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For circuit-switched services, the A interface can handle 64 kb / s per user, which is not exceeded by EDGE circuit-switched bearers. [9] 2.1. Impact on GSM Network Planning An important prerequisite, which to a large extent will determine the success of EDGE in GSM, is that a network operator be able to introduce EDGE gradually. For initial deployment, EDGE-capable transceivers will supplement standard GSM / GPRS transceivers in a subset of the existing cells where EDGE coverage is desired. Here, an integrated mix of GSM, GPRS, and EDGE users will coexist in the same frequency band.
To minimize effort and cost for the network operator, radio network planning (including cell planning, frequency setting of power and other cell parameters) must not require extensive modification. 2.1.1. Coverage Planning One characteristic of non-transparent radio link protocols that include automatic repeat request (ARQ), is that low radio link quality only results in a lower bit rate for the user. Here, low SIR for a user does not result in a dropped call, as for speech, but in a temporary decrease of user bit rate.
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For transparent bearers, which typically offer a constant bit rate, link quality control must be extended to incorporate resource allocation, in the sense that the number of dynamically allocated time slots sets the bit rate and bit error rate (BER) retirements. Transparent bearers, will so be available in the GSM GSM cell, but require fewer time slots in the center of the cell (where 8-PSK coding schemes can be used). 2.1.2. Frequency Planning Most mature GSM networks of today have an average frequency reuse factor of around 9 (meaning that available frequencies are divided into nine frequency groups). However, there is also a trend towards tighter reuse factors.
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.
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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. 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.
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