Future professional wireless communication industry development direction
Foreword: In today's professional wireless communication technology booming, technology application is more in-depth today, the traditional narrow "special network" understanding has become a thing of the past; digital walkie-talkie, PDT, LTE, McWiLL, MiWAVE, PTT and other technologies, ushered in a professional The spring of communication industry development; the diversified technology applications such as voice, data, image and video highlight the colorful and new features of the private network market; facing new environments, new technologies, new applications, new markets The new pattern, how should companies in the industrial chain adjust their own development structure, how to face market competition in the new environment, how to carry out effective technology integration, and how users choose solutions that suit their needs are the current industry facing Big problem.
In order to promote the rapid development of professional communication and accelerate the formation of the professional communication industry chain, with the strong support of the Ministry of Industry and Information Technology and the Ministry of Public Security Science and Technology Information Bureau, in the "enhance the exchange atmosphere, experience the digital China, promote technology integration, create a common application. Under the tenet of “Pattern”, in order to cater to and meet the communication and application needs of diversified technologies in the industry, “2013 Shenzhen International Professional Digital Communication Technology and Information Expo” will be held in Shenzhen Convention and Exhibition Center; this exhibition mainly includes digital walkie-talkies. , digital trunking system, wireless broadband communication access, intelligent security, data transmission and related command and dispatch, emergency support, solutions and other high-end technology applications and displays, involving public security, energy, transportation, urban communities, business and other dozens of different The specific field reflects the development trend of professional wireless communication technology and will create positive conditions for building a smart city and a harmonious society.
This expo, the professional wireless digital communication technology and application development forum is a highlight. The digital walkie-talkie and the PDT digital trunking system of the public security department will focus on the professional users, and the outstanding enterprises and professional users from home and abroad will A gathering of high-level, high-level industry exchange conferences will be performed.
Through the exchanges with a large number of enterprises, this article carefully analyzes the industrial characteristics of the new technology period, and expresses some rough views on industrial development and enterprise adjustment. Welcome to correct me.
1. Technological evolution of the professional wireless communication industry
In the information age, wireless communication technology has been fully applied in various fields, carrying and promoting the progress of the times and the stability of society. Professional wireless communication refers to the communication network built in some industries, departments or units to meet the needs of organization management, safety production, dispatching and commanding. With the advancement of technology, the status and role of the private network is more prominent and timely. Effective voice communication, data collection and image and video transmission play a key role in the harmony and stability of society, cities and families, and complement the public network communication.
In the past, the technical standards for private network communication in China were mainly based on the introduction of foreign standards. Most domestic private network manufacturers did not master the core technology and were located at the low end of the industrial chain. Most professional communications only stayed on walkie-talkies, single-sidebands, and VHF radio stations. And the analog cluster stage; a small part of the private network uses TETRA, IDEN and other narrow-band digital cluster technology, but the market is basically monopolized by international giants such as Motorola, EADS, Nokia, and Siemens.
Since 2007, China's private network construction has received strong support from the government, and the development of private networks has entered a rapid stage. Strong sectors such as public security and military, as well as key industries such as oilfields, electric power, rail transit, inland shipping, airports, and ports, fully recognize the transformation of private network informationization to promote the transformation of traditional industrial production methods, industrial structure optimization, production efficiency and economy. The importance of improving the efficiency, etc., has produced a number of special network construction programs, thus forming a situation in which flowers bloom and colorful.
The national major special project of “New Generation Broadband Wireless Mobile Communication Network” has formed a clear strategic idea for the development of China's private network communication industry. The target market of China's independent broadband wireless access industry is the industry information network. Broadband multimedia clustering system is the main direction of broadband wireless access technology.
On January 7, 2013, under the joint supervision of the Radio Management Bureau of the Ministry of Industry and the Ministry of Public Security and the Ministry of Public Security Science and Technology Bureau, the “Public Protection and Disaster Relief Broadband Wireless Communication (PPDR) Technology Forum Inaugural Meeting was held in Beijing”, Academician of the Chinese Academy of Engineering, He Hezhen, Ministry of Industry and Information Technology Radio Director of Management Xie Feibo and Deputy Director of the Ministry of Public Security Science and Technology Information Bureau Ma Xiaodong and other leaders attended the meeting and congratulated and delivered a speech. This conference is of great significance to promoting China's broadband PPDR process and accelerating the construction of the private network industry chain.
2. Broadband multimedia cluster system is a fusion application of multiple communication technologies.
With strong fixed network, broadband, 3G and other network resources as the communication basis, fully utilize high-speed network bandwidth and powerful multimedia service support capabilities to realize communication systems for mobile office, Internet of things, e-commerce, etc., is a broadband multimedia cluster system. . This kind of system can provide various information solutions, provide tailor-made and efficient information services for customers in the industry, and enjoy information applications at any time, anywhere.
