WO2011097754A1

WO2011097754A1 - Transmission method and device for scalable coding stream in relay network

Info

Publication number: WO2011097754A1
Application number: PCT/CN2010/000191
Authority: WO
Inventors: 杜鸿飞
Original assignee: 上海贝尔股份有限公司; 阿尔卡特朗讯
Priority date: 2010-02-11
Filing date: 2010-02-11
Publication date: 2011-08-18
Also published as: CN102763450B; CN102763450A

Abstract

A transmission method for scalable coding stream in a relay network is disclosed. The method includes that the base station responds to the feedback from the user equipment, periodically adjusts the rate of the base layer and the enhancement layer transmitted directly by the base station and the rate of the base layer and the enhancement layer transmitted by the relay station. According to the present invention, useless transmission for the base layer and the enhancement layer of the base station can be avoided considerably; error correction retransmission of the base layer is performed by using the relay; the user equipment can obtain the maximum video effect in the allowable capability range; the bandwidth and the power consumption are saved, and the transmission efficiency and the receiving service quality of the user equipment are enhanced.

Description

Method and device for transmitting scalable coded stream in relay network

Technical field

The present invention relates to wireless communication technologies, and in particular, to an SVC-based E-MBMS streaming method and apparatus for use in an evolved multimedia broadcast multicast service E-MBMS relay network. Background technique

In an actual E-MBMS system, even if a user has the ability to receive a complete quality of service content, the user may only want to receive a low quality service content that meets the customer's needs due to various factors (eg, price). Similarly, if the user does not have the ability to receive full quality service content, it is more necessary to provide a low quality service content that meets the customer's needs.

Currently, there are a number of methods for determining the transmission rate of an E-MBMS multicast (MC) group. Generally, the transmission rate of the E-MBMS multicast stream can be determined based on the capacity of the radio fading channel experienced by all group members.

Scalable Video Coding (SVC) technology such as H.264 MEPG Advanced Video Coding AVC (Advance Video Coding) can transmit video/audio data while adapting to a wide range of underlying network/link changes and receiver diversity. In SVC-encoded streams, video streams are divided into base layer (BL) and multiple enhancement layer (EL) streams with respect to time (frame rate), space (resolution), and quality (SNR). The reception of the base layer guarantees the lowest reception limit of the user. On this basis, the quality of the reconstructed video can be gradually and gradually improved every time some enhancement layer information is received.

With SVC technology, the content of the E-MBMS stream can be encoded into multiple streams, where one stream is the underlying stream that includes the underlying content of the E-MBMS, while the other streams are enhanced streams of enhancement to the underlying content. The underlying stream provides the smallest codeable content that must be successfully received to produce the lowest quality of the original stream. The enhanced stream further provides enhanced content.

Currently, there are a number of ways to set the rate of the base layer and the enhancement layer. The general rule is that the total rate should be sufficient for all users. One of the simplest settings is Set the base rate to the rate at which the worst user can successfully decode. Another alternative is to set the base rate to the average expected rate for all users. However, these settings can lead to serious inefficiencies and low utilization issues, which are particularly acute in multicast networks where the instantaneous performance distribution changes rapidly.

On the other hand, multi-hop wireless access networks with relays can greatly expand the network coverage and capacity compared to single-hop networks, and are therefore considered to be an attractive solution for video multicast transmission. However, introducing trunking between users and base stations is bound to present challenges in modeling and optimization. This is especially true in video transmission scenarios where progressive scalable video coding is used in E-MBMS networks.

Therefore, there is a need for an improved scalable video coding method for an E-MBMS relay network. Summary of the invention

To this end, an SVC-based dynamic rate adjustment scheme is proposed in the E-MBMS relay network, which is used to adjust the scalable video source stream between the base station and the relay station according to the instantaneous channel change of the user equipment. In this scheme, when the user equipment cannot successfully receive the enhancement layer code stream transmitted from the base station, the base station should interrupt the enhancement layer code stream transmission, and the base station compensates.

