Random Access Preamble Transmission with Frequency Domain Diversity
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Solution Overview
Problem
In wireless communication systems, the existing random access preamble transmission methods face challenges with multiple available random access channel resources, leading to increased interference and reduced successful access probability, particularly in contention-based random access scenarios.
Innovation Solution
The method involves allocating multiple random access channel resources to a user equipment (UE) and transmitting a dedicated preamble across all allocated resources, allowing for simultaneous transmission and reducing interference by using frequency domain diversity, thereby increasing the chances of successful access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple random access channel resources are allocated for preamble transmission, then the success rate of random access is improved, but the interference level increases
Solution Approach 1:
The random access channel resources are segmented into multiple distinct resources (different time slots, frequency resources, or code sequences). Each segment is assigned to different UEs or different transmission attempts, allowing the system to distribute interference across segments rather than concentrating it in a single resource, thereby improving overall access success while managing interference levels.
Solution Approach 2:
The patent introduces frequency domain diversity by allocating resources across different frequency dimensions. UEs transmit preambles on multiple frequency resources simultaneously or sequentially, transforming the problem from a single-dimension resource contention to a multi-dimensional resource allocation, which reduces interference impact and improves access reliability.
2Reliability
If a dedicated preamble is transmitted over multiple allocated resources, then interference is reduced through frequency domain diversity, but the device complexity increases
Solution Approach 1:
The eNB is designed with universal functionality to handle multiple preamble transmission scenarios across different resource types (time, frequency, code). The base station implements a unified resource allocation and detection mechanism that can manage dedicated preambles transmitted over multiple resources without requiring separate specialized systems, thereby reducing overall system complexity while maintaining improved access probability.
3Productivity
If multiple RACH resources are allocated for contention-based random access, then the access performance is improved, but the impact on other UEs increases
Solution Approach 1:
The patent applies local quality by allocating specific RACH resources with tailored characteristics to different UEs or different access scenarios. Instead of uniform resource allocation, each UE or access attempt receives resources optimized for its specific conditions (channel quality, traffic type, priority), which improves overall access performance while minimizing negative impacts on other UEs through localized resource optimization.
Data Source
AI summary
A method for use of a RA preamble with multiple available RACH resources is described. The method includes allocating resources including a plurality of RACH resources for a UE. Information that indicates a dedicated preamble and the allocated resources is sent to the UE. The UE receives the information. A response including the dedicated preamble is generated at the UE. The method also includes the UE sending the response over at least two of the allocated resources. In response to receiving at least one response, a message is transmitted to the UE. Apparatus and computer readable media are also described.