Showing papers by "Matthias Lott published in 2006"

Fast synchronised transparent handover method and system

Abstract: A mobile communications system (100), comprising at least one mobile terminal (200), a plurality of base stations (300a - 300e), at least one central entity (400) adapted to manage said plurality of base stations, adapted to perform a handover, wherein: - said mobile terminal (200) is adapted to transmit a handover request message in a pre-defined slot requesting a new point of attachment; - said plurality of base stations (300a - 300e) are adapted to receive said handover request message and further adapted to determine which one of said plurality of base stations (300a - 300e) is to become said new point of attachment; - a base station (300a) arranged to become said new point of attachment is further adapted to transmit a handover response message to said mobile terminal (200); - said mobile terminal (200) is adapted to receive said handover response message and to change its point of attachment.

Fast synchronised handover method and system

Abstract: A mobile communications system (100), comprising at least one mobile terminal (200), a plurality of base stations (300a - 300e), at least one central entity (400) adapted to manage said plurality of base stations, adapted to perform a handover, wherein: - said mobile terminal (200) is adapted to transmit a handover request message in a pre-defined slot requesting a new point of attachment; - said plurality of base stations (300a - 300e) are adapted to receive said handover request message and further adapted to determine which one of said plurality of base stations (300a - 300e) is to become said new point of attachment; - a base station (300a) arranged to become said new point of attachment is further adapted to transmit a handover response message to said mobile terminal (200); - said mobile terminal (200) is adapted to receive said handover response message and to change its point of attachment.

Adaptive Random Access with Beam-forming in 4G Mobile Networks

Abstract: Packet switching replaces the traditional circuit switching and with the wireless extension of the Internet next-generation air-interfaces have to cope with bursty IP traffic. Transmit resources on the air-interface have to be allocated on demand and in a very flexible manner. At the same time, the delay requirements are more stringent putting high challenges on the random access component of future wireless systems. In this paper a novel random access scheme exploiting the advantages of multiple-input multiple-output (MIMO) systems is presented that considerably enhances the spectral efficiency. Besides a heuristic algorithm for beam-forming the advantages are described and the performance gains are derived. Since MIMO will be part of 4G mobile networks and random access is a basic component in every wireless system the new approach is a promising candidate for systems beyond 3G.

Cellular radio communication system e.g. universal mobile telecommunication system third generation radio system, operating method, involves storing and calling probability parameters about successful transmission of connection at point

Abstract: The method involves measuring, commonly storing and/or calling radio parameter for connection of a mobile radio station (MT), a base station, access points and communication points (mMHNs), and location co-ordinates of the mobile radio station by the mobile radio station found in a radio communication system. The mobile radio station maintains a connection to the base station. Additional probability parameters about possible and successful transmission of connection are stored and/or called at the communication point. An independent claim is also included for a radio communication system with several access points.

Signalling overhead for ASBA in an MC‐CDMA system

Abstract: OFDM modulation combined with the hybrid multiple access scheme, CDMA/FDMA, has been shown to provide high flexibility and granularity for the synchronised downlink transmission. Moreover, an efficient resource allocation scheme, referred to as adaptive sub-band allocation (ASBA), can be used to assign sub-carriers to the users in such a way to maximise the overall system capacity based on the channel knowledge. In a time-variant channel the channel knowledge should be updated, and an estimate of the channel is supposed to be obtained by measuring the pilots periodically inserted in uplink (UL), under the assumption of time division duplex (TDD) operation mode. In this paper, a semi-analytical method is presented to find the proper updating period, with which the system throughput is maximised, under arbitrary mobility. It is shown that when a proper updating period is selected a considerable adaptation gain can be achieved even at a velocity of 200 km/h. Copyright © 2006 AEIT