According to an aspect of the present invention, a method for transmitting a scalable encoded stream in a relay network is provided. The method includes the following steps: the base station receives a receiving capability change indication of the user equipment; and the base station changes according to the receiving capability of the user equipment. Determining a rate of a base layer and a rate of an enhancement layer in the scalable coded stream transmitted by the base station, and a rate of the base layer and a rate of the enhancement layer in the scalable coded stream transmitted by the relay station; the base station is scalable according to the determined base station transmission The rate of the base layer in the coded stream and the rate of the enhancement layer respectively encode the base layer and the enhancement layer of the scalable coded stream transmitted by the base station, and transmit the coded scalable coded stream to the user equipment; the base station notifies the relay station of the determined The rate of the base layer and the rate of the enhancement layer in the scalable coded stream transmitted by the relay station; the rate of the base layer and the rate of the enhancement layer in the scalable coded stream transmitted by the relay station according to the base station determined by the base station are respectively through the relay station Coding of the base layer and enhancement layer of the transportable scalable coded stream Hierarchical encoding to the user device may transmit the encoding stream. Preferably, the relay network is an MBMS relay network, and the scalable encoded stream is an MBMS stream.

According to another aspect of the present invention, a base station is provided, including: a base station side receiving unit, configured to receive a receiving capability change indication of a user equipment from a user equipment; and a rate determining unit, configured to: according to the receiving capability change indication of the user equipment Determining a rate of a base layer and an enhancement layer of the scalable coded stream transmitted by the base station and a rate of a base layer and an enhancement layer of the scalable coded stream transmitted by the relay station; and a notifying unit, configured to notify the relay station of the pass through the relay station determined by the rate determining unit Transmitting a rate of the base layer and the enhancement layer of the scalable coded stream, so that the relay station respectively encodes the base layer and the enhancement layer of the scalable coded stream based on the determined rate; and the base station side coding unit is configured to transmit at the determined base station The base layer and the enhancement layer of the scalable coded stream respectively encode the base layer and the enhancement layer of the scalable coded stream; and the base station side stream transmission unit is configured to transmit the coded scalable coded stream to the user equipment.

By using the invention, the useless transmission of the base layer and the enhancement layer of the base station can be avoided to the greatest extent; the error correction retransmission of the base layer is performed by using the relay; the highest video effect in the range allowed by the user equipment is obtained; and the bandwidth and power consumption are saved. Improve transmission efficiency and quality of service received by user equipment. DRAWINGS

The above objects, advantages and features of the present invention will become apparent from

1 is a schematic diagram showing a network topology of an evolved E-MBMS to which the present invention is applied;

2 shows a signaling flow diagram of a method of transmitting a scalable encoded stream in accordance with an embodiment of the present invention;

FIG. 3 illustrates an example scenario of E-MBMS streaming in accordance with an embodiment of the present invention;

4 illustrates a partitioning of a scalable encoded stream transfer area in accordance with an embodiment of the present invention;

Figure 5 shows a system for implementing a transmission method of a scalable encoded stream according to the present invention. System block diagram specific implementation

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, some specific embodiments are for illustrative purposes only and are not to be construed as limiting the invention. It is to be noted that the schematic diagrams only show the differences from the prior systems, and the conventional structures or configurations are omitted so as not to obscure the understanding of the present invention.

The invention is based on the fact that both the base station and the relay station are capable of receiving a complete and accurate channel quality, and the channel capacity between the base station and the relay station will be independent of the channel capacity between the relay station and the user equipment. The video content is first encoded at the base station into a scalable video stream, which is then transmitted to the relay station or sent to the user equipment.

Fig. 1 is a diagram showing the network topology of an E-MBMS relay network to which the present invention is applied. As shown in Figure 1, the content provider provides various service content to the user equipment via the base station. The base station can directly access the user equipment or indirectly access the user equipment via the relay station. Here, the BM-SC is a broadcast multicast service center, and the data provided by the content provider is converted into a broadcast multicast form and sent to the MBMS network.

