CN101325793B - Method for detecting limitation link in wireless communication system - Google Patents

Abstract

The invention proposes a method for detecting restricted links in a wireless communication system, which is designed for the problem that the restricted links in the forward link and the reverse link cannot be determined in the prior art. In the present invention, the base station or the terminal sends data packets to the opposite end, or the base station and the terminal send data packets to the opposite end at the same time or separately, and the opposite end returns a return data packet to the sending end, and then counts the packet loss rate of the above data packets and the returned data packets or success rate, and determine the restricted link with poor line quality through the packet loss rate or success rate. The method proposed by the invention can be applied in any wireless communication field, is simple but very practical, and can realize rapid detection of blocked links without performing hardware transformation on the existing system.

Description

A method for detecting restricted links in a wireless communication system

technical field

The invention relates to the field of wireless communication, in particular to a method for detecting restricted links in a wireless communication system.

Background technique

In the field of wireless communication, the communication between the mobile station and the base station includes two links, called uplink and downlink, or forward link and reverse link, which are represented by forward link and reverse link below two links. The link from the base station to the mobile station is called the forward link; the line from the mobile station to the base station is called the reverse link. In wireless communication, the coverage of forward link and reverse link is affected by factors such as frequency, terminal and system demodulation sensitivity, system internal interference and external interference, network topology, number and distribution of users, etc. Quality varies with the environment and cannot be predicted in advance. Due to the above-mentioned characteristics of wireless communication, the forward link and the reverse link are unbalanced, and the restricted link is not fixed.

The Chinese patent application number is CN00104997.6, titled "System and Method for Preventing Reverse Congestion Caused by Unbalanced Links in a Wireless Communication System", which discloses a power control method for CDMA systems, which can prevent unbalanced links. The reverse congestion problem generated by the balance. At the same time, U.S. Patents 6,785,249 and 6,950,417, both titled "Method and apparatus for detecting forward and reverse link imbalance in digital cellular communication systems" (Method and apparatus for detecting forward and reverse link imbalance in digital cellular communication systems), disclose a cellular A method for detecting link imbalance in a communication system. This method uses the maximum access pointer to indicate whether there is a reverse failure caused by link imbalance, and uses paging channel loss indication and traffic channel initialization timeout to determine whether there is link imbalance. Forward link failure due to balance. The invention is mainly used for searching and discovering reverse problems.

Therefore, the prior art lacks a method for detecting which of the forward link and the reverse link is restricted.

Contents of the invention

Aiming at the defects and deficiencies in the prior art, the purpose of the present invention is to provide a method for detecting restricted links in a wireless communication system, which can simply detect restricted links in the forward link and the reverse link.

In order to achieve the purpose of the above invention, the present invention proposes a method for detecting restricted links in a wireless communication system, including:

Step 1, the terminal and/or base station sends a data packet to the opposite end;

Step 2. Count the success rate or packet loss rate of receiving data packets of the two links respectively, and determine the restricted link.

Wherein, the above step 1 may specifically be:

Step 1-1, the terminal sends a data packet to the base station;

Step 1-2. After receiving the above data packet, the base station sends a return data packet to the terminal.

Then the above step 2 is specifically:

Step 2-1, counting the number of data packets sent by the terminal; counting the number of return data packets sent by the base station; counting the number of return data packets received by the terminal, and counting the number of data packets received by the base station;

Step 2-2. Divide the number of returned data packets received by the terminal by the number of returned data packets sent by the base station to obtain the quality of the forward link; divide the number of data packets received by the base station by the number of data packets sent by the terminal to obtain the reverse link quality. link quality;

Steps 2-3, comparing the quality of the forward link and the quality of the reverse link, wherein the link with a higher packet loss rate is a restricted link.

In the above manner, the test is initiated by the terminal side.

Wherein, the above step 1 may also be specifically:

Steps 1-3, the base station sends a data packet to the terminal;

Steps 1-4, the terminal sends a return data packet to the base station.

Then step 2 is specifically:

Step 2-4, counting the number of data packets sent by the base station; the number of return data packets sent by the statistics terminal; the quantity of the return data packets received by the statistics base station, and the quantity of the data packets received by the statistics terminal;

Steps 2-5, divide the number of data packets received by the terminal by the number of data packets sent by the base station to obtain the quality of the forward link; divide the number of returned data packets received by the base station by the number of returned data packets sent by the terminal to obtain the reverse link quality. link quality;

Steps 2-6, comparing the quality of the forward link and the quality of the reverse link, wherein the link with a higher packet loss rate is a restricted link.

