WO2013104326A1

WO2013104326A1 - Uplink channel link budget method and device

Info

Publication number: WO2013104326A1
Application number: PCT/CN2013/070330
Authority: WO
Inventors: 卢树颖; 曹艳霞; 贾保灵
Original assignee: 电信科学技术研究院
Priority date: 2012-01-12
Filing date: 2013-01-10
Publication date: 2013-07-18
Also published as: CN102572857A; CN102572857B

Abstract

Disclosed are an uplink channel coverage radius determination method and device, the method comprising: determining the uplink channel carrier-to-interference ratio (CIR) of an edge user in a planned cell; determining the uplink channel target signal-to-noise ratio (SNR) of the edge user according to the uplink channel CIR of the edge user; and determining the maximum coverage distance of the uplink channel according to the uplink channel target SNR of the edge user. The present invention improves uplink budget accuracy.

Description

Method and device for budgeting of uplink channel link. This application claims to be filed on January 12, 2012, the Chinese Patent Office, the application number is 201210008466.7, the Chinese patent application entitled "An Uplink Channel Link Budget Method and Equipment" Priority is hereby incorporated by reference in its entirety.

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for determining an uplink channel coverage radius. Background technique

The link budget is the main method to evaluate the coverage capability of the wireless communication system. The link coverage can estimate the coverage distance and coverage area of the cell in the planned area. Combined with the area of the planned area, the number of base stations in the planned area can be estimated. Regional network size accounting provides a reference for coverage. Therefore, the link budget is important for estimating the network size and the operational performance of the later network.

The existing uplink channel link budget method generally performs uplink link budget based on the uplink interference margin of the uplink channel, and first calculates the uplink interference value according to the uplink interference margin and the uplink noise floor level of the system, and further calculates the uplink interference value. The maximum coverage distance of the uplink channel, where the value of the uplink interference margin is generally obtained through system simulation. Summary of the invention

It is an object of the present invention to provide a method and apparatus for determining an uplink channel coverage radius, which improves the accuracy of an uplink budget. In order to achieve the above objective, an embodiment of the present invention provides an uplink channel link budget method, including:

Determining the uplink channel carrier-to-interference ratio CIR of the user at the edge of the planning area;

Determining, according to an edge channel CIR of the edge user, an uplink channel target signal to noise ratio SNR of the edge user;

Determining a maximum coverage macro of the uplink channel based on an uplink channel target SNR of the edge user.

The embodiment of the present invention further provides an uplink channel link budgeting device, including: a first determining module, configured to determine an uplink channel carrier-to-interference ratio CIR of a user of a planned area edge;

a second determining module, configured to determine, according to an uplink channel CIR of the edge user, an uplink channel target signal to noise ratio SNR of the edge user;

And a third determining module, configured to determine a maximum coverage distance of the uplink channel according to an uplink channel target SNR of the edge user. In the above embodiment, the uplink channel CIR of the edge user of the planning area is determined, and the uplink channel target SNR of the edge user is determined according to the uplink channel CIR of the edge user, and then the uplink is determined according to the uplink channel target SNR of the edge user. The maximum coverage distance of the channel increases the accuracy of the uplink budget. DRAWINGS

1 is a schematic flowchart of a method for estimating an uplink channel link according to an embodiment of the present invention;

The figure is an uplink channel for determining an edge user of a planned area according to an embodiment of the present invention.

Schematic diagram of the CIR process;

3 is a schematic diagram of a CDF curve of an uplink channel CIR according to an embodiment of the present invention; 4 is a schematic flowchart of determining a signal to noise ratio of an uplink channel target of an edge user in a planned area according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an uplink channel link budget device according to an embodiment of the present invention. detailed description

In the existing uplink channel link budgeting technology, the uplink channel link budget is directly based on the uplink interference margin, which embodies a certain edge coverage probability of the planned area, but the uplink transmit power (which affects the uplink interference margin) passes power. The control determines that there is no exact correspondence between the edge coverage probability and the area coverage probability. The corresponding area coverage probability cannot be determined by this method, and the channel conditions of the edge users of the planning area cannot be accurately reflected.

As the coverage distance of the cell increases, the large-scale fading increases, the interference margin also changes, and the correlation between the uplink interference margin and the distance is relatively high. The existing uplink channel link budget method needs to acquire different conditions. The interference margin under the parameters (cell radius and other parameters) is used for the link budget of different cell radius, and the workload is relatively large.