In the present invention, it is considered that each user equipment can establish a unicast connection with a base station and a relay station, and the relay station can not only successfully receive the base layer and the enhanced layer stream of the scalable video encoded stream, but also has a complete scalable video decoding and coding function. . Therefore, the relay station can adjust the rate of each SVC encoded stream layer as needed and selectively transmit it to the user equipment as needed.

Fig. 2 is a flow chart showing the signaling of a method of transmitting a scalable encoded stream in accordance with a first embodiment of the present invention. Here only the relay station is always able to receive the complete base layer and enhancement layer, so the following will not consider the flow between the base station and the relay station, but only between the base station-user equipment and the relay station-user equipment link. The streaming is described.

As shown in Figure 2, at the beginning of the MBMS session, the base station transmits a session start message to the user equipment through the transmit antenna.

The user equipment receiving the session start message feeds back the initial user equipment reception capability to the base station. The user equipment reception capability here indicates the comprehensive capability of the user equipment to receive the service flow directly from the base station and receive the service flow through the relay station. The base station determines the rate of the base layer and the enhancement layer according to the receiving capability of the user equipment, and encodes the MBMS stream according to the selected rate to generate a base layer and an enhancement layer having the determined rate. The encoded MBMS stream is then sent to the user equipment.

The user equipment feeds back the updated user equipment reception capability to the base station during the MBMS session. Here, the updated user equipment reception capability may be fed back to the base station periodically, or may be fed back when the user equipment reception capability changes greatly (e.g., greater than a predetermined threshold).

Upon receiving the updated user equipment reception capability from the user equipment, the base station determines the rate of the base layer and the enhancement layer directly transmitted by itself and the rate of the base layer and the enhancement layer transmitted through the relay station, and notifies the relay station of the determined through relay station The rate of the base layer and enhancement layer of the transmission. Then, the base station encodes the MBMS stream according to the determined rate of the base layer and the enhancement layer of its own direct transmission, generates a base layer and an enhancement layer with a re-determined rate, and transmits it to the user equipment.

The relay station determines the rate of the base layer and the enhancement layer when receiving the updated user equipment reception capability from the user equipment, and encodes the MBMS stream according to the selected rate, generates a base layer and an enhancement layer with a re-determined rate, and Sent to the user device.

At the end of the MBMS session, the user equipment sends an MBMS session end effect to the base station to inform the base station that the MBMS session is over. Of course, the end of the MBMS session can also be initiated by the base station.

In the scalable video coding method according to the first embodiment of the present invention, the base station will dynamically encode the MBMS stream according to the reception capability of the user equipment.

It should be noted that although a user equipment is taken as an example here, the above method is also applicable to a user equipment multicast group having multiple user equipments.

Referring to FIG. 3, a typical relay transmission scenario is taken as an example to describe the foregoing method, that is, a scenario of a base station (S)-relay station (R)-user equipment (D). As shown in FIG. 3, if the user equipment can only receive the base layer code stream (BL) from the base station, the relay station performs compensation for the enhanced layer code stream (EL) on the user equipment. Of course, if the user equipment cannot receive any code stream from the base station, the user equipment can request the relay station to retransmit the base layer code stream by HARQ with the relay station, and compensate the enhancement layer code stream. That is to say, the relay station can perform two tasks: 1) retransmission of the base layer; 2) enhancement layer make up.

Specifically, the base station and the relay station can cooperate with each other to complete intelligent complementary transmission: If the user equipment loses part of the base layer information in the base station transmission, the user equipment will first notify the nearest relay station to retransmit without requesting the base station to retransmit. Thus, the signaling and data for retransmission between the user equipment and the base station will be greatly reduced, and the retransmission load is effectively transferred to each relay station. In addition, communication with the relay station reduces the power consumption of the user equipment;

If the user equipment loses the enhancement layer information, it will notify the relay station to compensate. By utilizing the user equipment-inter-relay channel, the actual reception capability of the user equipment is enhanced.

