BWP Switching for Terminal-Matched 2-Step and 4-Step Random Access
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Solution Overview
Problem
Communication systems often configure only one type of random access for bandwidth parts (BWPs), leading to mismatched configurations that do not align with terminal capabilities, resulting in random access failures and inefficient communication.
Innovation Solution
A method and apparatus for switching between BWPs or initiating specific random access procedures based on terminal capabilities, ensuring that configurations match, thereby allowing terminals to perform 2-step or 4-step random access as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one type of random access is configured for a BWP, then the configuration is simple, but it does not match terminal capabilities leading to access failures
Solution Approach 1:
The patent implements dynamic random access configuration by allowing the network to configure multiple random access types (2-step and 4-step) for different BWPs and dynamically select which type to use based on terminal capability matching. The terminal switches between different random access configurations depending on which BWP is active, making the system adaptive rather than static.
Solution Approach 2:
The patent changes the configuration parameters by introducing multiple random access type options (2-step vs 4-step) with different parameter sets including RACH resources, monitoring configurations, and procedure parameters. The network can adjust these parameters based on terminal capabilities and network conditions to optimize access success.
2Productivity
If 2-step random access is configured but terminal capability does not match, then configuration is provided, but random access failure occurs
Solution Approach 1:
The patent implements a capability matching mechanism where the network receives terminal capability information and uses this feedback to determine whether to configure 2-step or 4-step random access. The terminal provides feedback about its supported random access types, and the network adjusts the configuration accordingly to ensure compatibility and prevent access failures.
Solution Approach 2:
The patent performs preliminary capability assessment before configuring random access parameters. The network evaluates terminal capabilities in advance and pre-configures appropriate random access types and parameters that match the terminal's abilities, preventing configuration mismatches before they occur.
3Adaptability or versatility
If multiple random access types are configured for different BWPs, then terminal capability matching is improved, but configuration and management becomes more complex
Solution Approach 1:
The patent segments the random access configuration by dividing it into different BWP-specific configurations. Each BWP can have its own random access type (2-step or 4-step) and parameters independently configured. This segmentation allows the network to optimize each BWP separately based on terminal capabilities without affecting other BWPs, making management more organized despite the increased number of configurations.
Data Source
AI summary
A switching method, a configuration method, a random access processing method, and a device are provided. The switching method includes: a terminal performing a first operation in a case that a first BWP satisfies a first condition, where the first condition includes at least one of: a target configuration on the first BWP does not match a capability of the terminal, no 4-step random access is configured on the first BWP, and a random access failure occurs, where the target configuration includes at least one of: a random access channel RACH resource and a monitoring configuration for a downlink channel; and the first operation includes: switching to a second BWP; or initiating random access or monitoring the downlink channel on the second BWP; or on the first BWP, performing a 4-step random access procedure or monitoring a downlink channel corresponding to the 4-step random access procedure.