CN101820327A - Relay transmission method, system and equipment combining multi-description characteristics of information source - Google Patents

Abstract

The invention discloses a relay transmission method, system and equipment combined with multiple description features of information sources. The method is applied to a network system including a base station, a plurality of relay stations, and a user terminal. The method includes: the relay station receiving all information sent by the base station through multiple description information source coding; the relay station according to the relay group to which the device belongs and all the information, obtain the description stream corresponding to the relay group to which the device belongs and perform modulation and coding; the relay station sends the modulated and coded description stream to the user terminal until the description stream reaches the user terminal . By using the present invention, the transmission rate of the multimedia information and the robustness of the system can be effectively improved by using the relay transmission mode combined with the multi-description feature of the information source.

Description

A relay transmission method, system and device combining multiple description features of information sources

technical field

The present invention relates to the technical field of communication, in particular to a relay transmission method, system and equipment combined with multiple description features of information sources.

Background technique

In the current research on video coding, there are two different source coding ideas: multi-resolution-based hierarchical coding SC (Scalable Coding) and multi-description-based coding MDC (Multiple Description Coding).

Based on multi-resolution hierarchical coding, the video is divided into a base layer and an enhancement layer through orthogonal transformations such as wavelet transform and DCT (Discrete Cosine Transform, discrete cosine) transform: the base layer contains low-frequency information, and the enhancement layer contains high-frequency information. The information priority of the basic layer is high, and a reliable transmission link is required; the information priority of the enhancement layer is low, and the requirement for link reliability is low. Depending on the channel quality of the terminal, if the channel performance is too poor, part of the information of the enhancement layer can be discarded. This type of encoding is suitable for use in networks where there are multiple paths with unequal error protection.

Source coding based on multiple descriptions is to divide the original image or video into several equivalent parts, each part is called a description, and each description has a strong correlation. Each description is transmitted to the receiving end through different network paths. As long as the receiving end receives one of the descriptions, it can reconstruct a certain quality of image or video information. The more descriptions received, the better the quality of the reconstructed image or video will be. Compared with hierarchical coding with unbalanced error protection, it is especially suitable for transmission networks without paths with unequal error protection capabilities. The schematic diagram of the multi-description codec model is shown in Figure 1. The same image is decomposed into multiple descriptions, and each description is encoded independently and transmitted to the decoder through different channels. The decoder can decode any number of description streams.

In the prior art, the schematic diagram of the cellular relay network is shown in Figure 2. By integrating the "multi-hop" technology into the existing cellular network (also known as the traditional cellular network), the communication distance between communication nodes is shortened, and the communication distance is improved. Link quality and channel capacity. Therefore, the cellular relay network can improve the coverage of the cell, enhance the capacity of the cell, and effectively meet the coverage requirements of the next generation mobile system for high-speed services in a wide range.

The problem that exists in the prior art is:

Multiple description video coding has been well studied, and there are many multiple description coding methods: multiple description quantization coding, transform-based MDC, forward error correction MDC and MDC based on quantization frame expansion. However, the existing MDC is generally only used in wired networks, because the premise of applying MDC is that there are multiple end-to-end transmission links in the network, and it is rarely used in wireless networks.

Contents of the invention

The invention provides a relay transmission method, system and equipment combined with multiple description features of information sources, which are used to improve the transmission efficiency of multimedia information in a wireless network and the robustness of the system.

The present invention provides a relay transmission method, which is applied to a network system including a base station, a plurality of relay stations, and a user terminal, and the method includes:

The relay station receives all the information sent by the base station that has undergone multi-description information source coding;

The relay station obtains the description stream corresponding to the relay group to which the device belongs and performs modulation and encoding according to the relay group to which the device belongs and all the information;

The relay station sends the modulated and coded description stream to the user terminal until the description stream reaches the user terminal.

Wherein, before the relay station receives all the information sent by the base station, it further includes:

Dividing multiple relay stations into different relay groups, the division of the relay groups is statically set, or dynamically adjusted according to a preset period; Corresponding multi-description information sources are coded, and the multi-description coding results are modulated and coded to obtain all information.

Wherein, the relay station obtains the description stream corresponding to the relay group to which the device belongs and performs encoding and modulation according to the relay group to which the device belongs and all the information, including:

The relay station decodes all received information to obtain bit stream information;

The relay station samples the bit stream information obtained by decoding with a known fixed description rule, and obtains a description stream corresponding to the relay group to which the device belongs;

The relay station modulates and encodes the obtained description stream.

