Random Access Identifier Mapping for Wireless Collision Reduction
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Solution Overview
Problem
The existing random access procedures in wireless communication systems, such as those based on WCDMA, face inefficiencies due to potential collisions during contention-based access and the need for improved resource management, which can lead to delays and increased power consumption in user equipment.
Innovation Solution
A method is introduced where a random access identifier (RA-ID) is mapped to specific radio resources, allowing user equipment to efficiently perform random access procedures by addressing responses directly to the correct user equipment, thereby reducing collisions and enhancing procedure efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If contention based random access procedure is used, then resource allocation flexibility is improved, but collision probability increases
Solution Approach 1:
The random access procedure is segmented into two distinct types: contention-based and non-contention-based. This segmentation allows the system to choose the appropriate procedure based on specific requirements, thereby reducing collision probability while maintaining resource allocation flexibility when needed.
Solution Approach 2:
The invention changes the parameter of signature assignment from shared (contention-based) to dedicated (non-contention-based). By assigning dedicated signatures specifically for non-contention-based random access, the system eliminates collisions for critical operations like initial access and handover, while still allowing contention-based access for other scenarios.
2Reliability
If non-contention based random access procedure is used, then collision probability is reduced, but system complexity increases
Solution Approach 1:
The invention creates a universal random access framework that incorporates both contention-based and non-contention-based procedures. The base station and user equipment are designed to handle both types of procedures through a unified mechanism, reducing system complexity while providing the benefits of collision-free access when needed.
Solution Approach 2:
The system performs preliminary assignment of dedicated signatures for non-contention-based random access. By pre-configuring these dedicated resources, the system eliminates the need for complex collision resolution mechanisms during actual access, thereby reducing overall system complexity while maintaining low collision probability.
3Productivity
If random access response is not immediately confirmed, then message exchange is reduced, but access delay increases
Solution Approach 1:
The invention implements an immediate feedback mechanism where the base station sends a random access response that includes explicit confirmation (ACK/NACK) to the user equipment. This feedback allows the user equipment to immediately confirm whether the random access was successful, reducing access delay while maintaining efficient message exchange through the structured response format.
Solution Approach 2:
The base station performs preliminary preparation of the random access response, including determining ACK/NACK status and selecting appropriate uplink resources, before transmitting the response to the user equipment. This preliminary action enables immediate confirmation without requiring additional round-trip communication, thereby reducing access delay.
Data Source
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AI summary
There is provided with a method for enabling a user equipment to perform a random access procedure in a wireless communication system. The method includes transmitting a random access preamble and receiving a random access response as a response to the random access preamble. The random access response is addressed by a random access identifier. The random access identifier is mapped to radio resources used for transmitting the random access preamble. The user equipment can immediately confirm its random access response and perform further efficient random access procedure.