592results about How to "Reduce switching delay" patented technology

A novel method and system for enhancing user experience when switching channel in digital video broadcasting system is proposed. The invention proposes a server-based cache mechanism which caches all channels simultaneously in a cache server near from the video playing terminal. The channel switch latency could be heavily reduced since the initial part of the current GOP of any channel could be retrieved from the cache server, therefore the user experience is improved greatly.

Systems and methods for improving or suggesting alternatives to content surfing are provided. When it is detected that a user wishes to surf, a pipeline tuning sequence is implemented where by storing one or more frames of a first content selection to the user equipment and acquiring a subsequent content selection while concurrently displaying the previously stored one or more frames. Content suggestions, program listing grids, media guidance application and tuning hints, advertisements, digital audio, and live video may also be presented to user while content surfing. In some embodiments, content surf landing channels may be anticipated based on user history, user profiles, or any other suitable information. In some embodiments, thumbnails of the user's recently tuned, or paused on, content are displayed to the user while content surfing. In multiple tuner systems, more than one thumbnail may be displayed in full motion video.

When switching sources, resolutions or refresh rates in a video distribution network, switching times are reduced by maintaining video lock and security authentication between a video switcher and a video sink. The scaler maintains video lock and security authentication by continuing to generate video timing data during switching events. The scaler also facilitates an aesthetically pleasing transition by generating image content data prior to and after the switching event.

A method for reducing the number of channels that are scanned during a handoff situation for a wireless endpoint station in a wireless local area network (WLAN), such as an IEEE 802.11 network, by tracking past user movements within the WLAN. A suitable sequence of channels to be scanned is generated so that reduce the number of handoffs are reduced and the average time during a handoff is reduced. To reduce handoffs and handoff latencies, the principle of locality (user movement patterns tend to be repetitive) is used. By tracking the past handoffs, future handoffs are predicted.

An apparatus and method for handover of a Mobile Station (MS) in a wireless communication system are provided. The method includes, if a ranging request signal is received from the MS attempting access through a handover, determining if the BS and a serving BS of the MS are the same BS based on the ranging request signal, and, if the BS and the serving BS are the same BS, determining the effectiveness of a Cipher-based Message Authentication Code (CMAC) included in the ranging request signal using previous authentication information of the MS. The serving BS denotes a BS from which the MS has been serviced before the handover. The previous authentication information of the MS denotes authentication information that the serving BS has used for authenticating the MS.

The embodiments of the present invention relate to apparatuses and methods for resource management in a multi-carrier system wherein a plurality of component carriers (CCs) is defined per cell. According to a method in an apparatus corresponding to a radio base station, a message is assembled comprising information on the structure of the cell served by the radio base station; the information including one or more CCs used in the cell that is/are available for a user equipment for performing initial access in the cell. The method also comprises, transmitting the assembled message to the user equipment and indicating to the user equipment to what resources to use for random access in the cell. The exemplary embodiments of the present invention also relates to a method in the user equipment, to a radio base station and to a user equipment.

An apparatus, system, and method are directed to managing connectivity in a network by expediting the ability of a mobile node to send Internet Protocol (IP) packets subsequent to a handover. The mobile node is configured to determine an unconfirmed address for use on an access router. Upon establishing a link-layer connection, and before establishing a network-layer connection with the access router, the mobile node employs the unconfirmed address to send an IP packet to the access router. Employing the unconfirmed address prior to network-layer connectivity enables the reduction of handover latencies. If the access router determines that the unconfirmed address conflicts with an existing address, the access router provides a message to the mobile node indicating the conflict in addresses. In response to the message, the mobile node performs actions to resolve the address conflict.

A first aspect of the invention relates to a method for improving security at a local mobility anchor implementing both a network-based and a host-based mobility management scheme for managing the mobility of a mobile node. It suggests a method for verifying an attachment of a mobile node (MN) to a network element in a network. A second aspect of the invention relates to a method to be implemented in a mobility anchor node, which detects whether a race condition between registration messages occurs and resolves the most recent location of a mobile node. A third aspect of the invention relates to a method for detecting whether a binding cache entry for a mobile at a correspondent node has been spoofed and to a method for registering a care-of address of a mobile node at a correspondent node.

The invention discloses a fast switching method based on movement detection in a wireless network, comprising the following steps: movement detection: firstly, a distance between a AP and a movable node is estimated by collecting a RSSI value in a movable node data packet, secondly, the position information of the movable node is obtained by using node location so as to predict the move direction and the mode speed of the movable node with the position information; AP selection: proper neighbor AP is selected according to the move direction and the move speed of the movable node so as to be provided to the movable node for switching; and fast switching: the fast switching of the movable node is realized by amending traditional 802.11 protocol. The invention uses the movement detection method to predict the nest switched AP of the movable node by amending the traditional 802.11 protocol, when the movable node needs to be switched, only need to scan a signal path in which the preliminarily selected AP is located, therefore, switching time delay is reduced and the fast switching is realized.

