Contention-Based Preamble Segmentation for Random Access Collision Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In contention-based wireless communication networks, multiple user equipments often select the same random access preamble, leading to collisions and significant delays due to unsuccessful random access requests.
Innovation Solution
Divide contention-based preambles into sub-groups based on the number of users supported by the network, categorize users into sub-groups, and assign different PRACH Mask values to disperse random access channel opportunities in time, reducing collisions by allowing users within a sub-group to access preambles at different times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user equipments use contention-based random access with the same preamble, then the random access procedure is simple and fast, but collisions occur leading to access failures and delays
Solution Approach 1:
The patent segments the random access procedure by dividing preambles into groups and users into sub-groups. Each sub-group is assigned to specific preamble groups, creating segmented access paths that reduce collisions while maintaining procedural simplicity. This segmentation allows multiple users to access the network simultaneously with different preamble groups, improving both reliability and productivity.
Solution Approach 2:
The network performs preliminary categorization of users into sub-groups before the random access attempt. This preliminary action assigns each user to specific preamble groups based on their sub-group membership, preventing collisions before they occur. The network prepares and communicates the allowed preamble group assignments in advance, ensuring reliable access without delays.
2Quantity of substance
If the network supports more users with contention-based access, then network capacity increases, but the probability of preamble collision increases
Solution Approach 1:
The patent divides the set of preambles into multiple groups and segments users into sub-groups, where each sub-group is assigned to specific preamble groups. This segmentation allows the network to support more users simultaneously by distributing them across different preamble groups, thereby increasing network capacity while reducing collision probability through spatial and temporal separation of access attempts.
3Adaptability or versatility
If all users are allowed to access any preamble simultaneously, then access flexibility is maximized, but collision risk increases
Solution Approach 1:
The network performs preliminary assignment of allowed preamble groups to each user based on their sub-group membership. This preliminary action provides users with flexible preamble selection within their assigned groups while preventing inter-group collisions. The flexibility is maintained within constraints that ensure reliable access, reducing delays caused by collision-induced retransmissions.
Data Source
AI summary
The embodiments herein provide a method and system for preventing collisions in a contention based random access preambles in a communication network. The method comprises of dividing the contention based preambles into a plurality of sub-groups, categorizing a plurality of users into a plurality of sub-groups, scheduling the users within a preamble subgroup in one or more random access channel opportunities and transmitting information on the sub-groups of the preamble and the random access channel opportunities to one or more user equipments. The users within a sub-group are provided access to the set of contention based preambles dispersed in time thereby reducing the number of user equipments colliding on a single random access preamble channel.