IRAAC Module for LTE Random Access Admission Control
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Solution Overview
Problem
The existing call admission control mechanisms in LTE wireless broadband networks face inefficiencies, particularly in initial random access admission control, leading to increased signaling load and poor Quality of Service (QoS) due to ineffectual traffic session grants, which overwhelm base stations and degrade network performance.
Innovation Solution
Implementing an Initial Random Access Admission Control (IRAAC) module within the eNB that evaluates RACH-Preamble signals against predetermined threshold requirements, including signal characteristics and network capacity, to intelligently manage admission requests and reject excessive connections, thereby optimizing resource allocation and reducing network overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If initial random access admission control grants traffic session access to mobile devices, then network connectivity and user access are improved, but signaling load and base station processing overhead increase
Solution Approach 1:
The patent applies preliminary action by performing admission control evaluation at the RACH-Preamble stage before full RRC connection establishment. The base station assesses whether to admit the mobile device at this early point, preventing unnecessary signaling progression for devices that will ultimately be rejected, thus reducing overall signaling load while maintaining access functionality
Solution Approach 2:
The patent segments the admission control process into distinct stages: RACH-Preamble level assessment and RRC connection level assessment. This segmentation allows the base station to make quick filtering decisions at the Preamble stage based on establishment cause and current load, separating the heavy processing from devices that pass initial screening
2Ease of operation
If the base station admits all RACH-Preamble requests, then mobile device connectivity is improved, but network performance and QoS deteriorate due to overload
Solution Approach 1:
The patent applies preliminary anti-action by proactively rejecting RACH-Preamble requests from devices with unfavorable establishment causes or when network load is high, before these devices can consume network resources. This preemptive rejection prevents the harmful effect of overload while maintaining connectivity for legitimate users
Solution Approach 2:
The patent changes the admission control parameters by introducing establishment-cause-based filtering and load-dependent threshold adjustments at the RACH-Preamble stage. The base station dynamically adjusts acceptance criteria based on current network conditions and the specific establishment cause, transforming static admission control into a dynamic parameter-based system
3Productivity
If the base station performs detailed admission control at RACH-Preamble stage, then signaling load is reduced, but processing complexity and decision accuracy requirements increase
Solution Approach 1:
The patent applies local quality by implementing different levels of admission control scrutiny at different stages. At the RACH-Preamble stage, the base station performs lightweight assessment based on establishment cause and basic load conditions. For devices that pass this initial screening, full detailed admission control is applied at the RRC connection stage, optimizing the balance between early filtering and thorough evaluation
Data Source
AI summary
A method, system, and non-transitory computer-readable storage medium for providing admission control in a wireless network are provided. The method may include receiving a RACH-Preamble from a mobile device and determining whether a first set of requirements is satisfied for the received RACH-Preamble. The method may further include transmitting a first response to the mobile device when the first set of requirements is satisfied and receiving a RRC connection request from the mobile device after transmitting the first response. The method may further include determining an establishment cause of the RRC connection request and determining whether a second set of requirements corresponding to the establishment cause are satisfied. The method may further include rejecting the RRC connection request when the second set of requirements is not satisfied.