Method for reducing continuous hard handoffs between base stations in CDMA mobile communication system

Abstract

A reduction method of successive hard handoffs which prevents the call from dropping and the communication quality from deteriorating which are caused by the successive hard handoffs frequently occurring between base stations according to the system resources in the CDMA mobile communication system is disclosed. The reduction method includes the steps of making a decision on soft or hard handoff possibility according to the strength of the pilot signals of the existing base station holding a current call and the newly added base station by using the pilot strength measurement message received from the mobile station, informing the control station of the resource assignment possibility of the added base station by using the handoff request message transmitted from the control station to the added base station, and performing or completing handoffs according to said resource assignment success or failure. Therefore, since, hard handoffs in this method occurs after the mobile station is completely transferred to the added base station, the frequency of the hard handoff occurrences is reduced.

Description

technical field [0001] The present invention relates to a method for reducing continuous hard handover between base stations in a code division multiple access (CDMA) mobile communication system, specifically, relates to a reduction method for continuous hard handover between base stations, so as to prevent frequent Call loss or poor communication quality due to successive hard handoffs between base stations that occur. Background technique [0002] Generally, in a CDMA mobile communication system, handovers between adjacent base stations often occur, and they are one of soft handovers and hard handovers according to the resources of the system. Since continuous handovers have adverse effects on communication quality, call loss and system capacity, reducing frequent handovers has been one of the focus of the problem. [0003] figure 1 It is a multi-frequency form diagram representing an ordinary CDMA mobile communication system. The system includes: a terminal base statio...

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Problems solved by technology

[0018] However, in the above-mentioned general handover reduction method, since the balance of transmission power among base stations cannot be maintained or a large number of high-rise buildings are relatively dense, the pilot strength received by the mobile station varies greatly, and it is difficult to determine the precise distance to the mobile station. Estimated that there may be frequent handoffs between neighboring base stations when a call is set up

Furthermore, if there is no channel resource associated with the correspo

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