Showing papers on "Handover published in 1984"
TL;DR: It is shown that distance measurement is the most reliable means of detecting cell boundaries in public land mobile networks and new approaches for system control channels lead to synchronous operation of base stations.
Abstract: The paper presents a survey of a new approach to advanced system solutions for mobile radio telephone systems. It is shown that, by the combination of both radio techniques and microprocessor data capabilities, improved means are available for controlling the specific multiple propagation and interference influences within the mobile radio environment. The aim of the system structure is to achieve the best possible frequency channel utilization, system availability, and cost benefits for deployment and users if traffic demand grows. The paper shows the different types of switching functions in public land mobile networks. Problems, as caused purely by radio conditions, are controlled within a defined radio exchange function, allowing the optimization of individual cell parameters. It is shown that distance measurement is the most reliable means of detecting cell boundaries. New approaches for system control channels lead to synchronous operation of base stations. The system operates with off-air call setup and queueing to improve channel utilization. Full national and international roaming capabilities are provided. During all calls, continuous digital link control is maintained to allow the radio exchange function in call condition. This new approach leads to different types of handoff to suit specific situations. Speech scrambling provides subscriber privacy.
27 citations
Patent•
02 Aug 1984
TL;DR: In this article, a mobile machine 4' transmits a busy channel switch request signal via a common control channel via a base station 3 in the zone 6, and the information received by the station 3 is transferred to a control station 1, and a channel so far connected is detected at the station 1.
Abstract: PURPOSE:To restart a disconnected call by delivering a busy channel switch request from the shift side through a common control channel in case it is impossible to transmit the information on a new call channel through an oil call channel. CONSTITUTION:A call is disconnected owing to the suddent deterioration of level when a mobile machine 4 enters a zone 6 from a zone 5. In such a case, a mobile machine 4' transmits a busy channel switch request signal via a common control channel. This request signal is received by a base station 3 in the zone 6. The information received by the station 3 is transferred to a control station 1, and a channel so far connected is detected at the station 1. At the same time, a call channel toward the station 3 is set and a call channel sent from an existing exchange network is switched to the call channel set toward the station 3. Then the information on a new call channel is transmitted to the machine 4' through a common channel and via the station 3.
2 citations