132results about How to "Avoid switching failures" patented technology

The embodiment of the invention discloses a selection method for switching candidate target cells, which comprises the following steps: a base station receives a measuring report message transmitted by a terminal and carrying a sign of entering a cell edge, and saves the corresponding relation between an adjacent cell identification carried in the measuring report message and the signal intensity value; and after the base station determines to carry out cell switching on the terminal, according to the corresponding relation, the adjacent cell identification corresponding to the signal intensity meeting a preset switching threshold is determined, and the adjacent cell corresponding to the adjacent cell identification is selected as a candidate target cell for switching the terminal. The embodiment of the invention also discloses a selection system and device for switching the candidate target cells. The invention can improve the possibility of selecting the best candidate target cell when the terminal carries out cell switching and reduce the probability of switching failure.

The invention discloses a method for realizing switching between networks, which comprises the following steps: a control network element of a target network allocates wireless resource for a mobile station MS in the target network according to a switching request from a control network element of a source network, and then notifies the MS with the allocated wireless resource; the MS determines to send out uplink data on the target network according to the wireless resource notified by the control network element of the target network; after the control network element of the target network determines to successfully notify the MS with the allocated wireless resource, the message that the switching is finished is sent to the network element of the source network. In addition, the invention also discloses a system and a device for realizing switching between the networks. The method, the system and the device provided by the invention can avoid switching failure caused by rapid worsening of wireless environment of a source cell and improve the service quality since the MS need not wait for receiving a switching command sent by the control network element of the source network inside the source network.

Disclosed is a method for reducing resource allocations for inter-technology handover between heterogeneous wireless communication networks. The method includes a first step of completing network entry and new session registration procedures for a mobile station with a handover target technology network. A next step includes defining an activity mode of the new session. A next step includes waiting for the expiration of a resource timer at the target network. A next step includes assigning the resources for the new session upon the expiration of the timer.

The invention provides a measurement capability reporting method performed at UE (User Equipment). The method comprises the steps of generating and reporting UE measurement capability information based on a UE radio frequency link grouping relationship to a base station, as a reference for the base station to configure measurement gap configuration information for the UE; receiving the measurementgap configuration information for the UE from the base station, and receiving band or carrier aggregation (CA) band combination configuration information for the UE from the base station; and determining band or CA band combination configured for the UE by the base station according to the received band or carrier aggregation (CA) band combination configuration information for the UE, and for theband or CA band combination configured for the UE by the base station, carrying out inter-frequency measurement and/or inter-radio access technology measurement on a measurement gap appointed in thereceived measurement gap configuration information. The invention also provides a measurement gap configuration method performed at the base station, a measurement gap demand updating method performedat the UE, an updated measurement gap configuration method performed at the base station, and the corresponding user equipment and base station.

A novel and efficient connected mode cell reselection procedure is proposed to improve the mobility performance for user equipments (UEs) configured with extended connected mode Discontinuous Reception (DRX) cycle in LTE systems. A UE-centric mobility mechanism with which a UE performs cell reselection in RRC connected mode is proposed. The UE is allowed to select a target cell without handover signaling in the source cell and when needed to initiate signaling with the target cell, for which signal quality is much better. In this way, handover failures due to failed signaling in the source cell can be avoided. More specifically, the proposed mobility mechanism reduces signaling overhead and is inherently robust towards different DRX cycle settings, i.e., longer DRX cycles do not cause more failures, or more overhead, or more battery consumption.

Methods for avoiding handover failure are provided. The method includes determining, by a source Base Station (BS), to perform a handover of a User Equipment (UE); determining, by the source BS, whether a target BS connects with a user plane node serving the UE at the source BS; and releasing resources, when the target BS does not connect with the user plane node serving the UE at the source BS.

The embodiment of the invention discloses a method, system and equipment of selecting a target cell, which relates to the technical field of wireless communication and is used for solving the problem that a donor base station selects the target cell to which the relay node is not allowed to access for the relay node, so as to cause failed switch. In the invention, operation and maintenance (OAM) equipment allocates the donor attribute information of the base station to the base station; the base station sends the obtained donor attribute information to other base stations adjacent to the basestation; and the donor base station determines a donor cell to which the relay node is allowed to access according to the received donor attribute information and sends the information of the determined donor cell to the relay node, the relay node only reports the measurement information of the donor cell, and the donor base station selects the target cell performing cell switch for the relay node according to the measurement information reported by the relay node. According to the invention, the problem that the donor base station selects the target cell to which the relay node is not allowed to access for the relay node so as to cause the failed switch is avoided.

