Downlink RRC Message Transmission in 2-Step Random Access
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in the 2-step random access procedure, particularly in the transmission of downlink radio resource control (RRC) messages, which are not adequately resolved for 2-step random access protocols.
Innovation Solution
The proposed solution involves transmitting a first downlink RRC message from a network to a wireless device using either unicast or group-cast transmission methods within the context of a 2-step random access procedure, allowing for efficient communication by indicating successful random access and configuring connection settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If 2-step random access procedure is implemented, then access speed is improved, but message transmission reliability deteriorates
Solution Approach 1:
The downlink RRC message transmission is segmented into two independent paths: unicast transmission for reliable device-specific messaging and groupcast transmission for efficient batch messaging. This segmentation allows the system to maintain fast 2-step random access while ensuring message reliability through appropriate path selection based on message type and target device characteristics.
Solution Approach 2:
The system dynamically changes transmission parameters including modulation and coding schemes, transmission power, and resource allocation based on channel conditions and device states. This enables adaptive optimization of message transmission reliability while maintaining the speed benefits of 2-step random access procedure.
2Reliability
If unicast transmission is used for downlink RRC messages, then message reliability is improved, but network overhead increases
Solution Approach 1:
The network employs a universal transmission framework that can handle both unicast and groupcast messages through a unified resource allocation and scheduling mechanism. This multi-functionality allows the system to select the most efficient transmission mode for each message, reducing overall network overhead while maintaining reliability where needed.
Solution Approach 2:
Instead of applying unicast transmission to all downlink RRC messages, the system applies it only partially to messages where high reliability is critical. Groupcast transmission handles the majority of messages, significantly reducing network overhead while maintaining adequate reliability for non-critical communications.
3Productivity
If groupcast transmission is used for downlink RRC messages, then network efficiency is improved, but individual device reception reliability deteriorates
Solution Approach 1:
The system implements feedback mechanisms where devices acknowledge receipt of groupcast messages. The network monitors these acknowledgments and can trigger retransmissions or switch to unicast for devices that fail to receive messages correctly. This feedback loop maintains individual device reception reliability while preserving the network efficiency benefits of groupcast transmission.
Solution Approach 2:
The system prepares cushioning measures by pre-configuring fallback transmission modes and retransmission resources. When groupcast transmission is used, the network has pre-arranged unicast fallback paths ready to ensure individual device reception reliability if the groupcast message is not successfully received, without compromising normal network efficiency.
Data Source
AI summary
Apparatuses, systems, and methods for a wireless device to perform 2-step random access procedures. The disclosure identifies techniques for transmitting and receiving downlink connection configuration information, such as a radio resource control message, in a 2-step random access procedure.