WO2011153903A1

WO2011153903A1 - Method and device for adjusting adaptive multi-rate voice coding rate at internet protocol interface

Info

Publication number: WO2011153903A1
Application number: PCT/CN2011/074694
Authority: WO
Inventors: 张纲; 卢勤博; 杨锋; 姚幸林; 郭红波
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-10
Filing date: 2011-05-26
Publication date: 2011-12-15
Also published as: CN102281253A

Abstract

The present invention provides a method for adjusting an Adaptive Multi-Rate (AMR) voice coding rate at an Internet Protocol(IP) interface, the method includes: an IP network quality measurement unit acquires an IP network transmission quality parameter Qip by measuring IP network transmission quality; an air-interface quality measurement unit acquires an air-interface quality parameter Qum by measuring air-interface uplink and downlink transmission quality; an AMR voice coding rate adjustment unit adjusts the AMR voice coding rate in accordance with the air-interface quality parameter Qum and the IP network transmission quality parameter Qip. The present invention also provides a device for adjusting the AMR voice coding rate at the IP interface, and the IP transmission quality measurement and the AMR voice coding technology are incorporated in the present invention, the AMR voice coding rate is adjusted according to the IP transmission quality, and the transmission rate at the IP interface can be optimized in order to achieve the purpose of improving overall voice quality of GSM.

Description

IP interface AMR speech coding rate adjustment method and device

The present invention relates to the field of communications, and in particular, to an Internet Protocol (IP, Internet Protocol) IP interface adaptive multi-rate (AMR) voice coding rate adjustment method and apparatus. Background technique

In the evolution of the network side interface, the GSM system gradually adopts the IP Abis interface. When the IP interface is used in the GSM system, especially the IP-based Abis interface, the IP interface has a certain impact on the quality of the voice transmission due to the sensitive characteristics such as bandwidth, jitter, and packet loss, resulting in poor voice quality.

At present, the AMR speech coding methods used by the Global System for Mobile Communications (GSM) are based on the quality of the air interface (Um) to adjust the speech coding rate to ensure the voice quality of the air interface transmission, and the network side transmission is not optimized. . Although the network side of the IP interface uses anti-jitter, retransmission and other methods to ensure voice transmission performance, but does not take measures in the source coding.

The patent document CN200580040685.1 proposes a system and method for improving the audio quality of an IP-based system using the AMR payload format, according to the Real-Time Transport Protocol (RTP), the buffer congestion condition is compared with the threshold, and the AMR is lowered beyond the threshold. The speech coding rate, if the rate is the lowest, replaces the speech frame with a Nodata frame. The solution disclosed in this patent only uses the congestion state of the transmission buffer to control the AMR speech coding rate, and has no mechanism for other parameters of the IP network, such as packet loss and delay measurement, and cannot perform the AMR rate according to the actual environment change of the network. Adjustment.

Patent document CN200710073277 proposes an adaptive multi-rate packet speech coding mode adjustment method and a base station controller, which are based on the interface load and load of the base station controller and the base station. The threshold is set to adjust the AMR rate, but the AMR rate is not adjusted for the measured IP interface quality. When multiple Abiss access the IP network, the same IP interface load threshold is used for different base stations. Some base stations reach a wide value and other base stations have a small load. In this case, the solution can only reach a threshold. The AMR rate adjustment of the base station causes different AMR rates of the base stations, which is disadvantageous for dynamically sharing the entire IP network resources between the base stations, thereby failing to fully utilize the network resources. Summary of the invention

The object of the present invention is to provide an IP interface AMR speech coding rate adjustment method, which can adjust the AMR speech coding rate by using the IP interface network quality, and improve the transmission quality of the IP network.

Another object of the present invention is to provide an IP interface AMR speech coding rate adjustment apparatus capable of adjusting an AMR speech coding rate by using an IP interface network quality, and improving an IP network transmission quality.

According to an aspect of the present invention, an IP interface AMR speech coding rate adjustment method is provided, including the following steps:

The IP network quality measurement unit obtains the IP network transmission quality parameter Qip by measuring the transmission quality of the IP network;

The air interface quality measuring unit obtains the air interface quality parameter Qum by measuring the uplink and downlink transmission quality of the air interface;

The AMR speech coding rate adjustment unit adjusts the AMR speech coding rate according to the air interface quality parameter Qum and the IP network transmission quality parameter Qip.

The AMR speech coding rate adjustment unit is configured with a plurality of air interface AMR speech coding rate adjustment thresholds corresponding to a plurality of different AMR speech coding rates, and the AMR speech coding rate adjustment unit and the air interface quality parameter Qum The AMR speech coding rate corresponding to the corresponding air interface AMR speech coding rate adjustment threshold is determined as the AMR initial speech coding rate.

