331results about How to "Reduce call drop rate" patented technology

The invention discloses a method for selecting cell access for terminal equipment, which comprises the following steps: comparing the traveling speed of the terminal equipment and a threshold value; when the traveling speed of the terminal equipment is not smaller than the threshold value, selecting a private network cell to access the terminal equipment; and when the traveling speed of the terminal equipment is smaller than the threshold value, selecting a public network cell to access the terminal equipment. The invention also discloses network equipment for selecting the cell access for the terminal equipment. The communication quality of the terminal equipment can be improved by adopting the invention.

This invention provides a switch control method in a multi-frequency point system including: a user device gets related measurement configuration parameters to configure lists of local areas, the device reports the measurement result of the local and the adjacent areas, a wireless network controller receives the result to maintain the target area list used in switch, if the user device receives the switch instruction from the controller, it accesses the main carrier instructing said switch order to set up a new wireless connection, said device should send the information of finishing the switch to the controller and works on the main carrier then to be adjusted to the sub-carrier and the user device sends information for the successful switch.

The invention discloses a vertical switching method based on dynamic weight optimization in a heterogeneous wireless network. Aiming at the problems that the mobility of terminals and the time-varying characteristics of network states lead to dynamic performance, different service types have personalized requirements for networks, and poor vertical switching performance is caused, performance optimization is carried out from the following aspects: firstly, separately calculating subjective weights and objective weights of network parameters by using an analytic hierarchy process (AHP) and an entropy evaluation method, and initializing the combined weights based on a linear single objective optimization (SOP) theory; secondly, introducing weight adjustment factors, and dynamically adjusting the weight of each network parameter to adapt to the dynamic change performance of network conditions; and finally, selecting an optimum access network by adopting utility functions with adjustable switching thresholds based on the personalized requirements of a terminal. Experimental results show that by adopting the vertical switching method disclosed by the invention, the switching blocking rate and call drop rate of the terminal can be effectively reduced, unnecessary switching can be reduced, 'ping-pong effects' can be reduced, and the comprehensive performance of vertical switching can be improved.

The invention provides a method for balancing inter-cell load in an LTE mobile communication network. The invention reduces the range of seeking a terminal which meets load balancing switching by marking the terminal which meets the requirement of load balancing switching by utilizing a balancing event measurement report, thereby shortening the load balancing execution time; and in addition, the invention better realizes the inter-cell load balancing through periodic load balancing processing and two-step load balancing switching processing, prevents new load unbalancing generated by the load balancing process, enhances the load balancing convergence rate, effectively prevents the ping-pong effect, effectively reduces the network overhead because neighbour cells can report respective resource states only after a current cell is overload, enhances the utility ratio of wireless resources and reduces the dropped call rate.

The invention provides a random access method and system of a TD-LTE virtual private network based on dynamic priorities. The random access method comprises a leader sequence transmission step, the random access responding step, the MSG3 sending step and the conflict resolving message step. The random access method and system of the TD-LTE virtual private network based on dynamic priorities have the advantages that the method of combining different back off algorithms and the repeated time upper limit is adopted with different priorities to ensure that the average access delay of a high-priority user is short, and the call drop rate of the user is reduced at the same time; the priority classification mode is dynamically selected according to the system load condition to improve the throughput of a system and reduce the call drop rate.

The invention is a switch method between CDMA system and GSM system which supporting CDMA / GSM double model mobile station, the invention uses the interconnecting function entity (IIF) in the core network of CDMA system and GSM system, masks the core networks of the two basic different protocol standard, each MSC of each system uses the IIF as the MSC belonging to the same system, the parameter of measurement and service needed by the core network MSC and the wireless chain resources information of target network needed by the service core network are added into the switch instruction information correspondent to the service core network E interface, and they are transmitted to the correspondent target MSC through IIF entity by service MSC, realizes the E interface instruction chain and instruction message translation converting function between the CDMA system core network instruction and the GSM system core network, it provides voice service chain relay function between CDMA service MSC and GSM target MSC.

