WO2009049539A1

WO2009049539A1 - A call method and equipment

Info

Publication number: WO2009049539A1
Application number: PCT/CN2008/072637
Authority: WO
Inventors: Ming Li; Jiang GUO; Guohong Li
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-10-12
Filing date: 2008-10-10
Publication date: 2009-04-23
Also published as: CN101409597A; CN101409597B

Abstract

A call method and equipment are provided in the present invention. The method includes: receiving a voice frame; storing the received even voice frame in a odd period of voice frame when the rate of the received even voice frame is not identical with the rate of previous received voice frame. By using the call method and equipment disclosed in the embodiment of present invention, judge whether the rate of the received even voice frame is identical with the rate of previous received voice frame, the network side detects the rate of received voice frame, if the detected results are not identical, then storing the received even voice frame in a odd period of voice frame, thus the even voice frame is transformed to be a odd voice frame, the network side could send the voice frame to a terminal directly.

Description

Call method and device

The present application claims priority to Chinese Patent Application No. 200710163580.6, entitled "A Talk Method and Apparatus", filed on October 12, 2007, the entire disclosure of which is incorporated herein by reference. Technical field

The present invention relates to the field of communications, and in particular, to a call method and apparatus. Background technique

In the Global System for Mobile communication (GSM), voice communication can be implemented by Adaptive Multi-Rate (AMR) codec service. In a call of adaptive multi-rate codec, the rate can be Adjust according to the situation. For example, the mobile phone adds a Codec Mode Indication (CMI) to the voice frame, and CMI is used to indicate the rate of the voice frame. The mobile phone adds an encoder mode request to the voice frame (Codec Mode) Request, CMR), CM is used to indicate the encoding rate of the peer. In order to reduce the frame length and improve the transmission efficiency, CMI and CM can be transmitted in alternate intervals, such as CMI in the first frame, CMR in the second frame, CMI in the third frame, CMR in the fourth frame, and CMI in the second frame. The default is equal to the CMI of the first frame, and the CMI of the fourth frame is equal to the CMI of the third frame by default, that is, the rate at which the CMR is transmitted is the same as the frame rate of the CMI transmitted in the previous frame.

After the Internet Protocol (IP), the network side transmits the received voice IP packet to the mobile phone, the CMI and the CM are encapsulated in one voice IP packet, and the voice frame between the network side and the mobile phone is adopted. The CMI and the CMR are transmitted in an alternate manner. If the CMI of the voice IP packet received by the network side is different from the CMI of the voice IP packet of the previous frame when the network side sends the CMR to the mobile phone, the network side cannot send the voice frame to Mobile phones, which affect the quality of voice communication, and even interrupt voice communication. Summary of the invention

An object of the embodiments of the present invention is to provide a method and apparatus for calling, which implements reliable transmission of voice and improves the quality of voice communication. The embodiment of the invention provides a method for calling, the method comprising:

Receiving a speech frame;

When the rate of the received even speech frame does not coincide with the rate of the previously received speech frame, the received even speech frame stores the odd duration of the speech frame.

The embodiment of the invention further provides a device for talking, the device comprising:

a receiving unit, configured to receive a voice frame;

a determining unit, configured to determine whether a rate of the even-numbered voice frames in the voice frame received by the receiving unit is consistent with a rate of the previously received voice frame;

And a storage unit, configured to: when the determining unit determines that the result is inconsistent, store the received even-numbered voice frames for an odd duration of the voice frame.

In the background, if the rate of receiving the even-numbered voice frame is inconsistent with the rate of the previous received voice frame, the network side cannot transmit the voice frame, and the call method and apparatus according to the embodiment of the present invention receive an even-numbered voice frame. When the rate of the received speech frame is inconsistent with the rate of the previous received speech frame, the even-numbered speech frame received by the network side stores the odd duration of the speech frame, so that the even-numbered speech frame is stored and converted into an odd-numbered speech frame, and the network side can directly The odd voice frames are sent to the terminal, thereby realizing reliable transmission of voice and improving the quality of voice communication. DRAWINGS

1 is a schematic flow chart of Embodiment 1 of a call method according to the present invention;

2 is a schematic structural diagram of an embodiment of a device for talking in the present invention. detailed description

Embodiment 1 discloses a call method. Referring to FIG. 1, the method includes:

101. Receive a voice frame.

102. Determine whether the rate of receiving the even-numbered speech frame is consistent with the rate of the previous received speech frame. The frame number and rate of the received speech frame may be recorded. If the frame number of the speech frame is an even number, compare the speech frame. Whether the rate is consistent with the rate of the previous received speech frame.

