Two-Step Random Access Procedure Latency Reduction
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Solution Overview
Problem
Existing technologies face challenges in efficiently managing bandwidth parts and carrier aggregation in multicarrier communication systems, particularly in activating, deactivating, and switching bandwidth parts.
Innovation Solution
The implementation of advanced radio access network (RAN) architectures and protocols, including bandwidth part management and carrier aggregation techniques, enables efficient operation of bandwidth parts and carrier aggregation in multicarrier communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If four-step random access procedure is used, then access reliability is improved, but access latency increases
Solution Approach 1:
The patent segments the random access procedure into two distinct types: four-step random access procedure (for high reliability) and two-step random access procedure (for low latency). This segmentation allows the system to choose the appropriate procedure based on access requirements, resolving the contradiction between reliability and latency by not using a single monolithic procedure.
Solution Approach 2:
The patent introduces dynamic switching capability between four-step and two-step random access procedures based on network conditions and access requirements. The gNodeB can dynamically select which procedure to use, making the system adaptable to different scenarios and resolving the fixed trade-off between reliability and latency.
2Loss of time
If two-step random access procedure is used, then access latency is reduced, but access reliability deteriorates
Solution Approach 1:
The patent segments the random access procedure into two distinct types: four-step random access procedure (for high reliability) and two-step random access procedure (for low latency). This segmentation allows the system to choose the appropriate procedure based on access requirements, resolving the contradiction between reliability and latency by not using a single monolithic procedure.
Solution Approach 2:
The patent introduces dynamic switching capability between four-step and two-step random access procedures based on network conditions and access requirements. The gNodeB can dynamically select which procedure to use, making the system adaptable to different scenarios and resolving the fixed trade-off between reliability and latency.
3Adaptability or versatility
If bandwidth part activation and deactivation is implemented, then network flexibility is improved, but system complexity increases
Solution Approach 1:
The patent segments the bandwidth management into distinct operations: activation, deactivation, and switching of bandwidth parts. This segmentation allows for targeted control and optimization of each operation, improving flexibility while managing complexity through structured procedures.
Solution Approach 2:
The patent implements preliminary configuration and signaling mechanisms for bandwidth part activation and deactivation. By preparing and signaling these operations in advance, the system reduces runtime complexity and enables more flexible bandwidth management without proportionally increasing system complexity.
Data Source
AI summary
A wireless device may receive a random access response based on transmitting a first random access preamble, wherein the random access response comprises an uplink grant. The wireless device may transmit, via the uplink grant, a Msg3 message comprising a wireless device identifier of the wireless device. Based on not receiving a response to the Msg3, the wireless device may transmit a message comprising a second random access preamble and a transport block.