WO2009000208A1

WO2009000208A1 - Multicast service information transmission method, multicast service implement method, base station, relay station, and terminal

Info

Publication number: WO2009000208A1
Application number: PCT/CN2008/071443
Authority: WO
Inventors: Lian Yang; Xiaojing Zhang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-06-27
Filing date: 2008-06-26
Publication date: 2008-12-31
Also published as: CN101335906B; CN101335906A

Abstract

A method for performing the multicast service is provided, the method includes: encoding multicast service information to be transmitting so as to obtain a first information code flow and a second information code flow; transmitting the first information code flow by a base station, receiving the first information code flow by a relay station; transmitting the second information code flow by the base station, transmitting the received first information code flow by the relay station at the same time; obtaining the first information code flow by a terminal, so as to realize multicast service. A multicast service information transmission method, base station, relay station and terminal are also provided.

Description

Multicast service information transmitting method, multicast service implementing method, and base station, relay station, terminal

The present invention relates to the field of communications, and in particular, to a method for transmitting multicast service information, a method for implementing a multicast service, and a base station, a relay station, and a terminal.

Background technique

With the development of communication technologies, a large number of multimedia services are emerging. These multimedia services are large in data transmission, long in duration, and sensitive to delay. In order to effectively utilize mobile network resources, various standardization organizations have proposed the concept of broadcast and multicast services, such as: Multimedia broadcast and multicast services proposed in the 3rd Generation Partnership Project (3GPP) organization ( Multimedia Broadcast and Multicast Service, MBMS); Broadcast and Multicast Service (BCMCS) proposed in the 3rd Generation Partnership Project (3GPP2) organization; proposed in IEEE 802.16e organization Broadcast Multicast Service (MBS), etc. This type of multicast service refers to a point-to-multipoint service in which a data source sends data to multiple users, and realizes network resource sharing, including mobile core network and access network resource sharing, especially air interface resources. These multicast services not only implement plain text low-rate message-like multicast and broadcast, but also achieve high-rate multimedia service multicast and broadcast. In general, a high-speed multimedia service needs to be coded into a code stream. The so-called code stream is a binary data stream formed by specifically encoding a video, audio, and the like in order to adapt to the transmission of the digital communication system.

In the prior art, referring to FIG. 1, the implementation method of the multicast service is: First, the system performs multi-bit rate coding on the to-be-transmitted service information, obtains a basic information code stream for implementing the multicast service, and at least one is used for An enhanced information code stream that improves the quality of the service, where the basic information code stream implements a basic multicast service, and the enhanced information code stream cannot implement the multicast service separately. Then, the system delivers the basic information code stream through the low-rate physical channel, so that the basic information code stream covers the entire cell; the system sends the enhanced information code stream to the higher-rate physical channel to enable the user with better channel conditions. An enhanced information stream can be received. Finally, the user obtains the basic information code stream to implement the multicast service, where the basic information code stream is generally composed of one information code stream; the user obtains the enhanced information code stream, and enhances the information code stream in the basic information code stream. On the basis of optimizing the multicast service of the cell, a better multicast service can be realized. The enhanced information code stream typically includes at least one information code stream, and the same information code stream is sent over a physical channel having the same rate.

In the wireless communication system, in order to solve the coverage problem of the base station, it is generally required to use the relay station to enhance the infinite communication signal between the base station and the end user. However, there is no mature method for implementing multicast through the relay station, therefore, In order to enable the relay station to implement multicast services, the transmission of information needs to be divided into two phases: the content that the relay needs to broadcast is transmitted to the relay station, and the relay station caches the content in its downlink data buffer, and the transmission mode may be broadcast or dedicated. channel;

In the second phase, in order to avoid mutual interference between different base stations and relays in the multicast service, the base station and the relay station need to simultaneously broadcast the same content on the same time-frequency resource block, so that the users under the coverage can receive normally. To the multicast business.

In the process of implementing the present invention, the inventor has found that in the implementation method of the multicast service in the prior art, the relay technology is not considered. Therefore, it is difficult to apply the multicast service to the system in which the relay station exists. At the same time, the characteristics of the extended coverage of the relay station cannot be fully utilized. Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a method for transmitting multicast service information, a method for implementing a multicast service, a base station, a relay station, and a terminal, and realizing a better combination of a multicast service and a relay system.