Specifically, it integrates multiple media such as text, sound (including music), images, animation, video, etc., through a private network transmission method, and then processes various media, which is characterized by diversification and integration of information media. Interactivity and real-time. The development of multimedia requires the following key technologies: (1) data compression and coding technology. (2) Media synchronization technology. (3) Multimedia network technology. It can be seen that the broadband multimedia cluster system is a fairly comprehensive communication technology application, which often needs high-tech technologies such as computer, network, signal transmission, software radio, statistical theory, chip technology, and structural technology.
Key industries such as public safety, energy, transportation, and modern agriculture are in urgent need of broadband multimedia cluster systems, and the market share is large enough, but the innovation chain and industrial chain of broadband multimedia cluster systems are urgently needed. The major special group called for the close cooperation of the various units related to the “production, study and research” of the broadband multimedia cluster to form an industrial alliance and become a large industry. The major special broadband wireless access group proposed a “two-step” promotion strategy for broadband multimedia cluster systems:
The first step: McWiLL broadband multimedia cluster system is consistent with the needs of the current industry. The industrialization conditions are met, the standards are relatively mature, and it can be industrialized in a shorter time. McWiLL is equivalent to 3G in the cluster system, and the initiative is based on McWiLL. In the middle of the “Twelfth Five-Year Plan”, a complete industrial chain of broadband multimedia cluster systems will be established to achieve large-scale commercial use.
Step 2: The cluster system based on TD-LTE technology will provide a transmission rate greater than 100 Mbps for the future, which is equivalent to 4G in the cluster system. The TD-LTE cluster system is proposed to be applied at a large scale at the end of the “Twelfth Five-Year Plan”.
3. New technologies for private network communication are changing with each passing day. New technologies in professional communication are emerging. The following are new communication standards, technologies and methods.
◆ LTE: As we all know, 2G and 3G have provided a good voice network. The task of LTE is to superimpose a broadband data access network on a 2G/3G network. This is quite meaningful in reality, it can increase the transmission rate, and effectively reduce the communication cost. Adopting OFDM and MIMO as the only standard for its wireless network evolution can provide a peak rate of 100 Mbit/s downlink and 50 Mbit/s uplink in a 20 MHz spectrum bandwidth.
In 2007, under the leadership of the Chinese government, China Mobile launched the TD-LTE international standard in the International Organization for Standardization, becoming the only TDD standard in 3GPP. The TDD technology of China's independent intellectual property rights really began to go international. In January 2012, China's TD-LTE-Advanced standard has become one of the ITU 4G communication standards.
The advantages of TD-LTE are that the spectrum efficiency of TD-LTE is relatively high, and it can reach 5-10bps/Hz at present. The second is to do cluster application in the private network, and the call delay is relatively short, which is conducive to the formation of TD-LTE technology. Cluster private network. TD-LTE has been applied in some private networks, such as Beijing, Tianjin Government Affairs Network, and Zhejiang Haiyan's National Grid Test Network. In the energy industry, such as oil and coal mines, there is also a strong demand for TD-LTE.
◆ McWiLL: Multi-carrier wireless information local loop technology is a mobile broadband wireless access system independently developed by Beijing Xinwei Communication. It is a leading international broadband wireless access technology standard. The system rate of single carrier/segment can be Up to 15Mbps. In December 2008, the National Radio Administration of the Ministry of Industry and Information Technology issued No  No. 332 document, and McWiLL complies with the requirements for the use of the 1800MHz wireless access frequency band.
In 2009, China Communications Standards Association (CCSA) completed the development of a series of industry standards such as "Air Interface Technical Requirements for 1800MHz SCDMA Broadband Wireless Access System", laying the foundation for McWiLL to become an international standard. The McWiLL system was recognized by the ITU as an international standard for mobile broadband wireless access technology in 2010. It is another international telecommunication standard with complete independent intellectual property rights after TD-SCDMA. It is also the only authorized frequency in China and has established a complete industrial chain. Broadband wireless access system.
◆MiWAVE: This is the broadband wireless access series launched by Shanghai Haoxun Wireless Technology Co., Ltd., based on the Broadband Wireless Multimedia (BWM) national standard, compatible with the TD-LTE standard framework, and adopts the independent DFT- S-GMC multiple access technology improves the efficiency and coverage of power amplifiers, enhances the ability to resist Doppler shift, and reduces the construction cost of broadband wireless networks.
