Two-Step Random Access Resource Segmentation for 5G UE Capacity
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Solution Overview
Problem
The Two-Step Random Access mechanism in 5G NR systems faces challenges in supporting a large number of users with enhanced system capacity and higher radio resource utilization, particularly in multi-beam scenarios, leading to conflicts and increased signaling overhead.
Innovation Solution
A method involving the transmission of two characteristic radio signals and a first radio signal using distinct sequences and resources, where parameters of one channel are related to those of another, to differentiate users and reduce resource conflicts, thereby enhancing access resources and reducing receiver complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Two-Step Random Access mechanism is employed to shorten access time and reduce signaling interaction, then access speed is improved, but system capacity and radio resource utilization are insufficient to support massive users
Solution Approach 1:
The patent segments the random access process into two distinct steps: a first random access step using first random access resources and a second random access step using second random access resources. This segmentation allows the system to handle massive users by dividing the access process into manageable phases, improving both access speed and system capacity. The first step performs initial access with reduced signaling, while the second step completes the connection establishment, resolving the contradiction between fast access and high capacity.
2Loss of energy
If Two-Step Random Access mechanism is used to reduce signaling interaction, then signaling overhead is reduced, but conflicts between user accesses increase
Solution Approach 1:
The patent introduces a temporal dimension by separating random access resources into first random access resources and second random access resources that operate at different times. This dimensional separation allows multiple users to access the system simultaneously without conflicts, while maintaining reduced signaling overhead. The first step uses one set of resources for initial access, and the second step uses another set for completion, eliminating conflicts while preserving efficiency.
3Reliability
If more orthogonal resources are allocated to avoid conflicting accesses, then access conflicts are reduced, but receiver complexity for blind detection increases
Solution Approach 1:
The patent segments the resource allocation into two distinct phases with different resource sets. In the first random access step, the receiver performs blind detection using first random access resources. In the second step, the receiver uses second random access resources which have different characteristics. This segmentation allows the receiver to maintain lower complexity by processing detections in two simpler stages rather than requiring high complexity to handle all possible orthogonal resources simultaneously.
Data Source
AI summary
The present disclosure provides a method and a device in a UE and a base station for wireless communications. A UE transmits a first characteristic radio signal in a first radio resource, a first sequence being used for generating the first characteristic radio signal; transmits a second characteristic radio signal in a second radio resource, a second sequence being used for generating the second characteristic radio signal; and transmits a first radio signal in a third radio resource. Herein, parameters of a channel that the first radio signal goes through are related to parameters of a channel that the second characteristic radio signal goes through; a first ID is used for determining at least one of the second sequence or the first radio signal. The presents disclosure can reduce conflicting access to the UE, thereby enhancing the capacity of access to the UE.