WO2014180148A1

WO2014180148A1 - Method and system for detecting output power of dual mode rru device

Info

Publication number: WO2014180148A1
Application number: PCT/CN2013/090262
Authority: WO
Inventors: 李丁一; 周应学
Original assignee: 大唐移动通信设备有限公司
Priority date: 2013-05-10
Filing date: 2013-12-23
Publication date: 2014-11-13
Also published as: CN103281139B; CN103281139A

Abstract

Disclosed is a method for detecting the output power of a dual mode Remote Radio Unit (RRU) device, the method includes the steps: according to the cell carrier and power condition of the existing Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) and Time Division Long Term Evolution (TD-LTE), selecting a dual mode training sequence in the output power detection mode, the dual mode training sequence is the same as the cell frequency feature (S210); in the next predetermined period, according to the TD-LTE time slot, sending the dual mode training sequence in the coincided time period of the protection time slot of TD-SCDMA and the protection time slot of TD-LTE in the time axis and sampling data and calculating the accumulative sum (S220) and repeating the step for multiple times; converting, according to correspondence, the accumulative sum obtained by multiple data sampling into a power value, and calculating the feedback average power (S230); and calculating the output power according to the feedback average power (S240). The present invention enables the output power to be detected accurately and completely when the RRU device works in two modes of TD-SCDMA and TD-LTE simultaneously.

Description

Dual-mode RRU device output power detection method and system

The present invention relates to the field of communications technologies, and in particular, to a dual-mode RRU device output power detection method and system.

Background technique

The radio remote unit (RRU) is a remote device that can detect the quality of the device's transmit channel by detecting the RRU output power, and can provide the management station query by detecting the RRU output power of the RRU device. The device power low alarm is reported when an abnormality occurs.

In the existing implementation, the RRU devices work in time division synchronous code division multiple access (Time)

The Division-Synchronous Code Division Multiple Access (TD-SCDMA) and Time Division Long Term Evolution (TD-LTE) systems have their own RRU output power detection implementation methods.

The RRU output power detection method when the RRU device works in TD-SCDMA is a method for detecting a Downlink Pilot Time Slot (DW) signal of a cell. In hardware design, the power of the transmitting link is fed back using a direct feedback link in the power amplifier, and the feedback data is sent to the data processing module through the feedback link of the digital motherboard. The hardware design of this output power feedback acquisition is widely used in various detection methods. The following is a brief description of the output power feedback. In the software design, the specific process is as follows:

1) Set multiple RF switches to output power detection mode. This step is briefly referred to as a feedback switch.

2) After receiving the detection trigger, according to the 5ms period, the time slot is counted at a certain time in the DW time slot and the accumulated sum of the data is calculated. The ring slot is part of a special subframe in the TD-SCDMA slot structure.

3) After receiving the test stop, stop the number. 4) Convert the result of multiple acquisitions into a power value according to the corresponding relationship, and calculate the average value of the feedback power. This step is described later in order to calculate the feedback average power.

5) According to the link gain of each part of the feedback link, the feedback power average is substituted into the feedback power-output power calculation formula, and the corresponding output power of the specified feedback power at the specified temperature is calculated. This step is briefly described later as calculating the output power.

The RRU output power detection implementation method when the RRU device works in TD-LTE is a method for detecting the TD-LTE training sequence signal. In hardware design, the output power feedback method is adopted. In the software design, the specific process is as follows:

1) Set the feedback switch.

2) After receiving the detection trigger, the time slot is in the protection slot (Guard in the next 10ms period)

At some point in the Period, GP), the TD-LTE training sequence is sent and the sum is calculated. The GP time slot is part of a special subframe in the TD-LTE slot structure.

3) Repeat 2) steps multiple times.

4) Calculate the feedback average power.

5) Calculate the output power.

Since the signals transmitted by the cells of the two systems are different, the RRU device cannot accurately and completely detect the output power when working in both the TD-SCDMA and TD-LTE modes. Summary of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is: How to accurately and completely detect the output power of the RRU when the RRU device works in both TD-SCDMA and TD-LTE modes.

(2) Technical plan

To solve the above technical problem, the present invention provides a dual-mode RRU device output power detection method, including the steps:

According to the current TD-SCDMA and TD-LTE cell carriers in the output power detection mode and The power situation selects a dual mode training sequence with the same cell frequency characteristics;

Transmitting the dual-mode training sequence and calculating the accumulated sum in a time period in which the guard time slot of the TD-SCDMA and the guard time slot of the TD-LTE overlap on the time axis according to the TD-LTE time slot in the next predetermined period, Repeat this step multiple times;

The accumulated sum of the multiple acquisition numbers is converted into a power value according to the corresponding relationship, and the feedback average power is calculated; and the output power is calculated according to the feedback average power.

The step of calculating the output power according to the feedback average power specifically includes: substituting the feedback power average into the feedback average power-output power calculation formula, and calculating the output power corresponding to the specified feedback power at the specified temperature.

