KR100819151B1 - Method for coverage optimum of forwarding link inter network - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for optimizing forward link coverage in an intergenerational network and a computer readable recording medium having recorded thereon a program for realizing the method.

2. Technical problem to be solved by the invention

The present invention, in the intergenerational network for maintaining the same coverage by adjusting the ratio of the total power (Pilot Power) to the pilot power (Pilot Power) for stable operation with the existing service network due to the increase of subscribers of the high-speed mobile communication network It is an object of the present invention to provide a method for optimizing the forward link coverage of a computer and a computer-readable recording medium recording a program for realizing the method.

3. Summary of the Invention Solution

The present invention provides a method for optimizing forward link coverage in an inter-generational network, comprising: a first step of calculating traffic volume for voice and data calls through forward and reverse directions based on a current power allocation ratio; Calculating a power allocation ratio for each channel to vary the digital gain, and comparing the variable digital gain with the variable digital gain by dividing the total power value of the base station and comparing the digital gains; A third step of confirming whether a difference value between Ec / Io calculated based on the variable digital gain and Ec / Io calculated based on the digital gain before the variable is within a set range; A fourth step of setting a set digital gain and changing a forward attenuation index (TX_ATTEN) according to the set digital gain when within the set range; And a fifth step of changing the handoff parameter to reduce the overlap rate between base stations.

4. Important uses of the invention

The present invention is used in the next generation mobile communication system.

       Coverage, Base Station, Pilot, Digital Gain, and Parameter Changes

Description

A method for optimizing forward link coverage in intergenerational networks             

1 is a flow diagram of an embodiment of a method for optimizing forward link coverage in an intergenerational network according to the present invention.

The present invention relates to a method for optimizing forward link coverage in a generational network. More specifically, the base station total power vs. pilot power for stable operation with an existing service network due to the increase of subscribers in a high speed mobile communication network. The present invention relates to a method of optimizing forward link coverage in an intergenerational network for maintaining coverage by adjusting a ratio, and to a computer-readable recording medium having recorded thereon a program for realizing the method.

In general, to optimize 2000 1X systems (hereinafter referred to as "2.5G systems") and 95A-based CDMA systems (hereinafter referred to as "2G systems"), base station base testing, coverage optimization, system capacity optimization, and hardening period hard handoff optimization For example, call quality optimization and location registration success rate optimization are required. The coverage optimization is classified into a forward link coverage optimization and a reverse link coverage optimization.

In particular, when the forward link coverage is less than the reverse link coverage, the coverage is expanded by simply increasing the output strength of the pilot using TX Attenuation, and when the forward link coverage is larger than the reverse link coverage. On the contrary, the attenuation index is used to reduce the coverage by lowering the pilot output strength.

In addition, when the coverage is large and the handoff area between neighboring base stations is too large and mutual interference is severe, it may be reduced by adjusting the inclination of the antenna. In particular, in the existing service network in which 2G and 2.5G networks exist, efficient and stable parameter adjustment between base stations is on the rise due to the increase of subscribers of 2.5G in recent years.

Here, when comparing the parameters between the 2G system and 2.5G system in Table 1 based on the theoretical background as follows.

2G system 2.5G system Remarks Pilot gain 108 137 Sink gain 34 97 Paging gain 65 133 Standard: 128 Traffic gain 57 103

In addition, the overhead channel power ratio according to the digital gain is described in Table 2 below.

division Digital gain Channel power ratio Ec / Io Pilot Sink Paging Pilot Sink Paging 2G (N = 20) a 108 34 65 0.68 0.068 0.25 -5.99 b 108 34 77 0.62 0.062 0.32 -6.41 c 108 34 95 0.53 0.053 0.41 -6.41 2.5G (N = 10) a 137 97 133 0.53 0.053 0.42 -3.52 b 132 92 127 0.54 0.054 0.41 -3.66

That is, as shown in Table 2, there is no application conversion because the call volume is small, but it can be expected that the fluctuation of capacity or quality will be large when the call volume increases and the data call increases.

Next, look at the base station output determination parameters through Table 3.

division 2G 2.5G Digital gain Linear from 0 to 127 0-165 dB Scale Digital Gian 1: 0.25 dB Step Digital Gain and dB relationship Digital Gain = (dB + 41) * 4 + 1 dB = (D.G-1) / 4-41 TX_ATTEN 0 to 899 0-700 dB Scale TX_ATTEN 1: 0.1dB Step

As can be seen from Table 3, the maximum power is increased up to 25W according to the calculated value, but when it is over 25W, the base station software calculates the base station output with digital gain and attenuation index every 20ms. Keep it. At this time, the forward coverage has a decreasing effect.                         

Meanwhile, in order to maintain the same coverage as the existing 2G system in the 2.5G system, traffic channel calibration, RX IF level, frequency accuracy test, pilot time error, pilot channel and code channel time error on the forward link Performs spurious measurement, total power measurement and pilot power measurement, and performs RX IF level characteristic (IADU characteristic test), AGC characteristic (CIP: Channel Interface Processor) and RX IF cable identification test on reverse link do.

Recently, due to an increase in subscribers in 2.5G networks, that is, high-speed telecommunication networks, interference between networks may occur along with generation of low data throughput areas, thus maintaining the same coverage for stable operation.

Accordingly, the present invention has been made to meet the above-mentioned conventional requirements, and the base station total power (Pilot Power) versus pilot power (Pilot Power) for stable operation with the existing service network due to the increase of subscribers of the high-speed mobile communication network It is an object of the present invention to provide a method of optimizing forward link coverage in an intergenerational network for adjusting the ratio to maintain the same coverage, and a computer-readable recording medium having recorded thereon a program for realizing the method.