In the above manner, the test is initiated by the base station side.

Wherein, the above step 1 can be specifically:

Steps 1-5, the base station and the terminal send data packets to the opposite end at the same time;

Steps 1-6: After receiving the above data packet, the base station and the terminal send a return data packet to the opposite end.

Wherein, the above step 1 can also be specifically:

Steps 1-7, the base station and the terminal successively send data packets to the opposite end;

Steps 1-8: After receiving the above data packet, the base station and the terminal send a return data packet to the opposite end.

By adopting the above method, the base station and the terminal can simultaneously or separately send data packets to the opposite end, so as to improve the reliability of the test.

Then step 2 can be specifically:

Steps 2-7, counting the number of data packets sent by the base station or terminal, and counting the number of data packets received by the base station or terminal;

Steps 2-8, divide the number of data packets received by the terminal by the number of data packets sent by the base station to obtain the quality of the forward link; divide the number of data packets received by the base station by the number of data packets sent by the terminal to obtain the quality of the reverse link ;

Steps 2-9, comparing the quality of the forward link and the quality of the reverse link, and the link corresponding to the one with the lower success rate of receiving data packets is the restricted link.

By adopting the method that the base station and the terminal send data packets to the opposite end at the same time, only the number of sent data packets and the number of received data packets can be counted to evaluate the quality of the link.

The above step 2 can also be specifically:

Step 2-10, counting the number of data packets sent by the base station and the terminal, counting the number of data packets received by the base station and the terminal; counting the number of return data packets sent by the base station and the terminal, and counting the number of return data packets received by the base station and the terminal

Step 2-11, divide the number of data packets received by the terminal and the number of returned data packets received by the terminal by the number of data packets sent by the base station and the number of returned data packets sent by the base station to obtain the forward link quality; The reverse link quality is obtained by dividing the number of data packets and the number of return data packets received by the base station by the number of data packets sent by the terminal and the number of return data packets sent by the terminal;

Step 2-12, compare the quality of the forward link and the quality of the reverse link, and the link corresponding to the one with the lower success rate of receiving data packets is the restricted link.

By using the base station and the terminal to send data packets separately, the quality of the link can be tested by superimposing the number of data packets of the two tests, or the above-mentioned method of sending packets at the same time can be used to count only the number of sent data packets and received data The number of packets to evaluate the quality of the link.

Wherein, in the step 1, the base station and the terminal use the ping command of the TCP/IP protocol to send the data packet.

The present invention proposes a method for detecting restricted links in a wireless communication system, aiming at the inability to determine the restricted links in the forward link (or uplink) and reverse link (or downlink) in the prior art designed for link problems. In the present invention, the base station or the terminal sends data packets to the opposite end or the base station and the terminal send data packets to the opposite end at the same time, and the opposite end returns a return data packet to the sending end, and then counts the packet loss rate or success of the above data packets and the returned data packets Rate, and determine the limited link with poor line quality through the packet loss rate or success rate. The method proposed by the invention is simple but very practical. The ping command in the TCP/IP protocol can be used to send data packets and return data packets, and fast detection of blocked links can be realized without hardware modification of the existing system. At the same time, the method proposed by the present invention can also be used to evaluate the coverage of the forward link and the reverse link. Utilizing the time synchronization between the sending side and the receiving side, the sending and receiving data packets can be mapped to the test line to obtain the coverage of the forward link and the reverse link.

Description of drawings

Fig. 1 is the flowchart of the first preferred embodiment of the present invention;

Fig. 2 is the flow chart of the second preferred embodiment of the present invention;

Fig. 3 is the flowchart of the third preferred embodiment of the present invention;

Fig. 4 is the flowchart of the fourth preferred embodiment of the present invention;

Fig. 5 is a flowchart of the fifth preferred embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

The first preferred embodiment of the present invention is shown in Figure 1, comprising:

Step a, the terminal sends multiple data packets to the base station by using the ping command through the reverse link;

Step b. After receiving the above data packets, the base station sends multiple return data packets to the terminal through the forward link;

Step c, counting the number of data packets sent by the terminal; counting the number of return data packets sent by the base station; counting the number of return data packets received by the terminal, and counting the number of data packets received by the base station;

Step d, the number of returned data packets received by the terminal ÷ the number of returned data packets sent by the base station × 100% = the success rate of receiving data packets on the forward link; the number of data packets received by the base station ÷ the number of data packets sent by the terminal × 100% = the success rate of receiving data packets on the reverse link;

Step e, comparing the two values obtained in step d, the link with a lower success rate is a restricted link.

