Chapter 7. The Upper Protocols of the Transport Group
The lower transport protocols are optimized to deal with the hostility of the RF transmission medium, user requirements for low cost and power consumption, security concerns, regulatory issues, and so on. These design points have led to, among other things, selection of the TDD, polling-based medium access protocol at the baseband. While this approach is suitable for operation of Bluetooth systems in the 2.4 GHz ISM band, the small size of a BB_PDU does not fare so well with the much larger packet sizes typically encountered with Internet and other similar traffic.
It was thus recognized early on that an adaptation layer was needed to move larger upper-layer PDUs and smaller lower-layer PDUs ...
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