In order to better illustrate the actual receiving capability of the user equipment, FIG. 4 defines the division of the scalable coding stream transmission area, and specifically divides the area around the base station and the relay station according to the receiving capability of the user equipment. As shown in FIG. 4, the area around the base station is divided into an e-EL area (the area inside the circle as shown by the thin solid line in FIG. 4) and an e-BL area (in the circle shown by the thick solid line in FIG. 4). The area around the relay station is divided into an r-EL area (the area inside the circle as shown by the two-dot chain line in Fig. 4) and an r-BL area (in the circle shown by the alternate long and short dash line in Fig. 4). Area). The e-EL area indicates that the user equipment can receive the base layer and the enhancement layer simultaneously through the base station, the e-BL area indicates that the user equipment can only receive the base layer through the base station, and the r-EL area indicates that the user equipment can receive the base through the relay station at the same time. The layer and enhancement layer, as well as the r-BL area, indicate that the user equipment can only receive the base layer through the relay station.

It should be noted that this transmission area is not divided according to the distance from the base station like a normal cell, but represents a virtual area in which the reception capabilities of all user equipments are within a limited range.

In the present invention, the following principles are considered: If the base station can simultaneously receive the enhancement layer code stream and the base layer code stream from the base station and the relay station, the base station is preferentially selected for transmission.

As shown in FIG. 4, the user equipment 1 is located in the e-EL area, has better channel state conditions, and can receive the complete base layer code stream and the enhancement layer code stream simultaneously from the base station. The user equipment 2 is located in the intersection area of the e-BL area and the r-EL area and does not intersect the e-EL, and cannot receive the enhancement layer code stream from the base station, but can receive the complete base layer code stream from the base station. At the same time, the enhancement layer code stream can also be received from the relay station. User equipment 3 digits In the area of the e-BL area that does not intersect the r-EL and the area that does not intersect the e-BL area in the r-BL area, the enhancement layer code stream cannot be received from the base station and the relay station, but can be received from the base station. The base layer code stream. The user equipment 4 is located in an area of the r-EL area that does not intersect the e-BL area, and cannot receive the base layer and the enhancement layer code stream from the base station, but can receive the enhancement layer and the base layer code stream from the relay station. The user equipment 5 is located in an area of the r-BL area that does not cross the e-EL area and the e-BL area, cannot receive the base layer and the enhancement layer code stream from the base station, and cannot receive the enhancement layer code stream from the relay station, but A complete base layer code stream can be received from the relay station. The user equipment 6 is located outside the e-EL area, the e-BL area, the r-EL area, and the r-BL area, and cannot receive the base layer and the enhancement layer code stream from the base station and the relay station, that is, the user equipment 6 cannot receive the MBMS stream. .

In order to ensure the best reception quality, the base layer code stream should be transmitted as much as possible based on the receiving capability of the user equipment. Whether a fixed-rate video is transmitted with the full base layer or with the base layer plus the enhancement layer depends on the final video quality that the SVC encoder can provide.

Definitions (0 and the base layer and enhancement layer rate for the base station transmission at a specific time t. The base layer and enhancement layer rates transmitted by the relay station are ) and /? (t). The maximum rate/receive represents the rate of traffic flow specified by the content provider, and the minimum rate is expressed as the minimum rate required for the scalable video encoded stream to be decoded by the lowest quality.

In each time slot t, the receiving capability of the user equipment is Z (0. For dynamic rate adjustment, the following user equipment reception capability parameters are defined according to the user equipment area division in Figure 4:

- indicates the receiving capability required to receive both the base layer and the enhancement layer code stream from the base station;

- indicating the receiving capability required to receive the base layer code stream from the base station;

- ^^ indicates the ability to receive the base layer and enhancement layer streams simultaneously from the nearest relay;

- Indicates the receiving capability required to receive the base layer code stream from the nearest relay station.

