CN106487433A - For transmitting device and the system of multiuser MIMO control information - Google Patents
For transmitting device and the system of multiuser MIMO control information Download PDFInfo
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- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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- H04B7/0452—Multi-user MIMO systems
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Abstract
The present invention proposes a kind of device for sending the multiuser MIMO control information of supercomposed coding, including：Signal generating unit, for adding the Data scheduling information of other UE at least two UE in the Downlink Control Information DCI of the UE being overlapped at least two user equipment (UE)s for encoding；Transmitting element, cyclic redundancy check information CRC for sending Downlink Control Information DCI, the DCI of each UE at least two UE are respectively adopted the specific identifier of each UE and are scrambled.Present invention achieves application of the supercomposed coding in LTE system, can lift the systematic function of existing MU MIMO, and less to prior art and protocol impact.
Description
Technical Field
The present invention relates to the field of wireless communication, and in particular, to an apparatus and system for transmitting multi-user MIMO control information.
Background
With the further evolution of LTE, the performance of MU-MIMO still has a large progress space. Even if the precoding of the transmitting end is not completely orthogonal, the performance of the MUMIMO system can be improved by simultaneously carrying out joint optimization from the transmitting end and the receiving end, such as adopting self-adaptive distribution of transmitting power and a CW-IC receiver, including the NOMA. One method is based on the Superposition Coding (SC) technique, which is a layered modulation technique, and the basic idea is that the system quantizes the channel state into different channel quality levels according to different target transmission rates, and each channel quantization level corresponds to a certain target transmission rate. A higher transmission rate for a good quality channel quantization level is called a near user, and a lower transmission rate for a poor quality channel quantization level is called a far user. And the two groups of signals are independently coded according to different target rates, mapped to corresponding constellation diagrams and then superposed. And when the far user receives the data, the data of the near user is regarded as noise and is directly processed. The near user firstly considers the signal as the noise to solve the far user data, then removes the far user signal from the received signal to solve the data, and can utilize the interference elimination of symbol level or the interference elimination of code word level.
The PDCCH bears uplink and Downlink Control Information (DCI), and PDCCH information of different users is distinguished through corresponding RNTI information, namely CRC of the DCI is scrambled by the RNTI.
Currently, the SI (RP-150496) of 3GPP new project studies the use of superposition coding to improve downlink multi-user MIMO performance in LTE systems. Since the near user needs to decode the far user data, the near user needs to know the C-RNTI and downlink control information of the far user, such as block length, modulation mode, HARQ process, etc., but how to obtain the above information, so that the near user does not discuss SIC operation.
Disclosure of Invention
In view of the above problem, the present invention provides an apparatus for transmitting superposition coded multi-user MIMO control information, comprising:
a generating unit, configured to add data scheduling information of other UEs in the at least two UEs to downlink control information DCI of a first UE in the at least two UEs performing superposition coding;
a sending unit, configured to send DCI to the at least two UEs, where Cyclic Redundancy Check (CRC) information of the DCI of each UE is scrambled by using a specific identifier of each UE.
Further, the sending unit is further configured to send a notification signaling to the first UE, where the notification signaling carries the specific identifier information of the other UEs, and the sending unit specifically includes:
a first sending subunit, configured to send a radio resource control, RRC, signaling to the first UE, where the RRC signaling carries the specific identifier of the other UE; or,
a second sending subunit, configured to send an RRC signaling to the first UE, where the RRC signaling carries a group of specific identifier lists including specific identifier information of the other UEs, and send DCI to the first UE, where the DCI includes index information of the specific identifiers of the other UEs.
Further, the apparatus further includes a scheduling unit, configured to determine at least two user equipments UEs performing superposition coding according to a scheduling algorithm, and specifically includes:
a first scheduling subunit, configured to select, according to channel state information of the UE, UEs with the same beamforming and precoding directions as the at least two UEs performing superposition coding; or,
and the second scheduling subunit is configured to select, according to the channel state information of the UE, the UE with the same beamforming and precoding directions and a maximum metric of the debugging algorithm as the at least two UEs performing superposition coding.
Further, the DCI transmitted by the transmitting unit to the first UE includes:
power ratio information of the at least two UEs, modulation/coding modes and RV version information of the other UEs; or
The power ratio information of the at least two UEs, the modulation/coding modes of the other UEs, the RV version information, the new data indications of the other UEs, and the HARQ process numbers of the other UEs.
