At the eNB level, this can be seen as an abnormal release which is verified from the cause code inside the Context Release message. The most common drop pegged under Radio issues is the drop due to RLC retransmissions. Some vendors initiate a UE Context Release at this point resulting in an abnormal release and a call drop.

Top 10 E2E VoLTE deployment considerations

This issue is mostly due to coverage and quality problems. So, the best way to sort this out is to improve radio conditions which is usually done with physical optimization. Increasing RLC retransmission threshold to a higher value might also help in reducing this issue. Consider a scenario, where UE tries to perform a handover and fails. Such a case is pegged under call drop due to Handover failure. The most common issue for this kind of failure is when the target cell is very far away such that when the UE initiates handover on the target cell, it is at a distance beyond the cell radius.

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So, in this case, either increase the cell radius of the target cell or downtilt it so that it does not overshoot beyond its planned radius. This can also happen in areas where there are large water bodies as signals easily tend to get reflected over water.

In such cases, either forbid handovers to such cells or add offsets for those cells to make handovers difficult. This timer is usually a large value, so such a drop is rare. Point to note is that RRC Reconfiguration for mobility command is excluded from this mechanism as the UE needs to send its response to the target cell and not to the source cell.

LTE Basic Parameters

The expiry of this timer means that the UE has been inactive for some time and the eNB releases it. The UE goes to idle mode and the eNB pegs a normal release. The Call Drop Rate is ratio of total abnormal releases to the total normal releases. So, if the UE Inactivity timer is a small value, there will be a greater number of normal releases which can artificially reduce the CDR.

In short, while benchmarking two different networks, it is important to verify that they have the same UE Inactivity Timer value so that they can be compared properly. However, reducing the inactivity timer can cause an increase in RRC signalling so it should not be reduced excessively.

The MME drops are usually caused by radio issues but they are pegged under MME drops because the eNB has no way of knowing that the drop was caused by a radio issue.

volte optimization parameters

Lets understand with help of different cases that are pegged under MME induced drops. However, in reality, such a release is caused by a failure over the radio interface but the eNB1 does not have this knowledge. Increasing the uplink RLC retransmission threshold can help reduce such failures. For instance, if the RLC retransmission count threshold is increased from 8 to 16, then the RLC will retransmit 16 times instead of 8 times which will increase the probability that the eNB might be able to decode the message and prevent RLF.

However, from here onwards, it is a sliding window with 10ms granularity.

volte optimization parameters

For instance, if the value of N is increased from 2 to 6 and T is increased from ms to ms, then the UE will wait longer and there is more chance that N will be triggered. N is the In-Sync value and so it is the opposite of N T stops if N is triggered. So, there is a higher probability of triggering N if the value of N and T is big. But the user perception can be impacted so it should be tuned accordingly.The launch of a new service brings new opportunities for operators to generate revenue, boost quality of service, and retain, customers with an exclusive or innovative offering.

With the promise of high quality and high definition voice calls to customers, VoLTE Voice over LTE is one service that can provide a fertile ground for operators looking to differentiate. But launching and supporting VoLTE is not always as straightforward for operators as it may seem. However, as with other new services, the challenges presented by the launch of VoLTE can be very different in developed and developing markets. VoLTE is a data service, and so the RAN design must be optimized to the right levels for it to deliver the right quality.

However, whereas a normal data call can be throttled down if the subscriber is in an area of low quality high interferencea VoLTE call has a guaranteed rate of service. This means that, if the quality of the network is anything less than average, the demands of VoLTE calls can grow exponentially and this can result on a few users rapidly hogging a lot of the capacity available in a cell.

This is an indication sent from the user device to the network, with CQI 15 representing the best quality and CQI 1 the worst. When the handset reports low conditions the network responds, but it does so differently for data than for VoLTE services. This causes the overall quality of the network to decrease.

This puts specific pressure on LTE-only networks, because, without the luxury of a 3G network to fall back on, demand from VoLTE calls creates a massive capacity issue. They must get the RAN fundamentals right, as well as ensuring that the network is better than average. Otherwise VoLTE will have a negative effect on overall quality.

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Optimizing the core In developed markets, any challenges inherent in VoLTE deployment are very different because networks have been established for longer, and there is a better overall understanding of LTE. The biggest difference is when the network is of a high quality. Challenges can also arise between domains, where it can be difficult to pin point the root cause of issues — their location and whether it was the device, the RAN, the EPC, or the IMS. In order for operators to reap the benefits that VoLTE in both developing and developed markets can bring, preparation and planning is key.

To successfully launch and support VoLTE, operators need to plan for a range of network performance issues. After all, the right mobile network planning and optimization steps will play a central role in delivering a high-quality VoLTE experience for subscribers. This website uses cookies: Please read our privacy policy and cookie policy for full details. I am happy for this website to use cookies.

Optimizing for VoLTE: overcoming the challenges facing operators. Want to hear more? Contact Us.Cell load percentage in a cell is usually measured by number of users divided by max limit of eNB. VoLTE optimization process and steps include: performance optimization options, QoS requirements for VoLTE, LTE capacity planning and dimensioning, end user quality optimization, voice priority, third party applications, scheduling, header compression etc. It covers VoLTE coverage and capacity optimization.

Automated optimization of coverage, capacity, mobility performance of wireless networks do not only allow mobile users to enjoy HD voice and high speed broadband services. IMS Analysis and optimization includes: probe based analysis, timer optimization, release cause analysis, IP network consistency check.

This certification validates your expertise and skills and is recognised worldwide. Our Certifications and skills will set you apart from the competition and help you get a new Job. This course has been designed and delivered by Telecom Industry Experts. The course starts now and never ends!

It is a completely self-paced online course available 24x7 - you decide when you start and when you finish. How does lifetime access sound? After enrolling, you have unlimited lifetime access to this course for as long as you like - across any and all devices you own.

