Dynamic Two-Step Random Access Selection for Non-Terrestrial Networks
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Solution Overview
Problem
Non-terrestrial wireless communication networks face challenges in supporting high reliability and low latency random access operations due to large propagation delays and varying conditions, such as high mobility of base stations and large round-trip delays, which affect the efficiency of random access procedures.
Innovation Solution
A communication device, such as a UE, is configured to select between a two-step and a four-step random access procedure based on various criteria, including reference signal received power, round-trip delay, and other network conditions, to optimize resource allocation and reduce latency, using specific bandwidth parts configured for multiple random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a four-step random access procedure is used in non-terrestrial networks, then reliability is improved, but latency increases due to large propagation delays
Solution Approach 1:
The patent implements dynamic selection between two-step and four-step random access procedures based on real-time network conditions, propagation delay measurements, and UE capabilities. The network can adaptively configure and switch between different RACH procedures to optimize both reliability and latency performance under varying non-terrestrial network conditions.
Solution Approach 2:
The patent changes key parameters including the number of message exchanges (2 vs 4 steps), timing advance values, and resource allocation configurations to adapt to different propagation delay conditions. By adjusting these parameters dynamically, the system achieves improved reliability without excessive latency penalty.
2Loss of time
If a two-step random access procedure is used to reduce latency, then latency is reduced, but reliability deteriorates under varying network conditions
Solution Approach 1:
The system dynamically selects between two-step and four-step procedures based on current network conditions, ensuring low latency when possible while maintaining reliability through fallback to four-step when conditions deteriorate. This dynamic adaptation resolves the contradiction by making the procedure selection context-dependent.
Solution Approach 2:
The patent incorporates feedback mechanisms where the network monitors random access success rates, propagation delay variations, and UE responses to determine whether to maintain two-step procedure or switch to four-step procedure. This feedback loop ensures reliability is maintained while minimizing latency.
3Adaptability or versatility
If multiple random access procedures are configured in a bandwidth part, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent configures a single bandwidth part to support multiple random access procedures (both two-step and four-step), making the BWP universal and multi-functional. This approach improves adaptability while controlling complexity by avoiding the need for separate BWP configurations for each procedure type.
Solution Approach 2:
The patent applies different random access procedure configurations within specific resource regions of the BWP, allowing localized optimization for different procedure types while maintaining overall BWP coherence. This local differentiation enables adaptability without requiring complete BWP reconfiguration.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A communication device, such as a user equipment (UE) may identify information for transmitting to a base station of a non-terrestrial network. The UE may identify that one or more resources allocated for transmitting the information are available based at least in part on identifying the information. The one or more resources include one or more types of uplink resources including physical random access channel (PRACH) resources or physical uplink shared channel (PUSCH) resources for the random access procedure, a PUSCH for a scheduling request (SR), or a physical uplink control channel (PUCCH) for a configured grant, or a combination thereof. As a result, the UE may transmit, to the base station, a message over the one or more resources allocated for the information based at least in part on identifying the one or more resources.