31results about How to "Guaranteed seamless switching" patented technology

The invention discloses a random access method, base stations, user equipment and a system. The method comprises the following steps: a target base station receives a switching request message sent by a source base station; the target base station determines the random access component carrier (RCC) of the UE (User Equipment) on the target base station and sends a switching request response message to the source base station, and the switching request response message comprises the RCC information and random access resource information on the RCC; the source base station receives the switching request response message and sends a switching command; and after receiving the switching command, the UE keeps communicating with the source base station and initiates a random access process at the RCC. Through the invention, the seamless switching of the UE from the source base station to the target base station is ensured, and business interruption is reduced.

The invention relates to the automatic driving field and discloses a test method for an automatic driving simulation system. The test method comprises the following steps: a vehicle simulation environment is generated; through a data conversion interface, sensor data in the simulation environment is read and the data is converted into the sensor data which can be identified by a second automatic driving simulation system; the second automatic driving simulation system receives the identifiable sensor data and generates a second control instruction according to the sensor data and a preset testobject and sends the second control instruction to the data conversion interface; the data conversion interface receives the second control instruction and converts the second control instruction into a control instruction which can be identified by a simulation environment generation module; and the simulation environment generation module applies the identifiable control instruction to a virtual vehicle to enable the virtual vehicle to operate in a virtual scene, thereby realizing test of the second automatic driving simulation system.

The invention discloses a switching-over method, a device and a system of a multicast distribution tree, which are applied to a multicast virtual private network VIP system which comprises a source-end edge router and a downstream edge router; the method comprises the following steps: when meeting a switching-over condition of the multicast distribution tree, the source-end edge router obtains switching-over group address from a switching-over address pool; switching-over information corresponding to at least two multicast streams is packed into multicast domain information by the source-end edge router according to the switching-over group address, and the multicast domain information is transmitted to the downstream edge router along the shared multicast distribution tree; the source-endedge router leads the multicast streams to be switched-over to the multicast distribution tree from the shared multicast distribution tree after the source-end edge router receives access messages from the downstream edge router. The invention realizes accurate communication of switching-over information and ensures seamless switching of the VIP multicast streams from Share-MDT to Switch-MDT.

The invention discloses an authentication switching method with privacy protection in an LTE (long term evolution)/LTE-A (LTE-advanced) network. After ME (mobile equipment) is accessed to the LTE/LTE-A network for the first time and successfully finishes access authentication with an AAA (authentication, authorizing and accounting) server, the AAA server generates a pseudonym set for the ME. When the ME needs to be switched to a new AP (access point) due to movement, only one unused pseudonym needs to be selected from the pseudonym set to perform identity authentication, the real identity of the ME does not need to be provided, so that leakage of a user identity and position privacy can be avoided, and anonymity and untraceability are realized. In the authentication switching process, key agreement is realized based on a Diffie-Hellman key exchange algorithm, the mutual authentication process is finished by hash function value verification, bilinear pairing operation is omitted, and authentication delay is reduced.

The invention discloses a downlink channel service processing method in MAC layer, comprising: UTRAN-side MAC layer processes the received service data from special logic channel and sends the processed service data to downlink shared channel; correspondingly, UE-side MAC layer processes service data comining from the downlink shared channel and sends the processed service data to a corresponding special logic channel. And the invention also discloses an uplink channel service processing in MAC layer, comprising: UE-side MAC layer processes the received service data mapped into special logic channel of nonrandom access channel and sends the processed service data to uplink shared channel; correspondingly, UTRAN-side MAC layer processes service data coming from the uplink shared channel and sends the processed data to the special logic channel.

The invention provides a BuckBoost circuit and a control method thereof. The method comprises the steps that under the fixed-frequency width-modulation mode of the BuckBoost circuit, a controller calculates the modulation ratio M in real time according to an output voltage given value and an output voltage sampling value; the controller controls a Buck switching tube bypass relay and a Boost diodebypass relay according to the modulation ratio M respectively; the controller conducts bypass control on a Buck switching tube and a Boost diode through the bypass relays respectively, and a BuckBoost circuit working mode is controlled. The circuit comprises the Buck switching tube bypass relay which is used for conducting bypass on the Buck switching tube, the Boost diode bypass relay which is used for conducting bypass on the Boost diode, a flying-across relay which is arranged between the Buck switching tube and the Boost diode, and the controller. According to the BuckBoost circuit and the control method thereof, the circuit efficiency can be effectively improved, the cost is low, the circuit loss is reduced, the topological function of the circuit is not influenced, the circuit is safe and reliable in running, and the system performance and efficiency are optimized. Zone bits are controlled, so that the system is safe and reliable in running under topology.