It is also possible to determine whether the rate of receiving the even-numbered speech frame and the rate of the previous received speech frame are one by determining the frame difference between the voice frame number sent in the uplink and the voice frame number corresponding to the downlink. To:

If the even-numbered speech frame sent by the uplink is inconsistent with the previous transmitted speech frame rate, and the frame difference between the uplink transmitted speech frame number and the corresponding downlink received speech frame number is an odd number, the rate of receiving the even-numbered speech frame is determined. The rate at which the previous received voice frame was inconsistent;

Or, if the odd-numbered voice frame sent by the uplink is inconsistent with the previous transmitted voice frame rate, and the frame difference between the uplink-transmitted voice frame number and the corresponding downlink-received voice frame number is an even number, it is determined that the even-numbered voice frame is received. The rate does not match the rate at which the previous received speech frame was received.

The method for determining the frame difference between the voice frame number sent by the uplink and the voice frame number received by the downlink may be:

Detecting the condition of the channel, that is, detecting the delay of the channel;

The frame difference between the voice frame number sent by the uplink and the voice frame number received by the downlink is determined according to the delay condition of the channel.

103. If not, the received even speech frame stores the odd duration of the speech frame. In the background, if the rate of receiving the even-numbered voice frame is inconsistent with the rate of the previous received voice frame, the network side cannot transmit the voice frame, which may cause the voice call to be interrupted, and the call method and apparatus disclosed in the embodiment of the present invention are used. The network side detects whether the rate of receiving the even-numbered speech frame is consistent with the rate of the previous received speech frame, and detects the rate of the received speech frame. If not, the received even-numbered speech frame stores the odd duration of the speech frame. In this way, the even-numbered speech frame is stored and converted into an odd-numbered speech frame, and the network side can directly transmit the odd-numbered speech frame to the terminal, thereby realizing reliable transmission of the voice and improving the quality of the voice communication.

Preferably, the even-numbered speech frame stores a frame length of one speech frame, and the frame length of one speech frame is twenty milliseconds, and the speech frame is delayed by twenty milliseconds, and the user who uses the voice call can hardly feel the delay. Therefore, there is no influence on the call quality, and reliable transmission of voice is realized. The second embodiment, the call method disclosed in the first embodiment can be applied to the variable rate voice communication. In this embodiment, the call method disclosed in the first embodiment is applied to the adaptive multi-rate codec of the global mobile communication system. In the voice communication, the odd length of the stored voice frame is the frame length of one voice frame. In this embodiment, the frame length of a voice frame is twenty milliseconds. The call method in this embodiment includes: 1. determining the voice frame number sent by the uplink. The frame difference between the voice frame number corresponding to the downlink reception: The base station receives the voice frame of the mobile phone uplink or system downlink, and reserves a buffer of twenty milliseconds in the place where the base station receives the downlink voice frame of the system, that is, reserves a frame of the voice frame; when the voice channel is established, the base station Send CMR to the system uplink, and send the rule to two frames as an example. The first, third, fifth... frame time corresponds to the CMR frame time received from the mobile phone uplink, marked as odd (0) frame time, second, fourth The sixth frame time corresponds to the CMI frame time received from the mobile phone uplink, and is marked as an even (E) frame time. Two rates, for example, 7.4K and 6.7K, are selected, and the transmission is performed alternately, that is, the first and second frame rates are 7.4k, the third and fourth frame rate is 6.7k, and the fifth and sixth frame rates are 7.4k. After receiving the CMR request from the base station, the system will change the coding rate to the base station, that is, change the system direction. CMI of the downlink voice frame of the base station.

After the base station sends a regularly changing CMR to the system, it starts monitoring the downlink received from the system.

CMI changes, and make corresponding judgments:

The base station determines whether the voice frame CMI currently received by the system is consistent with the received voice frame CMI of the previous frame, if the frame number of the currently received voice frame is an odd number, and the currently received voice frame CMI and the previous frame If the CMIs of the received voice frames are inconsistent, the frame difference caused by the delay of the voice channel is even, and if it is consistent, the frame difference is an odd number.

Or, if the frame number of the currently received voice frame is an even number, and the currently received voice frame CMI is inconsistent with the received voice frame CMI of the previous frame, the frame difference caused by the voice channel delay is an odd number, and vice versa. Consistent, the frame difference is even.

