Arrangement and method for simulating a radio access network
The present invention relates to a reverberation chamber (RC) comprising at least one antenna head attached at a first side of the chamber and a stirrer adapted to rotate. The RC comprises an arrangement to enable UE antennas to be placed at a location within the RC such that the stirrer is adapted to rotate to simulate a fading condition for the UE antennas in relation to the antenna heads attached at the first side and that RF connections from the antenna heads arc adapted to be connected to a cellular network, such as a closed cellular network.
1. A reverberation chamber (RC) comprising:
at least one antenna head attached at a first side of the reverberation chamber, each antenna head, of the at least one antenna head, including a Radio Frequency (RF) connection;
a stirrer;
an area to accommodate User equipment (UE) antennas; and
a shield inside the reverberation chamber between the at least one antenna head and the UE antennas, the shield having RF-reflecting surfaces configured to prevent line of sight transmission between the at least one antenna head and the UE antennas,
wherein the stirrer is configured to rotate to scatter RF signals to create a fading condition for the UE antennas in relation to the at least one antenna head attached at the first side, and
wherein the RF connection, from each antenna head of the at least one antenna head, is to connect to a cellular network.
2. The RC according to claim 1 , where the fading condition is Rayleigh fading.
3. The RC according to claim 1 , where the area further enables User Equipment (UEs), to which the respective UE antennas are connected, to be placed within the RC.
4. The RC according to claim 1 , where the area further enables User Equipment (UEs), to which the respective UE antennas are connected, to be placed outside the RC.
5. The RC according to claim 1 , further comprising: a climate control system to control the temperature within the RC.
6. The RC according to claim 1 , where the area accommodates 12-20 User Equipment (UEs).
7. The RC according to claim 1 , where the area accommodates 50-120 User Equipment (UEs).
8. The RC according to claim 1 , where the cellular network is a closed cellular network.
9. The RC according to claim 1 , where each RF connection, from each antenna head of the at least one antenna head, is to be connected to the cellular network via a radio base station.
10. A method for simulating a radio environment, the method comprising:
inserting at least one User Equipment (UE) antenna into a reverberation chamber, the reverberation chamber including a stirrer adapted to rotate and at least one antenna head attached at a first side of the chamber and a shield inside the reverberation chamber between the at least one antenna head and the at least one UE antenna, wherein the shield has RF-reflecting surfaces configured to prevent line of sight transmission between the at least one antenna head and the at least one UE antenna, the stirrer being located between the at least one UE antenna and the at least one antenna head, and RF connections from the at least one antenna head connect to a cellular network;
establishing a radio connection between the at least one UE antenna and the at least one antenna head; and
simulating a fading condition by rotating the stirrer.
11. The RC according to claim 1 , wherein the RF-reflecting surfaces of the shield are further configured to prevent line of sight transmission between the at least one antenna head and the stirrer.
12. The method according to claim 10 , further comprising preventing line of sight transmission by the RF-reflective surfaces of the shield between the at least one antenna head and the stirrer.