MiWAVE can work in UHF (470MHz ~ 806MHz), 2.3G, 2.5G, 3.5G, 5.8G and other frequency bands, and can be extended to other frequency bands according to actual needs, flexible deployment. MiWAVE brings the following benefits to end users, including fixed/nomadic/portable/mobile access, more business enjoyment, Internet surfing, email and wireless interactive digital TV.
This system is one of the important technical directions of the national 11th Five-Year Major Project "New Generation Broadband Wireless Mobile Communication Network" and is a supplementary solution for China's 4G proposal. Its advantages in disaster relief are mainly manifested in the ready-to-use and high-speed transmission, and its system peak data transmission rate can reach hundreds of megabytes. The MiWAVE system played an important role in the disposal of the barrier lake in the 2008 Wenchuan earthquake.
◆ PDT: In 2008, the police digital cluster system PDT, which was led by the Chinese Ministry of Public Security, is a digital communication standard that combines China's current situation and reality, looks internationally and has Chinese characteristics. Once launched, it has attracted the attention of all parties. After more than four years of hard work, the standard is expected to be released in the near future. The following characteristics of the PDT standard determine its good application prospects in China:
◇ Large-area system, low cost; few base stations, low network construction investment and post-operation and maintenance costs, in line with the actual situation of China's large land area and low capital;
◇ Simulate smooth transition of MPT1327 cluster system to protect existing investments, users do not need to re-plan network, frequency and change usage habits;
完善 Perfect inter-system interconnection and unified network management protocol to meet the national network. Referring to the 3GPP IMS design, the application of SIP reflects better interoperability and meets the requirements of multi-vendors to jointly build a national PDT network;
◇ Secure voice encryption To ensure the security of the call, the PDT standard specifically designed a hardware-based optional voice encryption scheme. The available security solutions include authentication, air interface encryption, end-to-end encryption, key management mechanism and link. Encryption, to achieve some or all of the functions according to the need to achieve a certain level of security;
自主 Independent intellectual property rights Designed from the police demand of Chinese public security, the functional design is closer to the actual needs of the Chinese police;
◆ GSM-R: The system is a comprehensive dedicated digital mobile communication system designed for railway communications. It has advanced voice calling functions, such as group call, broadcast call, multi-priority preemption and forced demolition. It adds functions such as location-based addressing and functional addressing, and is suitable for railway communications, especially for railway-specific dispatching communications. . It mainly provides wireless communication, group shunting communication, section maintenance and repair operation communication, emergency communication, tunnel communication and other voice communication functions. It can provide data transmission channels for train automatic control and detection information, and can provide automatic train addressing and passengers. service. This system uses the ubiquitous GSM network. At the end of 2000, the Ministry of Railways officially determined GSM-R as the development direction of China's railway special communication. On July 1, 2006, the entire line of the Qinghai-Tibet Railway was opened, marking the official entry of the GSM-R communication system into the railway operation of China.
◆ PTT: PTT cluster system (Push To Talk) is a voice communication service based on mobile public network (GSM and CDMA). Users can use one-to-one and one-to-many calls like a walkie-talkie. This technology was proposed by US mobile operator Nextel in 1993. In 2010, China Telecom launched the “Tianyi Intercom”, which is the kind of communication. In 2012, this service was gradually accepted by customers.
◆ PPDR: Public protection and Disaster relief, public protection and disaster relief communications. It is an important topic for the International Telecommunications Union Radiocommunication Sector (ITU-R) to coordinate the needs and technologies of radiocommunication administrations in countries and regions around the world to study radiocommunications for public protection and disaster relief. PPDR is the most important part of emergency communication, and it is an important guarantee for realizing government emergency plans, mainly relying on radio broadband communication.
4. The characteristics of professional communication in the new era are the organic integration of various technologies and applications.
1) Multi-technology integration Modern communication is often a comprehensive application of multiple technologies, achieving complementary advantages and complementing each other. A communication standard may use TDMA and FDMA access, and the channel may be encoded with multiple channels when transmitting. Multimode multi-frequency terminals are popular for compatibility. In the digital walkie-talkie machine, in order to combine digital and analog, the digital-analog automatic recognition technology allows users to experience the convenience brought by high-tech. A digital walkie-talkie single chip that is compatible with a variety of standards and a variety of vocoders has been available.
2) Integration of public network and private network The division of labor between public network and private network has changed in the new technology period. The private network has a cluster scheduling function, and the public network can also have a scheduling function. The PTT push-to-talk function introduced earlier. It is to use the cluster scheduling system of the public network. People hope that the intercom can communicate with the mobile phone, and also hope that the mobile phone can be used for intercom.
3) Narrowband and broadband convergence Separate narrowband communication applications have limited limitations, broadband access
Digital walkie-talkie advantage