CN101047423B - Multi-user radio relay method and system - Google Patents
Multi-user radio relay method and system Download PDFInfo
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Abstract
The invention relates to a radio relaying method of multi-user and a system, which adds a detection unit of channel quality information (CQI) in a downlink transmission frame of a base station, including: adding CQI detection frame in the transmission frame and forwarding frame of the downlink transmission frame; a relay user receiving the downlink transmission frame of the base station, and saving data of part of target users according to one of the following standards: the fading of a sub-carrier where the kept data is in a frequency selectively fading channel being less than a threshold; or at most keeping the user data with most quality and set number, and the fading which the data comes through being less than the threshold; or only keeping the user data capable of correctly decoding; during the CQI detection phase corresponding to the CQI detection frame, the relay user receiving pilot signals or spreading codes which don't include the data and are sent by different target users which don't correctly receive the data in the transmission frame, and measuring the CQI between the relay user and the different target users, selecting the target user with the CQI greater than the threshold, and forwarding the data to the selected target user. The invention utilizes the diversity technology to reduce the error propagation and power consumption.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly based on the wireless communication system of relaying, concrete is a kind of multi-user radio trunking method and system.
Background technology
The relative 3-G (Generation Three mobile communication system) of following (B3G or 4G) GSM all will have qualitative leap in technology with using.In order to adapt to the future broadband wireless communication systems High Data Rate, the basic demand of high real-time and low error rate, some new technology are introduced in the wireless communication system, and the wireless relay technology is exactly one of them.
The distance of the decay of radio signal power and its propagation is exponent function relation substantially.In the wireless communication system of honeycomb system, the decay of radio signal has directly determined single honeycomb grid, the i.e. size of the coverage of a base station.And that the user that the characteristic of exponential damping has determined at center of housing estate can receive is very high, even is higher than the radio signal of standard, and on the contrary, the user of cell edge can only receive faint signal, has influenced service quality.Simultaneously, even exponential damping causes in the very big transmitting power of center of housing estate increase, the improvement of cell edge signal quality is also very little.As shown in Figure 1, for the problem that existing sub-district system wireless communication system faces, from figure, can see, along with the increasing of base station distance, active volume reduces rapidly, at the cell boarder place decay very serious, problem can be than deterioration more in 2005 during by 2010.
In the wireless communication system in future, the user of cell edge also can require more intense signal, and existing sub-district system wireless communication system is difficult to meet the demands.If reduce the area coverage and the radius of single base station, then the cost of network laying can improve greatly.In order to increase the covering of sub-district with lower cost, the service quality of Cell Edge User is provided, a kind of network architecture based on wireless relay becomes the basis of following radio communication.
As shown in Figure 2, be wireless communication system based on wireless relay, wherein, the signal of base station (BS) emission is exaggerated through relay point (RN), serves relay point user on every side.Signal can also pass through a plurality of relay points and amplify, and reaches the place far from the base station.The cost of relay point is much smaller than the base station, and therefore overall cost is less than simply dwindling the sub-district area.Owing to be wireless trunking scheme, the setting of relay point and change are more flexible in addition.As shown in Figure 3, be the improvement of relaying to sub-district service quality.
Based on the network architecture of this wireless relay, the mobile device that WINNER (Wireless World Initiative New Radio) has proposed to utilize the user is as relaying.Wherein WINNER is that European Union provides funds, and the research project that telecommunications manufacturer is leading is mainly studied next generation wireless communication system air interface technologies.Wireless communication system based on relaying there is more deep research.
Multi-user diversity relaying (IMDR in the WINNER project; Induced Multi-user Diversity Relaying) be meant, many user, in the application of transmission environment more complicated; As indoor; Can use subscriber equipment to carry out relaying, avoid the shadow region that signal can't cover occurring, reach the purpose of improving overall quality of service.
As shown in Figure 4, be the transmission means of IMDR.The IDMR technology is mainly used in the downlink data transmission of base station to the user.This technology is divided into two parts with the downlink data transmission frame, and first is called transmission (Feeding) frame, and corresponding transmit stage is called the transmission stage; Second frame is called forwarding (Delivery) frame, and the corresponding stage is called the forwarding stage.In the transmission stage, the base station is with the transmitting power of maximum, and maximum transmission rate is to all users broadcasting targeted customers' data.In the forwarding stage, will redispatch away at the signal that receive previous stage as the user of relaying.As shown in Figure 5, be the structure of base station to user's downlink data transmission frame, sending between (Feeding) frame and forwarding (Delivery) frame with time τ
sSeparate.Data between the different target user use different spreading codes to distinguish, i.e. code division multiple access (CDMA).The targeted customer possibly receive the data of oneself in transmission stage and forwarding stage, has reduced the possibility of loss of data.