The AMR speech coding rate adjustment unit adjusts the AMR speech coding rate according to the IP network transmission quality parameter Qip after determining the initial speech coding rate of the AMR. The AMR voice coding rate adjustment unit is further configured with an IP network quality low threshold and an IP network quality high threshold. When the IP network transmission quality parameter Qip is greater than or equal to the IP network quality low threshold, the AMR voice is The coding rate adjustment unit down-modulates the AMR speech coding rate; and, when the IP network transmission quality parameter Qip is less than the IP network quality high threshold, the AMR speech coding rate adjustment unit increases the AMR speech coding rate.

The IP network transmission quality parameter Qip, the IP network quality low threshold, and the IP network quality high threshold all include a packet loss parameter and a delay parameter.

The AMR speech coding rate adjusting unit determines to lower the AMR when any one or two of the packet loss parameter and the delay parameter in the IP network transmission quality parameter Qip are greater than or equal to the corresponding parameter of the IP network quality low threshold. a voice coding rate; when the packet loss parameter and the delay parameter of the IP network transmission quality parameter Qip are both smaller than the corresponding parameters of the IP network quality high threshold, the AMR speech coding rate adjustment unit determines to increase the AMR speech coding rate.

After determining the AMR speech coding rate, the AMR speech coding rate adjustment unit determines whether the current AMR speech coding rate is lower than the AMR speech coding corresponding to the air interface AMR speech coding rate adjustment threshold corresponding to the current air interface quality parameter Qum. Rate, if yes, up-modulate the AMR speech coding rate; if not, the AMR speech coding rate is not adjusted.

According to another aspect of the present invention, an IP interface AMR speech coding rate adjustment apparatus is provided, the apparatus comprising:

An IP network quality measuring unit, configured to measure an IP network transmission quality, and obtain an IP network transmission quality parameter Qip;

The air interface quality measuring unit is configured to obtain the air interface quality parameter Qum by measuring the uplink and downlink transmission quality of the air interface;

The AMR voice coding rate adjustment unit is configured to adjust the AMR voice coding rate according to the air interface quality parameter Qum and the network transmission quality parameter Qi. Wherein, the apparatus of the present invention further comprises a network interface for connecting to the IP network and/or an air interface for communicating with the mobile network.

The AMR speech coding rate adjustment unit is configured with a plurality of air interface AMR speech coding rate adjustment thresholds corresponding to a plurality of different AMR speech coding rates, where the AMR speech coding rate adjustment unit is further configured to be used with the air interface. The AMR speech coding rate corresponding to the air interface AMR speech coding rate adjustment threshold corresponding to the quality parameter Qum is determined as the AMR initial speech coding rate.

The AMR speech coding rate adjustment unit is further configured to: after determining the initial speech coding rate of the AMR, adjust an AMR speech coding rate according to the IP network transmission quality parameter Qip.

Compared with the prior art, the present invention has the following advantages: the AMR speech coding rate is adjusted according to the IP network transmission quality, and the disadvantages of the IP link transmission control and the AMR speech coding rate adjustment in the prior art are overcome, and the existing solution is solved. There is a problem in the technology that the voice quality of IP link cannot be controlled.

In addition, the present invention combines IP transmission quality measurement and AMR speech coding technology to adjust the AMR speech coding rate according to the IP transmission quality, and optimizes the IP interface transmission rate to achieve the goal of improving the overall GSM voice quality. When the network transmission quality is high, the speech coding and decoding speech coding rate is improved within the range allowed by the air interface quality, and the speech codec quality is improved. When the network quality is poor, the speech coding and decoding speech coding rate is reduced, the network load is reduced, the transmission reliability is improved, and the speech quality is finally improved. DRAWINGS

1 is a schematic structural diagram of an IP interface AMR speech coding rate adjusting apparatus of the present invention;

2 is a schematic flowchart of an implementation process of an AMR voice coding rate adjustment method for an IP interface according to the present invention; 3 is a flow chart of a specific example of an IP interface AMR speech coding rate adjustment method of the present invention. detailed description

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

1 is an IP interface AMR voice coding rate adjustment apparatus 1 of the present invention. As shown in FIG. 1, the IP interface AMR voice coding rate adjustment apparatus 1 of the present invention includes: an IP network quality measurement unit 12, and an AMR voice coding rate adjustment unit 13. And an air quality measuring unit 14, wherein

An IP network quality measuring unit 12, configured to measure an IP network transmission quality, and obtain an IP network transmission quality parameter Qip;

The air interface quality measuring unit 14 obtains the air interface quality parameter by measuring the uplink and downlink transmission quality of the air interface;

The AMR speech coding rate adjustment unit 13 adjusts the AMR speech coding rate according to the air interface quality parameter Qum obtained by the air interface quality measurement unit 14 and the IP network transmission quality parameter Qip obtained by the IP network quality measurement unit 12.

