Random Access Preamble Selection Across Multiple Reference Signals

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing random access procedures, particularly in scenarios involving multiple transmission reception points (TRPs), leading to suboptimal resource utilization and increased latency.

Innovation Solution

The implementation of power control mechanisms for PUSCH transmission with multiple transmission repetitions across multiple TRPs, utilizing SRI and power control parameter offsets to optimize resource allocation and reduce latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If random access procedures are implemented in existing wireless communication systems, then access functionality is provided, but resource utilization is suboptimal and latency is increased

Engineering Contradiction:

Improveresource utilizationVSAvoidlatency

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The random access procedure is divided into multiple independent steps (Msg1 preamble transmission, Msg2 random access response, Msg3 uplink data transmission, Msg4 contention resolution). Each step can be processed and transmitted separately, allowing for optimized resource allocation at each stage and reducing overall procedure latency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The network configures multiple uplink grants and reference signals in advance before the random access procedure begins. These pre-configured resources eliminate the need for real-time resource allocation during the access procedure, reducing latency and improving resource utilization efficiency.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If multiple transmission reception points are used, then system capacity and reliability are improved, but procedure complexity increases

Engineering Contradiction:

Improveaccess reliabilityVSAvoidprocedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The same random access procedure structure is used across multiple transmission reception points, allowing the system to achieve diversity gain and improved reliability without requiring separate procedures for each TRP. The UE can select from multiple configured uplink grants associated with different reference signals from different TRPs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system varies parameters such as reference signal configurations and uplink grant associations across different TRPs, enabling the UE to select the most appropriate resources based on current channel conditions, thereby improving reliability without significantly increasing procedural complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250365677A1Random Access Procedure Using Multiple Reference Signals

Publication Date: 2025.11.27 OFINNO LLC

AI summary

A wireless device receives at least two downlink reference signals (RSs). The wireless device transmits, for a random access procedure, one or more random access preambles based on a first downlink RS of the at least two downlink RSs and a second downlink RS of the at least two downlink RSs. The wireless device receives one or more random access responses, associated with at least one of the one or more random access preambles, scheduling a physical uplink shared channel (PUSCH) transmission. The wireless device transmits at least one of one or more first repetitions, of the PUSCH transmission, based on the first downlink RS or one or more second repetitions, of the PUSCH transmission, based on the second downlink RS.