486 results about "Handover procedure" patented technology

Methods and systems are provided for efficient handover of a media session between heterogeneous Internet Protocol (IP) networks. A mobile device with Internet access can operate a software program to communicate with a corresponding node. The corresponding node may access the Internet through a firewall which may include Network Address Translation (NAT)-routing functionality. The mobile device establishes a media session with a corresponding node via the transmission of a first media stream and receipt of a second media stream, and a media-control channel can optionally be implemented. The mobile device can acquire Internet access through a second IP address, and packets routed between the second IP address and the Internet may traverse a firewall. The mobile device can evaluate a set of network parameters at the second IP address from a stored Local Area Network (LAN) profile. A software routine can (i) evaluate that handover of the media session from the first IP address to the second IP address is preferred and (ii) select an efficient handover procedure according to handover procedure rules.

The invention targets at a QoS-aware handover procedure in a typical dynamic mobile ad-hoc scenario (cf. FIGS. 23 to 27) wherein the connectivity of fixed (AR1, AR2, CN) and/or mobile nodes (MN, M1, M2, M3, M4, EN1, EN2) is unpredictably time-varying and, due to the mobility of mobile nodes, handovers will inevitably frequently occur. Thereby, resources are pre-allocated along potential routing paths in advance, and the flow traffic is redirected to the path having the best available QoS capabilities. According to the new QoS situation of the selected path, adaptive real-time applications can have the opportunity to individually adjust traffic generation. With this concept, packet loss can be avoided and degradation effects on the running real-time application during the QoS-aware handover can be minimized. The QoS-aware handover procedure comprises the steps of handover candidates selection, handover initiation, QoS metrics probing and resource pre-allocation (soft reservation), QoS metrics collection, handover decision, handover confirmation (hard reservation), and reservation release. In particular, the proposed solution thereby pertains to a method for proactively probing the QoS situation of each potential routing path, pre-allocating resources along the best available QoS path before the handover of the QoS data flow to be transmitted to a new access point (AP) is initiated, providing efficient resource reservation management and maintenance within the underlying mobile ad-hoc networks and incorporating advanced QoS support features offered by adaptive real-time applications. The invention further proposes an "information dissemination" approach, which optimizes prior-art address resolution mechanisms.

Disclosed is a method for enabling a mobile station existing in a serving cell area to perform a handover procedure in a broadband mobile communication system including the mobile station, a serving base station providing a service to the mobile station, and one or more target base stations containing at least one target cell area overlapping with the serving cell area occupied by the serving base station. The method includes transmitting a handover request message from the mobile station to the serving base station when it is detected that a performance of a handover is necessary; and transmitting a handover indication message containing handover cancel information to the serving base station when the mobile station determines a cancel of the handover while the mobile station is being handed over to one or more target base stations by the serving base station.

Disclosed is the radio (wireless) communication system providing a radio communication service and the terminal, and more particularly, to a method of handling an uplink synchronization timer during a handover procedure in an Evolved Universal Mobile Telecommunications System (E-UMTS) evolved from the Universal Mobile Telecommunications System (UMTS) or a Long Term Evolution (LTE) system.

A method, system and device are provided for avoiding in-device coexistence interference between different radio technologies deployed in adjacent bands on the same device by controlling and separating the LTE signaling and the non-LTE signaling using dedicated time intervals to separate LTE signaling from non-LTE signaling. In addition, coexistence mode handover procedures are provided which use threshold-based triggering events to avoid coexistence interference and to prevent ping-pong effects by establishing a “keeping time” parameter so that a non-interfering network node does not switch back to an interfering network node after handoff. Coexistence interference is also avoided by providing a hybrid automatic repeat request (HARQ) mechanism which accounts for coexistence interference by providing a fixed or variable on-interval parameter and an activity parameter indicating whether non-LTE activity is present to maximize a time interval for non-LTE devices without interference from LTE activity on the same device.

Handover procedures take into account adaptive antennas that employ narrow, directional antenna beams. A connection is established with a mobile station by way of an originating radio base station. Downlink signal quality measurements associated with cell-wide transmissions from neighboring base stations are detected by the mobile station and reported to the radio network. The handover target base station is determined based upon those signal quality measurements. A desired antenna beam at the target base station is also determined for communicating with the mobile station based on uplink measurements made by the target base station. A handover connection is established between the target base station and the mobile station using the desired antenna beam at the target base station.

The present invention relates to a handover procedure, and more particularly, to a method of reducing latency in performing handover using fast ranging. The present invention includes the steps of receiving a handover message including a specific ranging code and uplink resource information from a serving base station and transmitting the specific ranging code to a target base station using the uplink information.

A method and apparatus for performing a handover procedure in a wireless communication system including a mobile relay node is provided. A target evolved NodeB (eNB) receives a handover request message containing a list of a plurality of user equipments (UEs) on the mobile relay node or a group handover indication. The target eNB performs an admission control for the plurality of UEs; and transmits a handover request acknowledge message containing a list of admitted UEs for handover among the plurality of UEs.

