Random Access Identifier for Reduced Capability Devices
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently managing random access procedures across diverse wireless devices and base stations, particularly in handling mixed technologies and varying capabilities within a coverage area, leading to suboptimal performance and coverage issues.
Innovation Solution
The implementation of advanced NR (New Radio) protocols and architecture, including flexible bandwidth management, carrier aggregation, and optimized random access procedures, allows for selective implementation of communication methods based on device capabilities, traffic load, and network configurations, enabling improved coverage and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional random access procedures are used in mixed technology networks, then legacy devices can maintain compatibility, but network efficiency and coverage deteriorate due to suboptimal performance
Solution Approach 1:
The random access procedure is segmented into multiple stages: legacy random access for backward compatibility, followed by capability exchange and conditional NR random access. This segmentation allows legacy devices to use traditional procedures while capable devices can transition to optimized NR procedures, resolving the contradiction between compatibility and efficiency.
Solution Approach 2:
The system dynamically adapts the random access procedure based on device capabilities. Devices exchange capability information and conditionally execute different random access workflows - legacy devices follow traditional procedures while NR-capable devices utilize optimized procedures with flexible bandwidth and carrier aggregation, achieving both compatibility and improved efficiency.
2Productivity
If advanced NR protocols with flexible bandwidth management are implemented, then network efficiency and resource allocation improve, but device complexity and implementation difficulty increase
Solution Approach 1:
Device capability information is exchanged in advance during the random access procedure. This preliminary action allows the network to understand device capabilities before allocating resources, enabling efficient resource allocation without requiring devices to continuously adapt to complex protocols, thus reducing implementation difficulty while maintaining efficiency.
Solution Approach 2:
Advanced NR features such as flexible bandwidth management and carrier aggregation are selectively applied only to devices that support them. Legacy devices continue using traditional procedures, while capable devices receive optimized resource allocation. This localized application of advanced features improves overall efficiency without forcing complexity on all devices.
3Reliability
If conditional random access procedures are used to adapt to diverse device capabilities, then coverage and performance improve, but procedure complexity and signaling overhead increase
Solution Approach 1:
The random access procedure is designed to serve multiple functions: it performs initial access, capability exchange, and conditional procedure selection all in one unified workflow. This multi-functionality allows the system to adapt to diverse device capabilities and improve coverage without requiring separate complex procedures for different device types, reducing overall procedure complexity.
Data Source
AI summary
A wireless device receives one or more radio resource control (RRC) messages comprising random access (RA) configuration parameters of a bandwidth part (BWP) of a cell, indicating one or more random access channel occasions (ROs) multiplexed in frequency domain and a physical resource block (PRB) offset with respect to a first PRB of the BWP. The wireless device may further determine frequency resource indexes of the one or more ROs, in an increasing order starting from a first frequency resource index of the first RO. The wireless device may transmit a preamble via a second RO selected from the one or more ROs and determine a frequency resource index of the second RO based on the frequency resource indexes determined based on the frequency index offset applied to the first RO. The wireless device may receive, based on an RA identifier, a response to the preamble.