The invention discloses an indoor positioning method for goal nodes of a mobile social network. The indoor positioning method comprises the following steps of: respectively placing at least three access points AP in different positions, using known coordinate points as anchor nodes, obtaining a relational model between signal strengths and distances of all the anchor points, obtaining the signal strength value of each signal by using a mobile smart terminal, selecting the anchor nodes with the strongest signal strengths as the nodes needing to particle in positioning, respectively putting the three anchor nodes into the relational model between the RSSI (Received Signal Strength Indication) and the distances of the corresponding anchor nodes, and working out the distances from the mobile smart terminal to the corresponding anchor nodes; and working out the position coordinates of the mobile smart terminal by using an angular positioning algorithm. According to the indoor positioning method, the positioning of mobile nodes can be realized in a mobile social network environment, the impact of the environment on positioning is overcome to a certain extend, thereby the positioning accuracy is improved, and the positioning requirement can be basically satisfied in the mobile social network environment.

Indoor positioning method for goal nodes of mobile social network

Embodiments include methods and apparatuses for providing access to a network slice in a communication system In an embodiment, a network server that implements a Control Plane (CP) Network Function (NF) may receive a Non-Access Stratum (NAS) message from a wireless transmit and receive unit (WTRU) The NAS message comprises a Mobility Management (MM) message for registration and a Session Management (SM) messages for a specific service provided by the network slice After selecting the network slice, the network server may transmit the SM message to another CP NF in the network slice to establish a communication link between the WTRU and the network slice

Methods for service slice selection and separation

The invention discloses a broadband mobile communication method based on a multi-beam GEO satellite. The broadband mobile communication method based on the multi-beam GEO satellite mainly comprises the steps that spot beams at the Ka frequency band are adopted by NG+1 bidirectional feed links between a satellite-borne device and a ground station device, so that space division multiplexing is achieved for NG+1 times; a cellular network with NB cells is formed through NB bidirectional user links between the satellite-borne device and NT mobile user terminals based on an NB-beam satellite antenna, and space division multiplexing is achieved for NB/4 times with every four cells as a group, so that a 260 MHz bandwidth resource can be shared. The invention further discloses a broadband mobile communication system based on the multi-beam GEO satellite. According to the broadband mobile communication method and system based on the multi-beam GEO satellite, any one of the NT mobile user terminals can serve as an independent multimedia communication terminal as well as a local area network connected with a public Internet and can have access to a remote URL through the satellite links of the system, and an Internet service on the level similar to the 4G mobile communication level can be provided for a large number of people on various vehicles.

Broadband mobile communication method and system based on multi-beam GEO satellite

The embodiment of the invention discloses a method and a device for locating a wireless sensor terminal. The method comprises the following steps: on the basis of a wireless signal energy attenuation principle, mapping received signal strength indication (RSSI) obtained by all nodes onto probability weighted distance D in an off-line training manner by virtue of a Bayesian model; and more accurately locating the nodes according to a maximum likelihood estimation method and a Kalman filtering method from static and dynamic aspects. In the method, RSSI modeling is carried out statistically, which overcomes the defects such as influence on wireless terminal location caused by antenna directivity, environment and other factors for a small and medium sized mobile terminal signal as well as higher cost caused by the addition of a special sensor in the prior art; and in addition, relative to a classic single linear model or a segmented linear model, the model is updated by an on-line learning method so as to more accurately describe the situation of larger variance in a sample acquired by a small-sized wireless terminal, thus improving the practicability and applicability.