Though adopt the IMDR technology to improve the quality of sub-district service, still exist following shortcoming:
1) in " Feeding " stage, may not correctly receive the data that send the base station as trunk subscriber, then send wrong data and just cause the propagation of error code and the rising of the error rate in " Delivery " stage.
2) in " Delivery " stage, the unclear channel situation each other of user is difficult to utilize diversity technique.
3) in " Delivery " stage, the signal of the different quality of a plurality of relayings arrives the targeted customer simultaneously, and just simple superposition causes power dissipation, has reduced the stand-by time of equipment.
Therefore, need a kind of trunking method that can effectively utilize the multi-user of diversity gain, solve above-mentioned problem.
Summary of the invention
Problem to above-mentioned IMDR technology existence; The object of the present invention is to provide a kind of multi-user radio trunking method and system; In order to reduce the propagation of error code, the power consumption that reduces trunk subscriber reaches the interference to neighbor cell, and makes full use of space diversity; Multi-user diversity and time diversity technique are to effectively utilize diversity gain.
Technical scheme of the present invention is: a kind of multi-user radio trunking method, wherein:
In the downlink transmission frame of base station, add the channel quality information probe portion, comprising: between the transmit frame of said downlink transmission frame and transmitted frame, add the channel quality information explore frame;
Send the stage accordingly at said transmit frame; Trunk subscriber receives the downlink transmission frame that send the base station, and preserves part targeted customer's data according to one of following standard: the decline of the residing subcarrier of the part targeted customer's of reservation data in frequency selective fading channels is less than preset threshold; Perhaps, at most only keep a top-quality G user's data, the decline that these data experienced simultaneously is less than pre-set threshold, and described G is predefined numerical value; Perhaps only keep the user's data that correctly to decode;
In the said channel quality information explore frame corresponding channel quality information detection phase; Trunk subscriber is received in pilot signal that does not comprise data or the spreading code that the different target user that correctly do not receive data in the transmit frame sends; And measure the channel quality information CQI between itself and the said different target user, select CQI greater than the targeted customer who preestablishes threshold value;
Transmit the stage accordingly at said transmitted frame, trunk subscriber is transmitted data to the targeted customer who selects.
Said transmit frame, transmitted frame and channel quality information explore frame separate with the time interval between frame and the frame.
The said targeted customer's pilot signal transmitted on one's own sub-carrier positions that in transmit frame, does not correctly receive data; The perhaps said targeted customer who in transmit frame, does not correctly receive data sends spreading code.
Described trunk subscriber adopts and divides collection to transmit data to the targeted customer who selects.
Described trunk subscriber carries out Space Time Coding to the data of transmitting, and uses the many antennas of multiple-input and multiple-output to launch, and each trunk subscriber is selected a branch road of Space Time Coding at random.
The said targeted customer who in transmit frame, does not correctly receive data receives the different propagation paths from different trunk subscribers, the data of different Space Time Coding branch, and these data are merged; Or oneself the data that targeted customer's own data that will directly receive from the base station and trunk subscriber forwarding come merge.
Method of the present invention comprises following concrete steps: described base station is sent target user data according to certain transmission rate (optimum scheme is a maximum transmission rate) to its all users with certain transmitting power; After described trunk subscriber receives downlink data, decline is stored less than the targeted customer's of setting threshold data; In transmit frame, correctly do not receive targeted customer's pilot signal transmitted on one's own sub-carrier positions of data, be used for trunk subscriber measure channel quality information; Described trunk subscriber receives different target user's pilot signal, and measures the channel quality information between said trunk subscriber and the different target user, the selective channel quality information greater than the user of setting threshold as the targeted customer; Described trunk subscriber is transmitted data to the targeted customer who selects; Wherein: described trunk subscriber utilizes channel quality information that the data of transmitting are carried out Space Time Coding; And adopting the many antennas of multiple-input, multiple-output to send, each trunk subscriber is selected a branch road of Space Time Coding at random; Described targeted customer receives the different propagation paths from different trunk subscribers, the data of different Space Time Coding branch, and these data are merged; Or oneself the data that targeted customer's own data that will directly receive from the base station and trunk subscriber forwarding come merge.
