CN102215095A - Data retransmission control method and system - Google Patents
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Abstract
The invention discloses a data retransmission control method and a data retransmission control system. The data retransmission control method comprises the following steps of: dividing users into at least two user groups according to communication quality, and selecting one user from each user group for user pairing; transmitting the user data of the paired users by using a transmitter, and receiving the user data of the paired users by using a receiver; determining the data of all the paired users is required to be retransmitted in combination with the data checking operation of the receiver when the user data of high-communication quality users in the paired users has errors; and determining the user data of low-communication quality users is required to be retransmitted when the user data of the low-communication quality users in the paired users has the errors. By the method and the system, a data retransmission mechanism in a multi-user multiple input and multiple output system is provided, the communication accuracy of the multi-user multiple input and multiple output system can be improved, and the degree of satisfaction of the user can be improved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and system for implementing data retransmission control.
Background
A Multiple Input and Multiple Output (MIMO) system is a technology of interest in the research of LTE due to its effective improvement of channel capacity. In addition, the MIMO system uses the precoding technology to multiplex multiple data streams and antennas, so that the existing channel resources can be more effectively utilized; in addition, the system capacity can be improved through the power distribution of the data streams, the interference among the data streams can be reduced, and the overall performance of the system can be improved.
The basic idea of the precoding method for multi-user use is: the transmitter at the transmitting end knows the channel information of all users, so that the signals among multiple users can be separated by a multi-user signal separation algorithm according to the channel information of all users, the interference among the users is eliminated, and the purpose of simultaneously transmitting the multi-user signals at the same frequency is achieved.
In a multi-user MIMO system, signals of multiple users can be separated by designing appropriate weight vectors of transmitting antennas and receiving antennas, and interference is removed. Also, a Time Division Duplex (TDD) scheme can be used since channel information can be obtained using channel reciprocity.
The characteristics enable the multi-user MIMO system to have a wide development prospect, but a data retransmission mechanism does not exist in the current multi-user MIMO system, so that the method is not beneficial to the users to develop accurate and efficient communication services, and does not utilize the performance of the multi-user MIMO system and the improvement of the user satisfaction.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method and a system for implementing data retransmission control, so as to improve communication accuracy and user satisfaction.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for implementing data retransmission control, the method comprising:
dividing users into at least two user groups according to the communication quality, and selecting one user from each user group for user pairing;
a transmitting end transmits user data of a paired user, and a receiving end receives the user data of the paired user;
combining with the data verification operation of a receiving end, when the user data of the high communication quality user in the paired users is wrong, determining that the data of all the paired users need to be retransmitted; when the user data of the low communication quality user in the paired users is wrong, determining that the user data of the low communication quality user needs to be retransmitted.
The method for dividing the user group comprises the following steps:
the users are divided into two groups according to the channel condition of the users and the service quality of the users.
In the two groups of divided users, the received signal-to-noise ratio of the first group of users is higher than that of the second group of users; the user pairing method comprises the following steps:
selecting a user with a relatively good channel from the first group of users according to the service priority, and taking the user as a first user; respectively calculating the spatial correlation degree between each user to be scheduled and the first user in the second group of users, selecting one user of which the calculation result is lower than a spatial correlation degree threshold value, and taking the user as a second user; and taking the first user and the second user as paired users.
The data checking process comprises the following steps:
and carrying out data verification on the user data of the first user, and carrying out data verification on the user data of the second user only when the verification is correct.
The data verification method comprises the following steps:
and detecting the user data of the paired users by using a data detection method, and then performing Cyclic Redundancy Check (CRC) processing on the detected user data.
The high communication quality user is the first user in a first divided group of users, the low communication quality user is the second user in a second divided group of users, and the paired users include the first user and the second user.
The process of transmitting the user data of the paired user by the transmitting terminal comprises the following steps:
the transmitting terminal obtains a downlink channel matrix of the paired users by using channel reciprocity, calculates a transmitting terminal weight of the paired users according to the downlink channel matrix of the paired users, and performs weighted transmission on user data of the paired users by using the obtained transmitting terminal weight;
the transmitting terminal also feeds back the transmitting terminal weight of the paired users to corresponding users in the paired users respectively;
the process of receiving the user data of the paired user by the receiving end includes:
the receiving end decodes the received user data by using the received corresponding transmitting end weight.
