Two-Step Random Access DRX Timing for NR Response Monitoring
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in the random access procedure, particularly in the context of New Radio (NR) networks, leading to suboptimal resource utilization and increased latency during device connection establishment.
Innovation Solution
The implementation of a discontinuous reception (DRX) mechanism in the random access procedure, allowing wireless devices to selectively activate and deactivate reception modes based on specific criteria, optimizing resource usage and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous reception mode is used during random access procedure, then reliability of message reception is improved, but energy consumption increases and resource utilization decreases
Solution Approach 1:
The patent implements discontinuous reception (DRX) cycles where the wireless device alternates between active reception periods and sleep periods. During the random access procedure, the device monitors for messages (MSG2, MSG4) only during specific active windows within DRX cycles, rather than continuously. This periodic action reduces energy consumption while maintaining reliable reception by ensuring the device is awake during critical message transmission windows.
2Reliability
If continuous reception mode is used during random access procedure, then reception reliability is improved, but resource utilization decreases
Solution Approach 1:
The DRX mechanism creates structured active windows within periodic cycles, allowing the network to schedule random access messages (MSG2, MSG4) during these predetermined active periods. This improves resource utilization by concentrating transmissions during times when devices are guaranteed to be monitoring, rather than requiring continuous monitoring across all time periods.
Solution Approach 2:
The network configures DRX parameters and active window timings in advance before the random access procedure begins. This preliminary configuration allows both the network and devices to plan message transmissions and monitoring schedules ahead of time, optimizing resource allocation and ensuring devices are awake at the right moments without requiring continuous reception.
3Use of energy by moving object
If discontinuous reception is implemented, then energy consumption is reduced and resource utilization is improved, but device complexity increases
Solution Approach 1:
The wireless device autonomously manages its own DRX cycle timing and active window scheduling based on pre-configured parameters. The device independently determines when to wake up and monitor for messages without requiring continuous network control or complex coordination, thereby reducing overall system complexity while achieving energy savings.
Data Source
AI summary
A wireless device receives one or more radio resource control (RRC) messages comprising one or more configuration parameters for a two-step random access (RA) procedure. The wireless device transmits, based on the one or more configuration parameters and for the two-step RA procedure, a message comprising a preamble and a transport block. The wireless device starts, at least one symbol after a last symbol of a transmission occasion of the transport block, a time window for monitoring a downlink control channel for a response of the message. The wireless device receives the response during a discontinuous reception (DRX) active time of a DRX operation of the wireless device. The DRX active time comprises a time during the time window. The time window stops in response to receiving the response.