The present invention discloses a method for supporting a handover to a closed subscriber group (CSG) cell or a hybrid cell in a mobile communication system, and the method includes: sending, by a radio access network (RAN), information indicating that authorized public land mobile network (PLMN) information changes to a user equipment (UE); sending, by the UE, all PLMN identifiers (IDs) broadcasted by a target CSG cell to a source RAN in a measurement report; and selecting, by the source RAN or a source core network(CN), a target PLMN for the UE.

A method of providing spatial diversity for critical data delivery in a beamformed mmWave small cell is proposed. The proposed spatial diversity scheme offers duplicate or incremental data/signal transmission and reception by using multiple different beams for the same source and destination. The proposed spatial diversity scheme can be combined with other diversity schemes in time, frequency, and code, etc. for the same purpose. In addition, the proposed spatial diversity scheme combines the physical-layer resources associated with the beams with other resources of the same or different protocol layers. By spatial signaling repetition to avoid Radio Link Failure (RLF) and Handover Failure (HOF), mobility robustness can be enhanced. Mission-critical and/or time-critical data delivery can also be achieved without relying on retransmission.

The invention discloses a switching method and equipment based on an MBMS (multimedia broadcast multicast service). The method comprises the following steps that: when UE (user equipment) needs to be switched to a target base station from a source base station, if the source base station determines that the priority level of the MBMS of the UE is higher than unicast, and furthermore, the UE cannot be switched to a target cell of an MBMS frequency where the MBMS is in, wherein the UE is interested in the MBMS, the source base station releases the UE and notifies the UE and/or core network equipment that the releasing reason is that the continuity of the MBMS cannot be guaranteed. In the embodiment, when the MBMS frequency of the target base station congests, the continuity of the MBMS can be guaranteed furthest; the switching failure is avoided; and the user experience is enhanced.

The invention discloses an adjacent cell handover method, equipment and a system. The method comprises the steps that after a terminal is handed over to a target cell, a public frequency point configured to the target cell serves the terminal and receives measured identification, of an RRU position group in the target cell, reported by the terminal, and a measured signal quality value of the corresponding RRU position group, the identification of the first RRU position group with the measured signal quality value larger than a set threshold value is determined according to the measured signal quality value, the terminal is handed over to a determined dedicated frequency point of the first RRU position group from the public frequency point of the target cell, the dedicated frequency point serves the terminal, and after the terminal is handed over to the target cell, the public frequency point of the target cell is utilized as a handover medium to execute the handover operation. Thus, the problem that handover fails when the terminal is directly handed over to a certain RRU position group is avoided, and the handover success rate of the terminal in the heterogeneous network system is improved.

The invention discloses a mobile communication system and a method for switching to a closed user group cell. In the communication system, a source base station sends a first message to a core network, and the first message carries access control request information; the core network carries out access control on corresponding user equipment according to the access control request information and replies an access control result to the source base station through a second message, and the second message carries access control result information; and when the source base station starts switching from the user equipment to the closed user group cell, the source base station selects a target closed user group cell for the user equipment according to the access control result and then starts cell switching of the user equipment to the selected target closed user group cell. In the invention, before the switching is started in the source base station, the access control is carried out on the user equipment to be switched, and then switching is started according to the access control result, thereby a switching failure caused by an access control failure can be avoided, and the reliability and the speed of switching can be improved greatly.

The invention provides a directional switching method and apparatus, and relates to the field of communication. Directional switching is performed on a terminal. The method comprises the following steps: when the motion speed of the terminal is greater than a preset threshold, the terminal obtains a motion direction of the terminal; the terminal determines multiple neighboring cells of a primary serving cell on the motion direction; the terminal determines an active set and a monitoring set from the multiple neighboring cells, and establishes a connection with the cells in the active set; theterminal reports a switching event to a first network device; the terminal performs an update indication determined by the first network device according to the switching event; and the terminal establishes a connection with the updated primary serving cell and/or the cells in the updated active set. Therefore, by adoption of the directional switching method provided by the invention, the switching time of the terminal between different cells is shortened, and switching failure and call drop events of the terminal in a high-speed motion scene are avoided.

The embodiment of the invention discloses a method for maintaining loading. According to the method, when user equipment is switched to a 3GPP access network from a non-third generation partner planned (Non-3GPP) access network, a new loading ID allocated through a uniform mobile management entity (MME) and a former loading ID allocated through a former service gateway (SGW) when the Non-3GPP access network is accessed to a 3GPP core network ensure that loading maintenance and use can be carried out according to a uniform loading ID; therefore, problems including update loading failure and network switching failure caused by different loading IDs allocated when user equipment is switched to the 3GPP access network from the Non-3GPP access network can be avoided. The invention also discloses a device and a system for maintaining loading.