A system for realizing data retransmission control comprises a user pairing unit, a data verification unit and a retransmission decision unit; wherein,
the user pairing unit is used for dividing users into at least two user groups according to the communication quality, selecting one user from each user group for user pairing, and informing the transmitting side communication unit of the specific pairing condition;
the data checking unit is used for checking the received user data of the paired users and informing the checking result to the retransmission decision unit;
the retransmission decision unit is used for determining that the data of all the paired users need to be retransmitted when the user data of the high communication quality user in the paired users is wrong according to the received check result; when the user data of the low communication quality user in the paired users is wrong, determining that the user data of the low communication quality user needs to be retransmitted.
The user groups are divided according to the channel condition of the users and the service quality of the users, and the number of the user groups is two; in the two divided groups of users, the received signal-to-noise ratio of the first group of users is higher than that of the second group of users.
Further comprises a transmitting side communication unit and a receiving side communication unit; wherein,
the transmitting side communication unit is used for supporting communication between the user pairing unit and the receiving end; the method is further used for calculating and feeding back the weight value of the transmitting terminal aiming at the downlink communication;
and the receiving side communication unit is used for supporting the communication between the data verification unit and the transmitting end.
The user pairing unit is arranged at the transmitting end, and the data verification unit and the retransmission decision unit are arranged at the receiving end.
Therefore, the method and the system of the invention provide a data retransmission mechanism in the multi-user MIMO system, can improve the communication accuracy in the multi-user MIMO system and improve the user satisfaction.
Drawings
Fig. 1 is a schematic diagram illustrating the operation of downlink multi-user MIMO in TDD mode;
FIG. 2 is a schematic diagram illustrating a user pairing principle according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a data retransmission strategy according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a retransmission principle when user data of a user with low communication quality is in error according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a retransmission principle when user data of a high communication quality user is in error according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating an embodiment of a method for implementing data retransmission control;
fig. 7 is a system diagram for implementing data retransmission control according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic diagram illustrating operation of downlink multi-user MIMO in TDD mode. In fig. 1, two users are taken as an example, and in practical applications, multiple users may be used. In fig. 1, the transmitting end may perform uplink channel estimation according to the TDD channel reciprocity to obtain downlink channel matrices of two users, and may calculate transmitting end weights of the two users according to the downlink channel matrices of the two users, and then perform weighted transmission on corresponding user data by using the obtained transmitting end weights.
In addition, in order to ensure that the receiving end can perform correct subsequent processing on the received user data, the transmitting end respectively feeds back the weight values of the transmitting ends of the two users to the corresponding users.
It should be noted that, in the multi-user MIMO mode, signals of multiple users can be separated by designing appropriate weight vectors of transmit antennas and receive antennas, so as to remove interference. The algorithm for separating the user signal and removing the interference is as follows: bd (block diagonalize) algorithm, matrix inversion method, ZF (zero-forcing) algorithm, Vector ZF algorithm.
The BD algorithm is described as follows:
definition ofWherein H1…HKWhich are the channel matrices of K users, respectively.
For the
Performing SVD to obtain
Wherein
Is that
The first column vector of the decomposed V matrix,
is that
The remaining column vectors obtained are decomposed.
For the jth user, the matrix
Is applicable;
for the jth user, the weight vector used at the transmitting end is
The weight value used at the receiving end is Uj。
In general, the dimension requirement of the BD algorithm is that the number of transmit antennas is not less than the sum of the number of K-1 user receive antennas. When this condition is met, the BD algorithm can eliminate inter-user interference, i.e. ideally separate the inter-user signals.
The Vector ZF algorithm is described as follows:
for a multi-user MIMO system with K users, the channel matrixes are respectively H1，…，HKFor each user, do the operation [ Uj，Dj，Vj]＝svd(Hj) (ii) a Let UHj＝(Uj H*Hj)T(ii) a Wherein, UHjCorresponding to (D)j*Vj H)T，DjIs a characteristic value arranged from large to small,Vjis an effective precoding weight vector. To reduce feedback overhead, the entire UH may not be performedjFeedback of the matrix, but only UH for each userjFirst N of the matrixSA column vector of NSNumber of ranks, H, used for each userMU＝[UH1(:，1:NS)…UHj(:，1:NS)…UHK(:，1:NS)]TThe weight vector W is pinv (H)MU)，UjAs the precoding weight of the receiving end of the jth user.
