Mobile telecommunications system transmission and reception points and methods for switching transmission and reception points between active and inactive states
A mobile telecommunications system transmission and reception point has circuitry configured to receive a status indicator, and to switch between an active state and an inactive state in response to the received status indicator.
1. A mobile telecommunications system method for a transmission and reception point serving a user equipment, comprising:
obtaining, by the transmission and reception point, a speed related parameter of the served user equipment;
transmitting an activation command and the speed related parameter of the served user equipment to at least one neighboring transmission and reception point; and
compensating, at least at one of the transmission and reception point and the at least one neighboring transmission and reception point, for a Doppler effect in a wireless link communication from the transmission and reception point to the served user equipment, based on the obtained speed related parameter,
wherein compensating for the Doppler effect in the wireless link communication includes compensating a subset of frequency resources of the wireless link communication for a positive Doppler effect and compensating another subset of frequency resources of the wireless link communication for a negative Doppler effect.
2. The mobile telecommunications system method of claim 1 , wherein the speed related parameter is indicative of a Doppler effect.
3. The mobile telecommunications system method of claim 1 , wherein the speed related parameter is indicative of a maximum speed of the user equipment.
4. The mobile telecommunications system method of claim 3 , wherein the maximum speed is the maximum speed between a transmission and reception point and the served user equipment.
5. The mobile telecommunications system method of claim 3 , wherein the speed related parameter is an indicator of an average Doppler frequency shift.
6. The mobile telecommunications system method of claim 3 , further comprising determining a current speed of the served user equipment.
7. The mobile telecommunications system method of claim 6 , wherein the compensation is further based on the current speed.
8. The mobile telecommunications system method of claim 6 , wherein the current speed is determined based on a measurement performed by the user equipment.
9. The mobile telecommunications system method of claim 1 , wherein the transmission and reception point is configured to communicate in a forward and backward direction along a movement direction of the served user equipment.
10. The mobile telecommunications system method of claim 1 , wherein the transmission and reception point is configured to communicate in one direction along a movement direction of the served user equipment.
11. The mobile telecommunications system method of claim 1 , wherein a first user equipment is located at a first section of a vehicle and a second user equipment is located at a second section of the vehicle, wherein the first section and the second section are distant from each other.
12. The mobile telecommunications system method of claim 8 , wherein the measurement performed by the user equipment is a measurement based on global positioning (GPS) data.
13. The mobile telecommunications system method of claim 8 , wherein the measurement performed by the user equipment is performed on received signals transmitted from the transmission and reception point.
14. The mobile telecommunications system method of claim 7 , wherein the compensation is further based on whether the current speed is increasing or decreasing.
15. The mobile telecommunications system method of claim 14 , wherein the wireless link communication is compensated using a maximum Doppler frequency shift when the current speed is increasing, and the wireless link communication is compensated using an average Doppler frequency shift when the current speed is decreasing.
16. The mobile telecommunications system method of claim 1 , wherein compensating for the Doppler effect in the wireless link communication includes offsetting a frequency of the wireless link communication by an offset value determined based on the speed related parameter.
17. The mobile telecommunications system method of claim 16 , wherein the offset value is updated upon receipt of additional speed related parameters from the user equipment.
18. The mobile telecommunications system method of claim 1 , wherein compensating for the Doppler effect in the wireless link communication includes accounting for an angle between a direction of travel of the user equipment and a relative direction between the user equipment and the transmission and reception point.
19. The mobile telecommunications system method of claim 11 , wherein the vehicle is a train.
20. The mobile telecommunications system method of claim 19 , wherein the user equipment travels along a predetermined fixed path according to tracks upon which the train travels.