Base station

About: Base station is a research topic. Over the lifetime, 85883 publications have been published within this topic receiving 1019303 citations. The topic is also known as: Mobile phone base stations & BS.

Overhead electric power line fault real-time monitoring system

Abstract: The present utility model relates to an overhead electric power line fault real-time monitoring system. The system comprises a wireless type electric power line fault indication sensor, a single mode base station, a dual mode base station, and a monitoring center. The wireless type electric power line fault indication sensor is provided with a first RF transmit-receive module, the single mode base station is provided with a second RF transmit-receive module, and the dual mode base station is provided with a third RF transmit-receive module and a GSM transmit-receive module. The wireless type electric power line fault indication sensor is respectively connected with the single mode base station and the dual mode base station in a data transmission way, the single mode base station is connected with the dual mode base station in a data transmission way, the GSM transmit-receive module is connected with an operator communication center in a data transmission way, and the operator communication center is connected with the monitoring center in a data transmission way. By adopting the system, the working state of the electric power line can be monitored in real time, fault positions can be accurately and rapidly determined, and the generated communication costs are cheap.

Base-station tracking in mobile communications using a switched parasitic antenna array

Abstract: Base-station tracking in mobile communications benefits from a directional antenna and so requires direction finding technology. A novel technique for electronically directing the radiation pattern of an antenna array employs a directional array with only one active element and three parasitic elements operating near resonance. Three different methods of direction finding are assessed; a coarse angular location method, a precise angular location method assuming one incident beam, and a precise angular location method with multiple incident beams. An array with n elements, if used in conjunction with a relatively simple controller, can be used to resolve n-1 signals. This technology can be implemented using both wire and patch antenna-array elements and either linear or circular polarization can be used, lending the technology to applications in both terrestrial and satellite communications systems.

Base station apparatus and radio communication method

Abstract: A base station (10) performs bidirectional radio communication with a terminal station apparatus by using a time division communication frame consisting of a first region having a predetermined open loop cycle and a second region having an open loop cycle shorter than the first region. A level detection block (21) detects a reception level of an uplink slot arranged in the second region. A transmission diversity block (14) diversity-transmits a downlink transmission signal allocated to a downlink slot corresponding to the aforementioned uplink slot in accordance with the detection result of the reception level. Thus, it is possible to enhance the improvement effect of the reception quality by the transmission diversity without lowering the transmission efficiency.

Evolutionary multiobjective optimization for base station transmitter placement with frequency assignment

Abstract: We propose a new solution to the problem of positioning base station transmitters of a mobile phone network and assigning frequencies to the transmitters, both in an optimal way. Since an exact solution cannot be expected to run in polynomial time for all interesting versions of this problem (they are all NP-hard), our algorithm follows a heuristic approach based on the evolutionary paradigm. For this evolution to be efficient, i.e., goal-oriented and sufficiently random at the same time, problem-specific knowledge is embedded in the operators. The problem requires both the minimization of the cost and of the channel interference. We examine and compare two standard multiobjective techniques and a new algorithm - the steady-state evolutionary algorithm with Pareto tournaments. One major finding of the empirical investigation is a strong influence of the choice of the multiobjective selection method on the utility of the problem-specific recombination leading to a significant difference in the solution quality.

Dynamic user registration method in a mobile communications network

Abstract: In a communications system comprising a number of base stations, each base station communicating over a shared communication channel with a plurality of registered stations and controlling the network cell formed by said plurality of registered stations, a method is described for dynamically registering and deregistering mobile stations. Each station owns a unique address and is allocated a local identifier at registration time. Each network cell owns a unique cell identifier known to all registered stations belonging to this network cell. Base stations manage cell members data uniquely associating the unique address and the local identifier corresponding to each one of the mobile stations belonging to their network cell. A registration request is sent to a selected base station by a registering mobile station, comprising the unique cell identifier of the network cell controlled by the selected base station and the unique address of the registering mobile station; the selected base station detects in its cell members data any conflicting registered station whose unique address matches the unique address of the registering mobile station and sends an address check packet to any conflicting registered station, comprising the unique address of the conflicting registered station, its local identifier and the identifier of the network cell it controls. A receiving registered mobile station sends to the selected base station, an acknowledgement to the address check packet if its unique address, the local identifier of its owning base station and its network cell identifier all match with the ones carried by the address check packet. The selected base station rejects the registration request it it receives an acknowledgement to its address check packet. The same address check packet is used to deregister inactive stations.