The invention discloses a method and LTE (long term evolution) system for across node B handover of a user terminal. The method comprises: after receiving a handover request from the user terminal, a target evolved node B (eNB) utilizes a target cell handover information to generate target cell reestablishment information and locally store the target cell reestablishment information; after receiving a reestablishment request from the user terminal, the target eNB judges whether the reason values in the reestablishment request are handover failures or not, if not, the target eNB matches the target cell reestablishment information with the user terminal; and then reestablishment succeeds. Compared with the prior art, the handover method and the LTE system have the following advantages: when the UE sends the reestablishment request to the target eNB and if the reason values in the reestablishment request are not handover failures, the target eNB matches the reestablishment ready information generated by target cell information with a UE (user equipment) entity, and then the reestablishment succeeds. By utilizing the method, the success rate of the establishment during the handover process is improved, thereby ensuring that the UE has no dropped call, and reducing the dropped call rate of the UE.

The invention discloses a radio resource control connection reestablishment method, radio resource control connection reestablishment equipment and a radio resource control connection reestablishment system. The method is applied to a system comprising user equipment ,a service base station and a non-service base station and comprises the following steps that: after detecting a radio link problem, the user equipment sends a measurement report to a service cell of the service base station to ensure that the service cell prepares switching with a non-service cell of the non-service base station according to the measurement report, wherein the measurement report comprises indication information which is used for indicating that the measurement report is triggered by a radio link; and after determining a radio link failure, the user equipment triggers a radio resource control connection reestablishment process, selects a cell and initiates the radio resource control connection reestablishment for the selected cell. The technical scheme of the invention improves the success rate of the radio resource control connection reestablishment and fulfills the aim of reducing the user drop call rate and improving user experience.

The method of RNC controlled switching between different frequencies and different systems for measurement includes the following steps: for RNC to determine whether to re-assign UE business channels based on the received measurement report from UE; and for RNC to determine to which time interval the UE business channels will be assigned in case of re-assigning. The present invention determines the channel transfer based on the information in UE measurement report, and this can avoid failure in measurement and ensure communication quality.

The method includes steps: (1) network side sets up threshold value of position for mobile station; and informing the set up threshold value of position to mobile station; (2) mobile station monitors and determines whether own position reaches to the threshold value of position in step (1) in real time; when reaching the threshold value of position, mobile station makes report to network side; (3) after receiving report in step (2), network side switches mobile station between adjacent cells. Based on accurate position, the invention makes mobile station switch between adjacent cells.

The invention relates to a method for network coverage optimization processing, which comprises the steps: in step S102, collecting first coverage optimization data related to a local party and secondcoverage optimization data related to other base stations by a base station, judging whether coverage optimization is carried out or not in the local party according to a predetermined decision rule,if so, carrying out step S104, or else, carrying out step S106 and step S108, in step S104, if so, carrying out adjustment by the base station according to a first predetermined coverage optimizationrule, in step S106, or else processing the first coverage optimization data and the second coverage optimization data, reporting the data to a network administration node, determining an adjusting result by the network administration node according to local configuration data, the first coverage optimization data, the second coverage optimization data and a second predetermined coverage optimization rule, informing the base station and / or other base stations of the adjusting result, and in step S108, carrying out corresponding adjustment by the base station and / or other stations according tothe adjusting result. In addition, the invention also discloses a system for network coverage optimization processing.

A neighbor list of potential hand-off base stations is varied to control call blocking and dropping rates. The list may be varied in accordance with real-time traffic flow criteria.

A method, an apparatus and a system for key derivation are disclosed. The method includes the following steps: a target base station) receives multiple keys derived by a source base station, where the keys correspond to cells under control of the target base station; the target base station selects a key corresponding to the target cell after knowing a target cell that a user equipment (UE) wants to access. An apparatus for key derivation and a communications system are also provided.