The invention relates to a user level energy efficiency CoMP switching method based on an LTE-A system. The concept of user level is imported, an optimal cooperation set is selected for to-be-switchedusers of different levels to perform seamless switching. Compared with the traditional CoMP scheme, the scheme has the advantages that the personalized service requirements of the users of differentlevels can be met, because the users of high levels have high QoS requirements and are sensitive to delay in a communication process, so it is considered to preferentially select cooperation resourcesfor the users of high levels in a switching area when the resources are limited, thereby ensuring the communication quality of users of high levels and improving the switching success rate; and the users continuously measure the locations and the signal strength of mobile users in the movement process, and cooperation clusters are dynamically selected with the users as the center to meet the communication needs of the users. Switching users dynamically adjust the cooperation clusters of the high-level switching users in the movement process to meet the communication needs and to improve the switching efficiency; and in addition, from the perspective of energy efficiency, the cooperation cluster with the minimum power consumption is selected to improve the system energy efficiency while meeting the communication needs of the users.

The invention discloses a live broadcast method and device, electronic equipment and a computer readable storage medium. The method comprises the following steps: displaying a live broadcast picture of live broadcast on a display page; displaying a progress bar of the live broadcast on the display page, and a point on the progress bar is a playback starting point for playback of the live broadcast; receiving a first operation on the progress bar; and in response to the first operation, determining a target playback starting point corresponding to the first operation, obtaining target playback data corresponding to the target playback starting point through a live broadcast channel of live broadcast, and displaying the target playback data on the display page. According to the method and the device, the technical problem that when a live broadcast playback function is started in a live broadcast process in the related technology, playback can be performed only by re-establishing connection with the system is solved.

The invention is applicable to the technical field of power supplies, and provides a UPS control method, which comprises the following steps: acquiring the working state of a bypass; when the workingstate of the bypass is normal, collecting the instantaneous value of the input voltage of the bypass in real time, and determining a first zero crossing point and a second zero crossing point according to the instantaneous value of the input voltage of the bypass; at a first zero-crossing point moment, switching a direct-current conversion module into a positive half-cycle energy supply state, andswitching an inversion module into a positive half-cycle energy supply state; and and at a second zero-crossing point moment, switching the direct-current conversion module into a negative half-cycleenergy supply state, and switching the inversion module into a negative half-cycle energy supply state. According to the invention, when the bypass is normal, the zero crossing point is pre-judged according to the bypass input voltage, and the direct-current conversion module and the inversion module are switched to the positive half-cycle energy supply state or the negative half-cycle energy supply state at the same time at the two zero crossing points of one period, so that the output phases of the UPS are consistent when the bypass and the main loop supply power, and seamless switching between the bypass mode and the inversion mode is ensured.

The invention discloses a grading frequency conversion type multipath series resonance inverter power supply. The grading frequency conversion type multipath series resonance inverter power supply comprises a rectification transformer, a three-phase full bridge phase control rectifier, an LC filter, an H-bridge inverter, a matching transformer, a load coil and n parallelly-conected grading frequency conversion units, wherein each grading frequency conversion unit comprises a charge bleeder, a resonant capacitor and a switching switch, the charge bleeder is in parallel connection with the resonant capacitor, one end of the charge bleeder is connected with the matching transformer, and the other end is connected with the load coil. The inverter power supply is advantaged in that through switching different grading frequency conversion units and matching the corresponding H-bridge inverter driving frequency, grading frequency conversion operation of the power supply is realized; residual charges in the resonant capacitor can be released in the quite short time, DC bias borne by the switching switch is timely eliminated, and over-voltage burning of the switching switch can be prevented; the switching switch is controlled through employing a synchronization triggering strategy and a synchronization switching strategy, the control strategies are simple, seamless switching of output current frequency of the power supply is guaranteed, and current harmonic distortion is small.

The invention provides a method and a system for switching a called voice service. The method comprises the following steps: before switching from a network in which fixed-mobile convergence (FMC) terminal equipment exists, judging whether a call divert condition is met or not; and when the call divert condition is met, diverting the called voice service from the network in which the FMC terminalequipment exists onto a target network to be switched. After network switching is carried out, because the FMC terminal equipment carries out a call divert operation on the voice called service in a network to be activated, by adopting the called voice service switching method of the FMC terminal equipment, which is provided by the embodiment of the invention the seamless switching of the called voice service is guaranteed and the user's feel is improved. Moreover, when the network is switched, relevant hardware sources of an original network can be normally removed for other uses, for example, the removal of a data card or a network wire cannot influence the called service in the original network.