay in radio resource allocation
Solution Approach 1:
Preamble resources are divided into contention-based group and reserved group. The reserved group is exclusively allocated to specific mobile stations in active state, eliminating collisions for these stations. The contention-based group remains available for idle state mobile stations, maintaining system accessibility. This dual-group structure simultaneously improves reliability for active stations and preserves adaptability for all stations.
Solution Approach 2:
Different quality characteristics are assigned to different preamble groups: reserved preambles provide collision-free, high-reliability access for active mobile stations, while contention-based preambles provide flexible, accessible resources for idle mobile stations. Each group is optimized for its specific use case, allowing the system to achieve both high reliability and broad accessibility.
Data Source
AI summary
The present invention relates to aA preamble allocation method and a random access method in a mobile communication system. In the present invention,includes allocating one among preamble resources is allocated to a specific mobile stationsstation in advance, before random access. The mobile stations requeststation requests random access by transmitting a preamble based on the pre-allocated preamble resource to a base station. It is therefore possible to preventA collision caused by the fact that other mobile stations transmit the same preamblethe same preamble transmission by another mobile station may be prevented.