The present invention also provides a kind of multi-user radio relay system, comprises, and base station and user terminal, described base station and user terminal link; Described base station has the downlink data generation unit, is used to generate the downlink data that includes the channel quality information explore frame; Described user terminal comprises: the target user data memory cell is used for preserving according to one of following standard part targeted customer's data: the residing subcarrier of the part targeted customer's of reservation data in the decline of frequency selective fading channels less than preset threshold; Perhaps, at most only keep a top-quality G user's data, the decline that these data experienced simultaneously is less than pre-set threshold, and described G is predefined numerical value; Perhaps only keep the user's data that correctly to decode; Targeted customer's selected cell; Be used for being received in pilot signal that does not comprise data or spreading code that different target user that transmit frame correctly do not receive data sends; And measure the channel quality information between itself and the said different target user, the selective channel quality information greater than the user of threshold value as the targeted customer; The transmit diversity unit utilizes channel quality information that the data of transmitting are carried out Space Time Coding, and adopts the multiple-input, multiple-output multi-antenna technology to send, and each trunk subscriber is selected a branch road of Space Time Coding at random; Merge device, be used to receive data, and these data are merged from base station and different trunk subscribers.
Described user terminal also comprises: the pilot signal transmitting element is used for pilot signal transmitted on sub-carrier positions.
Described user terminal also comprises: the spreading code transmitting element is used to send the spreading code of code division multiple access mode.
Beneficial effect of the present invention is not only have the advantage of prior art IMDR scheme, and has overcome the shortcoming of IMDR, and specifically following beneficial effect is arranged:
In the transmission stage, trunk subscriber is not to transmit all data but only keep reliablely, has avoided the propagation of error code and the rising of the error rate;
In the CQI detection phase, the targeted customer who in transmit frame, does not correctly receive data launches pilot signal, and the targeted customer who in transmit frame, correctly receives data does not launch pilot signal, can reduce the expense that trunk subscriber sends.In addition, trunk subscriber is through the estimated channel situation, and a measured targeted customer of selective channel matter transmits data, has reduced the energy consumption of trunk subscriber and to the interference of neighbor cell, and has reduced the possibility of error code;
In the forwarding stage; According to the channel conditions that estimates, trunk subscriber carries out Space Time Coding to the data of transmitting, and utilizes the abundant implementation space Fen Ji of MIMO multi-antenna technology; Effectively utilized diversity gain; Even have only a trunk subscriber, the targeted customer also can receive complete data, does not just have diversity gain.
Description of drawings
Fig. 1 be in the prior art in the wireless communication system along with the graph of relation of actual active volume of the increasing of base station distance and demand capacity;
Fig. 2 is based on the wireless communication system sketch map of relaying in the prior art;
Fig. 3 is for utilizing in the prior art behind the relaying along with the curve chart that improves with the increasing service quality of base station distance;
Fig. 4 is the transmission system annexation figure of multi-user diversity relaying (IMDR) in the prior art;
Fig. 5 is the structure chart of base station down frame in the prior art;
Fig. 6 is a system of the present invention annexation sketch map;
Fig. 7 is the structure chart of base station down frame of the present invention;
Fig. 8 is the flow chart of the specific embodiment of the invention;
Fig. 9 is the structured flowchart of system of the present invention embodiment;
Figure 10 is the structured flowchart of user terminal in the specific embodiment of the invention.
Embodiment
Below in conjunction with description of drawings embodiment of the present invention.The present invention aims to provide a kind of method and system of multi-user radio relaying; In the downlink transmission frame of base station, add the channel quality information probe portion; Be used to make trunk subscriber through measuring the channel quality information between itself and a plurality of targeted customer; Select the qualified targeted customer of channel quality, and the data of sending to the qualified targeted customer's repeating base station of channel quality.To improve the service quality of sub-district.
