Wireless Access Congestion Mitigation via UE Category Segmentation
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Solution Overview
Problem
Wireless communication systems experience congestion when multiple devices contend for sparse random access resources, leading to issues like data network failures, poor quality of service, and user experience degradation.
Innovation Solution
The described techniques involve a user equipment (UE) receiving a network access control broadcast with access control criteria, determining its access category and identity, and selectively performing a random access procedure in accordance with these criteria to mitigate access congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices contend for sparse random access resources, then the wireless network can support multiple users, but access congestion occurs leading to data network failures and poor quality of service
Solution Approach 1:
The patent segments the random access procedure into multiple categories based on device types and access priorities. Different UEs are assigned to different access categories (e.g., category 0 for normal UEs, category 1 for reduced capability UEs) with specific access identities. This segmentation allows the network to handle different device types separately, preventing congestion from affecting all users equally and improving overall access reliability.
Solution Approach 2:
The patent applies local quality by assigning different access control criteria to different UE categories. Reduced capability UEs have specific access identities and categories that differentiate their access behavior from normal UEs. This localized differentiation allows the network to optimize access control for specific device types without affecting other users, thereby maintaining reliability while supporting diverse device capabilities.
2Adaptability or versatility
If reduced capability UEs are allowed to access the network, then device compatibility is improved, but access congestion increases due to their specific access requirements
Solution Approach 1:
The patent segments UEs into different categories based on capability, specifically creating category 1 for reduced capability UEs with access identity 1. This segmentation allows reduced capability UEs to access the network without interfering with normal UEs, maintaining device compatibility while managing their access efficiency through category-specific control criteria.
Solution Approach 2:
The patent changes access control parameters specifically for reduced capability UEs by assigning them access identity 1 and category 1, with modified access control criteria. This parameter differentiation allows the network to optimize access procedures for reduced capability devices, balancing compatibility with access efficiency by preventing them from contending for the same resources as normal UEs.
3Speed
If random access procedures are performed without access control criteria, then access speed is improved, but system latency increases due to retransmissions during congestion
Solution Approach 1:
The patent applies preliminary action by having UEs determine their access category and identity before performing the random access procedure. The network broadcasts access control criteria in advance, and UEs use this information to select appropriate access parameters beforehand. This preliminary classification prevents congestion-related retransmissions by ensuring UEs use appropriate access channels from the start, thereby maintaining access speed while reducing system latency.
4Reliability
If access control criteria are enforced, then access congestion is mitigated, but device complexity increases due to category and identity determination
Solution Approach 1:
The patent applies homogeneity by using a standardized access category and identity framework that all UEs must follow. Despite different device types, all UEs determine their category and identity using the same procedure and broadcast the same type of access control information. This homogeneous approach simplifies implementation across diverse devices while maintaining effective congestion mitigation through category-based control.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The method includes receiving a network access control broadcast including access control criteria associated with connecting to a base station, determining an access category associated with the UE and an access identity of the UE associated with the access category, where the access category of the UE is specific to a reduced capability classification of the UE, and selectively performing a random access procedure to connect to the base station in accordance with the access control criteria, the access identity of the UE, and the access category associated with the UE.