PRACH Resource Selection for Extended-Coverage Initial Access
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Solution Overview
Problem
The existing PRACH configuration methods in 5G NR are inefficient due to imbalanced UE distribution and extended coverage, leading to limited overall efficiency and failed access attempts by UEs in far regions, especially in scenarios with additional entities like relays or repeaters, and non-terrestrial networks.
Innovation Solution
Implementing multiple PRACH resource configurations with differentiated preamble formats, frequency and time-domain settings, priority levels, and back-off mechanisms to optimize random access processes, allowing UEs to select appropriate configurations based on capability and network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single PRACH configuration is used for all UEs, then device complexity is reduced, but access reliability deteriorates for UEs in far regions due to imbalanced UE distribution and extended coverage requirements
Solution Approach 1:
The patent segments the unified PRACH configuration into multiple UE-specific configurations based on UE capabilities and coverage requirements. Each UE is assigned a specific PRACH configuration from a set of configured options, allowing tailored access parameters for different UE types and coverage scenarios while maintaining manageable system complexity through standardized configuration sets.
Solution Approach 2:
The patent introduces dynamic selection of PRACH configurations based on UE capability indicators and network conditions. The gNB configures multiple PRACH options and UEs dynamically select appropriate configurations based on their capability assessments, enabling adaptive access reliability without requiring static complex configuration for all possible scenarios.
2Productivity
If multiple PRACH resource configurations are implemented with differentiated settings, then access efficiency for varied coverage scenarios is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by configuring different PRACH parameters (preamble formats, frequency resources, time resources, power settings) specifically tailored to each UE's capability and coverage scenario. This allows optimized access efficiency for each UE type while the gNB manages the overall configuration set, distributing the complexity burden rather than requiring each UE to handle all possible configurations.
Solution Approach 2:
The patent utilizes parameter changes by providing UEs with multiple PRACH configuration options that vary key parameters such as preamble format, subcarrier spacing, cyclic prefix length, and power settings. UEs select configurations with parameters matched to their capability indicators, achieving high access efficiency without requiring devices to manage all parameter combinations simultaneously.
3Reliability
If PRACH resources are allocated without prioritization, then resource allocation simplicity is maintained, but access reliability deteriorates for high-priority UEs in extended coverage scenarios
Solution Approach 1:
The patent implements preliminary action by pre-configuring priority levels and associated PRACH parameters for different UE types before the actual random access procedure. The gNB provides UE-specific configurations that include priority-based resource allocations and power settings in advance, ensuring high-priority UEs have optimized access parameters ready without requiring complex real-time priority management during the access process.
Data Source
AI summary
Systems and methods for wireless communication systems are disclosed. In one aspect, the wireless communication method includes identifying, by a wireless communication device, a plurality of Physical Random Access Channel (PRACH) resource configurations. The method includes sending, by the wireless communication device to a wireless communication node, based on a selected one of the plurality of PRACH resource configurations, a first message to initiate a random access process.