Self-optimizing network entity for a telecommunications system

• US 10,045,306 B2
• Filed: 02/19/2015
• Issued: 08/07/2018
• Est. Priority Date: 02/21/2014
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Inventors: Tarlazzi, Luigi, D'Souza, Maurice
• Primary Examiner(s): Dean, Raymond
• Application Number:
  US15/120,275
• Publication Number:
  US 20170064642A1
• Time in Patent Office: 1,265 Days
• CPC Class Codes: H04B 17/19 Self-testing arrangements
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/248 where transmission power control commands are generated based on a path parameter
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

Certain features relate to systems and methods for optimizing the radio frequency characteristics of signals transmitted between a radio base station (RBS) and a distributed antenna system (DAS). A self-optimizing network (SON) entity can determine adjustments to radio frequency operations and management parameters at the RBS based on radio frequency parameters measured by a measurement and configuration module at the DAS. Adjustments to radio frequency operations and management parameters can include adjustments configured to compensate for signal latency caused by the DAS. Adjustments to radio frequency operations and management parameters can also include adjustments to signal gain due to noise rise caused by the DAS. The SON entity can also measure nominal receive power levels for the RBS for purposes of open loop power control.

Claims

1. A method, comprising:

measuring radio frequency parameters of radio frequency communications between a head-end unit and a remote unit of a distributed antenna system (DAS);

sending measurements of the radio frequency parameters to a self-optimizing network (SON) entity, where the SON entity comprises a first operations and management application programming interface (API) and a second operations and management API;

determining, by the SON entity, adjustments to operations and management parameters of a radio base station (RBS) using the measurements of the radio frequency parameters; and

sending commands to the RBS for changing the operations and management parameters of the RBS using the adjustments determined by the SON entity.

2. The method of claim 1, wherein the radio frequency parameters include an uplink DAS gain, a downlink DAS gain, and an uplink DAS noise power,

wherein the adjustments to the operations and management parameters include an updated value for changing an uplink RBS gain.

3. The method of claim 2, wherein the updated value for the uplink RBS gain is determined by calculating an uplink DAS noise rise and summing the uplink DAS noise rise with a difference between the uplink DAS gain and the downlink DAS gain.

4. The method of claim 1, wherein the radio frequency parameters include a signal delay caused by the DAS,

wherein the adjustments to the operations and management parameters include an updated value for a compensation for the signal delay caused by the DAS.

5. The method of claim 1, wherein the adjustments to the operations and management parameters include an updated value for changing a nominal receive power level of the RBS.

6. The method of claim 1, further comprising:

providing downlink wireless communications from the RBS to one or more remote units of the DAS; and

providing uplink wireless communications from the one or more remote units to the RBS.

7. The method of claim 1, wherein the adjustments to the operations and management parameters are further determined using one or more key performance indicators that include a maximum uplink noise floor level at the RBS.

8. A self-optimizing network (SON) entity, comprising:

a first operations and management application programming interface (API) configured to receive measurements of radio frequency parameters from a head-end unit of a distributed antenna system (DAS), wherein the SON entity is configured to determine adjustments to operations and management parameters of a radio base station (RBS) using measurements of the radio frequency parameters; and

a second operations and management API configured to send commands to the RBS for changing the operations and management parameters of the RBS using the adjustments determined by the SON entity.

9. The SON entity of claim 8, wherein the radio frequency parameters include an uplink DAS gain, a downlink DAS gain, and an uplink DAS noise power,

wherein the adjustments to the operations and management parameters include an updated value for changing an uplink RBS gain.

10. The SON entity of claim 9, wherein the updated value for the uplink RBS gain is determined by calculating an uplink DAS noise rise and summing the uplink DAS noise rise with a difference between the uplink DAS gain and the downlink DAS gain.

11. The SON entity of claim 8, wherein the radio frequency parameters include a signal delay caused by the DAS,

wherein the adjustments to the operations and management parameters include an updated value for a compensation for the signal delay caused by the DAS.

12. The SON entity of claim 8, wherein the adjustments to the operations and management parameters include an updated value for changing a nominal receive power level of the RBS.

13. The SON entity of claim 8, wherein the head-end unit of the DAS is configured to provide downlink wireless communications from the RBS to one or more remote units of the DAS, and wherein the head-end unit is configured to provide uplink wireless communications from the one or more remote units to the RBS.

14. The SON entity of claim 8, wherein the first operations and management API is further configured to receive additional measurements of additional radio frequency parameters from the RBS, wherein the SON entity is further configured to determine additional adjustments to additional operations and management parameters of the head-end unit using the additional measurements of the radio frequency parameters, and wherein the second operations and management API is configured to send commands to the head-end unit for changing the additional operations and management parameters of the head-end unit using the additional adjustments determined by the SON entity.

15. A telecommunications system, comprising:

one or more remote units of a distributed antenna system (DAS);

a head-end unit of the DAS, the head-end unit being configured to measure radio frequency parameters of the DAS, and to provide wireless communications to the one or more remote units of the DAS;

a self-optimizing network (SON) entity communicatively coupled to the head-end unit, wherein the SON entity comprises a first operations and management application programming interface (API) configured to receive measurements of the radio frequency parameters measured by the head-end unit, and a second operations and management API configured to send commands to a radio base station (RBS) for changing operations and management parameters of the RBS using the determined adjustments; and

wherein the SON entity is configured to determine adjustments to the operations and management parameters of the RBS using the measurements of the radio frequency parameters.

16. The telecommunications system of claim 15, wherein the radio frequency parameters include an uplink DAS gain, a downlink DAS gain, and an uplink DAS noise power,

wherein the adjustments to the operations and management parameters include an updated value for changing an uplink RBS gain.

17. The telecommunications system of claim 16, wherein the updated value for the uplink RBS gain is determined by calculating an uplink DAS noise rise and summing the uplink DAS noise rise with a difference between the uplink DAS gain and the downlink DAS gain.

18. The telecommunications system of claim 15, wherein the radio frequency parameters include a signal delay caused by the DAS,

wherein the adjustments to the operations and management parameters include an updated value for a compensation for the signal delay caused by the DAS.

19. The telecommunications system of claim 15, wherein the adjustments to the operations and management parameters include an updated value for changing a nominal receive power level of the RBS.

20. The telecommunications system of claim 15, wherein the adjustments to the operations and management parameters are further based on one or more key performance indicators that include a maximum uplink noise floor level at the RBS.