In order to achieve the above objectives, an embodiment of the present invention provides a method for transmitting multicast service information, including:

Encoding the to-be-transmitted service information to obtain a first information code stream and a second information code stream; The base station sends the first information code stream, the relay station receives the first information code stream sent by the base station, the base station sends the second information code stream, and the relay station simultaneously sends the received first information code stream.

In order to achieve the above objectives, an embodiment of the present invention provides a method for implementing a multicast service, including:

Encoding the service information to obtain the first information code stream and the second information code stream; the base station transmitting the first information code stream, the relay station receiving the first information code stream sent by the base station; a second information stream, the relay station simultaneously transmitting the received first information code stream;

The terminal acquires the first information code stream to implement the multicast service.

In order to achieve the above objective, an embodiment of the present invention provides a base station, including: a coding unit and a sending unit;

The coding unit is configured to encode the service information to be sent, to obtain a first information code stream and a second information code stream;

The sending unit is configured to send the first information code stream obtained by the coding unit to a relay station and/or a terminal, and send the second information code stream obtained by the coding unit to a terminal.

In order to achieve the above object, an embodiment of the present invention provides a relay station, including: a receiving unit, configured to receive a first information code stream sent by a base station;

And a sending unit, configured to send, when the base station sends the second information code stream, the first information code stream received by the receiving unit.

In order to achieve the above objectives, an embodiment of the present invention provides a terminal, including:

a receiving unit, configured to receive the first information code stream and the second information code stream;

a processing unit, configured to implement a multicast service according to the first information code stream received by the receiving unit, and an optimization unit, configured to optimize the multicast service according to the second information code stream received by the receiving unit. According to the technical solution provided by the embodiment of the present invention, the to-be-transmitted service information is encoded to obtain a first information code stream and a second information code stream; the base station sends the first information code stream, and the relay station receives the first information sent by the base station. The information code stream; the base station sends the second information code stream, the relay station simultaneously sends the received first information code stream, and the terminal respectively receives the first information code stream and the second information code stream to implement the multicast service And optimize. Transmitting the data sent by the base station twice to broadcast the first information code stream and the second information code stream, and after receiving the first information code stream, the relay station broadcasts the first information code stream while the base station broadcasts the second information code stream. Therefore, the base station is prevented from repeatedly transmitting the same content twice, which causes waste of radio resources, so that the relay system and the MBMS service are better combined. DRAWINGS

1 is a schematic diagram of a principle for delivering a multicast service in the prior art;

2 is a schematic flowchart of a method for implementing a multicast service according to a first embodiment of the present invention; FIG. 3 is a schematic structural diagram of a frame according to an embodiment of the present invention;

4 is a schematic structural diagram of a base station according to a third embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a relay station according to a fourth embodiment of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a terminal according to a fifth embodiment of the present invention.

detailed description

In order to make the specific technical solutions and the objects of the present invention more clear, the following description will be further described in conjunction with the specific embodiments and drawings.

Referring to FIG. 2, a first embodiment of the present invention is introduced, and a method for implementing a multicast service is described. In this embodiment, the method includes:

Step 201: Encode the to-be-transmitted multicast service information into a basic information code stream and an enhanced information code stream.

The multicast service information to be transmitted is incrementally multi-rate encoded at the application layer, and is encoded by a basic information code stream and one to multiple enhanced information code streams. The basic information code stream is used to implement multicast services, and the information stream is enhanced. To optimize the multicast service, and to implement the multicast service separately. For example, the multicast service information to be sent is a video signal, and when incremental multi-rate coding is performed, the gray information of the video signal can be encoded to obtain a basic information code stream capable of realizing a black and white image; An enhanced information code stream of the color image is further implemented; and the enhanced information code stream can also be hierarchically included with different enhanced information code streams for increasing the gray level or increasing the image resolution.

Step 202: The base station sends a basic information code stream, and the relay station receives the basic information code stream.

First, in the first phase, the base station transmits a basic information code stream. At this time, all terminal users and relay stations within the coverage of the base station receive the basic information code stream sent by the base station together. The end user stores the data in its own data area, and the relay station stores the received basic information code stream in its forwarding data area.

