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Implementation and Simulative Investigation of a Location Based Controlled 802.11 Handover Mechanism


The mobile client initiated handover mechanisms for 802.11 being currently deployed lead to unacceptable long interruptions of the link layer connection due to the required scanning phase. If the quality of an established connection falls below a certain threshold, the mobile client has to break the connection and use its transceiver for the detection of a more suited access point.

Beside the long interruption of the connection, several other drawbacks emerge. For instance, a client may associate with an access point and leave its coverage area shortly after the establishment of the new connection because the location of the access point is in the opposite direction of the client's movement.

One possibility to overcome this drawback is to introduce the locations of the access points to the mobile clients. This can be achieved by some enhancements of 802.11 amendments being currently in the standardization process. By possessing the positions of the access points, a client can make handover decisions dependent on its current movement in order to avoid long scanning phases, short time connections and frequent handovers.

  • Experience in C/C++ programming
  • TKN lectures and exercises course on communication networks

The task of this project is the specification of the enhancements for the 802.11 amendments (with the help of the project's tutors) that might be contributed to the standardization. The enhancements shall be integrated in an existing simulation model for 802.11. Then, a simulative comparison of the new approach with a standard 802.11 handover mechanism shall be conducted.

Comments n/a
Literature n/a
Useful Links n/a
Contact Marc Emmelmann <>


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