Among them, also include:

According to the ratio of the number of bits of each description stream in the multiple description streams to the number of bits contained in the entire information, determine the link between the base station and the relay station, and the The modulation and coding scheme of the link between user terminals.

Among them, also include:

The user terminal performs multi-description-based decoding according to description streams received from different relay stations, obtains all information sent by the base station, and restores source multimedia content.

The present invention also provides a relay transmission system, including a base station, multiple relay stations and user terminals, wherein:

The base station is used to perform multi-description source coding on the source multimedia content to obtain all information and send it to all relay stations;

The relay station is configured to receive all information encoded by multiple description information sources sent by the base station; and obtain a description stream corresponding to the relay group to which it belongs according to the relay group to which it belongs and all the information; sending the obtained description stream to the user terminal until the description stream reaches the user terminal;

The user terminal is configured to perform multi-description-based decoding according to description streams received from different relay stations, obtain all information sent by the base station, and restore source multimedia content.

The present invention also provides a base station, the base station is applied in a network system including a base station, multiple relay stations and user terminals, and the base station includes:

a central scheduling unit, configured to receive the relay grouping result fed back by the relay station;

A multi-description information source encoding unit, configured to perform corresponding multi-description information source encoding on the source multimedia content according to the relay grouping result, and perform modulation and encoding on the multi-description encoding result;

A sending unit, configured to send all the modulated and coded information to all relay stations.

The present invention also provides a relay station, which is applied in a network system including a base station, multiple relay stations and user terminals, and the relay station includes:

a receiving unit, configured to receive all the information sent by the base station and encoded by multiple description sources;

A processing unit, configured to obtain a description stream corresponding to the relay group to which the device belongs and perform modulation and coding according to the relay group to which the device belongs and all information received by the receiving unit;

A sending unit, configured to send the description stream modulated and coded by the processing unit to the user terminal until the description stream reaches the user terminal.

Among them, also include:

A group determination unit, configured to obtain the relay group to which it belongs according to the division result of dividing a plurality of relay stations into different relay groups. Dynamic Adjustment.

Wherein, the processing unit is specifically used for:

Decode all received information to obtain bit stream information;

Sampling the bit stream information obtained by the decoding with a known fixed description rule to obtain a description stream corresponding to the relay group to which the device belongs;

Modulate and encode the obtained description stream.

Among them, also include:

A modulation and coding mode acquisition unit, configured to determine the link between the base station and the relay station according to the ratio of the number of bits of each description stream in the multiple description streams to the number of bits contained in the entire information Modulation and coding schemes of the road and the link between the relay station and the user terminal.

Compared with the prior art, the present invention has the following advantages:

By using the present invention, the transmission rate of the multimedia information and the robustness of the system can be effectively improved by using the relay transmission mode combined with the multi-description feature of the information source.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic diagram of a multi-description codec model in the prior art;

FIG. 2 is a schematic diagram of a cellular relay network in the prior art;

Fig. 3 is a flowchart of the relay transmission method provided in the present invention;

FIG. 4 is a schematic diagram of a network architecture of a two-hop relay network in an application scenario of the present invention;

FIG. 5 is a schematic diagram of the transmission scheme used when the RN works in the MDF mode in the application scenario of the present invention;

FIG. 6 is a schematic diagram of the transmission scheme used when the RN works in the DF mode in the application scenario of the present invention;

Fig. 7 is the TP _imag -SNR _{eNB_RN} curve obtained by simulation in the application scenario of the present invention;

Fig. 8 is the graph of TP _imag -SNR _{RN_UE} obtained by simulation in the application scenario of the present invention;

FIG. 9 is a schematic structural diagram of a base station provided in the present invention;

Fig. 10 is a schematic structural diagram of a relay station provided in the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It can be known from the understanding of multiple description coding in the prior art that in the process from sending to receiving between the base station and the user terminal, there must be two or more paths before the multiple description coding method can be used. With the emergence of the relay network, by placing multiple relays in the cell, there may be two or even more links between the base station and the user, which provides conditions for the application of multiple description coding in the relay network.

