The Hong Kong Applied Science and Technology Research Institute Company Limited (ASTRI)'s WiFi telephony solution was developed using Freescale's ColdFire platform. The development board is less than 7cm, which meets the portability required by users. . Through the wireless local area network with the universal Sip protocol, users can access the Internet to make VoIP calls at high speed in areas with WiFi hotspot access and in areas covered by wireless routers such as homes and offices. This article describes the main performance characteristics of ASTRI's WiFi telephony solution, system architecture diagram, software architecture diagram and ASTRI WiFi telephony platform.
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In recent years, WiFi technology has developed rapidly. In some parts of Europe and the United States and Hong Kong, China has achieved WiFi, and more cities are also stepping up the coverage of broadband WiFi access points for enterprises and homes, with the growth rate in some regions of developing countries. When talking about this development status, Mr. Li Shaohui, Commercial Director of Hong Kong Applied Science and Technology Research Institute Co., Ltd. (referred to as Hong Kong ASTRI) said that the popularity of WiFi is getting stronger and stronger, but the actual support and application are not much compared. The voice market is clearly a hot spot for WiFi applications after laptops.
According to its analysis, the voice market itself is relatively mature, and its value in the market is very high. The portable WiFi phone that combines WiFi and mobile VoIP technology that can transmit voice will gain considerable development. In 2007-2008, the WiFi phone market actually grew by 60%. It was learned from the reorganization plan of China's telecom industry announced not long ago that the new network coverage will open up the Internet barrier and realize the seamless connection between fixed network and mobile network, which will lay a good foundation for the development of wireless Internet, and will also be WiFi. The development of wireless business has created a good industrial environment.
Hong Kong ASTRI's portable WiFi phone design
The WiFi phone solution developed by ASTRI based on the ColdFire platform has a development board of less than 7 cm, which satisfies the portability required by users. Through the wireless local area network with the universal Sip protocol, users can access the Internet to make VoIP calls at high speed in areas with WiFi hotspot access and in areas covered by wireless routers such as homes and offices. The high transmission speed of WiFi, coupled with Hong Kong ASTRI's efforts in low power consumption, low cost, high mobility and high voice quality, can provide users with an economical and efficient choice. The Hong Kong ASTRI WiFi phone design is currently in mass production.
Main feature
1, in accordance with industry standards
SIP (RFC 3261)
Wireless 802.11
2, can adapt to the firewall network address conversion method
STUN, rport
3. Cross-border registration
Different AP cross-office registration
4, multiple call functions
Call hold, call waiting, call transfer, call transfer, caller ID, etc.
5, intelligent power management
Talk time > 3 hours, standby time > 48 hours
System structure diagram (Figure 1)
Software structure (Figure 2)
ASTRI WiFi phone platform (Figure 3)
ASTRI WiFi Phone Development Board Outline Drawing:
Hong Kong Academy of Sciences and Freescale's cooperation
The Hong Kong Academy of Sciences was established in 2001. Its cooperation with Freescale began in 2005. The research projects are mainly enterprise and consumer electronics. At the time, Freescale had a technical support team in Hong Kong, which was necessary for a young company. In addition, Freescale's brand quality, technology level, maturity and cost performance of chip solutions are important considerations. In the WiFi phone project, ASTRI selected Freescale's ColdFire microprocessor, which they believe is largely satisfied with cost, power, voice processing and underlying platforms. R&D and customer needs.
ColdFire is a microprocessor chip developed by Freescale on the basis of M68K. This series of chips not only has microprocessor features such as on-chip Cache, MAC and SDRAM controllers, but also various interface modules such as GPIO and QSPI. Microcontroller features such as UART, Fast Ethernet Controller and USB. Therefore, the ColdFire series chip combines the high speed of the microprocessor and the ease of use of the microcontroller.
The ColdFire family of microprocessors continues to innovate, helping users reduce memory space, power consumption, system board size and system cost, providing a cost-effective solution for embedded product vendors. Mr. Li Shaohui said that it can provide higher integration and lower power consumption, which is the main reason why ASTRI chose ColdFire microprocessor. Based on the chips provided by Freescale, ASTRI has made a lot of optimizations in terms of power consumption and WiFi transmission stability. On the one hand, they have opened up the market for themselves, and on the other hand, they have played a certain role in Freescale's chip promotion. effect.
Today, cooperation has gone through three years. The Hong Kong Academy of Sciences is very optimistic about the prospects for continued cooperation. When talking about how IDH can reduce its dependence on chip companies, Mr. Li said that the transparency of the cooperation between the two parties is very important. Whether it is the platform or other OS source code or the processing of power consumption, etc., it can be properly opened to facilitate The two sides cooperate better. He also said that future chip prices, power consumption, etc., will be more in line with market trends, and hope that both Freescale and other chip companies will give IDH more and more direct support.
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