As shown in Figure 6, the base station is sent target user data with certain transmitting power and transmission rate to its all users; Trunk subscriber is transmitted data to the targeted customer who selects after receiving downlink data; Wherein: described trunk subscriber utilizes channel quality information that the data of transmitting are carried out Space Time Coding; And adopting the many antennas of multiple-input, multiple-output to send, each trunk subscriber is selected a branch road of Space Time Coding at random; Described targeted customer receives the different propagation paths from different trunk subscribers, the data of different Space Time Coding branch, and these data are merged; Or oneself the data that targeted customer's own data that will directly receive from the base station and trunk subscriber forwarding come merge.
As shown in Figure 7, in user's downlink data transmission process, the downlink data transmission frame is divided into three parts in the base station, first is called transmission (Feeding) frame, and corresponding transmit stage is called the transmission stage; Second portion is called channel quality information and surveys (CQI Probing) frame, and corresponding transmit stage is called the channel quality information detection phase; Third part is called forwarding (Delivery) frame, and corresponding transmit stage is called the forwarding stage.Between three phases with time τ
sSeparate.
In the transmission course of whole data; Data separation between the different target user has following two kinds of situation; That is: used modulation system is OFDM; Then each targeted customer's data take a part of subcarrier in all subcarriers, distinguish the targeted customer according to the subcarrier difference of each CU; Perhaps, use CDMA to distinguish the targeted customer, use different spreading codes to distinguish the targeted customer according to each targeted customer, and can be according to the difference of data traffic, each user uses number and the spreading code that is uneven in length.
In the transmission stage, targeted customer's data are sent in the base station to all users with certain transmitting power and certain transmission rate.After receiving data as the user of relaying; Can select data according to a kind of reserve part targeted customer of coming in two kinds of following standards in the memory cell of oneself, that is: the decline of the residing subcarrier of the part targeted customer's of reservation data in frequency selective fading channels is less than preset threshold; Perhaps, at most only keep a top-quality G user's data, the decline that these data experienced simultaneously is less than pre-set threshold, and described G is predefined numerical value; Perhaps only keep the user's data that correctly to decode.
In the CQI detection phase; In transmit frame, correctly do not receive the datum target user and send the signal do not comprise data, trunk subscriber receives the signal that the different target user sends, and measures the CQI between itself and the different target user; Select CQI greater than the user who preestablishes threshold value as the targeted customer; Wherein, the signal that described targeted customer sends can be the pilot signal of OFDM modulation, also can be the spreading code among the CDMA.
In the forwarding stage; Trunk subscriber is transmitted selected targeted customer's data; If by transmitting the data that belong to same targeted customer simultaneously more than a trunk subscriber; Then can utilize known channel information, data are carried out Space Time Coding and used the MIMO multi-antenna technology to send, each trunk subscriber is selected a branch road of Space Time Coding at random.The targeted customer receives from different trunk subscribers, different propagation paths, and the data of oneself that the data of different Space Time Coding branch and targeted customer received in the transmission stage, and these data are merged.
Embodiment 1:
When adopting the OFDM modulation system, the base station comprises the steps: to user's downlink data transmission process
Step 1, in the transmission stage, targeted customer's data are sent in the base station to all users with certain transmitting power and transmission rate.Wherein, used modulation system is OFDM, and promptly each targeted customer's data take a part of subcarrier in all subcarriers, and the subcarrier of each CU is different.
Step 2, can receive the data that send the base station all users of transmission stage.After receiving data as the user of relaying, the data that only keep several targeted customers are in the memory cell of oneself.The standard that keeps is that the decline of the residing subcarrier of these user's data in frequency selective fading channels is less than threshold value C
1
Step 3, in the CQI detection phase, in transmit frame, correctly do not receive the signal that the datum target user sends OFDM modulation, this signal does not comprise data.Wherein, each user is pilot signal transmitted on one's own sub-carrier positions, and the pilot signal that each user sends is identical, and sub-carrier positions is different, on other subcarrier, does not send any information.
Step 4, in the CQI detection phase, receive the signal that the different target user sends as the user of relaying, the CQI between the pilot measurement through diverse location in the OFDM symbol itself and the different target user selects CQI greater than threshold value C
2The user as the targeted customer.
Step 5, in the forwarding stage, the data-modulated mode of transmitting the part targeted customer as the user of relaying is OFDM, the corresponding subcarrier of the data of not transmitting uses lowest power.Because the pilot tone CQI detection phase targeted customer just in time is on the corresponding subcarrier of its data, estimate that the CQI that comes out can directly use the forwarding stage.In this stage, several trunk subscribers possibly transmitted simultaneously and belong to same user's data, and these trunk subscribers are equivalent to constitute spaced antenna.