The predetermined period is 10 ms.

The present invention also provides a dual-mode RRU device output power detection system, comprising: a training sequence selection module, configured to select a cell frequency according to a current cell carrier and power condition of a current TD-SCDMA and TD-LTE in an output power detection mode The same dual mode training sequence 歹' J;

a training sequence transmitting module for pressing the TD-LTE time slot in the next predetermined period

The guard time slot of the TD-SCDMA and the guard time slot of the TD-LTE transmit the dual-mode training sequence in a time period coincident on the time axis, and calculate the accumulated sum by the number of times, and repeat the step a plurality of times;

An average power calculation module, configured to convert the cumulative sum of multiple acquisitions into a power value according to a corresponding relationship, and calculate a feedback average power;

And an output power calculation module, configured to calculate an output power according to the feedback average power.

The output power calculation module is specifically configured to substitute a feedback power average into a feedback average power-output power calculation formula, and calculate a corresponding output power of the specified feedback power at the specified temperature.

The predetermined period is 10 ms.

(3) beneficial effects

The present invention transmits a dual-mode training sequence and counts the accumulated sum by a TD-LTE time slot at a time when the GP time slot of the TD-SCDMA and the GP time slot of the TD-LTE overlap on the time axis. To detect the output power of the RRU, the RRU device can accurately and completely detect the output power when working in both TD-SCDMA and TD-LTE modes. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments or the description of the prior art will be briefly described below, and obviously, the attached in the following description The drawings are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

1 is a schematic structural diagram of an output power detection circuit of an RRU device;

2 is a flowchart of a method for detecting output power of a dual-mode RRU device according to an embodiment of the present invention; and FIG. 3 is a schematic structural diagram of an output power detection system for a dual-mode RRU device according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly described in conjunction with the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are Some embodiments, rather than all of the embodiments, are invented. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The specific embodiments of the present invention are further described in detail below with reference to the drawings and embodiments. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

FIG. 1 is a schematic structural diagram of an RRU device output power detecting circuit used in the dual-mode RRU device output power detecting method according to the present invention. The output signal is sent by the digital processing chip FPGA, after the digital-to-analog converter (DAC), the local oscillator modulator, the digital board filter, the digital board transmitter amplifier, the amplifier PA amplifier, the power amplifier circulator, the circulator in the amplifier The coupling circuit sends the signal to the power amplifier coupling feedback link, and then the signal is directly reversed by SWITCH2 before entering the digital motherboard. The feedback link and the power amplifier coupled feedback link select the motherboard feedback link and the power amplifier coupled feedback link connection, the signal is passed through the mixer on the digital motherboard, the data board receives the amplifier, the analog-to-digital converter DC), and the ADC passes the mode. After the number conversion, the digital feedback signal is sent to the digital processing chip FPGA.

The flow of the dual-mode RRU device output power detection method of the device based on FIG. 1 of the present invention is shown in FIG. 2, and includes:

Step S210: In the output power detection mode, select a dual-mode training sequence with the same cell frequency characteristics according to the current cell carrier and power conditions of the TD-SCDMA and the TD-LTE. In this embodiment, the selected process is actually a process of simulation calculation. By understanding the current cell parameters, a dual-mode training sequence that can compare the cell signals is simulated.

The reason for using the dual-mode training sequence is that the actual signal of the dual-mode cell itself cannot be detected due to the dual-mode time-domain superposition effect, and the dual-mode training sequence contains the complete information of the cell, and the dual-mode cell signal is simulated as much as possible, so The number of carriers, the frequency point determines the type of sequence, and the size of the sequence is determined according to the power level of the cell. The selection of such a dual mode training sequence is an alternative method of inferring the condition of the cell signal by detecting a signal similar to the cell signal.

Step S220, in the next predetermined period (eg: 10ms), according to the TD-LTE time slot in the GP time slot of the TD-SCDMA (the selection of the time in the GP time slot is a limitation of the dual mode system, and only at this moment can the transmission be made. The training sequence, at other times, is a variety of useful time slots, which cannot be covered.) The TD-LTE GP time slot coincides on the time axis (you can arbitrarily select a small segment in the coincidence time period) to send dual-mode training. The sequence and the number of calculations add up the sum, and the steps are repeated multiple times, depending on the requirements and strategies of the specific device. The specific time point at which the GP sends the dual-mode training sequence is variable, and is determined according to the time slot of the dual-mode cell. Different time slots, different GP lengths, and different dual-mode training sequence transmission positions are also different.

In step S230, the accumulated sum of the multiple acquisition numbers is converted into a power value according to the corresponding relationship, and the feedback average power is calculated, that is, the accumulated sum of the respective acquisition numbers is converted into power and averaged.

In step S24Q, the output power is calculated according to the feedback average power. Specifically, the feedback power average is substituted into the feedback average power-output power calculation formula, and the specified feedback power is calculated at the specified temperature. Corresponding output power. The feedback average power-output power calculation formula calculates the gain from the detection point to the ADC link (the link through the switch 2, the mixer, the amplifier, and the filter to the ADC after coupling from the circulator in Figure 1) based on the thermometer. The expected link gain at temperature change, and then the feedback average power and the link gain are added to obtain the output power.