In the above steps c2 and c3, the method of counting the packet loss rate may also be used, and the link with a higher packet loss rate is a restricted link.

In the first embodiment, if applied to a GSM network, the forward link is the downlink and the reverse link is the uplink.

Of course, the base station and the terminal can also send data packets in other ways than the ping command, which can be understood by those skilled in the art.

The second preferred embodiment of the present invention is shown in Figure 2, including:

Step A, the base station sends multiple data packets to the terminal on the forward link through the ping command;

Step B. After receiving the above data packets, the terminal sends multiple return data packets to the base station through the reverse link;

Step C, counting the number of data packets sent by the base station; counting the number of return data packets sent by the terminal; counting the number of return data packets received by the base station, and counting the number of data packets received by the terminal;

Step D, 1—(the number of data packets received by the terminal ÷ the number of data packets sent by the base station×100%)=the packet loss rate of the forward link receiving data packets; 1—(the number of returned data packets received by the base station ÷ the terminal The number of returned data packets sent × 100%) = the packet loss rate of the reverse link received data packets;

Step E, comparing the two values obtained in step D, the link with a higher packet loss rate is a restricted link.

In the above steps, the method of counting the success rate in the first embodiment may also be used, and the link with a lower success rate is a restricted link.

Of course, the base station and the terminal can also send data packets in other ways than the ping command, which can be understood by those skilled in the art.

Considering that the wireless link is affected by many factors such as the surrounding environment, there are also relatively large differences in the wireless link at the same location at different times. The quality of the wireless link when the forward link is successfully received is better than when the forward link fails to receive , use the packet successfully received by the forward link as the sent packet of the reverse link to judge, it is unfair to the forward link, in order to better evaluate the restricted party of the front reverse link, the above method can be carried out expand.

The extended method is: both the base station and the terminal send data packets, and then each uses a packet capture tool to capture the data packets sent by the other party. The base station and the terminal can send data packets at the same time, or can send data packets one after the other. If it is sent at the same time, the captured data packet includes the data packet sent by the other party and the returned data packet fed back by the local party after sending. The test can be carried out in two ways of sending packets at the same time or not sending packets at the same time. The success rate of packet capture is calculated separately as the evaluation standard of the front and reverse links, and the link corresponding to the side with a lower success rate is a restricted link.

For the situation that the terminal and the base station send packets at the same time, the evaluation is carried out by capturing the data packets sent by the other party and the data packets sent back by the other party. That is, the third embodiment of the present invention as shown in Figure 3 includes:

Step 1, the base station and the terminal send data packets to the opposite end at the same time;

Step II, the base station and the terminal send a return data packet to the opposite end;

Step III, counting the number of data packets sent by the base station and the terminal, counting the number of data packets received by the base station and the terminal; counting the number of return data packets sent by the base station and the terminal, and counting the number of return data packets received by the base station and the terminal;

Step IV, (the number of data packets received by the terminal+the number of returned data packets received by the terminal) ÷ (the number of data packets sent by the base station+the number of returned data packets sent by the base station)×100%=the forward link receives data packets successfully Rate; (the number of data packets received by the base station + the number of returned data packets received by the base station) ÷ (the number of data packets sent by the terminal + the number of returned data packets sent by the terminal) × 100% = success rate of receiving data packets on the reverse link ;

Step V, comparing the numerical values obtained in step IV, wherein the link corresponding to the lower numerical value is the restricted link.

In the third preferred embodiment of the present invention, the calculation of the success rate of receiving data packets is used to determine the restricted link. As described in the second preferred embodiment of the present invention, the calculation of the packet loss rate may also be used to determine the restricted link. The base station and the terminal can send data packets by using a ping command or other methods, which can be understood by those skilled in the art.

For the case where the terminal and the base station do not send packets at the same time, the method of two groups of tests in the third embodiment can be used, or the method of the fourth embodiment shown in FIG. 4 can be used.

The fourth embodiment of the present invention is shown in Fig. 4, comprises:

Step (1), the base station and the terminal successively send data packets to the opposite end;

Step (2), after receiving the above-mentioned data packet, the base station and the terminal send a return data packet to the opposite end;

Step (3), counting the number of data packets sent by the base station or the terminal, and counting the number of data packets received by the base station or the terminal;

Step (4), 1—(the number of data packets received by the terminal ÷ the number of data packets sent by the base station × 100%)=forward link packet loss rate; 1—(the number of data packets received by the base station ÷ the data sent by the terminal Number of packets × 100%) = reverse link packet loss rate;

Step (5), comparing the values obtained in step (4), wherein the link corresponding to the one with the highest packet loss rate is the restricted link.

