Unlicensed carrier power control method, device, and storage medium

• US 10,091,744 B2
• Filed: 10/08/2015
• Issued: 10/02/2018
• Est. Priority Date: 02/04/2015
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Zhao, Yajun, Xu, Hanqing, Mo, Linmei
• Primary Examiner(s): Rachedine, Mohammed
• Application Number:
  US15/548,651
• Publication Number:
  US 20180007644A1
• Time in Patent Office: 1,090 Days
• Field of Search: None
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/06 TPC algorithms
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

An unlicensed carrier power control method is provided. Multiple transmitted power constraint parameters are acquired, and a minimum value in the multiple transmitted power constraint parameters is determined. Power control is performed according to the minimum value in the multiple transmitted power constraint parameters. An unlicensed carrier power control device and a storage medium are also provided.

Claims

1. An unlicensed carrier power control method, comprising:

acquiring multiple transmitted power constraint parameters, and determining a minimum value in the multiple transmitted power constraint parameters; and

performing power control according to the minimum value in the multiple transmitted power constraint parameters;

wherein, in a scenario of open loop power control, when the multiple transmitted power constraint parameters comprise transmitted power of a reference data channel and maximum transmitted power not considering an unlicensed carrier spectrum threshold, User Equipment (UE) obtains P_UN1 according to P_UN1=P_{init_pc}+β

(E_th−

E₀), where P_UN1 is the transmitted power of the reference data channel in the scenario of open loop power control, β

is a weighting coefficient, E_th is a preset unlicensed carrier availability judgment energy strength threshold value, E₀ is signal strength, measured at an unlicensed carrier, of a neighbor node, and P_{init_pc} is initial transmitted power not considering the unlicensed carrier spectrum threshold;

wherein, in a scenario of open loop power control, when the multiple transmitted power constraint parameters comprise transmitted power of a reference data channel and maximum transmitted power not considering an unlicensed carrier spectrum threshold, a base station obtains P_{UN1_BS} according to P<sub>UN1—

BS</sub>=P<sub>init—

BS</sub>+β

(E_th−

E₀), where P_{UN1_BS} is the transmitted power of the reference data channel in the scenario of open loop power control, β

is a weighting coefficient, E_th is a preset unlicensed carrier availability judgment energy strength threshold value, E₀ is signal strength, measured at an unlicensed carrier, of a neighbor node, and P_{init_BS} is initial transmitted power not considering the unlicensed carrier spectrum threshold;

wherein, in a scenario of closed loop power control, when the multiple transmitted power constraint parameters comprise transmitted power of a reference data channel and maximum transmitted power not considering an unlicensed carrier spectrum threshold, the UE obtains P_UN2 according to P_UN2=P_pc+β

(E_th−

E₀), where P_UN2 is the transmitted power of the reference data channel in the scenario of closed loop power control, β

is a weighting coefficient, E_th is a preset unlicensed carrier availability judgment energy strength threshold value, P_pc is the actual transmitted power not considering the unlicensed carrier spectrum threshold, and E₀ is signal strength, measured at an unlicensed carrier, of a neighbor node;

wherein, in a scenario of closed loop power control, when the multiple transmitted power constraint parameters comprise transmitted power of a reference data channel and maximum transmitted power not considering an unlicensed carrier spectrum threshold, the base station obtains P_{UN2_BS} according to P_{UN2_BS}=P_{pc_BS}+β

(E_th−

E₀), where P_{UN2_BS} is the transmitted power of the reference data channel in the scenario of closed loop power control, β

is a weighting coefficient, E_th is a preset unlicensed carrier availability judgment energy strength threshold value, P_{pc_BS} is actual transmitted power not considering the unlicensed carrier spectrum threshold, and E₀ is signal strength, measured at an unlicensed carrier, of a neighbor node.

2. The method as claimed in claim 1, wherein performing power control according to the minimum value in the multiple transmitted power constraint parameters comprises:

setting current transmitted power to be a difference value between the minimum value and a preset power offset according to the minimum value in the multiple transmitted power constraint parameters.

3. The method as claimed in claim 1, wherein, for a small-bandwidth channel or signal, performing power control according to the minimum value in the multiple transmitted power constraint parameters comprises:

setting transmitted power of the small-bandwidth channel or signal to be P₂=P_min−

10 lg(W_i/W₀)−

Δ

P′

, where P_min is the minimum value in the multiple transmitted power constraint parameters, W_i is a bandwidth of the small-bandwidth channel or a channel bandwidth occupied by the small-bandwidth signal, W₀ is a bandwidth of a reference data channel, and Δ

P′

is a preset power regulation offset;

wherein an act of executing power control according to the minimum value in the multiple transmitted power constraint parameters is performed by User Equipment (UE).

4. The method as claimed in claim 1, wherein, for a small-bandwidth channel or signal, performing power control according to the minimum value in the multiple transmitted power constraint parameters comprises:

setting transmitted power of the small-bandwidth channel or signal to be P′

₂=P′

_min−

10 lg(W_i/W₀)−

Δ

P′

, where P′

_min is the minimum value in the multiple transmitted power constraint parameters, W_i is a bandwidth of the small-bandwidth channel or a channel bandwidth occupied by the small-bandwidth signal, W₀ is a bandwidth of a reference data channel, and Δ

P′

is a preset power regulation offset; and

wherein an act of executing power control according to the minimum value in the multiple transmitted power constraint parameters is performed by a base station.