Step 203: The base station sends an enhanced information code stream, and the relay station sends the basic information code stream.

After the base station sends the basic information code stream, it is separated by a period of time. In the second stage, the base station retransmits the enhanced information code stream. The interval time cannot be shorter than the transmission and reception conversion time of the relay station. Otherwise, the transmission and reception conversion of the relay station cannot be satisfied. The interval time cannot be longer than the MBMS service processing time and the integration time of the basic information code stream and the enhanced information code stream by the terminal user. Otherwise, the MBMS service is It will be affected, and the end user will not be able to combine the received basic information stream and the enhanced information stream.

While the base station transmits the enhanced information code stream, the relay station transmits the basic information code stream previously received and stored in the forwarded data area.

Step 204: The terminal receives the basic information code stream and the enhanced information code stream.

In the coverage of the base station, the terminal user receiving the basic information code stream in the first stage receives the enhanced information code stream sent by the base station, and optimizes the already implemented multicast service; fails to receive the basic in the first stage. If the user of the information stream information can receive the basic information code stream sent by the relay station at this time, the basic information code stream and the enhanced information code stream can be received at the same time, and the basic multicast service can be realized and optimized.

Outside the range covered by the base station, the terminal user does not receive the basic information code stream and the enhanced information code stream sent by the base station, but if the terminal user is within the coverage of the relay station, the terminal can receive the relay. The basic information code stream sent in the second stage is implemented to implement basic multicast services.

In an embodiment of the present invention, in the second phase, the base station sends the enhanced information code stream, and the relay station sends the basic information code stream by using frequency division, time division, code division, and space division, regardless of which type is used. The mode is transmitted as long as the user terminal can receive and distinguish the basic information stream and the enhanced information stream.

The method for transmitting the multicast service information according to the embodiment of the present invention is implemented by the foregoing steps 201, 202, and 203, and details are not described herein again.

One of ordinary skill in the art will appreciate that all or part of the steps in implementing the above-described embodiments can be accomplished by program-related hardware. The software corresponding to the embodiment can be stored in a computer readable storage medium such as ROM/RAM, disk, optical disk, and the like.

For example, referring to FIG. 3, FIG. 3 is a schematic diagram of a frame structure in an embodiment of the present invention. In this embodiment, a base station and a relay station transmit resources in a frequency division manner. In Fig. 3, the horizontal axis direction is the time domain, in units of frames; the vertical axis direction is the frequency domain, which has a total bandwidth of 5M, and the time-frequency resources can be simultaneously used by the base station and the relay station. Each frame is divided into two phases, and there is a certain time interval between the first phase and the second phase. In the first stage, the base station sends a basic information code stream PP (Packe t Pr imary ), the relay station receives the basic information code stream sent by the base station; in the second stage, the base station transmits the enhanced information code stream PE (Packe t Enhanced ), and the relay station transmits the basic In the embodiment, the PP and PE data volume ratio may be 1··1, and the relay station receives the basic information code stream sent by the base station in the first phase of each frame, and uses the second phase of each frame. Half of the bandwidth broadcasts the basic information stream received. At this point, the relay station needs to use twice as much coding or modulation as the base station. For example, in the coding mode, the base station uses the l / 3 Turbo code, and the relay station needs to use the 2/3 Turbo code; or in the modulation mode, the base station uses the 4QAM modulation mode, and the relay station needs to use the 64QAM modulation mode. According to the actual application of the network and the user's degree of expectation for the quality of the multimedia broadcast multicast service, the proportion of the data volume of the basic information stream and the enhanced information stream can be changed, and the adjustment and coding methods can be used to achieve the most application of the multicast service. Good effect.

