Terminal Random Access Channel Segmentation for eRedCap Initial Access
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Solution Overview
Problem
In advanced wireless communication systems like 6G, the capability reporting of terminals with enhanced reduced functions (eRedCap) during initial access is unclear, leading to challenges in distinguishing and configuring random access channels for these devices.
Innovation Solution
A terminal configuration that allows for transmitting and receiving random access channels based on individually set configurations for terminals with reduced functions, either eRedCap or RedCap, or without reduced functions, enabling proper initial access by distinguishing between different function reductions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single random access channel configuration is used for all terminals, then device complexity is reduced and ease of operation is improved, but the ability to properly support terminals with different function reduction levels (eRedCap vs. RedCap) deteriorates
Solution Approach 1:
The random access channel configuration is segmented into multiple types: Type 1 for eRedCap terminals, Type 2 for RedCap terminals, and Type 3 for normal terminals. This segmentation allows each terminal type to use the configuration most suitable for its capabilities, resolving the contradiction between simplicity and adaptability by providing structured differentiation rather than a single universal configuration.
Solution Approach 2:
Different quality levels of random access channel configurations are assigned to different terminal types based on their specific capabilities. eRedCap terminals receive Type 1 configuration optimized for their reduced functions, while RedCap terminals receive Type 2 configuration. This local quality approach ensures each terminal operates with appropriately tailored parameters without requiring all terminals to support all configuration types.
2Loss of time
If terminal capability reporting is simplified, then initial access speed is improved and delay is reduced, but measurement precision of terminal capabilities deteriorates
Solution Approach 1:
The terminal determines its applicable random access channel configuration type in advance based on pre-defined capability criteria before initiating random access. This preliminary determination allows the terminal to directly use the appropriate configuration without extensive capability negotiation during initial access, thereby reducing delay while maintaining accurate capability identification through pre-established rules.
Solution Approach 2:
Different random access channel configuration parameters (such as time resources, frequency resources, and preamble formats) are assigned to different terminal capability types. By changing these parameters based on terminal type, the system achieves both fast initial access (through pre-configured parameters) and accurate capability identification (through parameter-based differentiation).
Data Source
AI summary
A terminal includes a communication unit configured to transmit and receive a random access channel, and a controller configured to assume that the random access channel is transmitted and received based on at least one of a configuration of the random access channel set individually for a second terminal with reduced functions that is different from a terminal without a first reduced functions or terminal with reduced functions; a configuration of the random access channel set individually for the first terminal with functions, a reduced or configuration of the random access channel for the terminal without reduced functions, wherein second functions, which are different from first functions reduced in the first terminal with reduced functions, are reduced.