摘要:
A problem with tape units (TU) arises when writing of data onto a tape is not successful. The computer does not know which blocks (1-25) have been stored successfully. Data blocks are buffered in a ring buffer for so long that one can be sure that the storing on the tape (TA) is successful. The ring buffer can be implemented as buffer areas (BA1, BA2) in disk units (W1, W2). Data blocks are stored not only in the tape unit but also in the first buffer (BA1), until it is filled. Then blocks are stored in the second buffer (BA2), until this too is filled, and the first buffer (BA1) is used again. When there is a problem with the tape unit, the tape unit is re-initialized, whereby the data in the tape memory (TM) is lost. Loss of data is prevented by reading the data from the ring buffer.
摘要:
The invention pertains to a method for realising a group call in a digital radio network wherein a plurality of mobile subscribers (11) participating in the group call roam within the area of at least one base station (10). According to the method, subscribers (11) participating in the group call are guided one by one to talk on the same radio channel (12). To be able to handle the traffic in a controlled manner at all times without the subscribers congesting the radio channel by talking simultaneously, the base station (10) is informed of the subscriber's desire to speak after said subscriber has indicated his desire to speak with predetermined signalling, the next speaker is selected at the base station (10) on the basis of a predetermined algorithm, and the base station (10) transmits an indication of a turn to speak to the subscriber (10) which at the time is the next speaker.
摘要:
The invention relates to an adapter equipment (IWF), a method and an arrangement for setting up a data call terminating at a subscriber in a telecommunication network. In the invention, adaptation functions of two or more data services are integrated into a single adapter pool (41) that has one common MSISDN number shared by all the data services. After the connection has been set up, the IWF does not try to synchronize itself according to any data service towards another network but it monitors a traffic channel arriving from the other network (ISDN, PSTN) in order to identify the data service used by the calling terminal equipment. After the IWF has identified the data service, it starts operating in the manner required by the identified data service and data transmission may begin.
摘要:
The invention relates to a visitor location register and a method for handling an outgoing and an incoming call in a mobile communications system employing a multinumbering scheme. Signalling originating from a mobile services switching centre (MSC) contains in case of a mobile-originating call the directory number of the calling subscriber and in call forwarding, the redirecting number. This directory number is obtained from the visitor location register (VLR). In accordance with the invention, all the directory numbers for different basic services of the mobile subscriber are transferred from the home location register (HLR) to the VLR. The VLR is thus capable of providing the MSC with the correct one of multiple directory numbers according to the basic service related to the call.
摘要:
The invention relates to a method and a device for controlling the power of a control channel (BCCH) in a radiotelephone system, such as the GSM mobile radio network. In the method, the power of the control channel (BCCH) is kept constant during normal operation. To enable easy control of the constant power of the control channel, power data is transmitted on the control channel (BCCH) at least in the first time slot of the frame and the power of the control channel is locked throughout each frame to a level determined in said first time slot.
摘要:
The invention relates to a method for location updating in a cellular radio network. The network stores subscriber data permanently in a home location register (HLR) and temporarily in visitor location registers (VLR) integrated with mobile services switching centers (MSC). In connection with a call setup, the HLR requests the VLR to provide routing information for the subscriber, whereafter the inbound call is routed to the pertinent MSC and the subscriber is paged by the radio path. In the invention, the network updates the location of the subscriber by check paging performed as a background run at suitable times.
摘要:
The present invention relates to an actuator for linear movement comprising a motor (5) provided with a rotatable motor axle (4), a movement axle (6), a thread transmission (7, 8) between the motor axle and the movement axle, a supporting frame (9), a controlling support (10, 11) between the supporting frame (9) and the movement axle (6) for changing the rotating movment of the motor axle into a linear movement of the movement axle, and further, a clearance removing means (12) for removing clearance in the axial direction. The thread transmission (7, 8) between the motor axle (4) and the movement axle (6) comprises an internal thread (7) in the motor axle (4) and an external thread (8) in the movement axle (6). In accordance with the invention, the actuator for linear movement comprises a means (12 or 30) for removing vertical, horizontal and rotary clearances.
摘要:
The invention relates to a method for setting up a telephone connection in a telephone system which system comprises several exchange systems (100 and 116). The invention also relates to an exchange system (100) operating in accordance with the method. A queuing list is used in the method, which list is maintained in such a manner that when no free connection is available, the operator (107) places information about the received call order in the queuing list to wait for a connection to become free. In the method, the loading of connections (108a to 108c, 114 and 115) is monitored, and when the required connection (108a to 108c, 114 and 115) is detected to be free, the connection (108a to 108c, 114 and 115) is reserved for the use of the operator (107) and the operator (107) is sent information about the call order on the queuing list. After this, the operator (107) can put the call through. The method makes the search for free connection automatic in congested directions and therefore the work of operators (107) will be easier.
摘要:
Many digital processors have an asynchronous bus controlled by two control signals (ENA', RWN). To interface a synchronous memory to an asynchronous bus, interface logic is required. In the interface (3) for transferring data (DATA) from an asynchronous circuit (1) to a synchronous circuit (2), data to be written are written in an intermediate register (DR) while the timing control signals (ENA', RWN) are being synchronized to the system clock (CKO) by means of flip-flops. Correspondingly, in the interface (4) for transferring data (DATA) from the synchronous circuit (2) to the asynchronous circuit (1), the signal (RWN) indicating a read transaction from the synchronous circuit is synchronized to the system clock by means of a flip-flop circuit.
摘要:
The invention relates to a disable tone detection method in an echo canceller. The disable tone signal is within a predetermined tolerance range from a nominal frequency and includes phase inversions occurring at predetermined intervals. The method according to the invention comprises steps of a) removing frequencies outside said tolerance range from an input signal (Sin, Rin) by band-pass filtering (33), b) sampling (34) in the filtered signal at a sampling frequency, said sampling frequency being about half of said nominal frequency, so as to aliase the sample signal to the vicinity of the zero frequency, c) creating a substantially in-phase version for said aliased sample signal component, d) delaying said in-phase version by about 2n sample signal periods, where n is a positive integer, e) detecting (34) a phase inversion in the disable tone signal by means of an XOR operation executed on the aliased sample signal component and the delayed version thereof.