Through the specific implementation manner of the present invention, the multicast service information is decomposed into different code streams, according to the final The different channel conditions of the end users provide multi-quality multicast services, providing basic services for end users with poor channel conditions and higher quality services for end users with good channel conditions. At the same time, the multicast service is combined with the application of the relay system, and the base station in the relay system transmits the data twice to send the basic information code stream and the enhanced information code stream at one time, and the relay station receives the basic information code stream after receiving the basic information code stream. The base station sends the basic information code stream while transmitting the enhanced information code stream, thereby preventing the base station from repeatedly transmitting the same content twice, thereby causing waste of the wireless resources. In addition, in the relay system, the coverage of the multicast service is expanded by utilizing the performance of the relay station. Moreover, according to the method provided by the specific embodiment of the present invention, the modification of the existing multicast service is small, and the application of the MBMS in the relay system can be further facilitated.

The second embodiment of the present invention will be described below with respect to a method for implementing a multicast service. The steps in the method are basically the same as the steps in the first embodiment of the present invention. The difference is that in the first stage, the base station first transmits the enhanced information code stream, and the relay station receives the enhanced information code stream sent by the base station; in the second stage, the base station sends The basic information stream, the relay station transmits an enhanced information stream.

The end user receives the basic information stream and the enhanced information stream. The terminal user that only receives the enhanced information code stream cannot implement the multicast service. Therefore, in the method provided by the specific implementation manner, the terminal user that can only receive the signal sent by the relay station cannot implement the multicast service, but only the terminal user Multicast services can be implemented by being able to receive basic information streams sent by other base stations. Therefore, the scope of protection required by this.

Referring to Figure 4, a third embodiment of the present invention will be described with respect to a base station. The base station includes an encoding unit 401 and a transmitting unit 402.

The coding unit 401 is configured to encode the multicast service information to be sent, to obtain the first information code stream and the second information code stream.

The manner of encoding can be changed according to the degree to which the end user expects the quality of the multicast service. The first information code stream and the second information code stream obtained by the coding may be a basic information code stream or an enhanced information code stream, and the basic information code stream is used to implement a basic multicast service, and the enhanced information code stream is used for optimizing the actual information stream. The current basic multicast service cannot implement the multicast service separately. After the multicast service information to be transmitted is encoded, one basic information code stream and at least one enhanced information code stream may be formed.

The sending unit 402 is configured to separately send the first information code stream and the second information code stream that are encoded by the coding unit 401. Transmitting the first information code stream to the relay station and/or the terminal, after receiving the first information code stream, the terminal stores the first information code stream in the data area; after receiving the first information code stream, the relay station stores the first information code stream to be forwarded In the data area, sending the second information code stream, sending the second information code stream after the first information code stream is sent for a period of time, the interval time is not shorter than the transmission and reception conversion time of the relay station, otherwise the transmission and reception conversion of the relay station cannot be satisfied; The interval time cannot be longer than the MBMS service processing time and the combining time of the end user to the basic information stream and the enhanced information stream. Otherwise, the MBMS service will be affected, and the terminal user cannot receive the basic information stream and the enhanced information. The code streams are merged.

The base station provided in this embodiment is configured to divide the to-be-transmitted multicast service information into two types of information code streams and sequentially transmit them separately, thereby avoiding the waste of the same content by transmitting the same content twice in the relay system. The relay system and the MBMS service are better combined and applied.

Next, a fourth embodiment of the present invention will be described. With respect to a relay station 500, referring to FIG. 5, the relay station 500 includes a receiving unit 501 and a transmitting unit 502.

The receiving unit 501 is configured to receive a first information code stream sent by the base station;

The sending unit 502 is configured to send, by the base station, the first information code stream received by the receiving unit 501.

In the relay station of this embodiment, the first information code stream sent by the base station is first received, and then the received first information code stream is sent while the base station sends the second information code stream, which is guaranteed to be within the coverage of the base station. However, the terminal user who has not received the first information stream can still have the opportunity to receive the first information stream, and can enable the terminal user outside the coverage of the base station to receive the first information stream, thereby achieving multiple Broadcasting services, therefore, the use of the relay station can expand the coverage of the multicast service, enabling the multicast service to be used in a wider range of applications.

The following describes a fifth embodiment of the present invention. With respect to a terminal, referring to FIG. 6, the terminal package A receiving unit 601, a processing unit 602, and an optimization unit 603 are included.

