646 results about "Heterogeneous wireless network" patented technology

An open and extensible framework for ubiquitous radio management and services in heterogeneous wireless networks is disclosed. A radio interface manager abstracts interface attributes of multiple heterogeneous network interfaces into a set of abstracted attributes for access by one or more applications.

A heterogeneous wireless network topology suited for low-power, short-range and ubiquitous ad-hoc communication. The network topology integrates different wireless transmission technologies, in particular to a wireless sensor network including different node types and communication technologies. The network is highly heterogeneous and can be operated according to the master-slave principle. The nodes can have different wireless communication means tailored to their individual role in the network and other constraints, thus allowing different communication patterns.

In one illustrative example, a mobile communication device operating in a wireless local area network (WLAN) of a communication network maintains an inter-enterprise voice call via its WLAN interface (e.g. 802.11/VoIP/SIP) with another communication device in the communication network. Communications of the voice call are maintained solely within the communication network and not routed through a conferencing gateway. During the voice call, a handover of the voice call from the WLAN to a wireless wide area network (WWAN) (e.g. GSM/GPRS) may or may not be required. In response to identifying a handover indication during the voice call, the mobile device causes a request message (e.g. a SIP INVITE message) to be sent over the WWAN to the conferencing gateway for establishing a first connection leg through the WWAN via its WWAN interface with a conference room of the conferencing gateway. The mobile device also causes a re-routing message (e.g. a SIP REFER message) to be sent over the WLAN to the communication device so that a second connection leg between the communication device and the conference room of the conferencing gateway may be established. The first and the second connection legs are connected together in the conference room of the conferencing gateway for the voice call. Advantageously, inter-enterprise voice calls in the communication network need not unnecessarily and unduly burden the conferencing gateway, unless and until a handover of the voice call between the WLAN and the WWAN is required. Variations and other PSTN conferencing gateway techniques are also described.

Provided are an apparatus and a method for providing a concurrent data service to an Mobile Station (MS) through a plurality of heterogeneous networks. In a method for providing a data service to an MS through different wireless networks, the MS measures channel qualities of at least one accessible wireless network and reports the measured channel qualities to an Internet Protocol (IP) packet controller. The IP packet controller selects wireless networks for data transmission on the basis of the reported channel qualities, distributes data destined for the MS, and transmits the distributed data to the selected wireless networks. The selected wireless networks receive the data from the IP packet controller and transmits the received data to the MS. The MS combines and interprets the data received from the selected wireless networks. Accordingly, it is possible to provide a seamless data service to the MS in service environments with a mixture of different wireless communication systems.

When a receive signal strength received from a target network that will perform the handoff is larger than a reference strength, software related to the target network is previously installed in the corresponding portable terminal, a wireless connection environment with the target network is configured by driving the software related to the target network at the time of determining that the handoff is performed, and performs the handoff to the target network in the portable terminal.

A method for automatically adapting a multi-protocol wireless device to facilitate a seamless multistage handoff according to various embodiments can include initiating a seamless multistage handoff process using a multi-protocol wireless device when the multi-protocol wireless device crosses a boundary area into an overlapping region where the multi-protocol wireless device is capable of simultaneously accessing a plurality of networks; and implementing the seamless multistage handoff process by performing at least a two-stage handoff process comprising a homogeneous handoff and a heterogeneous handoff without interrupting a communication call session conducted using the multi-protocol wireless device. A multi-network client device according to various embodiments can include a controller configured to support multiple independent call sessions, wherein the independent call sessions are concurrently conducted on a single wireless device through the use of parallel communication sessions and simultaneously connect the wireless device to a plurality of different networks hosting different content services.

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.

Disclosed herein is a handover method and apparatus for providing mobile Internet Protocol Television (IPTV) service over wireless communication networks. The handover method includes checking whether the strength of a signal received from a first base station of a serving first wireless network falls within a predetermined first threshold range; if the strength of the signal falls within the range, checking whether the strength of a signal received from at least one base station of a second wireless network is higher than a second threshold value required for handover; estimating the velocity and direction of a Mobile Node (MN) using location information received from a satellite; predicting a handover target base station using the estimated velocity and estimated location information; and, if the predicted target base station is one of base stations having the second threshold value, performing handover to the target base station.

The present invention relates to the provision of a middleware platform apparatus and related method operating on top of the heterogeneous wireless network. In other words, there is provided at least one bearer service in a heterogeneous wireless network for at least one application running at a mobile endpoint roaming in the heterogeneous wireless network. It is proposed to dynamically adjust (S10, S12) the at least one bearer service provided through the heterogeneous wireless network (10) according to an operational context of a mobile endpoint (12).

User equipment (UE), referred to herein as an interfering UE (130), can be detected that is proximate to a low-power cell (120), such as a micro-cell, pico-cell, femto-cell, a relay, or the like. The interfering UE (130) can be transmitting to the base station (110) at a power level that is producing high interference affecting uplink performance between a different UE and the low-power cell (120). A power adjustment message (140) can be generated at the base station (110). The power adjustment message (140) can be conveyed (156) from the base station (110) to the interfering UE (130). The power level adjustment message (130) can cause the interfering UE (130) to lower its transmission power (164), which reduces the high interference, thereby improving uplink performance between the different UE and the low-power cell (120).

The invention discloses a thing Internet gateway of a heterogeneous wireless network and a control method thereof. Function, such as protocol conversion, route selection, data exchange and the like, is provided in the network interworking process of different structures or protocols of the thing Internet. The gateway is a multi-layer cascading gateway and comprises a main gateway used for communication, sensor network management and topology management, and sub-gateways responsible for converting and penetrating a short-range wireless protocol and receiving front-end sensing network data, wherein each of the sub-gateways is connected with the main gateway. The limitation to the access ability of a sensor network is overcome, so that various front-end sensing nodes access a thing Internet platform without barriers; free networking of the sensor network front end is realized by taking full advantage of the conventional communication capacity and cascading gateway technology at the same time; the problems of the failure management and performance management of the sensor network front end are effectively solved; and the safety, the reliability and the stability of the sensor network and neurones are enhanced.

