This paper investigates influence of femtocells to the traditional mobile network hierarchy and their features. This upcoming technology is supposed to be widely deployed in the upcoming wireless and mobile networks. These small base stations are designed to improve indoors capacity, reducing macro cell traffic or to provide services in locations without signal or with weak coverage. The paper discusses usage of femtocell and related challenges, such as interferences, frequency spectrum planning, handovers or integration of femtocells into mobile networks.
The paper investigates the impact of non-standard implementation of Managed roaming in a GSM provider network. This non-standard implementation can cause variety of problems in the host network. This paper describes and demonstrates a solution how to protect the host network entity VLR against to the non-standard usage of Managed roaming procedure. Our proposition is based on modification of Location Update and Authentication procedures. The functionality of modified procedure was successfully verified by testing in real mobile networks.
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