Random Access Resource Allocation for Reduced Capability Devices
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Solution Overview
Problem
Current mobile communication networks face challenges in efficiently managing and optimizing communication protocols across diverse wireless devices and base stations supporting multiple technologies, leading to suboptimal performance and resource utilization.
Innovation Solution
The implementation of advanced New Radio (NR) user plane and control plane protocol stacks, along with flexible bandwidth management and carrier aggregation techniques, enables efficient communication by optimizing protocol layers and resource allocation across various wireless devices and base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional random access procedures are used for reduced capability devices, then device compatibility is maintained, but communication efficiency and resource utilization deteriorate
Solution Approach 1:
The patent implements dynamic random access procedures where the network can configure different RA types (two-step or four-step) based on device capability and network conditions. Reduced capability devices can use optimized two-step RA procedures when supported, while maintaining compatibility with conventional four-step procedures, thereby adapting the access method to device capabilities and improving overall communication efficiency
Solution Approach 2:
The patent changes key parameters of the random access procedure including message structure (MsgA/MsgB vs Msg1/Msg2/Msg3/Msg4), resource allocation patterns, and timing configurations. By modifying these parameters based on device capability indicators, the system achieves improved resource utilization and communication efficiency for reduced capability devices while maintaining backward compatibility
2Productivity
If resource allocation is optimized for specific device types, then resource utilization improves, but device complexity increases
Solution Approach 1:
The patent enables devices to self-identify their capability type and select appropriate random access procedures autonomously. Reduced capability devices include capability indicators in their messages and automatically use optimized resource allocation patterns when detected, eliminating the need for complex network-side device classification and reducing overall system complexity
Solution Approach 2:
The patent segments the random access procedure into distinct capability-based paths (two-step RA for reduced capability devices, four-step RA for conventional devices). Each path has optimized resource allocation, allowing the system to improve resource utilization for specific device types without requiring all devices to handle complex unified protocols
Data Source
AI summary
In some embodiments, a wireless device, having reduced processing capabilities, receives at least one system information block (SIB) indicating common random access resources for: first wireless devices with the reduced processing capabilities, and second wireless devices without the reduced processing capabilities. A preamble is transmitted using the common random access resources. A response to the preamble is received that indicates a physical uplink shared channel (PUSCH) resource including: a first demodulation reference signal (DMRS) resource for the first wireless devices, and a second DMRS resource for the second wireless devices. Based on the common random access resources and based on the wireless device having the reduced processing capabilities, the first DMRS resource is selected from the first DMRS resource and the second DMRS resource. Based on the selected first DMRS resource, uplink data is transmitted via the PUSCH resource.