In view of the above problems in the prior art, the embodiments of the present invention provide a technical solution for an uplink channel link budget. In the technical solution, the uplink channel target SNR (Signal Noise Ratio) of the edge user is determined according to the uplink channel CIR (Carrier to Interference Ratio) of the edge user of the planning area, and the uplink channel CIR of the edge user is determined. Signal-to-noise ratio), and then determining the maximum coverage distance of the uplink channel according to the uplink channel target SNR of the edge user, improving the accuracy of the uplink budget and the efficiency of the wireless network planning work.

The CIR is defined as the ratio of the received power of the wanted signal to the interference power. The CDF distribution of the uplink channel CIR fully reflects the signal-to-noise ratio distribution of the users in the planned area. The embodiment of the present invention obtains the CIR that the edge user can achieve by using the CIR distribution of the uplink channel. It clearly reflects the channel conditions of the edge users, and based on the maximum coverage distance of the uplink channel of the edge user's CIR, can more accurately reflect the channel conditions of the edge users, fully consider the influence of the uplink power control on the link budget, and improve the impact. The accuracy of the uplink budget. At the same time, since the correlation between the uplink maximum coverage distance and the station spacing and the penetration loss parameter determined by the CIR is small in the embodiment of the present invention, it is not necessary to configure different CIR values according to different station spacing and penetration loss, thereby improving the wireless. Network planning work efficiency

The technical solutions in the present application are clearly and completely described in the following with reference to the drawings in the present application. It is obvious that the described embodiments are a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without creative efforts are within the scope of the present disclosure.

As shown in FIG. 1 , a schematic flowchart of an uplink channel link budgeting method according to an embodiment of the present invention may include the following steps:

Step 101: Determine an uplink channel CIR of the user at the edge of the planning area.

Specifically, in the embodiment of the present invention, determining the uplink channel CIR of the edge user of the planning area may be implemented by using the process shown in FIG. 2:

Step 101A: Determine a power control parameter configuration of an edge user uplink channel.

Specifically, since the uplink transmit power is determined by using a power control algorithm, different power control algorithms also affect the value of the uplink channel CIR. Therefore, the uplink channel CIR acquisition of the edge user needs to be configured based on different power control algorithm parameters.

Step 101B: Obtain a CDF (Cumulative Distribution Function) curve of the CIR of the uplink channel of the planning area.

Specifically, the acquisition of the CDF curve of the uplink channel CIR is generally obtained by a system simulation method. For example, based on the scene type characteristics of the planning area and different power control parameter configurations, the system simulation is performed, and then the CDF curve of the user CIR in the simulation area is obtained. The schematic can be as shown in Figure 3. The CDF distribution curve of the uplink channel CIR and the vertical axis corresponding to the random point X on the horizontal axis take the value, indicating the probability that the uplink channel CIR of the user in the planned area is less than X.

Step 101C: Determine an uplink channel CIR of the edge user according to a power control parameter configuration of the edge user uplink channel and a CDF curve of the planned area uplink channel CIR.

Specifically, it is assumed that the area coverage probability of the planned area scenario is P, and the horizontal axis coordinate value corresponding to the vertical axis coordinate (1-P) of the CDF curve of the uplink channel CIR is taken, and the value is the edge user uplink of the power control parameter configuration. The CIR value that the channel can reach.

Take the distribution diagram shown in Figure 3 as an example, assuming CIR configured with different power parameters.

CIR CIR

The CIRs obtained by the CDF curve are:

CIR

c ^onfign . The minimum of these CIRs can be used as the upstream channel of the edge user for network size coverage estimation. which is:

Z _2mm { R _gli CIR _configli ...... ' CIR _→ see Table 1 . The CIR values under different power control parameters are _{listed in} Table 1. The CIR value is -0.29 as the edge user uplink channel CIR. Road budget.

Table 1 Power Control Parameter Configuration Combination 10% C/I Gang

Configl -0.29

Config2 -0.30

Config3 -0.17

Config4 0.21

Config5 0.92 Config6 1.33

Config7 1.34

Config8 1.34

Config9 1.33

ConfiglO 1.33

Configll 1.31 It should be noted that, in the embodiment of the present invention, the minimum value of the CIR may be taken in the initial stage of network construction, and the uplink channel CIR of the edge user is used for network size coverage estimation, but in the middle and late stages of network construction, The level of coverage of the edge user can be improved by adjusting the uplink power control parameters. The specific implementation is not described here.

Step 102: Determine an uplink channel target signal to noise ratio SNR of the edge user according to an edge channel CIR of the edge user.

