Initial Downlink BWP Configuration for Connected RedCap Random Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
RedCap terminals in a connected state face communication anomalies during random access due to issues with transmitting exclusive information when switching to the initial downlink BWP, particularly in TDD systems with misaligned center frequencies and absence of SSB.
Innovation Solution
A network device configures initial downlink BWPs with SSB and consistent center frequencies, and provides configuration information to terminals to determine if the BWP supports random access, ensuring accurate BWP selection to avoid communication failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the initial downlink BWP is configured for RedCap terminal, then the terminal can perform random access, but the terminal cannot transmit exclusive information leading to communication anomaly
Solution Approach 1:
The patent divides the BWP configuration into two independent parts: a first BWP configured for random access with SSB, and a second BWP configured for transmitting exclusive information. This segmentation allows the terminal to perform random access on the first BWP while maintaining communication integrity on the second BWP, resolving the contradiction between random access capability and communication reliability.
Solution Approach 2:
The patent introduces a search space as an intermediary mechanism. The search space contains indication information that tells the terminal which BWP to use for random access and which BWP to use for transmitting exclusive information. This intermediary coordination mechanism ensures that the terminal can perform random access while avoiding communication anomalies by correctly selecting the appropriate BWP for each function.
2Device complexity
If the initial downlink BWP does not include SSB, then the BWP can be simplified, but the terminal cannot perform random access in connected state
Solution Approach 1:
The patent segments the BWP functions by configuring the first BWP specifically for random access with SSB inclusion, while the second BWP is configured for exclusive information transmission without requiring SSB. This segmentation allows the system to maintain random access capability where needed while simplifying BWP configuration where SSB is not required.
3Ease of operation
If the center frequency of initial downlink BWP is not consistent with initial uplink BWP, then TDD alignment issues are avoided, but communication anomalies occur during random access
Solution Approach 1:
The patent segments the frequency configuration by allowing the first BWP to have a center frequency consistent with the initial uplink BWP for random access, while the second BWP can have different frequency characteristics for exclusive information transmission. This segmentation resolves the contradiction by enabling proper frequency alignment for random access without requiring the entire BWP configuration to maintain consistent center frequencies.
Data Source
AI summary
A random access method includes: determining configuration information, wherein the configuration information is configured to determine an initial downlink bandwidth part (BWP) configured for a terminal, and determine whether the initial downlink BWP supports that the terminal in a connected state performs random access.