VoLTE Drive Test KPIs.

1 Call Setup Success Ratio Accessibility IMS Initial Registration Success Ratio TAU/LAU success rate

A. Call Setup Success Ratio ;- In telecommunications, the call setup success rate (CSSR) is the fraction of the attempts to make a call that result in a connection to the dialled number (due to various reasons not all call attempts end with a connection to the dialled number). B. This KPI will tell if the customer is successfully registered to IMS Network. 2. It is calculated on the number of users successfully completed SIP Registration. C1; - What is Lau in networking? Location access unit (LAU) allow Corning® Optical. Network Evolution (ONE™) solutions to support. both Wi-Fi and Bluetooth low energy (BLE) enabled. applications. C2; - What is Tau in 4g? Tracking Area Update. The LTE UE detects a change to a new TA (Tracking Area) by decoding the TAI (Tracking Area Identity) broadcast on the serving cell that it has just selected. This is done by comparing this value with the list of TAI that the UE has registered in the network. Retainability Call Completion Success Ratio 2. What is the call completion ratio? Overview. The Call Completion rate refers to the total number of calls that are initiated and connected successfully, in comparison to the number of calls that fail. A call failure can occur when there is an incorrect phone number, a non-answer, or a customer declines the call. 3 VoLTE Intra-LTE Handover Success Ratio Handover Success rate VoLTE Inter-Frequency Handover Success Ratio VoLTE SRVCC Rate 1. VoLTE Intra-LTE Handover Success Ratio Ideally IRAT Handover OUT SR is >= 95%. IRAT Handover OUT SR report can help the Network Operations team to: Identify eNodeB in network which has low IRAT outgoing success rate. Identify failure reasons in low success rate. 2. - VoLTE Inter-Frequency Handover Success Ratio VoLTE Inter Handover Incoming Success Rate ... It analyses the intra or inter-frequency Handover (HO) IN and includes both inter-eNodeB and intra-eNodeB scenarios.* 3. VoLTE SRVCC Rate. Single Radio Voice Call Continuity (SRVCC) provides an interim solution for handing over VoLTE (Voice over LTE) to 2G/3G networks. The voice calls on LTE network are meant to be packet switched calls which use IMS system to be made. 4 Intra-LTE Handover Media Interruption Time Handover Delays Inter-RAT Handover Media Interruption Time 1.- Intra-LTE Handover Media Interruption Time In a typical 4G LTE cellular deployment scenario, the handover interruption time is between 30 to 60 ms and can possibly attain the upper limit depending on the handover scenario, density of the network, and other radio conditions. 2.- Inter-RAT Handover Media Interruption Time Intra-RAT handover occurs when a user moves from one 3G cell to another. The user, in this case remains in the 3G network. Network designers try to ensure that the network has enough resources to carry out an Intra-RAT handover as Inter-RAT can result in the call being dropped at times. IMS Initial Registration Time Integrity Call Setup Time (VoLTE-VoLTE) Voice Quality (MoS) RTP Packet Loss Rate 1. IMS Initial Registration Time In Full IMS registration, it can be split into three major process as shown below. Unauthenticated IMS Registration Attempt. IPSec Security Association Establishment. Authenticated IMS Registration. What happens if IMS is not registered? IMS STATUS NOT REGISTERED means that your SIM card CAN NOT connect to your carrier's network. You may still be able to send and receive regular messages and have an internet connection (such as I did), or it may be vice-versa with calling, but not receiving any internet. 2. Call Setup Time (VoLTE-VoLTE) Call setup time is the time from the moment VoLTE user initiates the call until the user receives notification about the called party being alerted. This call type termed as VoLTE to VoLTE, and call setup time is measured entirely from the UE, which originates the call. Typical Call Setup Time is 3 to 5 seconds. Voice Quality (MoS) The Mean Opinion Score (MOS) has been a commonly used metric to measure the overall voice call quality for decades. MOS score is a rating from 1 to 5 of the perceived quality of a voice call, 1 being the lowest score and 5 the highest for excellent quality. 4. What is an RTP packet? RTP is a packet-based protocol, which means that it breaks the media stream into packets for transmission over the network. Each packet is given a sequence number, which allows the receiver to reassemble the packets in the correct order. 6 Delays Speech Path Delay <225 ms Inter Arrival Jitter <40 ms 1. What is the delay time for VoLTE call setup? Call Setup delay This call type termed as VoLTE to VoLTE, and call setup time is measured entirely from the UE, which originates the call. Typical Call Setup Time is 3 to 5 seconds. 2. What is the interarrival jitter? The interarrival jitter J is defined to be the mean deviation (smoothed absolute value) of the difference D in packet spacing at the receiver compared to the sender for a pair of packets. 7 Quality Mute/Garbled/Echo calls <=2 % 1. Mute/Garbled/Echo calls 8 RSRP Others SINR BLER DL BLER UL 1. RSRP RSRP – The average power received from a single Reference signal, and Its typical range is around -44dbm (good) to -140dbm(bad). RSRQ – Indicates quality of the received signal, and its range is typically -19.5dB(bad) to -3dB (good). 2. SINR SINR (Signal to Interference plus Noise Ratio) is a metric that measures the ratio of the desired signal power to the sum of the power of all other interfering signals and noise. It provides a measure of the quality of the received signal and the ability of the device to correctly decode the data. 3. BLER DL & BLER UL Block Error Rate (BLER) is used in LTE/4G technology to determine the in-sync or out-of-sync indication during radio link monitoring (RLM). Normal BLER is 2% for an in-sync condition and 10% for an out-of-sync condition.