Thus, for the user equipment 1, t) _≥ L _e - _{EL 0} for the user equipment 2,

^L e-BL < L{t) < L _e _ _EL & If ) > L _r _ _EL . For user equipment 3, ≤ (0<^- a&W< -. For user equipment 4, LH L & L^ Ln For user equipment 5, (0 <& ≤ (0 < - _£ . For user equipment 6, (0<4- &0)<, _-β "

In the E-MBMS relay network, each user equipment can establish a connection with the base station through multicast or unicast. The dynamic rate setting in EMBMS streaming according to a specific embodiment of the present invention will be described below with respect to unicast and multicast, respectively, in conjunction with FIG. 4:

First example: Dynamic rate setting in unicast case

When the base station and the relay station receive parameters from one of the user equipments 1-6, the system will perform dynamic rate adjustment based on the different reception capabilities of the user equipments 1-6, where R represents the non-superimposed instantaneous transmission rate of the base station or relay station:

User equipment 1: The channel condition of the user equipment is good, and the complete base layer code stream and the enhancement layer code stream can be simultaneously received from the base station, that is, {^^) ≥ ^ }. In this case, the relay station will terminate the base layer and enhancement layer compensation transmission, but still initiate packet loss retransmission. At this time, the base station

The rate settings at nMIN n L * r MAX nMIN and at the relay station are: ^R e ^ = ^R , ^R e ^ = ^R ~ ^R , do, do.

User equipment 2: The user equipment cannot receive the enhancement layer code stream from the base station, but can receive the complete base layer code stream from the base station, ie {

}. In this case, the relay station will be used to compensate for enhancement layer code stream transmission while the base station will terminate the enhancement layer code stream transmission. At this time, the rate settings at the base station and the relay station are respectively: ^R e ^ = ^R , User equipment 3: The user equipment cannot receive the enhancement layer code stream from the base station and the relay station, but can receive the complete base layer code stream from the base station. , ie { _≤ (0<4^&(0<4- _a }. In this case, the relay station will not be used to compensate the enhancement layer code stream transmission, and the base station will terminate the enhancement layer code stream transmission. At this time, the base station is The rate settings at the relay station are: d ^R Delete, ^RL )=o, ^( =0, C o User Equipment 4: The user equipment cannot receive the base layer and enhancement layer code streams from the base station, but can receive the basis from the relay station. Layer and enhancement layer code stream, ie {W)<^- _Si &W _≥ - _£ }. In this case, the relay station will be used to compensate the base layer and enhancement layer code stream transmission, while the base station will terminate the base layer and enhancement layer code. Streaming. At this point, the rate settings at the base station and the relay station are: O)=o, O)=o, d ^R draw, User equipment 5: The user equipment cannot receive the base layer and the enhancement layer code stream from the base station, but can receive the base layer {^)<^-^&≤^)<^^} from the relay station. In this case, the relay station will be used to compensate for the base layer code stream transmission, while the base station will terminate the base layer and enhancement layer code stream transmission. At this time, the rate settings at the base station and the relay station are: ^L (o = ₀ d ^R (o=o.

User equipment 6: The user equipment cannot receive the base layer and enhancement layer code streams from the base station and the relay station, ie { W<^ &W< - _fl }. In this case, the transmission will be terminated. Rate setting: R ₎₌₀

(0 ₌₀ .

Second example: Dynamic rate setting in multicast case

The difference between the multicast situation and the unicast situation is as follows: Each user equipment in the user equipment multicast group will feed back the indication of the change of the receiving capability of the user equipment. Therefore, the base station and the relay station need to feed back multiple feedbacks of the user equipment multicast group. The receiving capability change indication of the user equipment is processed. However, this is not within the scope of the present invention and thus will not be described. Here, the dynamic rate adjustment performed by the base station and the relay station when receiving the reception capability indication of the user equipment from the user equipment multicast group is exemplified only according to the following scenario:

Scenario 1: All user equipments in the user equipment multicast group can receive the base layer and enhancement layer code streams from the base station simultaneously. In this case, the relay station will terminate the base layer and enhancement layer compensation transmission but still turn on packet loss retransmission. Rate setting: = ^RM,N ,

R ^L (o=R ^MAX -R ^M ' ^N do,

Scenario 2: One or more user equipments in the user equipment multicast group cannot receive the enhancement layer code stream from the base station, but all user equipments in the user equipment multicast group can receive the complete base layer code stream from the base station. In this case, the relay station will be used to compensate the enhancement layer code stream transmission of one or more user equipments in the user equipment multicast group, and the base station will continue to enhance the layer code stream transmission. Rate setting: d ^R R! ^L ( =R ^MAX -R ^MIN , ^( =0, (OH (the relay station where the user equipment is located),

-R ^M,N (the relay station where other user equipments are located).

