NR-Lite Terminal Random Access with Capability-Based Parameters
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Solution Overview
Problem
Existing 5G communication systems lack a method for low-capability NR-lite terminals to perform random access to a base station effectively, limiting their utilization in wireless communication systems.
Innovation Solution
A method for NR-lite terminals to receive and transmit random access preambles using specialized parameter sets and indicators, allowing them to access a cell based on their reduced bandwidth and data rate capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system uses standard random access procedures designed for full-capability terminals, then the random access process is standardized and simple to implement, but low-capability NR-lite terminals cannot effectively perform random access due to bandwidth and processing limitations
Solution Approach 1:
The patent segments the random access procedure into two distinct sets of parameters: a first parameter set for type 1 (full-capability) terminals and a second parameter set for type 2 (NR-lite/low-capability) terminals. This segmentation allows each terminal type to use parameters appropriate to its capabilities, enabling NR-lite terminals to perform random access effectively without requiring full NR terminal capabilities.
Solution Approach 2:
The patent applies local quality by providing different parameter configurations to different terminal types based on their specific capabilities. The base station transmits an indicator that allows terminals to identify which parameter set (first or second) is appropriate for their capability level, ensuring that each terminal uses locally optimized parameters matching its bandwidth and processing characteristics.
2Adaptability or versatility
If the system provides separate parameter sets for different terminal types, then random access support for NR-lite terminals is enabled, but the system information complexity and processing overhead increase
Solution Approach 1:
The patent merges both the first parameter set (for type 1 terminals) and the second parameter set (for type 2 terminals) into a single system information transmission. The base station includes both parameter sets along with an indicator that allows terminals to select the appropriate set, combining multiple configurations in one transmission rather than requiring separate system information messages for each terminal type.
Solution Approach 2:
The patent introduces an indicator as an intermediary element that mediates between the multiple parameter sets and the terminals. This indicator enables terminals to automatically identify and select the appropriate parameter set (first or second) based on their capability type, simplifying the selection process and reducing the burden on both terminals and base stations to manually configure separate parameter sets.
3Productivity
If NR-lite terminals use the same random access parameters as full-capability terminals, then parameter management is simplified, but the random access performance and success rate deteriorate due to mismatched parameters
Solution Approach 1:
The patent applies parameter changes by defining a second parameter set specifically optimized for NR-lite terminals with different bandwidth and processing characteristics. This second parameter set includes modified random access parameters (such as preamble formats, time-frequency resources, and power settings) that are better suited to the limited capabilities of NR-lite terminals, thereby improving their random access efficiency and success rate compared to using the first parameter set designed for full-capability terminals.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. According to an embodiment of the present disclosure, a method of a terminal in a wireless communication system includes: receiving system information including a first parameter set for a random access of a type 1 terminal, a second parameter set for a random access of a type 2 terminal, and an indicator indicating whether the type 2 terminal is supported; in case that the terminal is the type 2 terminal, identifying whether a cell on which the system information is transmitted is available to access based on the indicator; and in case that the cell is identified to be available to access, transmitting a random access preamble based on the second parameter set, wherein a bandwidth supported by the type 2 terminal is less than a first threshold value and a data rate supported by the type 2 terminal is less than a second threshold value.