Encoding technique edge

9 EDGE known encoding techniques, the MCS (Modulation Coding Scheme) 1 to MCS9. While in GPRS only used 4 pieces of encoding techniques, ie CS (Coding Scheme) 1 to SC4. The first four coding techniques on EDGE, MCS1 to MCS4, using GMSK modulation, the same as that used in GPRS. Whereas 5 other coding techniques, MCS5 to MCS9, using 8PSK modulation.

Both the GPRS or EDGE, the level of coding schemes which offer higher data speeds are higher too, but in addition, more tingggi levels pengkodeannya scheme, then the resistance to lower the error. That is, the higher speed data packet, then the easier the data packet having an error in the shipment. This is because, the higher the level pengkodeannya scheme, the level of mechanisms "error correction" is used even lower.

Although MCS1 to MCS4 the same EGDE uses GMSK modulation as CS1 to CS4 on GPRS, but both have different speeds. This is because of the use of different headers. In EDGE, the data packet contains a header that permits resegmentasi data packet. That is, if a data packet sent with a level of high coding scheme (higher speed, less error correction) and the data was not well received at the receiver side.

After a re-transmission request (retransmissions) of the data packet is received, the next delivery, the encoding scheme used can be changed and adjusted to the condition of the radio interface. That is, the next delivery, the data packet will be sent using the encoding scheme is lower, which has an error correction mechanism better. Which is expected in this second delivery data can be well received at the receiver side.

Unlike with GPRS, resegmentasi this data packet can not be done. Therefore, when a data packet has been sent by using a specific coding scheme. So although the data is received either on the receiver side, when the next delivery, the data will still be sent by using the same encoding scheme. Making it more likely that any data packet received at the receiver side is still as great as when the first shipment. Thus a balance is achieved between the transfer speed and quality of data being transferred.