The performance constraints of the various algorithms described above are as follows:
1. BD algorithm
The BD algorithm completely eliminates the interference between users on the premise that:
NRX*(K-1)≤NTXwherein N isRXThe number of receiving antennas at the receiving end, K is the number of users, NTXThe number of transmit antennas at the transmitting end.
2. Matrix inversion algorithm
The premise that the matrix inversion algorithm completely eliminates the interference between users and the interference between streams is as follows:
NRX*K≤NTXand N isS≤NRXWherein N isRXNumber of receiving antennas for transmitting end, NSThe number of ranks used by each user, K being the number of users, NTXThe number of transmit antennas at the receiving end.
3. ZF algorithm
The precondition for the ZF algorithm to completely eliminate the inter-user interference and the inter-stream interference is:
NRX*K≤NTXand N isS≤NRXWherein N isRXFor the number of receiving antennas at the receiving end, NSThe number of ranks used by each user, K being the number of users, NTXTo launchNumber of transmit antennas at the end.
4. Vector ZF algorithm
The precondition that the Vector ZF algorithm completely eliminates the interference between users and the interference between streams is as follows:
NRX*K≤NTXand N isS≤NRXWherein N isRXFor the number of receiving antennas at the receiving end, NSThe number of ranks used by each user, K being the number of users, NTXThe number of transmit antennas at the transmitting end.
In order to implement data retransmission control, users may be first divided into two or more user groups according to communication quality, and users may be selected from each user group for user pairing.
In particular, the manner shown in fig. 2 may be applied to group users. Referring to fig. 2, fig. 2 is a schematic diagram illustrating a user pairing principle according to an embodiment of the present invention. In fig. 2, users may be classified into different classes according to quality of service (QoS) requirements or service queue lengths of different users, and each class corresponds to a service priority of a user. A user with a high priority QoS requirement corresponds to a high service priority if the QoS parameters are taken into account.
When the users in the system are paired, the users can be firstly divided into two groups according to the channel condition of the users and the service quality of the users, the users with the receiving signal-to-noise ratio higher than the signal-to-noise ratio threshold value can be classified into a first group in operation, and the users with the receiving signal-to-noise ratio lower than the signal-to-noise ratio threshold value can be classified into a second group. Of course, in practical applications, more than two groups of user groups may be divided, as long as the following user pairing and determination of whether to retransmit the user data can be successfully achieved. In the following, only two user groups are described as an example.
Each time pairing is performed, one user can be taken from the two groups respectively, and the received signal-to-noise ratio of the first group of users is higher than that of the second group of users. Selecting a user from the first group according to the service priority, wherein the user is a user with a better channel and is represented by a user i, and the user can also be called a first user in a paired user; and respectively calculating the spatial correlation degree between each user to be scheduled and the user i in the second group, and sequencing according to the spatial correlation degrees of the users, wherein one user lower than a spatial correlation degree threshold value is selected, and the user selected from the second group is a user with a poor channel and is represented by a user j, and can also be called a second user in the paired users. Generally, each pairing process needs to select one user from the first group and the second group respectively for pairing.
In practical application, the above operations can be repeated until the user selects and pairs.
After the user pairing is completed, the transmitting terminal can obtain downlink channel matrixes of the two users by using channel reciprocity, calculate the transmitting terminal weights of the two users according to the downlink channel matrixes of the two users, and then perform weighted transmission on user data of the two users by using the obtained transmitting terminal weights. In addition, the transmitting terminal can also respectively feed back the transmitting terminal weights of the two users to the corresponding users by using a codebook and other modes.
The receiving end can receive user data of a user i and a user j from the transmitting end, decode the received user data by applying the received corresponding weight of the transmitting end, detect the user data of the paired user by using a data detection method such as a Serial Interference Cancellation (SIC) algorithm and/or a Minimum Mean Square Error (MMSE) algorithm and the like, and perform Cyclic Redundancy Check (CRC) processing on the detected user data to determine whether the user data of the paired user needs to be retransmitted or not. In general, the correctness of the user data of user i has an influence on the correctness of the user data of user j, so the user data of user i needs to be checked first. Of course, if the received user data needs to be precoded, the receiving end may obtain the channel matrix H through channel estimation, and perform SVD decomposition on the channel matrix H to obtain the precoding matrix U of the receiving endiReuse UiAnd carrying out receiving end precoding.