5. The method as claimed in claim 1, wherein, for a reservation signal, performing power control according to the minimum value in the multiple transmitted power constraint parameters comprises:

setting transmitted power of the reservation signal to be a sum of a preset power increment and a difference value between the minimum value and a preset power offset.

6. The method as claimed in claim 1, further comprising:

reporting, by User Equipment (UE), Power Headroom Report (PHR) to a base station, wherein PHR=P′

_max−

P_UE, where P′

_max is maximum transmitted power considering an unlicensed carrier spectrum threshold, and P_UE is current transmitted power of the UE.

7. The method as claimed in claim 1, further comprising:

acquiring corresponding unlicensed carrier availability judgment energy strength threshold values adopted when multiple signals or channels of different frequency-domain sparsity occupy an unlicensed carrier, and determining frequency-domain sparse signals or channels which are able to be borne by the unlicensed carrier according to signal strength of a neighbor node and the corresponding unlicensed carrier availability judgment energy strength threshold values adopted when multiple signals or channels of different frequency-domain sparsity occupy the unlicensed carrier.

8. A non-volatile computer storage medium, in which a computer-executable instruction is stored, the computer-executable instruction being configured to execute the unlicensed carrier power control method as claimed in claim 1.

9. An unlicensed carrier power control device, comprising:

a hardware processor, configured to perform programming modules stored in a memory, wherein the programming modules comprise;

an acquisition module and a control module, wherein

the acquisition module is configured to acquire multiple transmitted power constraint parameters, and determine a minimum value in the multiple transmitted power constraint parameters; and

the control module is configured to perform power control according to the minimum value in the multiple transmitted power constraint parameters;

wherein, in a scenario of open loop power control, when the multiple transmitted power constraint parameters comprise transmitted power of a reference data channel and maximum transmitted power not considering an unlicensed carrier spectrum threshold, User Equipment (UE) obtains P_UN1 according to P_UN1=P_{init_pc}+β

(E_th−

E₀), where P_UN1 is the transmitted power of the reference data channel in the scenario of open loop power control, β

is a weighting coefficient, E_th is a preset unlicensed carrier availability judgment energy strength threshold value, E₀ is signal strength, measured at an unlicensed carrier, of a neighbor node, and P_{init_pc} is initial transmitted power not considering the unlicensed carrier spectrum threshold;

wherein, in a scenario of open loop power control, when the multiple transmitted power constraint parameters comprise transmitted power of a reference data channel and maximum transmitted power not considering an unlicensed carrier spectrum threshold, a base station obtains P_{UN1_BS} according to P_{UN1_BS}+β

(E_th−

E₀), where P_{UN1_BS} is the transmitted power of the reference data channel in the scenario of open loop power control, β

is a weighting coefficient, E_th is a preset unlicensed carrier availability judgment energy strength threshold value, E₀ is signal strength, measured at an unlicensed carrier, of a neighbor node, and P_{init_BS} is initial transmitted power not considering the unlicensed carrier spectrum threshold;

wherein, in a scenario of closed loop power control, when the multiple transmitted power constraint parameters comprise transmitted power of a reference data channel and maximum transmitted power not considering an unlicensed carrier spectrum threshold, the UE obtains P_UN2 according to P_UN2=P_pc+β

(E_th−

E₀) where P_UN2 is the transmitted power of the reference data channel in the scenario of closed loop power control, β

is a weighting coefficient, E_th is a preset unlicensed carrier availability judgment energy strength threshold value, P_pc is the actual transmitted power not considering the unlicensed carrier spectrum threshold, and E₀ is signal strength, measured at an unlicensed carrier, of a neighbor node;

wherein, in a scenario of closed loop power control, when the multiple transmitted power constraint parameters comprise transmitted power of a reference data channel and maximum transmitted power not considering an unlicensed carrier spectrum threshold, the base station obtains P_{UN2_BS} according to P<sub>UN2_BS=Ppc_BS+β

(Eth</sub>−

E₀),where P_{UN2_BS} is the transmitted power of the reference data channel in the scenario of closed loop power control, β

is a weighting coefficient, E_th is a preset unlicensed carrier availability judgment energy strength threshold value, P_{pc_BS} is actual transmitted power not considering the unlicensed carrier spectrum threshold, and E₀ is signal strength, measured at an unlicensed carrier, of a neighbor node.

10. The device as claimed in claim 9, wherein, for a small-bandwidth channel or signal, the control module is configured to set transmitted power of the small-bandwidth channel or signal to be

P₂=P_min−

10 lg(W_i/W₀)−

Δ

P′

, where P_min is the minimum value in the multiple transmitted power constraint parameters, W_i is a bandwidth of the small-bandwidth channel or a channel bandwidth occupied by the small-bandwidth signal, W₀ is a bandwidth of a reference data channel, and Δ

P′

is a preset power regulation offset; and

the control module is located on User Equipment (UE).

11. The device as claimed in claim 9, wherein, for a small-bandwidth channel or signal, the control module is configured to set transmitted power of the small-bandwidth channel or signal to be

P′

₂=P′

_min−

10 lg(W_i/W₀)−

Δ

P′

, where P′

_min is the minimum value in the multiple transmitted power constraint parameters, W_i is a bandwidth of the small-bandwidth channel or a channel bandwidth occupied by the small-bandwidth signal, W₀ is a bandwidth of a reference data channel, and Δ

P′

is a preset power regulation offset; and

the control module is located on a base station.

12. The device as claimed in claim 9, wherein, for a reservation signal, the control module is further configured to set transmitted power of the reservation signal to be a sum of a preset power increment and a difference value between the minimum value and a preset power offset.