With the repeated epidemics, how can Shengwang help Qingdao Education Bureau to ensure online teaching experience?

The second time of the epidemic has repeatedly pressed the accelerator key for the early arrival of winter vacation in many elementary and middle schools. Since December 2020, affected by the epidemic, many regions in cities such as Dalian, Beijing, Heilongjiang, Shenyang, Shijiazhuang, and other cities have successively announced the suspension of primary and secondary schools and kindergartens. The suspension of offline education and teaching activities has once again sounded the alarm for the entire education industry to prevent epidemics and risks. Some schools and educational institutions in non-stressed areas have also begun to do online filing early, and the demand for online classrooms has once again been highlighted.

Second War Epidemic, online classrooms fight for speed and quality

At the beginning of 2020, the sudden epidemic forced schools and teaching and training institutions to switch from offline to online in a short period of time. In order to ensure "no suspension of classes", many schools and institutions had to temporarily choose some online teaching platforms to rush online, crowded The traffic also caused frequent online classroom crashes, making it difficult to guarantee the teaching experience and quality.

After nearly a year, teachers, students, and parents have accepted online teaching methods and developed the habit of using them. At the same time, the teaching platform also pays more attention to the quality and stability of online interactive classroom audio and video in a large-scale system concurrency and a weak network environment. Many schools and institutions are ready for both online and offline, early selection of quality-guaranteed online education platforms and real-time audio and video technology service providers to cooperate, even in the face of the second repetition of the epidemic, they can still quickly and steadily expand the line Teaching and counseling.

On January 6, the Qingdao Education Bureau announced the first online public welfare tutoring for famous teachers (hereinafter referred to as "Benefit Tutoring") for primary and middle school students in the city. The Municipal Education Bureau announces the tutoring class scheduling plan in advance, and students who participate in live tutoring can also choose courses in advance. After the course selection is successful, participate in the "Benefit Guidance" live learning. Students who have not grabbed the live tutoring class or those who are inconvenient to take the live tutoring class can also watch and learn through the on-demand tutoring class.

The rapid launch of the Qingdao Education Bureau’s "Yi Tutoring" project benefited from the strong technical and platform support from real-time interactive cloud service providers Agora and Ciyun Education. Based on the learning platform of Ciyun Education, students use the Qingdao Education e-platform. , TV platform to participate in tutoring, complete student account registration, live interactive learning, teaching resources on-demand, highlighting the planned, systematic and convenient teaching. At the same time, the underlying real-time audio and video technical services provided by the sound network ensure the stability, fluency and interactivity of live interactive learning.

For teachers and students in Qingdao primary and secondary schools, online public welfare live tutoring not only makes good use of high-quality teacher resources such as Qilu famous teachers, Qingdao famous teachers, famous teacher studios, etc., to meet the needs of some primary and secondary school extracurricular school guidance, but also flexible and convenient. The efficiency of tutoring during the winter vacation for students solves the problem that teachers and students cannot face-to-face teaching and tutoring during the epidemic prevention period.

hardware cost is high and the interaction is poor. How to solve the pain points of online classrooms in public schools?

In the past, K12 public schools usually wanted to achieve online teaching in two modes, namely, delivery classroom and aerial classroom.

Special delivery classrooms emphasize specialization, mainly for the problems of weak schools and teaching sites in rural areas that lack teachers and cannot open enough to open the nationally prescribed courses. Special online courses or synchronized courses are used, and the Internet is used to push appropriate and high-quality education according to the teaching progress. Resources and other forms.

Aerial classroom refers to the use of network information and modern communication technology to record and broadcast the teacher's lecture content or live broadcast the teacher's video, voice, courseware, blackboard, etc., to realistically move the lecture process to the Internet, without special requirements for the students, as long as the Internet can be accessed , You can join the classroom to listen to lessons and participate in Q&A.

However, although traditional delivery classrooms and aerial classrooms can solve some of the problems of education fairness and teacher sharing, there are still many experience pain points in actual operations.

Traditional delivery classrooms are usually highly dependent on hardware conditions and require a variety of terminal equipment support, such as large-screen display equipment, learning terminal interactive equipment, teaching process recording equipment, network connection and transmission equipment, and so on. A wide variety of hardware equipment often means high deployment costs and complex equipment operations, which also bring difficulties to later maintenance; the other traditional delivery classrooms face demanding network requirements and require dedicated line support, but the dedicated line is expensive and stable And the ability to resist weak network is not satisfactory, and the lag and disconnection also occur frequently, which greatly affects the teaching effect and quality.

The pain points of traditional aerial classrooms are also obvious. Whether it is recording or one-to-many live broadcast, the interaction between teachers and students is relatively lacking. With the development of online education in recent years, students’ demand for online classroom interactive experience has become higher and higher, and the traditional form of air classroom has long been unable to meet; on the other hand, the audio and video quality is unstable, high concurrency and stability are poor, and the hardware Poor platform adaptability is also a problem faced by traditional aerial classrooms.