The receiving unit 601 is configured to receive the first information code stream and the second information code stream;

When the terminal 600 is within the coverage of the base station, the receiving unit 601 first receives the first information code stream sent by the base station, stores it in the data area, and then receives the second information code stream sent by the base station; Within the coverage of the base station, when the base station sends the first information code stream, the receiving unit 601 does not receive the first information code stream, and may receive the first information sent by the relay station while the receiving base station sends the second information code stream. The information code stream; when the terminal 600 is outside the coverage range of the base station, if it is within the coverage of the relay station, the receiving unit 601 may receive the first information code stream when the relay station transmits the first information code stream.

The processing unit 602 is configured to implement basic multicast services according to the first information code stream received by the receiving unit 601.

The optimizing unit 603 is configured to optimize the basic multicast service according to the second information code stream received by the receiving unit 601.

Through the foregoing specific embodiments of the present invention, the multicast service information is decomposed into different code streams, and the multi-quality service is provided according to different channel conditions of the terminal user, and the basic service is provided to the terminal user with poor channel conditions, and is the channel. End users with good conditions provide higher quality services. At the same time, the multicast service is combined with the application of the relay system, and the base station in the relay system transmits the data twice to send the basic information code stream and the enhanced information code stream at one time, and the relay station receives the basic information code stream after receiving the basic information code stream. The base station sends the basic information code stream while transmitting the enhanced information code stream, thereby preventing the base station from repeatedly transmitting the same content twice and wasting the wireless resources. In addition, in the relay system, the coverage of the multicast service is expanded by utilizing the performance of the relay station. Moreover, according to the method provided by the specific embodiment of the present invention, the modification of the existing multicast service is small, and the application of the MBMS in the relay system can be further facilitated.

While the invention has been illustrated and described with reference to the preferred embodiments embodiments The spirit and scope of the invention.

Claims

Claim

A method for transmitting multicast service information, comprising:

Encoding the to-be-transmitted service information to obtain a first information code stream and a second information code stream;

The base station transmits the first information code stream, the relay station receives the first information code stream sent by the base station, the base station sends the second information code stream, and the relay station simultaneously transmits the received first information code stream.

The method for transmitting multicast service information according to claim 1, wherein a time interval exists between the base station transmitting the first information code stream and transmitting the second information code stream.

The method for transmitting multicast service information according to claim 2, wherein the time length of the time interval is not less than the transceiving conversion time of the relay station.

The method for transmitting multicast service information according to claim 1, wherein the first information code stream and the second information code stream are a basic information code stream or an enhanced information code stream.

The method for transmitting multicast service information according to claim 1, wherein the base station and the relay station use time division or when transmitting the first information code stream and/or the second information code stream. One or more of frequency division or code division or space division diversity transmission.

A base station, comprising: a coding unit and a transmission unit;

The coding unit is configured to encode service information to be sent, to obtain a first information code stream and a second information code stream;

7. A relay station, comprising:

a receiving unit, configured to receive a first information code stream sent by the base station;

8. A method for implementing a multicast service, characterized in that:

Encoding the service information to be obtained, and obtaining the first information code stream and the second information code stream; The base station sends the first information code stream, the relay station receives the first information code stream sent by the base station; the base station sends the second information code stream, and the relay station simultaneously sends the received first information code stream;

The method for implementing the multicast service according to claim 8, wherein the acquiring, by the terminal, the first information code stream to implement the multicast service comprises:

When the terminal receives the first information code stream sent by the base station, implementing multicast service; when the terminal does not receive the first information code stream sent by the base station, receiving the first message sent by the relay station Information stream, to achieve multicast services.

The method for implementing the multicast service according to claim 9, wherein the method further comprises: receiving, after the terminal receives the first information code stream sent by the base station, implementing the multicast service, The second information code stream sent by the base station optimizes the multicast service.

The multicast service implementation method according to claim 8, wherein a time interval exists between the base station transmitting the first information code stream and transmitting the second information code stream.

The multicast service implementation method according to claim 8, wherein the base station and the relay station use time division or frequency when transmitting the first information code stream and/or the second information code stream. One or more of the division or code division or space division diversity transmission.

1 3, a terminal, comprising:

a processing unit, configured to implement a multicast service according to the first information code stream received by the receiving unit, and an optimization unit, configured to optimize the multicast service according to the second information code stream received by the receiving unit.