Systems and methods of performing power control of a physical channel in a communication system

Patent metadata

Field	Value
Publication number	US-10952158-B2
Application number	US-201716328808-A
Country	US
Kind code	B2
Filing date	Sep 26, 2017
Priority date	Sep 30, 2016
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

Systems and methods for performing power control of a physical channel in a communication system are provided. In one exemplary embodiment, a method in a wireless device of performing power control of a physical channel in a wireless communication system may include determining a transmission power for a transmission on the physical channel according to a power control loop. Further, the loop may specify the transmission power based on at least one parameter. Also, a value of the at least one parameter may be dependent on which of different transmission time interval (TTI) lengths defined as usable on the physical channel is selected for the transmission on the physical channel.

First claim

The invention claimed is:

1. A method of performing power control of a physical channel in a wireless communication system, the method comprising a wireless device:
determining a transmission power for a transmission on the physical channel according to a power control loop;
wherein the loop specifies the transmission power based on at least one parameter, with a value of the at least one parameter being dependent on which of different transmission time interval (TTI) lengths defined as usable on the physical channel is selected for the transmission on the physical channel.

2. The method of claim 1 , wherein the at least one parameter has a different value for each TTI length usable on the physical channel.

3. The method of claim 1 , wherein the value of the at least one parameter further depends on which of different transmission formats defined as usable on the physical channel is selected for the transmission on the physical channel.

4. The method of claim 3 , wherein the at least one parameter has a different value for each transmission format usable on the physical channel.

5. The method of claim 1 , wherein the value of the at least one parameter is based on a power adjustment for the transmission on the physical channel having the selected TTI length.

6. The method of claim 1 , wherein the value of the at least one parameter is based on a ratio of a power adjustment for the transmission on the physical channel having the selected TTI length and a power adjustment for the transmission on the physical channel having a predetermined TTI length.

7. The method of claim 1 , wherein the value of the at least one parameter is based on a number of symbols in the transmission on the physical channel having the selected TTI length.

8. The method of claim 1 , wherein the value of the at least one parameter is based on a ratio of a number of symbols in a transmission on the physical channel having the selected TTI length and a number of symbols in a transmission on the physical channel having a predetermined TTI length.

9. The method of claim 8 , wherein the ratio is represented as follows:

10
⁢

log
10

(

TTIsymbols
selected

TTIsymbols
predetermined

)

,

wherein TTIsymbols selected is the selected number of TTI symbols, and
TTIsymbols predetermined is the predetermined number of TTI symbols.

10. The method of claim 9 , wherein the ratio is further represented as follows:

a
⁢

⁢
10
⁢

log
10

(

TTIpilotsymbols
selected

TTIpilotsymbols
predetermined

)

+

b
⁢

⁢
10
⁢

log
10

(

TTIcontrolsymbols
selected

TTIcontrolsymbols
predetermined

)

;

wherein the selected number of TTI symbols corresponds to a selected number of pilot symbols (TTIpilotsymbols selected ) and a selected number of control symbols (TTIcontrolsymbols selected );
wherein the predetermined number of TTI symbols corresponds to a predetermined number of pilot symbols (TTIpilotsymbols predetermined ) and a predetermined number of control symbols (TTIcontrolsymbols predetermined ); and
wherein a and b are constants.

11. The method of claim 9 , wherein the selected number of TTI symbols corresponds to a short TTI having a length of less than 14 symbols and/or the predetermined number of TTI symbols is fourteen.

12. The method of claim 8 , wherein the ratio is represented as follows:

10
⁢

log
10

(

TTIlength
selected

TTIlength
predetermined

)

,

wherein TTIlength selected is the selected TTI length, and TTIlength predetermined is the predetermined TTI length.

13. The method of claim 12 , wherein the selected TTI length corresponds to a short TTI having a length of less than one millisecond and/or the predetermined TTI length is one millisecond.

14. The method of claim 8 , wherein the ratio is further represented as follows:

a
⁢

⁢
10
⁢

log
10

(

TTIpilotlength
selected

TTIpilotlength
predetermined

)

+

b
⁢

⁢
10
⁢

log
10

(

TTIcontrollength
selected

TTIcontrollength
predetermined

Assignees

• Ericsson Telefon Ab L M

Inventors

• Almquist Gustav
• Andersson Mattias
• Falconetti Laetitia
• Larsson Daniel

Classifications

• H04W52/18 Primary

  TPC being performed according to specific parameters · CPC title

• H04W52/0209 Primary

  in terminal devices · CPC title

• H04W52/08 Primary

  Closed loop power control · CPC title

• H04W52/06

  TPC algorithms · CPC title

• H04W52/325

  Power control of control or pilot channels · CPC title