Based on this, the present invention provides a relay transmission method, which is applied to a network system including a base station, a plurality of relay stations, and a user terminal. As shown in FIG. 3 , the method includes:

Step s301, the relay station receives all the information encoded by the base station with multiple description sources;

Step s302, the relay station obtains the description stream corresponding to the relay group to which the device belongs and performs modulation and coding according to the relay group to which the device belongs and all information;

Step s303, the relay station sends the modulated and coded description stream to the user terminal until the description stream reaches the user terminal.

In an application scenario of the present invention, a schematic diagram of the network architecture of a two-hop relay network combined with source multi-description coding is shown in Figure 4, and a UE (User Equipment, user terminal) in the middle of a cell can directly receive an eNB (evolved NodeB, The information sent by the base station), and the UE at the edge of the cell is indirectly connected to the eNB through the transfer of the relay station (Relay Node, RN), and receives the forwarded data from the RN.

The specific implementation manner of the method provided in the present invention will be described below by taking the downlink as an example. Figure 4 shows a two-hop relay network. According to the description number N of multi-description coding, relays are divided into N groups, and relays in the same group forward description streams with the same number. It is assumed that the UE is far away from the eNB and needs to communicate with the eNB through a relay; MD represents the multi-description information coded by the multi-description information source, that is, all information; MD _i (i=1, 2, ..., N) is the multi-description code The i-th description flow of ; RN represents the relay station, and RN _i represents the relay station forwarding the i-th description flow.

In general, the eNB can set the relay grouping according to the feedback information of the UE, perform corresponding multi-description information source coding on the source multimedia content according to the relay grouping result, and perform modulation and coding on the multi-description coding result. For a broadcast network, since eNBs send information in groups and UEs have no feedback link, RNs with close physical locations can alternately belong to different groups. At this time, the eNB can obtain the relay grouping result through the relay fixed feedback signal, and the RN works in the MDF (Multiple Description Forward, multiple description decoding and forwarding) mode, and according to the pre-grouping settings of the RN, different groups of relays forward different numbers of Describes stream information. The image quality restored by the receiving end is measured by PSNR (Peak Signal to Noise Ratio, peak signal-to-noise ratio). The transfer happens in two phases:

In the first stage, the eNB uses the set modulation and coding methods: QM _eNB and Rate _eNB (respectively, the number of bits corresponding to the modulation method of the first hop transmission link, that is, the eNB to RN link, and the coding rate of channel coding) Send MD to ensure reception by central users and relay stations. RN _i decodes the received image information to obtain bit stream information.

In the second stage, RN _i obtains the corresponding description information of the relay from the decoded bit stream information, obtains the MD _i to be forwarded by itself, and uses the set modulation and coding method: QM _eNB and Rate _eNB (respectively the second hop transmission link, that is, the link from RN _i to UE, the number of bits corresponding to the modulation mode and the coding rate of channel coding) code and modulate MD _i , and then forward the corresponding result.

For the UE, no matter how many description streams it receives, it can decode and restore images of corresponding quality.

When the multi-description coding scheme is determined, the coding and modulation method corresponding to the two-hop link is determined as follows:

Assuming that the ratio of the number of bits of MD _i to image and video information after multi-description encoding is n to the bit number of all description streams after multi-description encoding, the first hop and the second hop chain are determined according to formula (1) The modulation and coding method of the channel.

η×QM _eNB /Rate _eNB = QM _RN /Rate _RN (1)

When the two are not completely equal, redundant information can be added to ensure that the symbol rates on the two links are consistent.

In a relay network, generally the link performance from eNB to RN is better than that from RN to UE. When the RN works in the DF (Decode and Forward, traditional decoding and forwarding) mode, in order to ensure the performance of the edge users accessed through the RN, a lower information rate is used in the transmission process of the second hop link, which also limits the The transmission rate of one hop will waste the capacity of the first hop link. When the RN works in the MDF mode, by matching the modulation and coding schemes of the first hop and the second hop link, the capacity of the two hop links is fully utilized, and the image transmission efficiency is improved under the premise of ensuring the user's receiving performance. efficiency.