The invention discloses a method and system for updating a cell in a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) network and user equipment, which are used for reducing the call drop rate of the UE in the TD-SCDMA network. The cell updating method comprises the following steps of: when the UE confirms to meet a preset cell update triggering condition, selecting a target cell according to a latest measurement result of common-frequency measurement and pilot frequency measurement and sending a cell updating message, wherein the cell update message carries the identification information of the target cell; and after the UE receives a cell update confirmation message returned by an RNC (Radio Network Controller), accessing a new radio resource distributed to the UE in the target cell, which is indicated in the confirmation message.

The invention discloses a determination method and device for a voice communication network. The method comprises the steps that a terminal in support of a VoLTE (Voice over Long Term Evolution) obtains a network frequency point at which the terminal currently resides, and the voice indicator information and signal quality information of the network frequency point, when a voice communication demand is detected, wherein the signal quality information may comprise reference signal receiving power and a signal to noise ratio, and the voice indicator information may comprise a call success rate, a call drop rate and an SRVCC (Single Radio Voice Call Continuity) switching rate; and the terminal determines the voice communication network of the terminal based on the voice indicator information and the signal quality information. In this way, the terminal can carry out comprehensive judgment according to the voice indicator information and signal quality information corresponding to the frequency point of a service cell of the terminal, the suitable voice communication network is selected, the voice call quality of the terminal is improved, moreover, SRVCC switching signal processes are reduced, and network loads are reduced.

The invention relates to a combined switching method based on load balancing in low-orbit satellite communication, and belongs to the technical field of satellite communication switching. The method comprises the following steps: 1) judging whether an overload satellite exists or not to determine whether to trigger switching, and selecting a proper target satellite by a target satellite selectionmethod based on the signal strength of adjacent satellites received by a mobile user and multi-attribute decision of the load condition of the adjacent satellites; 2) judging whether the time when thereference signal receiving power and the reference signal receiving quality of the source satellite and the target satellite meet a switching triggering condition is greater than a time delay threshold or not to determine whether to trigger switching or not; and (3) if the step (1) and the step (2) meet the switching triggering condition, executing switching through the inter-satellite switchingsignaling process provided by the invention. The switching failure rate and the call drop rate are reduced, the probability of ping-pong switching is also reduced to a certain extent, and after switching is finished, a mobile user can obtain better service quality.

The invention provides a mobility management method based on a clustered superdense small network in a 5G system. The mobility management method comprises the following steps: dividing a superdense cell into a plurality of microcell clusters, wherein each microcell cluster has a common pilot frequency; predicting the channel condition of the cell by using a birth-death model, and according to the quality of a received cell signal, comprehensively considering the business condition and the mobility state of a user terminal and selecting a proper base station as a switching target, wherein the blocking rate of new equipment calling and switching can be obtained, a correct switching strategy is established, the switching success rate is improved, and the call drop rate of the user terminal and the blocking rate of calling are reduced; when equipment is in an idle state and the user terminal is in a low-speed state, switching to a pilot frequency base station of a microcell; when the user terminal is in a medium-speed or high-speed state, switching to a macro base station; when the equipment is in a connection state, namely when a business service exists, if the user terminal is in the low-speed state, switching to a small base station of the microcell; when the user terminal is in the medium-speed or high-speed state, switching to the macro base station.

The invention discloses a radio bearer control (RBC) message processing method and device. A network device sends an RBC message to a terminal and starts a first timer, the timing duration of the first timer being determined according to the transmission parameters of the network device and the terminal; if the network device detects a wireless link failure message of the terminal or receives a designated type message sent by the terminal before time out of the first timer, resource return is carried out on the terminal, and a service base station of the terminal is requested to delete the wireless link of the terminal to trigger the terminal to carry out cell updating, an RNC is allowed to return network side resources in time according to the difference of the transmission parameters so as to prevent meaningless waiting, and meanwhile, the wireless link is deleted to urge the terminal to report the cell updating to carry out rescue.