2. It is determined whether the rate of receiving the even-numbered voice frames is consistent with the rate of the previous received voice frame: if the even-numbered voice frames sent by the base station to the system are inconsistent with the previously transmitted voice frame rate, and the voice frame number sent in the uplink is Corresponding to the odd number between the received speech frame numbers from the system, it is determined that the rate of receiving the received speech frames is inconsistent with the rate of the previous received speech frame;

Or, if the odd-numbered voice frame sent by the base station to the system is inconsistent with the previous transmitted voice frame rate, and the frame difference between the uplink-transmitted voice frame number and the corresponding received voice frame number from the system downlink is even, then the determination is received. The rate of the even speech frame is inconsistent with the rate of the previous received speech frame.

3. If they are inconsistent, store the even-numbered speech frames to store the odd-numbered duration of the speech frame: If the rate of receiving the even-numbered speech frames from the system does not match the rate of the previous received speech frame, put the even-numbered speech frames into the slower a buffer buffer, the buffer is used to store the odd time frame of the voice frame, and the base station sends the corresponding odd number of empty frames to the mobile phone, thereby making the even language The audio frame is converted to an odd voice frame.

With the call method of the embodiment of the present invention, an even-numbered speech frame whose rate changes can be converted into an odd-numbered speech frame to ensure normal operation of the voice communication.

This embodiment also discloses a device for talking. Referring to FIG. 2, the device includes:

The receiving unit 201 is configured to receive a voice frame.

The determining unit 202 is configured to determine whether the rate of the even-numbered voice frames in the voice frame received by the receiving unit is consistent with the rate of the previously received voice frame;

The storage unit 203 is configured to: when the determining unit 202 determines that the result is inconsistent, store the received even-numbered speech frames for an odd duration of the speech frame.

The device of the call may further include:

a detecting unit, configured to detect a channel condition;

And a frame difference unit, configured to determine, according to the detection result of the detecting unit, a frame difference between the voice frame number sent by the uplink and the voice frame number corresponding to the downlink.

The determining unit may include:

a first module, configured to: when an even-numbered voice frame sent in the uplink is inconsistent with a previously transmitted voice frame rate, and the frame difference determined by the frame difference unit is an odd number, determine a rate at which the even-numbered voice frame is received and the previous received The rate of the voice frames is inconsistent; or,

a second module, configured to: when an odd voice frame sent in the uplink is inconsistent with a previously transmitted voice frame rate, and the frame difference determined by the frame difference unit is an even number, determine a rate at which an even voice frame is received and a previous reception The rate to the speech frame is inconsistent.

The device of the call can be applied in variable-rate voice communication, set on the network side, can be set in the base station, or can be set in the gateway, or can be used as an independent device to cooperate with the base station or the gateway to implement variable-rate voice. Reliable operation of communications.

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 hardware platform, and of course, all can be implemented by hardware. Based on such understanding, all or part of the technical solution of the present invention contributing to the background art may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM, a magnetic disk, an optical disk, or the like. Including a number of instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform various embodiments or embodiments of the present invention Some of the methods described.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is considered as the scope of protection of the present invention.

Claims

Rights request

A call method, characterized in that the method comprises:

Receiving a speech frame;

2. The method according to claim 1, wherein the method further comprises: detecting a channel condition;

And determining, according to the detection result, a frame difference between the voice frame number sent by the uplink and the voice frame number received by the downlink.

The method according to claim 2, wherein the rate of the received even-numbered speech frames is different from the rate of the previously received speech frame, including:

If the even-numbered speech frame sent by the uplink does not match the previous transmitted speech frame rate, and the frame difference is an odd number, the rate of the received even-numbered speech frame does not match the rate of the previous received speech frame; or

If the odd-numbered speech frames sent in the uplink do not coincide with the previously transmitted speech frame rate, and the frame difference is even, the rate of the received even-numbered speech frames does not match the rate of the previous received speech frame.

4. The method according to claim 1, wherein the odd duration is a frame length of a speech frame.

5. A device for talking, characterized in that the device comprises:

a receiving unit, configured to receive a voice frame;

The device according to claim 5, further comprising: a detecting unit, configured to detect a channel condition;

And a frame difference unit, configured to determine, according to the detection result of the detecting unit, a frame difference between the uplink frame number and the corresponding downlink frame number.

The device according to claim 6, wherein the determining unit comprises: a first module, configured to: when an even-numbered speech frame sent in the uplink is inconsistent with a previously transmitted speech frame rate, and the frame difference unit When the determined frame difference is an odd number, it is judged that the rate of receiving the even-numbered speech frame is inconsistent with the rate of the previous received speech frame; or

The device according to any one of claims 5 to 7, characterized in that the call device is integrated in a base station or a gateway.