Mitigation of inter-carrier interference (ICI) due to frequency domain multiplexed (FDMED) DL channels with mixed numerologies

Patent metadata

Field	Value
Publication number	US-11997049-B2
Application number	US-202017436521-A
Country	US
Kind code	B2
Filing date	Mar 9, 2020
Priority date	Mar 7, 2019
Publication date	May 28, 2024
Grant date	May 28, 2024

Abstract

Techniques are provided for mitigating inter-carrier interference (ICI) due to frequency multiplexed downlink channels with mixed numerologies. For example, a base station allocates, for a user equipment (UE), a first downlink (DL) channel and a second DL channel that are frequency multiplexed in a same bandwidth part (BWP) and have different channel numerologies The base station determines a guard band interval between the first DL channel and the second DL channel based on one or more characteristics of the different channel numerologies, transmits DL transmissions to the UE, over the first DL channel and the second DL channel, using the guard band interval between the first DL channel and the second DL channel.

First claim

What is claimed is:

1. A method of operating a base station (BS), comprising:
allocating, for a user equipment (UE), a first downlink (DL) channel and a second DL channel that are frequency multiplexed in a same bandwidth part (BWP) and have different channel numerologies;
determining a guard band interval between the first DL channel and the second DL channel based on one or more characteristics of the different channel numerologies by:
comparing a first sampling rate of the first DL channel to a second sampling rate of the second DL channel to determine a difference between the first sampling rate and the second sampling rate; and
assigning the guard band interval based on the difference; and

transmitting DL transmissions to the UE, over the first DL channel and the second DL channel, using the guard band interval between the first DL channel and the second DL channel.

2. The method of claim 1 , wherein the first DL channel is a measurement channel and the second DL channel is a shared data channel.

3. The method of claim 1 , wherein the first DL channel is a signal synchronization block (SSB) channel and the second DL channel is one of a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH).

4. The method of claim 1 , wherein the one or more characteristics of the different channel numerologies include: subcarrier spacing (SCS), sampling rate, or power offset.

5. The method of claim 1 , wherein the determining comprises:
comparing a first subcarrier spacing of the first DL channel to a second subcarrier spacing of the second DL channel to determine a difference between the first subcarrier spacing and the second subcarrier spacing; and
assigning the guard band interval based on the difference.

6. The method of claim 5 , wherein the difference is represented as a ratio, and wherein the guard band interval increases as the ratio increases.

7. The method of claim 1 , wherein the difference is represented as a ratio, and wherein the guard band interval increases as the ratio increases.

8. The method of claim 1 , wherein the determining further comprises:
comparing a first transmit power of the first DL channel to a second transmit power of the second DL channel to determine a power offset between the first transmit power and the second transmit power; and
assigning the guard band interval based on the power offset.

9. The method of claim 8 , wherein the power offset is represented as a ratio, and wherein the guard band interval increases as the ratio increases.

10. A base station, comprising:
radio front end circuitry configured to perform wireless communication over a wireless network;
processor circuitry, coupled to the radio front end circuitry, configured to:
assign, for a user equipment (UE), a first subcarrier spacing (SCS) for a first downlink (DL) channel and a second SCS for a second DL channel, where the second DL channel is frequency multiplexed in a same bandwidth part (BWP) with first DL channel;
assign, for the user equipment (UE), a first sampling rate for first DL channel and a second sampling rate for the second DL channel;
determine a guard band interval between the first DL channel and the second DL channel based on at least partially on a difference between the first SCS and the second SCS and based at least partially on a difference between the first sampling rate and the second sampling rate; and
transmit, using the radio front end circuitry, DL transmissions to the UE, over the first DL channel and the second DL channel, using the guard band interval between the first DL channel and the second DL channel.

11. The base station of claim 10 , wherein the first DL channel is a measurement channel and the second DL channel is a shared data channel.

12. The base station of claim 10 , wherein the first DL channel is a signal synchronization block (SSB) channel and the second DL channel is one of a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH).

13. The base station of claim 10 , wherein the processor circuitry is further configured to:
assign, for the user equipment (UE), a first DL transmit power for the first DL channel and a second DL transmit power for the second DL channel; and
determine the guard band interval based at least partially on a difference between the first transmit power and the second transmit power.

14. A base station, comprising:
radio front end circuitry configured to perform wireless communication over a wireless network;
processor circuitry, coupled to the radio front end circuitry, configured to:
allocate, for a user equipment (UE), a first downlink (DL) channel and a second DL channel that are frequency multiplexed in a same bandwidth part (BWP) and have different channel numerologies;
determine a guard band interval between the first DL channel and the second DL channel based on one or more characteristics of the different channel numerologies by:
comparing a first sampling rate of the first DL channel to a second sampling rate of the second DL channel to determine a difference between the first sampling rate and the second sampling rate; and
assigning the guard band interval based on the difference; and

transmit, using the radio front end circuitry, DL transmissions to the UE, over the first DL channel and the second DL channel, using the guard band interval between the first DL channel and the second DL channel.

15. The base station of claim 14 , wherein the first DL channel is a measurement channel and the second DL channel is a shared data channel.

16. The base station of claim 14 , wherein the first DL channel is a signal synchronization block (SSB) channel and the second DL channel is one of a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH).

17. The base station of claim 14 , wherein the one or more characteristics of the different channel numerologies include: subcarrier spacing (SCS), sampling rate, or power offset.

18. The base station of claim 14 , wherein to determine the guard band interval, the processor circuitry is further configured to:
compare a first subcarrier spacing of the first DL channel to a second subcarrier spacing of the second DL channel to determine a difference between the first subcarrier spacing and the second subcarrier spacing; and
assign the guard band interval based on the difference.

19. The base station of claim 18 , wherein the difference is represented as a ratio, and wherein the guard band interval increases as the ratio increases.

20. The base station of claim 14 , wherein to determine the guard band interval, the processor circuitry is further configured to:
compare a first transmit power of the first DL channel to a second transmit power of the second DL channel to determine a power offset between the first transmit power and the second transmit power; and
assign the guard band interval based on the power offset.

Assignees

• Apple Inc

Inventors

• Yu Zhibin
• Huang Rui
• Cui Jie
• Tang Yang
• Li Hua

Classifications

• H04L5/0092 Primary

  Indication of how the channel is divided · CPC title

• H04L5/0082

  at predetermined intervals · CPC title

• H04L27/26025

  Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003) · CPC title

• H04L27/2607

  Cyclic extensions · CPC title

• H04W72/0453 Primary

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title