HSCSD and GPRS: The way of personal multimedia service

There is no doubt that GSM is the technology that enables mobile phones to enter the global consumer market. The Nordic countries, Hong Kong and Australia lead the penetration of mobile communications, and GSM has the potential to continue to achieve global success on the world market. New wireless data technologies, such as high-speed circuit-switched data (HSCSD) and general Packet Radio Services (GPRS), are now being marketed by all major companies in the telecommunications industry.

These new technologies foster the integration of mobile telecommunications and data communications into a fresh business of mobile information. This change is a precursor to the industry shift, reflecting user needs and effectively combining the Internet with GSM. While meeting the potential needs of the bulk market and mobile data business, it will also bring exciting business opportunities for the business.

High-speed Circuit Exchange data: (HSCSD)

HSCSD for the current wireless data communication solves a problem-Brett rate. Current applications (such as email and remote LAN access) and new applications (such as wireless imaging and wireless video) will benefit from higher Brett rates than the current GSM data service. HSCSD only a small amount of additional investment, its data passing rate is six times times faster than the current GSM.

This technique was approved and stipulated by ETSI in February 1997, and a new channel coding scheme was adopted to Brett the time slot. Increase from the current 9.6kbit/s to the 14.4kbit/s. HSCSD also enables time slots to be combined so that the data rates of 9.6kbit/s or 14.4kbit/s multiples become possible. This means that the operating company will be able to provide GSM users with a variety of new Brett rates, from 9.6kbit/s to 57.6kbit/s. The HSCSD Brett rate of 57.6kbit/s is equivalent to a ISDNB channel; GSM data will be the same as the existing PSTN modem business. The endpoint is used to compress the endpoint, and the rate can reach 200kbit/s. The network can easily provide more time slots for data services when not busy with other traffic, thus increasing the total utilization of the busy time capacity. (Computer science)

HSCSD due primarily to software upgrades (possibly with remote access), no new network components are required. Therefore, the GSM operator not only eliminates the necessary redesign of the network, but also can implement it quickly. However, the user does need a new terminal. HSCSD does not require users to learn a new data business or technology, which is very similar to the existing business and is actually much faster. For example, the mobile navigation business and other applications featuring maps and graphics will benefit greatly from the enhanced performance of this technology, making applications more convenient and attractive. But HSCSD will also create completely new applications, such as mobile video. HSCSD was originally used primarily with portable computers. Therefore, the business sector is the most necessary part of the service, it has a more complex data services for wireless Office applications and Internet access.

HSCSD will provide the market before GPRS. The advantages of HSCSD can be summarized as follows:

Rapid launch of HSCSD business allows operators to absorb business users and win competition

No major infrastructure investment (remote software upgrades only) can launch high-speed business, investment province, quick

When not busy, the network can easily provide more time slots for the data service, thus increasing the total utilization of the busy time capacity.

General Packet Radio Service: (GPRS)

Some new applications in the past in GSM is not available, the adoption of GPRS will become possible, it has more attractive wireless internet access, so as to participate in the great development of the internet opened the door. Using GPRS, the data is encapsulated into each packet and sent online. The network capacity is allocated only when needed, that is, in the time that a group is being sent. Released immediately when the packet is no longer needed for this capacity, so it provides immediate connectivity and high pass rates. This technology revolutionized the Internet access of operators and users after 2000.

The data to be transferred is encapsulated in some short groupings, and the grouped letterhead contains the original and endpoint addresses. These groupings are then sent one by one on the transmission line. A group of users from a user can take a different route to the receiver in the network. All packets from different users are inserted together so that the volume of transmission is shared without the preset time slot. Instead, the network capacity is allocated only when required, and is released when not. This technique is called statistical multiplexing, which compares static time-division multiplexing with the retention of slots for users regardless of capacity usage (e.g., when using GSM voice and circuit Exchange data). GPRS updates the GSM data service to make it more compatible with LAN, WAN, and Internet.

GPRS provides a very flexible Brett rate, from 100bit/s to greater than 100kbit/s. A variety of applications less than the momentary gap can benefit from GPRS functionality, allowing several users to share a time slot. Sending a 500-byte packet on a slot takes about 500 milliseconds, after which the packet arrives at the end of the GPRS backbone, perhaps including a series of networks, such as the Internet. The use of links preserves the capacity of the network and the air interface, and allows the operator to provide a more inexpensive business because the charges can be based on data sent or received.

Operators using GPRS will have a large number of new applications, including remote control to the maintenance of vending machines, mobile credit card verification, remote electrical meter readings and any monitoring business. Video services, stylistic sharing and wireless imaging with instant images will also be possible on the mobile web.

Given the breadth of GSM coverage, GPRS will provide a truly global market for access to the Internet and other packet networks. These applications are similar to users because all of the existing TCP/IP based applications can use GPRS, as if they were connected to a LAN network. GPRS also provides an extremely fast conversation establishment; users can stay online for a long time but only pay for all the capacity.

For operators, GPRS will fully open the new market segments and applications, but also to the wireless internet to the bulk market. From a network point of view, the main advantage is the ability to profit from idle capacity, otherwise these capacity can only be used to deal with peak time business volume. However, GPRS will require both the air interface and the base station system to be changed to enable the transmission of such packet modes. In addition, new network components will have to be introduced.

The advantages of GPRS can be summarized as follows:

GPRS can provide global wireless access to Internet and other packet networks because of the wide range of GSM network

All existing TCP/IP applications can be combined with GPRS, as well as LAN

GPRS also provides an extremely fast conversation establishment; users can stay online for a long time but only pay for all the capacity.

Conclusion

GPRS provides an essential step for the landing of UMTS, whether from the perspective of the network or the business evolution. It is obvious that GPRS has many advantages over Internet connection compared with HSCSD. However, there is a large number of PSTN modems and the installation base of ISDN terminals. HSCSD is the best solution to connect these services and other circuit-switching services, especially for time-critical applications. Therefore, the HSCSD and GPRS have a clear market needs.

Wireless data has a solution that is expected to instantly connect anyone from any location to any information. At present, it is basically a slow running of small data on The voice line. However, in the coming years, the surge in applications and multi-function terminals will push wireless data communications and revenue to a new level, which will be enough to compete with voice communications. For mobile operators, access to wireless data management is a major business and technology transfer, so the use of HSCSD and GPRS can be achieved early start of the phased approach is the key to business success.