| 摘要 |
A server may detect a threshold number of mobile stations (e.g., total mobile stations or mobile stations belonging to a predefined group) currently located at an area, such as by determining that a number of mobile stations currently located at an area is greater than a desired maximum number of mobile stations or less than a desired minimum number of mobile stations. The threshold number may be determined based on a typical number of mobile stations located at the area. In response to detecting the threshold number of mobile stations, the server may obtain data recorded by surveillance equipment located at the area (including data recorded by mobile stations temporarily acting as surveillance equipment,) which data represents activity at the area. To obtain the data, the server may instruct the surveillance equipment to begin recording data. The server may then output the received data for receipt by a user.
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