HARQ Feedback Repetition for Adaptive NR Random Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing random access procedures and beam management in New Radio (NR) networks, particularly in scenarios involving multiple technologies and varying network releases, leading to suboptimal performance and resource inefficiencies.
Innovation Solution
Implementing a flexible and configurable mechanism for random access procedures and beam management in NR networks, allowing for selective implementation based on criteria such as device capabilities, traffic load, and network configurations, and supporting multiple technologies and releases, including LTE and 5G.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed and rigid random access procedure is implemented in NR networks, then the system maintains simplicity and ease of operation, but it cannot adapt to diverse device capabilities and traffic conditions, leading to suboptimal performance
Solution Approach 1:
The patent implements dynamic random access procedures where the network can selectively enable or disable specific random access types (contention-based, contention-free, 2-step, 4-step) based on real-time device capabilities, traffic load, and network conditions. This dynamic configuration allows the system to adapt to varying requirements without maintaining a single rigid procedure for all scenarios.
Solution Approach 2:
The system changes operational parameters of the random access mechanism by configuring different random access types and their associated parameters (such as preamble formats, resource allocations, and timing) based on device capabilities and network conditions. This parameter adaptation enables optimized performance for different device types and traffic conditions while maintaining a unified underlying framework.
2Productivity
If multiple random access types and beam management procedures are supported simultaneously, then the system achieves higher productivity and performance optimization, but it increases device complexity and difficulty of operation
Solution Approach 1:
The patent implements self-service mechanisms where user equipment automatically selects and executes the appropriate random access procedure and beam management strategy based on pre-configured capabilities and current network conditions. The device autonomously determines whether to use contention-based or contention-free access, and selects appropriate beam configurations without requiring complex manual intervention or centralized control for each decision.
Solution Approach 2:
The system performs preliminary configuration of multiple random access types and beam management parameters during network setup and device registration. Capability information, supported random access types, and beam configurations are pre-established and stored, enabling rapid selection and execution during actual random access events without requiring complex real-time decision-making or manual configuration during operation.
3Adaptability or versatility
If legacy LTE random access procedures are maintained for compatibility, then the system ensures backward compatibility and ease of manufacture, but it prevents optimization for 5G NR specific requirements and reduces adaptability
Solution Approach 1:
The patent implements a universal random access framework that can accommodate multiple access types (contention-based, contention-free, 2-step, 4-step) and serve multiple functions including legacy LTE compatibility and 5G NR optimization. The same underlying MAC layer infrastructure supports both legacy and advanced procedures, allowing the system to maintain backward compatibility while enabling 5G-specific optimizations through selective activation of appropriate procedures.
Solution Approach 2:
The system segments the random access functionality into distinct, independently configurable procedures (legacy 4-step, new 2-step, contention-based, contention-free). Each segment can be independently enabled or disabled based on network requirements and device capabilities. This segmentation allows legacy LTE procedures to coexist with 5G NR optimizations without interference, maintaining compatibility while enabling advancement.
Data Source
AI summary
A wireless device receives radio resource control (RRC) messages indicating repetition numbers for hybrid automatic repeat request (HARQ) feedback for messages of a random access (RA) procedure, and second repetition numbers for transmission of a preamble for the RA procedure. The wireless device determines, for the RA procedure: an RA type from a 4-step RA type and a 2-step RA type, based on a reference signal received power (RSRP) and a first RSRP threshold; and a second repetition number from the second repetition numbers based on the RSRP and one or more second RSRP thresholds. The wireless device transmits the preamble with the second repetition number and receives downlink control information (DCIs): scheduling the messages of the RA procedure; and comprising a bit field indicating a repetition number for the HARQ feedback. The wireless device receives the messages and transmits the HARQ feedback with the repetition number.