As shown in Fig. 1, the IP interface AMR speech coding rate adjusting apparatus 1 of the present invention further comprises: a network interface 11 connected to the IP network and/or an air interface (hereinafter referred to as an air interface) communicating with the mobile network.

Also shown in FIG. 1 is a speech rate adaptation unit 2 connected between the network interface 11 and the air interface 15, the speech rate adaptation unit 2 for converting the data format between the network interface 11 and the air interface 15, in addition, voice The rate adaptation unit 2 also sends the adjusted speech coding rate of the AMR speech coding rate adjustment unit 13 to the air interface 15 so that the speech codec of the air interface 15 performs the coding and decoding operation according to the adjusted speech coding rate.

Specifically, the AMR speech coding rate adjustment unit is configured with a plurality of air interface AMR speech coding rate adjustment thresholds corresponding to multiple different AMR speech coding rates, the AMR The speech coding rate adjustment unit is further configured to determine an AMR speech coding rate corresponding to the air interface AMR speech coding rate adjustment threshold corresponding to the air interface quality parameter Qum as an AMR initial speech coding rate.

Here, the AMR speech coding rate adjustment unit is further configured to adjust an AMR speech coding rate according to the IP network transmission quality parameter Qip after determining an initial speech coding rate of the AMR.

2 is a flowchart of implementing an AMR voice coding rate adjustment method for an IP interface according to the present invention. As shown in FIG. 2, the method for adjusting an AMR voice coding rate of an IP interface includes:

The IP network quality measuring unit 12 obtains the IP network transmission quality parameter Qip by measuring the transmission quality of the IP network;

The air interface quality measuring unit 14 obtains the air interface quality parameter Qum by measuring the uplink and downlink transmission quality of the air interface;

The AMR speech coding rate adjustment unit 13 adjusts the AMR speech coding rate based on the air interface quality parameter Qum and the IP network transmission quality parameter Qi.

The AMR speech coding rate adjusting unit 13 is configured with a plurality of different air interface AMR speech coding rate adjustment thresholds and a plurality of different AMR speech coding rates corresponding to the plurality of air interface AMR speech coding rate adjustment thresholds. A plurality of different AMR speech coding rates constitute an AMR speech coding rate set, and the AMR speech coding rate adjustment unit 13 selects AMR speech coding rate concentration and air interface AMR speech coding according to the correspondence between the air interface quality parameter Qum and the air interface AMR speech coding rate adjustment threshold. The AMR speech coding rate corresponding to the rate adjustment threshold.

It is assumed that four air interface AMR speech coding rate adjustment thresholds and four AMR speech coding rates corresponding thereto are configured. If the current air interface quality parameter Qum corresponds to the first air interface AMR speech coding rate adjustment threshold, the AMR speech coding rate adjustment is performed. Unit 13 selects (or adjusts to) the first AMR speech coding rate corresponding to the first air interface AMR speech coding rate adjustment threshold. Here, the AMR speech coding rate adjustment unit determines the AMR speech coding rate corresponding to the air interface AMR speech coding rate adjustment threshold corresponding to the air interface quality parameter Qum as the AMR initial speech coding rate. Each of the air interface AMR voice coding rate adjustment thresholds includes an upper threshold and a lower threshold. When the air interface quality parameter Qum is between an upper threshold and a lower threshold of the adjustment threshold, the air quality parameter Qum corresponds to the threshold.

In the above apparatus and method, after determining the initial speech coding rate of the AMR, the AMR speech coding rate adjustment unit adjusts the AMR speech coding rate according to the IP network transmission quality parameter Qip.

The AMR voice coding rate adjustment unit 13 is further configured with an IP network quality low threshold and an IP network quality high threshold. When the IP network transmission quality parameter Qip is greater than or equal to the IP network quality low threshold, the AMR speech coding rate adjustment unit is down-regulated. The AMR speech coding rate, and when the IP network transmission quality parameter Qip is lower than the IP network quality high threshold, the AMR speech coding rate adjustment unit increases the AMR speech coding rate.

The IP network transmission quality, the IP network quality low threshold, and the IP network quality high threshold of the present invention both include packet loss parameters and delay parameters.