Method and device for locating wireless sensor terminal

Indoor accurate positioning method based on wireless sensor network technique

Wireless sensor network node positioning method based on distance assistance

The invention relates to a multiple-address signal processing method of a wideband satellite communication link in a next-generation communication system, belonging to the technical field of satelliteThe invention relates to a multiple-address signal processing method of a wideband satellite communication link in a next-generation communication system, belonging to the technical field of satellitecommunication and mobile communication and solving the problems that a future broadband multimedia satellite system has no optimal on-board processing method of multiple-address access system yet at communication and mobile communication and solving the problems that a future broadband multimedia satellite system has no optimal on-board processing method of multiple-address access system yet atpresent. The invention comprises two multiple-address signal processing methods of the wideband satellite communication link in the next-generation communication system; one method adopts an OFDMA modpresent. The invention comprises two multiple-address signal processing methods of the wideband satellite communication link in the next-generation communication system; one method adopts an OFDMA mode and is characterized in that fast Fourier transform is adopted to simply realize high-speed transmission processing, a circulating prefix is used so as to have stronger robustness to multi-path chane and is characterized in that fast Fourier transform is adopted to simply realize high-speed transmission processing, a circulating prefix is used so as to have stronger robustness to multi-path channel loss and intersymbol interference, and a receiving terminal is provided with a structure with channel estimate and balance functions; and the other method adopts an SC-FDMA mode and is characteriznel loss and intersymbol interference, and a receiving terminal is provided with a structure with channel estimate and balance functions; and the other method adopts an SC-FDMA mode and is characterized in that a discrete Fourier transform extended module is added after a serial-parallel module so as to sequentially enter a fast Fourier transform module and lower a PAPR value. The invention has thed in that a discrete Fourier transform extended module is added after a serial-parallel module so as to sequentially enter a fast Fourier transform module and lower a PAPR value. The invention has the advantages of simple method, reasonable design, reliable performance and greater popularization value.e advantages of simple method, reasonable design, reliable performance and greater popularization value.

Multiple-address signal processing method of wideband satellite communication link in next-generation communication system

The invention discloses a cross identity registration method for co-group users of a time division-long term evolution-based (TD-LTE-based) public network and cluster and relates to the field of wireless communication, in particular to a cross identity registration method for the co-group users of the public network and the cluster. The invention aims to solve the problem that cross identity registration cannot be realized under a TD-LTE public network and a TD-LTE private network. A method for switching users registered in the public network to users registered in the cluster is characterized in that switching is realized under the conditions that the users complete bidirectional authentication with a cluster application (APP) by a bearing surface and user group information and the priority are synchronous. A method for switching the users registered in the cluster to the users registered in the public network is characterized in that the switching is realized under the conditions that a cluster network is detached but registration statuses of the users in the public network are kept. The cross identity registration method for the co-group users of the TD-LTE-based public network and cluster is suitable for the cross identity registration of the co-group users of the TD-LTE-based public network and cluster.

Cross identity registration method for co-group users of time division-long term evolution-based (TD-LTE-based) public network and cluster

The invention relates to the cognitive radio network spectrum sensing technology in the technical field of wireless communication, in particular to a method for cooperative spectrum sensing based on the D-S evidence theory under the condition of malicious user attacks in a mobile model. The method aims to meet the demand for cooperative spectrum sensing based on the D-S evidence theory under the condition that malicious users provide false sensing information in a dynamic topological structure. The method for cooperative spectrum sensing is based on the D-S evidence theory under the condition that the malicious users provide the false sensing information in the dynamic topological structure. The method mainly comprises the two steps that firstly, a cognitive user authentication mechanism is implemented in a cooperative sensing meshed network, and the number of malicious cognitive users is reduced through the reliable authentication mechanism; secondly, the robustness of the data fusion algorithm of a cognitive network on the malicious attacks of the cognitive users is improved, and false sensing results of the malicious users are found and removed in time. The method is suitable for cooperative spectrum sensing based on the D-S evidence theory under the condition of malicious user attacks in the mobile model.

Method for cooperative spectrum sensing based on D-S evidence theory under condition of malicious user attacks in mobile model

The invention provides a service discovery system applied to an embedded platform and a service discovery method, and relates to a service discovery system and a service discovery method. The problems that the existing Ad hoc network protocol has complex design and complex programs on the embedded platform, and is a simple route establishing process but cannot obtain an actual service can be solved. The service discovery system applied to the embedded platform is a sensor network consisting of a plurality of nodes; and a route request module, a route response module, a route list establishing module and a route list maintenance module are nested in each node. The service discovery method based on the service discovery system comprises the following steps of: setting an ID (Identity) number for each embedded service node; broadcasting a route request message by a source node so as to search a route from the source node to a destination node; establishing an inverse route after receiving a route response message SS_REP; sending an instruction to the destination node by the source node so as to obtain service information; and meanwhile, maintaining a route list through the route list maintenance module. The service discovery system provided by the invention can be applied to the embedded platform.

Service discovery system applied to embedded platform and service discovery method

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