In response to the above pain points, based on the self-built software-defined real-time network SD-RTN™, Shengwang has launched a solution specifically for teaching informatization in public schools, upgrading the teaching scenes of traditional delivery classrooms and aerial classrooms, from cost and convenience Optimized in many aspects, such as interactive experience, stability, etc., to better solve the problems of public school education fairness and imbalanced teacher resources. In the special period of epidemic prevention and control, the online teaching platform empowered by the voice network is built as a guarantee school. And the institution's normalization tool of "suspending classes and not stopping school".

Voice Network

• Reduce hardware pressure and lower the threshold of operation and maintenance

Through software deployment, the sound network reduces the dependence on hardware of the delivery classroom and reduces the pressure of daily maintenance. The entry barrier for schools is very low. At the same time, relying on the Internet, it can also adapt to any school-to-school communication program, avoiding the problem of information islands caused by the non-interoperability of equipment from multiple manufacturers.

• Strong anti-weak network ability, with multiple weak network repair mechanisms

Students in rural areas or remote areas of the third and fourth lines usually face a complex network environment. For audio and video calls under weak network conditions, the sound network has a set of anti-weak network transmission and anti-packet loss algorithms, combined with network detection (such as delay estimation) , Bandwidth estimation, packet loss estimation, etc.), anti-packet technology (such as ARQ, FEC, etc.), adaptive jitter buffer, network congestion control strategy, etc., achieve smooth video calls under 70% packet loss, and voice calls under 80% packet loss Smooth.

Sound Net Air Classroom Advantage

• Improve the real-time interaction between teachers and students

Soundnet's self-built software-defined real-time network SD-RTN™ UDP-based self-developed AUT protocol is further optimized on the global network, avoiding the uncontrollable delay of TCP protocol, and can achieve global end-to-end network delay Less than 400ms, with a median delay of 76ms, ensuring real-time interaction.

• Stable HD video quality under weak network

In the video processing, the sound network no longer regards acquisition, pre-processing, encoding, transmission, anti-weak network, and rendering as an independent link, but forms a loop that closely cooperates with each other to make the video end-to-end The processing reaches the global optimum. It also integrates a variety of self-developed codec algorithms and anti-weak network strategies to provide a 1080P 60-frame high-definition video experience in a weak network environment.

• Meet the tens of millions of platform concurrent singles, classrooms of millions of concurrent

Online classroom hours will encounter high-concurrency scenarios of millions or even tens of millions, and the stuttering of some online platforms during the epidemic is mostly caused by this. Soundnet's SD-RTN™ has made flexible expansion in the network architecture design, and can be adjusted in real time when the traffic surges, so that end users are not aware of it, and it can meet the situation of tens of millions of platform concurrency and single classroom.

• Seamless integration of mobile phone, Pad, computer and TV box

In terms of terminal performance and adaptation, Shengwang has now adapted more than 6000 terminal devices, covering 20 platforms including iOS, Android, Web, Windows, macOS, applets, etc., which can fully guarantee real-time audio and video on mobile phones, pads, and computers. Good applications and seamless integration on various terminals such as, TV boxes.

Acoustic Network provides stable and reliable online classrooms for multiple platforms such as Xiao Blackboard and Wisdom Tree

During the epidemic at the beginning of 2020, in the case of crashes on many platforms, Shengwang provided stable and high-quality real-time audio and video technical services for teaching platforms including Xiao Chalkboard, Wisdom Tree, Open Education, and Honghe Technology. Up to now, Achieve no network-wide accidents for 7 consecutive years.

During the epidemic, Shengwang helped Xiaochai launch an “on-the-air classroom” based on the Education Demo integration. It is understood that there were 500 schools, 5,000 teachers, and 200,000 students learning and interacting in Xiaochai’s live classroom every day, with an average of 10,000 sessions per day. Live lessons. At the highest peak, 120,000 people participated in the class at the same time.

Similarly, during the epidemic, Wisdom Tree used the real-time audio and video technology provided by Shengwang to launch the live classroom function of online voice + courseware sharing, which was provided to teachers and students in colleges and universities for free, helping teachers and students to have a smooth and efficient online teaching interaction. , To ensure that teachers and students in colleges and universities "suspend classes without stopping school."

In addition, Shengwang also provides the underlying technical support for the stable operation of the online teaching cloud platform of OPEN Education's teacher training treasure, and continues to ensure that teachers and students of primary and secondary schools across the country carry out online teaching on the cloud platform. It provides 7*24 hours of technical services and support, and also guarantees real-time online teaching and interaction between teachers and students in primary and secondary schools, so that students can enjoy high-quality teaching courses without leaving home.

Honghe Technology, another educational informatization company, also launched live interactive classrooms during the epidemic, providing primary and secondary schools with the highest quality audio and video interactive live broadcast services. Shengwang uses professional technical means to ensure the system stability of Honghe live interactive classrooms. To ensure the smooth development of online classes for students, once online, it has been highly recognized by the school, teachers and students.