Step 6, in the forwarding stage; In order further to utilize known channel information; Trunk subscriber can also utilize estimated channel information that data are carried out suitable conversion; Can also carry out Space Time Coding and use the MIMO multi-antenna technology to send, each trunk subscriber is selected a branch road of Space Time Coding at random.
Step 7, in the forwarding stage, the targeted customer receives from different trunk subscribers, different propagation paths, the data of different Space Time Coding branch merge these data.If the targeted customer has received oneself data in the transmission stage, then also can merge with the data that the forwarding stage receives.
As shown in Figure 8, the flow process of the specific embodiment of the invention is: described base station is sent target user data with certain transmitting power and transmission rate to its all users; After described trunk subscriber receives downlink data, correct decoding or decline are stored less than the targeted customer's of setting threshold data; Each targeted customer is pilot signal transmitted on one's own sub-carrier positions, is used for trunk subscriber measure channel quality information; Described trunk subscriber receives different target user's pilot signal, and measures the channel quality information between said trunk subscriber and the different target user, the selective channel quality information greater than the user of setting threshold as the targeted customer; Described trunk subscriber is transmitted data to the targeted customer who selects; Wherein: described trunk subscriber utilizes channel information that the data of transmitting are carried out suitable conversion; Or the data of transmitting are carried out Space Time Coding; And adopting the many antennas of multiple-input, multiple-output to send, each trunk subscriber is selected a branch road of Space Time Coding at random; Described targeted customer receives the different propagation paths from different trunk subscribers, the data of different Space Time Coding branch, and these data are merged; Or oneself the data that targeted customer's own data that will directly receive from the base station and trunk subscriber forwarding come merge.
Embodiment 2:
When adopting the CDMA dividing multi-user, the base station comprises the steps: to user's downlink data transmission process
Step 1 ', in the transmission stage, targeted customer's data are sent in the base station to all users with certain transmitting power and transmission rate.Data between the different target user use the spreading code of CDMA to distinguish, and according to the difference of data traffic, each user can use number and the spreading code that is uneven in length.
Step 2 ', in the transmission stage, all users can receive the data that send the base station.After receiving data as the user of relaying, the data that only keep several targeted customers are in the memory cell of oneself.The standard that keeps is: at most only keep a top-quality G user's data, the decline that these user data experienced simultaneously is less than pre-set threshold C
1
Step 3 ', in the CQI detection phase, in transmit frame, correctly do not receive the datum target user and send different spreading codes.
Step 4 ', in the CQI detection phase; User as relaying receives the spreading code that the different target user sends; And according to the different spreading codes that receive estimate with the different target user between CQI, selection CQI greater than the user who preestablishes threshold value C2 as the targeted customer.
Step 5 ', in the forwarding stage, trunk subscriber can also carry out Space Time Coding and use the MIMO multi-antenna technology to send data.Several trunk subscribers possibly transmitted simultaneously and belong to same user's data, and these trunk subscribers are equivalent to constitute spaced antenna.
Step 6 ', in the forwarding stage, the targeted customer receives from different trunk subscribers, the data of different propagation paths merge these data.If the targeted customer has received oneself data in the transmission stage, then also can merge with the data that the forwarding stage receives.
Embodiment 3
As shown in Figure 9, for a kind of multi-user radio relay system, comprise, base station and user terminal, described base station and user terminal link; Described base station has the downlink data generation unit, is used to generate the downlink data that includes the channel quality information explore frame; Shown in figure 10, described user terminal comprises: the target user data memory cell is used for selectively preserving part targeted customer's data; Targeted customer's selected cell, be used for the selective channel quality information greater than the user of threshold value as the targeted customer; The transmit diversity unit utilizes channel quality information that the data of transmitting are carried out Space Time Coding, and adopts the multiple-input, multiple-output multi-antenna technology to send, and each trunk subscriber is selected a branch road of Space Time Coding at random; Merge cells is used to receive the data from base station and different trunk subscribers, and these data is merged.
Described user terminal also comprises: the pilot signal transmitting element is used for pilot signal transmitted on sub-carrier positions.The spreading code transmitting element is used to send the spreading code of code division multiple access mode.
User terminal shown in Figure 10 both can be used as the trunk subscriber terminal and also can be used as target terminal user.