In the fourth preferred embodiment of the present invention, the calculation of the packet loss rate is used to determine the restricted link. As described in the first preferred embodiment of the present invention, it is also possible to determine the restricted link by calculating the success rate of receiving data packets. The base station and the terminal can send data packets by using a ping command or other methods, which can be understood by those skilled in the art.

Using the above embodiment, it is required that the number of packets sent should reach the number required for statistical significance. For the calculation in the above third embodiment using the number of packets sent by two groups, it is required that the numbers of packets sent by the two groups should be as close as possible, or the number of packets sent at one time with a smaller number of packets should reach the number required for statistical significance.

The fifth embodiment of the present invention is shown in FIG. 5, using a WiMAX network to implement the method proposed by the present invention, including:

1. Select the test route

The goal of this embodiment is to test the coverage of the reverse link before the coverage area, and a drive test is required. The test engineer prepares the test route in advance, and the test route focuses on covering the edge area.

2. Terminal access network

3. Reverse coverage test

The server and the terminal side perform time synchronization.

The terminal initiates a ping packet, the address is the address of the AAA server, the server captures the data packets sent by the terminal, and tests the coverage of the reverse link;

Initiate a ping operation at the starting position of the test route, and test along the test route. The terminal side uses the test software to record GPS position information, send data packet information and time;

4. Forward coverage test

The AAA server initiates a ping packet, the address is the address of the terminal, the terminal captures the data packet sent by the server, and tests the coverage of the forward link;

The server side initiates a ping packet and completes the test along the same route. The terminal side uses the test software to record GPS location information, capture data packet information and time;

5. Test data analysis

For reverse coverage, use time synchronization to map the server captured data packet information obtained in step 3 to the test route, combine the ping packet information initiated by the terminal, and obtain the reverse coverage situation of each test location according to whether the data packet is captured;

For forward coverage, use time synchronization to correspond the information of the ping packet initiated by the server side in step 4 to the test route, combine the terminal to capture the data packet information, and use whether the data packet is captured to obtain the forward coverage of each test location;

According to the coverage of the forward and reverse links, the restricted links at different locations can be evaluated.

Of course, the present invention can also have other embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and All deformations should belong to the protection scope of the claims of the present invention.

Claims (4)

1. the method for detecting limitation link in the wireless communication system comprises:

Packet is sent to the opposite end in step 1, terminal and base station;

Step 2, add up success rate or the packet loss that two links receive packets respectively, judge limitation link;

Wherein, step 1 is specially:

Packet is sent to the opposite end simultaneously or successively in step 1-5, base station and terminal;

After above-mentioned packet is received at step 1-6, base station and terminal, send the return data bag to the opposite end.

2. the method for detecting limitation link is characterized in that in a kind of wireless communication system according to claim 1, successively sends under the situation of packet to the opposite end in base station and terminal, and step 2 is specially:

Quantity of data packets, the quantity of data packets that receive at accounting base-station or terminal are sent in step 2-7, accounting base-station or terminal;

Step 2-8, the data packet number of receiving with the terminal obtain forward link quality divided by base station transmission quantity of data packets; The data packet number that the data packet number of receiving with the base station sends divided by the terminal obtains reverse link circuit quality;

Step 2-9, comparison forward link quality and reverse link circuit quality, wherein receiving the lower link of packet success rate is limitation link.

3. the method for detecting limitation link is characterized in that in a kind of wireless communication system according to claim 1, sends under the situation of packet to the opposite end simultaneously in base station and terminal, and step 2 is specially:

Quantity of data packets, the quantity of data packets that receive at accounting base-station and terminal are sent in step 2-10, accounting base-station and terminal; The return data bag quantity that send at accounting base-station and terminal, the return data bag quantity that receive at accounting base-station and terminal;

The data packet number that the return data bag quantity sum that receive at step 2-11, the data packet number of receiving with the terminal and terminal is sent divided by the base station obtains forward link quality with the return data bag quantity sum of base station transmission; The data packet number that the return data bag quantity sum that receive data packet number of receiving with the base station and base station is sent divided by the terminal obtains reverse link circuit quality with the return data bag quantity sum of terminal transmission;

Step 2-12, comparison forward link quality and reverse link circuit quality, wherein receiving the lower link of packet success rate is limitation link.

4. the method for detecting limitation link is characterized in that in a kind of wireless communication system according to claim 1, in the said step 1, adopts the ping command sending data bag of ICP/IP protocol.

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