Abstract: The present invention relates to a method for scheduling transmissions in a radio communication system comprising a plurality of base stations and a plurality of terminals, a base station being associated to a sector and transmitting/receiving data to/from terminals located in said sector. According to the present invention, the method comprises the steps of: determining an area around each given sector, said area comprising a set of sectors, allocating to said sectors in said area a scheduling priority chosen among at least two different scheduling priorities, scheduling decisions in a sector having a lower scheduling priority than a sector belonging to said area depending on scheduling decisions made for said sector with higher scheduling priority, said scheduling decisions made in said sector with higher scheduling priority being reported by said base station associated to said sector with higher scheduling priority to said base station associated to said sector with lower scheduling priority.

Abstract: The present invention relates to measurement in radio communication systems. In particular, the present invention relates to a sounding method in a cellular wireless communication system, the communication system itself and its components like base stations and mobile stations. The radio communication system (1) comprises at least one mobile station (2) and at least two base stations (3, 4). One of said base stations is a serving base station (3) for the mobile station (2) and the at least one further base station is a neighboring base station (4) of the serving base station (3). The serving base station (3) is adapted to generate a schedule for measurement signals and to transmit said schedule to the mobile station (2) and to the neighboring base station (4). The mobile station (2) is adapted to transmit measurement signals in accordance with said schedule to the serving base station (3) and to the neighboring base station (4).

Abstract: The present invention relates to a method for reducing interference in the downlink direction of a cellular radio communication system comprising base stations communicating with terminals using a frame structure showing a time and frequency extension, said frame comprising a preamble portion and at least one data portion, said terminals being adapted to receive frames for which the receive power of said at least one data portion is varying in a predefined range relative to the receive preamble power of said preamble portion, According to the present invention, the method comprises the steps of: transmitting the part of said data portion destined to said terminal with a transmit power adapted to generate a first receive power (Plow) at said terminal within said range if said terminal belongs to a first group of terminals; transmitting the part of said data portion destined to said terminal with a transmit power adapted to generate a second receive power(Phigh) at said terminal within said range, said secon

Abstract: The present invention relates to a method for allocating frequency subchannels on an air interface of a wireless communication system to users for a predefined time period, a plurality of frequency subchannels being available for communicating between a base station belonging to a cell and users under the coverage of said cell requiring a frequency subchannel allocation. According to the present invention, the method comprises the steps of: determining an angular position of the users under the coverage of a cell relative to a base station in said cell; selecting at least one frequency subchannel to be assigned to a user depending on its angular position and the angular position of at least one other user.

Abstract: The present invention relates to an FDD Inband backhauling method for establishing a wireless transmission from at least one access base station to a master base station in a digital cellular communication system, the access base station coupled to at least a mobile station, the access base station coupled to a relay base station, the relay base station coupled to the master base station, the master base station coupled to a core network. The method comprises the steps of: receiving a first signal (s1) by the access base station from the mobile station using a first frequency band (f1); transforming the first frequency band (f1) of the first signal (s1) into the second frequency band (f2) by the access base station; and transmitting the first signal (s1) from the access base station to the relay base station using the second frequency band (f2).

Abstract: The invention relates to a multicarrier mobile device comprising a receiver (101) for receiving a first multicarrier signal being associated with a first communication cell and a second multicarrier signal being associated with a second communication cell, an extractor (103) for extracting a first signal portion from the first multicarrier signal and for extracting a second signal portion from the second multicarrier signal and a processor (105) for determining a first interference power on the first signal portion and the second interference power on the second signal portion.

Abstract: The present invention relates to a method for scheduling simultaneously terminals belonging to two radio communication systems in a common frequency band, a base station of said first communication system having knowledge of said second radio communication system, both systems using an OFDM resource allocation mechanism on the air interface, an OFDM frame structure being predefined for said first system. According to the present invention, the method comprises the steps of: detecting in said first system the amount of resources needed for said second system for a predefined time period; determining a first part of said OFDM frame reserved for said first system and a second part of said OFDM frame reserved for said second system for said predefined time period, said first and second part of said OFDM frame being separated in the frequency domain of and taking into account the resources needed for said second system.

Abstract: A method for detecting symbol timing in an OFDMA system is described, wherein a sub-channel comprises several groups (1) of sub carriers (2) spread over the frequency band, each group (1) of sub carriers (2) comprising at least one pilot carrier (4), said method comprising the steps of: correcting the received pilot sub carriers (4) with a set of different time shifts, calculating the standard deviation of the corrected pilot sub carriers (4) for each time shift, selecting the time shift showing the minimum standard deviation, and applying said time shift to received data sub carriers (5) on said sub-channel. Furthermore a OFDMA base station to be used to execute the method mentioned above, plus a computer program product causing a computer to perform said method is described.

Abstract: A method for extending the service coverage of a radio access system comprising a main base station (MBS) serving a plurality of subscriber units (SU1 to SU4) in a service coverage area (CA), in which at least one hybrid intermediate unit (HIU) acts as a wireless relay station for transmission of information between the main base station (MBS) and one or more subscriber units (SU3 and/or SU4) located outside the service coverage area (CA) of the main base station, and in which the hybrid intermediate unit (HIU) behaves both as a subscriber unit of the main base station (MBS) and as a base station serving the one or more subscriber units (SU3 and/or SU4) located outside the service coverage area (CA) of the main base station.