Wherein, in user's downlink data transmission, the base station generates the downlink data that includes the channel quality information explore frame with certain transmitting power according to certain transmission rate through the downlink data generation unit in the base station; And send targeted customer's data to all users;
After receiving data as the user of relaying, through the target user data memory cell, reserve part targeted customer's data are in the memory cell of oneself;
Described targeted customer sends the signal that does not comprise data through the pilot signal transmitting element, is used for trunk subscriber measure channel quality information;
Described trunk subscriber receives the signal that the different target user sends; Measure the channel quality information between itself and the different target user through targeted customer's selected cell, and according to channel quality information selective channel quality information greater than the user who preestablishes threshold value as the targeted customer;
Trunk subscriber utilizes known channel quality information; Use the transmit diversity unit that data are carried out Space Time Coding and used the multiple-input and multiple-output multi-antenna technology to send; Implementation space Fen Ji, wherein, each trunk subscriber is selected a branch road of Space Time Coding at random;
The targeted customer receives from different trunk subscribers, different propagation paths, and the data of different Space Time Coding branch, oneself the data of using that merge cells receives these data and targeted customer merge.
Beneficial effect of the present invention is not only have the advantage of prior art IMDR scheme, and has overcome the shortcoming of IMDR, and specifically following beneficial effect is arranged:
In the transmission stage, trunk subscriber is not to transmit all data but only keep reliablely, has avoided the propagation of error code and the rising of the error rate;
In the CQI detection phase, trunk subscriber is through the estimated channel situation, and a measured targeted customer of selective channel matter transmits data, has reduced the energy consumption of trunk subscriber and to the interference of neighbor cell, and has reduced the possibility of error code;
In the forwarding stage, according to the channel conditions that estimates, trunk subscriber carries out Space Time Coding to the data of transmitting; Utilize the abundant implementation space Fen Ji of MIMO multi-antenna technology; Effectively utilized diversity gain, even have only a trunk subscriber, the targeted customer also can receive complete data.
Above embodiment only is used to explain the present invention, but not is used to limit the present invention.
Claims (12)
1. multi-user radio trunking method is characterized in that:
In the downlink transmission frame of base station, add the channel quality information probe portion, comprising: between the transmit frame of said downlink transmission frame and transmitted frame, add the channel quality information explore frame;
Send the stage accordingly at said transmit frame; Trunk subscriber receives the downlink transmission frame that send the base station, and preserves part targeted customer's data according to one of following standard: the decline of the residing subcarrier of the part targeted customer's of reservation data in frequency selective fading channels is less than preset threshold; Perhaps, at most only keep a top-quality G user's data, the decline that these data experienced simultaneously is less than pre-set threshold, and described G is predefined numerical value; Perhaps only keep the user's data that correctly to decode;
In the said channel quality information explore frame corresponding channel quality information detection phase; Trunk subscriber is received in pilot signal that does not comprise data or the spreading code that the different target user that correctly do not receive data in the transmit frame sends; And measure the channel quality information CQI between itself and the said different target user, select CQI greater than the targeted customer who preestablishes threshold value;
Transmit the stage accordingly at said transmitted frame, trunk subscriber is transmitted data to the targeted customer who selects.
2. method according to claim 1 is characterized in that, said transmit frame, transmitted frame and channel quality information explore frame separate with the time interval between frame and the frame.
3. method according to claim 1 is characterized in that, the said targeted customer's pilot signal transmitted on one's own sub-carrier positions that in transmit frame, does not correctly receive data; Perhaps described targeted customer sends spreading code.
4. method according to claim 3; It is characterized in that; The said targeted customer who in transmit frame, has correctly received data is pilot signal transmitted on one's own sub-carrier positions not; The base station is looked this parton carrier resource and is discharged, and in transmitted frame, utilizes these sub-carrier resources to send new data.
5. method according to claim 1 is characterized in that, described trunk subscriber adopts and divides collection to transmit data to the targeted customer who selects.
6. method according to claim 5 is characterized in that, described trunk subscriber carries out Space Time Coding to the data of transmitting, and uses the many antennas of multiple-input and multiple-output to launch, and each trunk subscriber is selected a branch road of Space Time Coding at random.
7. method according to claim 6 is characterized in that, the said targeted customer who in transmit frame, does not correctly receive data receives the different propagation paths from different trunk subscribers, the data of different Space Time Coding branch, and these data are merged; Or oneself the data that targeted customer's own data that will directly receive from the base station and trunk subscriber forwarding come merge.
