A CCN network node use reputation values for one or more interfaces to determine how to forward an Interest. During operation, the network node can receive an Interest or Content Object via a network interface, determines one or more candidate outbound faces for forwarding the Interest by performing a longest-prefix-matching lookup in a forwarding information base (FIB) using the Interest's name or name prefix as input. A respective FIB entry maps a name prefix to a forwarding rule that includes a corresponding outbound face for the name prefix. The node can determine a reputation value for each of the candidate outbound faces based on reputation information stored in association with the Interest's name or name prefix, and selects a candidate outbound face with a reputation value exceeding a first predetermined threshold. The node can then forward the received Interest via the selected outbound face.

Reputation-based strategy for forwarding and responding to interests over a content centric network

Disclosed are a method, device and system for joining a Neighbor Awareness Network (NAN) cluster. When a wireless device in a first NAN cluster scans and finds a second NAN cluster, if joining the second NAN cluster is necessary, then the wireless device leaves the first NAN cluster and joins the second NAN cluster; as the wireless device does not join a plurality of NAN clusters at the same time, the wireless device has low power consumption; in addition, as times goes on, when all the wireless devices in the first NAN cluster leave the first NAN cluster and join the second NAN cluster, the discovery window (DW) of the first NAN cluster on the working channel will not be occupied, thus increasing available resources on the working channel.

Method, device, and system for joining neighbor awareness network device cluster

Techniques and systems for prioritizing beacon messages are disclosed. Such a technique can include receiving, at a mobile device, beacon messages from multiple beacon devices over short-range communication links, the beacon devices being within a vicinity of an establishment, the beacon messages being configured to provide content associated with the establishment; determining, at the mobile device, priorities of the beacon messages based on one or more criteria; selecting, at the mobile device, a beacon message of the beacon messages based on the priorities to produce a selected beacon message; and presenting the selected beacon message through the mobile device.

Prioritizing beacon messages for mobile devices

A wideband printed dipole with V-shaped ground branches is proposed, which is designed for multiple-input multiple-output (MIMO) antennas. It is based on a dipole with an integrated balun, and V-shaped ground branches are introduced to improve the impedance matching. The bandwidth of this element reaches 62.3% (2.30–4.40 GHz), which covers all three WiMAX bands (2.30, 2.50, and 3.30 GHz) and the 2.40 GHz WLAN band. Based on this element, a quad-element MIMO antenna is designed and fabricated. By reusing the V-shaped ground structure between adjacent elements, the size of this quad-element antenna is only $0.31 \lambda \times 0.31\lambda \times 0.01\lambda $ . Meanwhile, a bandwidth of 60.6% (2.30–4.30 GHz) is achieved, in which the ${{\rm{S}}_{11}} , ${{\rm{S}}_{12}} , and ${{\rm{S}}_{13}} . Directional radiation patterns with 2.1 dBi average gain are attained, which are very stable throughout this band. This antenna system can be suitable for multielement MIMO devices such as wireless routers and adapters.

http://oa.ee.tsinghua.edu.cn/~zjzhang/papers_pdf/ap_2015_1.pdf

A Wideband Compact WLAN/WiMAX MIMO Antenna Based on Dipole With V-shaped Ground Branch

Techniques and systems for beacon triggered processes are disclosed. A described technique includes causing a beacon device to broadcast a beacon message, the beacon device being within the vicinity of an establishment; detecting a presence of a user of a mobile device based on receiving from the mobile device a first message that is responsive to the beacon message; retrieving a transaction record based on a user or mobile device identifier in the first message; generating and transmitting a second message based on the transaction record to facilitate a completion of a transaction associated with the transaction record at the establishment; the second message being configured to provide notification of an arrival of the user and dispatch an employee to meet the user and handle the transaction; and generating and transmitting a third message based on the transaction record to facilitate the completion of the transaction at the mobile device.

