HIGH SPEED CIRCUIT SWITCHED DATA HSCSD PDF

HSCSD, or High Speed Circuit Switched Data, is an upgrade to the existing Time Division Multiple Access (TDMA) cellular phone system. HSCSD (High Speed Circuit Switched Data) is a specification for data transfer over GSM networks. HSCSD utilizes up to four Kb or Kb time slots, for a. High-Speed Circuit-Switched Data (HSCSD), is an enhancement technlogy of Circuit Switched Data (CSD), the original data transmission mechanism of the.

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The user is then charged, often at a rate higher than a normal phone call, and sometimes multiplied by the number of time slots allocated, based on the period of time that the user has a connection active.

Total users on TelecomSpace: February Learn how and when to remove this template message. Prior to CSD, data transmission over mobile phone systems was done by using a modem, either built into the phone or attached to it. One physical channel is one burst period per TDMA frame.

Circuit Switched Data – Wikipedia

WikiProject Telecommunications ccircuit be able to help recruit an expert. Four times faster than GSM, with a transfer rate of up to This means that in the best conditions CSD uses a single radio time slot to deliver 9.

Higher speeds are achieved as a result of superior circcuit methods, and the ability to use multiple time slots to increase data throughput. The difference comes from the ability to use different swiitched methods and even multiple time slots to increase data throughput. Jump to page content Accessibility. At the same time, the speech-oriented audio compression used in GSM actually meant that data rates using a traditional modem connected to the phone would have been even lower than with older analog systems.

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Each of these carrier frequencies is then divided in time using a TDMA scheme. The original error correction used in GSM was designed to work at the limits of coverage and in the worst case that GSM will handle. The error correction used in GSM is designed to work at the limits of coverage and in the worst case that GSM will handle. This allows an switchde in maximum transfer rates using four time slots up to This contrasts with the more widely adopted GPRS.

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Circuit Switched Data

Assuming a standard Circuit Switched Data transmission rate of HSCSD require the time slots being used to be fully reserved for a single user.

From Wikipedia, the free encyclopedia. This means that a large part of the GSM transmission capacity is taken up with error correction codes.

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High-Speed Circuit-Switched Data

HSCSD operates across a GSM network, and therefore no extra hardware is required by a mobile communications operator to offer the service, just a network software upgrade. In a GSM network single slots are allocated to each user, which has a standard data transfer rate of 9. Articles lacking sources from February All articles lacking sources Articles needing expert attention with no reason or talk parameter Articles needing expert attention from February All articles needing expert attention Telecommunications articles needing expert attention Use dmy switcged from February Channels are defined by the number and position of their corresponding burst periods.

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Views Read Edit View history. This page was last edited on 21 Juneat This article needs attention from an expert in Telecommunications. By using this site, you agree to the Terms dataa Use and Privacy Policy. It is possible that either at the beginning of the call, or at some point during a call, it will not be possible for the user’s full request to be satisfied since the network is often configured to allow normal voice calls to take precedence over additional time slots for HSCSD users.

Since radio spectrum is a limited resource shared by all users, a method must be devised to divide up the bandwidth among as many users as possible. It requires the time slots being used to be fully reserved to a single user. This means that a large part of the GSM transmission capacity is taken up with error correction codes.

One or more carrier frequencies are assigned to each base station. Who’s online There are currently 0 users online.