The method of the present invention for achieving the above object, in the method for optimizing the forward link coverage in the inter-generational network, the method for calculating the traffic volume by voice and data call through the forward and reverse based on the current power allocation ratio Stage 1; Calculating a power allocation ratio for each channel to vary the digital gain, and comparing the variable digital gain with the variable digital gain by dividing the total power value of the base station and comparing the digital gains; A third step of confirming whether a difference value between Ec / Io calculated based on the variable digital gain and Ec / Io calculated based on the digital gain before the variable is within a set range; A fourth step of setting a set digital gain and changing a forward attenuation index (TX_ATTEN) according to the set digital gain when within the set range; And a fifth step of changing the handoff parameter to reduce the overlap rate between base stations.

On the other hand, the present invention provides a mobile communication system having a processor for optimizing forward link coverage, comprising: a first function of calculating a traffic volume by voice and data calls through forward and reverse directions based on a current power allocation ratio; A second function of varying a digital gain by calculating a power allocation ratio for each channel, and comparing the variable digital gain with the variable digital gain by the total power value of the base station; A third function of checking whether a difference value between Ec / Io calculated on the basis of the variable digital gain and Ec / Io calculated on the basis of the digital gain before the variable is within a set range; A fourth function of setting a set digital gain and changing a forward attenuation index (TX_ATTEN) according to the set digital gain when within the set range; And a computer-readable recording medium having recorded thereon a program for realizing a fifth function of changing the handoff parameter to reduce the overlap rate between base stations.

Hereinafter, a preferred embodiment of a method for optimizing forward link coverage in an intergenerational network according to the present invention will be described in detail with reference to the accompanying drawings.

Parameters for determining coverage of the forward link include RSSI (Received Signal Strength Indicator), Ec / Io, FFER, etc. of the terminal. Proper optimization of power allocation, load on the link, base station output, forward power control parameters, etc. for testing is required, but the present invention describes coverage optimization by adjusting the digital gain on the ring direction link.

1 is a flow diagram of an embodiment of a method for optimizing forward link coverage in an intergenerational network according to the present invention.

As shown in FIG. 1, first, the traffic volume for voice and data calls is calculated through forward and reverse directions based on the current power allocation ratio (11).

At this time, it is preferable that the azimuth, tilt angle, gain, etc. of the antenna considering the neighboring cells together with the calculated traffic amount are determined.

Subsequently, the digital gain is varied by calculating the power allocation ratio for each channel, and the variable digital gain and the digital gain before the variable are divided by the total power values of the base station and compared with each other (12).

In this case, the digital gain includes a pilot gain, a sync gain, a paging gain, and a traffic gain.                     

Accordingly, it is determined whether the difference value between the Ec / Io calculated based on the variable digital gain and the Ec / Io calculated based on the digital gain before the variable is within the set range (13).

As a result of the determination in step 13, if the difference value between Ec / Io before and Ec / Io after the variable is out of the set range, the process returns to step 12 to continuously repeat the loop while varying the digital gain. .

On the other hand, as a result of the determination in step 13, if the difference value between Ec / Io before and Ec / Io after the variable is within the set range, that is, a condition that can maintain the same coverage as 2G, the variable digital gain is set (14).

Then, the operating station operating the base station and the base station controller changes the forward attenuation index TX_ATTEN to suit the set digital gain (15), and changes the handoff parameter to reduce the overlap rate between the base stations. At this time, the parameters of the handoff are T_ADD, T_DROP and T_T_DROP.

As mentioned above, preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.

According to the present invention, a method for optimizing forward link coverage in a generational network according to the present invention includes adjusting subscriber base station total power to pilot power ratios to maintain the same coverage, thereby allowing subscribers of a high-speed telecommunication network. Due to the increase, it is a useful invention that enables stable operation with the existing service network.

Claims (4)

In the forward link coverage optimization method in an intergenerational network, Calculating a traffic volume by voice and data calls through forward and reverse directions based on a current power allocation ratio; Calculating a power allocation ratio for each channel to vary the digital gain, and comparing the variable digital gain with the variable digital gain by dividing the total power value of the base station and comparing the digital gains; A third step of confirming whether a difference value between Ec / Io calculated based on the variable digital gain and Ec / Io calculated based on the digital gain before the variable is within a set range; A fourth step of setting a set digital gain and changing a forward attenuation index (TX_ATTEN) according to the set digital gain when within the set range; And Changing a handoff parameter to reduce the overlap rate between base stations; A method for optimizing forward link coverage in an intergenerational network comprising a. The method of claim 1, The digital gain includes a pilot gain, a sync gain, a paging gain, and a traffic gain. The method of claim 1, wherein the parameters of the handoff to be changed are T_ADD, T_DROP, and T_T_DROP. In order to optimize forward link coverage, a mobile communication system having a processor, A first function of calculating the amount of traffic by voice and data calls in the forward and reverse directions based on the current power allocation ratio; A second function of varying a digital gain by calculating a power allocation ratio for each channel, and comparing the variable digital gain with the variable digital gain by the total power value of the base station; A third function of checking whether a difference value between Ec / Io calculated on the basis of the variable digital gain and Ec / Io calculated on the basis of the digital gain before the variable is within a set range; A fourth function of setting a set digital gain and changing a forward attenuation index (TX_ATTEN) according to the set digital gain when within the set range; And Fifth function of changing handoff parameters to reduce overlapping rate between base stations A computer-readable recording medium having recorded thereon a program for realizing this.

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