The present invention also provides an apparatus for receiving superposition coded multi-user MIMO control information, comprising:
a receiving unit, configured to blind-check a physical downlink control channel PDCCH using a specific identifier of the UE;
the receiving unit is further configured to receive downlink control information DCI sent by the base station, and acquire data scheduling information of other UEs in the at least two UEs performing superposition coding included in the DCI.
Further, the receiving unit is further configured to receive a notification signaling sent by the base station, and acquire the specific identifier information of the other UEs carried in the notification signaling, which specifically includes:
a first receiving subunit, configured to receive a radio resource control RRC signaling sent by the base station, and acquire a specific identifier of the other UE carried in the RRC signaling; or,
a second receiving subunit, configured to receive an RRC signaling sent by the base station, where the RRC signaling carries a group of specific identifier lists including specific identifier information of the other UEs, receive DCI sent by the base station using a specific identifier of the UE, and obtain index information of the specific identifiers of the other UEs included in the DCI, so as to finally obtain the specific identifiers of the other UEs.
Further, the apparatus further comprises:
a demodulation unit, configured to receive user data of the other UEs on a PDSCH (physical downlink shared channel) by using the specific identifiers and the data scheduling information of the other UEs; and removing the user data of the other UE from the total received signal to obtain the user data of the UE.
Further, the DCI received by the receiving unit includes:
power ratio information of the at least two UEs, modulation/coding modes and RV version information of the other UEs; or
The power ratio information of the at least two UEs, the modulation/coding modes of the other UEs, the RV version information, the new data indications of the other UEs, and the HARQ process numbers of the other UEs.
Finally, the present invention also proposes a system for transmitting superposition coded multi-user MIMO control information, said system comprising a base station and at least two user equipments, UEs, said base station comprising a transmitting apparatus as defined in any of the above, said UEs comprising a receiving apparatus as defined in any of the above.
The method of the invention enables the near user to obtain the downlink control information of the far user, carries out interference elimination and finally solves the own data information, realizes the application of superposition coding in an LTE system, can improve the system performance of the existing MU-MIMO, and has little influence on the prior art and the protocol.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below.
One embodiment of the present invention provides an apparatus for transmitting superposition coded multi-user MIMO control information, comprising:
a generating unit, configured to add data scheduling information of other UEs in the at least two UEs to downlink control information DCI of a first UE in the at least two UEs performing superposition coding;
a sending unit, configured to send DCI to the at least two UEs, where Cyclic Redundancy Check (CRC) information of the DCI of each UE is scrambled by using a specific identifier of each UE.
In an optional embodiment, the sending unit is further configured to send a notification signaling to the first UE, where the notification signaling carries specific identification information of the other UEs, and the sending unit specifically includes:
a first sending subunit, configured to send a radio resource control, RRC, signaling to the first UE, where the RRC signaling carries the specific identifier of the other UE; or,
a second sending subunit, configured to send an RRC signaling to the first UE, where the RRC signaling carries a group of specific identifier lists including specific identifier information of the other UEs, and send DCI to the first UE, where the DCI includes index information of the specific identifiers of the other UEs.
In an optional embodiment, the apparatus further includes a scheduling unit, configured to determine at least two user equipments UEs performing superposition coding according to a scheduling algorithm, specifically including:
a first scheduling subunit, configured to select, according to channel state information of the UE, UEs with the same beamforming and precoding directions as the at least two UEs performing superposition coding; or,
and the second scheduling subunit is configured to select, according to the channel state information of the UE, the UE with the same beamforming and precoding directions and a maximum metric of the debugging algorithm as the at least two UEs performing superposition coding.
In an optional embodiment, the DCI transmitted by the transmitting unit to the first UE includes:
power ratio information of the at least two UEs, modulation/coding modes and RV version information of the other UEs; or
The power ratio information of the at least two UEs, the modulation/coding modes of the other UEs, the RV version information, the new data indications of the other UEs, and the HARQ process numbers of the other UEs.
An embodiment of the present invention further provides an apparatus for receiving superposition coded multi-user MIMO control information, including:
a receiving unit, configured to blind-check a physical downlink control channel PDCCH using a specific identifier of the UE;
the receiving unit is further configured to receive downlink control information DCI sent by the base station, and acquire data scheduling information of other UEs in the at least two UEs performing superposition coding included in the DCI.