The invention discloses an inter-RAT switching method and apparatus. The method includes the following steps: a base station determines a terminal which is to be inter-RAT switched; if the terminal is provided with a bearing which is intended for transmitting VOLTE data, and no VOLTE voice conversation has been conducted through the bearing, then no inter-RAT switching is conducted on the terminal for the moment, and if the VOLTE voice conversation by the terminal through the bearing is detected, inter-RAT switching is conducted on the terminal. According to the invention, the method and the apparatus can prevent failure of switching caused by voice call of the VOLTE which is generated simultaneously with the inter-RAT switching.

The invention provides a method for realizing rapid switching; and the method comprises the steps as follows: (a) a mobile terminal is used for periodically measuring signal intensities of a service base station and a neighbor base station; when the signal intensity of one neighbor base station satisfies a switching condition, the terminal is used for setting the base station as a target base station to be switched; (b) the mobile terminal is used for applying to the target base station for special resources for switching through the service base station and is used for obtaining GPS (Global Positioning System) information of the target base station and public channel resources; (c) the mobile terminal is used for calculating uplink timing advance between the mobile terminal and the target base station according to the GPS information of the target base station; and (d) the mobile terminal is used for directly accessing the target base station into special resources for switching according to the uplink timing advance so as to finish switching operation. The invention further discloses a system for realizing rapid switching. According to the invention, on the basis that the switching reliability is guaranteed, the time spent in the switching process can be effectively reduced so as to satisfy switching delaying requirements in a communication system.

The invention discloses a method for avoiding a handover request from being rejected after adding a relay in LTE-A. The method is as follows: before sending a handover request, a source RN node obtains the load conditions of the cells where each candidate destination RN node is located by adding signaling and backhaul link conditions, and then comprehensively consider the load conditions, backhaul link conditions, or/and the signal strength of the cell where each candidate target RN node is measured by the user to select an appropriate target RN node to initiate a handover request. The invention avoids the rejection of the switching request or the switching failure by using the information such as the AC load and the channel condition before the switching, and reduces the switching delay.

The invention discloses a smart control method for a transformer cooler. The method includes the steps of obtaining the real-time temperature T of a winding of a transformer, setting the constant operation temperature value of the transformer, a control unit determining the cooler control strategy according to the real-time temperature T and the temperature changing rate DT/Dt, and outputting a control signal to the transformer cooler according to the strategy. The working of the transformer cooler can be controlled timely and effectively to lower the temperature of a transformer, prevent the transformer from being damaged, and prolong the service lifetime of the transformer. Switching of the cooler set of a cooler can be conducted to prevent frequent switching of cooler sets and prevent switches from being damaged. Stable operation of an entire cooler is ensured, and the transformer operates more stable.

The invention discloses method, device and system for maintaining adjacent district information among heterogeneous networks, wherein the method comprises the following steps of: receiving an updating message of the adjacent district information from an entity of a target network side; and updating the adjacent district information on an access network entity of a source network side according to the updating message of the adjacent district information. The invention is used for dynamically updating the adjacent district information to ensure the information synchronization among the heterogeneous networks and avoid terminals being unsuccessfully switched among the heterogeneous networks, and then the satisfactions of users are enhanced.

An ECU outputs a signal indicative of a target motor speed calculated based on a deviation between a target camshaft phase and an actual camshaft phase to an EDU. The EDU performs a feedback control of the output current (motor current) of the EDU so that the deviation is decreased, whereby an actual camshaft phase is feedbacked to a target camshaft phase. When the supply voltage of EDU is less than the operation limit voltage established higher than minimum operation assurance voltage, the variation of the target motor speed is restricted. Thereby, the output current of EDU is restricted, and further, when the supply voltage is less than minimum operation assurance voltage, the output current of EDU is intercepted.

The present invention discloses a channel switch method. The method includes the following steps that: the broadcast information of a current serving channel is monitored, when the broadcast information is received, the broadcast information is recorded and updated, wherein the broadcast information contains the base station parameter information and geographic positions of neighboring channels; when it is detected that the signal quality of the current serving channel drops to a preset value, whether a serving channel exists within a preset distance range is detected; if no serving channels exist within the preset distance range, a signal detection report as well the base station parameter information and geographic positions of the neighboring channels are extracted, and the extracted signal detection report as well as the extracted base station parameter information and geographic position of a neighboring channel which is nearest to a mobile terminal are sent to the current serving channel; and channel switch is performed according to information fed back by the current serving channel. The invention also discloses a mobile terminal and a computer readable storage medium. With the channel switch method, the mobile terminal and the computer readable storage medium of the invention adopted, the success rate of channel switch can be improved, and a call drop rate can be reduced.