Two-Step Random Access Procedure for 5G Wireless Networks
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Solution Overview
Problem
Current random access procedures in wireless communication systems are inefficient, particularly in 5G networks, due to the high number of steps and delay periods involved, which can lead to increased response times and resource allocation challenges.
Innovation Solution
A two-step random access procedure is introduced, where a wireless communication device transmits a first message with a PRACH preamble sequence and a first message, and upon successful detection and decoding, a second transmission is made on a PDCCH addressed to a device-specific network identifier, reducing the number of steps and delay periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-step random access procedure is used, then reliability of connection establishment is improved, but response time and procedure duration increase
Solution Approach 1:
The patent combines multiple random access messages into a single transmission. Specifically, the user equipment transmits both the random access preamble and uplink data in one shot, and the base station responds with both random access response and downlink data in a single message, reducing the traditional 4-step procedure to a 1-shot procedure that maintains reliability while reducing time loss
2Ease of manufacture
If a multi-step random access procedure is used, then proper resource allocation can be achieved, but device complexity and procedure overhead increase
Solution Approach 1:
The patent applies preliminary action by allocating uplink resources in advance within the random access message itself. The base station includes uplink grant information in the random access response, allowing the user equipment to transmit data without waiting for additional scheduling messages, thereby simplifying the procedure while maintaining proper resource allocation
Data Source
AI summary
Wireless communication devices are adapted to facilitate a random access procedure. According to one example, scheduled entity can transmit a first transmission that is received by a scheduling entity. The first transmission may include a physical random access channel (PRACH) preamble sequence and a first message including information for determining a device-specific network identifier for the scheduled entity. The scheduling entity may transmit a second transmission that is received by the scheduled entity. The second transmission may include information on a physical downlink control channel (PDCCH) addressed to the device-specific network identifier for the scheduled entity, and a second message on a physical downlink shared channel (PDSCH). Other aspects, embodiments, and features are also included.