The present invention relates to the field of mobility in heterogeneous wireless networks. In particular, the invention proposes a system and method of providing User Equipment (UE) initiated and assisted backward handover in the heterogeneous wireless networks. Depending on certain criteria, the UE may decide that if it needs a handover from a serving network to a target network. The UE initiates the backward handover by sending handover request message to the target network through the serving network. The serving network checks for the capabilities of the UE and authorizes the backward handover. The target network prepares for the backward handover and informs the UE when the target network is ready. The UE then starts the handover procedure.

A method of initiating handover pre-preparation for a mobile device in a wireless communication system is disclosed. The method comprises the steps of receiving a pre-prepared handover command from a source base station, wherein the pre-prepared handover command includes context of a target base station, whereby the mobile device does not perform a handover procedure based on the pre-prepared handover command and keeping the context for a period of time.

A method, system and device are provided for avoiding in-device coexistence interference between different radio technologies deployed in adjacent bands on the same device by controlling and separating the LTE signaling and the non-LTE signaling using dedicated time intervals to separate LTE signaling from non-LTE signaling. In addition, coexistence mode handover procedures are provided which use threshold-based triggering events to avoid coexistence interference and to prevent ping-pong effects by establishing a “keeping time” parameter so that a non-interfering network node does not switch back to an interfering network node after handoff. Coexistence interference is also avoided by providing a hybrid automatic repeat request (HARQ) mechanism which accounts for coexistence interference by providing a fixed or variable on-interval parameter and an activity parameter indicating whether non-LTE activity is present to maximize a time interval for non-LTE devices without interference from LTE activity on the same device.

An approach is provided for graceful shutdown and startup of spoofing when a handover procedure is performed. A handover of a performance enhancing proxy (PEP) session associated with a transport connection is detected. A shutdown procedure is initiated to stop spoofing of the transport connection in response to the detected handover. The shutdown procedure avoids teardown of the transport connection during the handover from a first link to a second link of a communication system.

A method, system and device are provided for avoiding in-device coexistence interference between different radio technologies deployed in adjacent bands on the same device by providing coexistence mode handover procedures which establish an updateable “keeping time” parameter to prevent premature switch back or handover to an interfering network node after handoff.

Provided are apparatuses and methods for providing security measures for a handover execution procedure in a communication network. In one example, the handover procedure is initiated by more than one base station. In another example, a base station may not launch a Denial or Service (DoS) attack towards other base stations or towards a core network using handover signaling messages. For example, a user device may send at least one encryption parameter, such as a Nonce associated with the user device to a source base station. Handover of the user device from the source base station to a target base station may be accomplished based on the at least one encryption parameter to avoid the DoS attack.

A method and apparatus for performing a handover procedure in a wireless communication system is provided. A master eNodeB (MeNB), in dual connectivity, performs a handover decision from a source secondary eNB (SeNB) to a target SeNB, and transmits an offloading request message, which includes contexts of E-UTRAN radio access bearers (E-RABs) to be offloaded and an offloading indication, to the target SeNB. The MeNB receives an offloading request acknowledge message, which includes identifiers (IDs) of E-RABs accepted by the target SeNB, as a response to the offloading request message from the target SeNB, and transmits an offloading mobility indication to a user equipment (UE).

Intercell handover method in UMTS mobile systems in TDMA-SCDMA technique (and also FDMS-SDMA) with full duplexing of the TDD type. The complexity of the technique adopted requires a frame synchronization mechanism employing a downlink pilot signal, broadcasting transmitted by the base station, echoed by signature sequences transmitted by the single Mobile units in the procedures foreseeing an uplink access. The above, together with the high cipher speed (1.28 Mchip) imposed by the CDMA technique, makes inappropriate the addition of other fields to the sequence of the downlink pilot, which shall remain a pure synchronization sequence. Contrarily to the GSM, a field is missing in the synchronism burst for the transport of the system frame number FSN, absolutely necessary for the iperframe synchronism and the starting of ciphering on the channel. The information on SFN is included in the common signalling channel as other broadcasting information.

A method and device for performing handover by a mobile terminal from a source base station to a target base station, the mobile terminal having a RRC layer, a RLC layer and an PDCP layer. The method includes receiving a handover initiation message; and performing handover from the source base station to the target base station, including reassembling RLC SDUs from at least one PDU when possible and delivering the reassembled RLC SDUs from the RLC layer to an upper layer.

A method for processing a handover procedure in a mobile communication system is disclosed. After a type of handover is recognized based on information included in a handover command, a radio resource reconfiguration operation is selectively performed or a data transmission start point is adjusted, to thereby minimize an unnecessary operation occurring in the handover process and optimize a data transmission between a user equipment and a base station.