RACH Configuration Within Active BWP to Avoid RF Retuning
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Solution Overview
Problem
In wireless communication systems, User Equipment (UE) experiences interruptions during Random Access Channel (RACH) transmissions due to the need for RF retuning when selecting RACH resources outside the currently active Bandwidth Part (BWP), leading to inefficiencies and potential service disruptions.
Innovation Solution
The UE is configured with information to associate a RACH configuration with an active BWP, allowing it to perform RACH transmissions within the active BWP, thereby avoiding unnecessary interruptions by using RACH resources or opportunities within the currently active frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE selects RACH resources outside the currently active Bandwidth Part (BWP), then more RACH resource options are available, but RF retuning interruptions occur during RACH transmissions
Solution Approach 1:
The network configures the UE with RACH resources within the active BWP before RACH transmission is needed. This preliminary configuration ensures that when the UE needs to perform RACH, the resources are already available within the current frequency range, eliminating the need for RF retuning and avoiding transmission interruptions.
Solution Approach 2:
The patent dynamically associates RACH resources with the currently active BWP. When the BWP changes, the available RACH resources are updated to match the new active BWP. This dynamic adaptation allows the system to maintain optimal resource availability while avoiding RF retuning interruptions, as the UE always uses resources within the current frequency range.
2Productivity
If the UE performs RACH transmissions outside the active BWP, then resource utilization across the bandwidth is improved, but transmission interruptions and service disruptions increase
Solution Approach 1:
The patent applies local quality by configuring RACH resources specifically within the active BWP rather than uniformly across the entire bandwidth. This localized resource allocation ensures that RACH transmissions occur within the current frequency range, maintaining transmission continuity and reliability while still providing adequate resource options within the active BWP for efficient utilization.
3Adaptability or versatility
If the UE is configured with multiple BWPs and RACH resources across all BWPs, then resource availability is increased, but system complexity and configuration overhead increase
Solution Approach 1:
The network performs preliminary configuration of RACH resources within the active BWP before the UE needs to transmit. This advance configuration simplifies the UE's task by providing ready-to-use resources within the current frequency range, reducing the complexity of real-time resource selection and management while maintaining high resource availability through proper BWP configuration.
Solution Approach 2:
The system dynamically updates RACH resource availability based on the current active BWP state. When the BWP changes, the available RACH resources are automatically updated to reflect the new frequency range. This dynamic approach maintains adaptability and resource availability while simplifying configuration management, as the UE only needs to monitor the active BWP state rather than managing resources across all possible BWPs.
Data Source
AI summary
A method and apparatus are disclosed from the perspective of a User Equipment (UE), wherein the UE is configured with multiple Bandwidth Parts (BWPs). In one embodiment, the method includes the UE receiving information from a network node to associate a RACH (Random Access Channel) configuration with a BWP among the multiple BWPs. The method further includes that the UE performing a RACH transmission in the BWP using the RACH configuration associated with the BWP.