The present invention detects an RRU by transmitting a dual-mode training sequence at a certain time on a time axis coincident with a TD-LTE time slot in a TD-LTE time slot and a TD-LTE GP time slot. The output power enables the RRU device to accurately and completely detect the output power when operating in both TD-SCDMA and TD-LTE modes.

As shown in FIG. 3, the present invention also provides a dual-mode RRU device output power detection system, including:

The training sequence selection module 31 0 is configured to select a dual-mode training sequence with the same cell frequency characteristics according to the current cell carrier and power conditions of the TD-SCDMA and the TD-LTE in the output power detection mode.

The training sequence sending module 320 is configured to send the dual-mode training in a time period in which the guard time slot of the TD-SCDMA and the guard time slot of the TD-LTE overlap on the time axis according to the TD-LTE time slot in the next predetermined period. The sequence sums the cumulative sum and repeats the step multiple times.

The average power calculation module 330 is configured to convert the cumulative sum of the multiple acquisitions into a power value according to the corresponding relationship, and calculate the feedback average power.

The output power calculation module 340 is configured to calculate an output power according to the feedback average power. Further, the output power calculation module 340 is specifically configured to substitute the feedback power average into the feedback average power-output power calculation formula, and calculate the output power corresponding to the specified feedback power at the specified temperature.

Those of ordinary skill in the art will appreciate that various aspects of the present invention, or possible implementations of various aspects, may be embodied as a system, method, or computer program product. Thus, aspects of the invention, or possible implementations of various aspects, may be in the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, etc.), or a combination of software and hardware aspects, They are collectively referred to herein as "circuits,""modules," or "systems." Moreover, aspects of the invention, Or a possible implementation of various aspects may take the form of a computer program product, which is a computer readable program code stored in a computer readable medium.

The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium includes, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any suitable combination of the foregoing, such as random access memory (RAM), read only memory (ROM), Erase programmable read-only memory (EPROM or flash memory), optical fiber, portable read-only memory (CD-ROM).

The processor in the computer reads the computer readable program code stored in the computer readable medium, such that the processor can perform the functional actions specified in each step or combination of steps in the flowchart; A device that functions as specified in each block, or combination of blocks.

The computer readable program code can execute entirely on the user's computer, partly on the user's computer, as a separate software package, partly on the user's computer and partly on the remote computer, or entirely on the remote computer or server. . It should also be noted that in some alternative implementations, the functions noted in the various steps of the flowchart, or in the blocks in the block diagrams, may not occur in the order noted. For example, depending on the functionality involved, two steps, or two blocks, shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in the reverse order. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request

1. A dual-mode RRU equipment output power detection method, characterized by including the steps: In the output power detection mode, select a dual-mode with the same frequency characteristics as the cell according to the current cell carrier and power conditions of TD-SCDMA and TD-LTE. training sequence;

In the next predetermined period, the dual-mode training sequence is sent according to the TD-LTE time slot in the time period when the TD-SCDMA protection time slot and the TD-LTE protection time slot overlap on the time axis and the accumulated sum is calculated by collecting the numbers. Repeat this step several times;

The accumulated sum of multiple samplings is converted into a power value according to the corresponding relationship, and the feedback average power is calculated; the output power is calculated based on the feedback average power.

2. The dual-mode RRU device output power detection method according to claim 1, wherein the step of calculating the output power according to the feedback average power specifically includes: substituting the feedback power average value into the feedback average power - output power. Calculation formula to calculate the output power corresponding to the specified feedback power at the specified temperature.

3. The dual-mode RRU equipment output power detection method according to claim 1, wherein the predetermined period is 10 ms.

4. A dual-mode RRU equipment output power detection system, characterized by including: a training sequence selection module, used in the output power detection mode to select the corresponding cell according to the current cell carrier and power conditions of TD-SCDMA and TD-LTE. Dual-mode training sequences with the same frequency characteristics;

A training sequence sending module, configured to send the dual-mode training sequence in a time period in which the protection time slot of TD-SCDMA and the protection time slot of TD-LTE overlap on the time axis according to the TD-LTE time slot in the next predetermined period. And collect the numbers to calculate the cumulative sum, and repeat this step multiple times;

The average power calculation module is used to convert the accumulated sum of multiple data acquisitions into a power value according to the corresponding relationship, and calculate the feedback average power;

An output power calculation module, configured to calculate the output power according to the feedback average power.

5. The dual-mode RRU equipment output power detection system as claimed in claim 4, characterized in that, The output power calculation module is specifically used to substitute the feedback power average value into the feedback average power-output power calculation formula to calculate the output power corresponding to the specified feedback power at a specified temperature.

6. The dual-mode RRU equipment output power detection system according to claim 4, wherein the predetermined period is 10ms.