Specifically, the SNR is defined as the ratio of the useful signal power to the system noise floor power. In the embodiment of the present invention, the uplink channel target SNR of the edge user is calculated according to the demodulation threshold ^SJNR ^, the edge user uplink channel CIR, and the uplink channel load factor. Wherein the demodulation threshold ^¹ ^ ^ ^Μ acquired by the link simulation, it is defined as the desired signal receiving power and interference power plus noise power ratio; edge users uplink channel CIR obtained by step 101; uplink channel load factor ^ is The value of the uplink traffic channel load in the planning area. The specific implementation process can be as shown in Figure 4:

Step 102: Determine the uplink channel IoT of the edge user according to the uplink channel CIR of the edge user.

Specifically, the uplink channel IoT (Interference over Thermal Noise) The ascending) is defined as the ratio of the uplink interference power to the noise floor. In this step, determining the uplink channel target SNR of the edge user according to the uplink channel CIR of the edge user and the uplink channel IoT of the edge user is specifically implemented by the following formula:

IoT = ' ^SINR thd -

CIR_TJ SINR^ where ^TM^^ is a demodulation threshold, and ^ is a system uplink channel load factor.

Step 102B: Determine an uplink channel target SNR of the edge user according to an uplink channel CIR of the edge user and an uplink channel IoT of the edge user.

Specifically, in the embodiment of the present invention, determining the uplink channel target SNR of the edge user according to the uplink channel CIR of the edge user and the uplink channel IoT of the edge user is specifically implemented by using the following formula:

CIR

SNR = IoT ^

η

Step 103: Determine a maximum coverage distance of the uplink channel according to an uplink channel target SNR of the edge user.

Specifically, in the embodiment of the present invention, the uplink channel target of the edge user is determined.

After SNR, the receiver sensitivity can be determined based on the target SNR and the system noise floor power, namely:

Receiver sensitivity = system noise floor power + target SNR

Among them, the formula is calculated in units of db.

After determining the receiver sensitivity, the maximum path loss allowed in the planned area is determined according to the receiver sensitivity, the equivalent omnidirectional transmit power of the transmitter, the shadow fading margin, and the penetration loss parameter, and then determined according to the maximum path loss allowed in the planned area. The uplink service letter The maximum coverage distance of the track.

Through the foregoing process, it can be seen that, in the technical solution provided by the embodiment of the present invention, the uplink channel CIR of the edge user of the planning area is determined, and the uplink channel target SNR of the edge user is determined according to the uplink channel CIR of the edge user (Signal Noise) Ratio, signal to noise ratio, and then determine the maximum coverage distance of the uplink channel according to the edge channel target SNR of the edge user, improve the accuracy of the uplink budget, and the efficiency of the wireless network planning work.

Based on the same technical concept of the foregoing method embodiment, the embodiment of the present invention further provides an uplink channel link budget device, which can be applied to the foregoing method flow.

As shown in FIG. 5, a schematic structural diagram of an uplink channel link budget device according to an embodiment of the present invention may include:

The first determining module 51 is configured to determine an uplink channel CIR of the edge user of the planning area; the second determining module 52 is configured to determine, according to the uplink channel CIR of the edge user, an uplink channel target signal to noise ratio SNR of the edge user;

The third determining module 53 is configured to determine a maximum coverage distance of the uplink channel according to an uplink channel target SNR of the edge user.

The first determining module 51 is specifically configured to: determine a power control parameter configuration of the edge user uplink channel; obtain a cumulative distribution function CDF curve of the uplink channel CIR of the planning area; and according to the power of the edge user uplink channel The control parameter configuration and the CDF curve of the planning region upstream channel CIR determine the upstream channel CIR of the edge user.

The second determining module 52 is specifically configured to: determine, according to an uplink channel CIR of the edge user, an uplink channel IoT of the edge user; according to an uplink channel CIR of the edge user, and an uplink channel IoT of the edge user. The upstream channel target SNR of the edge user is determined. The determining, by the second determining module 52, the uplink channel IoT of the edge user according to the uplink channel CIR of the edge user is specifically implemented by using the following formula:

And determining, by the second determining module, the uplink channel target SNR of the edge user according to the uplink channel CIR of the edge user and the uplink channel IoT of the edge user, by using the following formula:

CIR

SNR = IoT ^

The ^TM^^ is a demodulation threshold, and the ^ is a system uplink channel load factor.

