5G Random Access PUSCH PRACH Mapping Reduces Blind Detection

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Solution Overview

Problem

In the 5G mobile communication system, the random access process involves high processing complexity for network devices due to the need to blindly detect all possible PRACH and PUSCH transmission positions, especially when multiple terminals use the same PRACH preamble, which affects access success rates and resource management.

Innovation Solution

A method where a preset mapping relationship between physical uplink shared channel (PUSCH) and physical random access channel (PRACH) resources is established, allowing terminals to send random access messages on these resources, thereby determining transmission positions consistently across both channels, reducing blind detection and improving processing efficiency and access success rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If network devices blindly detect all possible PRACH and PUSCH transmission positions, then all random access messages can be received, but processing complexity increases significantly

Engineering Contradiction:

Improverandom access message receptionVSAvoidprocessing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The network device pre-configures mapping relationships between SSBs and ROs, and between ROs and PUSCH resources, before the random access process. Terminals use these pre-established mappings to determine transmission positions, eliminating the need for blind detection and significantly reducing processing complexity while ensuring reliable message reception

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces mapping relationships as intermediary structures that connect SSBs to ROs and ROs to PUSCH resources. These mappings act as mediators that guide both terminals and network devices to consistent transmission and reception positions without requiring exhaustive blind detection, thus reducing complexity while maintaining reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If multiple terminals use the same PRACH preamble, then resource utilization improves, but access success rates decrease due to detection difficulties

Engineering Contradiction:

Improveresource utilizationVSAvoidaccess success rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the random access resources by establishing one-to-one mappings between different SSBs and different ROs. Even when multiple terminals use the same preamble, they are associated with different SSBs and thus different ROs through the mapping relationships, eliminating collision and ensuring successful access while allowing efficient resource sharing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different mapping relationships locally to different SSBs and ROs. Each SSB-RO pair has its own mapping, allowing multiple terminals with the same preamble to be differentiated based on their associated SSBs. This local differentiation ensures successful access while maintaining overall resource utilization efficiency

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If no mapping relationship is established between PUSCH and PRACH resources, then resource flexibility is maintained, but transmission position consistency cannot be ensured

Engineering Contradiction:

Improveresource flexibilityVSAvoidtransmission position consistency

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The network device pre-configures mapping relationships between PUSCH resources and PRACH resources (via ROs and SSBs) before terminals initiate random access. These pre-established mappings ensure that both terminals and network devices use consistent transmission positions while maintaining resource flexibility through configurable mapping patterns

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The mapping relationships serve multiple functions simultaneously: they ensure transmission position consistency, enable resource flexibility through configurable patterns, and provide a universal framework that works for all terminals regardless of their specific access scenarios. The same mapping mechanism handles both position consistency and resource allocation flexibility

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12127258B2Information transmission method for a random access process and terminal

Publication Date: 2024.10.22 VIVO MOBILE COMM CO LTD

AI summary

An information transmission method for a random access process includes: obtaining a preset mapping relationship between a physical uplink shared channel resource and a physical random access channel resource; and sending a random access message on a random access resource according to the preset mapping relationship. The random access resource comprises the PUSCH resource and the PRACH resource. When a random access channel occasion corresponding to the PRACH resource is not associated with an SSB, the RO is not associated with the PUSCH resource.