Random access power control

Patent metadata

Field	Value
Publication number	US-11228990-B2
Application number	US-202016828244-A
Country	US
Kind code	B2
Filing date	Mar 24, 2020
Priority date	Mar 28, 2019
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

A wireless device transmits a first preamble via a first sub-band. The wireless device determines to perform a first preamble retransmission based on receiving no response to the first preamble. The wireless device selects, for the first preamble retransmission, a second sub-band. Based on the second sub-band being different from the first sub-band, the wireless device determines that a transmission power of the first preamble retransmission may be based on a same value of a power ramping counter used for transmitting the first preamble. The wireless device transmits, based on the transmission power, a second preamble for the first preamble retransmission via the second sub-band.

First claim

What is claimed is:

1. A method comprising:
transmitting, by a wireless device, a first preamble via a first sub-band;
determining to perform a first preamble retransmission based on receiving no response to the first preamble;
selecting, for the first preamble retransmission, a second sub-band;
based on the second sub-band being different from the first sub-band, determining that a transmission power of the first preamble retransmission is based on a same value of a power ramping counter used for transmitting the first preamble; and
transmitting, based on the transmission power, a second preamble for the first preamble retransmission via the second sub-band.

2. The method of claim 1 , wherein the first sub-band and the second sub-band are configured in an unlicensed cell.

3. The method of claim 1 , wherein the first sub-band is configured in a first bandwidth part of a cell, and the second sub-band is configured in a second bandwidth part of the cell.

4. The method of claim 1 , wherein the first sub-band and the second sub-band are configured in a third bandwidth part of a cell.

5. The method of claim 1 , further comprising incrementing, based on the receiving no response, a preamble transmission counter.

6. The method of claim 1 , wherein the selecting, for the first preamble retransmission, the second sub-band is based on a listen-before-talk indicating the second sub-band being idle.

7. The method of claim 1 , further comprising:
selecting a first downlink reference signal for transmitting the first preamble; and
based on determining to perform the first preamble retransmission, selecting a second downlink reference signal for transmitting the second preamble.

8. The method of claim 7 , wherein the determining that the transmission power of the first preamble retransmission is based on the same value of a power ramping counter is further based on the first downlink reference signal and the second downlink reference signal being the same.

9. The method of claim 1 , further comprising:
determining to perform a second preamble retransmission based on receiving no response to the second preamble;
selecting, for a second preamble retransmission, the second sub-band;
based on the selecting the second sub-band, incrementing the power ramping counter; and
transmitting, using a second transmission power determined based on the power ramping counter, a third preamble via the second sub-band.

10. The method of claim 9 , wherein the incrementing the power ramping counter is further based on a same downlink reference signal being used for the first preamble retransmission and being used for the second preamble retransmission.

11. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
transmit a first preamble via a first sub-band;
determine to perform a first preamble retransmission based on receiving no response to the first preamble;
select, for the first preamble retransmission, a second sub-band different from the first sub-band;
based on the selection of the second sub-band, determine that a transmission power of the first preamble retransmission is based on a same value of a power ramping counter used for transmitting the first preamble; and
transmit, based on the transmission power, a second preamble for the first preamble retransmission via the second sub-band.

12. The wireless device of claim 11 , wherein the first sub-band and the second sub-band are configured in an unlicensed cell.

13. The wireless device of claim 11 , wherein the first sub-band is configured in a first bandwidth part of a cell, and the second sub-band is configured in a second bandwidth part of the cell.

14. The wireless device of claim 11 , wherein the first sub-band and the second sub-band are configured in a third bandwidth part of a cell.

15. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to increment, based on the receiving no response, a preamble transmission counter.

16. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
select a first downlink reference signal for transmitting the first preamble; and
based on the determination to perform the first preamble retransmission, select a second downlink reference signal for transmitting the second preamble.

17. The wireless device of claim 16 , wherein the determination that the transmission power of the first preamble retransmission is based on the same value of a power ramping counter is further based on the first downlink reference signal and the second downlink reference signal being the same.

18. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
determine to perform a second preamble retransmission based on receiving no response to the second preamble;
select, for a second preamble retransmission, the second sub-band;
based on the selection of the second sub-band, increment the power ramping counter; and
transmit, using a second transmission power determined based on the power ramping counter, a third preamble via the second sub-band.

19. The wireless device of claim 18 , wherein the incrementing the power ramping counter is further based on a same downlink reference signal being used for the first preamble retransmission and being used for the second preamble retransmission.

20. A system comprising:
a base station; and
a wireless device comprising:
one or more first processors; and
first memory storing first instructions that, when executed by the one or more first processors, cause the wireless device to:
transmit, to the base station, a first preamble via a first sub-band;
determine to perform a first preamble retransmission based on receiving no response to the first preamble;
select, for the first preamble retransmission, a second sub-band different from the first sub-band;
based on the selection of the second sub-band, determine that a transmission power of the first preamble retransmission is based on a same value of a power ramping counter used for transmitting the first preamble; and
transmit, based on the transmission power, a second preamble for the first preamble retransmission via the second sub-band.

Assignees

• Ofinno Llc

Inventors

• Jeon Hyoungsuk
• Dinan Esmael Hejazi
• Hui Bing
• Yi Yunjung
• Zhou Hua
• Park Kyungmin

Classifications

• H04W52/146

  Uplink power control · CPC title

• H04B17/327

  Received signal code power [RSCP] · CPC title

• H04W52/16

  Deriving transmission power values from another channel · CPC title

• H04W52/362

  Aspects of the step size · CPC title

• H04W52/48 Primary

  during retransmission after error or non-acknowledgment · CPC title