Abstract:
A method and circuitry for implementing digital multi-channel demodulation circuits (figs 2 and 6). More particularly, embodiments of the present invention provide a digital multi-channel demodulator circuit (250, 650). The demodulator includes a frequency-block down-converter (210, 610) that receives a multi-channel analog RF signal and shifts the multi-channel analog RF signal to a lower frequency band. An ADC (220, 620) receives the multi-channel analog RF signal from the frequency-block down-converter and converts the multi-channel analog RF signal to a multi-channel digital RF signal. A digital channel demultiplexer (230, 630) receives the multi-channel digital RF signal from the ADC and demultiplexes the multi-channel digital RF signal into separate digital RF channels.
Abstract:
Es wird ein Verfahren und eine Anordnung zur Übermittlung von Datenpaketen, welche neben der Nutzinformation (PL) eine Information über ihre zeitliche Reihenfolge umfassen, aus einem ersten Datennetz in ein zweites Datennetz angegeben. Das Auslesen der zwischengespeicherten Daten wird dabei an einer vorgebbaren, von der durch die Speicherung von Datenpaketen resultierende Speichersegmentierung unabhängigen Stelle der Speichereinrichtung gestartet. Die Erfindung eignet sich von RTP-Datenpaketen.
Abstract:
An SGSN handover procedure, for use in a GPRS network, reduces the need for resequencing inthe SGSN. This is achieved in that the old SGSN sends a message to the GGSN, requesting that it stop transmission of data. Ar that time, the ols SGSN transfers to the new SGSN and data which it needs to transmit to the mobile station. The GGSN resumes transmission of data, this time to the new SGSN, when the handover is complete. This requirement for the new SGSN to resequence the received data. The signal from the old SGSN to the GGSN, requesting it to stop transmission ,can be initiated when the old SGSN receives a message for the new SGSN, informing it that the mobile station has moved to a cell served by the new SGSN. Alternatively, the signal canb e sent fromt eh old SGSN to the GGSN, on receipt by teh old SGSN of a message fro the serving base station, informing it that the mobile station has changed to a cell served by another SGSN.
Abstract:
The present invention relates to retransmissions in a communications system, and more especially it relates to a cellular mobile radio system, particularly to a Universal Mobile Telecommunications System, UMTS. RLC configurations are adapted to radio conditions and UE locations.
Abstract:
A method and a telecommunication system for data packet numbering in packet-switched data transmission in connection with a handover, in which the responsibility for a connection is transferred from the connection between a mobile station and a first wireless telecommunication network to the connection between said mobile station and a second wireless telecommunication network. In the first wireless telecommunication network a data packet number space available for data packet numbering is bigger than a data packet number space of the second wireless telecommunication network. Data packet numbering is restricted in the first wireless telecommunication network such that the numbers of the data packets of the first wireless telecommunication network do not exceed the maximum value of the data packet number space of the second wireless telecommunication network.
Abstract:
In an indirect data transmission system a store and forward apparatus to receive data from a mobile station (3) which stores and forwards data received via a mobile telephone network (4) from a mobile station (1). When all the data in a message has been received by the store and forward apparatus (3), it forwards the message to its ultimate destination by a non-mobile network (5). The mobile station (1) can reconnect to the store and forward apparatus (3), if the connection is lost during transmission of a message.
Abstract:
A system and method of providing mobility between Internet Protocol (IP) based packet networks is disclosed. The disclosed system and method permits user equipment to roam from one IP based packet network to a second IP based packet network, without any interruption in data communications. Wide area network mobility is achieved through the modification of existing protocols to include additional network gateway addressing information.
Abstract:
The present invention relates to a data unit sending means and a method for controlling a data unit sending means, where data units of a first protocol (L2_ARQ) embed data units of a second protocol (L3) belonging to a higher layer, and said data units of said first protocol (L2_ARQ) are held in a send buffer means. According to the invention, the data units of the second protocol (L3) are discriminated, and the data units of the first protocol (L2_ARQ) that embed a particular data unit of the second protocol (L3) are associated with said particular data unit of the second protocol (L3), and the contents of the send buffer means is managed in accordance with said association.
Abstract:
The invention concerns a data communication system on public mobile radio networks, for example GSM and DCS, which implements a data service for business users incorporating a personal computer connected to a mobile radio terminal. The system guarantees continuity of service, consisting in permanently maintaining the sessions set up on network architectures, in the event of cell change, deactivation of the portable PC or of the mobile radio terminal, switching from one session to another, as well as in the event of a return to one session after the same session has been switched to radio telephone system. In a first embodiment the system uses on the mobile radio network packet transmission technique called transmission trunking both on the data network and on the mobile radio network. In another embodiment the system uses on the mobile radio network standard packet transmission technique, implemented on the radio network controller by an appropriate communication software.
Abstract:
A method of and apparatus for scheduling data transmissions in a communication network comprising at least one cell (2a to 2g) and at least one scheduled user (6a to 6e) improves utilization of the reverse link and decreases the transmission delay in data communication. The apparatus comprises a controller (92) for collecting status information for said communication network and for scheduling data transmissions from said at least one cell (2a to 2g) to said at least one scheduled user (6a to 6e). A memory (94) is connected to said controller for storing said status information, and a timer (96) is connected to provide timing signals to said controller (92). The timing signals enable said controller to perform scheduling of data transmission. Each remote station is assigned a maximum unscheduled transmission rate for the duration of the communication with a cell. A maximum scheduled transmission rate can be assigned by a channel scheduler (12) for scheduled transmission of data traffic at high rates. The maximum scheduled transmission rate is assigned in accordance with a set of system goals, a list of system constraints, and collected information on the status of the communication network. Data is partitioned in data frames and transmitted over the reverse link at or below the maximum scheduled transmission rate which have been assigned to the scheduled user.