Narrowband internet of things random access channel configuration design

Patent metadata

Field	Value
Publication number	US-12069743-B2
Application number	US-202217585129-A
Country	US
Kind code	B2
Filing date	Jan 26, 2022
Priority date	Mar 16, 2016
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

According to one aspect of the disclosure, a wireless device is configured to transmit a random access preamble. The wireless device includes processing circuitry. The processing circuitry is configured to obtain a tone index, and determine a location within a frequency band for transmitting the random access preamble based on the obtained tone index.

First claim

What is claimed is:

1. A method for a wireless device for transmitting a random access preamble, the method comprising:
receiving system information configuring a plurality of narrowband physical random access channel, NPRACH, bands, each NPRACH band corresponding to one coverage class of a plurality of coverage classes, for each of the configured NPRACH bands, three bits in the system information indicate a tone index corresponding to a starting subcarrier of that NPRACH band, the tone index being based on a number of tones per NPRACH band, system bandwidth, and a number of random access channel bands;
determining a coverage class of the plurality of coverage classes based on a parameter associated with the network node and the wireless device;
selecting one NPRACH band of the plurality of NPRACH bands based on the determined coverage class; and
transmitting the random access preamble on a location within a frequency band, the random access preamble corresponding to a frequency hopping random access preamble over the selected NPRACH band, the location being based on the tone index of the selected NPRACH band.

2. The method of claim 1 , wherein the system information is received via radio resource control, RRC, signaling.

3. The method of claim 2 , wherein the tone index ranges from 0 to 36.

4. The method of claim 2 , further comprising obtaining at least a configuration index indicating at least one subframe at which the transmission of the random access preamble is to start.

5. The method of claim 2 , wherein the frequency band has a bandwidth of 180 KHz.

6. The method of claim 1 , wherein the tone index ranges from 0 to 36.

7. The method of claim 1 , further comprising obtaining at least a configuration index indicating at least one subframe at which the transmission of the random access preamble is to start.

8. The method of claim 1 , wherein the frequency band has a bandwidth of 180 KHz.

9. A wireless device configured to transmit a random access preamble, the wireless device comprising:
processing circuitry, the processing circuitry configured to:
receive system information configuring a plurality of narrowband physical random access channel, NPRACH, bands, each NPRACH band corresponding to one coverage class of a plurality of coverage classes, for each of the configured NPRACH bands, three bits in the system information indicate a tone index corresponding to a starting subcarrier of that NPRACH band, the tone index being based on a number of tones per NPRACH band, system bandwidth, and a number of random access channel bands;
determine a coverage class of the plurality of coverage classes based on a parameter associated with the network node and the wireless device;
select one NPRACH band of the plurality of NPRACH bands based on the determined coverage class; and
cause a transmission of the random access preamble on a location within a frequency band, the random access preamble corresponding to a frequency hopping random access preamble over the selected NPRACH band, the location being based on the tone index of the selected NPRACH band.

10. The wireless device of claim 9 , wherein the system information is received via radio resource control, RRC, signaling.

11. The wireless device of claim 9 , wherein the tone index ranges from 0 to 36.

12. The wireless device of claim 9 , wherein the processing circuitry is further configured to obtain at least a configuration index indicating at least one subframe at which the transmission of the random access preamble is to start.

13. The wireless device of claim 9 , wherein the frequency band has a bandwidth of 180 KHz.

14. A method for a network node for receiving a random access preamble from a wireless device, the method comprising:
transmitting system information to the wireless device, the system information configuring a plurality of narrowband physical random access channel, NPRACH, bands, each NPRACH band corresponding to one coverage class of a plurality of coverage classes, for each of the configured NPRACH bands, three bits in the system information indicate a tone index corresponding to a starting subcarrier of that NPRACH band, the tone index being based on a number of tones per NPRACH band, system bandwidth, and a number of random access channel bands; and
receiving the random access preamble on a location within a frequency band, the random access preamble corresponding to a frequency hopping random access preamble over the selected NPRACH band, the location being based on the tone index of one of the NPRACH bands selected based on a coverage class of a plurality of coverage classes of the wireless device, the coverage class being based on a parameter associated with the network node and the wireless device.

15. A network node configured to receive a random access preamble from a wireless device, the network node comprising:
processing circuitry, the processing circuitry configured to:
cause transmission of system information to the wireless device, the system information configuring a plurality of narrowband physical random access channel, NPRACH, bands, each NPRACH band corresponding to one coverage class of a plurality of coverage classes, for each of the configured NPRACH bands, three bits in the system information indicate a tone index corresponding to a starting subcarrier of that NPRACH band, the tone index being based on a number of tones per NPRACH band, system bandwidth, and a number of random access channel bands; and
receive the random access preamble on a location within a frequency band, the random access preamble corresponding to a frequency hopping random access preamble over the selected NPRACH band, the location being based on the tone index of one of the NPRACH bands selected based on a coverage class of a plurality of coverage classes of the wireless device, the coverage class being based on a parameter associated with the network node and the wireless device.

Assignees

• Ericsson Telefon Ab L M

Inventors

• Lin Xingqin
• Adhikary Ansuman
• Bergman Johan
• Blankenship Yufei
• Grövlen Asbjörn
• Shokri Razaghi Hazhir
• Sui Yutao
• Wang Yi-Pin Eric

Classifications

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title

• H04L5/0012 Primary

  Hopping in multicarrier systems · CPC title

• H04W72/0453

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

• H04L27/2607

  Cyclic extensions · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title