31 results about "Cdma wireless networks" patented technology

Systems and methods are provided for wireless network selection by multi-mode devices. A mobile device maintains an indication of any wireless network services currently provided to the mobile device. According to an embodiment of the application, the mobile device automatically scans for both GSM wireless networks and CDMA wireless networks in order to acquire a wireless network that can provide a service that is not currently provided to the mobile device. Therefore, the mobile device avoids partial service or limited service when better service is available.

There is disclosed, for use in a CDMA wireless network, a channel resource allocator for reallocating a data traffic channel in a soft handoff state to handle incoming calls from new mobile stations. The channel resource allocator includes an overhead channel controller for reconfiguring a data traffic channel as an overhead channel upon failure of an overhead channel element in a base transceiver station (BTS). The channel resource allocator determines if all data traffic channels of the BTS are in use. If so, the channel resource allocator determines whether any of the existing calls being serviced by the data traffic channels are in a soft handoff state in which the call is connected simultaneously to, two or more base transceiver stations. If so, the channel resource allocator drops the connection to the BTS in which the overhead channel failure occurred, thereby freeing up the data traffic channel. The overhead channel controller may then reconfigure the dropped data. traffic channel as an overhead channel, or the channel resource allocator may reallocate the dropped data traffic channel to handle a new incoming call from a mobile station.

A Base Station Controller (BSC) that reduces the occurrence of audible noise in a Code Division Multiple Access (CDMA) radio network is provided. The BSC according to one embodiment of the present invention comprises a Media Stream Board (MSB) for compressing groups of 160 PCM speech samples from a Public Switch Telephone Network (PSTN) into vocoded frames, and a Special Purpose Board (SPB) for reformatting the vocoded frames from the MSB into over-the-air CDMA vocoded frames. The MSB and SPB each have a local timer that is slave to 'PSTN time'. The BSC further comprises a Timing Unit Board (TUB) connected to a GPS receiver. The TUB receives 'GPS time' from the GPS receiver. The TUB generates timing cells, each containing time-of-day information according 'GPS time'. The TUB distributes the timing cells to the MSB and SPB over an Asynchronous Transfer Mode (ATM) network. The MSB and SPB use the received timing cells to compare their local timer, which tracks 'PSTN time', to 'GPS time'. The MSB and the SPB realign their local timer with 'GPS time' whenever their local timer drifts from 'GPS time' outside of a predetermined time window.

Systems and methods are provided for wireless network selection by multi-mode devices. A mobile device maintains an indication of any wireless network services currently provided to the mobile device. According to an embodiment of the application, the mobile device automatically scans for both GSM wireless networks and CDMA wireless networks in order to acquire a wireless network that can provide a service that is not currently provided to the mobile device. Therefore, the mobile device avoids partial service or limited service when better service is available.

This invention discloses a safety transmitting device and a method for mobile communication devices. Said device can be connected on radio mobile communication devices of GSM or CDMA network detachably via their interface units including seven parts: a master control unit, a CODEC unit, a data compression code / decode unit, an asymmetrical ciphering unit, a symmetrical ciphering unit, a power supply unit and an interface unit. Said device utilizes the current GSM or CDMA network to carry out identity certification and session cryptographic key transfered by the improved PK1 asymmetric ciphered code system without CA and ciphers the data by session cryptographic key to be transmitted by the circuit exchange data service supported by network and carries out inverse process at the receive end to realize end-to end cipher communication function.

The invention relates to a vehicle mounted dangerous articles control sensor network system, including: a dangerous articles detection sensor, installed around dangerous articles; a video acquisition device, installed above the dangerous articles, for acquiring and outputting video signals; a display screen, connected with the video acquisition device, for receiving video signals output from the video acquisition device; a wire transmission module, connected with the video acquisition device and the display screen, for transmitting the video signals from the video acquisition device onto the display screen; a signal processing module, for receiving analog induction signals and outputting digital sensing signals; a wireless transmission module, connected with the signal processing module, for transmitting outside in a wireless mode; a central control module, for receiving the digital sensing signals and determining to output control signals when the digital sensing signals represent the occurrence of dangerous articles and heterogeneous; a short message alarm module, connected to the central control module, transmitting alarming short messages to mobile phone of appointed users in a short message mode; a audible alarm module, connected to the central control module, for receiving the control signals transmitted from the central control module through a CDMA wireless network; a GPS locating module, installed on vehicles transporting dangerous articles, for reporting the accuracy position of vehicles toward control center in real time. The invention also provides a monitoringmethod, which effectively reduces work intensity of staff, improves reliability of vehicle mounted dangerous articles carriage, and can reduce false dismissal rate and false alarm rate.

A handoff mechanism for a mobile station and wireless network preferably operating in a Z×EV-DV mode, using scalable traffic channels where Z is a multiple of a 1×EV-DV channel, including a distance-based handoff. The disclosed handoff mechanism can be used in conventional wireless telecommunications systems.

The present invention relates to a method and system for detecting a CDMA network copy card. The method includes: when a user accesses a CDMA wireless network through a terminal device, the PDSN acquires the corresponding MEID from the terminal device; when the PDSN initiates an authentication request to the authentication device, the The MEID of the terminal device is sent to the authentication device; the authentication device judges whether the user has established a PPP connection. If the user has established a PPP connection, it compares whether the MEID corresponding to the established PPP connection is the same as the MEID of the terminal device. If not, then Make sure that the corresponding UIM card of the user has been copied. In the present invention, the PDSN submits the MEID obtained from the terminal device to the authentication device, and judges whether the new PPP connection uses a user terminal or a new If the user terminal is a new user terminal, it can be judged that it has used a duplicate card, thereby solving the problem of misjudgment caused by abnormal inter-PDSN handover at the PDSN boundary.

Disclosed are a voice service realizing method, voice fallback realizing terminal and system, the method comprising: the terminal transmits a voice service request to a core network via an LTE wireless network; the terminal falls back the voice service from the LTE wireless network to a CDMA wireless network in a preset control manner; and the terminal executes the voice service with the core network via the CDMA wireless network. In the situation of networking an LTE wireless network and a CDMA wireless network, the terminal is difficult to realize voice service fallback. The present invention solves the problem, and reduces time delay and complexity for the terminal to realize voice service in the networking situation.

The invention provides a monitoring system for monitoring a fluid transmission pipeline by using an existing wireless network, which essentially consists of five parts of a flux collecting unit (FCU), a data transmitting and receiving unit (DTRU), an operation maintenance center (OMC), a power supply module (PSM), and a GSM or CDMA wireless network. The FCU is installed on the surfaces of variousliquid transmission pipelines and essentially aims at collecting the flux of the liquid flowing inside a petroleum transmission pipeline accurately and sending the flux value collected to the GSM or CDMA wireless network through wireless radio-frequency signals after the flux value is modulated and packed. The key function of the PSM is to supply power for the FCU. The DTRU transmits the flux data collected to the existing GSM or CDMA wireless network, and simultaneously receives the monitoring data and orders transmitted from the GSM or CDMA wireless network to form a transmission route between the FCU and the OMC through the GSM or CDMA wireless network. The key function of the OMC is to monitor and manage the transmission situation inside the whole liquid transmission pipeline. The OMCcarries out centralized and uniform treatment mainly according to the data information collected by the FCU to monitor the working situations and flux of all the pipelines, carries out statistic and calculation for the data, gives corresponding visual warning and video alarm when leakage occurs to the pipelines and notifies corresponding responsible persons the corresponding positions and situations of the pipeline for carrying out treatment through the GSM or CDMA wireless network by short messages.