A method, an apparatus and a system for key derivation are disclosed. The method includes the following steps: a target base station) receives multiple keys derived by a source base station, where the keys correspond to cells under control of the target base station; the target base station selects a key corresponding to the target cell after knowing a target cell that a user equipment (UE) wants to access. An apparatus for key derivation and a communications system are also provided.

The invention relates to the field of communication, and discloses an intra-cell handover method and device. The intra-cell handover method comprises the steps that: a base station receives a UE (user equipment) context modification request message which is sent by a core network, wherein a first context resource corresponding to UE is stored in the base station; the base station generates a second context resource corresponding to the UE according to the UE context modification request message; the base station sends an RRC (Radio Resource Control) connection reconfiguration message to the UE; and if the base station receives a first RRC connection reestablishment request message sent by the UE and an identifier corresponding to a context resource carried in the first RRC connection reestablishment request message is an identifier corresponding to the second context resource, the base station completes RRC connection reestablishment with the UE by using the second context resource and releases the first context resource. The intra-cell handover method and device disclosed by the invention are used for solving the problem that in the prior art, in the case that intra-cell handover is abnormal, a call drop rate of the UE is relatively high, so that communication quality is influenced.

The invention discloses a method for generating a key. The method is suitable for a scene of relay station switching and comprises the following steps that: a source base station calculates a key parameter K1 according to a key K between the source base station and a relay station and an identification parameter of a target base station, wherein the identification parameter of the target base station is used for uniquely identifying the target base station; and the source base station sends the K1 to the target base station so that the target base station acquires a key K2 between the target base station and the relay station according to the K1. The embodiment of the invention also provides a system for generating the key and the base stations and the relay station for the relay station switching scene. Through the technical scheme provided by the embodiment of the invention, the relay station can generate the key used between the relay station and the target base station, or the target base station generates the key used between the target base station and the relay station, so that the double parties can communicate with each other smoothly and communication security is enhanced.

The invention is a handover determining method in mobile communication system, comprising: 1) network side sends link loss measurement control command to user terminal to appoint the parameters the user terminal needs to measure; 2) the user terminal receives the control common and measures, and reports the measured results in an event triggered mode or periodically, where the measured results include the preset number of larger link loss difference integration values or link loss difference integration values larger than first threshold value, selected from the adjacent cells which require measuring; 3) the network side selects a target cell of local terminal from the reported adjacent cells and switches terminal connected wireless link from service cell to target cell. And it can switch terminal a cell which can provide better link condition.

The invention discloses a service-preference-and-network-condition- based vertical handoff method (SNVHO). The handoff method employs a new algorithm for computing weights. Related weights are divided into two kinds: one kind is subjective weights targeting at service preferences and the other kind objective weights determined by network characteristics. An analytic hierarchy process (AHP) is employed, and a decision matrix obtained through the utilization of relative importance is utilized in order to compute the weight of each handoff decision factor; and finally, final decision is carried out through the utilization of a accumulative sum of a product of each attribute multiplied by the corresponding weight. According to the method of the invention, targeting at different service calculation weights, the weights are dynamically changing instead of being fixed values, so that defects of setting the fixed values are overcome. A simulation result show that the service-preference-and-network-condition-based vertical handoff method (SNVHO) is greatly improved in terms performance parameters such as the vertical handoff times, the system throughput, the call drop rate and user costs.

The invention relates to a cellular communication system comprising a plurality of frequency bands. A central frequency band processor (317) located at a Base Station Controller (BSC) (303) determines a preferred frequency and sets a frequency band preference parameter accordingly. The frequency band preference parameter is communicated to a plurality of base stations (305, 307, 309). Each base station has a handover controller (311) which determines handover parameters for a plurality of candidate cells for a handover of a subscriber unit. The handover parameter values associated with the first frequency are compensated by the frequency band preference parameter, and the handover controller (311) reorders the candidates accordingly. A target handover candidate is then determined from the reordered list. The invention is particularly applicable to a GSM cellular communication system.

