SRVCC Offload for LTE Congestion Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The growth of VoLTE subscriber bases leads to increased LTE cell congestion, resulting in call drops and blocked calls due to higher bandwidth requirements and lower delay tolerance compared to LTE data services.
Innovation Solution
Implementing a congestion control method that involves determining when an LTE network is congested and triggering a Single Radio Voice Call Continuity (SRVCC) offload procedure to switch VoLTE users from the LTE domain to a circuit-switched (CS) domain, managed by the Mobility Management Entity (MME) and E-UTRAN NodeB, to alleviate load and ensure quality of service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VoLTE subscribers are increased to provide high-definition audio and video services, then service quality and bandwidth utilization are improved, but LTE cell congestion increases leading to call drops and blocked calls
Solution Approach 1:
The patent extracts VoLTE users from the congested LTE domain and relocates them to the CS domain when congestion is detected. The MME identifies congested cells and triggers SRVCC handover to transfer specific VoLTE users to circuit-switched domain, thereby removing the harmful load from the LTE network while maintaining service continuity.
Solution Approach 2:
The patent introduces the MME as an intermediary that mediates between the LTE domain and CS domain. The MME monitors LTE network congestion status and acts as a gateway to trigger SRVCC handover procedures, coordinating the transition of VoLTE users between domains to balance load and maintain QoS.
2Productivity
If SRVCC handover is triggered to offload VoLTE users from LTE domain to CS domain, then LTE cell load is reduced, but network complexity and handover management overhead increase
Solution Approach 1:
The patent implements preliminary congestion detection and user identification before triggering SRVCC handover. The MME proactively monitors LTE cell congestion indicators and pre-identifies suitable VoLTE users for offloading based on QoS parameters and service type, preparing the handover list in advance to streamline the actual handover execution and reduce management overhead.
Solution Approach 2:
The patent establishes a feedback mechanism where the MME continuously monitors LTE network congestion status and QoS metrics, and adjusts SRVCC handover triggering decisions based on real-time network conditions. This closed-loop control optimizes the balance between load reduction and handover management complexity by adapting offloading decisions to current network state.
Data Source
AI summary
The embodiments of the present invention provide a congestion control implementation method and apparatus, where the method includes: determining one or more user equipments for which single radio voice call continuity (SRVCC) offloading needs to be performed; sending an SRVCC offload message to an E-UTRAN NodeB serving the one or more user equipments, so that when triggering an SRVCC handover procedure, the E-UTRAN NodeB switches the one or more user equipments from a Long Term Evolution (LTE) domain to a circuit switched (CS) domain. When the SRVCC handover procedure is completed, the one or more user equipments can be switched from VoLTE user equipments to VoCS user equipments. In this way, LTE cell load can be alleviated and QoS of the one or more user equipments can be guaranteed.