In an optional embodiment, the receiving unit is further configured to receive a notification signaling sent by the base station, and acquire the specific identifier information of the other UEs carried in the notification signaling, where the specific identifier information specifically includes:
a first receiving subunit, configured to receive a radio resource control RRC signaling sent by the base station, and acquire a specific identifier of the other UE carried in the RRC signaling; or,
a second receiving subunit, configured to receive an RRC signaling sent by the base station, where the RRC signaling carries a group of specific identifier lists including specific identifier information of the other UEs, receive DCI sent by the base station using a specific identifier of the UE, and obtain index information of the specific identifiers of the other UEs included in the DCI, so as to finally obtain the specific identifiers of the other UEs.
In an optional embodiment, the apparatus further comprises:
a demodulation unit, configured to receive user data of the other UEs on a PDSCH (physical downlink shared channel) by using the specific identifiers and the data scheduling information of the other UEs; and removing the user data of the other UE from the total received signal to obtain the user data of the UE.
In an optional embodiment, the DCI received by the receiving unit includes:
power ratio information of the at least two UEs, modulation/coding modes and RV version information of the other UEs; or
The power ratio information of the at least two UEs, the modulation/coding modes of the other UEs, the RV version information, the new data indications of the other UEs, and the HARQ process numbers of the other UEs.
An embodiment of the present invention further provides a system for transmitting superposition coded multi-user MIMO control information, the system comprising a base station and at least two user equipments, UEs, the base station comprising the transmitting apparatus as described in any of the above, and the UEs comprising the receiving apparatus as described in any of the above.
Example 1
In this embodiment, the base station adds the control information of the far user to the downlink control information of the near user and sends the control information to the near user, the near user blindly detects the PDCCH, resolves the DCI, obtains the data scheduling information of the far user from the DCI, and then obtains the PDSCH information of the near user by using the interference cancellation technology.
A base station side:
determining a near user and a far user for superposition coding according to a scheduling algorithm, wherein the determination criterion comprises the following steps: the beamforming and precoding directions are the same, and the conditions can be added: maximizing the metric of the debugging algorithm;
sending a notification signaling carrying a far user C-RNTI to a near user, wherein the notification signaling can be RRC signaling (see embodiment 2) or RRC signaling + DCI (see embodiment 3);
adding data scheduling information of a far user to downlink control information of a near user;
the DCI for sending the downlink control information DCI may include contents such as power allocation and far user scheduling information (see embodiment 4 and embodiment 5).
The UE side:
using the C-RNTI of the UE to blindly detect the PDCCH;
obtaining far user data scheduling information contained in DCI;
receiving a notification signaling carrying a remote user C-RNTI;
and receiving the remote user data by using the remote user C-RNTI and the data scheduling information, and removing the remote user data from the total received signal to obtain the user data.
Example 2: remote user C-RNTI distribution and reception through RRC signaling
For the UE in the connected state, the eNB determines, according to the channel state information, a remote user that can adopt superposition coding pairing, and the criterion for the determination is: the beamforming/precoding directions are the same, and the user with the maximum metric (such as the total downlink rate) of the debugging algorithm is used as the far user of the UE;
the UE obtains the remote user C-RNTI issued by the base station through the RRC connection reconfiguration message, namely, a remote user C-RNTI field is added in the RRC connection reconfiguration message, and the length is 16 bits;
after obtaining the C-RNTI of the remote user, the UE can be used for solving the data of the remote user, so that the data interference of the remote user is removed from the total received signals, and the downlink PDSCH of the UE is obtained.
Example 3: and the base station informs a group of remote user C-RNTI information lists to the near user through the RRC connection reconfiguration message, and then dynamically issues the currently superposed remote user C-RNTI indexes through DCI carried by the PDCCH. The method specifically comprises the following steps:
for the UE in a connected state, the eNB determines a plurality of remote user groups which can adopt superposition coding pairing according to the channel state information of the eNB; the judgment criterion is as follows: users with the same beamforming/precoding direction are selected as the far user candidate group for this UE.
The UE obtains a C-RNTI list of a remote user candidate group through the RRC connection reconfiguration message, namely, a group of remote user C-RNTI lists are added in the RRC connection reconfiguration message, and the length of each C-RNTI is 16 bits.
After the UE obtains a remote user C-RNTI list, each time the eNB carries out downlink data scheduling, one or more remote user C-RNTI indexes which are overlapped and coded with the UE are indicated by the PDCCH, and the UE obtains the C-RNTI of the remote user from the list according to the indexes; the UE can use the C-RNTI to blindly detect the downlink control information of the remote user so as to demodulate the data of the remote user, and finally the downlink PDSCH of the UE is obtained after interference elimination processing.