When actually performing the user data check and the subsequent retransmission decision, the operation principle as shown in fig. 3 may be followed. Referring to fig. 3, fig. 3 is a schematic diagram of a data retransmission strategy according to an embodiment of the present invention. As shown in fig. 3, CRC processing is performed on the user data of user i, and when the user data of user i is checked for errors, the user data of user i and user j need to be retransmitted. When the user data of the user i is checked correctly, performing CRC processing on the user data of the user j, and when the user data of the user j is checked correctly, the user data of the user i and the user j does not need to be retransmitted, but new user data can be continuously sent to the user i and the user j; when the user data of the user j is checked to be wrong, the user data of the user j needs to be retransmitted, the user data of the user i does not need to be retransmitted, and new user data can be continuously sent to the user i.
Currently, there are various ways to implement retransmission, such as: the receiving end informs the transmitting end to retransmit the user data in a response mode and the like. In addition, the retransmitted user data usually occupies one subframe in the next transmission slot.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a retransmission principle when user data of a user with low communication quality is in error according to an embodiment of the present invention. As can be seen from fig. 4, when the user data of user i is checked correctly but the user data of user j is checked incorrectly, the user data of user j needs to be retransmitted, and the user data of user i does not need to be retransmitted, so that new user data can be continuously sent to user i.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating a retransmission principle when user data of a high communication quality user is in error according to an embodiment of the present invention. As can be seen from fig. 5, when the user data of user i is checked to be erroneous, the user data of user i and user j needs to be retransmitted.
As can be seen from the above, the operation concept for implementing data retransmission control can be represented as shown in fig. 6. Referring to fig. 6, fig. 6 is a flowchart of implementing data retransmission control according to an embodiment of the present invention, where the flowchart includes the following steps:
step 610: and dividing the users into more than two user groups according to the communication quality, and selecting the users from the user groups for user pairing.
Step 620: the transmitting end transmits user data of paired users, and the receiving end receives the user data of the paired users.
Step 630: in combination with the data verification operation of the receiving end, when the user data of the high communication quality user in the paired users is wrong, the data of all the paired users are requested to be retransmitted; and when the user data of the low communication quality user in the paired users is wrong, requesting to retransmit the user data of the low communication quality user.
In order to ensure that the above operation can be smoothly performed, an arrangement as shown in fig. 7 may be performed. Referring to fig. 7, fig. 7 is a diagram of a system for implementing data retransmission control according to an embodiment of the present invention, where the system includes a transmitting end and a receiving end that can implement wireless connection. The transmitting terminal comprises a user pairing unit and a transmitting side communication unit which are connected; the receiving end comprises a receiving side communication unit, a data checking unit and a retransmission decision unit which are connected.
In specific application, the user pairing unit can realize grouping and pairing of users, notify the transmitting side communication unit of specific pairing conditions, and transmit user data of paired users by the transmitting side communication unit. In addition to supporting communication between the user pairing unit and the receiving end, the above-described processing relating to calculation of the weight value of the transmitting end, feedback, and the like may be performed by the transmitting-side communication unit.
The receiving side communication unit can receive the user data of the paired users from the transmitting end and send the received user data to the data verification unit. In addition to supporting communication between the data check unit and the transmitting end, the processing described above relating to precoding and the like may be performed by the receiving-side communication unit.
The data checking unit performs data detection, CRC processing and other processing on the received user data of the paired users, and the processing principle follows the content shown in fig. 3; and, the data checking unit will inform the checking result to the retransmission decision unit, and the retransmission decision unit determines the specific retransmission policy according to the principle shown in fig. 3. In addition, for the user data that is determined to need retransmission, the retransmission decision unit may also request the transmitting end to retransmit the user data.
In summary, the technology for realizing data retransmission control of the invention provides a data retransmission mechanism in a multi-user MIMO system, and can improve the communication accuracy in the multi-user MIMO system and the user satisfaction degree, regardless of the method or the system.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (11)
1. A method for implementing data retransmission control, the method comprising:
dividing users into at least two user groups according to the communication quality, and selecting one user from each user group for user pairing;
a transmitting end transmits user data of a paired user, and a receiving end receives the user data of the paired user;
combining with the data verification operation of a receiving end, when the user data of the high communication quality user in the paired users is wrong, determining that the data of all the paired users need to be retransmitted; when the user data of the low communication quality user in the paired users is wrong, determining that the user data of the low communication quality user needs to be retransmitted.
