2-Step Random Access Common Recognition Information Generation
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Solution Overview
Problem
The 2-step random access procedure in communication systems, aimed at reducing communication delay, faces issues where the transmission of message 3 may not be successful due to the lack of terminal ID recognition, forcing devices to revert to the conventional 4-step procedure and compromising communication performance.
Innovation Solution
A communication device generates common recognition information using predetermined information, such as resource details, to enable successful transmission of message 3 in the 2-step random access procedure, allowing the base station to decode and recognize terminal devices without assigned IDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the 2-step random access procedure is introduced to reduce communication delay, then communication speed is improved, but transmission reliability deteriorates because message 3 transmission may fail due to lack of terminal ID recognition
Solution Approach 1:
The base station performs preliminary actions by generating and transmitting downlink control information that includes resource allocation for message 3 transmission before the actual message 3 transmission occurs. This preliminary setup ensures that the terminal device has the necessary resource information ready, enabling successful transmission without requiring terminal ID recognition in the traditional sense.
Solution Approach 2:
Downlink control information acts as an intermediary mechanism between the base station and terminal device. Instead of relying on terminal ID recognition, the downlink control information carries resource allocation details that mediate the message 3 transmission process, allowing the terminal to successfully transmit without traditional ID-based authentication.
2Loss of time
If the 2-step random access procedure is used to reduce delay, then time efficiency is improved, but device complexity increases due to the need for generating and managing common recognition information
Solution Approach 1:
The downlink control information serves multiple functions: it allocates resources for message 3 transmission, provides timing information, and enables the terminal device to generate common recognition information. This multi-functionality reduces the need for separate mechanisms, thereby limiting the increase in device complexity while achieving time efficiency.
Solution Approach 2:
The system changes the parameter approach from using terminal IDs to using resource allocation information from downlink control information. This parameter change allows the terminal device to generate common recognition information based on resource details rather than traditional identifiers, managing complexity through parameter transformation.
3Speed
If terminal devices transmit message 3 in the initial step of 2-step random access, then communication speed is improved, but transmission success rate deteriorates due to lack of terminal ID recognition by base station
Solution Approach 1:
The base station provides feedback through downlink control information that includes resource allocation for message 3 transmission. This feedback mechanism ensures that the terminal device receives the necessary information to successfully transmit message 3, improving transmission success rate while maintaining communication speed.
Solution Approach 2:
The base station performs preliminary action by pre-allocating resources and transmitting downlink control information before the message 3 transmission. This preliminary preparation ensures that when the terminal device transmits message 3, the base station already has the necessary resource information, guaranteeing transmission success while maintaining high speed.
Data Source
AI summary
A communication device includes an obtaining unit that obtains predetermined information which is different than terminal IDs enabling identification of each of a plurality of communication devices with which another communication device performs radio communication; and a generating unit that, based on the predetermined information, generates common recognition information to be shared with the other communication device.