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 embodiment of the invention provides a method for sharing frequency spectrum resource of an isomerism wireless network and a device thereof. The method comprises the following steps: a bandwidth requirement of a current network in designated time is predicted; if residual bandwidth resource of the current can not meet the predicted bandwidth requirement, then other wireless network bandwidth resource in the same overlay area is searched, then bandwidth resource dispatch is carried out on the searched wireless network which has useable and unoccupied bandwidth resource so as to meet the predicted bandwidth requirement of the current network. Therefore, the method effectively improves the utilization rate of wireless resource of the isomerism wireless network, the access rate of customer service and the throughput of the system, thus improving the performance of the system.

The invention discloses a method for implementing heterogeneous and collaborative transmission in a heterogeneous wireless network by using collaborative trunk nodes; one or more collaborative trunk nodes are arranged, and each of which is provided with two set of antenna modules; a base station implements an optimized selection of proper collections of the heterogeneous and collaborative trunk nodes respectively for each destination user terminal that needs trunking, selects and determines antennas with proper number for the uplink and the downlink of each terminal, thus being convenient for acquiring self-adaptive diversity and reuse gain; the emission power of each antenna is reasonably set by comprehensively considering the transmission characteristics of the uplink and the downlink, thus ensuring the balance between the transmission performance of the first-hop link and the second-hop link and optimizing the integrative performance of the system. Based on the sufficient consideration of the existing constructions of wireless network frameworks, the invention discloses two set of antennas creatively, which are respectively used as heterogeneous trunk nodes of two-hips link transmission for implementing heterogeneous transmission, thus having the advantages of simple and convenient operation, flexibility, practicability, less investment, good effectiveness and great application generalization prospect.

The invention discloses an on-board network system and a backbone node message processing method thereof. In the system, a mixed layered network structure of combining a ratio Mesh backbone network and a heterogeneous access network is adopted, and the interconnection of various access networks is realized through an on-board backbone network, thereby the flexibility and the expandability of the system are improved. Meanwhile, a backbone node message processing method is adopted in the comprehensive message processing system of backbone network nodes. The method realizes the transformation of heterogeneous messages between a core network and an edge network, and a publishment/subscription mechanism based information distribution service is adopted, thereby the resource utilization ratio and the information access efficiency in complicated network environment are improved. The invention has military and civil values and particularly has wide application prospects in the fields of airborne command collaborative constellation of military integration information grids, civil aviation networked communication, navigation, monitoring, and the like.

The invention discloses a dynamic network selection method for optimizing the quality of experience (QoE) of a user in a heterogeneous wireless network. According to the method, an access network is periodically and dynamically updated according to the type of transmitted service and a network in which the current user accesses. The method comprises the following steps of: constructing user QoE demand functions of three service types and initializing variables in Q learning; performing network selection decision and execution switching by a Q learning method; and updating the variables in the Q learning method. According to the method, from the visual angle of the user, different service characteristics are distinguished, and the QoE of the user is optimized. According to the dynamic network selection method disclosed by the invention, heterogeneous wireless network resources can be efficiently used; based on reinforced learning, transcendental network state information is not needed; and the dynamic network selection method is higher in flexibility and can be suitable for various dynamic network environments.

In a wireless network discovery method according to an exemplary embodiment of the present invention, a) a propagation environment information message generated by using signal information received from the heterogeneous wireless networks is transmitted to the common core network, b) a wireless network discovery range generated by using the propagation environment information message is received from the common core network, c) it is determined if signal information received from a serving wireless network at a current location corresponds to the wireless network discovery range, and d) when the signal information corresponds to the wireless network discovery range in c), a network within the wireless network discovery range is discovered, when the signal information does not correspond to the wireless network discovery range in c), c) is periodically performed.

The embodiment of the invention discloses a heterogeneous network switching control method, a signal transmission method, signal transmission equipment and a communication system. In the embodiment of the invention, adjacent/covered overlapped base stations all adopt the combination design of first-type and second-type carriers, and at least a pair of the first-type and second-type carriers of the adjacent/covered overlapped base stations are identical in frequency; and the adjacent/covered overlapped base stations transmit physical downlink control channel (PDCCH) signaling, physical control format indicator channel (PCFICH) signaling, physical hybrid automatic repeat request indicator channel (PHICH) signaling and cell-specific reference symbols (CRS) in physical control channels of the first-type carriers, and transmit the CRSs on the second-type carriers. Therefore, user equipment (UE) can be ensured to obtain accurate physical control channel mobility measurement results of cells of the adjacent/covered overlapped base stations and timely trigger measurement reporting in same-frequency measurement; moreover, the service continuity of a user can be relatively better ensured, and unnecessary uplink/downlink data channel interference between neighbor cells can be avoided.

The invention discloses a heterogeneous network vertical handover method based on network joint effect optimization and load balancing and belongs to the technical field of wireless communication. According to the invention, load balancing and network joint effect maximization between access networks are realized through optimized vertical handover and access network selection of users of a commonly covered area of heterogeneous access networks. A user information matrix is established, a network joint effect function is modeled, and under the conditions of giving access network load balancing, joint network user handover times and the like, optimized user vertical handover and network election schemes are obtained through maximizing the network joint effect.According to the heterogeneous integration realizing network, user vertical handover and network selection schemes of access network load, user handover times, user business characteristics and other factors are comprehensively considered, the maximization of network comprehensive benefits and the enhancement of quality of service (QoS) for users are realized.