When any one or two of the packet loss parameter and the delay parameter in the IP network transmission quality parameter are greater than or equal to the corresponding parameter of the IP network quality low threshold, indicating that the IP network transmission quality is poor, the AMR speech coding rate adjustment unit at this time It will be determined to down-regulate the AMR speech coding rate to accommodate poor IP network transmission quality.

When the packet loss parameter and the delay parameter in the IP network transmission quality parameter are both smaller than the corresponding parameters of the IP network quality high threshold, indicating that the IP network transmission quality is good, the AMR speech coding rate adjustment unit determines to adjust the AMR speech coding rate. In order to adapt to the quality of good IP network transmission.

In addition, after determining that the AMR speech coding rate is adjusted, the AMR speech coding rate adjustment unit determines whether the current AMR speech coding rate is lower than the current air interface quality parameter Qum. The AMR speech coding rate, that is, the AMR speech coding rate corresponding to the air interface AMR speech coding rate adjustment threshold corresponding to the current air interface quality parameter Qum, if yes, the AMR speech coding rate is raised; if not, the uplink coding rate is not raised. AMR speech coding rate.

The GSM system of the IP Abis interface is taken as an example to further describe the AMR voice speech coding rate adjustment method and apparatus of the IP interface according to the present invention:

1) Configure the AMR speech coding rate set N[4]=12.2, N[3]= 10.2, N[2]= 7.95, N[l]= 7.4, ie the AMR speech coding rate set includes 4 from high to low. AMR speech coding rate N[4] to N[l], and configuring the air interface AMR speech coding rate adjustment threshold corresponding to each speech coding rate Tum[4] = {11, }, Tum[3] = {10 , 13 }, Tum[2] = {9,12}, Tum[l] = {8,10}, the air quality threshold is set to dB according to the carrier-to-interference ratio, and each threshold includes a down threshold and an upper threshold. The air interface AMR speech coding rate adjustment threshold corresponding to the highest AMR speech coding rate only needs to include a downward threshold, for example, Tum[4] = {11, } corresponding to N[4]=12.2.

Configure the IP port quality threshold, including the delay and packet loss threshold, expressed as {delay (in milliseconds), packet loss (packet loss rate *100) }. The low threshold Tipl = {200, 5 } , the high threshold Tip2 = { 100, 1 } ; If any one or two of the IP interface quality parameters Qip is greater than or equal to the corresponding parameter in the Tipl, it means that the AMR speech coding rate needs to be lowered, if The IP interface quality parameter Qi is smaller than all the parameters in Tip2, indicating that the AMR speech coding rate can be improved;

2) The air interface quality measurement unit measures the air interface quality parameter Qum is 10<Qum<13, and determines the air interface quality parameter Qum corresponds to the air interface AMR speech coding rate adjustment threshold Tum[3] =

{ 10,13 } , thus the AMR speech coding rate adjustment unit sets the AMR speech coding rate Num = N[3] according to the air interface quality parameter Qum.

3) The IP interface quality measurement parameter of the IP interface measurement unit is: Qlost = 5% packet loss rate, Qdelay = 200 milliseconds (ms), etc., and the IP interface quality parameter Qip is equal to the low threshold, and the IP interface is comprehensively obtained. The quality satisfies the condition of down-regulating the AMR speech coding rate. 4) The AMR speech coding rate adjustment unit determines whether to adjust the AMR speech coding rate Num according to the IP interface quality parameter Qi and the low threshold, and comprehensively obtains that the IP interface quality satisfies the condition of down-modulating the AMR speech coding rate, and then lowers the AMR speech. The coding rate is Nip=Num-l; Nip = N[2].

FIG. 3 shows a specific process of implementing the AMR voice coding rate adjustment method of the IP interface of the present invention, where the process includes:

Step 301, start;

Step 302: Configure an AMR speech coding rate set that includes multiple AMR speech coding rates. Step 303: Measure an air interface quality, and determine an AMR initial speech coding rate according to the air interface quality.

Step 304: Measure the transmission quality of the IP network, that is, measure the quality of the IP interface.

Step 305, according to the IP interface quality, determine whether to down-regulate the AMR speech coding rate, if it is determined that the AMR speech coding rate needs to be down-regulated, go to step 306, if it is determined that the AMR speech coding rate does not need to be down-regulated, then go to step 309;

Step 306, determining whether the current AMR speech coding rate is less than the lowest speech coding rate in the AMR speech coding rate concentration. If yes, go to step 307, no adjustment is made. If no, go to step 308 to lower the AMR speech coding rate.

