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On the development of new broadband wireless access system status and progress - wireless access, t by big tree
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On the development of new broadband wireless access system status and progress - wireless access, t by BIG TREE
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| Article Posted: 06/14/2010 |
| Article Views: 125 |
| Articles Written: 1033 - MORE ARTICLES FROM THIS AUTHOR |
| Word Count: 752 |
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On the development of new broadband wireless access system status and progress - wireless access, t |
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Business,Business News,Business Opportunities
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Broadband wireless access networks with broadband access to all the wireless networks collectively, compared with conventional wireless communications, broadband wireless access system is mainly for the broadband access network transmission and radio resource management, optimized to support high-speed data, broadband services such as real-time video transmission. Since 1999, IEEE 802.16 Working Group has been established, for the metro system covering the broadband wireless access has rapidly become the information technology (IT) and telecommunications focus of research in the field. After years of efforts, IEEE802.16 standard working group has introduced a model for fixed access and mobile access modes of IEEE802.16 and IEEE802.16e standards, and in early 2006 launched a new topology for the broadband relay wireless access standard IEEE802.16j formulation [1-3].
From a technical point of view, IEEE802.16 series of standards for broadband wireless access system in the access network, there was greater innovation to achieve the packet domain and business communications, good quality of service (QoS) architecture and signaling system gradually transition to the orthogonal frequency division multiple access (OFDMA) method, to support adaptive modulation and coding (AMC), hybrid automatic repeat request (HARQ) and multiple-input multiple-output (MIMO) and other enhanced strategy, but simply provides standards broadband wireless access network air interface part of the integrity of the system need further improvement. Is generally believed that only support broadband wireless access network and special network, but also support broadband Internet systems integration, for example, broadband wireless access network with dedicated IP core network (such as the NGN / IMS) constitute the telecom network integration, integration with public Internet constitutes a broadband wireless Internet access. However, industry perspective, broadband wireless access systems such as the rapid development to at least have to address other four issues, is the killer business, good operating frequency, low power consumption and the public Internet terminal core support capabilities. In today by IEEE802.16 family of standards-based broadband wireless access system, if not properly address these issues in the process of industrialization will inevitably encounter many unexpected difficulties.
Since 2003, China has considerable influence in the research project started FuTURE selectively to the key technology in the broadband wireless access research content and has achieved a series of important results, and accumulated a considerable amount of intellectual property . Also by the impact of the international situation, China began to develop at all levels of ISO IEEE802.16 series of standards corresponding to the industry standard, and brewing-related national standards. The more influential ministries from China 3 (China National Development and Reform Commission, Ministry of Information Industry, Science and Technology) jointly set up the broadband wireless access working group, China Communications Standards Association TC5WG3 Working Group and the China National Standardization Committee on Broadband Wireless Multimedia Information Standards Working Group.
Compared with other working groups, China National Standardization Committee of the broadband wireless communication standards of the position and the typical multi-media broadband wireless access system is obviously different, is independent broadband wireless access systems and digital terrestrial television system, internal integration, technical basis mainly from the FuTURE research projects, the China Next Generation Internet (CNGI) research program and China's enactment of the autonomy of mobile TV standards, and to some extent absorbed the advantages of IEEE802.16 series of standards. Broadband Wireless Multimedia standard recommended ultra-high frequency (UHF) band, but also support the other bands (eg 3.5GHz) running; can be decomposed into a broadcast television systems and broadband wireless access system operating alone, but also support joint operations, the wireless "triple play" an effective means to solve; recommended based on peer to peer (P2P) Session Initiation Protocol (SIP) Smart node overlay network (superimposed on the public Internet QoS guarantee a certain virtual network) as a broadband wireless multimedia access network's core network, but also support and NGN / IMS interfaces. In the uplink air interface for low-power optimization using generalized multicarrier (GMC) technology.
1 broadband wireless multimedia access network of key technology
This article focuses on wireless broadband multimedia access network involved in key technologies, including wireless network infrastructure, the physical layer and MAC layer of the key technologies critical technology. On the other key technologies, such as sub-layer security encryption technology, core network technology, space is limited not elaborate. I am a professional editor from China Product, and my work is to promote a free online trade platform. http://www.himfr.com/ contain a great deal of information about welding gloves , disposable nitrile gloves welcome to visit!
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