Kemin Li: The Evolution and Future Development of Coaxial Access Technology

The CCBN International BROADCASTING DEVELOPMENT FORUM (CCBN-BDF) was held in Beijing from March 19, 2012 to March 23, 2012. On March 19th, 2012, a launch ceremony and a series of special meetings were held at the Beijing International Convention Center.

The CCBN-BDF series of thematic forums sponsored by the CCBN Organizing Committee and co-organized by China-Canada will be held on the second floor of the Guozhan Office Building (formerly known as the “Comprehensive Building”) from the 21st to the 23rd.

At the forum on network construction and two-way transformation (1), Mr. Li Kemin, director of research and development at Leiketong Technology (Hangzhou) Co., Ltd., made a report titled "The Evolution and Future Development of Coaxial Access Technologies."

Pictured: Mr. Li Kemin, Director of Research and Development, Retech Technologies (Hangzhou) Co., Ltd.

The following is a speech record:

Li Kemin: Ladies and Gentlemen, Good afternoon, just now Mr. Xu has introduced the technical details of C-DOCSIS in detail, including the status of development. I have also been in the online reform industry for more than 6 years. I may not be able to achieve such a deep technical depth. However, I will look at the technological development and future development of the two-way network reform from the perspective of equipment vendors. Today is mainly divided into several topics, the first from the perspective of demand; Second, the development of two-way network development and Eoc technology analysis and evolution, and then introduces the next generation of coaxial access technology, including C-DOCSIS- EOC. The two-way network reform will ultimately serve the broadcasting and TV business. We will analyze it briefly and roughly divide it into three major categories. The first is the basic two-way business of the broadcasting and TV operation layer, which is regarded as interactive television. This is mainly a few pieces. The first is the video. On demand and management channels, this management channel needs to be broadcast on the on-demand interface and requires 1-2 megabytes of bandwidth. This is a short-term video that travels from other places. The interactive TV has a browser page. Relative to the browser application, the operator may also provide a 1-2 MB broadband internet service, and then a value-added service. In this case, I divide it into two parts. The first is a high-bandwidth service. You can take video channels from two directions, including HD and SD. Second, I can compete with the telecommunications broadband Internet access, 8-10 trillion points. The third definition of high-speed download, because broadcasting has a lot of video services, relying on business to achieve some, say I have high-definition video, may be a TV may be a movie, may be more programs, I can give it in my network dozens of megabytes The channel allows it to quickly download it to its local forum or device for playback. There is also video communication, which is a symmetrical two-way service. There is also a value-added service that is a real-time business, such as Voip, VOIP like telecommunications, and interactive games. The response time is very high. Generally, ordinary networks will find some cards.

We further analyze it a little bit. If we look at the basic direction of interactive TV, our understanding is that operators want an overall rectification method. Each set-top box is HD interactive and needs to have Such an interactive business, so that we break it down, in general we hope to support 50-100 fully opened. Each household has a 1-2 MB downlink bandwidth, 256-512KBPS Shanghang, delay is not sensitive, Qos is not sensitive, and medium-long packets are dominant. I did not specifically distinguish between high-bandwidth services and real-time services, and defined them as triple-play services. This is more feasible for broadcasters to open on demand. This would require each user to provide 20 megabytes of MBPS broadband and guarantee DBA control. It also requires less delay and jitter to ensure that the performance is not very sensitive to small packets. Again, this is a requirement of technology, and radio and television should be better adapted to the requirements of the network. It is hoped that the physical layer supports adaptive modulation to adapt to various attenuation, reflective environments, and interference environments. There is no way in the countryside, and the city’s light will go back to N+0. Satisfy the basic business is to access 50-100 households at the same time, bandwidth 100MBPS is not sensitive to packet delay and QoS. The cost of network transformation is low, and the cost of service opening is low. Satisfy value-added services, broadband is fully opened 500M-1GBPS, 30% opened, 200-300Mbps, smaller concurrent delay and jitter indicators, packet performance is good.

Let us look at the development stage of two-way network reform. It is simply divided into three phases. The first is the C-DOCSIS application, and the second is the North American model and then the EOC development. Slightly brief introduction of C-DOCSIS is mainly based on large coverage, downlink broadcast transmission, uplink TDMA or S-CDMA technology, the difficulty is convergence noise, high network requirements, and high cost per unit bandwidth. Baseband EOC, mainly small coverage, centralized distribution network transformation, Ethernet signal matching conversion, transmission directly on the coaxial cable, switch distribution centralized distribution network, 10 MB bandwidth access, both of the above can be applied, EOC is China The national conditions technology mainly applies a high-speed home networking technology to coaxial networks, low-frequency bands, Homeplug AV, power lines, and HPNA phone lines. High band, Wi-Fi down, wireless. MOCA coaxial. Features, in line with national conditions.