In the following, the relay transmission scheme involved in the method provided by the present invention is simulated and the simulation results are described. RN performs multi-description coding and forwarding, which improves the transmission efficiency of images and videos while fighting against sudden network burst errors. Therefore, considering the efficiency and quality of sending image information comprehensively, a parameter TP _imag similar to the throughput is introduced for comprehensive characterization, which is defined as

TP _imag =L _imag ×(1-PER _imag )(2)

In formula (2):

L _imag characterizes the image size, which can be the number of column pixels, row pixels or total pixels of an image, and can also be expressed in a normalized form;

PER _imag =P(PSNR<PSNR _fix ), PSNR _fix is a set threshold, when the PSNR of the image received by the user satisfies PSNR<PSNR _fix , the image is considered unsatisfactory; otherwise, the image is considered successful.

For simplicity of description, without loss of generality, let the number of RNs accessed by the UE be 2, and the specific simulation parameters of multi-description flow N=2 are shown in Table 1.

Table 1 Simulation parameters

Number of eNB antennas 1 Number of RN antennas 1 Number of UE antennas 2 Multi-Description Coding Method Pixel-based odd-even framing, η is 0.5 The number of quantized bits of the pixel 4bit channel coding Turbo, code rate 1/3

Since the UE accesses two RNs, the RNs have two forwarding modes, MDF and DF. The corresponding simulation schemes are described as follows:

(1) When the RN works in the MDF mode, the schematic diagram of the transmission scheme used is shown in FIG. 5 . The eNB sends MD information in groups to ensure the reception of the central user and the relay station. The modulation method adopted is 16QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation), and the channel coding rate is Rate=1/3. RN demodulates and decodes the received information, and then performs multi-descriptive encoding η=0.5 on the source information, and forwards the corresponding numbered description stream according to RN's pre-set grouping settings, that is, RN ₁ forwards MD ₁ , and RN ₂ forwards MD ₂ . At this time, the modulation method adopted is changed to QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying), and the encoding rate remains unchanged. The UE demodulates and decodes the received signal and combines multiple descriptions. Since the amount of information data will be half after multi-description coding, the symbol rates of the first-hop and second-hop links remain unchanged.

(2) When the RN works in the DF mode, the transmission scheme used is shown in the schematic diagram of FIG. 6 . The eNB sends MD information in groups to ensure the reception of the central user and the relay station. The modulation method adopted is QPSK, and the rate is Rate=1/3. The RN forwards the received information through DF, and at this time, the modulation and coding mode of the link from the RN to the UE is the same as that of the link from the eNB to the RN. The UE performs soft information combination on the received information to obtain diversity gain.

In general, the link quality of the first hop is generally better than that of the second hop link, that is, the SNR _{eNB_RN} (SNR of the link from eNB to RN) is greater than the SNR _{RN_UE} (SNR of the link from RN to UE). Therefore, the SNR of the two-hop link is set in the following two ways:

The first way:

SNR _{eNB_RN} - SNR _{RN_UE} = 5dB

The obtained TP _imag -SNR _{eNB_RN} curve is shown in FIG. 7 . Where PSNR _fix = 24 and 26, under the quantization mode in the application scene of the present invention, it satisfies the PSNR threshold of the user's subjective viewing effect.

The second way:

SNR _{eNB_RN} = 20dB

The obtained TP _imag -SNR _{RN_UE} curve is shown in Figure 8. Where PSNR _fix = 24 and 26, under the quantization mode in the application scene of the present invention, it satisfies the PSNR threshold of the user's subjective viewing effect.

It can be seen from FIG. 7 that when SNR _{eNB_RN} −SNR _{RN_UE} =5 dB, when SNR _{eN_BN} reaches 20 dB, the performance of RN working in MDF mode is better than that of RN working in DF mode. It can be seen from Fig. 8 that when SNR _{eNB_RN} = 20dB, when SNR _{RN_UE} reaches 15dB, the performance of RN working in MDF mode is better than that of RN working in DF mode, which is consistent with the conclusion in Fig. 7 . Therefore, in the relay network, when the link quality of the second hop is better (higher SNR _{RN_UE} ), the relay works in the multi-description coding and forwarding mode, which can effectively improve the throughput of edge users.

In the above application scenarios, a two-hop relay network is taken as an example to describe the specific implementation manner of the present invention. When the number of relays in the network is large and the number of relay nodes that users can access increases, other multiple description encoding methods can be used so that the number of encoded multiple description streams is the same as the number of relay packets. In addition, the modulation and coding schemes for the link between the base station and the relay and the link between the relay and the user can still be determined by the aforementioned formula (1).

