Grant-Free Random Access Identity Reporting for IoT Uplinks
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Solution Overview
Problem
In IoT communication scenarios with grant-free scheduling, terminals face challenges in determining the appropriate user identity to report during random access procedures due to varying link quality, leading to inefficiencies and potential failures in data transmission.
Innovation Solution
The method specifies that the user identity reported during random access in grant-free scheduling is explicitly an International Mobile Subscriber Identity (IMSI) or a preconfigured Cell Radio Network Temporary Identity (C-RNTI), allowing for clear identification and enabling efficient communication by ensuring proper PDCCH scrambling and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grant-free scheduling is used to reduce signaling overhead and avoid power waste, then communication efficiency is improved, but the terminal cannot successfully transmit data when link quality changes
Solution Approach 1:
The network device preconfigures scheduling resources and C-RNTI for the terminal in advance, allowing the terminal to transmit data without performing random access or receiving uplink scheduling grants under normal conditions. This preliminary configuration enables efficient grant-free transmission while maintaining the ability to revert to random access procedures when link quality deteriorates, thus resolving the contradiction between communication efficiency and transmission reliability.
2Reliability
If the terminal performs random access to re-access the network when link quality changes, then data transmission reliability is improved, but signaling overhead increases and power is wasted
Solution Approach 1:
The network device preconfigures scheduling resources and C-RNTI for the terminal in advance, allowing the terminal to transmit data without performing random access or receiving uplink scheduling grants under normal conditions. This preliminary configuration enables efficient grant-free transmission while maintaining the ability to revert to random access procedures when link quality deteriorates, thus resolving the contradiction between communication efficiency and transmission reliability.
3Reliability
If the terminal reports user identity during random access procedure, then network authentication is improved, but the process becomes more complex when determining appropriate identity
Solution Approach 1:
The network device preconfigures C-RNTI for the terminal in advance as part of the grant-free scheduling setup. When the terminal needs to perform random access due to link quality changes, it can directly use this preconfigured C-RNTI as the user identity in the random access procedure, eliminating the complexity of determining which identity to report while maintaining reliable network authentication.
Data Source
AI summary
A random access method is provided. The method is applied to a terminal in a grant-free scheduling state. The terminal in the grant-free scheduling state is in a non-connected state, and data is transmitted on a resource pre-configured by a network device for the terminal at a designated transmission opportunity when the data is required to be transmitted. The method includes: transmitting a message 3 on a random access resource; and reporting a user identifier in the message 3, where the user identifier includes an international mobile subscriber identity (IMSI) or a pre-configured cell-radio network temporary identifier (C-RNTI).