2. The method of claim 1, wherein the user group is divided by:
the users are divided into two groups according to the channel condition of the users and the service quality of the users.
3. The method of claim 2 wherein the two groups of users are divided such that the first group of users has a higher received signal-to-noise ratio than the second group of users; the user pairing method comprises the following steps:
selecting a user with a relatively good channel from the first group of users according to the service priority, and taking the user as a first user; respectively calculating the spatial correlation degree between each user to be scheduled and the first user in the second group of users, selecting one user of which the calculation result is lower than a spatial correlation degree threshold value, and taking the user as a second user; and taking the first user and the second user as paired users.
4. The method of claim 3, wherein the data checking comprises:
and carrying out data verification on the user data of the first user, and carrying out data verification on the user data of the second user only when the verification is correct.
5. The method according to any one of claims 1 to 4, wherein the data verification method comprises:
and detecting the user data of the paired users by using a data detection method, and then performing Cyclic Redundancy Check (CRC) processing on the detected user data.
6. The method according to any one of claims 2 to 4, wherein said high communication quality user is said first user in a first divided group of users, said low communication quality user is said second user in a second divided group of users, and said paired users include said first user and said second user.
7. The method according to any one of claims 1 to 4, wherein the process of transmitting the user data of the paired user at the transmitting end comprises:
the transmitting terminal obtains a downlink channel matrix of the paired users by using channel reciprocity, calculates a transmitting terminal weight of the paired users according to the downlink channel matrix of the paired users, and performs weighted transmission on user data of the paired users by using the obtained transmitting terminal weight;
the transmitting terminal also feeds back the transmitting terminal weight of the paired users to corresponding users in the paired users respectively;
the process of receiving the user data of the paired user by the receiving end includes:
the receiving end decodes the received user data by using the received corresponding transmitting end weight.
8. A system for realizing data retransmission control is characterized by comprising a user pairing unit, a data verification unit and a retransmission decision unit; wherein,
the user pairing unit is used for dividing users into at least two user groups according to the communication quality, selecting one user from each user group for user pairing, and informing the transmitting side communication unit of the specific pairing condition;
the data checking unit is used for checking the received user data of the paired users and informing the checking result to the retransmission decision unit;
the retransmission decision unit is used for determining that the data of all the paired users need to be retransmitted when the user data of the high communication quality user in the paired users is wrong according to the received check result; when the user data of the low communication quality user in the paired users is wrong, determining that the user data of the low communication quality user needs to be retransmitted.
9. The system of claim 8, wherein the user groups are divided into two according to the channel condition of the users and the service quality of the users; in the two divided groups of users, the received signal-to-noise ratio of the first group of users is higher than that of the second group of users.
10. The system according to claim 8 or 9, further comprising a transmitting side communication unit, a receiving side communication unit; wherein,
the transmitting side communication unit is used for supporting communication between the user pairing unit and the receiving end; the method is further used for calculating and feeding back the weight value of the transmitting terminal aiming at the downlink communication;
and the receiving side communication unit is used for supporting the communication between the data verification unit and the transmitting end.
11. The system according to claim 8 or 9, wherein the user pairing unit is disposed at a transmitting end, and the data checking unit and the retransmission decision unit are disposed at a receiving end.
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| CN102611541A (en) * | 2011-12-26 | 2012-07-25 | 中兴通讯股份有限公司 | Data retransmission method and data retransmission device under unbalanced antenna gain |
| US9042485B2 (en) | 2011-12-26 | 2015-05-26 | Zte Corporation | Method and device for retransmitting data under antenna gain imbalance |
| CN102611541B (en) * | 2011-12-26 | 2017-05-03 | 中兴通讯股份有限公司 | Data retransmission method and data retransmission device under unbalanced antenna gain |
| CN103401666A (en) * | 2013-06-29 | 2013-11-20 | 华为技术有限公司 | Method and device for data retransmission |
| CN104683073A (en) * | 2013-11-26 | 2015-06-03 | 联芯科技有限公司 | A decoding method and receiving set |
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| WO2011124040A1 (en) | 2011-10-13 |
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