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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As with CSD, channel allocation is done in circuit switched mode.

The difference comes from the ability to use different coding methods and even multiple time slots to increase data speed. As such, there is a direct trade-off between greater speed and the associated cost from using more radio resources- it is expensive for end users to pay for multiple simultaneous calls. Assuming a standard Circuit Switched Data transmission rate of Even given preemption, it is difficult to see how HSCSD can be deployed in busy networks and still confer an agreeable user experience- i.


HSCSD is therefore more likely to be deployed in start up networks or those with plenty of spare capacity- since it is relatively inexpensive to deploy and can turn some spare channels into revenue streams. The first innovation in HSCSD was to allow different error correction methods to be used for data transfer.

High Speed Circuit Switched Data (HSCSD) in The Network Encyclopedia

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 means that a large part of the GSM transmission capacity is taken apeed with error correction codes.

HSCSD provides several levels of possible error correction which can be deployed according to the quality of the radio link. This means that in the best conditions The second innovation in the HSCSD radio interface was the possibility to use multiple time slots at the same time.

This allows an increase in maximum transfer rates using four time slots up to HSCSD require the time slots being used to be fully reserved for a cirduit user. Hih 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 so that normal voice calls take precedence over additional time slots for HSCSD users.


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. Skip to main content.

High-Speed Circuit-Switched Data

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