Scenario 2': All user equipments in the user equipment multicast group cannot receive the increase from the base station. Strong layer code stream, but all user equipments in the user equipment multicast group can receive the complete base layer code stream from the base station. In this case, the relay station will be used to compensate for the enhancement layer code stream transmission of all user equipments in the user equipment multicast group, and the base station will terminate the enhancement layer code stream transmission. Rate setting: d ^R , ^( =o, (o=o, (o=f ^A — ^w (the relay station where all user equipments are located).

Scenario 3: One or more user equipments in the user equipment multicast group cannot receive the enhancement layer code stream from the base station and the relay station, but all user equipments in the user equipment multicast group can receive the base layer code stream from the base station. In this case, the relay station will be used to compensate for enhancement layer code stream transmissions of other user equipments in the user equipment multicast group, while the base station will continue to enhance layer code stream transmission. Rate setting: c ^M ' ^N , H ^X -R should; do, do

(The relay station where the user equipment is located), R _r ^E '{t)=R ^MAX -R ^M,N (the relay station where other user equipments are located).

Scenario 3': All user equipments in the user equipment multicast group cannot receive the enhancement layer code stream from the base station and the relay station, but all user equipments in the user equipment multicast group can receive the base layer code stream from the base station. In this case, the relay station will not be used to compensate the enhanced layer code stream transmission of the user equipment multicast group, and the base station will not continue to enhance the layer code stream transmission. Rate setting: „ , A ^£ W=o _; V(0=0, ^ ^£i ( =0 _o

Scenario 4: All user equipments in the user equipment multicast group cannot receive the base layer and enhancement layer code streams from the base station, but all user equipments in the user equipment multicast group can receive the base layer and enhancement layer code streams from the relay station. In this case, the relay station will be used to compensate the base layer and enhancement layer code stream transmission of all user equipments in the user equipment multicast group, and the base station will terminate the base layer and enhancement layer code stream transmission. Rate setting: d o, d o,

Scenario 5: All user equipments in the user equipment multicast group cannot receive the base layer and enhancement layer code streams from the base station, but all user equipments in the user equipment multicast group can receive the base layer from the relay station. In this case, the relay station will be used to compensate for the base layer code stream transmission. At the same time, the base station will terminate the base layer and enhancement layer code stream transmission. Rate setting: (0 =0, ^ ( =o, R ^L {t) = R ^MM _f R^ (t) = ₀ .

Scenario 6: All user equipments in the user equipment multicast group cannot receive the base layer and enhancement layer code streams from the base station and the relay station. In this case, the transfer will be terminated. Rate setting: ^ ( =o, ^ ( =o, ^( =o, (0=0.

Figure 5 is a block diagram showing the structure of a system for implementing a method of transmitting a scalable encoded stream in accordance with an embodiment of the present invention. The system includes a base station 10 and a relay station 30 and includes a user equipment 50.

As shown in FIG. 5, the base station 10 includes a base station side receiving unit 101, a rate determining unit 103, a base station side encoding unit 105, a base station side stream transmission unit 107, and a notifying unit 109.

The base station side receiving unit 101 receives the current receiving capability change indication of the user equipment from the user equipment 50.

The rate determining unit 103 determines the rate of the base layer and the enhancement layer transmitted by the base station and the rates of the base layer and the enhancement layer transmitted by the relay station according to the reception capability change indication of the user equipment, and notifies the relay station of the determined passage by the notification unit 109. The rate of the base layer and enhancement layer transmitted by the relay station.

Then, the base station side encoding unit 105 encodes the MBMS stream at the determined rate, generates a base layer and an enhancement layer having the determined rate, and transmits the encoded stream to the user equipment 50 via the base station side stream transmission unit 107.

