Although LTE test technology is progressing significantly, it still faces triple-cut in the future.
LTE networks, 2G and 3G networks will coexist for a long time and develop together. Multi-mode, multi-standard and multi-frequency convergence is also one of the basic strategies for operators to build LTE networks. Through the continuous efforts of the industry and the verification of the experimental network, the field of LTE network testing has made great progress. However, in the development direction of multi-network collaboration, there are still many challenges and need to be further actively addressed.
First, from the business perspective, the mobile Internet service application that is booming in the 3G era will definitely further enhance its application in the LTE era. From a network perspective, mobile Internet services consume a large amount of network resources (for example, regular update packets of P2P services consume a lot of air interface resources), but from another perspective, new generations of mobile communication networks also need these new services. Continued demand to drive its development. Therefore, the resource consumption demand for the mobile Internet is “sparse†rather than “blockingâ€. One of the solutions is to identify and support the business in the air interface. Such requirements put forward new requirements for the development of monitoring instruments, requiring air interface test instruments to identify and analyze services, and correlate with the underlying signaling and physical layer processes to jointly address the challenges of the mobile Internet.
Secondly, from the perspective of test methods, the degree of automation of test data acquisition technology is not high enough. There is still a large amount of data collection completed by manpower, and there is room for improvement in work efficiency. The level of data automation analysis, intelligent analysis and management capabilities vary from region to region, with higher levels in developed coastal provinces in the east and areas in the central and western regions. Big data analysis, mining and application still need further research and utilization.
Third, the interoperability technology solution is complex. After the network deployment is completed, 2G, 3G, and 4G networks will coexist for a long time. Considering that the coverage of 4G networks is gradually improved, network deployment must consider interoperability between networks. The cellular system needs to support interoperability in 4G systems (LTE FDD and TD-LTE hybrid networking), and also support interoperability between 4G and 2G/3G. Due to the particularity of 3G and 2G systems, 4G and 2G/3G system interoperability faces many technical problems. For example, China Mobile's voice solution CSFB to GSM is quite different from foreign mainstream carrier voice solutions. The interoperability between TD-LTE and CDMA systems is unprecedented in the world. The handover process between VoLTE and 2G/3G is more complicated, and the hybrid networking technologies of FDD and TD-LTE also need to be further improved.
Interoperability testing tasks are still arduous
The 3G networks of the three major operators have completed large-scale construction. The newly deployed LTE network is difficult to reach the coverage and depth of 2G/3G networks in a long period of time, and the VoLTE technology is not mature enough at present. Therefore, LTE and 2G/3G networks cannot In isolated operation, interoperability must be used to ensure continuity of services between networks. Interoperability between LTE and 2G/3G includes voice interoperability and data interoperation.
Taking China Mobile as an example, for data interoperation, not only does TD-LTE and TD-SCDMA require two-way reselection of idle state and two-way redirection of connection state, but also requires interoperability between TD-LTE and GSM networks. To ensure business continuity, complex switching scenarios are a daunting challenge for testing.
For China Telecom, for voice interoperability, since there is no interoperability between LTE and CDMA circuit domains, SVLTE (single card dual standby) mode can be considered in the initial voice solution. The terminal supports voice and data concurrency. In the future, it is considered to introduce VoLTE in a timely manner. Voice business. For data services, the HRPD network can be upgraded to eHRPD, and the non-optimized handover mode ensures that LTE and eHRPD data services are continuous.
In the face of the upcoming LTE commercialization, in order to ensure a high-quality user experience, the LTE test of the operator needs to strengthen the simulation of the edge switching of various terminal services in different scenarios, so that the multimode terminal in the actual network is as far as possible. Stay on the LTE network. When the network load is too high, according to the QoS mechanism, the user perception of the VIP client is guaranteed as much as possible; when switching between LTE and 2G/3G, the handover threshold is controlled. On the other hand, it is necessary to carry out interoperability switching test verification between LTE two major systems and 2G/3G for different existing terminals, different version types, different instant messaging services, and different software application versions. By imitating the user experience, we can find out the length of time to enter the dormant state, login behavior, heartbeat cycle, and send and receive message behaviors, etc., strengthen test support, and guide troubleshooting and optimization. In addition, it is necessary to carry out parameter configuration optimization experiments for sub-scenarios (indoor, outdoor, elevator, etc.) for 3G/4G interoperability strategies, and conduct test comparison analysis to output network parameter configuration suggestions that are more in line with the existing network and close to the user experience.
For VoLTE, due to the immature status, operators can test the support level of VoLTE and eSRVCC through the laboratory test, and verify the VoLTE voice quality under real network and the impact on existing plans. In the VoLTE test, operators can establish or further improve the automatic drive test system, use the remote control device to automatically obtain test control information and automatically execute tests, transfer data to the central server, and automatically output reports.
Intelligent pipelines should have three capabilities
Operators should fully exploit the value of massive data in the LTE era, analyze and identify the user's terminal service behavior through the analysis of the network signaling layer; use the KQI indicator quantization system to grasp the actual call experience and data service of the user or the specified user group. Use the experience (including the quality of the call and the behavior of the call caused by network/non-network reasons) to help the operator to objectively understand the user's feeling of using the service. To build a smart pipeline, operators should have three capabilities: the ability to identify individual requirements, the ability to personalize matching/distributing, and the ability to support aggregation models.
In order to achieve the above objectives, a big data mining and analysis platform must be built. The big data analysis platform should have the following capabilities:
1) Improve the quality of customer service and achieve accurate marketing in the market;
2) Optimize and configure network resources according to the network association model;
3) Better implementation of traffic management through differentiated services.
In this regard, bandwidth management technology (DPI and DFI), P2P traffic identification technology and flow control technology, Hadoop-based data analysis and processing system help operators to build a big data mining test platform.
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