Abstract: A synchronization procedure for a multipoint-to-point CDMA network (2), which minimizes the influence on the information transmission. Instead of interleaving communications and synchronization signals timewise, a simultaneous emission is proposed, in which the synchronization signals are superimposed on the communications signals. The synchronization signals are coded with a special synchronization code (6), which does not correspond to the CDMA communications code of the information signals, e.g Barker code. In addition, the synchronization signals are sent at a lower amplitude compared with the communications signals. The synchronization signals are also modulated (7) prior to sending, in particular using alternating multiplication by +1 and ?1. On the receiving side (3), the synchronization signals are detected by demodulation (12; 15), correlation (13; 16) and subsequent accumulation.

Abstract: The invention relates to a method and a system for improving the quality of a radio signal, particularly for systems according to the IEEE 802.16 standard. In the case of a wireless transmission of radio signals the signals often doesn't reach the receiver in a direct way, but are scattered and reflected at various objects. This leads to the reception of multipath signals with different phases and amplitudes which interfere and decrease the signal quality. In addition, signals from external sources reach the receiver and interfere with the radio signal. It is suggested that the receiver analyses incoming signals and determines whether the additional signal is a multipath signal or stems from an external source. In the first case a constructive interference of the radio signal with the additional signal is arranged. In the second case the additional signal is subtracted from the radio signal.

Abstract: It is the object of the invention to make available a method of transferring user data packets from a terminal to a mainframe of an S-CDMA point-to-multipoint system, in which the data transfer is optimized. The method includes the steps of a repeated transmission of reference data packets coded with pilot codes for the duration of the connections between terminals and a mainframe, wherein the reference data packets contain previously known information, and the transmission of user data packets coded with communication codes include the user information to be transferred. In a preferred embodiment of the invention the user data packets are coded synchronously in time to the reference data packets, superimposed on these, and then modulated. Each terminal is allocated a pilot code, and at least one communication code.

Abstract: The invention relates to a cellular broadband wireless access network for a railway/train comprising a plurality of access points (AP1?, . . . , AP5?) along the railway defining respective cells (CO1, . . . , CO5) of the wireless communications network, where the access points (AP1?, . . . , AP5?) are connected to at least one network gateway (GW) via an aggregation network, and where an access point (AP1?, . . .

Abstract: A communication system comprising a base station and a central office, the base station is used to establish a point-to-multipoint communication to a number of terminal stations and is coupled to the central office. The point-to-multipoint communication provided by that base station is used as a communication link between the central office and the base station.

Abstract: A master clock signal generated at the center (1) of a bidirectional point-to-multipoint network is transmitted in the form of time stamps in an MPEG-2 data format over the downstream channel of the network to a plurality of transmitting/receiving facilities (3). Each transmitting/receiving facility (3) derives the clock signal for the upstream channel from the master clock signal and a local clock signal generated by a reference clock (12). The center (1) compares the clock signal from each transmitting/receiving facility with the master clock signal and derives from the result of this comparison digital phase correction information individual to each transmitting/receiving facility (3), which it transmits to the respective transmitting/receiving facility (3) in the MPEG-2 data stream. The respective transmitting/receiving facility (3) uses the phase correction information to control the clock signal for the upstream channel in a numerically controlled oscillator (13).

Abstract: The invention relates to a circuit arrangement for a receiver for receiving bursts of a non-continuous signal, with a device for tuning to the current parameters of the signal required for evaluating a burst, in which the device for tuning is controlled in such a way that the parameters achieved at the end of a burst are extrapolated to the start of the next burst and used to evaluate it and as the starting point for further tuning, and also a transceiver for subscriber-side connection to a local wireless access network for the worldwide telecommunications network, the receiving part of which contains a circuit arrangement of this kind.

Abstract: It is the object of the invention to make available a method of transferring user data packets from a terminal to a mainframe of an S-CDMA point-to-multipoint system, in which the data transfer is optimised. The method according to the invention is comprises the steps of a repeated transmission of reference data packets coded with pilot codes for the duration of the connections between terminals and mainframe, wherein the reference data packets contain previously known information, and the transmission of user data packets coded with communication codes comprising the user information to be transferred. In a preferred embodiment of the invention the user data packets are transmitted as coded synchronously in time to the reference data packets, superimposed on these and then modulated. Each terminal is allocated a pilot code, and at least one communication code.

Abstract: The object of the invention is to provide a cellular radio system, in particular a LMDS system wherein the utilization of the transmission capacity is optimized. The cellular radio system is characterized in particular in that each cell contains a base station, that at least one cell is divided into at least two sectors, that each sector comprises one non-overlapping zone and two overlapping zones, and that each base station is suitable to allocate at least one transmission unit (time slot or orthogonal code) simultaneously to at least two different terminals located in different, non-overlapping zones of a cell.

Abstract: The object of the invention is to provide a synchronization procedure for a multipoint-to-point CDMA network (2), which minimizes the influence on the information transmission. Instead of interleaving communications and synchronization signals timewise, a simultaneous emission is proposed, in which the synchronization signals are superimposed on the communications signals. The synchronization signals are coded with a special synchronization code (6), which does not correspond to the CDMA communications code of the information signals, e.g Barker code. In addition, the synchronization signals are sent at a lower amplitude compared with the communications signals. The synchronization signals are also modulated (7) prior to sending, in particular using alternating multiplication by +1 and −1. On the receiving side (3), the synchronization signals are detected by demodulation (12; 15), correlation (13; 16) and subsequent accumulation.