Example 4: the far user only adopts superposition coding for initial transmission, and the downlink control information DCI of the near user may include the following information:
power ratio of far user and near user
Modulation and coding mode of far user, 5bit represents
RV version, 1bit representation
Example 5: the far-user initial transmission retransmission adopts superposition coding, and the near-user downlink control information DCI may include the following information:
power ratio of far user and near user
Modulation and coding mode of far user, 5bit represents
RV version, 1bit representation
New data indication for remote users
Remote user HARQ process number
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An apparatus for transmitting superposition coded multi-user MIMO control information, comprising:
a generating unit, configured to add data scheduling information of other UEs in the at least two UEs to downlink control information DCI of a first UE in the at least two UEs performing superposition coding;
a sending unit, configured to send DCI to the at least two UEs, where Cyclic Redundancy Check (CRC) information of the DCI of each UE is scrambled by using a specific identifier of each UE.
2. The apparatus according to claim 1, wherein the sending unit is further configured to send a notification signaling to the first UE, where the notification signaling carries specific identification information of the other UEs, and specifically includes:
a first sending subunit, configured to send a radio resource control, RRC, signaling to the first UE, where the RRC signaling carries the specific identifier of the other UE; or,
a second sending subunit, configured to send an RRC signaling to the first UE, where the RRC signaling carries a group of specific identifier lists including specific identifier information of the other UEs, and send DCI to the first UE, where the DCI includes index information of the specific identifiers of the other UEs.
3. The apparatus according to claim 1, wherein the apparatus further includes a scheduling unit, configured to determine at least two UEs performing superposition coding according to a scheduling algorithm, and specifically includes:
a first scheduling subunit, configured to select, according to channel state information of the UE, UEs with the same beamforming and precoding directions as the at least two UEs performing superposition coding; or,
and the second scheduling subunit is configured to select, according to the channel state information of the UE, the UE with the same beamforming and precoding directions and a maximum metric of the debugging algorithm as the at least two UEs performing superposition coding.
4. The apparatus according to claim 1, wherein the DCI transmitted by the transmitting unit to the first UE includes:
power ratio information of the at least two UEs, modulation/coding modes and RV version information of the other UEs; or
The power ratio information of the at least two UEs, the modulation/coding modes of the other UEs, the RV version information, the new data indications of the other UEs, and the HARQ process numbers of the other UEs.
5. An apparatus for receiving superposition coded multi-user MIMO control information, comprising:
a receiving unit, configured to blind-check a physical downlink control channel PDCCH using a specific identifier of the UE;
the receiving unit is further configured to receive downlink control information DCI sent by the base station, and acquire data scheduling information of other UEs in the at least two UEs performing superposition coding included in the DCI.
6. The apparatus according to claim 5, wherein the receiving unit is further configured to receive a notification signaling sent by a base station, and acquire the specific identifier information of the other UEs carried in the notification signaling, specifically including:
a first receiving subunit, configured to receive a radio resource control RRC signaling sent by the base station, and acquire a specific identifier of the other UE carried in the RRC signaling; or,
a second receiving subunit, configured to receive an RRC signaling sent by the base station, where the RRC signaling carries a group of specific identifier lists including specific identifier information of the other UEs, receive DCI sent by the base station using a specific identifier of the UE, and obtain index information of the specific identifiers of the other UEs included in the DCI, so as to finally obtain the specific identifiers of the other UEs.
7. The apparatus of claim 5, further comprising:
a demodulation unit, configured to receive user data of the other UEs on a PDSCH (physical downlink shared channel) by using the specific identifiers and the data scheduling information of the other UEs; and removing the user data of the other UE from the total received signal to obtain the user data of the UE.
8. The apparatus of claim 5, wherein the DCI received by the receiving unit comprises:
power ratio information of the at least two UEs, modulation/coding modes and RV version information of the other UEs; or
The power ratio information of the at least two UEs, the modulation/coding modes of the other UEs, the RV version information, the new data indications of the other UEs, and the HARQ process numbers of the other UEs.
9. A system for transmitting superposition coded multi-user MIMO control information, the system comprising a base station and at least two user equipments, UEs, the base station comprising an apparatus according to any of claims 1 to 4 and the UEs comprising an apparatus according to any of claims 5 to 8.
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Cited By (1)
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| CN111972024A (en) * | 2018-08-10 | 2020-11-20 | Oppo广东移动通信有限公司 | Channel state information reporting method, terminal equipment and network equipment |
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