Random Access Msg3 Resources for Bandwidth-Limited Terminals
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Solution Overview
Problem
Terminal devices with limited bandwidth, such as NR light devices or REDCAP devices, face challenges in sending the Msg3 message during the random access procedure due to the bandwidth of the initial BWP exceeding their channel bandwidth, leading to failed access attempts.
Innovation Solution
The method involves determining and utilizing resources with bandwidths that match or are less than the terminal device's channel bandwidth for sending the Msg3 message, and adjusting subcarrier spacing to accommodate these devices, thereby allowing them to successfully access the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the bandwidth of the resource for carrying Msg3 is configured to reach the bandwidth of the initial BWP (20 Mbps), then the network device can achieve high data transmission capacity, but terminal devices with limited channel bandwidth (5-10 Mbps) cannot send Msg3, resulting in failed random access
Solution Approach 1:
The patent segments the Msg3 transmission resource into multiple parts with different bandwidths. Specifically, it divides the initial BWP into a first BWP with a first bandwidth and a second BWP with a second bandwidth, where the first bandwidth is less than or equal to the channel bandwidth of bandwidth-limited terminal devices. This segmentation allows terminal devices to select appropriate bandwidth resources matching their capabilities.
Solution Approach 2:
The patent changes the bandwidth parameter of the Msg3 transmission resource to accommodate different terminal device capabilities. By configuring multiple BWPs with different bandwidths (first BWP with smaller bandwidth for bandwidth-limited devices, second BWP with larger bandwidth for normal devices), the system adapts the resource parameters to match the terminal's channel bandwidth, enabling successful random access for all device types.
2Productivity
If a single large bandwidth resource is allocated for Msg3 transmission, then resource utilization efficiency is high, but bandwidth-limited terminal devices cannot access the network, reducing overall access success rate
Solution Approach 1:
The patent makes the Msg3 transmission resource universal by creating multiple BWPs that can serve different types of terminal devices. The first BWP serves bandwidth-limited terminal devices, while the second BWP serves normal terminal devices with larger channel bandwidth. This multi-functionality ensures that resources are efficiently utilized across diverse device types while maintaining high random access success rates for all devices.
Data Source
AI summary
This disclosure relates to a communication method and apparatus. A first terminal device determines a first resource. The first terminal device sends a first random access message on the first resource. A bandwidth of the first resource is less than or equal to a channel bandwidth of the first terminal device. The channel bandwidth of the first terminal device is less than or equal to a channel bandwidth of a second terminal device. The channel bandwidth of the second terminal device is greater than or equal to a first bandwidth. The first bandwidth is configured by a network device. For example, the first random access message is a Msg3 or a MsgA.