In LTE, TFTs are installed at the mobile and at the P-GW in order to determine if a particular traffic stream needs to traverse a particular EPS bearer. As such, when a Dedicated EPS bearer is established, an uplink TFT is installed at the handset and a downlink TFT is installed at the P-GW. The TFT itself contains packet filters which are based on potential packet characteristics such as IP address and port.
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