Method and arrangement in a communication system

A first user terminal comprising a system for providing location information associated with the first user terminal to a second user terminal, the first user terminal and the second user terminal are comprised within a wireless communication system, the wireless communication system further comprising a plurality of radio base stations of which a first one of the plurality of radio base stations is serving the first user terminal, the system comprising:

• a receiving unit configured to receive a signal from one of the plurality of radio base stations, comprising absolute geographical coordinates corresponding to the location of the one of the plurality of radio base stations;
• a measurement unit configured to perform pilot signal measurements on the received signal;
• a determination unit configured to determine the absolute geographical coordinates corresponding to the location of the first user terminal, based on the performed pilot signal measurements and the received absolute geographical coordinates of the one of the plurality of radio base stations;
• and
• a transmitting unit configured to transmit the determined absolute geographical coordinates to the second user terminal.

A method of operating a first one of a plurality of radio base stations for providing location information associated with a first user terminal, to a second user terminal, the first user terminal and the second user terminal are comprised within a wireless communication system, the wireless communication network further comprising the plurality of radio base stations of which a second one of the plurality of radio base stations is serving the second user terminal, the method comprising:

• obtaining absolute geographical coordinates corresponding to a location of at least one of the plurality of radio base stations;
• receiving pilot signal measurements from the first user terminal, the pilot signal measurements being made on a signal broadcasted from at least one of the plurality of radio base stations;
• computing relative coordinates of the first user terminal, the relative coordinates comprising cell ID and geometry values based on the received pilot signal measurements made on a signal broadcasted from each respective one of the plurality of radio base stations;
• sending the computed relative coordinates of the first user terminal to at least one of the first user terminal, the second user terminal and/or the second one of the plurality of radio base stations.

A first radio base station comprising a system for serving a first user terminal in providing location information associated with a first user terminal, to a second user terminal, the first user terminal and the second user terminal are comprised within a wireless communication system, the wireless communication network further comprising the plurality of radio base stations, of which a second one of the plurality of radio base stations is serving the second user terminal, the system comprising arrangement:

• an obtaining unit configured to obtain absolute geographical coordinates corresponding to a location of at least one of the plurality of radio base stations;
• a receiving unit configured to receive pilot signal measurements from the first user terminal, the pilot signal measurements being made on a signal broadcasted from at least one of the plurality of radio base stations;
• a computing unit configured to compute relative coordinates of the first user terminal, the relative coordinates comprising cell ID and geometry values based on the received pilot signal measurements made on a signal broadcasted from each respective one of the plurality of radio base stations;
• and
• a sending unit configured to send the computed relative coordinates of the first user terminal to at least one of the first user terminal, the second user terminal and/or the second one of the plurality of radio base stations.

A method of operating a second user terminal, for receiving location information associated with a first user terminal, the first user terminal and the second user terminal are comprised within a wireless communication system, the wireless communication system further comprising a plurality of radio base stations of which a second one of the plurality of radio base stations is serving the second user terminal, the method comprising:

• receiving location information comprising absolute geographical coordinates of the first user terminal;
• sending the received absolute geographical coordinates of the first user terminal to the second one of the plurality of radio base stations, in a request for converting the received absolute geographical coordinates of the first user terminal into relative coordinates comprising a cell ID and geometry values;
• and
• receiving the relative coordinates of the first user terminal comprising cell ID and geometry values from the second radio base station.

A second user terminal, comprising a system for receiving location information associated with a first user terminal, the first user terminal and the second user terminal are comprised within a wireless communication system, the wireless communication system further comprising a plurality of radio base stations of which a second one of the plurality of radio base stations is serving the second user terminal, the system comprising:

• a receiving unit configured to receive location information comprising absolute geographical coordinates of the first user terminal;
• a sending unit configured to send the received absolute geographical coordinates of the first user terminal to the second one of the plurality of radio base stations, in a request for converting the received absolute geographical coordinates of the first user terminal into relative coordinates comprising a cell ID and geometry values;
• and
• wherein the receiving unit is further configured to receive the relative coordinates of the first user terminal comprising cell ID and geometry values from the second radio base station.

A method of operating a second one of a plurality of radio base stations, for serving a second user terminal in receiving location information associated with a first user terminal, the first user terminal and the second user terminal are comprised within a wireless communication system, the wireless communication system further comprises the plurality of radio base stations of which a first one of the plurality of radio base stations is serving the first user terminal, the method comprising:

• receiving absolute geographical coordinates of the first user terminal;
• converting the received absolute geographical coordinates of the first user terminal into relative coordinates of the first user terminal comprising cell ID and geometry values by using a mapping table;
• and
• sending the relative coordinates of the first user terminal comprising the cell ID and the geometry values to the second user terminal.

A second radio base station comprising a system for serving a second user terminal in receiving location information associated with a first user terminal, the first user terminal and the second user terminal are comprised within a wireless communication system, the wireless communication system further comprises the plurality of radio base stations of which a first one of the plurality of radio base stations is serving the first user terminal, the system comprising:

• a receiving unit configured to receive absolute geographical coordinates of the first user terminal;
• a converting unit configured to convert the received absolute geographical coordinates of the first user terminal into relative coordinates of the first user terminal comprising cell ID and geometry values by using a mapping table;
• and
• a sending unit configured to send the relative coordinates of the first user terminal comprising the cell ID and the geometry values to the second user terminal.