Handover

About: Handover is a research topic. Over the lifetime, 24219 publications have been published within this topic receiving 296416 citations. The topic is also known as: handoff.

OpenNet: A simulator for software-defined wireless local area network

Abstract: This study is motivated by a plan to install a software-defined wireless local area network (SDWLAN) on campus, which possesses a desired property that both data flow and device behaviors can be software-definable. Because the installation involves hundreds of access points, we must conduct simulations beforehand to verify the design and scalability of the target system. However, existing SDN simulator like Mininet does not support modeling of wireless channel and mobility. On the other hand, common network simulator like ns-3 only has limited support for software-defined controllers and does not fully implement handover process. We thus develop OpenNet, which connects Mininet to ns3 to enjoy both Mininet's advantage of controller compatibility and ns-3's ability in the wireless/mobility modeling. OpenNet also complements ns-3 by adding probe mechanism, which is missing in the current ns-3 implementation. Our simulation result demonstrates the effectiveness of OpenNet.

Cellular communication system, method for inter-cell handover of terminal and macro base station

Abstract: The present invention discloses a cellular communication system, an inter-cell handover method for a UE, and a macro base station. The cellular communication system includes a macro base station and at least one micro base station within coverage of the macro base station. The macro base station is configured to: establish a control channel for a UE served by the micro base station; perform an access management operation for the UE served by the micro base station within the coverage of the macro base station; and receive a handover request of the UE and hand over the UE to another micro base station within the coverage of the macro base station. The micro base station is configured to establish a data channel for the accessed UE and perform data transmission with the UE. With the present invention, the control plane of the user served by the micro base station can be separated from the data plane of the user, so that the resources of the micro base station can be better used for data communication. Hence, the negative impacts on the system which are caused by the coexistence of macro cells and micro cells in the networking can be reduced.

Method for transmitting measurement reports in a mobile communications system

Abstract: A service node is provided in a mobile communications network which collects radio link measurement reports which are transmitted to the service node by mobile stations. The mobile stations transmit the measurement reports in encapsulated form, in the form of SMS messages, in order to prevent the interception of the measurement report by the serving base station. The service node is able to perform handover decision algorithms using the measurement reports collected from the mobile stations in order to determine appropriate radio access nodes to be allocated to the mobile stations.

System and method for gsm hard handoff

Abstract: A GSM1x (206)-to-GSM (208) handoff feature allows a GSM1x subscriber with a dual-mode (GSM1x and GSM modes) handset (204) to seamlessly roam from GSM1x coverage areas to GSM coverage areas This functionality is facilitated by the GSM1x system design which integrates a CDMA RAN with a standard GSM core network The GSM1x system is built using standard CDMA as its air interface and an unmodified CDMA RAN with a standard IOS interface to the MSN (304) The only modifications are done at the MSN (304) and the MS

Adaptive load balancing between multiple cell layers

Abstract: The target of this paper is to quantify some of the benefits of load information sharing for traffic management in an environment where several different radio access technologies coexist with cells on several hierarchical layers. The benefits of changing the load based handover thresholds depending on the load of the neighbouring inter-system/layer cells are investigated by dynamic simulations for real-time traffic. The results show that the number of unnecessary handover attempts and failures can be significantly reduced by tuning the load based handover thresholds, and the load threshold tuning period should be between 10-30 s in order to minimise unnecessary handover measurements and signalling.