By using the above-mentioned method provided by the present invention and using the relay transmission mode combined with multiple description features of information sources, the transmission rate of multimedia information and the robustness of the system can be effectively improved. The transmission method based on multi-description information source coding provided in the present invention has strong foresight and applicability especially for the transmission of broadcasting services in the application of the wireless cellular network.

The present invention also provides a relay transmission system, including a base station, multiple relay stations and user terminals, wherein:

The base station is used to perform multi-description source coding on the source multimedia content to obtain all information and send it to all relay stations;

The relay station is used to receive all the information encoded by the multi-description information source sent by the base station; and obtain the description stream corresponding to the relay group to which it belongs according to the relay group to which it belongs and all the information; send the obtained description stream to the user terminal, Until the description flow reaches the user terminal;

The user terminal is used to perform multi-description-based decoding according to the description streams received from different relay stations, obtain all the information sent by the base station and restore the source multimedia content.

The present invention also provides a base station, which is applied to a network system including a base station, multiple relay stations, and user terminals. As shown in FIG. 9, the base station includes:

The central scheduling unit 10 is configured to receive the relay grouping result fed back by the relay station;

The multi-description information source encoding unit 20 is used to perform corresponding multi-description information source encoding on the source multimedia content according to the relay grouping result, and perform modulation and encoding on the multi-description encoding result;

The sending unit 30 is configured to send all the modulated and coded information to all relay stations.

The present invention also provides a relay station, which is applied to a network system including a base station, multiple relay stations and user terminals. As shown in FIG. 10 , the relay station includes:

A receiving unit 40, configured to receive all the information sent by the base station and encoded by multiple description sources;

The processing unit 50 is configured to obtain the description stream corresponding to the relay group to which the device belongs according to the relay group to which the device belongs and all the information received by the receiving unit 10-, and perform modulation and coding; specifically, the processing unit 50 Decoding all the information received by the base station to obtain bit stream information; then sampling the decoded bit stream information with known fixed description rules to obtain the description stream corresponding to the relay group to which the device belongs; finally The description stream corresponding to the relay group to which the device belongs is modulated and coded.

The sending unit 60 is configured to send the description stream acquired by the processing unit 50 to the user terminal until the description stream reaches the user terminal.

Among them, also include:

The group determination unit 70 is configured to obtain the relay group to which it belongs and provide it to the processing unit 50 according to the division result of dividing a plurality of relay stations into different relay groups. The division mode of the relay group is statically set, or according to The preset cycle is dynamically adjusted. For example, in a broadcast network, since the base station transmits information in groups and the UE has no feedback link, RNs with close physical locations can alternately belong to different groups.

Modulation and coding mode acquisition unit 80, used to determine the link between the base station and the relay station, and the link between the relay station and the user terminal according to the ratio of the number of bits of each description stream in the multiple description streams to the number of bits contained in all information The modulation and coding method of the link between them. And provide the obtained modulation and coding scheme to the receiving unit 40 , the processing unit 50 and the sending unit 60 .

By using the above-mentioned system and equipment provided by the present invention, the transmission rate of image information and the robustness of the system can be effectively improved by using the relay transmission mode combined with multiple description features of information sources. The transmission method based on multi-description information source coding provided in the present invention has strong foresight and applicability especially for the transmission of broadcasting services in the application of the wireless cellular network.

Through the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be realized by hardware, or by software plus a necessary general hardware platform. Based on this understanding, the technical solution of the present invention can be embodied in the form of software products, which can be stored in a non-volatile storage medium (which can be CD-ROM, U disk, mobile hard disk, etc.), including several The instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments of the present invention.

Those skilled in the art can understand that the drawing is only a schematic diagram of a preferred embodiment, and the units or processes in the drawing are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the units in the device in the embodiment can be distributed in the device in the embodiment according to the description in the embodiment, and can also be changed and located in one or more devices different from the device in the embodiment. The units in the above embodiments can be combined into one unit, and can also be further divided into multiple subunits.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

Claims (11)

1. the relay transmission method of a combining multi-description characteristics of information source is characterized in that, is applied to comprise that described method comprises in the network system of base station, a plurality of relay station and user terminal:

Described relay station receives the full detail that warp that described base station sends is too much described source encoding;

Described relay station is according to relay for packets under this equipment and described full detail, obtain with this equipment under the corresponding description stream of relay for packets and carry out modulating-coding;

The description of described relay station after with described modulating-coding flows to user terminal and sends, and flows to until described description to reach described user terminal.

