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Additional resources for ARRL's RF Amplifier Classics: Practical Designs and Construction Details from the Pages of QST and QEX
4 Chapter 1 HANDOFF CRITERIA Several variables have been proposed and used as inputs, or handoff criteria, to handoff algorithms. The handoff criteria discussed here include RSS, SIR, distance, transmit power, traffic, call and handoff statistics, and velocity. • Received Signal Strength. This criterion is simple, direct, and widely used. There is a close relation between the RSS and the distance between the BS and the MS. The lack of consideration of CCI is a disadvantage of this criterion. , topographical changes, shadowing due to buildings, and multipath fading, can cause the actual coverage area to be quite different from the intended coverage area.
The objective is to find a combination of BS assignment and transmit power to provide a feasible solution to the minimum transmit power (MTP) problem. An algorithm called minimum power assignment is proposed, which iteratively solves the MTP problem. During an iteration of the algorithm, the MS chooses a combination of BS and transmit power for which minimum power is needed to maintain an acceptable SIR (assuming that the other MSs transmit fixed powers at that time). Handoff and Radio Resource Management in Cellular Systems 35 Hanly  also proposes a similar combined power control and BS selection algorithm to achieve higher capacity in a spread spectrum cellular system.
Simulation results show this algorithm to be better than a relative signal strength based algorithm. Kelly  views signal strength based handoff as an optimization problem to obtain a tradeoff between the expected number of handoffs and the number of service failures, events that occur when the signal strength drops below a level required for an acceptable service to the user. An optimal solution is derived based on dynamic programming and is used for comparison with other solutions. The handoff problem is defined as a finite horizon dynamic programming problem, and an optimal solution is obtained through a set of recursive equations.