Method and arrangement for making handover decision in mobile communication system

Abstract

The invention relates to a method and arrangement for making a handover decision in a mobile communication system of multilayer radio coverage, which comprises measuring at a mobile station (MS) a radio signal transmitted by a base station (BTS) of a microcell, and reporting the measurement results at substantially regular intervals. The invention is characterized by determining a relative speed for the mobile station on the basis of the number and classification of the measurement results received at substantially regular intervals. Mobile stations moving at a speed slower than the relative speed are defined as slow moving and commanded to register in the base station of a suitable microcell (A, B, C).

Description

technical field [0001] The invention relates to a method and a device for making a handover decision in a mobile communication system comprising at least one microcell, the coverage area of ​​which is located at least predominantly within the coverage area of ​​another cell. The method comprises: measuring, at the mobile station, radio signals transmitted by the base station of the microcell; and reporting the results of the measurements at substantially regular intervals; and commanding a mobile station defined as a slow moving mobile station to handover to an appropriate base station of the microcell . Background technique [0002] In cellular mobile communication systems, radio coverage areas are implemented with different cell sizes and often even with multiple cell layers. Cells with very small coverage areas, ie micro cells, are used eg in areas that are difficult to cover or require high user capacity. Large coverage areas are achieved using macro cells, which usual...

AI Technical Summary

Problems solved by technology

The problem with this solution is that the handover from the macrocell to the microcell is made based on the instantaneous location of the mobile station, the handover is only limited by the arrival of the mobile station in the coverage area of ​​the microcell and a predetermined period of time from when the mobile station arrives in this area The effect of the position of the mobile station after that, during this time, the fast moving mobile station may have left the area of ​​the micro cell and returned there again, in which case the system performs a handover from the macro cell to the micro cell

The problem with this embodiment is that the solution is based on instantaneous measurements, which are not always exactly true

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