Bidirectional scheduling in low-power wide-area networks

Patent metadata

Field	Value
Publication number	US-11792853-B2
Application number	US-202117351025-A
Country	US
Kind code	B2
Filing date	Jun 17, 2021
Priority date	Dec 21, 2018
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

Embodiments provide a base station of an uncoordinated wireless communication system, wherein the communication system is configured to communicate in a radio band used by a plurality of communication systems, wherein the base station is configured to receive an uplink transmission from an end point of the wireless communication system, wherein the base station is configured to transmit, in response to the reception of the uplink transmission, a downlink transmission to the end point in a downlink transmission window, wherein the downlink transmission window is synchronized in time to the uplink transmission, wherein the base station is configured, in case of an expected collision of the downlink transmission with another transmission, to reposition the downlink transmission in time and/or frequency within the downlink transmission window, in order to avoid a collision of the downlink transmission with the other transmission.

First claim

The invention claimed is:

1. Base station of an uncoordinated wireless communication system,
wherein the communication system is configured to communicate in a radio band used by a plurality of communication systems,
wherein the base station is configured to receive an uplink transmission from an end point of the wireless communication system,
wherein the base station is configured to transmit, in response to the reception of the uplink transmission, a downlink transmission to the end point in a downlink transmission window, wherein the downlink transmission window is synchronized in time to the uplink transmission,
wherein the base station is configured, in case of an expected collision of the downlink transmission with another transmission, to reposition the downlink transmission in time and/or frequency within the downlink transmission window, in order to avoid a collision of the downlink transmission with the other transmission.

2. Base station according to claim 1 ,
wherein the downlink transmission window is synchronized in frequency to the uplink transmission.

3. Base station according to claim 1 ,
wherein the base station is configured to estimate a collision probability of the downlink transmission with another transmission, in order to determine whether a collision of the downlink transmission with another transmission is expected.

4. Base station according to claim 1 ,
wherein the base station is configured to acquire an information describing other planned transmissions of the communication system,
wherein the base station is configured to determine whether a collision of the downlink transmission with another transmission is expected based on the information describing planned transmissions of the communication system.

5. Base station according to claim 1 ,
wherein a length and/or bandwidth of the downlink transmission window considers transmission tolerances of the communication system,
wherein the transmission tolerances are frequency deviations, time deviations, multipath propagation, and/or doppler shift.

6. Base station according to claim 5 ,
wherein the base station is configured to reposition the downlink transmission in time and/or frequency within the downlink transmission window, thereby exploiting remaining transmission tolerances of the communication system.

7. Base station according to claim 1 ,
wherein the downlink transmission window comprises a plurality of downlink transmission sub-windows,
wherein the downlink transmission is a telegram splitting based downlink transmission that is transmitted non-concurrently in the plurality of downlink transmission sub-windows.

8. Base station according to claim 1 ,
wherein the downlink transmission comprises a plurality of sub-data packets that are transmitted non-concurrently in a plurality of downlink transmission sub-windows,
wherein the base station is configured to reposition at least a subset of the plurality of sub-data packets of the downlink transmission in time and/or frequency within the plurality of downlink transmission sub-windows, in order to avoid a collision of the downlink transmission with the other transmission.

9. Base station according to claim 8 ,
wherein the base station is configured to reposition the subset of the plurality of sub-data packets uniformly in time and/or frequency within the downlink transmission sub-windows.

10. Base station according to claim 8 ,
wherein the base station is configured to reposition the subset of the plurality of sub-data packets within the downlink transmission sub-windows according to an emulated doppler shift on the downlink transmission between the base station and the end point.

11. Base station according to claim 8 ,
wherein the base station is configured to reposition the plurality of sub-data packets within the downlink transmission sub-windows by applying time and/or frequency offsets to the plurality of sub-data packets or at least a subset of the plurality of sub-data packets.

12. Base station according to claim 8 ,
wherein the base station is configured to equalize the power of the transmissions of the plurality of sub-data packets.

13. Base station according to claim 12 ,
wherein the base station is configured to compensate a deviation in transmission power for different sub-data packets of the downlink transmission, caused by a different number of concurrent transmissions, by attenuating sub-data packet transmissions or parts of sub-data packet transmissions with a lower number of concurrent transmissions accordingly.

14. Base station according to claim 8 ,
wherein the base station is configured to re-allocate a second subset of the plurality of sub-data packets of the downlink transmission to other downlink transmission sub-windows and to indicate in a first subset of the plurality of sub-data packets the other downlink transmission sub-windows to which the second subset of the plurality of sub-data packets are re-allocated.

15. Base station according to claim 8 ,
wherein the base station is configured to re-allocate a second subset of the plurality of sub-data packets of the downlink transmission to other downlink transmission sub-windows, to align multiple transmissions for simultaneous transmission on different frequencies.

16. Base station according to claim 8 ,
wherein the plurality of sub-data packets are coded,
wherein the base station is configured to not transmit a sub-data packet or a part of a sub-data packet of the plurality of sub-data packets, in order to avoid a collision of the downlink transmission with the other transmission.

17. Base station according to claim 1 ,
wherein the base station is configured to queue downlink data to be transmitted in the downlink transmission.

18. Base station according to claim 17 ,
wherein the base station is configured to update or allow updating the queued downlink data based on uplink data received with the uplink transmission.

19. Base station according to claim 18 ,
wherein the base station is configured to transmit the previously queued downlink data in the downlink transmission, if a timing constraint cannot be met for the updated downlink data.

20. Base station according to claim 17 ,
wherein the base station is configured to select downlink data to be transmitted in the downlink transmission from the queued downlink data in dependence on an expected collision of the respective downlink transmission comprising the respective downlink data and another transmission.

21. Base station according to claim 1 ,
wherein the base station is configured to request a further downlink transmission window if a transmission of the downlink transmission in the downlink transmission window is not possible due to collisions, duty cycle constraints and/or channel conditions.

22. Base station according to claim 1 ,
wherein the base station is configured, in case of an expected collision of the downlink transmission with another transmission, to only transmit portions of the downlink transmission that positively correlate with the other transmission.

23. Method for operating a base station of an uncoordinated wireless communication system communicating in a radio band used by a plurality of communication systems, the method comprising:
receiving an uplink transmission from an end point of the wireless communication system,
transmitting, in response to the reception of the uplink transmission, a downlink transmission to the e

Assignees

• Fraunhofer Ges Forschung

Inventors

• Kilian Gerd
• Bernhard Josef
• Wechsler Johannes
• Kneissl Jakob
• Ereth Stefan
• Soller Dominik

Classifications

• H04W74/0816 Primary

  with collision avoidance · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title

• H04W74/08 Primary

  Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) · CPC title

• H04W84/18

  Self-organising networks, e.g. ad-hoc networks or sensor networks · CPC title

• Y02D30/70

  in wireless communication networks · CPC title