We would never want you to be unhappy! If you are unsatisfied with your purchase, contact us in the first 30 days and we will give you a full refund. VoLTE Optimization. Course Curriculum. Download PDF content Available in days. This course includes 24x7 On-demand video Full lifetime access Access on any device Certification. Frequently Asked Questions When does the course start and finish? How long do I have access to the course? What if I am unhappy with the course?

Get Started. Select a pricing plan and sign up. Enroll in course.VoLTE deployment is unprecedented in its complexity and a great challenge to carrier networks and telco business transformation.

This article details the ten most important deployment considerations. Through its provision of rich service experiences to end users, VoLTE is crucial to next-generation convergent communications. They are also jointly promoting the construction of VoLTE roaming networks that will offer seamless roaming on a global scale.

IP multimedia subsystem IMS supports a variety of access types and multimedia services. The IMS core network is responsible for access control, call routing, and service triggering. Its location on the VoLTE network has a great impact on user experience, so deployment efficiency and engineering efficiency must be considered during centralized SBC deployment, with the traffic switching efficiency warranting consideration during distributed SBC deployment.

If they share an APN, deployment is easy, but voice could be impacted by data services. When the sharing APN solution is used, voice call-related traffic must be separated from data traffic by the IMS charging identifier ICID as voice calls are charged by call duration while data services are charged by traffic volume, and this separation involves complex adaptation of the billing system. This problem will not occur, however, when an independent APN solution is in use. The circuit-switched CS and VoLTE networks will coexist for a long time to come, and coordination between the two is crucial to seamless user experience.

A unified core network can then be built to improve user experience and operational efficiency. E2E QoS deployment involves multiple fields and numerous NEs, posing a great challenge to carrier and vendor integration capabilities.

In terms of service deployment, there are two challenges. This solution is not mature and requires tremendous CS network reconstruction. This process is known as anchoring.

It is easy to deploy but reduces service processing efficiency, so most carriers currently use mobile terminated MT anchoring only. Considering the availability of solutions and time to market, carriers should select solution 2 or 3, based on their network conditions. There are several ways to help carriers migrate IN services. Carriers can choose a suitable solution based on their network conditions and specific services.

Coexistence allows for smooth deployment, but it requires flexible number routing FNRas most users are migrated to LTE without a change to their phone numbers.

volte optimization parameters

HLR replacement does not require FNR deployment, but it is still risky and requires comprehensive verification of every service scenario. Carriers can determine a database deployment solution and process based on their network conditions. DRA deployment helps simplify deployment and maintenance of Diameter signaling networks and accelerates service rollout.

As users migrate to LTE, the required capacity of Diameter signaling networks will increase while the capacity of SS7 signaling networks will decrease. VoLTE's all-IP architecture and complex service processes pose great challenges to network management.

Real-time telecom services, such as voice and video, are sensitive to delay, imposing strict requirements on E2E QoS, including QoS on the wireless side. The configurations must be adjusted correspondingly as the network changes.

volte optimization parameters

Generally, virtual private networks VPNs are used to distinguish signaling, media, and maintenance management data from telco networks to improve service security. QoS improvement is important to the reconstruction of bearer networks, as they must be enabled with DiffServ queue scheduling in order to differentiate QoS.

VoLTE deployment involves many issues related to operation and network optimization; all require persistent effort and rich experience to overcome. We hope that carriers, network equipment vendors, and device and chip manufacturers all cooperate to promote the development of the VoLTE industry.

Corporate United Kingdom [Change]. Back to Main Menu Huawei Websites. Select a Country or Region. CS core network reconstruction The circuit-switched CS and VoLTE networks will coexist for a long time to come, and coordination between the two is crucial to seamless user experience. Service platform and intelligent network reconstruction In terms of service deployment, there are two challenges. There are three ways to resolve the first challenge.

IP bearer network reconstruction Generally, virtual private networks VPNs are used to distinguish signaling, media, and maintenance management data from telco networks to improve service security.Typical LTE networks are designed for downloading, streaming and web browsing - basically handling data traffic.

In such cases, mobile users are deprived of high definition voice and video experience, which can only be delivered through an all-IP network. Works combines the power of closed-loop optimization and its IMS know-how to reduce the "cost per erlang" and shorten the "time to launch VoLTE services". Contact us to learn more about P.

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Works solutions and how we can help you solve your business and technology challenges. Managed Services Accelerating transformation by combining the power of automation with our network experts Professional Services Helping you solve complex problems with our team of experts Training Services Giving you the power to enhance efficiency and effectiveness of your team and network.

News Check out our latest news and stay connected Events Meet P. Works team to discover the value of our solutions and technology White Papers Gain the latest technology insights from our white papers. Life at P. Device manufacturers are investing in VoLTE enabled devices. The motivation for moving to an all-IP network is to deliver a unified mobile voice and data experience over LTE networks. Migrating to an all IP network will certainly offer a number of benefits as it will help mobile operators deliver more diversified services with higher quality.

On the other hand, it will not be a straightforward transition for them as subscribers will expect a similar voice call experience in comparison to what they used to get in 3G and will demand high quality multimedia services which are enabled by the new IMS architecture.

The solution can tackle each class of problems with corresponding troubleshooting and optimization actions. Works ensures premium VoLTE experience by combining the power of automated network optimization products with global subject matter experts with a track record in radio access, core and backhaul technologies. Automated optimization of coverage, capacity, mobility performance of wireless networks do not only allow mobile users to enjoy HD voice and high speed broadband services but also minimizes engineering efforts.

While P. This way, high quality and consistent voice and video experience is ensured across the whole network. Contact Us.

VoLTE Capabilities. RAN Optimization Requirements

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