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To: Eric L who wrote (15280)	9/25/2001 6:12:43 PM
From: 49thMIMOMander	Respond to of 34857

Annex C (informative): Principles for AMR codec mode adaptation with TFO This annex C describes the procedures that are used for the codec mode adaptation of an Adaptive Multi-Rate (AMR) call over two radio links when Tandem Free Operation (TFO) is active between them. The mechanism to initiate TFO between AMR calls is described in GSM 08.62. It is considered as a prerequisite that a common Active Codec Set has been defined between the BSSs (by the TFO_Protocol) and that TFO is ongoing with the same Active Codec Set on each side. The codec mode used in one direction may be different from the one used in the other direction, but for one direction the same codec mode is used from one MS to the other MS. The codec mode adaptation is performed independently on each direction, but in one direction the codec mode adaptation is triggered by both radio interfaces. The principle for codec mode adaptation in ongoing TFO is always that the BTS controlling the MS takes the final decision to upgrade or downgrade its local uplink direction. This BTS sends the Codec Mode Command downlink. The Codec Mode Request for the local uplink direction is taken directly into account and the effective delay is not higher than in normal connections. The Codec Mode Request from the remote side in the remote downlink direction is also taken into account, but it becomes active with a reaction time increased by the round trip delay between both BTSs. Upgrading is possible only if both radio links in one direction (first uplink then downlink) are good enough. Downgrading is necessary already if one (or both) radio link is not good enough. 0509-760.doc.. time to get some sleep.. Getting ready for EDGE.