Service-Specific Backoff Mechanism for Random Access Latency
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Solution Overview
Problem
The 5G wireless communication systems face challenges in reducing user plane latency and optimizing backoff parameters for the random access procedure, which are critical for supporting enhanced Mobile Broadband (eMBB), massive Machine-Type Communications (mMTC), and Ultra-Reliable and Low Latency Communications (URLLC) services.
Innovation Solution
The introduction of multiple backoff parameters based on different services, numerology, transmission time interval (TTI) durations, and specific use cases allows for flexible adjustment of backoff times, enabling efficient random access procedures by considering factors like service type, RRC state, and failure duration, thereby reducing latency and improving congestion handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single backoff parameter is used for all services, then the system is simple to manage, but it cannot meet the diverse latency requirements of different services (eMBB, mMTC, URLLC)
Solution Approach 1:
The patent segments the unified backoff parameter into multiple service-specific backoff parameters (e.g., backoff parameter for eMBB, backoff parameter for URLLC, backoff parameter for mMTC). Each service type has its own dedicated backoff parameter that can be independently configured and adjusted according to specific service requirements, particularly latency requirements. This segmentation allows the system to provide differentiated backoff control for different services while maintaining independent management of each parameter set.
2Loss of time
If multiple backoff parameters are introduced for different services, then service-specific latency requirements can be met, but the complexity of the random access procedure increases
Solution Approach 1:
The patent implements dynamic selection of backoff parameters based on the service type of the uplink data. The system dynamically determines which backoff parameter to apply by identifying the service type (eMBB, URLLC, mMTC) of the data to be transmitted, and then selects the corresponding service-specific backoff parameter. This dynamic adaptation allows the system to optimize random access behavior for each service type without requiring manual configuration or complex static routing rules.
3Reliability
If longer backoff time is used, then congestion control is improved, but latency increases which affects delay-sensitive services like URLLC
Solution Approach 1:
The patent applies different backoff parameter values tailored to specific service types. For URLLC services, the system uses a first backoff parameter with a smaller value to minimize delay, while for eMBB services, it uses a second backoff parameter with a larger value to provide more aggressive congestion control. This local optimization ensures that each service type receives the appropriate level of congestion control without suffering from unnecessarily long delays, with URLLC traffic getting priority treatment through shorter backoff times.
Data Source
AI summary
Method and apparatus for a backoff mechanism applied for a random access procedure for a user equipment (UE) (e.g. mobile phone) in a wireless communication system are disclosed herein. The UE applies different backoff times for random access procedures based on different factors applicable to the UE. The UE may adjust the backoff time by an offset or a weighted value, and may derive an adjusted backoff time based on different backoff parameter values.