The relay station 30 includes a relay station side receiving unit 301, a relay station side encoding unit 303, and a relay station side stream transmission unit 305.

The relay station side receiving unit 301 is configured to receive the rate of the base layer and the enhancement layer transmitted by the relay station determined by the base station of the notifying unit 109. The relay station side encoding unit 303 encodes the MBMS stream based on the determined rate to generate a base layer and an enhancement layer having the determined rate. Finally, the relay side stream transmission unit 305 transmits the encoded stream to the user equipment 50.

It should be noted that although a user equipment is taken as an example here, the present invention is also applicable to a user equipment multicast group having a plurality of user equipments.

A base station implementing a transmission method of a scalable encoded stream according to an embodiment of the present invention periodically adjusts a base layer of its own direct transmission and increases in response to feedback from a user equipment The rate of the strong layer and the rate of the base layer and the enhancement layer transmitted through the relay station have the following advantages: the useless transmission of the base layer and the enhancement layer of the base station can be avoided to the utmost; the error correction retransmission of the base layer is performed by using the relay; The device gets the highest video performance within the allowed range; and saves bandwidth and power consumption, improves transmission efficiency and user equipment reception service

It should be noted that the above embodiment uses video as an illustrative application for presentation. Of course, the invention is not limited to video, audio applications and other compatible applications are also suitable.

Although the above description relates to a plurality of units, the present invention can also be implemented by dividing one unit into a plurality of units or combining a plurality of units into one unit as long as it can still perform the corresponding functions.

Those skilled in the art will readily recognize that the different steps of the above methods can be implemented by a programmed computer. Herein, some embodiments also include a machine readable or computer readable program storage device (eg, a digital data storage medium) and encoding machine executable or computer executable program instructions, wherein the instructions perform some of the above methods or All steps. For example, the program storage device can be a digital memory, a magnetic storage medium (such as a magnetic disk and magnetic tape), hardware, or an optically readable digital data storage medium. Embodiments also include a programming computer that performs the steps of the above method.

The description and drawings merely illustrate the principles of the invention. It will be appreciated that those skilled in the art are able to devise various structures, and the various structures are not described or illustrated herein, but are intended to be within the spirit and scope of the invention. In addition, all the examples mentioned herein are expressly used primarily for teaching purposes only to assist the reader in understanding the principles of the present invention and the concepts promoted by the inventors, and should be construed as not being specifically mentioned. Limitations of examples and conditions. Moreover, all statements herein reciting the original U, aspects, and embodiments of the present invention, as well as the specific examples thereof, are included in their equivalents.

The above description is only used to implement the embodiments of the present invention, and those skilled in the art should understand that any modifications or partial substitutions without departing from the scope of the present invention should fall within the scope defined by the claims of the present invention. The scope of the invention should be determined by the scope of the claims.

Claims

Rights request

A method for transmitting a scalable encoded stream in a relay network, the method comprising the steps of:

Receiving, by the base station, a receiving capability change indication of the user equipment;

The base station determines, according to the receiving capability change indication of the user equipment, the rate of the base layer and the rate of the enhancement layer in the scalable coded stream transmitted by the base station, and the rate of the base layer and the rate of the enhancement layer in the scalable coded stream transmitted by the relay station;

The base station encodes the base layer and the enhancement layer of the scalable coded stream transmitted by the base station according to the determined rate of the base layer and the rate of the enhancement layer in the scalable coded stream transmitted by the base station, and transmits the coded scalable to the user equipment. Coded stream

The base station notifies the relay station of the determined rate of the base layer and the rate of the enhancement layer in the scalable coded stream transmitted by the relay station;

The relay station encodes the base layer and the enhancement layer in the scalable coded stream transmitted by the relay station according to the rate of the base layer and the rate of the enhancement layer in the scalable coded stream transmitted by the relay station determined by the base station, and transmits the base layer and the enhancement layer in the scalable coded stream transmitted by the relay station, respectively, and transmits to the user equipment Encoded scalable encoded stream.