Step 309, it is determined whether the AMR speech coding rate is up-regulated, if yes, go to step 310, if no, go to step 303;

Step 310: Determine whether the current AMR speech coding rate is lower than the AMR speech coding rate corresponding to the current air interface quality. If yes, go to step 311 to increase the AMR speech coding rate. If no, go to step 312, and do not adjust the AMR. Speech coding rate; After performing the steps of up-adjusting the AMR speech coding rate, down-regulating the AMR speech coding rate, or not adjusting the AMR speech coding rate, the process proceeds to step 313.

In summary, due to the quality of the IP network transmission considered by the AMR speech coding rate of the present invention, Therefore, the reliability of voice data transmission when the GSM network uses the IP link is optimized, and the overall voice quality of the network is improved.

In addition, the invention improves the speech coding and decoding speech coding rate and improves the speech coding and decoding quality within the range allowed by the air interface quality when the network transmission quality is high. When the network quality is poor, the speech coding and decoding speech coding rate is reduced, the network load is reduced, the transmission reliability is improved, and the speech quality is finally improved.

Although the invention has been described in detail above, the invention is not limited thereto, and various modifications may be made by those skilled in the art in accordance with the principles of the invention. Therefore, modifications made in accordance with the principles of the present invention should be construed as falling within the scope of the present invention.

Claims

Claim

An IP interface AMR voice coding rate adjustment method, characterized in that the method comprises the following steps:

2. The method according to claim 1, wherein the AMR speech coding rate adjustment unit configures a plurality of air interface AMR speech coding rate adjustment thresholds corresponding to a plurality of different AMR speech coding rates, the AMR speech The coding rate adjustment unit determines the AMR speech coding rate corresponding to the air interface AMR speech coding rate adjustment threshold corresponding to the air interface quality parameter Qum as the AMR initial speech coding rate.

The method according to claim 2, wherein the AMR speech coding rate adjustment unit adjusts the AMR speech coding rate according to the IP network transmission quality parameter Qi after determining the initial speech coding rate of the AMR.

The method according to claim 3, wherein the AMR voice coding rate adjustment unit further configures an IP network quality low threshold and an IP network quality high threshold, where the IP network transmission quality parameter Qi is greater than or equal to When the IP network quality low threshold is used, the AMR voice coding rate adjustment unit adjusts the AMR voice coding rate; and when the IP network transmission quality parameter Qip is smaller than the IP network quality high threshold, the AMR voice coding rate is adjusted. The unit up-regulates the AMR speech coding rate.

The method according to claim 4, wherein the IP network transmission quality parameter Qip, the IP network quality low threshold, and the IP network quality high threshold all include a packet loss parameter and a delay parameter. Number.

The method according to claim 5, wherein any one or two of the packet loss parameter and the delay parameter in the IP network transmission quality parameter Qip are greater than or equal to a corresponding parameter of the IP network quality low threshold. The AMR speech coding rate adjustment unit determines to lower the AMR speech coding rate; when the packet loss parameter and the delay parameter of the IP network transmission quality parameter are both smaller than the corresponding parameters of the IP network quality high threshold, the AMR speech The coding rate adjustment unit determines to increase the AMR speech coding rate.

The method according to claim 6, wherein the AMR speech coding rate adjustment unit determines whether the current AMR speech coding rate is lower than the current air interface quality parameter Qum after determining to adjust the AMR speech coding rate. The AMR speech coding rate corresponding to the air interface AMR speech coding rate adjustment threshold, if yes, the AMR speech coding rate is adjusted; if not, the AMR speech coding rate is not adjusted.

8. An IP interface AMR speech coding rate adjustment apparatus, wherein the apparatus comprises:

The AMR speech coding rate adjustment unit adjusts the AMR speech coding rate according to the air interface quality parameter Qum and the network transmission quality parameter Qip.

9. Apparatus according to claim 8, characterized in that the apparatus further comprises a network interface for connecting to the IP network and/or an air interface for communicating with the mobile network.

The apparatus according to claim 8 or 9, wherein the AMR speech coding rate adjustment unit is configured with a plurality of air interface AMR speech coding rate adjustment thresholds corresponding to a plurality of different AMR speech coding rates, The AMR speech coding rate adjustment unit is also used for The AMR speech coding rate corresponding to the air interface AMR speech coding rate adjustment threshold corresponding to the air interface quality parameter Qum is determined as the AMR initial speech coding rate.

The apparatus according to claim 10, wherein the AMR speech coding rate adjustment unit is further configured to: after determining an initial speech coding rate of the AMR, adjust an AMR speech according to the IP network transmission quality parameter Qi Coding rate.