A handover method of a mobile terminal between heterogeneous networks for facilitating the handover with pre-authentication procedure is provided. A handover method between heterogeneous networks includes receiving, at a mobile terminal connected to a source network, information on at least one target authenticator of a target network from a source authenticator in response to an attach request; creating an authentication key between the mobile terminal and the target authenticator selected among the at least one target authenticator through a pre-authentication process; determining, when the mobile terminal transmits a handover request to the selected target authenticator, whether the authentication key contained in the handover request matches with the authentication key stored in the selected target authenticator; and connecting, when the authentication keys match with each other, to the target network via the selected target authenticator.

The invention provides a SDN (Software Defined Network)-based heterogeneous network convergence framework. According to the framework, the core idea of control and data separation in the software defined network is referred, a controller is added in an EPC core network, user identity information is packaged to be a unique user identifier to serve as the identity certificate during the network access and switching process. The concept of the user identifier is used, a method of realizing virtual switching under the control of the controller is brought forward, the switching access process can be theoretically simplified, and network access time delay can then be reduced. After switching, the IP remains unchanged, the time spent on IP layer switching in the case of heterogeneous network switching is saved, the target of reducing the entire switching time delay is achieved, IP address management and user safety management in a mobile environment are facilitated as the IP is maintained, and a feasible solution is provided for solving the problem of seamless switching between the LTE network and the WLAN network.

A multi-attribute handover judging method for a heterogeneous vehicle communication network comprises the following steps: a handover management entity reads information on a candidate network in a field network report buffer entity, and the diameter of the coverage region of the candidate network is calculated; a mobility prediction information management entity acquires position information and speed information of a mobile user, and sends the position information and the speed information to the handover management entity; possible residence time and throughput capacity in each neighbor access network of the mobile user is estimated, when the throughput capacity during handover is higher than the throughput capacity in a normal state, the candidate network is added in an alternative list; an optimal target access network is determined to be switched into the network by the handover management entity via an analytic hierarchy process and according to service quality requirements; when the intensity of the current switch-in network signal is lowered to a threshold value, a handover execution instruction is sent to carry out handover. The multi-attribute handover judging method provided by the invention avoids unnecessary handover when a traveling vehicle passes through a region covered by heterogeneous access network, reduces handover delay and ensures the continuity of the communication.

The embodiment of the invention discloses a method for reducing handover delay in LTE systems. The method comprises that: source eNB sends a handover request to alternative target eNB of all alternative target cells of which the management meets handover judgment conditions, agrees to allow the alternative target eNB to which the alternative target cells with the handover request to reserve resources for current handover, and stores context of user equipment UE performing the current handover; and the alternative target eNB informs the source eNB of the information of the alternative target cells agreeing to the handover request. The method can trigger all alternative target eNB to be reserved resources for the current handover so as to reduce the handover delay caused by a currently selected target eNB not agreeing to hand over. In addition, in the process of handover execution, the source eNB simultaneously forwards data to all the alternative target eNB returning response to the handover request, so data loss caused by handover failure can be avoided.

The invention discloses an information center network mobility management method based on content popularity and belongs to the technical field of next-generation internet technology research. The method includes the steps that, a requester side moves, specifically, the content requester sends an Interest package request, a router in a network receives the Interest message, the local cache is searched first, the Interest message is directly returned to the requester if the content exists in the local cache, and otherwise a PIT table is searched; a proxy node compares the popularity of the content with a popularity threshold value K; a content source moves to a new position and sends a 'handoff completion' message to the proxy node, wherein it is indicated that handoff is completed if an M marking position is '2', and a K marking position is 'NULL'. According to the method, the mobility of mobile nodes in the content center network is achieved, and the mobility management method based on the proxy node and the web cache avoids communication outage caused by single-fault nodes and link failure; once the proxy node fails and can not serve any more, the network can automatically carry out handoff in a web cache mode, and therefore it is guaranteed that communications are conducted normally.

A method and apparatus of multicast traffic redundancy protection is provided. After a fault occurs, the VRRP selects a new active router and notifies the PIM routing protocol, and the PIM uses the new active router as its DR.

The invention discloses a method for realizing television channel switch, including: determining a channel where the current broadcast channel data source locates and a channel where the preset appointed channel data source locates, wherein, the appointed channel has one or a plurality of channels; performing receiving, channel decoding and caching to the data of the channel where the current broadcast channel data source locates and the data of the channel where the preset appointed channel data source locates, and performing data demultiplexing, audio and video decoding and broadcasting to the data cached in the channel where the current broadcast channel data source locates; when the broadcast channel is switched to any one appointed channel, directly processing and broadcasting the data cached in the channel where the appointed channel data source locates. The present invention also discloses a multimedia broadcast receiving terminal. Application of the present invention can greatly reduce the switching delay.

The invention discloses a method, a device and a system for switching between heterogeneous networks, and solves the problems of long wireless network switching time and low network switching success rate in the prior art. The method comprises the following steps that: a first network controller sends a network switching request to a second network controller of a second network to which a target cell belongs according to a measurement report sent by a user terminal in a first network to which the first network controller belongs; the first network controller receives a network switching command sent by the second network controller after determining that the user terminal is allowed to be accessed into the second network according to the network switching request; and the first network controller informs the user terminal to execute network switching according to the network switching command. Due to the adoption of the technical scheme of the invention, switching success rate between networks is improved.