The third determining module is specifically configured to determine a receiver sensitivity according to an uplink channel target SNR of the edge user and a system bottom noise power; according to the receiver sensitivity, a transmitter equivalent omnidirectional transmit power, and a shadow fading The remaining amount and the penetration loss parameter determine a maximum path loss allowed in the planned area; and determine a maximum coverage distance of the uplink service channel according to a maximum path loss allowed by the planned area.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Based on this understanding, the form of the software product is embodied in a storage medium, including a number of instructions for causing a terminal device (which may be a mobile phone, a personal computer, a server, or a network device, etc.) The method described in various embodiments of the present invention is performed. The above description is only a preferred embodiment of the present invention, it should be noted that it is for the technical field. A person skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. These improvements and retouchings should also be considered as the scope of protection of the present invention.

Claims

Rights request

An uplink channel link budget method, which is characterized by comprising:

The method according to claim 1, wherein the determining the uplink channel CIR of the edge user of the planning area includes:

Determining a power control parameter configuration of the edge user uplink channel;

Obtaining a cumulative distribution function CDF curve of the uplink channel CIR of the planning area; determining an uplink channel CIR of the edge user according to a power control parameter configuration of the edge user uplink channel and a CDF curve of the planning area uplink channel CIR.

The method according to claim 1, wherein the determining, by the edge user, an uplink channel CIR, an uplink channel target signal to noise ratio (SNR) of the edge user, specifically:

Determining, by the edge user, an uplink channel CIR, an uplink channel interference lifting IoT of the edge user;

And determining an uplink channel target SNR of the edge user according to the uplink channel CIR of the edge user and the uplink channel IoT of the edge user.

4. The method of claim 3, wherein said according to said edge The uplink channel CIR of the user determines that the uplink channel IoT of the edge user is specifically implemented by the following formula:

IoT II

The CIR-TJ SINR is determined according to the uplink channel CIR of the edge user and the uplink channel IoT of the edge user, and the uplink channel target SNR of the edge user is determined by the following formula:

CIR

SNR = IoT ^

Wherein, the ^ ¹ ^^ is a demodulation threshold, and the ^ is a system uplink channel load factor.

The method according to claim 1, wherein the determining, according to the uplink channel target SNR of the edge user, the maximum coverage distance of the uplink channel, specifically: according to the uplink channel target SNR of the edge user And determining a receiver sensitivity according to the system noise power; determining a maximum path loss allowed in the planned area according to the receiver sensitivity, the transmitter equivalent omnidirectional transmit power, the shadow fading margin, and the penetration loss parameter; The path loss maximum allowed in the planning area determines the maximum coverage distance of the uplink traffic channel.

An uplink channel link budget device, comprising: a first determining module, configured to determine an uplink channel carrier interference of a user at a planned area edge a second determining module, configured to determine an uplink channel target SNR of the edge user according to an uplink channel CIR of the edge user; a third determining module, configured to determine, according to an uplink channel target SNR of the edge user The maximum coverage distance of the uplink channel.

The device according to claim 6, wherein the first determining module is specifically configured to: determine a power control parameter configuration of an uplink channel of the edge user; and obtain a cumulative distribution function of an uplink channel CIR of the planning area. a CDF curve; determining an uplink channel CIR of the edge user according to a power control parameter configuration of the edge user uplink channel and a CDF curve of the planned area uplink channel CIR.

The device according to claim 6, wherein the second determining module is configured to determine, according to an uplink channel CIR of the edge user, an uplink channel interference lifting IoT of the edge user; according to the edge user The uplink channel CIR and the edge channel of the edge user ΤοΤ determine the uplink channel target SNR of the edge user.

The device according to claim 8, wherein the second determining module determines, according to the uplink channel CIR of the edge user, an uplink channel IoT of the edge user, which is specifically implemented by using the following formula:

IoT II

CIR_TJ SINR^ The second determining module determines the uplink channel target SNR of the edge user according to the uplink channel CIR of the edge user and the uplink channel IoT of the edge user The body is implemented by the following formula:

CIR

SNR = IoT ^

η where, ¹ is a demodulation threshold, and the ^ is a system uplink channel load factor.

10. Apparatus according to claim 6 wherein:

The third determining module is specifically configured to determine a receiver sensitivity according to an uplink channel target SNR of the edge user and a system bottom noise power; according to the receiver sensitivity, a transmitter equivalent omnidirectional transmit power, and a shadow fading margin And a penetration loss parameter determines a maximum path loss allowed by the planned area; and a maximum coverage distance of the uplink service channel is determined according to a maximum path loss allowed by the planned area.