Feedback control in an FDD TDD-CDMA system
View Patent ↗Active control feedback between a base station and user equipment in a wireless communications network is achieved by allocating a first time slot within a frame for a UE to transmit a beacon signal to the base station, where the beacon signal is separate from data signals in the frame, allocating a second time slot within the frame for the base station to transmit a control signal in response to the beacon signal, and allocating other timeslots for the base station to operate in full duplex FDD mode. The control signal provides a basis upon which the UE adjusts a transmission parameter, such as power.
1. A method for enabling active control feedback between a base station and user equipment (UE) in a wireless communications network, the method comprising:
allocating, by a controller, a first time slot within a frame for a UE to transmit a beacon signal to the base station, wherein the beacon signal is separate from data signals in the frame, and includes uplink physical channel information;
allocating, by the controller, a second time slot within the frame that is different to the first time slot for the base station to transmit a control signal in response to the beacon signal, the control signal for providing a basis upon which the UE adjusts a transmission parameter, wherein allocating the second time slot to the control signal comprises allocating the second time slot to the control signal using a first code of a code domain and allowing another downlink signal that is not the control signal to use a second code of the code domain to share the second time slot with the control signal, wherein the first code differs from the second code; and
allocating, by the controller, other timeslots for the base station to operate in full duplex frequency division duplex (FDD) mode.
2. The method of claim 1 , wherein data signals are not allocated to the first time slot.
3. The method of claim 1 , wherein the first and second time slots operate in full duplex FDD mode.
4. The method of claim 1 , wherein the transmission parameter comprises power.
5. The method of claim 1 , wherein the control signal is based upon at least one factor from a group consisting of: path loss computed based upon the received power of the beacon signal; time of arrival of the beacon signal; and channel impulse response in response to the beacon signal.
6. The method of claim 1 , wherein allocating a first time slot within a frame for the UE comprises allocating the first time slot within at least some successive frames to different UEs for transmission of respective different beacon signals, and allocating a second time slot within a frame for the base station comprises allocating the second time slot to the base station for transmission of different control signals within the at least some successive frames to the different UEs.
7. The method of claim 1 , further comprising;
determining, by the controller, to which UE the first time slot should be allocated based upon at least one factor from a group consisting of:
expected volume of data transfer expected;
required data transfer rate;
frequency of short bursts of data transfer;
total number of UEs connected to the network;
time since last data transfer; and
UE power saving requirements.
8. A controller for enabling active control feedback between a base station and UE in a wireless communications network, the controller comprising logic for:
allocating a first time slot within a frame for a UE to transmit a beacon signal to the base station, wherein the beacon signal is separate from data signals in the frame, and includes uplink physical channel information;
allocating a second time slot within the frame that is different to the first time slot for the base station to transmit a control signal in response to the beacon signal, the control signal for providing a basis upon which the DE adjusts a transmission parameter; wherein allocating the second time slot to the control signal comprises allocating the second time slot to the control signal using a first code of a code domain and allowing another downlink signal that is not the control signal to use a second code of the code domain to share the second time slot with the control signal, wherein the first code differs from the second code; and
allocating other timeslots for the base station to operate in full duplex frequency division duplex (FDD) mode.
9. The controller of claim 8 , wherein data signals are not allocated to the first time slot.
10. The controller of claim 8 , wherein the first and second time slots operate in full duplex FDD mode.
11. The controller of claim 8 , wherein the transmission parameter comprises power.
12. The controller of claim 8 , wherein the control signal is based upon at least one factor from the group consisting of: path loss computed based upon the received power of the beacon signal; time of arrival of the beacon signal; and channel impulse response in response to the beacon signal.
13. The controller of claim 8 , wherein
the logic for allocating a first time slot within a frame for the UE comprises logic for allocating the first time slot within at least some successive frames to different UEs for transmission of respective different beacon signals, and
the logic for allocating a second time slot within a frame for the base station comprises logic for allocating the second time slot to the base station for transmission of different control signals within the at least some successive frames to the different UEs.
14. The controller of claim 8 , further comprising logic for determining to which UE the first time slot should be allocated based upon at least one factor from the group consisting of: expected volume of data transfer expected; required data transfer rate; frequency of short bursts of data transfer; total number of UEs connected to the network; time since last data transfer; and UE power saving requirements.
15. A computer-readable storage medium comprising program code, executable by a processor, for enabling active control feedback between a base station and UE in a wireless communications network, the program code for:
allocating a first time slot within a frame for a UE to transmit a beacon signal to the base station, wherein the beacon signal is separate from data signals in the frame, and includes uplink physical channel information;
allocating a second time slot within the frame that is different to the first time slot for the base station to transmit a control signal in response to the beacon signal, the control signal for providing a basis upon which the UE adjusts a transmission parameter; wherein allocating the second time slot to the control signal comprises allocating the second time slot to the control signal using a first code of a code domain and allowing another downlink signal that is not the control signal to use a second code of the code domain to share the second time slot with the control signal, wherein the first code differs from the second code; and
allocating other timeslots for the base station to operate in full duplex frequency division duplex (FDD) mode.
16. The computer-readable storage medium of claim 15 , wherein data signals are not allocated to the first time slot.
17. The computer-readable storage medium of claim 15 , wherein the first and second time slots operate in full duplex FDD mode.
18. The computer-readable storage medium of claim 15 , wherein the transmission parameter comprises power.
19. The computer-readable storage medium of claim 15 , wherein the control signal is based upon at least one factor from the group consisting of: path loss computed based upon the received power of the beacon signal; time of arrival of the beacon signal; and channel impulse response in response to the beacon signal.
20. The computer-readable storage medium of claim 15 , wherein the program code for allocating a first time slot within a frame for the UE comprises program code for allocating the first time slot within at least some successive frames to different UEs for transmission of respective different beacon signals, and the program code for allocating a second time slot within a frame for the base station comprises program code for allocating the second time slot to the base station for transmission of different control signals within the at least some successive frames to the different UEs.
21. The computer-readable storage medium of claim 15 , further comprising program code for determining to which UE the first time slot should be allocated based upon at least one factor from the group consisting of: expected volume of data transfer expected; required data transfer rate; frequency of short bursts of data transfer; total number of UEs connected to the network; time since last data transfer; and UE power saving requirements.