The EOC technology model headend + coaxial network + terminal is equivalent to a virtual Layer 2 switch that extends over a coaxial cable network. The above is a spectrum diagram with AV and C-DOCSIS uplinks. From the perspective of industrialization, the high-frequency and low-frequency spectrums do not overlap, and the industry chain is subject to passive acceptance by chip vendors, equipment vendors, and operators. Without too much dominance, the threshold is not high and there will be more price competition. This is the data collected by our company. It is not necessarily accurate. It is the market share of EOC in 2011. Basically, low frequency accounts for almost 60%, high frequency is about 40%, and Wi-Fi accounts for about 1/4. Now that EOC technology is further evolving, we simply list a table. Essentially, everyone will expand the bandwidth. The physical layer will feature a bit, and the speed of MOCAMAC layer will reach about 400MBPS. We further analyze the EOC and we also see ourselves. What to do, it will have a small defect in the heavens. The rate of evolution is roughly 250-400 trillion. If it can be bundled, it will be higher. Packets have low performance, concurrent delay is too large, and the QOS mechanism is not perfect. From the basic radio and television services of radio and television, as well as the requirement of lower opening rate and high bandwidth value-added services, it can meet the basic business needs of radio and television, but it will restrict the full-scale development of value-added services. Here we see that this generation is a commercial product that has achieved relatively good results. Broadcasting and television have carried out basic businesses and high-bandwidth services. We see what the next generation is like.

Just now Xu has talked about more. I have a total of 2 pages of PPT, which is basically based on DOCSIS. The uplink is a maximum of 40 megabits per channel of bandwidth, supports 4-channel bonding, and a maximum of 50 megabits per channel of downlink, supporting 16-channel binding. . Based on C-DOCSIS 2.0 and 3.0. DOCSIS-EOC is characterized by an increase in speed, a maximum of 800 megabits (1024QAM) in the downlink, and a maximum of 160 megabytes (256 QAM) in the uplink. The head-end push-down covers 200 users, reducing the impact of convergence noise. Simplify and reduce costs. It retains the advantages of CMTS management and QOS and is compatible with existing CMs. My 200 households have an average of about $1,000 per household. This is a problem for me. There is also a PHY based on EPONMAC that is suitable for coaxial. ECAN: Low Band, TDD, 130 Megabits, VSBPHY. In the development of the IEEEEPOC standard, it is mainly required to support Node+n amplifiers. In terms of speed, uplink 1GBPS, downlink nGbps, 1G above will get higher uplink bandwidth. In the lending proposal, Broadcom put forward a concept. Above mentioned fiber to coaxial, I hope to be the physical layer, directly a data, you can call data conversion, so that you can do EPONOVER expansion, this is still controversial, is not seamless It is still controversial to do this. One of the two main companies involved is Broadcom. He talked about SDMPHY. He has the biggest advantage. The requirements are relatively high. I can adapt to various frequency allocation situations. I can plug in anywhere to send this data. It has it. The advantages. Qualcomm understands this better.

I will talk about DECO again. It will be a bit like EOC. It has a frequency band of 5-80MHz, a bandwidth of 20-60MHz, a MAC speed of about 300Mbps, and a good QoS and DBA mechanism. The standards of home networks include television lines, telephone lines and coaxial cables. This physical layer will have a relatively high level of contact. I personally think that we can explore the direction. There is hinoc, everyone may think that the bandwidth is a little lower, and now 2.0 is also doing the standardization process. This framework is like this, the frequency band is 750HMz to 1006MHz, the channel bandwidth is 16MHz, and the speed is about 60Mbps. 2.0 is still in the process of development. The first result will be biased. How to seek common ground with the EPOC, we did not achieve one point in the standardization. For the standards driven by the demand of equipment operators, we started to propose solutions. I think we must learn from international standards. We must first meet the requirements to what extent. It's better to give it and then everyone else mentions the plan.

Can you form a good industrial ecosystem, do you have any operator participation, do you have strong chip companies and equipment vendors, Beida, Guangzhou Academy of Sciences, Planning Institute, Huawei, and semiconductors? Industrial ecosystem. Finally, I summarize with a few articles. At present, we analyze the development of EOC to meet the purpose of basic radio and television services, and 20% to 30% of high-bandwidth services. My analysis is that I feel that the difference from DOCSIS 3.0 is not particularly noticeable. Eventually, EPOC will be adopted. Industrial chain, because HINOC2.0 has yet to be perfected. My suggestion is that HINOC 2.0 should take its own path. It does not mean that in order to force Chinese characteristics and independent intellectual property rights, the main reason is that it can give the industry one more choice, so even if there is one more choice, it can be said that the industry or Equipment operators have a premium capability. I personally feel that EPOC will become the next generation of DOCSIS. HINOC 2.0 will be the next generation of EPOC. thank you all!