2. the method for claim 1 is characterized in that, described relay station also comprises before receiving the full detail of described base station transmission:

A plurality of relay stations are divided into the relay for packets that belongs to different, and the dividing mode of described relay for packets is static the setting, or dynamically adjusts according to preset period; Described base station carries out the source content of multimedia correspondingly to describe source encoding according to described relay for packets result more, and multiple description coded result is carried out modulating-coding obtains full detail.

3. the method for claim 1 is characterized in that, described relay station is according to relay for packets under this equipment and described full detail, obtain with this equipment under the corresponding description stream of relay for packets and carry out coded modulation, comprising:

Described relay station is decoded to the full detail that receives, and obtains bit stream information;

Described relay station carries out the sampling that known fixed is described rule to the bit stream information that described decoding obtains, obtain with this equipment under the corresponding description of relay for packets stream;

Described relay station carries out modulating-coding to the described description stream that gets access to.

4. method as claimed in claim 3 is characterized in that, also comprises:

According to the described bit numbers of describing each bar description stream in the stream more, with ratio, determine to arrive to link between the described relay station and described relay station the modulation coding mode of the link between the described user terminal in described base station to the contained bit number of described full detail.

5. the method for claim 1 is characterized in that, also comprises:

Described user terminal carries out the decoding based on many descriptions according to the description stream that receives from different relay stations, obtains the full detail and the source content of multimedia that reduces that described base station sends.

6. a relay transmission system is characterized in that, comprises base station, a plurality of relay station and user terminal, wherein:

Described base station is used for the source content of multimedia is carried out obtaining full detail after many description source encodings, and sends to all relay stations;

Described relay station is used to receive the full detail that warp that described base station sends is too much described source encoding; And, obtain and the described affiliated corresponding description stream of relay for packets according to affiliated relay for packets and described full detail; Described description of obtaining is flowed to user terminal send, flow to until described description and reach described user terminal;

Described user terminal is used for carrying out the decoding based on many descriptions according to the description stream that receives from different relay stations, obtains the full detail and the source content of multimedia that reduces that described base station sends.

7. a base station is characterized in that, described base station applies is in the network system that comprises base station, a plurality of relay station and user terminal, and described base station comprises:

The central dispatching unit is used to receive the relay for packets result that relay station feeds back;

The source encoding unit of describing are used for the source content of multimedia is carried out corresponding many description source encodings according to described relay for packets result, and multiple description coded result are carried out modulating-coding more;

Transmitting element is used for being sent to all relay stations with described through the full detail behind the modulating-coding.

8. a relay station is characterized in that, described relay station is applied to comprise that described relay station comprises in the network system of base station, a plurality of relay station and user terminal:

Receiving element is used to receive the full detail that warp that described base station sends is too much described source encoding;

Processing unit is used for the full detail that receives according to the relay for packets under this equipment and described receiving element, obtain with this equipment under the corresponding description stream of relay for packets and carry out modulating-coding;

Transmitting element is used for that the description behind the described processing unit modulating-coding is flowed to user terminal and sends, and flows to until described description to reach described user terminal.

9. relay station as claimed in claim 8 is characterized in that, also comprises:

The grouping determining unit is used for according to the division result who a plurality of relay stations is divided into the relay for packets that belongs to different, obtains self affiliated relay for packets, and the dividing mode of described relay for packets is static the setting, or dynamically adjusts according to preset period.

10. relay station as claimed in claim 8 is characterized in that, described processing unit specifically is used for:

The full detail that receives is decoded, obtain bit stream information;

The bit stream information that described decoding obtains is carried out the sampling that known fixed is described rule, obtain with this equipment under the corresponding description of relay for packets stream;

The described description stream that gets access to is carried out modulating-coding.

11. the relay station described in claim 9 is characterized in that, also comprises:

The modulation coding mode acquiring unit, be used for according to the described bit numbers that each bar of stream is described stream of describing more, with ratio, determine to arrive to link between the described relay station and described relay station the modulation coding mode of the link between the described user terminal in described base station to the contained bit number of described full detail.

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