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General Packet Radio Service (GPRS), initiated in 1994, is an ETSI standard for packet data transmission using the core GSM (Global System for Mobile Communications) radio access network. GPRS shares the GSM frequency bands with telephone and circuit-switched data traffic, and makes use of many properties of the physical layer of the original GSM system. Since radio resources of a cell are shared by both the GPRS and GSM voice services, how to efficiently allocate radio resources between these two services and at the same time not degrading the QOS of voice service is an important issue. Guard channels can be temporarily allocated to GPRS connections to improve channel utilization. As voice traffic load increases, the channels of some ongoing GPRS connections are de-allocated to arriving voice calls.
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