摘要:
A method for synchronizing multiple database that are provided at different times is provided. As a wireless communication device (102) leaves a first region (104) and enters a second region (108), it is provided with a new preferred roaming list information (204) which may no longer be synchronized with a stored functionality extension table. Based upon information included in the new preferred roaming list information, an appropriate functionality extension table (214) that is synchronized to the new preferred roaming list is received.
摘要:
A wireless communications system in which an access point (AP) transmits a downlink signal for reception by one or more subscriber unit(s) (SU) and the subscriber unit (SU) transmits an uplink signal for reception by the access point (AP). The downlink signal from the access point (AP) carries syncronisation bursts (2) at predetermined times and data contained in frames interleaved between the synchronisation bursts. Each synchronisation burst comprises an offset pointer (4) to the start of the subsequent downlink frame.
摘要:
The invention discloses a selecting method of a synchronization code for a mobile communication synchronization system. The method selects a binary code with zero correlation window as the synchronization codes for a mobile communication synchronization system, i.e. selects a binary code whose periodic autocorrelation and periodic cross-correlation have a zero correlation window, or whose aperiodic autocorrelation and aperiodic cross-correlation have a zero correlation window; and for former transmitting the synchronization codes uses cyclic and continuous mode and for later a protection time slot is added to said synchronization codes for transmitting. A width of said zero correlation window is defined according to that the width is greater than time delay spread of a multipath signal. Using the method, the selected synchronization code can implement more accurate synchronization.
摘要:
The present invention provides a method for automated synchronization between a first and a second mobile terminal. A plurality of individual modes are provided to be operable with an operation mode of the first device. According to an embodiment of the invention, the individual modes corresponds to profile settings which are responsible for defining the operational state of for example a mobile phone at receiving a call or a message, i.e. to ring and to vibrate in case of receiving a call or to vibrate only. The user is allowed to extend the individual modes such that at asserting an extended individual mode a synchronization process to automatically activated. According to another embodiment of the invention, the synchronization process is performed directly between these two terminal devices in a device-to-device manner via a local communication connection.
摘要:
The invention concerns a timekeeper equipped with a radio reception device capable of decoding a Radio Data System (RDS) information (7) and comprising a time base (1), means (5) for displaying time data supplied by said time base, and means (2) for correcting said time data. The radio reception device (7) comprises means (10) for delivering RDS type data derived from a RDS spectrum received on a high-frequency carrier; and control means (4, 6, 19) which, on the basis of the delivered RDS type data control the correcting means (2) to ensure time setting of the timekeeper. The invention is characterised in that the timekeeper is designed to be portable and the radio reception device (7) further includes means (10) for rejecting the spectrum received from a frequency modulated transmitter supplying RDS data, except for the frequency band in which are contained RDS type data.
摘要:
A radio communication scheme applicable to UMTS providing packet data services, such as multimedia broadcast and multicast services (MBMS), to one or more users by modifying (augmenting) certain existing radio communication protocols while employing a new transport channel (a point-to-multipoint DSCH), and/or by establishing new physical downlink shared channels (C-PDSCH and D-PDSCH). An RLC layer is provided in a single CRNC so that the same MBMS can be transmitted to a plurality of terminals via a point-to-multipoint DSCH, without having to repetitively provide many RLC layers in many SRNCs. Alternatively, a C-PDSCH (physical downlink shared channel for control) and a D-PDSCH (physical downlink shared channel for data) are established to allow periodic transmission of MBMS, permitting users to simultaneously access one or more MBMS.
摘要:
In a method of communicating messages between a transmitter and receiver, wherein each message is sent in sequence and includes a sequence number. An expected sequence number, which is stored in the receiver, is incremented upon receipt of a message. The received sequence number in the message is decoded and compared to the incremented expected sequence number. If the numbers match the message is further decoded.
摘要:
The present invention provides a method for predicting channel power fading in a wireless communications system. This prediction method estimates the channel power fading via oversampling of the received and transmitted powers. The prediction method is then combined with several proposed structures for closed loop power control. The resulting structures result in improved performance in wireless communications systems.
摘要:
A radio communication system comprises a communication channel for the transmission of data packets from a primary station to a secondary station. In operation, on detection of a data packet the secondary station transmits (408) an acknowledgement signal to the primary station to indicate the status of the received data packet, and resets (406) a timer. While the timer is running, the secondary station modifies a characteristic of uplink transmissions. In one embodiment the modification comprises the secondary station transmitting (412) a negative acknowledgement for each time at which a data packet could have been transmitted if no indication of a data packet is received. In another embodiment the modification comprises the secondary station altering a parameter relating to transmission of channel quality information to the primary station.
摘要:
Time base error in a dual mode mobile telephone is correct by measuring the time of arrival of a signal (6) comparing the time of arrival with an expected time of arrival (2). The time base error is corrected with a measured error signal (10, 12). An average time base error is derived from the measured errors over a predetermined period of time (14). From this, predicted error is used to correct the expected time of arrival of a signal (4).