| 摘要 |
The invention relates to a method for estimating the geographical distance or for estimating a range of the geographical distance between at least two user equipments by means of transmitting at least one discovery message for device to device communication from a first user equipment to at least one second user equipment, the first user equipment and the second user equipment being enabled to use a device to device communication mode (D2D mode) including proximity detection and/or discovery, wherein the method comprises the following steps: - - in a first step, the discovery message is generated by the first user equipment, wherein the discovery message comprises a transmission power information, the transmission power information being indicative of the level of the transmission power used by the first user equipment for transmitting the discovery message, - - in a second step, the discovery message is transmitted, by the first user equipment, using a common air interface of the first user equipment and the second user equipment, wherein the level of transmission power is used by the first user equipment to transmit the discovery message, - - in a third step, the discovery message, comprising the transmission power information, is received by the second user equipment, and a level of reception power is determined, wherein based on the received transmission power information and the determined level of reception power, an estimation related to - - the geographical distance, or to - - a range of the geographical distance out of a plurality of different ranges of the geographical distance between the first user equipment and the second user equipment is determined by the second user equipment. |
