Lucent Technologies Inc.

Martine Madelaine Herpers

Norbert Alfred Bauer

Andrea Giustina

Adrian Robert Flewitt

Sudheer A Grandhi

Simon C Borst

Terry Si-Fong Cheng

Boris Dmitrievich Lubachevsky

Peter Christian Gunreben

Christopher Lawrence Fernandez

Michael Soellner

Prashant Janardhan Kurdukar

James E Hoch

Roland K Henter

Hans-Juergen Kettschau

Masoor Ramesh

James Edward Hoch

Prashant Janardham Kurdukar

In a General Packet Radio Service (GPRS) system in which a Serving GPRS Support Node operates a leaky bucket algorithm to control data flow, a packet control unit in the base station is arranged so that on connection of a new mobile, a flow control message in the form of new values of B the maximum bucket capacity and R the leak rate is sent to the Serving GPRS Support Node only when it is known that the new connection is non-bursty. In the Temporary Block Flow queue for the new connection, a threshold is set at a queue length which ensures that at least two Logical Link Layer-Protocol Data Units are received before the threshold is reached. New values of B and R are then sent, the new value of B being related to the maximum data capacity of the newly connected mobile.

Radio telecommunications system with improved use of air interface (II)

A packet control unit for a radio telecommunications system such as GPRS has a radio link control/medium access control blocks scheduler which allocates a number of temporary block flow queues to a timeslot for transmission to a mobile system; a fixed allocation table is provided having allocation slots corresponding to RAC blocks, and the RAC blocks scheduler reads the table cyclically and allocates slots according to the reading. Timeslots are requested later during increased demand conditions and are released earlier during decreasing demand conditions than in currently known arrangements.

Radio telecommunications system with improved use of timeslots

The interference on the available communication frequencies is measured during an idle time slot over a first period of time at a first rate. The available frequencies are prioritized based on the interference measurements, and a list is formed of the frequencies having the lowest interference measurements. Interference measurements are made at a second rate, greater than the first rate, for a second period of time less than the first period. When a call is assigned, the interference level requirements for the call are given, and the carrier power level of the call is measured. The carrier-to-interference ratio of each frequency in the list is determined using the second interference measurements and the measured carrier power. The frequencies in the list meeting the interference level requirements for the call are then selected, and frequency hopping while serving the call is performed using the selected frequencies.

Method for frequency hopping in a TDMA wireless communication system

In a radio telecommunications system such as GSM in which a serving node operates the leaky bucket algorithm to control flow of packet data to a packet control unit and a virtual queue of data is formed in the control unit, upper and lower triggers BVC(u), BVC(l) are provided on the queue, and when the queue reaches the upper trigger, the packet control unit sends a request to the node to alter the leak rate R of the leaky bucket algorithm so as to reduce the data flow rate. When the lower trigger BVC(l) is reached, the control unit sends values of R and of Bmax, the maximum bucket size of the leaky bucket algorithm, to the node so that the length of the virtual queue is maintained close to the value of Bmax. Bmax is proportional to the number of allocated timeslots.

Radio telecommunications system with improved use of air interface

A method for providing adaptive neighbor cell lists for a cellular radio network. In cellular radio networks, handovers are used to hand over a call from one cell to another. To identify possible cells for handovers, neighbor cell lists are used for each cell containing information on neighboring cells. Due to system limitations these neighbor cell lists sometimes do not contain all available neighboring cells. The present invention overcomes this disadvantage by providing a method that allows adapting the neighbor cell lists according to the actual location of a mobile station and the actual reception conditions at the time the mobile station is operative. The method provides a first part of the neighbor cell list containing information on fixed neighbor cells, and it provides a second part of the neighbor cell list containing information on varying neighbor cells.

Cellular radio network

A method and an apparatus for using fuzzy logic to determine when handovers are desirable and the extent to which the radio transmission power in a cellular telephone network should be adjusted. The mobile phone and the base transceiver station measure certain system parameters, including rate of handover, quality, distance, level, call duration, and power. These measurements are input to a fuzzifier. The fuzzifier applies standard fuzzy-set-theory membership functions to the measurements, and the fuzzifier outputs a set of fuzzy variables corresponding to the measurements. The fuzzifier outputs are input to an inference engine. The inference engine contains a set of rules that, when applied to the inference engine inputs, indicate: when a handover should be performed; when a handover should not be performed; and the amount by which, if any, the transmission power should be adjusted.

Handover control method and apparatus using fuzzy logic

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Herzogenaurach, Germany

Martine Madelaine Herpers