USE OF FREQUENCY OFFSET INFORMATION FOR WIRELESS NETWORKS

• US 20170373907A1
• Filed: 06/23/2017
• Published: 12/28/2017
• Est. Priority Date: 06/27/2016
• Status: Abandoned Application

• Current Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Original Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Inventors: TAN, Jun, DA, Ren
• Application Number:
  US15/632,100
• Publication Number:
  US 20170373907A1
• Time in Patent Office: Days
• CPC Class Codes: H04L 2027/002 using feedback from a remote receiver
• CPC Class Codes: H04L 2027/0095 in a preamble or similar structure
• CPC Class Codes: H04L 27/0014 Carrier regulation of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2673 characterised by synchronisation parameters
• CPC Class Codes: H04L 27/2675 Pilot or known symbols
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 56/0035 detecting errors in frequency or phase

Abstract

A technique includes receiving, by a user device from a base station in a wireless network, a frequency offset information (FOI), adjusting, by the user device, an uplink transmit frequency based on the frequency offset information, and transmitting, by the user device, at least one of data and control information to the base station based on the adjusted uplink transmit frequency.

Claims

1. A method comprising:

receiving, by a user device from a base station in a wireless network, a frequency offset information (FOI);

adjusting, by the user device, an uplink transmit frequency based on the frequency offset information; and

transmitting, by the user device, at least one of data and control information to the base station based on the adjusted uplink transmit frequency.

2. The method of claim 1 wherein the frequency offset information indicates at least one of the following:

a frequency difference, as measured by the base station, as a difference in a frequency of a signal transmitted by the user device and an expected frequency; and

a frequency adjustment that should be performed for an uplink transmit frequency for the user device to correct an uplink transmit frequency of the user device.

3. The method of claim 2 wherein the frequency difference comprises a difference in a frequency of a random access preamble transmitted by the user device, and an expected frequency for the random access preamble.

4. The method of claim 1, wherein the receiving a frequency offset information comprises:

receiving, by the user device from the base station, a random access response including at least the frequency offset information.

5. The method of claim 1, wherein the receiving a frequency offset information comprises:

transmitting, by the user device to the base station, a random access preamble;

receiving, by the user device from the base station, a random access response including at least a timing advance information and the frequency offset information.

6. The method of claim 2 wherein the frequency difference comprises a difference in a frequency of an uplink demodulation reference signals received via a narrowband physical uplink shared (NPUSCH) channel and a nominal or expected frequency of the uplink demodulation reference signals.

7. The method of claim 1, wherein the receiving a frequency offset information comprises:

receiving, by the user device from the base station via a physical downlink control channel, a downlink control information (DCI) that includes at least the frequency offset information.

8. The method of claim 7:

wherein the receiving comprises receiving, by a narrow band-Internet of Things (NB-IoT) user device from a base station in a wireless network, a frequency offset information;

wherein the adjusting comprises adjusting, by the NB-IoT user device, an uplink transmit frequency based on the frequency offset information; and

wherein the transmitting comprises transmitting, by the NB-IoT user device, at least one of data and control information to the base station based on the adjusted uplink transmit frequency.

9. The method of claim 1 wherein the user device comprises an Internet of Things (IoT) user device.

10. The method of claim 1 wherein the user device comprises a narrowband-Internet of Things (NB-IoT) user device.

11. A computer program product, the computer program product comprising a computer-readable storage medium and storing executable code that, when executed by at least one data processing apparatus, is configured to cause the at least one data processing apparatus to perform a method claim 1.

12. An apparatus comprising at least one processor and at least one memory including computer instructions, when executed by the at least one processor, cause the apparatus to:

receive, by a user device from a base station in a wireless network, a frequency offset information (FOI);

adjust, by the user device, an uplink transmit frequency based on the frequency offset information; and

transmit, by the user device, at least one of data and control information to the base station based on the adjusted uplink transmit frequency.

13. A method, comprising:

determining, by a base station for a user device in a wireless network, a frequency offset information (FOI);

transmitting, by the base station to the user device, the frequency offset information; and

receiving, by the base station, an uplink transmission from the user device in which an uplink transmit frequency has been adjusted based on the frequency offset information.

14. The method of claim 13 wherein the determining comprises:

receiving, by the base station, a random access channel preamble from the user device; and

determining the frequency offset information based on the received random access channel preamble.

15. The method of claim 14 wherein the determining a frequency offset information based on the received random access channel preamble comprises:

determining the frequency offset information by correlating or cross-correlating the received random access channel preamble against an expected preamble to determine the frequency offset information for the user device.

16. The method of claim 13 wherein the frequency offset information indicates at least one of the following:

a frequency difference, as measured by the base station, as a difference in a frequency of a signal transmitted by the user device, and an expected frequency; and

a frequency adjustment that should be performed for a transmit frequency for the user device to correct the transmit frequency of the user device.

17. The method of claim 13 wherein the frequency offset information is based on a difference in a frequency of a random access preamble received by the base station from the user device, and an expected frequency for the random access preamble.

18. The method of claim 13, wherein the transmitting a frequency offset information comprises at least one of the following:

transmitting, by the base station to the user device, a random access response including at least the frequency offset information; and

transmitting, by the base station to the user device a downlink control information (DCI) that includes at least the frequency offset information.

19. The method of claim 16 wherein the frequency difference comprises a difference in a frequency of an uplink demodulation reference signals received via a narrowband physical uplink shared (NPUSCH) channel and a nominal or expected frequency of the uplink demodulation reference signals.

20. An apparatus comprising at least one processor and at least one memory including computer instructions, when executed by the at least one processor, cause the apparatus to perform the method of claim 13.