The invention discloses a local bearing management method and device. According to the invention, a local eNB manages and configures own public resource and a UE special resource; and whenever a macro eNB decides to carry out the operation of separating a control plane and a user plane, the local eNB is responsible for distributing a UE dedicated random access resource and exclusive configuration information of an RLC, an MAC, a physical layer and the like for DRB separation, and notifies the public resource information of a local cell to the macro eNB. According to the invention, local bearing management can be realized in a bearing separation network.

The invention discloses a method and a device for determining a communication extension bias boundary, and relates to the technical filed of communication. Different CRE bias upper bounds are set by a first base station according to different second base stations, so that the number of user equipment (UE) unloaded to the second base stations can be increased, and call drop rate of the UE is reduced. Signal to interference plus noise ratio (SINP) of the user equipment in a coverage area of the second base stations is accounted and determined, community extension bias boundary upper bounds of the second base stations are calculated according to a first SINR and are sent to the first base station or a network management system. The method and the device are suitable for determining the community extension bias boundary.

The invention discloses an enhancement type load balancing method based on adjacent region load information, which mainly solves the problem that the throughput of a system is reduced as the call of a user is dropped caused by adjacent region interference when the user is switched in the load balancing. The enhancement type load balancing method is mainly and technically characterized in that an original region can detect the load information of the original region, and trigger the load balancing; the original region can generate a target region list; the original region can calculate priority weights of target regions; the target region list is ranked according to the priority, and a primary termination threshold of the load balancing of each target region is calculated; the original region orderly selects the target regions from the target region list to carry out load transfer; and after the load balancing is finished, the original region waits for the nest load balancing execution cycle. The enhancement type load balancing method can efficiently solve the problem that the call of the user is dropped because of strong interference when the user is switched in the load balancing, thereby enhancing the service quality of the user in the system and the capacity of the system.

The invention discloses a handover measurement control method for a mobile communication system. In the method, by virtue of architectural characteristic of a TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system, RNCs (Radio Network Controllers) can carry out information interaction via an Iur interface or a core network (CN) and maintain a neighboring cell information list in real time; and according to the maintained neighboring cell information list, the RNCs only configure the cells with light load, small interference and good link quality in the neighboring cell information list in a measurement control message issued to UE (User Equipment), while the cells with severe or worse information are not used as measuring objects of the UE so as to prevent the cells with insufficient available resource, too big interference or poor communication link quality from being used as the measuring objects, which decreases number of the cells measured by the UE, reduces measuring burden of the UE, lowers time cost during the measuring process, realizes prior optimization for a measuring object list of the UE to a certain degree and reduces trial times during the handover process so as to reduce handover delay and drop call rate during the handover process and improve handover success rate.

The invention provides an evaluation method for measuring a TD-SCDMA signal for a 3D incident, and an accepting signal of a current TD-SCDMA sub-district is used for evaluating. The invention also provides a report method for measuring a 3a incident, which includes the following the steps: step A, a incident parameter is established and initialized; step B, a quality evaluation is operated for the accepting signal in the current TD-SCDMA sub-district; step C, the quality evaluation is operated for the accepting signal in each option GSM neighbor sub-district, and a symbol variable for a incident trigger is upgraded; step D, a judgment for the 3a incident is triggered; step E, a report for the 3a incident is sent. The invention has the advantage that a descending signal quality is truly reflected; the method can timely start, quit an incident evaluation under the condition that the signal in the service sub-district is changed; a calculation for a service sub-district and the neighbor substrict is absolutely operated, and time for the service sub-district is priorly calculated; the symbol variable for the incident trigger is increased.