8. method according to claim 1 is characterized in that comprising following concrete steps:
Described base station is sent target user data with certain transmitting power and certain transmission rate to its all users;
After described trunk subscriber receives downlink data, decline is stored less than the targeted customer's of setting threshold data;
Each does not correctly receive data in transmit frame targeted customer's pilot signal transmitted on one's own sub-carrier positions is used for trunk subscriber measure channel quality information;
Described trunk subscriber receives different target user's pilot signal, and measures the channel quality information between said trunk subscriber and the different target user, the selective channel quality information greater than the user of setting threshold as the targeted customer;
Described trunk subscriber is transmitted data to the targeted customer who selects; Wherein: described trunk subscriber utilizes channel quality information that the data of transmitting are carried out conversion; Perhaps carry out Space Time Coding; And adopting the many antennas of multiple-input, multiple-output to send, each trunk subscriber is selected a branch road of Space Time Coding at random;
The said targeted customer who in transmit frame, does not correctly receive data receives the different propagation paths from different trunk subscribers, the data of different Space Time Coding branch, and these data are merged; Or oneself the data that targeted customer's own data that will directly receive from the base station and trunk subscriber forwarding come merge.
9. a multi-user radio relay system comprises, base station and user terminal, and described base station and user terminal link; It is characterized in that:
Described base station has the downlink data generation unit, is used to generate the downlink data that includes the channel quality information explore frame;
Described user terminal comprises:
The target user data memory cell is used for preserving according to one of following standard part targeted customer's data: the residing subcarrier of the part targeted customer's of reservation data in the decline of frequency selective fading channels less than preset threshold; Perhaps, at most only keep a top-quality G user's data, the decline that these data experienced simultaneously is less than pre-set threshold, and described G is predefined numerical value; Perhaps only keep the user's data that correctly to decode;
Targeted customer's selected cell; Be used for being received in pilot signal that does not comprise data or spreading code that different target user that transmit frame correctly do not receive data sends; And measure the channel quality information between itself and the said different target user, the selective channel quality information greater than the user of threshold value as the targeted customer;
The transmit diversity unit utilizes channel quality information that the data of transmitting are carried out Space Time Coding, and adopts the multiple-input, multiple-output multi-antenna technology to send, and each trunk subscriber is selected a branch road of Space Time Coding at random;
Merge cells is used to receive the data from base station and different trunk subscribers, and these data is merged.
10. system according to claim 9 is characterized in that, described downlink data comprises in proper order: transmit frame, channel quality information explore frame and transmitted frame separate with the time interval between frame and frame.
11. system according to claim 9 is characterized in that, described user terminal also comprises: the pilot signal transmitting element is used for pilot signal transmitted on sub-carrier positions.
12. system according to claim 9 is characterized in that, described user terminal also comprises: the spreading code transmitting element is used to send the spreading code of code division multiple access mode.
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| JP5038924B2 (en) * | 2008-01-25 | 2012-10-03 | 株式会社エヌ・ティ・ティ・ドコモ | Relay transmission system, base station, relay station and method |
| CN101635593B (en) * | 2008-07-25 | 2013-10-02 | 华为技术有限公司 | Method, device and system for realizing transmission of multicast broadcast service data |
| CN101873626B (en) * | 2009-04-27 | 2013-05-29 | 电信科学技术研究院 | Signal channel quality measuring method, system, base station, relay node and user equipment |
| KR101810688B1 (en) | 2011-08-03 | 2018-01-25 | 아주대학교산학협력단 | Terminal controlling cooperative transmission, and cooperative transmission control method thereof, in a communication system |
| CN104335636B (en) * | 2012-11-27 | 2019-04-19 | 华为技术有限公司 | Data transmission method and equipment and system |
| CN104219021A (en) * | 2013-05-31 | 2014-12-17 | 中兴通讯股份有限公司 | Downlink data transmission method, apparatus, and system for virtual multi-antenna system |
| SG11201605025UA (en) * | 2014-01-07 | 2016-08-30 | Huawei Tech Co Ltd | Method, apparatus, and system for collaborative communication between user equipments |
| JP7257274B2 (en) * | 2019-06-27 | 2023-04-13 | 本田技研工業株式会社 | Communication system, program, and information processing method |
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