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8.6.4 8.6.4

As far as SEAMCAT is concerned, the actual CDMA power control algorithm looks merely like a black box that maps link quality to channel power. However, the mapping is not simply one-to-one. Depending on the conditions of the mobile user, the same link quality can map to different channel power requirements. A key parameter that determines the condition of a user is called the “geometry”.  The higher the geometry, the more favorable the UE’s condition is. The geometry is defined as:

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Note that symmetry between the two soft handover legs (links with BS’s in the active set) is assumed. Therefore, when a user is connected to two BS’s, it receives equal power from each link. The determination of the traffic channel power levels for each user cannot be done in a single step. The inherent assumption in equations 37 and 38 is that Ptotal_active is known. However, Ptotal_active itself is the sum of the pilot, overhead and all traffic channel power levels received from the BS’s in the active set. Therefore, an iterative process is required to determine the individual traffic channel received power levels.

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F199 F199

Figure 199: Power Control Loop

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