摘要:
A method and apparatus for communications resource allocation in a wireless communications system having a total system bandwidth. A service area is divided into a plurality sectors. A first set of base station antennas are positioned within a first set of sectors. The first set of antennas have main beams set at a first set of angles, and each antenna corresponds to a sector within the first set of sectors. A second set of base station antennas are positioned within a second set of sectors adjacent to the first set of sectors. The second set of antennas have main beams set at a second set of angles, and each antenna corresponds to a sector within the second set of sectors. Each sector is assigned a portion of the total system bandwidth.
摘要:
There is disclosed a method for making a nano-composite gas sensor. At first, there is provided a substrate. Then, electrodes are provided on the substrate in an array. Finally, a gas-sensing membrane is provided on the electrodes. The gas-sensing membrane includes a nano-conductive film and a peptide film.
摘要:
The invention provides a system that implements an algorithm for integrated link adaptation and power control to achieve specified error rates and to improve an overall throughput for real-time applications in wireless packet networks. The system initially divides wireless terminals into groups according to their signal path gains. Afterwards, the system can periodically adapt transmissions (i.e., link adaptations) based on the required error rates, actual error statistics and average transmission power for each wireless terminal group. Furthermore, transmission power can be adjusted by an enhanced Kalman-filter method to ensure successful reception.
摘要:
An apparatus and method for neighbor-aware concurrent transmission media access control (MAC) protocol is provided, which determines whether a plurality of communication connections may be established concurrently in a wireless network, where each node in the network obtains the topology information of its multi-hop neighbors via a neighbor discover module. A cross-layer observation module integrates the physical and virtual carrier sensing, observes the address field of a control frame of a MAC layer in the wireless network, and compares the address field information of the control frame against the topology information obtained by the neighbor discover module to determine whether a plurality of connections may be established for concurrent transmission.
摘要:
The invention provides a system that implements an algorithm for integrated link adaptation and power control to achieve specified error rates and to improve an overall throughput for real-time applications in wireless packet networks. The system initially divides wireless terminals into groups according to their signal path gains. Afterwards, the system can periodically adapt transmissions (i.e., link adaptations) based on the required error rates, actual error statistics and average transmission power for each wireless terminal group. Furthermore, transmission power can be adjusted by an enhanced Kalman-filter method to ensure successful reception.
摘要:
A method for performing an efficient handoff of a wireless endpoint to an access point in a wireless network environment includes measuring a number of stations utilizing the access point, selecting a broadcast count of the wireless endpoint according to the number of stations, selecting a retry count of the access point according to the number of stations, and performing the handoff of the wireless endpoint to the access point utilizing the selected broadcast count and retry count. The broadcast count corresponding to a number of probe request frames sent by the wireless endpoint to initiate the handoff of the wireless endpoint, and the retry count corresponding to a number of probe response frames sent by the access point to acknowledge receipt of the probe request frames.
摘要:
A cross-layer rate adaptation mechanism for wireless local area network (WLAN) can obtain the channel state by calculating the Eb/N0 ratio of ACK frame transmitted from the receiver side. The mechanism determines the transmission rate of the next frame by referring to a predefined reduced mode table. When receiving an ACK frame fails, the mechanism can automatically lower the transmitting rate of the next transmission. Therefore, the method can reduce the damage to the system when ACK frame failure happens.
摘要:
A location-based service system and method, which allows a location-based service server connected with a communication device and a cloud data server to perform registration authorization procedures and service authorization procedures using an international mobile subscriber identity of the communication device that cannot be easily modified or forged in the registration and service modes, so that a user may obtain a specific location-based service result via the communication device, and this distributed authentication technique reduces the risk of data theft while increasing the flexibility and convenience in obtaining services.
摘要:
The invention provides a system that implements an algorithm for integrated link adaptation and power control to achieve specified error rates and to improve an overall throughput for real-time applications in wireless packet networks. The system initially divides wireless terminals into groups according to their signal path gains. Afterwards, the system can periodically adapt transmissions (i.e., link adaptations) based on the required error rates, actual error statistics and average transmission power for each wireless terminal group. Furthermore, transmission power can be adjusted by an enhanced Kalman-filter method to ensure successful reception.
摘要:
A slide electronic device includes a first body, a second body, and a slide mechanism. The slide mechanism includes a first connecting member and a second connecting member. One end of the first connecting member is pivotally connected to the first body, an opposite end is pivotally connected to the second body, one end of the second connecting member is pivotally connected to the first body, and an opposite end is pivotally connected to the second body. A distance between rotary axes of the two ends of the first connecting member exceeds that of the second connecting member. When the second body slides relative to the first body, the first connecting member and the second connecting member are rotated relative to the first body and the second body until an end of the second body resists the first body and the second body is angled.