2. The scalable coded stream transmission method according to claim 1, wherein when the receiving capability change indication of the user equipment indicates that the user equipment can receive the complete base layer code stream and the enhancement layer code stream from the base station, the base station The rate of the base layer in the scalable encoded stream transmitted by itself is set to a predetermined first rate, the rate of the enhancement layer is set to a predetermined second rate, and the remaining rates are set to zero.

3. The scalable coded stream transmission method according to claim 1, wherein when the user equipment's reception capability change indication indicates that the user equipment can only receive the complete base layer code stream from the base station, the base station transmits itself. The rate of the base layer in the scalable encoded stream is set to a predetermined first rate, and the rate of the enhancement layer in the scalable encoded stream transmitted through the relay station is set to a predetermined second rate, and the remaining rates are set to zero. ,

4. The scalable encoded stream transmission method according to claim 1, wherein when the receiving capability change indication of the user equipment indicates that the user equipment can only receive the complete base layer code stream from the base station, and cannot receive the enhanced from the relay station. When layering streams, the base station will itself The rate of the base layer in the transmitted scalable encoded stream is set to a predetermined first rate, and the remaining rates are set to zero.

The scalable coded stream transmission method according to claim 1, wherein when the receiving capability change indication of the user equipment indicates that the user equipment cannot receive the complete base layer code stream and the enhancement layer code stream from the base station, but can be from the relay station. Upon receiving the base layer code stream and the enhancement layer code stream, the base station sets the rate of the base layer in the scalable coded stream transmitted by the relay station to a predetermined first rate, and sets the rate of the enhancement layer in the scalable coded stream transmitted through the relay station. To schedule the second rate, and set the remaining rate to zero.

The scalable coded stream transmission method according to claim 1, wherein when the receiving capability change indication of the user equipment indicates that the user equipment cannot receive the complete base layer code stream and the enhancement layer code stream from the base station, but can be from the relay station. Upon receiving the base layer code stream, the base station sets the rate of the base layer in the scalable coded stream transmitted through the relay station to a predetermined first rate, and sets the remaining rate to zero.

The scalable coded stream transmission method according to any one of claims 1 to 6, wherein the predetermined first rate is that the scalable coded stream is capable of decoding the lowest rate at a lowest quality, and the predetermined second rate is scalable. The difference between the predetermined total rate of the encoded stream and the predetermined first rate.

8. The scalable coded stream transmission method according to claim 1, wherein the base station is terminated when the reception capability change indication of the user equipment indicates that the user equipment cannot receive the base layer code stream and the enhancement layer code stream from the base station and the relay station. transmission.

The scalable encoded stream transmission method according to any one of claims 1-8, wherein the relay network is an MBMS relay network, and the scalable encoded stream is an MBMS stream.

The scalable encoded stream transmission method according to any one of claims 1-8, wherein the scalable encoded stream is a scalable encoded stream based on scalable video coding.

11. A base station comprising:

a base station side receiving unit, configured to receive, by the user equipment, a user equipment receiving capability change indication;

a rate determining unit, configured to determine, according to the user equipment receiving capability change indication, a rate of a base layer and an enhancement layer of the scalable coded stream transmitted by the base station, and a rate of a base layer and an enhancement layer of the scalable coded stream transmitted by the relay station; a notification unit, configured to notify the relay station of a rate of a base layer and an enhancement layer of the scalable coded stream transmitted by the relay station determined by the rate determining unit, so that the relay station separately respectively performs a base layer and an enhancement layer of the scalable coded stream based on the determined rate Coding

a base station side coding unit, configured to separately encode a base layer and an enhancement layer of the scalable coded stream at the determined rate; and

The base station side stream transmission unit is configured to transmit the encoded scalable coded stream to the user equipment.

The base station according to claim 11, wherein the relay network is an MBMS relay network, and the scalable encoded stream is an MBMS stream.

The base station according to claim 11 or 12, wherein the scalable coded stream is a scalable coded stream based on scalable video coding.