A Locally Optimal Handoff Algorithm for Cellular Communications


£ —The design of handoff algorithms for cellular communication systems based on mobile signal-strength measurements ¤ is considered. The design problem is posed as an optimization to obtain the best tradeoff between the expected ¥ number ¦ of service failures and expected number of handoffs, § where a ¨ service failure is defined to be the event that the signal str © ength falls below a level required for satisfactory service to the subscriber. Based on dynamic programming arguments, an optimal solution is obtained, which, though impractical, can be used as a benchmark in the comparison of suboptimal schemes. A simple locally optimal handoff algorithm is derived from the optimal solution. Like the standard hysteresis algorithm, the locally optimal algorithm is characterized by a single threshold. A systematic method for the comparison of various handoff algorithms¨that are akin to the receiver operating characteristic (ROC) curves of radar detection is presented. Simulation results show © that the locally optimal algorithm outperforms the hystere-sis © algorithm, especially in situations where accurate prediction of signal strength is possible. A straightforward technique for adapting¨the locally optimal algorithm to changing environments is suggested. That natural adaptability is the algorithm's principle advantagë over current approaches.

4 Figures and Tables

Showing 1-10 of 18 references

A framework for optimal scheduling of handof f fs in wireless networks

  • M Asawa, W E Stark
  • 1994

Error statistics of real-time power measurements in cellular channels with multipath and shadowing

  • A J Goldsmith, L J Greenstein, G J Foschini
  • 1994

Velocity adaptive handoff algorithms for microcellular systems

  • M D Austin, G L Stüber
  • 1994

A model for analyzing handoff algorithms

  • R Vijayan, J M Holtzman
  • 1993

Analysis of handover algorithms

  • M Gudmundson
  • 1991

Correlation model for shadow fading in mobile radio systems

  • M Gudmundson
  • 1991
1 Excerpt
Showing 1-10 of 22 extracted citations