3 results about "Path loss" patented technology

The invention discloses a method and device for controlling uplink power. The method comprises the steps of: calculating downlink path loss of a mobile station in a service cell; calculating path loss of the mobile station to an adjacent cell; calculating path compensating transmitting power of the mobile station according to the downlink path loss of the mobile station in the service cell and the path loss of the mobile station to the adjacent cell; and obtaining basic open loop transmitting power of the mobile station according to the path compensating transmitting power of the mobile station. According to the technical scheme provided by the invention, the system frequency spectrum efficiency and the cell edge user frequency spectrum efficiency can be simply and effectively combined.

The invention discloses a method for electromagnetic simulation of different error maps with a ray tracing algorithm, which mainly solves the problem of the undefined influence degree of different types of map error factors in geometric environmental information on an existing ray tracing model predicting result. The method is implemented by the following steps: (1) obtaining a required digital map corresponding to the outdoor micro-area environment; (2) respectively generating a plurality of building top offset error maps and wall translation error maps on the basis of the obtained map; (3) performing radio wave propagation simulation prediction on the original digital map and the error maps by adopting a ray tracing model, so as to obtain a mean value and a root-mean-square value of path losses of the top offset error maps and the wall translation error maps as well as the original digital map at each test point. According to the method, the influence degree of the different types of error factors in the geometric information on the precision of the ray tracing predicting result can be analyzed through the mean value and the root-mean-square value which are obtained through simulation, and reference is provided for radio wave propagation and channel prediction in an outdoor micro-area scene.

The invention discloses a method and device for indicating a terminal to adjust the transmitting power in group call paging. The method comprises the steps of: sending a group call paging message to a terminal in a cell for many times, so that trunking paging is established, and monitoring a dedicated group call response uplink shared channel corresponding to the trunking paging, wherein the initial transmitting power and/or a path loss factor can be configured in the group call paging message; and the dedicated group call response uplink shared channel is used for sending a feedback signal to a base station by a terminal interested in a group call; and, according to the strength of the feedback signal monitored on the dedicated group call response uplink shared channel, adjusting the initial transmitting power and/or the path loss factor configured in the group call paging message. By means of the scheme, the problem that correct analysis of messages in the feedback signal by the base station is not conducive due to the facts that the terminal replies messages having same contents by using same physical resources on the dedicated group call response uplink shared channel and the distribution number of terminals in various cells has a big difference can be solved.