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With the use of frequency hopping, multiple reuse patterns (MRP), and discontinuous transmission (DTX), reuse factors as low as 3 become feasible. EDGE supports a variety of reuse patterns. In fact, by its use of link quality control, EDGE can be introduced in an arbitrary frequency plan, and benefit from high SIR closer to the base stations. EDGE can be introduced in an existing GSM frequency plan, and that it also supports future high-capacity solutions based on tighter frequency reuse.

2.1.3. Radio Network Planning An important prerequisite (and to a large extent, one that will determine the success of Edge) is that network operators should be able to introduce Edge gradually. The initial deployment of Edge-capable transceivers will supplement standard GSM transceivers in a subset of cells where Edge coverage is desired. An integrated mixture of circuit-switched, GPRS and Edge users will thus coexist in the same frequency band. To minimize operator efforts and costs, Edge-related implementation must not require extensive modification of the radio network plan (including cell planning, frequency planning, the setting of power levels and other cell parameters). 2.1.4. Channel Management After Edge has been introduced, a cell will typically include two types of transceiver: standard GSM transceivers and Edge transceivers.

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Each physical channel (time slot) in the cell can be viewed as being one of at least four channel types: 1. GSM speech and GSM circuit-switched data (CSD); 2. GPRS packet data; 3. Circuit-switched data, enhanced circuits witched data (ECSD), and GSM speech; 4. Edge packet data (EGPRS), which allows a mix of GPRS and EGPRS users simultaneously. While standard GSM transceivers only support channel types 1 and 2, Edge transceivers support all four channel types. Physical channels are dynamically defined according to terminal capabilities and needs in the cell.

For example, if multiple speech users are active, the number of type-1 channels is increased, at the expense of GPRS and Edge channels. Obviously, channel management must be automated, to avoid the splitting of channels into static groups. Otherwise, trunking efficiency would diminish. 3. Interleaving To increase the performance of the higher coding schemes in EGPRS (MCS7 to MCS9) even at low C / I, the interleaving procedure has been changed within the EGPRS standard. When frequency hopping is used, the radio environment is changing on a per-burst level.

Because a radio block is interleaved and transmitted over four bursts for GPRS, each burst may experience a completely different interference environment. [7] If only one of the four bursts is not properly received, the entire radio block will not be properly decoded and will have to be retransmitted. In the case of CS4 for GPRS, severely any error protection is used at all. With EGPRS, the standard handles the higher coding scheme differently than GPRS to combat this problem. MCS7, MCS8 and MCS9 actually transmit two radio blocks over the four bursts, and the interleaving occur over two bursts instead of four. This reduces the number of bursts that must be retransmitted should errors occur.

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The likelihood of receiving two consecutive error free bursts is higher than receiving four consecutive error free bursts. This means that the higher coding schemes for EDGE have a better robustness with regard to frequency hopping. 4. EDGE & GPRS EDGE, or the Enhanced Data Rate for Global Evolution, is the mantra in the Global Internet Connectivity scene. EDGE is the name for GSM 384. The technology was named GSM 384 because of the fact that it provided Data Transmission at a rate of 384 Kbps. It consist of the 8 pattern time slot, and the speed could be achieved when all the 8 time slots were used.

The idea behind EDGE is to obtain even higher data rates on the current 200 KHz GSM carrier, by changing the type of the modulation used. Now, this is the most striking feature.

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