Beacon triggered processes

The wireless sensor network with energy efficient protocols includes a network of external sensors in communication with a data sink. The network utilizes an algorithm integrating a modified S-MAC (an algorithm for medium access control) protocol for decreasing energy usage in operating the node and associated sensors. A routing protocol is further integrated into the algorithm, the routing protocol being based upon cluster head rotation.

Wireless sensor network with energy efficient protocols

Incorporating phased array technique to scan the main beam of a Fabry-Perot cavity (FPC) antenna produces sidelobes proportional to the scan angle. An alternative dielectric-ferrite superstrate-based scan mechanism with controlled sidelobe level is presented in this letter. A beam scan of 24 °
 is demonstrated by axially magnetizing the ferrite part of the superstrate with ΔH = 0.25 T. Stepped dielectric part of the superstrate is optimized to reduce the sidelobe level of the FPC antenna by 4.49 dB. The fabricated antenna is tested to verify the simulated radiation patterns and reflection responses. The requirement of magnetic biasing can be considerably reduced using LTCC technology, where biasing coils are embedded within the ferrite superstrate.

Superstrate-Based Beam Scanning of a Fabry–Perot Cavity Antenna

The design of an eight-element array of V-shaped circular printed antennas for vehicular localization is presented. The proposed antenna operates in the 2.5-GHz band with a measured bandwidth (BW) of approximately 240 MHz. The simulation results and the field measurements of a fabricated array show a high degree of correlation. For a thorough understanding of the antenna operation, parametric sweeps are conducted to investigate the effect of the various antenna parameters on its resonance frequency and operating BW. The effect of mounting the antenna array on the rooftops of vehicles is investigated, specifically its effect on the half-power beamwidth (HPBW) and maximum gain. These results are based on measurements conducted at an outdoor antenna range facility.

An 8-Element Printed V-Shaped Circular Antenna Array for Power-Based Vehicular Localization

Axially magnetized ferrite loaded microstrip patch antenna (MPA) with tunable beam scanning properties is presented. Ferrite cylinders are optimally positioned within the near field region of the patch to introduce phase tapers needed for beam scanning. The interaction between the radiated EM wave and the gyrotropic properties of ferrites is controlled by varying the magnetizing fields. A beam scan of ° is achieved for a DC biasing range of 0–0.19 T. Simulated antenna properties are verified using experimental results. Recent LTCC technology allows the biasing coils to be embedded within the ferrite material to considerably reduce the required external magnetizing field.

/pdf/beam-scanning-properties-of-a-ferrite-loaded-microstrip-4pkit6fhne.pdf

Beam Scanning Properties of a Ferrite Loaded Microstrip Patch Antenna

The ferrite-loaded, Fabry-Perot Cavity antenna uses a novel superstrate based beam scanning/shaping mechanism by optimally placing three magnetized ferrite cylinders within the cavity. Beam scan in a certain direction required oppositely located ferrite cylinder to be axially biased using externally controlled DC magnetizing field. The FPC utilizes a composite dielectric superstrate to inversely relate the mainlobe-to-sidelobe ratio with scan-angle, which demonstrates larger reduction in side lobe level with increases angle of beam scan. The designed 10 GHz ferrite-loaded FPC antenna has dimensions of 6.4 cm×2 cm×1.6 cm. It achieves a −10 dB impedance bandwidth of 525 MHz, directivity of 11.04 dB and a broadside beam steering range of ±12° for 200 kA/m (0.25 T) changes in the externally applied axial magnetizing field.

Farooq Sultan

Papers

Wireless sensor network with energy efficient protocols

Superstrate-Based Beam Scanning of a Fabry–Perot Cavity Antenna

An 8-Element Printed V-Shaped Circular Antenna Array for Power-Based Vehicular Localization

Beam Scanning Properties of a Ferrite Loaded Microstrip Patch Antenna

Ferrite-loaded, Fabry-Perot cavity antenna