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 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.

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.