Random Access Resource Switching in 5G Bandwidth Parts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G New Radio (NR) technology faces challenges in optimizing random access procedures, particularly in determining available random access resources within bandwidth parts, which affects the efficiency and latency of user equipment (UE) communication with base stations.
Innovation Solution
The method involves a UE receiving a request to initiate a random access procedure and determining whether the active bandwidth part contains available random access resources. If not, the UE switches to another bandwidth part with available resources and transmits a preamble sequence at a selected random access resource, ensuring a specific time duration subsequent to the request, while if resources are available in the first part, the UE transmits the sequence at a shorter time duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for random access resources in the current active bandwidth part, then resource availability is maintained, but access latency increases
Solution Approach 1:
The patent implements dynamic bandwidth part switching based on real-time random access resource availability. The UE monitors the active bandwidth part for available random access resources and dynamically switches to a different bandwidth part when resources are unavailable, thereby reducing access latency while maintaining reliable resource availability through adaptive resource selection across multiple bandwidth parts.
2Productivity
If the UE switches bandwidth parts to find available random access resources, then access efficiency improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple bandwidth parts with their respective random access resources before the actual random access procedure. The UE is provided with information about available random access resources in different bandwidth parts in advance, allowing it to quickly determine and switch to an appropriate bandwidth part without complex real-time resource discovery, thus improving access efficiency while managing device complexity.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A UE receives a request from a base station to initiate a random access procedure in a connected state. When a first bandwidth part does not contain any random access resource that is available, the UE: switches to a second bandwidth part that contains one or more random access resources that are available and transmits a preamble sequence at a first random access resource selected from the one or more random access resources that are available. When the first bandwidth part contains the one or more random access resources that are available, the UE transmits the preamble sequence at a second random access resource selected from the one or more random access resources that are available. The second random access resource is at least a second time duration subsequent to the request. The second time duration is shorter than the first time duration.